--- /dev/null
+EXTRA_CFLAGS += -Ifs/ocfs2
+
+obj-$(CONFIG_OCFS2_FS) += ocfs2_dlm.o
+
+ocfs2_dlm-objs := dlmdomain.o dlmdebug.o dlmthread.o dlmrecovery.o \
+ dlmmaster.o dlmast.o dlmconvert.o dlmlock.o dlmunlock.o dlmver.o
--- /dev/null
+/* -*- mode: c; c-basic-offset: 8; -*-
+ * vim: noexpandtab sw=8 ts=8 sts=0:
+ *
+ * dlmapi.h
+ *
+ * externally exported dlm interfaces
+ *
+ * Copyright (C) 2004 Oracle. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ *
+ */
+
+#ifndef DLMAPI_H
+#define DLMAPI_H
+
+struct dlm_lock;
+struct dlm_ctxt;
+
+/* NOTE: changes made to this enum should be reflected in dlmdebug.c */
+enum dlm_status {
+ DLM_NORMAL = 0, /* 0: request in progress */
+ DLM_GRANTED, /* 1: request granted */
+ DLM_DENIED, /* 2: request denied */
+ DLM_DENIED_NOLOCKS, /* 3: request denied, out of system resources */
+ DLM_WORKING, /* 4: async request in progress */
+ DLM_BLOCKED, /* 5: lock request blocked */
+ DLM_BLOCKED_ORPHAN, /* 6: lock request blocked by a orphan lock*/
+ DLM_DENIED_GRACE_PERIOD, /* 7: topological change in progress */
+ DLM_SYSERR, /* 8: system error */
+ DLM_NOSUPPORT, /* 9: unsupported */
+ DLM_CANCELGRANT, /* 10: can't cancel convert: already granted */
+ DLM_IVLOCKID, /* 11: bad lockid */
+ DLM_SYNC, /* 12: synchronous request granted */
+ DLM_BADTYPE, /* 13: bad resource type */
+ DLM_BADRESOURCE, /* 14: bad resource handle */
+ DLM_MAXHANDLES, /* 15: no more resource handles */
+ DLM_NOCLINFO, /* 16: can't contact cluster manager */
+ DLM_NOLOCKMGR, /* 17: can't contact lock manager */
+ DLM_NOPURGED, /* 18: can't contact purge daemon */
+ DLM_BADARGS, /* 19: bad api args */
+ DLM_VOID, /* 20: no status */
+ DLM_NOTQUEUED, /* 21: NOQUEUE was specified and request failed */
+ DLM_IVBUFLEN, /* 22: invalid resource name length */
+ DLM_CVTUNGRANT, /* 23: attempted to convert ungranted lock */
+ DLM_BADPARAM, /* 24: invalid lock mode specified */
+ DLM_VALNOTVALID, /* 25: value block has been invalidated */
+ DLM_REJECTED, /* 26: request rejected, unrecognized client */
+ DLM_ABORT, /* 27: blocked lock request cancelled */
+ DLM_CANCEL, /* 28: conversion request cancelled */
+ DLM_IVRESHANDLE, /* 29: invalid resource handle */
+ DLM_DEADLOCK, /* 30: deadlock recovery refused this request */
+ DLM_DENIED_NOASTS, /* 31: failed to allocate AST */
+ DLM_FORWARD, /* 32: request must wait for primary's response */
+ DLM_TIMEOUT, /* 33: timeout value for lock has expired */
+ DLM_IVGROUPID, /* 34: invalid group specification */
+ DLM_VERS_CONFLICT, /* 35: version conflicts prevent request handling */
+ DLM_BAD_DEVICE_PATH, /* 36: Locks device does not exist or path wrong */
+ DLM_NO_DEVICE_PERMISSION, /* 37: Client has insufficient pers for device */
+ DLM_NO_CONTROL_DEVICE, /* 38: Cannot set options on opened device */
+
+ DLM_RECOVERING, /* 39: extension, allows caller to fail a lock
+ request if it is being recovered */
+ DLM_MIGRATING, /* 40: extension, allows caller to fail a lock
+ request if it is being migrated */
+ DLM_MAXSTATS, /* 41: upper limit for return code validation */
+};
+
+/* for pretty-printing dlm_status error messages */
+const char *dlm_errmsg(enum dlm_status err);
+/* for pretty-printing dlm_status error names */
+const char *dlm_errname(enum dlm_status err);
+
+/* Eventually the DLM will use standard errno values, but in the
+ * meantime this lets us track dlm errors as they bubble up. When we
+ * bring its error reporting into line with the rest of the stack,
+ * these can just be replaced with calls to mlog_errno. */
+#define dlm_error(st) do { \
+ if ((st) != DLM_RECOVERING && \
+ (st) != DLM_MIGRATING && \
+ (st) != DLM_FORWARD) \
+ mlog(ML_ERROR, "dlm status = %s\n", dlm_errname((st))); \
+} while (0)
+
+#define DLM_LKSB_UNUSED1 0x01
+#define DLM_LKSB_PUT_LVB 0x02
+#define DLM_LKSB_GET_LVB 0x04
+#define DLM_LKSB_UNUSED2 0x08
+#define DLM_LKSB_UNUSED3 0x10
+#define DLM_LKSB_UNUSED4 0x20
+#define DLM_LKSB_UNUSED5 0x40
+#define DLM_LKSB_UNUSED6 0x80
+
+#define DLM_LVB_LEN 64
+
+/* Callers are only allowed access to the lvb and status members of
+ * this struct. */
+struct dlm_lockstatus {
+ enum dlm_status status;
+ u32 flags;
+ struct dlm_lock *lockid;
+ char lvb[DLM_LVB_LEN];
+};
+
+/* Valid lock modes. */
+#define LKM_IVMODE (-1) /* invalid mode */
+#define LKM_NLMODE 0 /* null lock */
+#define LKM_CRMODE 1 /* concurrent read unsupported */
+#define LKM_CWMODE 2 /* concurrent write unsupported */
+#define LKM_PRMODE 3 /* protected read */
+#define LKM_PWMODE 4 /* protected write unsupported */
+#define LKM_EXMODE 5 /* exclusive */
+#define LKM_MAXMODE 5
+#define LKM_MODEMASK 0xff
+
+/* Flags passed to dlmlock and dlmunlock:
+ * reserved: flags used by the "real" dlm
+ * only a few are supported by this dlm
+ * (U) = unsupported by ocfs2 dlm */
+#define LKM_ORPHAN 0x00000010 /* this lock is orphanable (U) */
+#define LKM_PARENTABLE 0x00000020 /* this lock was orphaned (U) */
+#define LKM_BLOCK 0x00000040 /* blocking lock request (U) */
+#define LKM_LOCAL 0x00000080 /* local lock request */
+#define LKM_VALBLK 0x00000100 /* lock value block request */
+#define LKM_NOQUEUE 0x00000200 /* non blocking request */
+#define LKM_CONVERT 0x00000400 /* conversion request */
+#define LKM_NODLCKWT 0x00000800 /* this lock wont deadlock (U) */
+#define LKM_UNLOCK 0x00001000 /* deallocate this lock */
+#define LKM_CANCEL 0x00002000 /* cancel conversion request */
+#define LKM_DEQALL 0x00004000 /* remove all locks held by proc (U) */
+#define LKM_INVVALBLK 0x00008000 /* invalidate lock value block */
+#define LKM_SYNCSTS 0x00010000 /* return synchronous status if poss (U) */
+#define LKM_TIMEOUT 0x00020000 /* lock request contains timeout (U) */
+#define LKM_SNGLDLCK 0x00040000 /* request can self-deadlock (U) */
+#define LKM_FINDLOCAL 0x00080000 /* find local lock request (U) */
+#define LKM_PROC_OWNED 0x00100000 /* owned by process, not group (U) */
+#define LKM_XID 0x00200000 /* use transaction id for deadlock (U) */
+#define LKM_XID_CONFLICT 0x00400000 /* do not allow lock inheritance (U) */
+#define LKM_FORCE 0x00800000 /* force unlock flag */
+#define LKM_REVVALBLK 0x01000000 /* temporary solution: re-validate
+ lock value block (U) */
+/* unused */
+#define LKM_UNUSED1 0x00000001 /* unused */
+#define LKM_UNUSED2 0x00000002 /* unused */
+#define LKM_UNUSED3 0x00000004 /* unused */
+#define LKM_UNUSED4 0x00000008 /* unused */
+#define LKM_UNUSED5 0x02000000 /* unused */
+#define LKM_UNUSED6 0x04000000 /* unused */
+#define LKM_UNUSED7 0x08000000 /* unused */
+
+/* ocfs2 extensions: internal only
+ * should never be used by caller */
+#define LKM_MIGRATION 0x10000000 /* extension: lockres is to be migrated
+ to another node */
+#define LKM_PUT_LVB 0x20000000 /* extension: lvb is being passed
+ should be applied to lockres */
+#define LKM_GET_LVB 0x40000000 /* extension: lvb should be copied
+ from lockres when lock is granted */
+#define LKM_RECOVERY 0x80000000 /* extension: flag for recovery lock
+ used to avoid recovery rwsem */
+
+
+typedef void (dlm_astlockfunc_t)(void *);
+typedef void (dlm_bastlockfunc_t)(void *, int);
+typedef void (dlm_astunlockfunc_t)(void *, enum dlm_status);
+
+enum dlm_status dlmlock(struct dlm_ctxt *dlm,
+ int mode,
+ struct dlm_lockstatus *lksb,
+ int flags,
+ const char *name,
+ dlm_astlockfunc_t *ast,
+ void *data,
+ dlm_bastlockfunc_t *bast);
+
+enum dlm_status dlmunlock(struct dlm_ctxt *dlm,
+ struct dlm_lockstatus *lksb,
+ int flags,
+ dlm_astunlockfunc_t *unlockast,
+ void *data);
+
+struct dlm_ctxt * dlm_register_domain(const char *domain, u32 key);
+
+void dlm_unregister_domain(struct dlm_ctxt *dlm);
+
+void dlm_print_one_lock(struct dlm_lock *lockid);
+
+typedef void (dlm_eviction_func)(int, void *);
+struct dlm_eviction_cb {
+ struct list_head ec_item;
+ dlm_eviction_func *ec_func;
+ void *ec_data;
+};
+void dlm_setup_eviction_cb(struct dlm_eviction_cb *cb,
+ dlm_eviction_func *f,
+ void *data);
+void dlm_register_eviction_cb(struct dlm_ctxt *dlm,
+ struct dlm_eviction_cb *cb);
+void dlm_unregister_eviction_cb(struct dlm_eviction_cb *cb);
+
+#endif /* DLMAPI_H */
--- /dev/null
+/* -*- mode: c; c-basic-offset: 8; -*-
+ * vim: noexpandtab sw=8 ts=8 sts=0:
+ *
+ * dlmast.c
+ *
+ * AST and BAST functionality for local and remote nodes
+ *
+ * Copyright (C) 2004 Oracle. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ *
+ */
+
+
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/highmem.h>
+#include <linux/utsname.h>
+#include <linux/init.h>
+#include <linux/sysctl.h>
+#include <linux/random.h>
+#include <linux/blkdev.h>
+#include <linux/socket.h>
+#include <linux/inet.h>
+#include <linux/spinlock.h>
+
+
+#include "cluster/heartbeat.h"
+#include "cluster/nodemanager.h"
+#include "cluster/tcp.h"
+#include "cluster/endian.h"
+
+#include "dlmapi.h"
+#include "dlmcommon.h"
+
+#define MLOG_MASK_PREFIX ML_DLM
+#include "cluster/masklog.h"
+
+static void dlm_update_lvb(struct dlm_ctxt *dlm, struct dlm_lock_resource *res,
+ struct dlm_lock *lock);
+static int dlm_should_cancel_bast(struct dlm_ctxt *dlm, struct dlm_lock *lock);
+
+/* Should be called as an ast gets queued to see if the new
+ * lock level will obsolete a pending bast.
+ * For example, if dlm_thread queued a bast for an EX lock that
+ * was blocking another EX, but before sending the bast the
+ * lock owner downconverted to NL, the bast is now obsolete.
+ * Only the ast should be sent.
+ * This is needed because the lock and convert paths can queue
+ * asts out-of-band (not waiting for dlm_thread) in order to
+ * allow for LKM_NOQUEUE to get immediate responses. */
+static int dlm_should_cancel_bast(struct dlm_ctxt *dlm, struct dlm_lock *lock)
+{
+ assert_spin_locked(&dlm->ast_lock);
+ assert_spin_locked(&lock->spinlock);
+
+ if (lock->ml.highest_blocked == LKM_IVMODE)
+ return 0;
+ BUG_ON(lock->ml.highest_blocked == LKM_NLMODE);
+
+ if (lock->bast_pending &&
+ list_empty(&lock->bast_list))
+ /* old bast already sent, ok */
+ return 0;
+
+ if (lock->ml.type == LKM_EXMODE)
+ /* EX blocks anything left, any bast still valid */
+ return 0;
+ else if (lock->ml.type == LKM_NLMODE)
+ /* NL blocks nothing, no reason to send any bast, cancel it */
+ return 1;
+ else if (lock->ml.highest_blocked != LKM_EXMODE)
+ /* PR only blocks EX */
+ return 1;
+
+ return 0;
+}
+
+static void __dlm_queue_ast(struct dlm_ctxt *dlm, struct dlm_lock *lock)
+{
+ mlog_entry_void();
+
+ BUG_ON(!dlm);
+ BUG_ON(!lock);
+
+ assert_spin_locked(&dlm->ast_lock);
+ if (!list_empty(&lock->ast_list)) {
+ mlog(ML_ERROR, "ast list not empty!! pending=%d, newlevel=%d\n",
+ lock->ast_pending, lock->ml.type);
+ BUG();
+ }
+ BUG_ON(!list_empty(&lock->ast_list));
+ if (lock->ast_pending)
+ mlog(0, "lock has an ast getting flushed right now\n");
+
+ /* putting lock on list, add a ref */
+ dlm_lock_get(lock);
+ spin_lock(&lock->spinlock);
+
+ /* check to see if this ast obsoletes the bast */
+ if (dlm_should_cancel_bast(dlm, lock)) {
+ struct dlm_lock_resource *res = lock->lockres;
+ mlog(0, "%s: cancelling bast for %.*s\n",
+ dlm->name, res->lockname.len, res->lockname.name);
+ lock->bast_pending = 0;
+ list_del_init(&lock->bast_list);
+ lock->ml.highest_blocked = LKM_IVMODE;
+ /* removing lock from list, remove a ref. guaranteed
+ * this won't be the last ref because of the get above,
+ * so res->spinlock will not be taken here */
+ dlm_lock_put(lock);
+ /* free up the reserved bast that we are cancelling.
+ * guaranteed that this will not be the last reserved
+ * ast because *both* an ast and a bast were reserved
+ * to get to this point. the res->spinlock will not be
+ * taken here */
+ dlm_lockres_release_ast(dlm, res);
+ }
+ list_add_tail(&lock->ast_list, &dlm->pending_asts);
+ lock->ast_pending = 1;
+ spin_unlock(&lock->spinlock);
+}
+
+void dlm_queue_ast(struct dlm_ctxt *dlm, struct dlm_lock *lock)
+{
+ mlog_entry_void();
+
+ BUG_ON(!dlm);
+ BUG_ON(!lock);
+
+ spin_lock(&dlm->ast_lock);
+ __dlm_queue_ast(dlm, lock);
+ spin_unlock(&dlm->ast_lock);
+}
+
+
+static void __dlm_queue_bast(struct dlm_ctxt *dlm, struct dlm_lock *lock)
+{
+ mlog_entry_void();
+
+ BUG_ON(!dlm);
+ BUG_ON(!lock);
+ assert_spin_locked(&dlm->ast_lock);
+
+ BUG_ON(!list_empty(&lock->bast_list));
+ if (lock->bast_pending)
+ mlog(0, "lock has a bast getting flushed right now\n");
+
+ /* putting lock on list, add a ref */
+ dlm_lock_get(lock);
+ spin_lock(&lock->spinlock);
+ list_add_tail(&lock->bast_list, &dlm->pending_basts);
+ lock->bast_pending = 1;
+ spin_unlock(&lock->spinlock);
+}
+
+void dlm_queue_bast(struct dlm_ctxt *dlm, struct dlm_lock *lock)
+{
+ mlog_entry_void();
+
+ BUG_ON(!dlm);
+ BUG_ON(!lock);
+
+ spin_lock(&dlm->ast_lock);
+ __dlm_queue_bast(dlm, lock);
+ spin_unlock(&dlm->ast_lock);
+}
+
+static void dlm_update_lvb(struct dlm_ctxt *dlm, struct dlm_lock_resource *res,
+ struct dlm_lock *lock)
+{
+ struct dlm_lockstatus *lksb = lock->lksb;
+ BUG_ON(!lksb);
+
+ /* only updates if this node masters the lockres */
+ if (res->owner == dlm->node_num) {
+
+ spin_lock(&res->spinlock);
+ /* check the lksb flags for the direction */
+ if (lksb->flags & DLM_LKSB_GET_LVB) {
+ mlog(0, "getting lvb from lockres for %s node\n",
+ lock->ml.node == dlm->node_num ? "master" :
+ "remote");
+ memcpy(lksb->lvb, res->lvb, DLM_LVB_LEN);
+ } else if (lksb->flags & DLM_LKSB_PUT_LVB) {
+ mlog(0, "setting lvb from lockres for %s node\n",
+ lock->ml.node == dlm->node_num ? "master" :
+ "remote");
+ memcpy(res->lvb, lksb->lvb, DLM_LVB_LEN);
+ }
+ spin_unlock(&res->spinlock);
+ }
+
+ /* reset any lvb flags on the lksb */
+ lksb->flags &= ~(DLM_LKSB_PUT_LVB|DLM_LKSB_GET_LVB);
+}
+
+void dlm_do_local_ast(struct dlm_ctxt *dlm, struct dlm_lock_resource *res,
+ struct dlm_lock *lock)
+{
+ dlm_astlockfunc_t *fn;
+ struct dlm_lockstatus *lksb;
+
+ mlog_entry_void();
+
+ lksb = lock->lksb;
+ fn = lock->ast;
+ BUG_ON(lock->ml.node != dlm->node_num);
+
+ dlm_update_lvb(dlm, res, lock);
+ (*fn)(lock->astdata);
+}
+
+
+int dlm_do_remote_ast(struct dlm_ctxt *dlm, struct dlm_lock_resource *res,
+ struct dlm_lock *lock)
+{
+ int ret;
+ struct dlm_lockstatus *lksb;
+ int lksbflags;
+
+ mlog_entry_void();
+
+ lksb = lock->lksb;
+ BUG_ON(lock->ml.node == dlm->node_num);
+
+ lksbflags = lksb->flags;
+ dlm_update_lvb(dlm, res, lock);
+
+ /* lock request came from another node
+ * go do the ast over there */
+ ret = dlm_send_proxy_ast(dlm, res, lock, lksbflags);
+ return ret;
+}
+
+void dlm_do_local_bast(struct dlm_ctxt *dlm, struct dlm_lock_resource *res,
+ struct dlm_lock *lock, int blocked_type)
+{
+ dlm_bastlockfunc_t *fn = lock->bast;
+
+ mlog_entry_void();
+ BUG_ON(lock->ml.node != dlm->node_num);
+
+ (*fn)(lock->astdata, blocked_type);
+}
+
+
+
+int dlm_proxy_ast_handler(struct o2net_msg *msg, u32 len, void *data)
+{
+ int ret;
+ unsigned int locklen;
+ struct dlm_ctxt *dlm = data;
+ struct dlm_lock_resource *res = NULL;
+ struct dlm_lock *lock = NULL;
+ struct dlm_proxy_ast *past = (struct dlm_proxy_ast *) msg->buf;
+ char *name;
+ struct list_head *iter, *head=NULL;
+ u64 cookie;
+ u32 flags;
+
+ if (!dlm_grab(dlm)) {
+ dlm_error(DLM_REJECTED);
+ return DLM_REJECTED;
+ }
+
+ mlog_bug_on_msg(!dlm_domain_fully_joined(dlm),
+ "Domain %s not fully joined!\n", dlm->name);
+
+ name = past->name;
+ locklen = past->namelen;
+ cookie = be64_to_cpu(past->cookie);
+ flags = be32_to_cpu(past->flags);
+
+ if (locklen > DLM_LOCKID_NAME_MAX) {
+ ret = DLM_IVBUFLEN;
+ mlog(ML_ERROR, "Invalid name length in proxy ast handler!\n");
+ goto leave;
+ }
+
+ if ((flags & (LKM_PUT_LVB|LKM_GET_LVB)) ==
+ (LKM_PUT_LVB|LKM_GET_LVB)) {
+ mlog(ML_ERROR, "both PUT and GET lvb specified\n");
+ ret = DLM_BADARGS;
+ goto leave;
+ }
+
+ mlog(0, "lvb: %s\n", flags & LKM_PUT_LVB ? "put lvb" :
+ (flags & LKM_GET_LVB ? "get lvb" : "none"));
+
+ mlog(0, "type=%d, blocked_type=%d\n", past->type, past->blocked_type);
+
+ if (past->type != DLM_AST &&
+ past->type != DLM_BAST) {
+ mlog(ML_ERROR, "Unknown ast type! %d, cookie=%"MLFu64", "
+ "name=%.*s\n", past->type, cookie, locklen, name);
+ ret = DLM_IVLOCKID;
+ goto leave;
+ }
+
+ res = dlm_lookup_lockres(dlm, name, locklen);
+ if (!res) {
+ mlog(ML_ERROR, "got %sast for unknown lockres! "
+ "cookie=%"MLFu64", name=%.*s, namelen=%u\n",
+ past->type == DLM_AST ? "" : "b",
+ cookie, locklen, name, locklen);
+ ret = DLM_IVLOCKID;
+ goto leave;
+ }
+
+ /* cannot get a proxy ast message if this node owns it */
+ BUG_ON(res->owner == dlm->node_num);
+
+ mlog(0, "lockres %.*s\n", res->lockname.len, res->lockname.name);
+
+ spin_lock(&res->spinlock);
+ if (res->state & DLM_LOCK_RES_RECOVERING) {
+ mlog(0, "responding with DLM_RECOVERING!\n");
+ ret = DLM_RECOVERING;
+ goto unlock_out;
+ }
+ if (res->state & DLM_LOCK_RES_MIGRATING) {
+ mlog(0, "responding with DLM_MIGRATING!\n");
+ ret = DLM_MIGRATING;
+ goto unlock_out;
+ }
+ /* try convert queue for both ast/bast */
+ head = &res->converting;
+ lock = NULL;
+ list_for_each(iter, head) {
+ lock = list_entry (iter, struct dlm_lock, list);
+ if (be64_to_cpu(lock->ml.cookie) == cookie)
+ goto do_ast;
+ }
+
+ /* if not on convert, try blocked for ast, granted for bast */
+ if (past->type == DLM_AST)
+ head = &res->blocked;
+ else
+ head = &res->granted;
+
+ list_for_each(iter, head) {
+ lock = list_entry (iter, struct dlm_lock, list);
+ if (be64_to_cpu(lock->ml.cookie) == cookie)
+ goto do_ast;
+ }
+
+ mlog(ML_ERROR, "got %sast for unknown lock! cookie=%"MLFu64", "
+ "name=%.*s, namelen=%u\n",
+ past->type == DLM_AST ? "" : "b", cookie, locklen, name, locklen);
+
+ ret = DLM_NORMAL;
+unlock_out:
+ spin_unlock(&res->spinlock);
+ goto leave;
+
+do_ast:
+ ret = DLM_NORMAL;
+ if (past->type == DLM_AST) {
+ /* do not alter lock refcount. switching lists. */
+ list_del_init(&lock->list);
+ list_add_tail(&lock->list, &res->granted);
+ mlog(0, "ast: adding to granted list... type=%d, "
+ "convert_type=%d\n", lock->ml.type, lock->ml.convert_type);
+ if (lock->ml.convert_type != LKM_IVMODE) {
+ lock->ml.type = lock->ml.convert_type;
+ lock->ml.convert_type = LKM_IVMODE;
+ } else {
+ // should already be there....
+ }
+
+ lock->lksb->status = DLM_NORMAL;
+
+ /* if we requested the lvb, fetch it into our lksb now */
+ if (flags & LKM_GET_LVB) {
+ BUG_ON(!(lock->lksb->flags & DLM_LKSB_GET_LVB));
+ memcpy(lock->lksb->lvb, past->lvb, DLM_LVB_LEN);
+ }
+ }
+ spin_unlock(&res->spinlock);
+
+ if (past->type == DLM_AST)
+ dlm_do_local_ast(dlm, res, lock);
+ else
+ dlm_do_local_bast(dlm, res, lock, past->blocked_type);
+
+leave:
+
+ if (res)
+ dlm_lockres_put(res);
+
+ dlm_put(dlm);
+ return ret;
+}
+
+
+
+int dlm_send_proxy_ast_msg(struct dlm_ctxt *dlm, struct dlm_lock_resource *res,
+ struct dlm_lock *lock, int msg_type,
+ int blocked_type, int flags)
+{
+ int ret = 0;
+ struct dlm_proxy_ast past;
+ struct kvec vec[2];
+ size_t veclen = 1;
+ int status;
+
+ mlog_entry("res %.*s, to=%u, type=%d, blocked_type=%d\n",
+ res->lockname.len, res->lockname.name, lock->ml.node,
+ msg_type, blocked_type);
+
+ memset(&past, 0, sizeof(struct dlm_proxy_ast));
+ past.node_idx = dlm->node_num;
+ past.type = msg_type;
+ past.blocked_type = blocked_type;
+ past.namelen = res->lockname.len;
+ memcpy(past.name, res->lockname.name, past.namelen);
+ past.cookie = lock->ml.cookie;
+
+ vec[0].iov_len = sizeof(struct dlm_proxy_ast);
+ vec[0].iov_base = &past;
+ if (flags & DLM_LKSB_GET_LVB) {
+ mlog(0, "returning requested LVB data\n");
+ be32_add_cpu(&past.flags, LKM_GET_LVB);
+ vec[1].iov_len = DLM_LVB_LEN;
+ vec[1].iov_base = lock->lksb->lvb;
+ veclen++;
+ }
+
+ ret = o2net_send_message_vec(DLM_PROXY_AST_MSG, dlm->key, vec, veclen,
+ lock->ml.node, &status);
+ if (ret < 0)
+ mlog_errno(ret);
+ else {
+ if (status == DLM_RECOVERING) {
+ mlog(ML_ERROR, "sent AST to node %u, it thinks this "
+ "node is dead!\n", lock->ml.node);
+ BUG();
+ } else if (status == DLM_MIGRATING) {
+ mlog(ML_ERROR, "sent AST to node %u, it returned "
+ "DLM_MIGRATING!\n", lock->ml.node);
+ BUG();
+ } else if (status != DLM_NORMAL) {
+ mlog(ML_ERROR, "AST to node %u returned %d!\n",
+ lock->ml.node, status);
+ /* ignore it */
+ }
+ ret = 0;
+ }
+ return ret;
+}
--- /dev/null
+/* -*- mode: c; c-basic-offset: 8; -*-
+ * vim: noexpandtab sw=8 ts=8 sts=0:
+ *
+ * dlmcommon.h
+ *
+ * Copyright (C) 2004 Oracle. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ *
+ */
+
+#ifndef DLMCOMMON_H
+#define DLMCOMMON_H
+
+#include <linux/kref.h>
+
+#define DLM_HB_NODE_DOWN_PRI (0xf000000)
+#define DLM_HB_NODE_UP_PRI (0x8000000)
+
+#define DLM_LOCKID_NAME_MAX 32
+
+#define DLM_DOMAIN_NAME_MAX_LEN 255
+#define DLM_LOCK_RES_OWNER_UNKNOWN O2NM_MAX_NODES
+#define DLM_THREAD_SHUFFLE_INTERVAL 5 // flush everything every 5 passes
+#define DLM_THREAD_MS 200 // flush at least every 200 ms
+
+#define DLM_HASH_BITS 7
+#define DLM_HASH_SIZE (1 << DLM_HASH_BITS)
+#define DLM_HASH_MASK (DLM_HASH_SIZE - 1)
+
+enum dlm_ast_type {
+ DLM_AST = 0,
+ DLM_BAST,
+ DLM_ASTUNLOCK
+};
+
+
+#define LKM_VALID_FLAGS (LKM_VALBLK | LKM_CONVERT | LKM_UNLOCK | \
+ LKM_CANCEL | LKM_INVVALBLK | LKM_FORCE | \
+ LKM_RECOVERY | LKM_LOCAL | LKM_NOQUEUE)
+
+#define DLM_RECOVERY_LOCK_NAME "$RECOVERY"
+#define DLM_RECOVERY_LOCK_NAME_LEN 9
+
+static inline int dlm_is_recovery_lock(const char *lock_name, int name_len)
+{
+ if (name_len == DLM_RECOVERY_LOCK_NAME_LEN &&
+ memcmp(lock_name, DLM_RECOVERY_LOCK_NAME, name_len)==0)
+ return 1;
+ return 0;
+}
+
+#define DLM_RECO_STATE_ACTIVE 0x0001
+
+struct dlm_recovery_ctxt
+{
+ struct list_head resources;
+ struct list_head received;
+ struct list_head node_data;
+ u8 new_master;
+ u8 dead_node;
+ u16 state;
+ unsigned long node_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
+ wait_queue_head_t event;
+};
+
+enum dlm_ctxt_state {
+ DLM_CTXT_NEW = 0,
+ DLM_CTXT_JOINED,
+ DLM_CTXT_IN_SHUTDOWN,
+ DLM_CTXT_LEAVING,
+};
+
+struct dlm_ctxt
+{
+ struct list_head list;
+ struct list_head *resources;
+ struct list_head dirty_list;
+ struct list_head purge_list;
+ struct list_head pending_asts;
+ struct list_head pending_basts;
+ unsigned int purge_count;
+ spinlock_t spinlock;
+ spinlock_t ast_lock;
+ char *name;
+ u8 node_num;
+ u32 key;
+ u8 joining_node;
+ wait_queue_head_t dlm_join_events;
+ unsigned long live_nodes_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
+ unsigned long domain_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
+ unsigned long recovery_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
+ struct dlm_recovery_ctxt reco;
+ spinlock_t master_lock;
+ struct list_head master_list;
+ struct list_head mle_hb_events;
+
+ /* these give a really vague idea of the system load */
+ atomic_t local_resources;
+ atomic_t remote_resources;
+ atomic_t unknown_resources;
+
+ /* NOTE: Next three are protected by dlm_domain_lock */
+ struct kref dlm_refs;
+ enum dlm_ctxt_state dlm_state;
+ unsigned int num_joins;
+
+ struct o2hb_callback_func dlm_hb_up;
+ struct o2hb_callback_func dlm_hb_down;
+ struct task_struct *dlm_thread_task;
+ struct task_struct *dlm_reco_thread_task;
+ wait_queue_head_t dlm_thread_wq;
+ wait_queue_head_t dlm_reco_thread_wq;
+ wait_queue_head_t ast_wq;
+ wait_queue_head_t migration_wq;
+
+ struct work_struct dispatched_work;
+ struct list_head work_list;
+ spinlock_t work_lock;
+ struct list_head dlm_domain_handlers;
+ struct list_head dlm_eviction_callbacks;
+};
+
+/* these keventd work queue items are for less-frequently
+ * called functions that cannot be directly called from the
+ * net message handlers for some reason, usually because
+ * they need to send net messages of their own. */
+void dlm_dispatch_work(void *data);
+
+struct dlm_lock_resource;
+struct dlm_work_item;
+
+typedef void (dlm_workfunc_t)(struct dlm_work_item *, void *);
+
+struct dlm_request_all_locks_priv
+{
+ u8 reco_master;
+ u8 dead_node;
+};
+
+struct dlm_mig_lockres_priv
+{
+ struct dlm_lock_resource *lockres;
+ u8 real_master;
+};
+
+struct dlm_assert_master_priv
+{
+ struct dlm_lock_resource *lockres;
+ u8 request_from;
+ u32 flags;
+ unsigned ignore_higher:1;
+};
+
+
+struct dlm_work_item
+{
+ struct list_head list;
+ dlm_workfunc_t *func;
+ struct dlm_ctxt *dlm;
+ void *data;
+ union {
+ struct dlm_request_all_locks_priv ral;
+ struct dlm_mig_lockres_priv ml;
+ struct dlm_assert_master_priv am;
+ } u;
+};
+
+static inline void dlm_init_work_item(struct dlm_ctxt *dlm,
+ struct dlm_work_item *i,
+ dlm_workfunc_t *f, void *data)
+{
+ memset(i, 0, sizeof(*i));
+ i->func = f;
+ INIT_LIST_HEAD(&i->list);
+ i->data = data;
+ i->dlm = dlm; /* must have already done a dlm_grab on this! */
+}
+
+
+
+static inline void __dlm_set_joining_node(struct dlm_ctxt *dlm,
+ u8 node)
+{
+ assert_spin_locked(&dlm->spinlock);
+
+ dlm->joining_node = node;
+ wake_up(&dlm->dlm_join_events);
+}
+
+#define DLM_LOCK_RES_UNINITED 0x00000001
+#define DLM_LOCK_RES_RECOVERING 0x00000002
+#define DLM_LOCK_RES_READY 0x00000004
+#define DLM_LOCK_RES_DIRTY 0x00000008
+#define DLM_LOCK_RES_IN_PROGRESS 0x00000010
+#define DLM_LOCK_RES_MIGRATING 0x00000020
+
+#define DLM_PURGE_INTERVAL_MS (8 * 1000)
+
+struct dlm_lock_resource
+{
+ /* WARNING: Please see the comment in dlm_init_lockres before
+ * adding fields here. */
+ struct list_head list;
+ struct kref refs;
+
+ /* please keep these next 3 in this order
+ * some funcs want to iterate over all lists */
+ struct list_head granted;
+ struct list_head converting;
+ struct list_head blocked;
+
+ struct list_head dirty;
+ struct list_head recovering; // dlm_recovery_ctxt.resources list
+
+ /* unused lock resources have their last_used stamped and are
+ * put on a list for the dlm thread to run. */
+ struct list_head purge;
+ unsigned long last_used;
+
+ unsigned migration_pending:1;
+ atomic_t asts_reserved;
+ spinlock_t spinlock;
+ wait_queue_head_t wq;
+ u8 owner; //node which owns the lock resource, or unknown
+ u16 state;
+ struct qstr lockname;
+ char lvb[DLM_LVB_LEN];
+};
+
+struct dlm_migratable_lock
+{
+ __be64 cookie;
+
+ /* these 3 are just padding for the in-memory structure, but
+ * list and flags are actually used when sent over the wire */
+ __be16 pad1;
+ u8 list; // 0=granted, 1=converting, 2=blocked
+ u8 flags;
+
+ s8 type;
+ s8 convert_type;
+ s8 highest_blocked;
+ u8 node;
+}; // 16 bytes
+
+struct dlm_lock
+{
+ struct dlm_migratable_lock ml;
+
+ struct list_head list;
+ struct list_head ast_list;
+ struct list_head bast_list;
+ struct dlm_lock_resource *lockres;
+ spinlock_t spinlock;
+ struct kref lock_refs;
+
+ // ast and bast must be callable while holding a spinlock!
+ dlm_astlockfunc_t *ast;
+ dlm_bastlockfunc_t *bast;
+ void *astdata;
+ struct dlm_lockstatus *lksb;
+ unsigned ast_pending:1,
+ bast_pending:1,
+ convert_pending:1,
+ lock_pending:1,
+ cancel_pending:1,
+ unlock_pending:1,
+ lksb_kernel_allocated:1;
+};
+
+
+#define DLM_LKSB_UNUSED1 0x01
+#define DLM_LKSB_PUT_LVB 0x02
+#define DLM_LKSB_GET_LVB 0x04
+#define DLM_LKSB_UNUSED2 0x08
+#define DLM_LKSB_UNUSED3 0x10
+#define DLM_LKSB_UNUSED4 0x20
+#define DLM_LKSB_UNUSED5 0x40
+#define DLM_LKSB_UNUSED6 0x80
+
+
+enum dlm_lockres_list {
+ DLM_GRANTED_LIST = 0,
+ DLM_CONVERTING_LIST,
+ DLM_BLOCKED_LIST
+};
+
+static inline struct list_head *
+dlm_list_idx_to_ptr(struct dlm_lock_resource *res, enum dlm_lockres_list idx)
+{
+ struct list_head *ret = NULL;
+ if (idx == DLM_GRANTED_LIST)
+ ret = &res->granted;
+ else if (idx == DLM_CONVERTING_LIST)
+ ret = &res->converting;
+ else if (idx == DLM_BLOCKED_LIST)
+ ret = &res->blocked;
+ else
+ BUG();
+ return ret;
+}
+
+
+
+
+struct dlm_node_iter
+{
+ unsigned long node_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
+ int curnode;
+};
+
+
+enum {
+ DLM_MASTER_REQUEST_MSG = 500,
+ DLM_UNUSED_MSG1, /* 501 */
+ DLM_ASSERT_MASTER_MSG, /* 502 */
+ DLM_CREATE_LOCK_MSG, /* 503 */
+ DLM_CONVERT_LOCK_MSG, /* 504 */
+ DLM_PROXY_AST_MSG, /* 505 */
+ DLM_UNLOCK_LOCK_MSG, /* 506 */
+ DLM_UNUSED_MSG2, /* 507 */
+ DLM_MIGRATE_REQUEST_MSG, /* 508 */
+ DLM_MIG_LOCKRES_MSG, /* 509 */
+ DLM_QUERY_JOIN_MSG, /* 510 */
+ DLM_ASSERT_JOINED_MSG, /* 511 */
+ DLM_CANCEL_JOIN_MSG, /* 512 */
+ DLM_EXIT_DOMAIN_MSG, /* 513 */
+ DLM_MASTER_REQUERY_MSG, /* 514 */
+ DLM_LOCK_REQUEST_MSG, /* 515 */
+ DLM_RECO_DATA_DONE_MSG, /* 516 */
+ DLM_BEGIN_RECO_MSG, /* 517 */
+ DLM_FINALIZE_RECO_MSG /* 518 */
+};
+
+struct dlm_reco_node_data
+{
+ int state;
+ u8 node_num;
+ struct list_head list;
+};
+
+enum {
+ DLM_RECO_NODE_DATA_DEAD = -1,
+ DLM_RECO_NODE_DATA_INIT = 0,
+ DLM_RECO_NODE_DATA_REQUESTING,
+ DLM_RECO_NODE_DATA_REQUESTED,
+ DLM_RECO_NODE_DATA_RECEIVING,
+ DLM_RECO_NODE_DATA_DONE,
+ DLM_RECO_NODE_DATA_FINALIZE_SENT,
+};
+
+
+enum {
+ DLM_MASTER_RESP_NO = 0,
+ DLM_MASTER_RESP_YES,
+ DLM_MASTER_RESP_MAYBE,
+ DLM_MASTER_RESP_ERROR
+};
+
+
+struct dlm_master_request
+{
+ u8 node_idx;
+ u8 namelen;
+ __be16 pad1;
+ __be32 flags;
+
+ u8 name[O2NM_MAX_NAME_LEN];
+};
+
+#define DLM_ASSERT_MASTER_MLE_CLEANUP 0x00000001
+#define DLM_ASSERT_MASTER_REQUERY 0x00000002
+#define DLM_ASSERT_MASTER_FINISH_MIGRATION 0x00000004
+struct dlm_assert_master
+{
+ u8 node_idx;
+ u8 namelen;
+ __be16 pad1;
+ __be32 flags;
+
+ u8 name[O2NM_MAX_NAME_LEN];
+};
+
+struct dlm_migrate_request
+{
+ u8 master;
+ u8 new_master;
+ u8 namelen;
+ u8 pad1;
+ __be32 pad2;
+ u8 name[O2NM_MAX_NAME_LEN];
+};
+
+struct dlm_master_requery
+{
+ u8 pad1;
+ u8 pad2;
+ u8 node_idx;
+ u8 namelen;
+ __be32 pad3;
+ u8 name[O2NM_MAX_NAME_LEN];
+};
+
+#define DLM_MRES_RECOVERY 0x01
+#define DLM_MRES_MIGRATION 0x02
+#define DLM_MRES_ALL_DONE 0x04
+
+/*
+ * We would like to get one whole lockres into a single network
+ * message whenever possible. Generally speaking, there will be
+ * at most one dlm_lock on a lockres for each node in the cluster,
+ * plus (infrequently) any additional locks coming in from userdlm.
+ *
+ * struct _dlm_lockres_page
+ * {
+ * dlm_migratable_lockres mres;
+ * dlm_migratable_lock ml[DLM_MAX_MIGRATABLE_LOCKS];
+ * u8 pad[DLM_MIG_LOCKRES_RESERVED];
+ * };
+ *
+ * from ../cluster/tcp.h
+ * NET_MAX_PAYLOAD_BYTES (4096 - sizeof(net_msg))
+ * (roughly 4080 bytes)
+ * and sizeof(dlm_migratable_lockres) = 112 bytes
+ * and sizeof(dlm_migratable_lock) = 16 bytes
+ *
+ * Choosing DLM_MAX_MIGRATABLE_LOCKS=240 and
+ * DLM_MIG_LOCKRES_RESERVED=128 means we have this:
+ *
+ * (DLM_MAX_MIGRATABLE_LOCKS * sizeof(dlm_migratable_lock)) +
+ * sizeof(dlm_migratable_lockres) + DLM_MIG_LOCKRES_RESERVED =
+ * NET_MAX_PAYLOAD_BYTES
+ * (240 * 16) + 112 + 128 = 4080
+ *
+ * So a lockres would need more than 240 locks before it would
+ * use more than one network packet to recover. Not too bad.
+ */
+#define DLM_MAX_MIGRATABLE_LOCKS 240
+
+struct dlm_migratable_lockres
+{
+ u8 master;
+ u8 lockname_len;
+ u8 num_locks; // locks sent in this structure
+ u8 flags;
+ __be32 total_locks; // locks to be sent for this migration cookie
+ __be64 mig_cookie; // cookie for this lockres migration
+ // or zero if not needed
+ // 16 bytes
+ u8 lockname[DLM_LOCKID_NAME_MAX];
+ // 48 bytes
+ u8 lvb[DLM_LVB_LEN];
+ // 112 bytes
+ struct dlm_migratable_lock ml[0]; // 16 bytes each, begins at byte 112
+};
+#define DLM_MIG_LOCKRES_MAX_LEN \
+ (sizeof(struct dlm_migratable_lockres) + \
+ (sizeof(struct dlm_migratable_lock) * \
+ DLM_MAX_MIGRATABLE_LOCKS) )
+
+/* from above, 128 bytes
+ * for some undetermined future use */
+#define DLM_MIG_LOCKRES_RESERVED (NET_MAX_PAYLOAD_BYTES - \
+ DLM_MIG_LOCKRES_MAX_LEN)
+
+struct dlm_create_lock
+{
+ __be64 cookie;
+
+ __be32 flags;
+ u8 pad1;
+ u8 node_idx;
+ s8 requested_type;
+ u8 namelen;
+
+ u8 name[O2NM_MAX_NAME_LEN];
+};
+
+struct dlm_convert_lock
+{
+ __be64 cookie;
+
+ __be32 flags;
+ u8 pad1;
+ u8 node_idx;
+ s8 requested_type;
+ u8 namelen;
+
+ u8 name[O2NM_MAX_NAME_LEN];
+
+ s8 lvb[0];
+};
+#define DLM_CONVERT_LOCK_MAX_LEN (sizeof(struct dlm_convert_lock)+DLM_LVB_LEN)
+
+struct dlm_unlock_lock
+{
+ __be64 cookie;
+
+ __be32 flags;
+ __be16 pad1;
+ u8 node_idx;
+ u8 namelen;
+
+ u8 name[O2NM_MAX_NAME_LEN];
+
+ s8 lvb[0];
+};
+#define DLM_UNLOCK_LOCK_MAX_LEN (sizeof(struct dlm_unlock_lock)+DLM_LVB_LEN)
+
+struct dlm_proxy_ast
+{
+ __be64 cookie;
+
+ __be32 flags;
+ u8 node_idx;
+ u8 type;
+ u8 blocked_type;
+ u8 namelen;
+
+ u8 name[O2NM_MAX_NAME_LEN];
+
+ s8 lvb[0];
+};
+#define DLM_PROXY_AST_MAX_LEN (sizeof(struct dlm_proxy_ast)+DLM_LVB_LEN)
+
+#define DLM_MOD_KEY (0x666c6172)
+enum dlm_query_join_response {
+ JOIN_DISALLOW = 0,
+ JOIN_OK,
+ JOIN_OK_NO_MAP,
+};
+
+struct dlm_lock_request
+{
+ u8 node_idx;
+ u8 dead_node;
+ __be16 pad1;
+ __be32 pad2;
+};
+
+struct dlm_reco_data_done
+{
+ u8 node_idx;
+ u8 dead_node;
+ __be16 pad1;
+ __be32 pad2;
+
+ /* unused for now */
+ /* eventually we can use this to attempt
+ * lvb recovery based on each node's info */
+ u8 reco_lvb[DLM_LVB_LEN];
+};
+
+struct dlm_begin_reco
+{
+ u8 node_idx;
+ u8 dead_node;
+ __be16 pad1;
+ __be32 pad2;
+};
+
+
+struct dlm_query_join_request
+{
+ u8 node_idx;
+ u8 pad1[2];
+ u8 name_len;
+ u8 domain[O2NM_MAX_NAME_LEN];
+};
+
+struct dlm_assert_joined
+{
+ u8 node_idx;
+ u8 pad1[2];
+ u8 name_len;
+ u8 domain[O2NM_MAX_NAME_LEN];
+};
+
+struct dlm_cancel_join
+{
+ u8 node_idx;
+ u8 pad1[2];
+ u8 name_len;
+ u8 domain[O2NM_MAX_NAME_LEN];
+};
+
+struct dlm_exit_domain
+{
+ u8 node_idx;
+ u8 pad1[3];
+};
+
+struct dlm_finalize_reco
+{
+ u8 node_idx;
+ u8 dead_node;
+ __be16 pad1;
+ __be32 pad2;
+};
+
+static inline enum dlm_status
+__dlm_lockres_state_to_status(struct dlm_lock_resource *res)
+{
+ enum dlm_status status = DLM_NORMAL;
+
+ assert_spin_locked(&res->spinlock);
+
+ if (res->state & DLM_LOCK_RES_RECOVERING)
+ status = DLM_RECOVERING;
+ else if (res->state & DLM_LOCK_RES_MIGRATING)
+ status = DLM_MIGRATING;
+ else if (res->state & DLM_LOCK_RES_IN_PROGRESS)
+ status = DLM_FORWARD;
+
+ return status;
+}
+
+struct dlm_lock * dlm_new_lock(int type, u8 node, u64 cookie,
+ struct dlm_lockstatus *lksb);
+void dlm_lock_get(struct dlm_lock *lock);
+void dlm_lock_put(struct dlm_lock *lock);
+
+void dlm_lock_attach_lockres(struct dlm_lock *lock,
+ struct dlm_lock_resource *res);
+
+int dlm_create_lock_handler(struct o2net_msg *msg, u32 len, void *data);
+int dlm_convert_lock_handler(struct o2net_msg *msg, u32 len, void *data);
+int dlm_proxy_ast_handler(struct o2net_msg *msg, u32 len, void *data);
+
+void dlm_revert_pending_convert(struct dlm_lock_resource *res,
+ struct dlm_lock *lock);
+void dlm_revert_pending_lock(struct dlm_lock_resource *res,
+ struct dlm_lock *lock);
+
+int dlm_unlock_lock_handler(struct o2net_msg *msg, u32 len, void *data);
+void dlm_commit_pending_cancel(struct dlm_lock_resource *res,
+ struct dlm_lock *lock);
+void dlm_commit_pending_unlock(struct dlm_lock_resource *res,
+ struct dlm_lock *lock);
+
+int dlm_launch_thread(struct dlm_ctxt *dlm);
+void dlm_complete_thread(struct dlm_ctxt *dlm);
+int dlm_launch_recovery_thread(struct dlm_ctxt *dlm);
+void dlm_complete_recovery_thread(struct dlm_ctxt *dlm);
+void dlm_wait_for_recovery(struct dlm_ctxt *dlm);
+
+void dlm_put(struct dlm_ctxt *dlm);
+struct dlm_ctxt *dlm_grab(struct dlm_ctxt *dlm);
+int dlm_domain_fully_joined(struct dlm_ctxt *dlm);
+
+void __dlm_lockres_calc_usage(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res);
+void dlm_lockres_calc_usage(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res);
+void dlm_purge_lockres(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *lockres);
+void dlm_lockres_get(struct dlm_lock_resource *res);
+void dlm_lockres_put(struct dlm_lock_resource *res);
+void __dlm_unhash_lockres(struct dlm_lock_resource *res);
+void __dlm_insert_lockres(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res);
+struct dlm_lock_resource * __dlm_lookup_lockres(struct dlm_ctxt *dlm,
+ const char *name,
+ unsigned int len);
+struct dlm_lock_resource * dlm_lookup_lockres(struct dlm_ctxt *dlm,
+ const char *name,
+ unsigned int len);
+
+int dlm_is_host_down(int errno);
+void dlm_change_lockres_owner(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res,
+ u8 owner);
+struct dlm_lock_resource * dlm_get_lock_resource(struct dlm_ctxt *dlm,
+ const char *lockid,
+ int flags);
+struct dlm_lock_resource *dlm_new_lockres(struct dlm_ctxt *dlm,
+ const char *name,
+ unsigned int namelen);
+
+void dlm_queue_ast(struct dlm_ctxt *dlm, struct dlm_lock *lock);
+void dlm_queue_bast(struct dlm_ctxt *dlm, struct dlm_lock *lock);
+void dlm_do_local_ast(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res,
+ struct dlm_lock *lock);
+int dlm_do_remote_ast(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res,
+ struct dlm_lock *lock);
+void dlm_do_local_bast(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res,
+ struct dlm_lock *lock,
+ int blocked_type);
+int dlm_send_proxy_ast_msg(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res,
+ struct dlm_lock *lock,
+ int msg_type,
+ int blocked_type, int flags);
+static inline int dlm_send_proxy_bast(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res,
+ struct dlm_lock *lock,
+ int blocked_type)
+{
+ return dlm_send_proxy_ast_msg(dlm, res, lock, DLM_BAST,
+ blocked_type, 0);
+}
+
+static inline int dlm_send_proxy_ast(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res,
+ struct dlm_lock *lock,
+ int flags)
+{
+ return dlm_send_proxy_ast_msg(dlm, res, lock, DLM_AST,
+ 0, flags);
+}
+
+void dlm_print_one_lock_resource(struct dlm_lock_resource *res);
+void __dlm_print_one_lock_resource(struct dlm_lock_resource *res);
+
+u8 dlm_nm_this_node(struct dlm_ctxt *dlm);
+void dlm_kick_thread(struct dlm_ctxt *dlm, struct dlm_lock_resource *res);
+void __dlm_dirty_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *res);
+
+
+int dlm_nm_init(struct dlm_ctxt *dlm);
+int dlm_heartbeat_init(struct dlm_ctxt *dlm);
+void dlm_hb_node_down_cb(struct o2nm_node *node, int idx, void *data);
+void dlm_hb_node_up_cb(struct o2nm_node *node, int idx, void *data);
+
+int dlm_lockres_is_dirty(struct dlm_ctxt *dlm, struct dlm_lock_resource *res);
+int dlm_migrate_lockres(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res,
+ u8 target);
+int dlm_finish_migration(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res,
+ u8 old_master);
+void dlm_lockres_release_ast(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res);
+void __dlm_lockres_reserve_ast(struct dlm_lock_resource *res);
+
+int dlm_master_request_handler(struct o2net_msg *msg, u32 len, void *data);
+int dlm_assert_master_handler(struct o2net_msg *msg, u32 len, void *data);
+int dlm_migrate_request_handler(struct o2net_msg *msg, u32 len, void *data);
+int dlm_mig_lockres_handler(struct o2net_msg *msg, u32 len, void *data);
+int dlm_master_requery_handler(struct o2net_msg *msg, u32 len, void *data);
+int dlm_request_all_locks_handler(struct o2net_msg *msg, u32 len, void *data);
+int dlm_reco_data_done_handler(struct o2net_msg *msg, u32 len, void *data);
+int dlm_begin_reco_handler(struct o2net_msg *msg, u32 len, void *data);
+int dlm_finalize_reco_handler(struct o2net_msg *msg, u32 len, void *data);
+
+int dlm_dispatch_assert_master(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res,
+ int ignore_higher,
+ u8 request_from,
+ u32 flags);
+
+
+int dlm_send_one_lockres(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res,
+ struct dlm_migratable_lockres *mres,
+ u8 send_to,
+ u8 flags);
+void dlm_move_lockres_to_recovery_list(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res);
+
+/* will exit holding res->spinlock, but may drop in function */
+void __dlm_wait_on_lockres_flags(struct dlm_lock_resource *res, int flags);
+void __dlm_wait_on_lockres_flags_set(struct dlm_lock_resource *res, int flags);
+
+/* will exit holding res->spinlock, but may drop in function */
+static inline void __dlm_wait_on_lockres(struct dlm_lock_resource *res)
+{
+ __dlm_wait_on_lockres_flags(res, (DLM_LOCK_RES_IN_PROGRESS|
+ DLM_LOCK_RES_RECOVERING|
+ DLM_LOCK_RES_MIGRATING));
+}
+
+
+int dlm_init_mle_cache(void);
+void dlm_destroy_mle_cache(void);
+void dlm_hb_event_notify_attached(struct dlm_ctxt *dlm, int idx, int node_up);
+void dlm_clean_master_list(struct dlm_ctxt *dlm,
+ u8 dead_node);
+int dlm_lock_basts_flushed(struct dlm_ctxt *dlm, struct dlm_lock *lock);
+
+
+static inline const char * dlm_lock_mode_name(int mode)
+{
+ switch (mode) {
+ case LKM_EXMODE:
+ return "EX";
+ case LKM_PRMODE:
+ return "PR";
+ case LKM_NLMODE:
+ return "NL";
+ }
+ return "UNKNOWN";
+}
+
+
+static inline int dlm_lock_compatible(int existing, int request)
+{
+ /* NO_LOCK compatible with all */
+ if (request == LKM_NLMODE ||
+ existing == LKM_NLMODE)
+ return 1;
+
+ /* EX incompatible with all non-NO_LOCK */
+ if (request == LKM_EXMODE)
+ return 0;
+
+ /* request must be PR, which is compatible with PR */
+ if (existing == LKM_PRMODE)
+ return 1;
+
+ return 0;
+}
+
+static inline int dlm_lock_on_list(struct list_head *head,
+ struct dlm_lock *lock)
+{
+ struct list_head *iter;
+ struct dlm_lock *tmplock;
+
+ list_for_each(iter, head) {
+ tmplock = list_entry(iter, struct dlm_lock, list);
+ if (tmplock == lock)
+ return 1;
+ }
+ return 0;
+}
+
+
+static inline enum dlm_status dlm_err_to_dlm_status(int err)
+{
+ enum dlm_status ret;
+ if (err == -ENOMEM)
+ ret = DLM_SYSERR;
+ else if (err == -ETIMEDOUT || o2net_link_down(err, NULL))
+ ret = DLM_NOLOCKMGR;
+ else if (err == -EINVAL)
+ ret = DLM_BADPARAM;
+ else if (err == -ENAMETOOLONG)
+ ret = DLM_IVBUFLEN;
+ else
+ ret = DLM_BADARGS;
+ return ret;
+}
+
+
+static inline void dlm_node_iter_init(unsigned long *map,
+ struct dlm_node_iter *iter)
+{
+ memcpy(iter->node_map, map, sizeof(iter->node_map));
+ iter->curnode = -1;
+}
+
+static inline int dlm_node_iter_next(struct dlm_node_iter *iter)
+{
+ int bit;
+ bit = find_next_bit(iter->node_map, O2NM_MAX_NODES, iter->curnode+1);
+ if (bit >= O2NM_MAX_NODES) {
+ iter->curnode = O2NM_MAX_NODES;
+ return -ENOENT;
+ }
+ iter->curnode = bit;
+ return bit;
+}
+
+
+
+#endif /* DLMCOMMON_H */
--- /dev/null
+/* -*- mode: c; c-basic-offset: 8; -*-
+ * vim: noexpandtab sw=8 ts=8 sts=0:
+ *
+ * dlmconvert.c
+ *
+ * underlying calls for lock conversion
+ *
+ * Copyright (C) 2004 Oracle. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ *
+ */
+
+
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/highmem.h>
+#include <linux/utsname.h>
+#include <linux/init.h>
+#include <linux/sysctl.h>
+#include <linux/random.h>
+#include <linux/blkdev.h>
+#include <linux/socket.h>
+#include <linux/inet.h>
+#include <linux/spinlock.h>
+
+
+#include "cluster/heartbeat.h"
+#include "cluster/nodemanager.h"
+#include "cluster/tcp.h"
+
+#include "dlmapi.h"
+#include "dlmcommon.h"
+
+#include "dlmconvert.h"
+
+#define MLOG_MASK_PREFIX ML_DLM
+#include "cluster/masklog.h"
+
+/* NOTE: __dlmconvert_master is the only function in here that
+ * needs a spinlock held on entry (res->spinlock) and it is the
+ * only one that holds a lock on exit (res->spinlock).
+ * All other functions in here need no locks and drop all of
+ * the locks that they acquire. */
+static enum dlm_status __dlmconvert_master(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res,
+ struct dlm_lock *lock, int flags,
+ int type, int *call_ast,
+ int *kick_thread);
+static enum dlm_status dlm_send_remote_convert_request(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res,
+ struct dlm_lock *lock, int flags, int type);
+
+/*
+ * this is only called directly by dlmlock(), and only when the
+ * local node is the owner of the lockres
+ * locking:
+ * caller needs: none
+ * taken: takes and drops res->spinlock
+ * held on exit: none
+ * returns: see __dlmconvert_master
+ */
+enum dlm_status dlmconvert_master(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res,
+ struct dlm_lock *lock, int flags, int type)
+{
+ int call_ast = 0, kick_thread = 0;
+ enum dlm_status status;
+
+ spin_lock(&res->spinlock);
+ /* we are not in a network handler, this is fine */
+ __dlm_wait_on_lockres(res);
+ __dlm_lockres_reserve_ast(res);
+ res->state |= DLM_LOCK_RES_IN_PROGRESS;
+
+ status = __dlmconvert_master(dlm, res, lock, flags, type,
+ &call_ast, &kick_thread);
+
+ res->state &= ~DLM_LOCK_RES_IN_PROGRESS;
+ spin_unlock(&res->spinlock);
+ wake_up(&res->wq);
+ if (status != DLM_NORMAL && status != DLM_NOTQUEUED)
+ dlm_error(status);
+
+ /* either queue the ast or release it */
+ if (call_ast)
+ dlm_queue_ast(dlm, lock);
+ else
+ dlm_lockres_release_ast(dlm, res);
+
+ if (kick_thread)
+ dlm_kick_thread(dlm, res);
+
+ return status;
+}
+
+/* performs lock conversion at the lockres master site
+ * locking:
+ * caller needs: res->spinlock
+ * taken: takes and drops lock->spinlock
+ * held on exit: res->spinlock
+ * returns: DLM_NORMAL, DLM_NOTQUEUED, DLM_DENIED
+ * call_ast: whether ast should be called for this lock
+ * kick_thread: whether dlm_kick_thread should be called
+ */
+static enum dlm_status __dlmconvert_master(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res,
+ struct dlm_lock *lock, int flags,
+ int type, int *call_ast,
+ int *kick_thread)
+{
+ enum dlm_status status = DLM_NORMAL;
+ struct list_head *iter;
+ struct dlm_lock *tmplock=NULL;
+
+ assert_spin_locked(&res->spinlock);
+
+ mlog_entry("type=%d, convert_type=%d, new convert_type=%d\n",
+ lock->ml.type, lock->ml.convert_type, type);
+
+ spin_lock(&lock->spinlock);
+
+ /* already converting? */
+ if (lock->ml.convert_type != LKM_IVMODE) {
+ mlog(ML_ERROR, "attempted to convert a lock with a lock "
+ "conversion pending\n");
+ status = DLM_DENIED;
+ goto unlock_exit;
+ }
+
+ /* must be on grant queue to convert */
+ if (!dlm_lock_on_list(&res->granted, lock)) {
+ mlog(ML_ERROR, "attempted to convert a lock not on grant "
+ "queue\n");
+ status = DLM_DENIED;
+ goto unlock_exit;
+ }
+
+ if (flags & LKM_VALBLK) {
+ switch (lock->ml.type) {
+ case LKM_EXMODE:
+ /* EX + LKM_VALBLK + convert == set lvb */
+ mlog(0, "will set lvb: converting %s->%s\n",
+ dlm_lock_mode_name(lock->ml.type),
+ dlm_lock_mode_name(type));
+ lock->lksb->flags |= DLM_LKSB_PUT_LVB;
+ break;
+ case LKM_PRMODE:
+ case LKM_NLMODE:
+ /* refetch if new level is not NL */
+ if (type > LKM_NLMODE) {
+ mlog(0, "will fetch new value into "
+ "lvb: converting %s->%s\n",
+ dlm_lock_mode_name(lock->ml.type),
+ dlm_lock_mode_name(type));
+ lock->lksb->flags |= DLM_LKSB_GET_LVB;
+ } else {
+ mlog(0, "will NOT fetch new value "
+ "into lvb: converting %s->%s\n",
+ dlm_lock_mode_name(lock->ml.type),
+ dlm_lock_mode_name(type));
+ flags &= ~(LKM_VALBLK);
+ }
+ break;
+ }
+ }
+
+
+ /* in-place downconvert? */
+ if (type <= lock->ml.type)
+ goto grant;
+
+ /* upconvert from here on */
+ status = DLM_NORMAL;
+ list_for_each(iter, &res->granted) {
+ tmplock = list_entry(iter, struct dlm_lock, list);
+ if (tmplock == lock)
+ continue;
+ if (!dlm_lock_compatible(tmplock->ml.type, type))
+ goto switch_queues;
+ }
+
+ list_for_each(iter, &res->converting) {
+ tmplock = list_entry(iter, struct dlm_lock, list);
+ if (!dlm_lock_compatible(tmplock->ml.type, type))
+ goto switch_queues;
+ /* existing conversion requests take precedence */
+ if (!dlm_lock_compatible(tmplock->ml.convert_type, type))
+ goto switch_queues;
+ }
+
+ /* fall thru to grant */
+
+grant:
+ mlog(0, "res %.*s, granting %s lock\n", res->lockname.len,
+ res->lockname.name, dlm_lock_mode_name(type));
+ /* immediately grant the new lock type */
+ lock->lksb->status = DLM_NORMAL;
+ if (lock->ml.node == dlm->node_num)
+ mlog(0, "doing in-place convert for nonlocal lock\n");
+ lock->ml.type = type;
+ status = DLM_NORMAL;
+ *call_ast = 1;
+ goto unlock_exit;
+
+switch_queues:
+ if (flags & LKM_NOQUEUE) {
+ mlog(0, "failed to convert NOQUEUE lock %.*s from "
+ "%d to %d...\n", res->lockname.len, res->lockname.name,
+ lock->ml.type, type);
+ status = DLM_NOTQUEUED;
+ goto unlock_exit;
+ }
+ mlog(0, "res %.*s, queueing...\n", res->lockname.len,
+ res->lockname.name);
+
+ lock->ml.convert_type = type;
+ /* do not alter lock refcount. switching lists. */
+ list_del_init(&lock->list);
+ list_add_tail(&lock->list, &res->converting);
+
+unlock_exit:
+ spin_unlock(&lock->spinlock);
+ if (status == DLM_DENIED) {
+ __dlm_print_one_lock_resource(res);
+ }
+ if (status == DLM_NORMAL)
+ *kick_thread = 1;
+ return status;
+}
+
+void dlm_revert_pending_convert(struct dlm_lock_resource *res,
+ struct dlm_lock *lock)
+{
+ /* do not alter lock refcount. switching lists. */
+ list_del_init(&lock->list);
+ list_add_tail(&lock->list, &res->granted);
+ lock->ml.convert_type = LKM_IVMODE;
+ lock->lksb->flags &= ~(DLM_LKSB_GET_LVB|DLM_LKSB_PUT_LVB);
+}
+
+/* messages the master site to do lock conversion
+ * locking:
+ * caller needs: none
+ * taken: takes and drops res->spinlock, uses DLM_LOCK_RES_IN_PROGRESS
+ * held on exit: none
+ * returns: DLM_NORMAL, DLM_RECOVERING, status from remote node
+ */
+enum dlm_status dlmconvert_remote(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res,
+ struct dlm_lock *lock, int flags, int type)
+{
+ enum dlm_status status;
+
+ mlog(0, "type=%d, convert_type=%d, busy=%d\n", lock->ml.type,
+ lock->ml.convert_type, res->state & DLM_LOCK_RES_IN_PROGRESS);
+
+ spin_lock(&res->spinlock);
+ if (res->state & DLM_LOCK_RES_RECOVERING) {
+ mlog(0, "bailing out early since res is RECOVERING "
+ "on secondary queue\n");
+ /* __dlm_print_one_lock_resource(res); */
+ status = DLM_RECOVERING;
+ goto bail;
+ }
+ /* will exit this call with spinlock held */
+ __dlm_wait_on_lockres(res);
+
+ if (lock->ml.convert_type != LKM_IVMODE) {
+ __dlm_print_one_lock_resource(res);
+ mlog(ML_ERROR, "converting a remote lock that is already "
+ "converting! (cookie=%"MLFu64", conv=%d)\n",
+ lock->ml.cookie, lock->ml.convert_type);
+ status = DLM_DENIED;
+ goto bail;
+ }
+ res->state |= DLM_LOCK_RES_IN_PROGRESS;
+ /* move lock to local convert queue */
+ /* do not alter lock refcount. switching lists. */
+ list_del_init(&lock->list);
+ list_add_tail(&lock->list, &res->converting);
+ lock->convert_pending = 1;
+ lock->ml.convert_type = type;
+
+ if (flags & LKM_VALBLK) {
+ if (lock->ml.type == LKM_EXMODE) {
+ flags |= LKM_PUT_LVB;
+ lock->lksb->flags |= DLM_LKSB_PUT_LVB;
+ } else {
+ if (lock->ml.convert_type == LKM_NLMODE)
+ flags &= ~LKM_VALBLK;
+ else {
+ flags |= LKM_GET_LVB;
+ lock->lksb->flags |= DLM_LKSB_GET_LVB;
+ }
+ }
+ }
+ spin_unlock(&res->spinlock);
+
+ /* no locks held here.
+ * need to wait for a reply as to whether it got queued or not. */
+ status = dlm_send_remote_convert_request(dlm, res, lock, flags, type);
+
+ spin_lock(&res->spinlock);
+ res->state &= ~DLM_LOCK_RES_IN_PROGRESS;
+ lock->convert_pending = 0;
+ /* if it failed, move it back to granted queue */
+ if (status != DLM_NORMAL) {
+ if (status != DLM_NOTQUEUED)
+ dlm_error(status);
+ dlm_revert_pending_convert(res, lock);
+ }
+bail:
+ spin_unlock(&res->spinlock);
+
+ /* TODO: should this be a wake_one? */
+ /* wake up any IN_PROGRESS waiters */
+ wake_up(&res->wq);
+
+ return status;
+}
+
+/* sends DLM_CONVERT_LOCK_MSG to master site
+ * locking:
+ * caller needs: none
+ * taken: none
+ * held on exit: none
+ * returns: DLM_NOLOCKMGR, status from remote node
+ */
+static enum dlm_status dlm_send_remote_convert_request(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res,
+ struct dlm_lock *lock, int flags, int type)
+{
+ struct dlm_convert_lock convert;
+ int tmpret;
+ enum dlm_status ret;
+ int status = 0;
+ struct kvec vec[2];
+ size_t veclen = 1;
+
+ mlog_entry("%.*s\n", res->lockname.len, res->lockname.name);
+
+ memset(&convert, 0, sizeof(struct dlm_convert_lock));
+ convert.node_idx = dlm->node_num;
+ convert.requested_type = type;
+ convert.cookie = lock->ml.cookie;
+ convert.namelen = res->lockname.len;
+ convert.flags = cpu_to_be32(flags);
+ memcpy(convert.name, res->lockname.name, convert.namelen);
+
+ vec[0].iov_len = sizeof(struct dlm_convert_lock);
+ vec[0].iov_base = &convert;
+
+ if (flags & LKM_PUT_LVB) {
+ /* extra data to send if we are updating lvb */
+ vec[1].iov_len = DLM_LVB_LEN;
+ vec[1].iov_base = lock->lksb->lvb;
+ veclen++;
+ }
+
+ tmpret = o2net_send_message_vec(DLM_CONVERT_LOCK_MSG, dlm->key,
+ vec, veclen, res->owner, &status);
+ if (tmpret >= 0) {
+ // successfully sent and received
+ ret = status; // this is already a dlm_status
+ if (ret == DLM_RECOVERING) {
+ mlog(0, "node %u returned DLM_RECOVERING from convert "
+ "message!\n", res->owner);
+ } else if (ret == DLM_MIGRATING) {
+ mlog(0, "node %u returned DLM_MIGRATING from convert "
+ "message!\n", res->owner);
+ } else if (ret == DLM_FORWARD) {
+ mlog(0, "node %u returned DLM_FORWARD from convert "
+ "message!\n", res->owner);
+ } else if (ret != DLM_NORMAL && ret != DLM_NOTQUEUED)
+ dlm_error(ret);
+ } else {
+ mlog_errno(tmpret);
+ if (dlm_is_host_down(tmpret)) {
+ ret = DLM_RECOVERING;
+ mlog(0, "node %u died so returning DLM_RECOVERING "
+ "from convert message!\n", res->owner);
+ } else {
+ ret = dlm_err_to_dlm_status(tmpret);
+ }
+ }
+
+ return ret;
+}
+
+/* handler for DLM_CONVERT_LOCK_MSG on master site
+ * locking:
+ * caller needs: none
+ * taken: takes and drop res->spinlock
+ * held on exit: none
+ * returns: DLM_NORMAL, DLM_IVLOCKID, DLM_BADARGS,
+ * status from __dlmconvert_master
+ */
+int dlm_convert_lock_handler(struct o2net_msg *msg, u32 len, void *data)
+{
+ struct dlm_ctxt *dlm = data;
+ struct dlm_convert_lock *cnv = (struct dlm_convert_lock *)msg->buf;
+ struct dlm_lock_resource *res = NULL;
+ struct list_head *iter;
+ struct dlm_lock *lock = NULL;
+ struct dlm_lockstatus *lksb;
+ enum dlm_status status = DLM_NORMAL;
+ u32 flags;
+ int call_ast = 0, kick_thread = 0;
+
+ if (!dlm_grab(dlm)) {
+ dlm_error(DLM_REJECTED);
+ return DLM_REJECTED;
+ }
+
+ mlog_bug_on_msg(!dlm_domain_fully_joined(dlm),
+ "Domain %s not fully joined!\n", dlm->name);
+
+ if (cnv->namelen > DLM_LOCKID_NAME_MAX) {
+ status = DLM_IVBUFLEN;
+ dlm_error(status);
+ goto leave;
+ }
+
+ flags = be32_to_cpu(cnv->flags);
+
+ if ((flags & (LKM_PUT_LVB|LKM_GET_LVB)) ==
+ (LKM_PUT_LVB|LKM_GET_LVB)) {
+ mlog(ML_ERROR, "both PUT and GET lvb specified\n");
+ status = DLM_BADARGS;
+ goto leave;
+ }
+
+ mlog(0, "lvb: %s\n", flags & LKM_PUT_LVB ? "put lvb" :
+ (flags & LKM_GET_LVB ? "get lvb" : "none"));
+
+ status = DLM_IVLOCKID;
+ res = dlm_lookup_lockres(dlm, cnv->name, cnv->namelen);
+ if (!res) {
+ dlm_error(status);
+ goto leave;
+ }
+
+ spin_lock(&res->spinlock);
+ list_for_each(iter, &res->granted) {
+ lock = list_entry(iter, struct dlm_lock, list);
+ if (lock->ml.cookie == cnv->cookie &&
+ lock->ml.node == cnv->node_idx) {
+ dlm_lock_get(lock);
+ break;
+ }
+ lock = NULL;
+ }
+ spin_unlock(&res->spinlock);
+ if (!lock) {
+ status = DLM_IVLOCKID;
+ dlm_error(status);
+ goto leave;
+ }
+
+ /* found the lock */
+ lksb = lock->lksb;
+
+ /* see if caller needed to get/put lvb */
+ if (flags & LKM_PUT_LVB) {
+ BUG_ON(lksb->flags & (DLM_LKSB_PUT_LVB|DLM_LKSB_GET_LVB));
+ lksb->flags |= DLM_LKSB_PUT_LVB;
+ memcpy(&lksb->lvb[0], &cnv->lvb[0], DLM_LVB_LEN);
+ } else if (flags & LKM_GET_LVB) {
+ BUG_ON(lksb->flags & (DLM_LKSB_PUT_LVB|DLM_LKSB_GET_LVB));
+ lksb->flags |= DLM_LKSB_GET_LVB;
+ }
+
+ spin_lock(&res->spinlock);
+ status = __dlm_lockres_state_to_status(res);
+ if (status == DLM_NORMAL) {
+ __dlm_lockres_reserve_ast(res);
+ res->state |= DLM_LOCK_RES_IN_PROGRESS;
+ status = __dlmconvert_master(dlm, res, lock, flags,
+ cnv->requested_type,
+ &call_ast, &kick_thread);
+ res->state &= ~DLM_LOCK_RES_IN_PROGRESS;
+ }
+ spin_unlock(&res->spinlock);
+
+ if (status != DLM_NORMAL) {
+ if (status != DLM_NOTQUEUED)
+ dlm_error(status);
+ lksb->flags &= ~(DLM_LKSB_GET_LVB|DLM_LKSB_PUT_LVB);
+ }
+
+leave:
+ if (!lock)
+ mlog(ML_ERROR, "did not find lock to convert on grant queue! "
+ "cookie=%"MLFu64"\n",
+ cnv->cookie);
+ else
+ dlm_lock_put(lock);
+
+ /* either queue the ast or release it */
+ if (call_ast)
+ dlm_queue_ast(dlm, lock);
+ else
+ dlm_lockres_release_ast(dlm, res);
+
+ if (kick_thread)
+ dlm_kick_thread(dlm, res);
+
+ if (res)
+ dlm_lockres_put(res);
+
+ dlm_put(dlm);
+
+ return status;
+}
--- /dev/null
+/* -*- mode: c; c-basic-offset: 8; -*-
+ * vim: noexpandtab sw=8 ts=8 sts=0:
+ *
+ * dlmconvert.h
+ *
+ * Copyright (C) 2004 Oracle. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ *
+ */
+
+#ifndef DLMCONVERT_H
+#define DLMCONVERT_H
+
+enum dlm_status dlmconvert_master(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res,
+ struct dlm_lock *lock, int flags, int type);
+enum dlm_status dlmconvert_remote(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res,
+ struct dlm_lock *lock, int flags, int type);
+
+#endif
--- /dev/null
+/* -*- mode: c; c-basic-offset: 8; -*-
+ * vim: noexpandtab sw=8 ts=8 sts=0:
+ *
+ * dlmdebug.c
+ *
+ * debug functionality for the dlm
+ *
+ * Copyright (C) 2004 Oracle. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ *
+ */
+
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/highmem.h>
+#include <linux/utsname.h>
+#include <linux/sysctl.h>
+#include <linux/spinlock.h>
+
+#include "cluster/heartbeat.h"
+#include "cluster/nodemanager.h"
+#include "cluster/tcp.h"
+
+#include "dlmapi.h"
+#include "dlmcommon.h"
+#include "dlmdebug.h"
+
+#include "dlmdomain.h"
+#include "dlmdebug.h"
+
+#define MLOG_MASK_PREFIX ML_DLM
+#include "cluster/masklog.h"
+
+void dlm_print_one_lock_resource(struct dlm_lock_resource *res)
+{
+ mlog(ML_NOTICE, "lockres: %.*s, owner=%u, state=%u\n",
+ res->lockname.len, res->lockname.name,
+ res->owner, res->state);
+ spin_lock(&res->spinlock);
+ __dlm_print_one_lock_resource(res);
+ spin_unlock(&res->spinlock);
+}
+
+void __dlm_print_one_lock_resource(struct dlm_lock_resource *res)
+{
+ struct list_head *iter2;
+ struct dlm_lock *lock;
+
+ assert_spin_locked(&res->spinlock);
+
+ mlog(ML_NOTICE, "lockres: %.*s, owner=%u, state=%u\n",
+ res->lockname.len, res->lockname.name,
+ res->owner, res->state);
+ mlog(ML_NOTICE, " last used: %lu, on purge list: %s\n",
+ res->last_used, list_empty(&res->purge) ? "no" : "yes");
+ mlog(ML_NOTICE, " granted queue: \n");
+ list_for_each(iter2, &res->granted) {
+ lock = list_entry(iter2, struct dlm_lock, list);
+ spin_lock(&lock->spinlock);
+ mlog(ML_NOTICE, " type=%d, conv=%d, node=%u, "
+ "cookie=%"MLFu64", ast=(empty=%c,pend=%c), bast=(empty=%c,pend=%c)\n",
+ lock->ml.type, lock->ml.convert_type, lock->ml.node, lock->ml.cookie,
+ list_empty(&lock->ast_list) ? 'y' : 'n',
+ lock->ast_pending ? 'y' : 'n',
+ list_empty(&lock->bast_list) ? 'y' : 'n',
+ lock->bast_pending ? 'y' : 'n');
+ spin_unlock(&lock->spinlock);
+ }
+ mlog(ML_NOTICE, " converting queue: \n");
+ list_for_each(iter2, &res->converting) {
+ lock = list_entry(iter2, struct dlm_lock, list);
+ spin_lock(&lock->spinlock);
+ mlog(ML_NOTICE, " type=%d, conv=%d, node=%u, "
+ "cookie=%"MLFu64", ast=(empty=%c,pend=%c), bast=(empty=%c,pend=%c)\n",
+ lock->ml.type, lock->ml.convert_type, lock->ml.node, lock->ml.cookie,
+ list_empty(&lock->ast_list) ? 'y' : 'n',
+ lock->ast_pending ? 'y' : 'n',
+ list_empty(&lock->bast_list) ? 'y' : 'n',
+ lock->bast_pending ? 'y' : 'n');
+ spin_unlock(&lock->spinlock);
+ }
+ mlog(ML_NOTICE, " blocked queue: \n");
+ list_for_each(iter2, &res->blocked) {
+ lock = list_entry(iter2, struct dlm_lock, list);
+ spin_lock(&lock->spinlock);
+ mlog(ML_NOTICE, " type=%d, conv=%d, node=%u, "
+ "cookie=%"MLFu64", ast=(empty=%c,pend=%c), bast=(empty=%c,pend=%c)\n",
+ lock->ml.type, lock->ml.convert_type, lock->ml.node, lock->ml.cookie,
+ list_empty(&lock->ast_list) ? 'y' : 'n',
+ lock->ast_pending ? 'y' : 'n',
+ list_empty(&lock->bast_list) ? 'y' : 'n',
+ lock->bast_pending ? 'y' : 'n');
+ spin_unlock(&lock->spinlock);
+ }
+}
+
+void dlm_print_one_lock(struct dlm_lock *lockid)
+{
+ dlm_print_one_lock_resource(lockid->lockres);
+}
+EXPORT_SYMBOL_GPL(dlm_print_one_lock);
+
+void dlm_dump_lock_resources(struct dlm_ctxt *dlm)
+{
+ struct dlm_lock_resource *res;
+ struct list_head *iter;
+ struct list_head *bucket;
+ int i;
+
+ mlog(ML_NOTICE, "struct dlm_ctxt: %s, node=%u, key=%u\n",
+ dlm->name, dlm->node_num, dlm->key);
+ if (!dlm || !dlm->name) {
+ mlog(ML_ERROR, "dlm=%p\n", dlm);
+ return;
+ }
+
+ spin_lock(&dlm->spinlock);
+ for (i=0; i<DLM_HASH_SIZE; i++) {
+ bucket = &(dlm->resources[i]);
+ list_for_each(iter, bucket) {
+ res = list_entry(iter, struct dlm_lock_resource, list);
+ dlm_print_one_lock_resource(res);
+ }
+ }
+ spin_unlock(&dlm->spinlock);
+}
+
+static const char *dlm_errnames[] = {
+ [DLM_NORMAL] = "DLM_NORMAL",
+ [DLM_GRANTED] = "DLM_GRANTED",
+ [DLM_DENIED] = "DLM_DENIED",
+ [DLM_DENIED_NOLOCKS] = "DLM_DENIED_NOLOCKS",
+ [DLM_WORKING] = "DLM_WORKING",
+ [DLM_BLOCKED] = "DLM_BLOCKED",
+ [DLM_BLOCKED_ORPHAN] = "DLM_BLOCKED_ORPHAN",
+ [DLM_DENIED_GRACE_PERIOD] = "DLM_DENIED_GRACE_PERIOD",
+ [DLM_SYSERR] = "DLM_SYSERR",
+ [DLM_NOSUPPORT] = "DLM_NOSUPPORT",
+ [DLM_CANCELGRANT] = "DLM_CANCELGRANT",
+ [DLM_IVLOCKID] = "DLM_IVLOCKID",
+ [DLM_SYNC] = "DLM_SYNC",
+ [DLM_BADTYPE] = "DLM_BADTYPE",
+ [DLM_BADRESOURCE] = "DLM_BADRESOURCE",
+ [DLM_MAXHANDLES] = "DLM_MAXHANDLES",
+ [DLM_NOCLINFO] = "DLM_NOCLINFO",
+ [DLM_NOLOCKMGR] = "DLM_NOLOCKMGR",
+ [DLM_NOPURGED] = "DLM_NOPURGED",
+ [DLM_BADARGS] = "DLM_BADARGS",
+ [DLM_VOID] = "DLM_VOID",
+ [DLM_NOTQUEUED] = "DLM_NOTQUEUED",
+ [DLM_IVBUFLEN] = "DLM_IVBUFLEN",
+ [DLM_CVTUNGRANT] = "DLM_CVTUNGRANT",
+ [DLM_BADPARAM] = "DLM_BADPARAM",
+ [DLM_VALNOTVALID] = "DLM_VALNOTVALID",
+ [DLM_REJECTED] = "DLM_REJECTED",
+ [DLM_ABORT] = "DLM_ABORT",
+ [DLM_CANCEL] = "DLM_CANCEL",
+ [DLM_IVRESHANDLE] = "DLM_IVRESHANDLE",
+ [DLM_DEADLOCK] = "DLM_DEADLOCK",
+ [DLM_DENIED_NOASTS] = "DLM_DENIED_NOASTS",
+ [DLM_FORWARD] = "DLM_FORWARD",
+ [DLM_TIMEOUT] = "DLM_TIMEOUT",
+ [DLM_IVGROUPID] = "DLM_IVGROUPID",
+ [DLM_VERS_CONFLICT] = "DLM_VERS_CONFLICT",
+ [DLM_BAD_DEVICE_PATH] = "DLM_BAD_DEVICE_PATH",
+ [DLM_NO_DEVICE_PERMISSION] = "DLM_NO_DEVICE_PERMISSION",
+ [DLM_NO_CONTROL_DEVICE ] = "DLM_NO_CONTROL_DEVICE ",
+ [DLM_RECOVERING] = "DLM_RECOVERING",
+ [DLM_MIGRATING] = "DLM_MIGRATING",
+ [DLM_MAXSTATS] = "DLM_MAXSTATS",
+};
+
+static const char *dlm_errmsgs[] = {
+ [DLM_NORMAL] = "request in progress",
+ [DLM_GRANTED] = "request granted",
+ [DLM_DENIED] = "request denied",
+ [DLM_DENIED_NOLOCKS] = "request denied, out of system resources",
+ [DLM_WORKING] = "async request in progress",
+ [DLM_BLOCKED] = "lock request blocked",
+ [DLM_BLOCKED_ORPHAN] = "lock request blocked by a orphan lock",
+ [DLM_DENIED_GRACE_PERIOD] = "topological change in progress",
+ [DLM_SYSERR] = "system error",
+ [DLM_NOSUPPORT] = "unsupported",
+ [DLM_CANCELGRANT] = "can't cancel convert: already granted",
+ [DLM_IVLOCKID] = "bad lockid",
+ [DLM_SYNC] = "synchronous request granted",
+ [DLM_BADTYPE] = "bad resource type",
+ [DLM_BADRESOURCE] = "bad resource handle",
+ [DLM_MAXHANDLES] = "no more resource handles",
+ [DLM_NOCLINFO] = "can't contact cluster manager",
+ [DLM_NOLOCKMGR] = "can't contact lock manager",
+ [DLM_NOPURGED] = "can't contact purge daemon",
+ [DLM_BADARGS] = "bad api args",
+ [DLM_VOID] = "no status",
+ [DLM_NOTQUEUED] = "NOQUEUE was specified and request failed",
+ [DLM_IVBUFLEN] = "invalid resource name length",
+ [DLM_CVTUNGRANT] = "attempted to convert ungranted lock",
+ [DLM_BADPARAM] = "invalid lock mode specified",
+ [DLM_VALNOTVALID] = "value block has been invalidated",
+ [DLM_REJECTED] = "request rejected, unrecognized client",
+ [DLM_ABORT] = "blocked lock request cancelled",
+ [DLM_CANCEL] = "conversion request cancelled",
+ [DLM_IVRESHANDLE] = "invalid resource handle",
+ [DLM_DEADLOCK] = "deadlock recovery refused this request",
+ [DLM_DENIED_NOASTS] = "failed to allocate AST",
+ [DLM_FORWARD] = "request must wait for primary's response",
+ [DLM_TIMEOUT] = "timeout value for lock has expired",
+ [DLM_IVGROUPID] = "invalid group specification",
+ [DLM_VERS_CONFLICT] = "version conflicts prevent request handling",
+ [DLM_BAD_DEVICE_PATH] = "Locks device does not exist or path wrong",
+ [DLM_NO_DEVICE_PERMISSION] = "Client has insufficient perms for device",
+ [DLM_NO_CONTROL_DEVICE] = "Cannot set options on opened device ",
+ [DLM_RECOVERING] = "lock resource being recovered",
+ [DLM_MIGRATING] = "lock resource being migrated",
+ [DLM_MAXSTATS] = "invalid error number",
+};
+
+const char *dlm_errmsg(enum dlm_status err)
+{
+ if (err >= DLM_MAXSTATS || err < 0)
+ return dlm_errmsgs[DLM_MAXSTATS];
+ return dlm_errmsgs[err];
+}
+EXPORT_SYMBOL_GPL(dlm_errmsg);
+
+const char *dlm_errname(enum dlm_status err)
+{
+ if (err >= DLM_MAXSTATS || err < 0)
+ return dlm_errnames[DLM_MAXSTATS];
+ return dlm_errnames[err];
+}
+EXPORT_SYMBOL_GPL(dlm_errname);
--- /dev/null
+/* -*- mode: c; c-basic-offset: 8; -*-
+ * vim: noexpandtab sw=8 ts=8 sts=0:
+ *
+ * dlmdebug.h
+ *
+ * Copyright (C) 2004 Oracle. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ *
+ */
+
+#ifndef DLMDEBUG_H
+#define DLMDEBUG_H
+
+void dlm_dump_lock_resources(struct dlm_ctxt *dlm);
+
+#endif
--- /dev/null
+/* -*- mode: c; c-basic-offset: 8; -*-
+ * vim: noexpandtab sw=8 ts=8 sts=0:
+ *
+ * dlmdomain.c
+ *
+ * defines domain join / leave apis
+ *
+ * Copyright (C) 2004 Oracle. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/highmem.h>
+#include <linux/utsname.h>
+#include <linux/init.h>
+#include <linux/spinlock.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+
+#include "cluster/heartbeat.h"
+#include "cluster/nodemanager.h"
+#include "cluster/tcp.h"
+
+#include "dlmapi.h"
+#include "dlmcommon.h"
+
+#include "dlmdebug.h"
+#include "dlmdomain.h"
+
+#include "dlmver.h"
+
+#define MLOG_MASK_PREFIX (ML_DLM|ML_DLM_DOMAIN)
+#include "cluster/masklog.h"
+
+/*
+ *
+ * spinlock lock ordering: if multiple locks are needed, obey this ordering:
+ * dlm_domain_lock
+ * struct dlm_ctxt->spinlock
+ * struct dlm_lock_resource->spinlock
+ * struct dlm_ctxt->master_lock
+ * struct dlm_ctxt->ast_lock
+ * dlm_master_list_entry->spinlock
+ * dlm_lock->spinlock
+ *
+ */
+
+spinlock_t dlm_domain_lock = SPIN_LOCK_UNLOCKED;
+LIST_HEAD(dlm_domains);
+static DECLARE_WAIT_QUEUE_HEAD(dlm_domain_events);
+
+#define DLM_DOMAIN_BACKOFF_MS 200
+
+static int dlm_query_join_handler(struct o2net_msg *msg, u32 len, void *data);
+static int dlm_assert_joined_handler(struct o2net_msg *msg, u32 len, void *data);
+static int dlm_cancel_join_handler(struct o2net_msg *msg, u32 len, void *data);
+static int dlm_exit_domain_handler(struct o2net_msg *msg, u32 len, void *data);
+
+static void dlm_unregister_domain_handlers(struct dlm_ctxt *dlm);
+
+void __dlm_unhash_lockres(struct dlm_lock_resource *lockres)
+{
+ list_del_init(&lockres->list);
+ dlm_lockres_put(lockres);
+}
+
+void __dlm_insert_lockres(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res)
+{
+ struct list_head *bucket;
+ struct qstr *q;
+
+ assert_spin_locked(&dlm->spinlock);
+
+ q = &res->lockname;
+ q->hash = full_name_hash(q->name, q->len);
+ bucket = &(dlm->resources[q->hash & DLM_HASH_MASK]);
+
+ /* get a reference for our hashtable */
+ dlm_lockres_get(res);
+
+ list_add_tail(&res->list, bucket);
+}
+
+struct dlm_lock_resource * __dlm_lookup_lockres(struct dlm_ctxt *dlm,
+ const char *name,
+ unsigned int len)
+{
+ unsigned int hash;
+ struct list_head *iter;
+ struct dlm_lock_resource *tmpres=NULL;
+ struct list_head *bucket;
+
+ mlog_entry("%.*s\n", len, name);
+
+ assert_spin_locked(&dlm->spinlock);
+
+ hash = full_name_hash(name, len);
+
+ bucket = &(dlm->resources[hash & DLM_HASH_MASK]);
+
+ /* check for pre-existing lock */
+ list_for_each(iter, bucket) {
+ tmpres = list_entry(iter, struct dlm_lock_resource, list);
+ if (tmpres->lockname.len == len &&
+ memcmp(tmpres->lockname.name, name, len) == 0) {
+ dlm_lockres_get(tmpres);
+ break;
+ }
+
+ tmpres = NULL;
+ }
+ return tmpres;
+}
+
+struct dlm_lock_resource * dlm_lookup_lockres(struct dlm_ctxt *dlm,
+ const char *name,
+ unsigned int len)
+{
+ struct dlm_lock_resource *res;
+
+ spin_lock(&dlm->spinlock);
+ res = __dlm_lookup_lockres(dlm, name, len);
+ spin_unlock(&dlm->spinlock);
+ return res;
+}
+
+static struct dlm_ctxt * __dlm_lookup_domain_full(const char *domain, int len)
+{
+ struct dlm_ctxt *tmp = NULL;
+ struct list_head *iter;
+
+ assert_spin_locked(&dlm_domain_lock);
+
+ /* tmp->name here is always NULL terminated,
+ * but domain may not be! */
+ list_for_each(iter, &dlm_domains) {
+ tmp = list_entry (iter, struct dlm_ctxt, list);
+ if (strlen(tmp->name) == len &&
+ memcmp(tmp->name, domain, len)==0)
+ break;
+ tmp = NULL;
+ }
+
+ return tmp;
+}
+
+/* For null terminated domain strings ONLY */
+static struct dlm_ctxt * __dlm_lookup_domain(const char *domain)
+{
+ assert_spin_locked(&dlm_domain_lock);
+
+ return __dlm_lookup_domain_full(domain, strlen(domain));
+}
+
+
+/* returns true on one of two conditions:
+ * 1) the domain does not exist
+ * 2) the domain exists and it's state is "joined" */
+static int dlm_wait_on_domain_helper(const char *domain)
+{
+ int ret = 0;
+ struct dlm_ctxt *tmp = NULL;
+
+ spin_lock(&dlm_domain_lock);
+
+ tmp = __dlm_lookup_domain(domain);
+ if (!tmp)
+ ret = 1;
+ else if (tmp->dlm_state == DLM_CTXT_JOINED)
+ ret = 1;
+
+ spin_unlock(&dlm_domain_lock);
+ return ret;
+}
+
+static void dlm_free_ctxt_mem(struct dlm_ctxt *dlm)
+{
+ if (dlm->resources)
+ free_page((unsigned long) dlm->resources);
+
+ if (dlm->name)
+ kfree(dlm->name);
+
+ kfree(dlm);
+}
+
+/* A little strange - this function will be called while holding
+ * dlm_domain_lock and is expected to be holding it on the way out. We
+ * will however drop and reacquire it multiple times */
+static void dlm_ctxt_release(struct kref *kref)
+{
+ struct dlm_ctxt *dlm;
+
+ dlm = container_of(kref, struct dlm_ctxt, dlm_refs);
+
+ BUG_ON(dlm->num_joins);
+ BUG_ON(dlm->dlm_state == DLM_CTXT_JOINED);
+
+ /* we may still be in the list if we hit an error during join. */
+ list_del_init(&dlm->list);
+
+ spin_unlock(&dlm_domain_lock);
+
+ mlog(0, "freeing memory from domain %s\n", dlm->name);
+
+ wake_up(&dlm_domain_events);
+
+ dlm_free_ctxt_mem(dlm);
+
+ spin_lock(&dlm_domain_lock);
+}
+
+void dlm_put(struct dlm_ctxt *dlm)
+{
+ spin_lock(&dlm_domain_lock);
+ kref_put(&dlm->dlm_refs, dlm_ctxt_release);
+ spin_unlock(&dlm_domain_lock);
+}
+
+static void __dlm_get(struct dlm_ctxt *dlm)
+{
+ kref_get(&dlm->dlm_refs);
+}
+
+/* given a questionable reference to a dlm object, gets a reference if
+ * it can find it in the list, otherwise returns NULL in which case
+ * you shouldn't trust your pointer. */
+struct dlm_ctxt *dlm_grab(struct dlm_ctxt *dlm)
+{
+ struct list_head *iter;
+ struct dlm_ctxt *target = NULL;
+
+ spin_lock(&dlm_domain_lock);
+
+ list_for_each(iter, &dlm_domains) {
+ target = list_entry (iter, struct dlm_ctxt, list);
+
+ if (target == dlm) {
+ __dlm_get(target);
+ break;
+ }
+
+ target = NULL;
+ }
+
+ spin_unlock(&dlm_domain_lock);
+
+ return target;
+}
+
+int dlm_domain_fully_joined(struct dlm_ctxt *dlm)
+{
+ int ret;
+
+ spin_lock(&dlm_domain_lock);
+ ret = (dlm->dlm_state == DLM_CTXT_JOINED) ||
+ (dlm->dlm_state == DLM_CTXT_IN_SHUTDOWN);
+ spin_unlock(&dlm_domain_lock);
+
+ return ret;
+}
+
+static void dlm_complete_dlm_shutdown(struct dlm_ctxt *dlm)
+{
+ dlm_unregister_domain_handlers(dlm);
+ dlm_complete_thread(dlm);
+ dlm_complete_recovery_thread(dlm);
+
+ /* We've left the domain. Now we can take ourselves out of the
+ * list and allow the kref stuff to help us free the
+ * memory. */
+ spin_lock(&dlm_domain_lock);
+ list_del_init(&dlm->list);
+ spin_unlock(&dlm_domain_lock);
+
+ /* Wake up anyone waiting for us to remove this domain */
+ wake_up(&dlm_domain_events);
+}
+
+static void dlm_migrate_all_locks(struct dlm_ctxt *dlm)
+{
+ int i;
+ struct dlm_lock_resource *res;
+
+ mlog(0, "Migrating locks from domain %s\n", dlm->name);
+restart:
+ spin_lock(&dlm->spinlock);
+ for (i=0; i<DLM_HASH_SIZE; i++) {
+ while (!list_empty(&dlm->resources[i])) {
+ res = list_entry(dlm->resources[i].next,
+ struct dlm_lock_resource, list);
+ /* need reference when manually grabbing lockres */
+ dlm_lockres_get(res);
+ /* this should unhash the lockres
+ * and exit with dlm->spinlock */
+ mlog(0, "purging res=%p\n", res);
+ if (dlm_lockres_is_dirty(dlm, res)) {
+ /* HACK! this should absolutely go.
+ * need to figure out why some empty
+ * lockreses are still marked dirty */
+ mlog(ML_ERROR, "lockres %.*s dirty!\n",
+ res->lockname.len, res->lockname.name);
+
+ spin_unlock(&dlm->spinlock);
+ dlm_kick_thread(dlm, res);
+ wait_event(dlm->ast_wq, !dlm_lockres_is_dirty(dlm, res));
+ dlm_lockres_put(res);
+ goto restart;
+ }
+ dlm_purge_lockres(dlm, res);
+ dlm_lockres_put(res);
+ }
+ }
+ spin_unlock(&dlm->spinlock);
+
+ mlog(0, "DONE Migrating locks from domain %s\n", dlm->name);
+}
+
+static int dlm_no_joining_node(struct dlm_ctxt *dlm)
+{
+ int ret;
+
+ spin_lock(&dlm->spinlock);
+ ret = dlm->joining_node == DLM_LOCK_RES_OWNER_UNKNOWN;
+ spin_unlock(&dlm->spinlock);
+
+ return ret;
+}
+
+static void dlm_mark_domain_leaving(struct dlm_ctxt *dlm)
+{
+ /* Yikes, a double spinlock! I need domain_lock for the dlm
+ * state and the dlm spinlock for join state... Sorry! */
+again:
+ spin_lock(&dlm_domain_lock);
+ spin_lock(&dlm->spinlock);
+
+ if (dlm->joining_node != DLM_LOCK_RES_OWNER_UNKNOWN) {
+ mlog(0, "Node %d is joining, we wait on it.\n",
+ dlm->joining_node);
+ spin_unlock(&dlm->spinlock);
+ spin_unlock(&dlm_domain_lock);
+
+ wait_event(dlm->dlm_join_events, dlm_no_joining_node(dlm));
+ goto again;
+ }
+
+ dlm->dlm_state = DLM_CTXT_LEAVING;
+ spin_unlock(&dlm->spinlock);
+ spin_unlock(&dlm_domain_lock);
+}
+
+static void __dlm_print_nodes(struct dlm_ctxt *dlm)
+{
+ int node = -1;
+
+ assert_spin_locked(&dlm->spinlock);
+
+ mlog(ML_NOTICE, "Nodes in my domain (\"%s\"):\n", dlm->name);
+
+ while ((node = find_next_bit(dlm->domain_map, O2NM_MAX_NODES,
+ node + 1)) < O2NM_MAX_NODES) {
+ mlog(ML_NOTICE, " node %d\n", node);
+ }
+}
+
+static int dlm_exit_domain_handler(struct o2net_msg *msg, u32 len, void *data)
+{
+ struct dlm_ctxt *dlm = data;
+ unsigned int node;
+ struct dlm_exit_domain *exit_msg = (struct dlm_exit_domain *) msg->buf;
+
+ mlog_entry("%p %u %p", msg, len, data);
+
+ if (!dlm_grab(dlm))
+ return 0;
+
+ node = exit_msg->node_idx;
+
+ mlog(0, "Node %u leaves domain %s\n", node, dlm->name);
+
+ spin_lock(&dlm->spinlock);
+ clear_bit(node, dlm->domain_map);
+ __dlm_print_nodes(dlm);
+
+ /* notify anything attached to the heartbeat events */
+ dlm_hb_event_notify_attached(dlm, node, 0);
+
+ spin_unlock(&dlm->spinlock);
+
+ dlm_put(dlm);
+
+ return 0;
+}
+
+static int dlm_send_one_domain_exit(struct dlm_ctxt *dlm,
+ unsigned int node)
+{
+ int status;
+ struct dlm_exit_domain leave_msg;
+
+ mlog(0, "Asking node %u if we can leave the domain %s me = %u\n",
+ node, dlm->name, dlm->node_num);
+
+ memset(&leave_msg, 0, sizeof(leave_msg));
+ leave_msg.node_idx = dlm->node_num;
+
+ status = o2net_send_message(DLM_EXIT_DOMAIN_MSG, dlm->key,
+ &leave_msg, sizeof(leave_msg), node,
+ NULL);
+
+ mlog(0, "status return %d from o2net_send_message\n", status);
+
+ return status;
+}
+
+
+static void dlm_leave_domain(struct dlm_ctxt *dlm)
+{
+ int node, clear_node, status;
+
+ /* At this point we've migrated away all our locks and won't
+ * accept mastership of new ones. The dlm is responsible for
+ * almost nothing now. We make sure not to confuse any joining
+ * nodes and then commence shutdown procedure. */
+
+ spin_lock(&dlm->spinlock);
+ /* Clear ourselves from the domain map */
+ clear_bit(dlm->node_num, dlm->domain_map);
+ while ((node = find_next_bit(dlm->domain_map, O2NM_MAX_NODES,
+ 0)) < O2NM_MAX_NODES) {
+ /* Drop the dlm spinlock. This is safe wrt the domain_map.
+ * -nodes cannot be added now as the
+ * query_join_handlers knows to respond with OK_NO_MAP
+ * -we catch the right network errors if a node is
+ * removed from the map while we're sending him the
+ * exit message. */
+ spin_unlock(&dlm->spinlock);
+
+ clear_node = 1;
+
+ status = dlm_send_one_domain_exit(dlm, node);
+ if (status < 0 &&
+ status != -ENOPROTOOPT &&
+ status != -ENOTCONN) {
+ mlog(ML_NOTICE, "Error %d sending domain exit message "
+ "to node %d\n", status, node);
+
+ /* Not sure what to do here but lets sleep for
+ * a bit in case this was a transient
+ * error... */
+ msleep(DLM_DOMAIN_BACKOFF_MS);
+ clear_node = 0;
+ }
+
+ spin_lock(&dlm->spinlock);
+ /* If we're not clearing the node bit then we intend
+ * to loop back around to try again. */
+ if (clear_node)
+ clear_bit(node, dlm->domain_map);
+ }
+ spin_unlock(&dlm->spinlock);
+}
+
+int dlm_joined(struct dlm_ctxt *dlm)
+{
+ int ret = 0;
+
+ spin_lock(&dlm_domain_lock);
+
+ if (dlm->dlm_state == DLM_CTXT_JOINED)
+ ret = 1;
+
+ spin_unlock(&dlm_domain_lock);
+
+ return ret;
+}
+
+int dlm_shutting_down(struct dlm_ctxt *dlm)
+{
+ int ret = 0;
+
+ spin_lock(&dlm_domain_lock);
+
+ if (dlm->dlm_state == DLM_CTXT_IN_SHUTDOWN)
+ ret = 1;
+
+ spin_unlock(&dlm_domain_lock);
+
+ return ret;
+}
+
+void dlm_unregister_domain(struct dlm_ctxt *dlm)
+{
+ int leave = 0;
+
+ spin_lock(&dlm_domain_lock);
+ BUG_ON(dlm->dlm_state != DLM_CTXT_JOINED);
+ BUG_ON(!dlm->num_joins);
+
+ dlm->num_joins--;
+ if (!dlm->num_joins) {
+ /* We mark it "in shutdown" now so new register
+ * requests wait until we've completely left the
+ * domain. Don't use DLM_CTXT_LEAVING yet as we still
+ * want new domain joins to communicate with us at
+ * least until we've completed migration of our
+ * resources. */
+ dlm->dlm_state = DLM_CTXT_IN_SHUTDOWN;
+ leave = 1;
+ }
+ spin_unlock(&dlm_domain_lock);
+
+ if (leave) {
+ mlog(0, "shutting down domain %s\n", dlm->name);
+
+ /* We changed dlm state, notify the thread */
+ dlm_kick_thread(dlm, NULL);
+
+ dlm_migrate_all_locks(dlm);
+ dlm_mark_domain_leaving(dlm);
+ dlm_leave_domain(dlm);
+ dlm_complete_dlm_shutdown(dlm);
+ }
+ dlm_put(dlm);
+}
+EXPORT_SYMBOL_GPL(dlm_unregister_domain);
+
+static int dlm_query_join_handler(struct o2net_msg *msg, u32 len, void *data)
+{
+ struct dlm_query_join_request *query;
+ enum dlm_query_join_response response;
+ struct dlm_ctxt *dlm = NULL;
+
+ query = (struct dlm_query_join_request *) msg->buf;
+
+ mlog(0, "node %u wants to join domain %s\n", query->node_idx,
+ query->domain);
+
+ /*
+ * If heartbeat doesn't consider the node live, tell it
+ * to back off and try again. This gives heartbeat a chance
+ * to catch up.
+ */
+ if (!o2hb_check_node_heartbeating(query->node_idx)) {
+ mlog(0, "node %u is not in our live map yet\n",
+ query->node_idx);
+
+ response = JOIN_DISALLOW;
+ goto respond;
+ }
+
+ response = JOIN_OK_NO_MAP;
+
+ spin_lock(&dlm_domain_lock);
+ dlm = __dlm_lookup_domain_full(query->domain, query->name_len);
+ /* Once the dlm ctxt is marked as leaving then we don't want
+ * to be put in someone's domain map. */
+ if (dlm && dlm->dlm_state != DLM_CTXT_LEAVING) {
+ spin_lock(&dlm->spinlock);
+
+ if (dlm->dlm_state == DLM_CTXT_NEW &&
+ dlm->joining_node == DLM_LOCK_RES_OWNER_UNKNOWN) {
+ /*If this is a brand new context and we
+ * haven't started our join process yet, then
+ * the other node won the race. */
+ response = JOIN_OK_NO_MAP;
+ } else if (dlm->joining_node != DLM_LOCK_RES_OWNER_UNKNOWN) {
+ /* Disallow parallel joins. */
+ response = JOIN_DISALLOW;
+ } else {
+ /* Alright we're fully a part of this domain
+ * so we keep some state as to who's joining
+ * and indicate to him that needs to be fixed
+ * up. */
+ response = JOIN_OK;
+ __dlm_set_joining_node(dlm, query->node_idx);
+ }
+
+ spin_unlock(&dlm->spinlock);
+ }
+ spin_unlock(&dlm_domain_lock);
+
+respond:
+ mlog(0, "We respond with %u\n", response);
+
+ return response;
+}
+
+static int dlm_assert_joined_handler(struct o2net_msg *msg, u32 len, void *data)
+{
+ struct dlm_assert_joined *assert;
+ struct dlm_ctxt *dlm = NULL;
+
+ assert = (struct dlm_assert_joined *) msg->buf;
+
+ mlog(0, "node %u asserts join on domain %s\n", assert->node_idx,
+ assert->domain);
+
+ spin_lock(&dlm_domain_lock);
+ dlm = __dlm_lookup_domain_full(assert->domain, assert->name_len);
+ /* XXX should we consider no dlm ctxt an error? */
+ if (dlm) {
+ spin_lock(&dlm->spinlock);
+
+ /* Alright, this node has officially joined our
+ * domain. Set him in the map and clean up our
+ * leftover join state. */
+ BUG_ON(dlm->joining_node != assert->node_idx);
+ set_bit(assert->node_idx, dlm->domain_map);
+ __dlm_set_joining_node(dlm, DLM_LOCK_RES_OWNER_UNKNOWN);
+
+ __dlm_print_nodes(dlm);
+
+ /* notify anything attached to the heartbeat events */
+ dlm_hb_event_notify_attached(dlm, assert->node_idx, 1);
+
+ spin_unlock(&dlm->spinlock);
+ }
+ spin_unlock(&dlm_domain_lock);
+
+ return 0;
+}
+
+static int dlm_cancel_join_handler(struct o2net_msg *msg, u32 len, void *data)
+{
+ struct dlm_cancel_join *cancel;
+ struct dlm_ctxt *dlm = NULL;
+
+ cancel = (struct dlm_cancel_join *) msg->buf;
+
+ mlog(0, "node %u cancels join on domain %s\n", cancel->node_idx,
+ cancel->domain);
+
+ spin_lock(&dlm_domain_lock);
+ dlm = __dlm_lookup_domain_full(cancel->domain, cancel->name_len);
+
+ if (dlm) {
+ spin_lock(&dlm->spinlock);
+
+ /* Yikes, this guy wants to cancel his join. No
+ * problem, we simply cleanup our join state. */
+ BUG_ON(dlm->joining_node != cancel->node_idx);
+ __dlm_set_joining_node(dlm, DLM_LOCK_RES_OWNER_UNKNOWN);
+
+ spin_unlock(&dlm->spinlock);
+ }
+ spin_unlock(&dlm_domain_lock);
+
+ return 0;
+}
+
+static int dlm_send_one_join_cancel(struct dlm_ctxt *dlm,
+ unsigned int node)
+{
+ int status;
+ struct dlm_cancel_join cancel_msg;
+
+ memset(&cancel_msg, 0, sizeof(cancel_msg));
+ cancel_msg.node_idx = dlm->node_num;
+ cancel_msg.name_len = strlen(dlm->name);
+ memcpy(cancel_msg.domain, dlm->name, cancel_msg.name_len);
+
+ status = o2net_send_message(DLM_CANCEL_JOIN_MSG, DLM_MOD_KEY,
+ &cancel_msg, sizeof(cancel_msg), node,
+ NULL);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+
+bail:
+ return status;
+}
+
+/* map_size should be in bytes. */
+static int dlm_send_join_cancels(struct dlm_ctxt *dlm,
+ unsigned long *node_map,
+ unsigned int map_size)
+{
+ int status, tmpstat;
+ unsigned int node;
+
+ if (map_size != (BITS_TO_LONGS(O2NM_MAX_NODES) *
+ sizeof(unsigned long))) {
+ mlog(ML_ERROR,
+ "map_size %u != BITS_TO_LONGS(O2NM_MAX_NODES) %u\n",
+ map_size, BITS_TO_LONGS(O2NM_MAX_NODES));
+ return -EINVAL;
+ }
+
+ status = 0;
+ node = -1;
+ while ((node = find_next_bit(node_map, O2NM_MAX_NODES,
+ node + 1)) < O2NM_MAX_NODES) {
+ if (node == dlm->node_num)
+ continue;
+
+ tmpstat = dlm_send_one_join_cancel(dlm, node);
+ if (tmpstat) {
+ mlog(ML_ERROR, "Error return %d cancelling join on "
+ "node %d\n", tmpstat, node);
+ if (!status)
+ status = tmpstat;
+ }
+ }
+
+ if (status)
+ mlog_errno(status);
+ return status;
+}
+
+static int dlm_request_join(struct dlm_ctxt *dlm,
+ int node,
+ enum dlm_query_join_response *response)
+{
+ int status, retval;
+ struct dlm_query_join_request join_msg;
+
+ mlog(0, "querying node %d\n", node);
+
+ memset(&join_msg, 0, sizeof(join_msg));
+ join_msg.node_idx = dlm->node_num;
+ join_msg.name_len = strlen(dlm->name);
+ memcpy(join_msg.domain, dlm->name, join_msg.name_len);
+
+ status = o2net_send_message(DLM_QUERY_JOIN_MSG, DLM_MOD_KEY, &join_msg,
+ sizeof(join_msg), node, &retval);
+ if (status < 0 && status != -ENOPROTOOPT) {
+ mlog_errno(status);
+ goto bail;
+ }
+
+ /* -ENOPROTOOPT from the net code means the other side isn't
+ listening for our message type -- that's fine, it means
+ his dlm isn't up, so we can consider him a 'yes' but not
+ joined into the domain. */
+ if (status == -ENOPROTOOPT) {
+ status = 0;
+ *response = JOIN_OK_NO_MAP;
+ } else if (retval == JOIN_DISALLOW ||
+ retval == JOIN_OK ||
+ retval == JOIN_OK_NO_MAP) {
+ *response = retval;
+ } else {
+ status = -EINVAL;
+ mlog(ML_ERROR, "invalid response %d from node %u\n", retval,
+ node);
+ }
+
+ mlog(0, "status %d, node %d response is %d\n", status, node,
+ *response);
+
+bail:
+ return status;
+}
+
+static int dlm_send_one_join_assert(struct dlm_ctxt *dlm,
+ unsigned int node)
+{
+ int status;
+ struct dlm_assert_joined assert_msg;
+
+ mlog(0, "Sending join assert to node %u\n", node);
+
+ memset(&assert_msg, 0, sizeof(assert_msg));
+ assert_msg.node_idx = dlm->node_num;
+ assert_msg.name_len = strlen(dlm->name);
+ memcpy(assert_msg.domain, dlm->name, assert_msg.name_len);
+
+ status = o2net_send_message(DLM_ASSERT_JOINED_MSG, DLM_MOD_KEY,
+ &assert_msg, sizeof(assert_msg), node,
+ NULL);
+ if (status < 0)
+ mlog_errno(status);
+
+ return status;
+}
+
+static void dlm_send_join_asserts(struct dlm_ctxt *dlm,
+ unsigned long *node_map)
+{
+ int status, node, live;
+
+ status = 0;
+ node = -1;
+ while ((node = find_next_bit(node_map, O2NM_MAX_NODES,
+ node + 1)) < O2NM_MAX_NODES) {
+ if (node == dlm->node_num)
+ continue;
+
+ do {
+ /* It is very important that this message be
+ * received so we spin until either the node
+ * has died or it gets the message. */
+ status = dlm_send_one_join_assert(dlm, node);
+
+ spin_lock(&dlm->spinlock);
+ live = test_bit(node, dlm->live_nodes_map);
+ spin_unlock(&dlm->spinlock);
+
+ if (status) {
+ mlog(ML_ERROR, "Error return %d asserting "
+ "join on node %d\n", status, node);
+
+ /* give us some time between errors... */
+ if (live)
+ msleep(DLM_DOMAIN_BACKOFF_MS);
+ }
+ } while (status && live);
+ }
+}
+
+struct domain_join_ctxt {
+ unsigned long live_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
+ unsigned long yes_resp_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
+};
+
+static int dlm_should_restart_join(struct dlm_ctxt *dlm,
+ struct domain_join_ctxt *ctxt,
+ enum dlm_query_join_response response)
+{
+ int ret;
+
+ if (response == JOIN_DISALLOW) {
+ mlog(0, "Latest response of disallow -- should restart\n");
+ return 1;
+ }
+
+ spin_lock(&dlm->spinlock);
+ /* For now, we restart the process if the node maps have
+ * changed at all */
+ ret = memcmp(ctxt->live_map, dlm->live_nodes_map,
+ sizeof(dlm->live_nodes_map));
+ spin_unlock(&dlm->spinlock);
+
+ if (ret)
+ mlog(0, "Node maps changed -- should restart\n");
+
+ return ret;
+}
+
+static int dlm_try_to_join_domain(struct dlm_ctxt *dlm)
+{
+ int status = 0, tmpstat, node;
+ struct domain_join_ctxt *ctxt;
+ enum dlm_query_join_response response;
+
+ mlog_entry("%p", dlm);
+
+ ctxt = kcalloc(1, sizeof(*ctxt), GFP_KERNEL);
+ if (!ctxt) {
+ status = -ENOMEM;
+ mlog_errno(status);
+ goto bail;
+ }
+
+ /* group sem locking should work for us here -- we're already
+ * registered for heartbeat events so filling this should be
+ * atomic wrt getting those handlers called. */
+ o2hb_fill_node_map(dlm->live_nodes_map, sizeof(dlm->live_nodes_map));
+
+ spin_lock(&dlm->spinlock);
+ memcpy(ctxt->live_map, dlm->live_nodes_map, sizeof(ctxt->live_map));
+
+ __dlm_set_joining_node(dlm, dlm->node_num);
+
+ spin_unlock(&dlm->spinlock);
+
+ node = -1;
+ while ((node = find_next_bit(ctxt->live_map, O2NM_MAX_NODES,
+ node + 1)) < O2NM_MAX_NODES) {
+ if (node == dlm->node_num)
+ continue;
+
+ status = dlm_request_join(dlm, node, &response);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+
+ /* Ok, either we got a response or the node doesn't have a
+ * dlm up. */
+ if (response == JOIN_OK)
+ set_bit(node, ctxt->yes_resp_map);
+
+ if (dlm_should_restart_join(dlm, ctxt, response)) {
+ status = -EAGAIN;
+ goto bail;
+ }
+ }
+
+ mlog(0, "Yay, done querying nodes!\n");
+
+ /* Yay, everyone agree's we can join the domain. My domain is
+ * comprised of all nodes who were put in the
+ * yes_resp_map. Copy that into our domain map and send a join
+ * assert message to clean up everyone elses state. */
+ spin_lock(&dlm->spinlock);
+ memcpy(dlm->domain_map, ctxt->yes_resp_map,
+ sizeof(ctxt->yes_resp_map));
+ set_bit(dlm->node_num, dlm->domain_map);
+ spin_unlock(&dlm->spinlock);
+
+ dlm_send_join_asserts(dlm, ctxt->yes_resp_map);
+
+ /* Joined state *must* be set before the joining node
+ * information, otherwise the query_join handler may read no
+ * current joiner but a state of NEW and tell joining nodes
+ * we're not in the domain. */
+ spin_lock(&dlm_domain_lock);
+ dlm->dlm_state = DLM_CTXT_JOINED;
+ dlm->num_joins++;
+ spin_unlock(&dlm_domain_lock);
+
+bail:
+ spin_lock(&dlm->spinlock);
+ __dlm_set_joining_node(dlm, DLM_LOCK_RES_OWNER_UNKNOWN);
+ if (!status)
+ __dlm_print_nodes(dlm);
+ spin_unlock(&dlm->spinlock);
+
+ if (ctxt) {
+ /* Do we need to send a cancel message to any nodes? */
+ if (status < 0) {
+ tmpstat = dlm_send_join_cancels(dlm,
+ ctxt->yes_resp_map,
+ sizeof(ctxt->yes_resp_map));
+ if (tmpstat < 0)
+ mlog_errno(tmpstat);
+ }
+ kfree(ctxt);
+ }
+
+ mlog(0, "returning %d\n", status);
+ return status;
+}
+
+static void dlm_unregister_domain_handlers(struct dlm_ctxt *dlm)
+{
+ o2hb_unregister_callback(&dlm->dlm_hb_up);
+ o2hb_unregister_callback(&dlm->dlm_hb_down);
+ o2net_unregister_handler_list(&dlm->dlm_domain_handlers);
+}
+
+static int dlm_register_domain_handlers(struct dlm_ctxt *dlm)
+{
+ int status;
+
+ mlog(0, "registering handlers.\n");
+
+ o2hb_setup_callback(&dlm->dlm_hb_down, O2HB_NODE_DOWN_CB,
+ dlm_hb_node_down_cb, dlm, DLM_HB_NODE_DOWN_PRI);
+ status = o2hb_register_callback(&dlm->dlm_hb_down);
+ if (status)
+ goto bail;
+
+ o2hb_setup_callback(&dlm->dlm_hb_up, O2HB_NODE_UP_CB,
+ dlm_hb_node_up_cb, dlm, DLM_HB_NODE_UP_PRI);
+ status = o2hb_register_callback(&dlm->dlm_hb_up);
+ if (status)
+ goto bail;
+
+ status = o2net_register_handler(DLM_MASTER_REQUEST_MSG, dlm->key,
+ sizeof(struct dlm_master_request),
+ dlm_master_request_handler,
+ dlm, &dlm->dlm_domain_handlers);
+ if (status)
+ goto bail;
+
+ status = o2net_register_handler(DLM_ASSERT_MASTER_MSG, dlm->key,
+ sizeof(struct dlm_assert_master),
+ dlm_assert_master_handler,
+ dlm, &dlm->dlm_domain_handlers);
+ if (status)
+ goto bail;
+
+ status = o2net_register_handler(DLM_CREATE_LOCK_MSG, dlm->key,
+ sizeof(struct dlm_create_lock),
+ dlm_create_lock_handler,
+ dlm, &dlm->dlm_domain_handlers);
+ if (status)
+ goto bail;
+
+ status = o2net_register_handler(DLM_CONVERT_LOCK_MSG, dlm->key,
+ DLM_CONVERT_LOCK_MAX_LEN,
+ dlm_convert_lock_handler,
+ dlm, &dlm->dlm_domain_handlers);
+ if (status)
+ goto bail;
+
+ status = o2net_register_handler(DLM_UNLOCK_LOCK_MSG, dlm->key,
+ DLM_UNLOCK_LOCK_MAX_LEN,
+ dlm_unlock_lock_handler,
+ dlm, &dlm->dlm_domain_handlers);
+ if (status)
+ goto bail;
+
+ status = o2net_register_handler(DLM_PROXY_AST_MSG, dlm->key,
+ DLM_PROXY_AST_MAX_LEN,
+ dlm_proxy_ast_handler,
+ dlm, &dlm->dlm_domain_handlers);
+ if (status)
+ goto bail;
+
+ status = o2net_register_handler(DLM_EXIT_DOMAIN_MSG, dlm->key,
+ sizeof(struct dlm_exit_domain),
+ dlm_exit_domain_handler,
+ dlm, &dlm->dlm_domain_handlers);
+ if (status)
+ goto bail;
+
+ status = o2net_register_handler(DLM_MIGRATE_REQUEST_MSG, dlm->key,
+ sizeof(struct dlm_migrate_request),
+ dlm_migrate_request_handler,
+ dlm, &dlm->dlm_domain_handlers);
+ if (status)
+ goto bail;
+
+ status = o2net_register_handler(DLM_MIG_LOCKRES_MSG, dlm->key,
+ DLM_MIG_LOCKRES_MAX_LEN,
+ dlm_mig_lockres_handler,
+ dlm, &dlm->dlm_domain_handlers);
+ if (status)
+ goto bail;
+
+ status = o2net_register_handler(DLM_MASTER_REQUERY_MSG, dlm->key,
+ sizeof(struct dlm_master_requery),
+ dlm_master_requery_handler,
+ dlm, &dlm->dlm_domain_handlers);
+ if (status)
+ goto bail;
+
+ status = o2net_register_handler(DLM_LOCK_REQUEST_MSG, dlm->key,
+ sizeof(struct dlm_lock_request),
+ dlm_request_all_locks_handler,
+ dlm, &dlm->dlm_domain_handlers);
+ if (status)
+ goto bail;
+
+ status = o2net_register_handler(DLM_RECO_DATA_DONE_MSG, dlm->key,
+ sizeof(struct dlm_reco_data_done),
+ dlm_reco_data_done_handler,
+ dlm, &dlm->dlm_domain_handlers);
+ if (status)
+ goto bail;
+
+ status = o2net_register_handler(DLM_BEGIN_RECO_MSG, dlm->key,
+ sizeof(struct dlm_begin_reco),
+ dlm_begin_reco_handler,
+ dlm, &dlm->dlm_domain_handlers);
+ if (status)
+ goto bail;
+
+ status = o2net_register_handler(DLM_FINALIZE_RECO_MSG, dlm->key,
+ sizeof(struct dlm_finalize_reco),
+ dlm_finalize_reco_handler,
+ dlm, &dlm->dlm_domain_handlers);
+ if (status)
+ goto bail;
+
+bail:
+ if (status)
+ dlm_unregister_domain_handlers(dlm);
+
+ return status;
+}
+
+static int dlm_join_domain(struct dlm_ctxt *dlm)
+{
+ int status;
+
+ BUG_ON(!dlm);
+
+ mlog(0, "Join domain %s\n", dlm->name);
+
+ status = dlm_register_domain_handlers(dlm);
+ if (status) {
+ mlog_errno(status);
+ goto bail;
+ }
+
+ status = dlm_launch_thread(dlm);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+
+ status = dlm_launch_recovery_thread(dlm);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+
+ do {
+ unsigned int backoff;
+ status = dlm_try_to_join_domain(dlm);
+
+ /* If we're racing another node to the join, then we
+ * need to back off temporarily and let them
+ * complete. */
+ if (status == -EAGAIN) {
+ if (signal_pending(current)) {
+ status = -ERESTARTSYS;
+ goto bail;
+ }
+
+ /*
+ * <chip> After you!
+ * <dale> No, after you!
+ * <chip> I insist!
+ * <dale> But you first!
+ * ...
+ */
+ backoff = (unsigned int)(jiffies & 0x3);
+ backoff *= DLM_DOMAIN_BACKOFF_MS;
+ mlog(0, "backoff %d\n", backoff);
+ msleep(backoff);
+ }
+ } while (status == -EAGAIN);
+
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+
+ status = 0;
+bail:
+ wake_up(&dlm_domain_events);
+
+ if (status) {
+ dlm_unregister_domain_handlers(dlm);
+ dlm_complete_thread(dlm);
+ dlm_complete_recovery_thread(dlm);
+ }
+
+ return status;
+}
+
+static struct dlm_ctxt *dlm_alloc_ctxt(const char *domain,
+ u32 key)
+{
+ int i;
+ struct dlm_ctxt *dlm = NULL;
+
+ dlm = kcalloc(1, sizeof(*dlm), GFP_KERNEL);
+ if (!dlm) {
+ mlog_errno(-ENOMEM);
+ goto leave;
+ }
+
+ dlm->name = kmalloc(strlen(domain) + 1, GFP_KERNEL);
+ if (dlm->name == NULL) {
+ mlog_errno(-ENOMEM);
+ kfree(dlm);
+ dlm = NULL;
+ goto leave;
+ }
+
+ dlm->resources = (struct list_head *) __get_free_page(GFP_KERNEL);
+ if (!dlm->resources) {
+ mlog_errno(-ENOMEM);
+ kfree(dlm->name);
+ kfree(dlm);
+ dlm = NULL;
+ goto leave;
+ }
+ memset(dlm->resources, 0, PAGE_SIZE);
+
+ for (i=0; i<DLM_HASH_SIZE; i++)
+ INIT_LIST_HEAD(&dlm->resources[i]);
+
+ strcpy(dlm->name, domain);
+ dlm->key = key;
+ dlm->node_num = o2nm_this_node();
+
+ spin_lock_init(&dlm->spinlock);
+ spin_lock_init(&dlm->master_lock);
+ spin_lock_init(&dlm->ast_lock);
+ INIT_LIST_HEAD(&dlm->list);
+ INIT_LIST_HEAD(&dlm->dirty_list);
+ INIT_LIST_HEAD(&dlm->reco.resources);
+ INIT_LIST_HEAD(&dlm->reco.received);
+ INIT_LIST_HEAD(&dlm->reco.node_data);
+ INIT_LIST_HEAD(&dlm->purge_list);
+ INIT_LIST_HEAD(&dlm->dlm_domain_handlers);
+ dlm->reco.state = 0;
+
+ INIT_LIST_HEAD(&dlm->pending_asts);
+ INIT_LIST_HEAD(&dlm->pending_basts);
+
+ mlog(0, "dlm->recovery_map=%p, &(dlm->recovery_map[0])=%p\n",
+ dlm->recovery_map, &(dlm->recovery_map[0]));
+
+ memset(dlm->recovery_map, 0, sizeof(dlm->recovery_map));
+ memset(dlm->live_nodes_map, 0, sizeof(dlm->live_nodes_map));
+ memset(dlm->domain_map, 0, sizeof(dlm->domain_map));
+
+ dlm->dlm_thread_task = NULL;
+ dlm->dlm_reco_thread_task = NULL;
+ init_waitqueue_head(&dlm->dlm_thread_wq);
+ init_waitqueue_head(&dlm->dlm_reco_thread_wq);
+ init_waitqueue_head(&dlm->reco.event);
+ init_waitqueue_head(&dlm->ast_wq);
+ init_waitqueue_head(&dlm->migration_wq);
+ INIT_LIST_HEAD(&dlm->master_list);
+ INIT_LIST_HEAD(&dlm->mle_hb_events);
+
+ dlm->joining_node = DLM_LOCK_RES_OWNER_UNKNOWN;
+ init_waitqueue_head(&dlm->dlm_join_events);
+
+ dlm->reco.new_master = O2NM_INVALID_NODE_NUM;
+ dlm->reco.dead_node = O2NM_INVALID_NODE_NUM;
+ atomic_set(&dlm->local_resources, 0);
+ atomic_set(&dlm->remote_resources, 0);
+ atomic_set(&dlm->unknown_resources, 0);
+
+ spin_lock_init(&dlm->work_lock);
+ INIT_LIST_HEAD(&dlm->work_list);
+ INIT_WORK(&dlm->dispatched_work, dlm_dispatch_work, dlm);
+
+ kref_init(&dlm->dlm_refs);
+ dlm->dlm_state = DLM_CTXT_NEW;
+
+ INIT_LIST_HEAD(&dlm->dlm_eviction_callbacks);
+
+ mlog(0, "context init: refcount %u\n",
+ atomic_read(&dlm->dlm_refs.refcount));
+
+leave:
+ return dlm;
+}
+
+/*
+ * dlm_register_domain: one-time setup per "domain"
+ */
+struct dlm_ctxt * dlm_register_domain(const char *domain,
+ u32 key)
+{
+ int ret;
+ struct dlm_ctxt *dlm = NULL;
+ struct dlm_ctxt *new_ctxt = NULL;
+
+ if (strlen(domain) > O2NM_MAX_NAME_LEN) {
+ ret = -ENAMETOOLONG;
+ mlog(ML_ERROR, "domain name length too long\n");
+ goto leave;
+ }
+
+ if (!o2hb_check_local_node_heartbeating()) {
+ mlog(ML_ERROR, "the local node has not been configured, or is "
+ "not heartbeating\n");
+ ret = -EPROTO;
+ goto leave;
+ }
+
+ mlog(0, "register called for domain \"%s\"\n", domain);
+
+retry:
+ dlm = NULL;
+ if (signal_pending(current)) {
+ ret = -ERESTARTSYS;
+ mlog_errno(ret);
+ goto leave;
+ }
+
+ spin_lock(&dlm_domain_lock);
+
+ dlm = __dlm_lookup_domain(domain);
+ if (dlm) {
+ if (dlm->dlm_state != DLM_CTXT_JOINED) {
+ spin_unlock(&dlm_domain_lock);
+
+ mlog(0, "This ctxt is not joined yet!\n");
+ wait_event_interruptible(dlm_domain_events,
+ dlm_wait_on_domain_helper(
+ domain));
+ goto retry;
+ }
+
+ __dlm_get(dlm);
+ dlm->num_joins++;
+
+ spin_unlock(&dlm_domain_lock);
+
+ ret = 0;
+ goto leave;
+ }
+
+ /* doesn't exist */
+ if (!new_ctxt) {
+ spin_unlock(&dlm_domain_lock);
+
+ new_ctxt = dlm_alloc_ctxt(domain, key);
+ if (new_ctxt)
+ goto retry;
+
+ ret = -ENOMEM;
+ mlog_errno(ret);
+ goto leave;
+ }
+
+ /* a little variable switch-a-roo here... */
+ dlm = new_ctxt;
+ new_ctxt = NULL;
+
+ /* add the new domain */
+ list_add_tail(&dlm->list, &dlm_domains);
+ spin_unlock(&dlm_domain_lock);
+
+ ret = dlm_join_domain(dlm);
+ if (ret) {
+ mlog_errno(ret);
+ dlm_put(dlm);
+ goto leave;
+ }
+
+ ret = 0;
+leave:
+ if (new_ctxt)
+ dlm_free_ctxt_mem(new_ctxt);
+
+ if (ret < 0)
+ dlm = ERR_PTR(ret);
+
+ return dlm;
+}
+EXPORT_SYMBOL_GPL(dlm_register_domain);
+
+static LIST_HEAD(dlm_join_handlers);
+
+static void dlm_unregister_net_handlers(void)
+{
+ o2net_unregister_handler_list(&dlm_join_handlers);
+}
+
+static int dlm_register_net_handlers(void)
+{
+ int status = 0;
+
+ status = o2net_register_handler(DLM_QUERY_JOIN_MSG, DLM_MOD_KEY,
+ sizeof(struct dlm_query_join_request),
+ dlm_query_join_handler,
+ NULL, &dlm_join_handlers);
+ if (status)
+ goto bail;
+
+ status = o2net_register_handler(DLM_ASSERT_JOINED_MSG, DLM_MOD_KEY,
+ sizeof(struct dlm_assert_joined),
+ dlm_assert_joined_handler,
+ NULL, &dlm_join_handlers);
+ if (status)
+ goto bail;
+
+ status = o2net_register_handler(DLM_CANCEL_JOIN_MSG, DLM_MOD_KEY,
+ sizeof(struct dlm_cancel_join),
+ dlm_cancel_join_handler,
+ NULL, &dlm_join_handlers);
+
+bail:
+ if (status < 0)
+ dlm_unregister_net_handlers();
+
+ return status;
+}
+
+/* Domain eviction callback handling.
+ *
+ * The file system requires notification of node death *before* the
+ * dlm completes it's recovery work, otherwise it may be able to
+ * acquire locks on resources requiring recovery. Since the dlm can
+ * evict a node from it's domain *before* heartbeat fires, a similar
+ * mechanism is required. */
+
+/* Eviction is not expected to happen often, so a per-domain lock is
+ * not necessary. Eviction callbacks are allowed to sleep for short
+ * periods of time. */
+static DECLARE_RWSEM(dlm_callback_sem);
+
+void dlm_fire_domain_eviction_callbacks(struct dlm_ctxt *dlm,
+ int node_num)
+{
+ struct list_head *iter;
+ struct dlm_eviction_cb *cb;
+
+ down_read(&dlm_callback_sem);
+ list_for_each(iter, &dlm->dlm_eviction_callbacks) {
+ cb = list_entry(iter, struct dlm_eviction_cb, ec_item);
+
+ cb->ec_func(node_num, cb->ec_data);
+ }
+ up_read(&dlm_callback_sem);
+}
+
+void dlm_setup_eviction_cb(struct dlm_eviction_cb *cb,
+ dlm_eviction_func *f,
+ void *data)
+{
+ INIT_LIST_HEAD(&cb->ec_item);
+ cb->ec_func = f;
+ cb->ec_data = data;
+}
+EXPORT_SYMBOL_GPL(dlm_setup_eviction_cb);
+
+void dlm_register_eviction_cb(struct dlm_ctxt *dlm,
+ struct dlm_eviction_cb *cb)
+{
+ down_write(&dlm_callback_sem);
+ list_add_tail(&cb->ec_item, &dlm->dlm_eviction_callbacks);
+ up_write(&dlm_callback_sem);
+}
+EXPORT_SYMBOL_GPL(dlm_register_eviction_cb);
+
+void dlm_unregister_eviction_cb(struct dlm_eviction_cb *cb)
+{
+ down_write(&dlm_callback_sem);
+ list_del_init(&cb->ec_item);
+ up_write(&dlm_callback_sem);
+}
+EXPORT_SYMBOL_GPL(dlm_unregister_eviction_cb);
+
+static int __init dlm_init(void)
+{
+ int status;
+
+ dlm_print_version();
+
+ status = dlm_init_mle_cache();
+ if (status)
+ return -1;
+
+ status = dlm_register_net_handlers();
+ if (status) {
+ dlm_destroy_mle_cache();
+ return -1;
+ }
+
+ return 0;
+}
+
+static void __exit dlm_exit (void)
+{
+ dlm_unregister_net_handlers();
+ dlm_destroy_mle_cache();
+}
+
+MODULE_AUTHOR("Oracle");
+MODULE_LICENSE("GPL");
+
+module_init(dlm_init);
+module_exit(dlm_exit);
--- /dev/null
+/* -*- mode: c; c-basic-offset: 8; -*-
+ * vim: noexpandtab sw=8 ts=8 sts=0:
+ *
+ * dlmdomain.h
+ *
+ * Copyright (C) 2004 Oracle. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ *
+ */
+
+#ifndef DLMDOMAIN_H
+#define DLMDOMAIN_H
+
+extern spinlock_t dlm_domain_lock;
+extern struct list_head dlm_domains;
+
+int dlm_joined(struct dlm_ctxt *dlm);
+int dlm_shutting_down(struct dlm_ctxt *dlm);
+void dlm_fire_domain_eviction_callbacks(struct dlm_ctxt *dlm,
+ int node_num);
+
+#endif
--- /dev/null
+/* -*- mode: c; c-basic-offset: 8; -*-
+ * vim: noexpandtab sw=8 ts=8 sts=0:
+ *
+ * dlmlock.c
+ *
+ * underlying calls for lock creation
+ *
+ * Copyright (C) 2004 Oracle. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ *
+ */
+
+
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/highmem.h>
+#include <linux/utsname.h>
+#include <linux/init.h>
+#include <linux/sysctl.h>
+#include <linux/random.h>
+#include <linux/blkdev.h>
+#include <linux/socket.h>
+#include <linux/inet.h>
+#include <linux/spinlock.h>
+#include <linux/delay.h>
+
+
+#include "cluster/heartbeat.h"
+#include "cluster/nodemanager.h"
+#include "cluster/tcp.h"
+
+#include "dlmapi.h"
+#include "dlmcommon.h"
+
+#include "dlmconvert.h"
+
+#define MLOG_MASK_PREFIX ML_DLM
+#include "cluster/masklog.h"
+
+static spinlock_t dlm_cookie_lock = SPIN_LOCK_UNLOCKED;
+static u64 dlm_next_cookie = 1;
+
+static enum dlm_status dlm_send_remote_lock_request(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res,
+ struct dlm_lock *lock, int flags);
+static void dlm_init_lock(struct dlm_lock *newlock, int type,
+ u8 node, u64 cookie);
+static void dlm_lock_release(struct kref *kref);
+static void dlm_lock_detach_lockres(struct dlm_lock *lock);
+
+/* Tell us whether we can grant a new lock request.
+ * locking:
+ * caller needs: res->spinlock
+ * taken: none
+ * held on exit: none
+ * returns: 1 if the lock can be granted, 0 otherwise.
+ */
+static int dlm_can_grant_new_lock(struct dlm_lock_resource *res,
+ struct dlm_lock *lock)
+{
+ struct list_head *iter;
+ struct dlm_lock *tmplock;
+
+ list_for_each(iter, &res->granted) {
+ tmplock = list_entry(iter, struct dlm_lock, list);
+
+ if (!dlm_lock_compatible(tmplock->ml.type, lock->ml.type))
+ return 0;
+ }
+
+ list_for_each(iter, &res->converting) {
+ tmplock = list_entry(iter, struct dlm_lock, list);
+
+ if (!dlm_lock_compatible(tmplock->ml.type, lock->ml.type))
+ return 0;
+ }
+
+ return 1;
+}
+
+/* performs lock creation at the lockres master site
+ * locking:
+ * caller needs: none
+ * taken: takes and drops res->spinlock
+ * held on exit: none
+ * returns: DLM_NORMAL, DLM_NOTQUEUED
+ */
+static enum dlm_status dlmlock_master(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res,
+ struct dlm_lock *lock, int flags)
+{
+ int call_ast = 0, kick_thread = 0;
+ enum dlm_status status = DLM_NORMAL;
+
+ mlog_entry("type=%d\n", lock->ml.type);
+
+ spin_lock(&res->spinlock);
+ /* if called from dlm_create_lock_handler, need to
+ * ensure it will not sleep in dlm_wait_on_lockres */
+ status = __dlm_lockres_state_to_status(res);
+ if (status != DLM_NORMAL &&
+ lock->ml.node != dlm->node_num) {
+ /* erf. state changed after lock was dropped. */
+ spin_unlock(&res->spinlock);
+ dlm_error(status);
+ return status;
+ }
+ __dlm_wait_on_lockres(res);
+ __dlm_lockres_reserve_ast(res);
+
+ if (dlm_can_grant_new_lock(res, lock)) {
+ mlog(0, "I can grant this lock right away\n");
+ /* got it right away */
+ lock->lksb->status = DLM_NORMAL;
+ status = DLM_NORMAL;
+ dlm_lock_get(lock);
+ list_add_tail(&lock->list, &res->granted);
+
+ /* for the recovery lock, we can't allow the ast
+ * to be queued since the dlmthread is already
+ * frozen. but the recovery lock is always locked
+ * with LKM_NOQUEUE so we do not need the ast in
+ * this special case */
+ if (!dlm_is_recovery_lock(res->lockname.name,
+ res->lockname.len)) {
+ kick_thread = 1;
+ call_ast = 1;
+ }
+ } else {
+ /* for NOQUEUE request, unless we get the
+ * lock right away, return DLM_NOTQUEUED */
+ if (flags & LKM_NOQUEUE)
+ status = DLM_NOTQUEUED;
+ else {
+ dlm_lock_get(lock);
+ list_add_tail(&lock->list, &res->blocked);
+ kick_thread = 1;
+ }
+ }
+
+ spin_unlock(&res->spinlock);
+ wake_up(&res->wq);
+
+ /* either queue the ast or release it */
+ if (call_ast)
+ dlm_queue_ast(dlm, lock);
+ else
+ dlm_lockres_release_ast(dlm, res);
+
+ dlm_lockres_calc_usage(dlm, res);
+ if (kick_thread)
+ dlm_kick_thread(dlm, res);
+
+ return status;
+}
+
+void dlm_revert_pending_lock(struct dlm_lock_resource *res,
+ struct dlm_lock *lock)
+{
+ /* remove from local queue if it failed */
+ list_del_init(&lock->list);
+ lock->lksb->flags &= ~DLM_LKSB_GET_LVB;
+}
+
+
+/*
+ * locking:
+ * caller needs: none
+ * taken: takes and drops res->spinlock
+ * held on exit: none
+ * returns: DLM_DENIED, DLM_RECOVERING, or net status
+ */
+static enum dlm_status dlmlock_remote(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res,
+ struct dlm_lock *lock, int flags)
+{
+ enum dlm_status status = DLM_DENIED;
+
+ mlog_entry("type=%d\n", lock->ml.type);
+ mlog(0, "lockres %.*s, flags = 0x%x\n", res->lockname.len,
+ res->lockname.name, flags);
+
+ spin_lock(&res->spinlock);
+
+ /* will exit this call with spinlock held */
+ __dlm_wait_on_lockres(res);
+ res->state |= DLM_LOCK_RES_IN_PROGRESS;
+
+ /* add lock to local (secondary) queue */
+ dlm_lock_get(lock);
+ list_add_tail(&lock->list, &res->blocked);
+ lock->lock_pending = 1;
+ spin_unlock(&res->spinlock);
+
+ /* spec seems to say that you will get DLM_NORMAL when the lock
+ * has been queued, meaning we need to wait for a reply here. */
+ status = dlm_send_remote_lock_request(dlm, res, lock, flags);
+
+ spin_lock(&res->spinlock);
+ res->state &= ~DLM_LOCK_RES_IN_PROGRESS;
+ lock->lock_pending = 0;
+ if (status != DLM_NORMAL) {
+ if (status != DLM_NOTQUEUED)
+ dlm_error(status);
+ dlm_revert_pending_lock(res, lock);
+ dlm_lock_put(lock);
+ }
+ spin_unlock(&res->spinlock);
+
+ dlm_lockres_calc_usage(dlm, res);
+
+ wake_up(&res->wq);
+ return status;
+}
+
+
+/* for remote lock creation.
+ * locking:
+ * caller needs: none, but need res->state & DLM_LOCK_RES_IN_PROGRESS
+ * taken: none
+ * held on exit: none
+ * returns: DLM_NOLOCKMGR, or net status
+ */
+static enum dlm_status dlm_send_remote_lock_request(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res,
+ struct dlm_lock *lock, int flags)
+{
+ struct dlm_create_lock create;
+ int tmpret, status = 0;
+ enum dlm_status ret;
+
+ mlog_entry_void();
+
+ memset(&create, 0, sizeof(create));
+ create.node_idx = dlm->node_num;
+ create.requested_type = lock->ml.type;
+ create.cookie = lock->ml.cookie;
+ create.namelen = res->lockname.len;
+ create.flags = cpu_to_be32(flags);
+ memcpy(create.name, res->lockname.name, create.namelen);
+
+ tmpret = o2net_send_message(DLM_CREATE_LOCK_MSG, dlm->key, &create,
+ sizeof(create), res->owner, &status);
+ if (tmpret >= 0) {
+ // successfully sent and received
+ ret = status; // this is already a dlm_status
+ } else {
+ mlog_errno(tmpret);
+ if (dlm_is_host_down(tmpret)) {
+ ret = DLM_RECOVERING;
+ mlog(0, "node %u died so returning DLM_RECOVERING "
+ "from lock message!\n", res->owner);
+ } else {
+ ret = dlm_err_to_dlm_status(tmpret);
+ }
+ }
+
+ return ret;
+}
+
+void dlm_lock_get(struct dlm_lock *lock)
+{
+ kref_get(&lock->lock_refs);
+}
+
+void dlm_lock_put(struct dlm_lock *lock)
+{
+ kref_put(&lock->lock_refs, dlm_lock_release);
+}
+
+static void dlm_lock_release(struct kref *kref)
+{
+ struct dlm_lock *lock;
+
+ lock = container_of(kref, struct dlm_lock, lock_refs);
+
+ BUG_ON(!list_empty(&lock->list));
+ BUG_ON(!list_empty(&lock->ast_list));
+ BUG_ON(!list_empty(&lock->bast_list));
+ BUG_ON(lock->ast_pending);
+ BUG_ON(lock->bast_pending);
+
+ dlm_lock_detach_lockres(lock);
+
+ if (lock->lksb_kernel_allocated) {
+ mlog(0, "freeing kernel-allocated lksb\n");
+ kfree(lock->lksb);
+ }
+ kfree(lock);
+}
+
+/* associate a lock with it's lockres, getting a ref on the lockres */
+void dlm_lock_attach_lockres(struct dlm_lock *lock,
+ struct dlm_lock_resource *res)
+{
+ dlm_lockres_get(res);
+ lock->lockres = res;
+}
+
+/* drop ref on lockres, if there is still one associated with lock */
+static void dlm_lock_detach_lockres(struct dlm_lock *lock)
+{
+ struct dlm_lock_resource *res;
+
+ res = lock->lockres;
+ if (res) {
+ lock->lockres = NULL;
+ mlog(0, "removing lock's lockres reference\n");
+ dlm_lockres_put(res);
+ }
+}
+
+static void dlm_init_lock(struct dlm_lock *newlock, int type,
+ u8 node, u64 cookie)
+{
+ INIT_LIST_HEAD(&newlock->list);
+ INIT_LIST_HEAD(&newlock->ast_list);
+ INIT_LIST_HEAD(&newlock->bast_list);
+ spin_lock_init(&newlock->spinlock);
+ newlock->ml.type = type;
+ newlock->ml.convert_type = LKM_IVMODE;
+ newlock->ml.highest_blocked = LKM_IVMODE;
+ newlock->ml.node = node;
+ newlock->ml.pad1 = 0;
+ newlock->ml.list = 0;
+ newlock->ml.flags = 0;
+ newlock->ast = NULL;
+ newlock->bast = NULL;
+ newlock->astdata = NULL;
+ newlock->ml.cookie = cpu_to_be64(cookie);
+ newlock->ast_pending = 0;
+ newlock->bast_pending = 0;
+ newlock->convert_pending = 0;
+ newlock->lock_pending = 0;
+ newlock->unlock_pending = 0;
+ newlock->cancel_pending = 0;
+ newlock->lksb_kernel_allocated = 0;
+
+ kref_init(&newlock->lock_refs);
+}
+
+struct dlm_lock * dlm_new_lock(int type, u8 node, u64 cookie,
+ struct dlm_lockstatus *lksb)
+{
+ struct dlm_lock *lock;
+ int kernel_allocated = 0;
+
+ lock = kcalloc(1, sizeof(*lock), GFP_KERNEL);
+ if (!lock)
+ return NULL;
+
+ if (!lksb) {
+ /* zero memory only if kernel-allocated */
+ lksb = kcalloc(1, sizeof(*lksb), GFP_KERNEL);
+ if (!lksb) {
+ kfree(lock);
+ return NULL;
+ }
+ kernel_allocated = 1;
+ }
+
+ dlm_init_lock(lock, type, node, cookie);
+ if (kernel_allocated)
+ lock->lksb_kernel_allocated = 1;
+ lock->lksb = lksb;
+ lksb->lockid = lock;
+ return lock;
+}
+
+/* handler for lock creation net message
+ * locking:
+ * caller needs: none
+ * taken: takes and drops res->spinlock
+ * held on exit: none
+ * returns: DLM_NORMAL, DLM_SYSERR, DLM_IVLOCKID, DLM_NOTQUEUED
+ */
+int dlm_create_lock_handler(struct o2net_msg *msg, u32 len, void *data)
+{
+ struct dlm_ctxt *dlm = data;
+ struct dlm_create_lock *create = (struct dlm_create_lock *)msg->buf;
+ struct dlm_lock_resource *res = NULL;
+ struct dlm_lock *newlock = NULL;
+ struct dlm_lockstatus *lksb = NULL;
+ enum dlm_status status = DLM_NORMAL;
+ char *name;
+ unsigned int namelen;
+
+ BUG_ON(!dlm);
+
+ mlog_entry_void();
+
+ if (!dlm_grab(dlm))
+ return DLM_REJECTED;
+
+ mlog_bug_on_msg(!dlm_domain_fully_joined(dlm),
+ "Domain %s not fully joined!\n", dlm->name);
+
+ name = create->name;
+ namelen = create->namelen;
+
+ status = DLM_IVBUFLEN;
+ if (namelen > DLM_LOCKID_NAME_MAX) {
+ dlm_error(status);
+ goto leave;
+ }
+
+ status = DLM_SYSERR;
+ newlock = dlm_new_lock(create->requested_type,
+ create->node_idx,
+ be64_to_cpu(create->cookie), NULL);
+ if (!newlock) {
+ dlm_error(status);
+ goto leave;
+ }
+
+ lksb = newlock->lksb;
+
+ if (be32_to_cpu(create->flags) & LKM_GET_LVB) {
+ lksb->flags |= DLM_LKSB_GET_LVB;
+ mlog(0, "set DLM_LKSB_GET_LVB flag\n");
+ }
+
+ status = DLM_IVLOCKID;
+ res = dlm_lookup_lockres(dlm, name, namelen);
+ if (!res) {
+ dlm_error(status);
+ goto leave;
+ }
+
+ spin_lock(&res->spinlock);
+ status = __dlm_lockres_state_to_status(res);
+ spin_unlock(&res->spinlock);
+
+ if (status != DLM_NORMAL) {
+ mlog(0, "lockres recovering/migrating/in-progress\n");
+ goto leave;
+ }
+
+ dlm_lock_attach_lockres(newlock, res);
+
+ status = dlmlock_master(dlm, res, newlock, be32_to_cpu(create->flags));
+leave:
+ if (status != DLM_NORMAL)
+ if (newlock)
+ dlm_lock_put(newlock);
+
+ if (res)
+ dlm_lockres_put(res);
+
+ dlm_put(dlm);
+
+ return status;
+}
+
+
+/* fetch next node-local (u8 nodenum + u56 cookie) into u64 */
+static inline void dlm_get_next_cookie(u8 node_num, u64 *cookie)
+{
+ u64 tmpnode = node_num;
+
+ /* shift single byte of node num into top 8 bits */
+ tmpnode <<= 56;
+
+ spin_lock(&dlm_cookie_lock);
+ *cookie = (dlm_next_cookie | tmpnode);
+ if (++dlm_next_cookie & 0xff00000000000000ull) {
+ mlog(0, "This node's cookie will now wrap!\n");
+ dlm_next_cookie = 1;
+ }
+ spin_unlock(&dlm_cookie_lock);
+}
+
+enum dlm_status dlmlock(struct dlm_ctxt *dlm, int mode,
+ struct dlm_lockstatus *lksb, int flags,
+ const char *name, dlm_astlockfunc_t *ast, void *data,
+ dlm_bastlockfunc_t *bast)
+{
+ enum dlm_status status;
+ struct dlm_lock_resource *res = NULL;
+ struct dlm_lock *lock = NULL;
+ int convert = 0, recovery = 0;
+
+ /* yes this function is a mess.
+ * TODO: clean this up. lots of common code in the
+ * lock and convert paths, especially in the retry blocks */
+ if (!lksb) {
+ dlm_error(DLM_BADARGS);
+ return DLM_BADARGS;
+ }
+
+ status = DLM_BADPARAM;
+ if (mode != LKM_EXMODE && mode != LKM_PRMODE && mode != LKM_NLMODE) {
+ dlm_error(status);
+ goto error;
+ }
+
+ if (flags & ~LKM_VALID_FLAGS) {
+ dlm_error(status);
+ goto error;
+ }
+
+ convert = (flags & LKM_CONVERT);
+ recovery = (flags & LKM_RECOVERY);
+
+ if (recovery &&
+ (!dlm_is_recovery_lock(name, strlen(name)) || convert) ) {
+ dlm_error(status);
+ goto error;
+ }
+ if (convert && (flags & LKM_LOCAL)) {
+ mlog(ML_ERROR, "strange LOCAL convert request!\n");
+ goto error;
+ }
+
+ if (convert) {
+ /* CONVERT request */
+
+ /* if converting, must pass in a valid dlm_lock */
+ lock = lksb->lockid;
+ if (!lock) {
+ mlog(ML_ERROR, "NULL lock pointer in convert "
+ "request\n");
+ goto error;
+ }
+
+ res = lock->lockres;
+ if (!res) {
+ mlog(ML_ERROR, "NULL lockres pointer in convert "
+ "request\n");
+ goto error;
+ }
+ dlm_lockres_get(res);
+
+ /* XXX: for ocfs2 purposes, the ast/bast/astdata/lksb are
+ * static after the original lock call. convert requests will
+ * ensure that everything is the same, or return DLM_BADARGS.
+ * this means that DLM_DENIED_NOASTS will never be returned.
+ */
+ if (lock->lksb != lksb || lock->ast != ast ||
+ lock->bast != bast || lock->astdata != data) {
+ status = DLM_BADARGS;
+ mlog(ML_ERROR, "new args: lksb=%p, ast=%p, bast=%p, "
+ "astdata=%p\n", lksb, ast, bast, data);
+ mlog(ML_ERROR, "orig args: lksb=%p, ast=%p, bast=%p, "
+ "astdata=%p\n", lock->lksb, lock->ast,
+ lock->bast, lock->astdata);
+ goto error;
+ }
+retry_convert:
+ dlm_wait_for_recovery(dlm);
+
+ if (res->owner == dlm->node_num)
+ status = dlmconvert_master(dlm, res, lock, flags, mode);
+ else
+ status = dlmconvert_remote(dlm, res, lock, flags, mode);
+ if (status == DLM_RECOVERING || status == DLM_MIGRATING ||
+ status == DLM_FORWARD) {
+ /* for now, see how this works without sleeping
+ * and just retry right away. I suspect the reco
+ * or migration will complete fast enough that
+ * no waiting will be necessary */
+ mlog(0, "retrying convert with migration/recovery/"
+ "in-progress\n");
+ msleep(100);
+ goto retry_convert;
+ }
+ } else {
+ u64 tmpcookie;
+
+ /* LOCK request */
+ status = DLM_BADARGS;
+ if (!name) {
+ dlm_error(status);
+ goto error;
+ }
+
+ status = DLM_IVBUFLEN;
+ if (strlen(name) > DLM_LOCKID_NAME_MAX || strlen(name) < 1) {
+ dlm_error(status);
+ goto error;
+ }
+
+ dlm_get_next_cookie(dlm->node_num, &tmpcookie);
+ lock = dlm_new_lock(mode, dlm->node_num, tmpcookie, lksb);
+ if (!lock) {
+ dlm_error(status);
+ goto error;
+ }
+
+ if (!recovery)
+ dlm_wait_for_recovery(dlm);
+
+ /* find or create the lock resource */
+ res = dlm_get_lock_resource(dlm, name, flags);
+ if (!res) {
+ status = DLM_IVLOCKID;
+ dlm_error(status);
+ goto error;
+ }
+
+ mlog(0, "type=%d, flags = 0x%x\n", mode, flags);
+ mlog(0, "creating lock: lock=%p res=%p\n", lock, res);
+
+ dlm_lock_attach_lockres(lock, res);
+ lock->ast = ast;
+ lock->bast = bast;
+ lock->astdata = data;
+
+retry_lock:
+ if (flags & LKM_VALBLK) {
+ mlog(0, "LKM_VALBLK passed by caller\n");
+
+ /* LVB requests for non PR, PW or EX locks are
+ * ignored. */
+ if (mode < LKM_PRMODE)
+ flags &= ~LKM_VALBLK;
+ else {
+ flags |= LKM_GET_LVB;
+ lock->lksb->flags |= DLM_LKSB_GET_LVB;
+ }
+ }
+
+ if (res->owner == dlm->node_num)
+ status = dlmlock_master(dlm, res, lock, flags);
+ else
+ status = dlmlock_remote(dlm, res, lock, flags);
+
+ if (status == DLM_RECOVERING || status == DLM_MIGRATING ||
+ status == DLM_FORWARD) {
+ mlog(0, "retrying lock with migration/"
+ "recovery/in progress\n");
+ msleep(100);
+ dlm_wait_for_recovery(dlm);
+ goto retry_lock;
+ }
+
+ if (status != DLM_NORMAL) {
+ lock->lksb->flags &= ~DLM_LKSB_GET_LVB;
+ if (status != DLM_NOTQUEUED)
+ dlm_error(status);
+ goto error;
+ }
+ }
+
+error:
+ if (status != DLM_NORMAL) {
+ if (lock && !convert)
+ dlm_lock_put(lock);
+ // this is kind of unnecessary
+ lksb->status = status;
+ }
+
+ /* put lockres ref from the convert path
+ * or from dlm_get_lock_resource */
+ if (res)
+ dlm_lockres_put(res);
+
+ return status;
+}
+EXPORT_SYMBOL_GPL(dlmlock);
--- /dev/null
+/* -*- mode: c; c-basic-offset: 8; -*-
+ * vim: noexpandtab sw=8 ts=8 sts=0:
+ *
+ * dlmmod.c
+ *
+ * standalone DLM module
+ *
+ * Copyright (C) 2004 Oracle. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ *
+ */
+
+
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/highmem.h>
+#include <linux/utsname.h>
+#include <linux/init.h>
+#include <linux/sysctl.h>
+#include <linux/random.h>
+#include <linux/blkdev.h>
+#include <linux/socket.h>
+#include <linux/inet.h>
+#include <linux/spinlock.h>
+#include <linux/delay.h>
+
+
+#include "cluster/heartbeat.h"
+#include "cluster/nodemanager.h"
+#include "cluster/tcp.h"
+
+#include "dlmapi.h"
+#include "dlmcommon.h"
+#include "dlmdebug.h"
+
+#define MLOG_MASK_PREFIX (ML_DLM|ML_DLM_MASTER)
+#include "cluster/masklog.h"
+
+enum dlm_mle_type {
+ DLM_MLE_BLOCK,
+ DLM_MLE_MASTER,
+ DLM_MLE_MIGRATION
+};
+
+struct dlm_lock_name
+{
+ u8 len;
+ u8 name[DLM_LOCKID_NAME_MAX];
+};
+
+struct dlm_master_list_entry
+{
+ struct list_head list;
+ struct list_head hb_events;
+ struct dlm_ctxt *dlm;
+ spinlock_t spinlock;
+ wait_queue_head_t wq;
+ atomic_t woken;
+ struct kref mle_refs;
+ unsigned long maybe_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
+ unsigned long vote_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
+ unsigned long response_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
+ unsigned long node_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
+ u8 master;
+ u8 new_master;
+ enum dlm_mle_type type;
+ struct o2hb_callback_func mle_hb_up;
+ struct o2hb_callback_func mle_hb_down;
+ union {
+ struct dlm_lock_resource *res;
+ struct dlm_lock_name name;
+ } u;
+};
+
+static void dlm_mle_node_down(struct dlm_ctxt *dlm,
+ struct dlm_master_list_entry *mle,
+ struct o2nm_node *node,
+ int idx);
+static void dlm_mle_node_up(struct dlm_ctxt *dlm,
+ struct dlm_master_list_entry *mle,
+ struct o2nm_node *node,
+ int idx);
+
+static void dlm_assert_master_worker(struct dlm_work_item *item, void *data);
+static int dlm_do_assert_master(struct dlm_ctxt *dlm, const char *lockname,
+ unsigned int namelen, void *nodemap,
+ u32 flags);
+
+static inline int dlm_mle_equal(struct dlm_ctxt *dlm,
+ struct dlm_master_list_entry *mle,
+ const char *name,
+ unsigned int namelen)
+{
+ struct dlm_lock_resource *res;
+
+ if (dlm != mle->dlm)
+ return 0;
+
+ if (mle->type == DLM_MLE_BLOCK ||
+ mle->type == DLM_MLE_MIGRATION) {
+ if (namelen != mle->u.name.len ||
+ memcmp(name, mle->u.name.name, namelen)!=0)
+ return 0;
+ } else {
+ res = mle->u.res;
+ if (namelen != res->lockname.len ||
+ memcmp(res->lockname.name, name, namelen) != 0)
+ return 0;
+ }
+ return 1;
+}
+
+#if 0
+/* Code here is included but defined out as it aids debugging */
+
+void dlm_print_one_mle(struct dlm_master_list_entry *mle)
+{
+ int i = 0, refs;
+ char *type;
+ char attached;
+ u8 master;
+ unsigned int namelen;
+ const char *name;
+ struct kref *k;
+
+ k = &mle->mle_refs;
+ if (mle->type == DLM_MLE_BLOCK)
+ type = "BLK";
+ else if (mle->type == DLM_MLE_MASTER)
+ type = "MAS";
+ else
+ type = "MIG";
+ refs = atomic_read(&k->refcount);
+ master = mle->master;
+ attached = (list_empty(&mle->hb_events) ? 'N' : 'Y');
+
+ if (mle->type != DLM_MLE_MASTER) {
+ namelen = mle->u.name.len;
+ name = mle->u.name.name;
+ } else {
+ namelen = mle->u.res->lockname.len;
+ name = mle->u.res->lockname.name;
+ }
+
+ mlog(ML_NOTICE, " #%3d: %3s %3d %3u %3u %c (%d)%.*s\n",
+ i, type, refs, master, mle->new_master, attached,
+ namelen, namelen, name);
+}
+
+static void dlm_dump_mles(struct dlm_ctxt *dlm)
+{
+ struct dlm_master_list_entry *mle;
+ struct list_head *iter;
+
+ mlog(ML_NOTICE, "dumping all mles for domain %s:\n", dlm->name);
+ mlog(ML_NOTICE, " ####: type refs owner new events? lockname nodemap votemap respmap maybemap\n");
+ spin_lock(&dlm->master_lock);
+ list_for_each(iter, &dlm->master_list) {
+ mle = list_entry(iter, struct dlm_master_list_entry, list);
+ dlm_print_one_mle(mle);
+ }
+ spin_unlock(&dlm->master_lock);
+}
+
+extern spinlock_t dlm_domain_lock;
+extern struct list_head dlm_domains;
+
+int dlm_dump_all_mles(const char __user *data, unsigned int len)
+{
+ struct list_head *iter;
+ struct dlm_ctxt *dlm;
+
+ spin_lock(&dlm_domain_lock);
+ list_for_each(iter, &dlm_domains) {
+ dlm = list_entry (iter, struct dlm_ctxt, list);
+ mlog(ML_NOTICE, "found dlm: %p, name=%s\n", dlm, dlm->name);
+ dlm_dump_mles(dlm);
+ }
+ spin_unlock(&dlm_domain_lock);
+ return len;
+}
+EXPORT_SYMBOL_GPL(dlm_dump_all_mles);
+
+#endif /* 0 */
+
+
+static kmem_cache_t *dlm_mle_cache = NULL;
+
+
+static void dlm_mle_release(struct kref *kref);
+static void dlm_init_mle(struct dlm_master_list_entry *mle,
+ enum dlm_mle_type type,
+ struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res,
+ const char *name,
+ unsigned int namelen);
+static void dlm_put_mle(struct dlm_master_list_entry *mle);
+static void __dlm_put_mle(struct dlm_master_list_entry *mle);
+static int dlm_find_mle(struct dlm_ctxt *dlm,
+ struct dlm_master_list_entry **mle,
+ char *name, unsigned int namelen);
+
+static int dlm_do_master_request(struct dlm_master_list_entry *mle, int to);
+
+
+static int dlm_wait_for_lock_mastery(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res,
+ struct dlm_master_list_entry *mle,
+ int *blocked);
+static int dlm_restart_lock_mastery(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res,
+ struct dlm_master_list_entry *mle,
+ int blocked);
+static int dlm_add_migration_mle(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res,
+ struct dlm_master_list_entry *mle,
+ struct dlm_master_list_entry **oldmle,
+ const char *name, unsigned int namelen,
+ u8 new_master, u8 master);
+
+static u8 dlm_pick_migration_target(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res);
+static void dlm_remove_nonlocal_locks(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res);
+static int dlm_mark_lockres_migrating(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res,
+ u8 target);
+
+
+int dlm_is_host_down(int errno)
+{
+ switch (errno) {
+ case -EBADF:
+ case -ECONNREFUSED:
+ case -ENOTCONN:
+ case -ECONNRESET:
+ case -EPIPE:
+ case -EHOSTDOWN:
+ case -EHOSTUNREACH:
+ case -ETIMEDOUT:
+ case -ECONNABORTED:
+ case -ENETDOWN:
+ case -ENETUNREACH:
+ case -ENETRESET:
+ case -ESHUTDOWN:
+ case -ENOPROTOOPT:
+ case -EINVAL: /* if returned from our tcp code,
+ this means there is no socket */
+ return 1;
+ }
+ return 0;
+}
+
+
+/*
+ * MASTER LIST FUNCTIONS
+ */
+
+
+/*
+ * regarding master list entries and heartbeat callbacks:
+ *
+ * in order to avoid sleeping and allocation that occurs in
+ * heartbeat, master list entries are simply attached to the
+ * dlm's established heartbeat callbacks. the mle is attached
+ * when it is created, and since the dlm->spinlock is held at
+ * that time, any heartbeat event will be properly discovered
+ * by the mle. the mle needs to be detached from the
+ * dlm->mle_hb_events list as soon as heartbeat events are no
+ * longer useful to the mle, and before the mle is freed.
+ *
+ * as a general rule, heartbeat events are no longer needed by
+ * the mle once an "answer" regarding the lock master has been
+ * received.
+ */
+static inline void __dlm_mle_attach_hb_events(struct dlm_ctxt *dlm,
+ struct dlm_master_list_entry *mle)
+{
+ assert_spin_locked(&dlm->spinlock);
+
+ list_add_tail(&mle->hb_events, &dlm->mle_hb_events);
+}
+
+
+static inline void __dlm_mle_detach_hb_events(struct dlm_ctxt *dlm,
+ struct dlm_master_list_entry *mle)
+{
+ if (!list_empty(&mle->hb_events))
+ list_del_init(&mle->hb_events);
+}
+
+
+static inline void dlm_mle_detach_hb_events(struct dlm_ctxt *dlm,
+ struct dlm_master_list_entry *mle)
+{
+ spin_lock(&dlm->spinlock);
+ __dlm_mle_detach_hb_events(dlm, mle);
+ spin_unlock(&dlm->spinlock);
+}
+
+/* remove from list and free */
+static void __dlm_put_mle(struct dlm_master_list_entry *mle)
+{
+ struct dlm_ctxt *dlm;
+ dlm = mle->dlm;
+
+ assert_spin_locked(&dlm->spinlock);
+ assert_spin_locked(&dlm->master_lock);
+ BUG_ON(!atomic_read(&mle->mle_refs.refcount));
+
+ kref_put(&mle->mle_refs, dlm_mle_release);
+}
+
+
+/* must not have any spinlocks coming in */
+static void dlm_put_mle(struct dlm_master_list_entry *mle)
+{
+ struct dlm_ctxt *dlm;
+ dlm = mle->dlm;
+
+ spin_lock(&dlm->spinlock);
+ spin_lock(&dlm->master_lock);
+ __dlm_put_mle(mle);
+ spin_unlock(&dlm->master_lock);
+ spin_unlock(&dlm->spinlock);
+}
+
+static inline void dlm_get_mle(struct dlm_master_list_entry *mle)
+{
+ kref_get(&mle->mle_refs);
+}
+
+static void dlm_init_mle(struct dlm_master_list_entry *mle,
+ enum dlm_mle_type type,
+ struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res,
+ const char *name,
+ unsigned int namelen)
+{
+ assert_spin_locked(&dlm->spinlock);
+
+ mle->dlm = dlm;
+ mle->type = type;
+ INIT_LIST_HEAD(&mle->list);
+ INIT_LIST_HEAD(&mle->hb_events);
+ memset(mle->maybe_map, 0, sizeof(mle->maybe_map));
+ spin_lock_init(&mle->spinlock);
+ init_waitqueue_head(&mle->wq);
+ atomic_set(&mle->woken, 0);
+ kref_init(&mle->mle_refs);
+ memset(mle->response_map, 0, sizeof(mle->response_map));
+ mle->master = O2NM_MAX_NODES;
+ mle->new_master = O2NM_MAX_NODES;
+
+ if (mle->type == DLM_MLE_MASTER) {
+ BUG_ON(!res);
+ mle->u.res = res;
+ } else if (mle->type == DLM_MLE_BLOCK) {
+ BUG_ON(!name);
+ memcpy(mle->u.name.name, name, namelen);
+ mle->u.name.len = namelen;
+ } else /* DLM_MLE_MIGRATION */ {
+ BUG_ON(!name);
+ memcpy(mle->u.name.name, name, namelen);
+ mle->u.name.len = namelen;
+ }
+
+ /* copy off the node_map and register hb callbacks on our copy */
+ memcpy(mle->node_map, dlm->domain_map, sizeof(mle->node_map));
+ memcpy(mle->vote_map, dlm->domain_map, sizeof(mle->vote_map));
+ clear_bit(dlm->node_num, mle->vote_map);
+ clear_bit(dlm->node_num, mle->node_map);
+
+ /* attach the mle to the domain node up/down events */
+ __dlm_mle_attach_hb_events(dlm, mle);
+}
+
+
+/* returns 1 if found, 0 if not */
+static int dlm_find_mle(struct dlm_ctxt *dlm,
+ struct dlm_master_list_entry **mle,
+ char *name, unsigned int namelen)
+{
+ struct dlm_master_list_entry *tmpmle;
+ struct list_head *iter;
+
+ assert_spin_locked(&dlm->master_lock);
+
+ list_for_each(iter, &dlm->master_list) {
+ tmpmle = list_entry(iter, struct dlm_master_list_entry, list);
+ if (!dlm_mle_equal(dlm, tmpmle, name, namelen))
+ continue;
+ dlm_get_mle(tmpmle);
+ *mle = tmpmle;
+ return 1;
+ }
+ return 0;
+}
+
+void dlm_hb_event_notify_attached(struct dlm_ctxt *dlm, int idx, int node_up)
+{
+ struct dlm_master_list_entry *mle;
+ struct list_head *iter;
+
+ assert_spin_locked(&dlm->spinlock);
+
+ list_for_each(iter, &dlm->mle_hb_events) {
+ mle = list_entry(iter, struct dlm_master_list_entry,
+ hb_events);
+ if (node_up)
+ dlm_mle_node_up(dlm, mle, NULL, idx);
+ else
+ dlm_mle_node_down(dlm, mle, NULL, idx);
+ }
+}
+
+static void dlm_mle_node_down(struct dlm_ctxt *dlm,
+ struct dlm_master_list_entry *mle,
+ struct o2nm_node *node, int idx)
+{
+ spin_lock(&mle->spinlock);
+
+ if (!test_bit(idx, mle->node_map))
+ mlog(0, "node %u already removed from nodemap!\n", idx);
+ else
+ clear_bit(idx, mle->node_map);
+
+ spin_unlock(&mle->spinlock);
+}
+
+static void dlm_mle_node_up(struct dlm_ctxt *dlm,
+ struct dlm_master_list_entry *mle,
+ struct o2nm_node *node, int idx)
+{
+ spin_lock(&mle->spinlock);
+
+ if (test_bit(idx, mle->node_map))
+ mlog(0, "node %u already in node map!\n", idx);
+ else
+ set_bit(idx, mle->node_map);
+
+ spin_unlock(&mle->spinlock);
+}
+
+
+int dlm_init_mle_cache(void)
+{
+ dlm_mle_cache = kmem_cache_create("dlm_mle_cache",
+ sizeof(struct dlm_master_list_entry),
+ 0, SLAB_HWCACHE_ALIGN,
+ NULL, NULL);
+ if (dlm_mle_cache == NULL)
+ return -ENOMEM;
+ return 0;
+}
+
+void dlm_destroy_mle_cache(void)
+{
+ if (dlm_mle_cache)
+ kmem_cache_destroy(dlm_mle_cache);
+}
+
+static void dlm_mle_release(struct kref *kref)
+{
+ struct dlm_master_list_entry *mle;
+ struct dlm_ctxt *dlm;
+
+ mlog_entry_void();
+
+ mle = container_of(kref, struct dlm_master_list_entry, mle_refs);
+ dlm = mle->dlm;
+
+ if (mle->type != DLM_MLE_MASTER) {
+ mlog(0, "calling mle_release for %.*s, type %d\n",
+ mle->u.name.len, mle->u.name.name, mle->type);
+ } else {
+ mlog(0, "calling mle_release for %.*s, type %d\n",
+ mle->u.res->lockname.len,
+ mle->u.res->lockname.name, mle->type);
+ }
+ assert_spin_locked(&dlm->spinlock);
+ assert_spin_locked(&dlm->master_lock);
+
+ /* remove from list if not already */
+ if (!list_empty(&mle->list))
+ list_del_init(&mle->list);
+
+ /* detach the mle from the domain node up/down events */
+ __dlm_mle_detach_hb_events(dlm, mle);
+
+ /* NOTE: kfree under spinlock here.
+ * if this is bad, we can move this to a freelist. */
+ kmem_cache_free(dlm_mle_cache, mle);
+}
+
+
+/*
+ * LOCK RESOURCE FUNCTIONS
+ */
+
+static void dlm_set_lockres_owner(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res,
+ u8 owner)
+{
+ assert_spin_locked(&res->spinlock);
+
+ mlog_entry("%.*s, %u\n", res->lockname.len, res->lockname.name, owner);
+
+ if (owner == dlm->node_num)
+ atomic_inc(&dlm->local_resources);
+ else if (owner == DLM_LOCK_RES_OWNER_UNKNOWN)
+ atomic_inc(&dlm->unknown_resources);
+ else
+ atomic_inc(&dlm->remote_resources);
+
+ res->owner = owner;
+}
+
+void dlm_change_lockres_owner(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res, u8 owner)
+{
+ assert_spin_locked(&res->spinlock);
+
+ if (owner == res->owner)
+ return;
+
+ if (res->owner == dlm->node_num)
+ atomic_dec(&dlm->local_resources);
+ else if (res->owner == DLM_LOCK_RES_OWNER_UNKNOWN)
+ atomic_dec(&dlm->unknown_resources);
+ else
+ atomic_dec(&dlm->remote_resources);
+
+ dlm_set_lockres_owner(dlm, res, owner);
+}
+
+
+static void dlm_lockres_release(struct kref *kref)
+{
+ struct dlm_lock_resource *res;
+
+ res = container_of(kref, struct dlm_lock_resource, refs);
+
+ /* This should not happen -- all lockres' have a name
+ * associated with them at init time. */
+ BUG_ON(!res->lockname.name);
+
+ mlog(0, "destroying lockres %.*s\n", res->lockname.len,
+ res->lockname.name);
+
+ /* By the time we're ready to blow this guy away, we shouldn't
+ * be on any lists. */
+ BUG_ON(!list_empty(&res->list));
+ BUG_ON(!list_empty(&res->granted));
+ BUG_ON(!list_empty(&res->converting));
+ BUG_ON(!list_empty(&res->blocked));
+ BUG_ON(!list_empty(&res->dirty));
+ BUG_ON(!list_empty(&res->recovering));
+ BUG_ON(!list_empty(&res->purge));
+
+ kfree(res->lockname.name);
+
+ kfree(res);
+}
+
+void dlm_lockres_get(struct dlm_lock_resource *res)
+{
+ kref_get(&res->refs);
+}
+
+void dlm_lockres_put(struct dlm_lock_resource *res)
+{
+ kref_put(&res->refs, dlm_lockres_release);
+}
+
+static void dlm_init_lockres(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res,
+ const char *name, unsigned int namelen)
+{
+ char *qname;
+
+ /* If we memset here, we lose our reference to the kmalloc'd
+ * res->lockname.name, so be sure to init every field
+ * correctly! */
+
+ qname = (char *) res->lockname.name;
+ memcpy(qname, name, namelen);
+
+ res->lockname.len = namelen;
+ res->lockname.hash = full_name_hash(name, namelen);
+
+ init_waitqueue_head(&res->wq);
+ spin_lock_init(&res->spinlock);
+ INIT_LIST_HEAD(&res->list);
+ INIT_LIST_HEAD(&res->granted);
+ INIT_LIST_HEAD(&res->converting);
+ INIT_LIST_HEAD(&res->blocked);
+ INIT_LIST_HEAD(&res->dirty);
+ INIT_LIST_HEAD(&res->recovering);
+ INIT_LIST_HEAD(&res->purge);
+ atomic_set(&res->asts_reserved, 0);
+ res->migration_pending = 0;
+
+ kref_init(&res->refs);
+
+ /* just for consistency */
+ spin_lock(&res->spinlock);
+ dlm_set_lockres_owner(dlm, res, DLM_LOCK_RES_OWNER_UNKNOWN);
+ spin_unlock(&res->spinlock);
+
+ res->state = DLM_LOCK_RES_IN_PROGRESS;
+
+ res->last_used = 0;
+
+ memset(res->lvb, 0, DLM_LVB_LEN);
+}
+
+struct dlm_lock_resource *dlm_new_lockres(struct dlm_ctxt *dlm,
+ const char *name,
+ unsigned int namelen)
+{
+ struct dlm_lock_resource *res;
+
+ res = kmalloc(sizeof(struct dlm_lock_resource), GFP_KERNEL);
+ if (!res)
+ return NULL;
+
+ res->lockname.name = kmalloc(namelen, GFP_KERNEL);
+ if (!res->lockname.name) {
+ kfree(res);
+ return NULL;
+ }
+
+ dlm_init_lockres(dlm, res, name, namelen);
+ return res;
+}
+
+/*
+ * lookup a lock resource by name.
+ * may already exist in the hashtable.
+ * lockid is null terminated
+ *
+ * if not, allocate enough for the lockres and for
+ * the temporary structure used in doing the mastering.
+ *
+ * also, do a lookup in the dlm->master_list to see
+ * if another node has begun mastering the same lock.
+ * if so, there should be a block entry in there
+ * for this name, and we should *not* attempt to master
+ * the lock here. need to wait around for that node
+ * to assert_master (or die).
+ *
+ */
+struct dlm_lock_resource * dlm_get_lock_resource(struct dlm_ctxt *dlm,
+ const char *lockid,
+ int flags)
+{
+ struct dlm_lock_resource *tmpres=NULL, *res=NULL;
+ struct dlm_master_list_entry *mle = NULL;
+ struct dlm_master_list_entry *alloc_mle = NULL;
+ int blocked = 0;
+ int ret, nodenum;
+ struct dlm_node_iter iter;
+ unsigned int namelen;
+ int tries = 0;
+
+ BUG_ON(!lockid);
+
+ namelen = strlen(lockid);
+
+ mlog(0, "get lockres %s (len %d)\n", lockid, namelen);
+
+lookup:
+ spin_lock(&dlm->spinlock);
+ tmpres = __dlm_lookup_lockres(dlm, lockid, namelen);
+ if (tmpres) {
+ spin_unlock(&dlm->spinlock);
+ mlog(0, "found in hash!\n");
+ if (res)
+ dlm_lockres_put(res);
+ res = tmpres;
+ goto leave;
+ }
+
+ if (!res) {
+ spin_unlock(&dlm->spinlock);
+ mlog(0, "allocating a new resource\n");
+ /* nothing found and we need to allocate one. */
+ alloc_mle = (struct dlm_master_list_entry *)
+ kmem_cache_alloc(dlm_mle_cache, GFP_KERNEL);
+ if (!alloc_mle)
+ goto leave;
+ res = dlm_new_lockres(dlm, lockid, namelen);
+ if (!res)
+ goto leave;
+ goto lookup;
+ }
+
+ mlog(0, "no lockres found, allocated our own: %p\n", res);
+
+ if (flags & LKM_LOCAL) {
+ /* caller knows it's safe to assume it's not mastered elsewhere
+ * DONE! return right away */
+ spin_lock(&res->spinlock);
+ dlm_change_lockres_owner(dlm, res, dlm->node_num);
+ __dlm_insert_lockres(dlm, res);
+ spin_unlock(&res->spinlock);
+ spin_unlock(&dlm->spinlock);
+ /* lockres still marked IN_PROGRESS */
+ goto wake_waiters;
+ }
+
+ /* check master list to see if another node has started mastering it */
+ spin_lock(&dlm->master_lock);
+
+ /* if we found a block, wait for lock to be mastered by another node */
+ blocked = dlm_find_mle(dlm, &mle, (char *)lockid, namelen);
+ if (blocked) {
+ if (mle->type == DLM_MLE_MASTER) {
+ mlog(ML_ERROR, "master entry for nonexistent lock!\n");
+ BUG();
+ } else if (mle->type == DLM_MLE_MIGRATION) {
+ /* migration is in progress! */
+ /* the good news is that we now know the
+ * "current" master (mle->master). */
+
+ spin_unlock(&dlm->master_lock);
+ assert_spin_locked(&dlm->spinlock);
+
+ /* set the lockres owner and hash it */
+ spin_lock(&res->spinlock);
+ dlm_set_lockres_owner(dlm, res, mle->master);
+ __dlm_insert_lockres(dlm, res);
+ spin_unlock(&res->spinlock);
+ spin_unlock(&dlm->spinlock);
+
+ /* master is known, detach */
+ dlm_mle_detach_hb_events(dlm, mle);
+ dlm_put_mle(mle);
+ mle = NULL;
+ goto wake_waiters;
+ }
+ } else {
+ /* go ahead and try to master lock on this node */
+ mle = alloc_mle;
+ /* make sure this does not get freed below */
+ alloc_mle = NULL;
+ dlm_init_mle(mle, DLM_MLE_MASTER, dlm, res, NULL, 0);
+ set_bit(dlm->node_num, mle->maybe_map);
+ list_add(&mle->list, &dlm->master_list);
+ }
+
+ /* at this point there is either a DLM_MLE_BLOCK or a
+ * DLM_MLE_MASTER on the master list, so it's safe to add the
+ * lockres to the hashtable. anyone who finds the lock will
+ * still have to wait on the IN_PROGRESS. */
+
+ /* finally add the lockres to its hash bucket */
+ __dlm_insert_lockres(dlm, res);
+ /* get an extra ref on the mle in case this is a BLOCK
+ * if so, the creator of the BLOCK may try to put the last
+ * ref at this time in the assert master handler, so we
+ * need an extra one to keep from a bad ptr deref. */
+ dlm_get_mle(mle);
+ spin_unlock(&dlm->master_lock);
+ spin_unlock(&dlm->spinlock);
+
+ /* must wait for lock to be mastered elsewhere */
+ if (blocked)
+ goto wait;
+
+redo_request:
+ ret = -EINVAL;
+ dlm_node_iter_init(mle->vote_map, &iter);
+ while ((nodenum = dlm_node_iter_next(&iter)) >= 0) {
+ ret = dlm_do_master_request(mle, nodenum);
+ if (ret < 0)
+ mlog_errno(ret);
+ if (mle->master != O2NM_MAX_NODES) {
+ /* found a master ! */
+ break;
+ }
+ }
+
+wait:
+ /* keep going until the response map includes all nodes */
+ ret = dlm_wait_for_lock_mastery(dlm, res, mle, &blocked);
+ if (ret < 0) {
+ mlog(0, "%s:%.*s: node map changed, redo the "
+ "master request now, blocked=%d\n",
+ dlm->name, res->lockname.len,
+ res->lockname.name, blocked);
+ if (++tries > 20) {
+ mlog(ML_ERROR, "%s:%.*s: spinning on "
+ "dlm_wait_for_lock_mastery, blocked=%d\n",
+ dlm->name, res->lockname.len,
+ res->lockname.name, blocked);
+ dlm_print_one_lock_resource(res);
+ /* dlm_print_one_mle(mle); */
+ tries = 0;
+ }
+ goto redo_request;
+ }
+
+ mlog(0, "lockres mastered by %u\n", res->owner);
+ /* make sure we never continue without this */
+ BUG_ON(res->owner == O2NM_MAX_NODES);
+
+ /* master is known, detach if not already detached */
+ dlm_mle_detach_hb_events(dlm, mle);
+ dlm_put_mle(mle);
+ /* put the extra ref */
+ dlm_put_mle(mle);
+
+wake_waiters:
+ spin_lock(&res->spinlock);
+ res->state &= ~DLM_LOCK_RES_IN_PROGRESS;
+ spin_unlock(&res->spinlock);
+ wake_up(&res->wq);
+
+leave:
+ /* need to free the unused mle */
+ if (alloc_mle)
+ kmem_cache_free(dlm_mle_cache, alloc_mle);
+
+ return res;
+}
+
+
+#define DLM_MASTERY_TIMEOUT_MS 5000
+
+static int dlm_wait_for_lock_mastery(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res,
+ struct dlm_master_list_entry *mle,
+ int *blocked)
+{
+ u8 m;
+ int ret, bit;
+ int map_changed, voting_done;
+ int assert, sleep;
+
+recheck:
+ ret = 0;
+ assert = 0;
+
+ /* check if another node has already become the owner */
+ spin_lock(&res->spinlock);
+ if (res->owner != DLM_LOCK_RES_OWNER_UNKNOWN) {
+ spin_unlock(&res->spinlock);
+ goto leave;
+ }
+ spin_unlock(&res->spinlock);
+
+ spin_lock(&mle->spinlock);
+ m = mle->master;
+ map_changed = (memcmp(mle->vote_map, mle->node_map,
+ sizeof(mle->vote_map)) != 0);
+ voting_done = (memcmp(mle->vote_map, mle->response_map,
+ sizeof(mle->vote_map)) == 0);
+
+ /* restart if we hit any errors */
+ if (map_changed) {
+ int b;
+ mlog(0, "%s: %.*s: node map changed, restarting\n",
+ dlm->name, res->lockname.len, res->lockname.name);
+ ret = dlm_restart_lock_mastery(dlm, res, mle, *blocked);
+ b = (mle->type == DLM_MLE_BLOCK);
+ if ((*blocked && !b) || (!*blocked && b)) {
+ mlog(0, "%s:%.*s: status change: old=%d new=%d\n",
+ dlm->name, res->lockname.len, res->lockname.name,
+ *blocked, b);
+ *blocked = b;
+ }
+ spin_unlock(&mle->spinlock);
+ if (ret < 0) {
+ mlog_errno(ret);
+ goto leave;
+ }
+ mlog(0, "%s:%.*s: restart lock mastery succeeded, "
+ "rechecking now\n", dlm->name, res->lockname.len,
+ res->lockname.name);
+ goto recheck;
+ }
+
+ if (m != O2NM_MAX_NODES) {
+ /* another node has done an assert!
+ * all done! */
+ sleep = 0;
+ } else {
+ sleep = 1;
+ /* have all nodes responded? */
+ if (voting_done && !*blocked) {
+ bit = find_next_bit(mle->maybe_map, O2NM_MAX_NODES, 0);
+ if (dlm->node_num <= bit) {
+ /* my node number is lowest.
+ * now tell other nodes that I am
+ * mastering this. */
+ mle->master = dlm->node_num;
+ assert = 1;
+ sleep = 0;
+ }
+ /* if voting is done, but we have not received
+ * an assert master yet, we must sleep */
+ }
+ }
+
+ spin_unlock(&mle->spinlock);
+
+ /* sleep if we haven't finished voting yet */
+ if (sleep) {
+ unsigned long timeo = msecs_to_jiffies(DLM_MASTERY_TIMEOUT_MS);
+
+ /*
+ if (atomic_read(&mle->mle_refs.refcount) < 2)
+ mlog(ML_ERROR, "mle (%p) refs=%d, name=%.*s\n", mle,
+ atomic_read(&mle->mle_refs.refcount),
+ res->lockname.len, res->lockname.name);
+ */
+ atomic_set(&mle->woken, 0);
+ (void)wait_event_timeout(mle->wq,
+ (atomic_read(&mle->woken) == 1),
+ timeo);
+ if (res->owner == O2NM_MAX_NODES) {
+ mlog(0, "waiting again\n");
+ goto recheck;
+ }
+ mlog(0, "done waiting, master is %u\n", res->owner);
+ ret = 0;
+ goto leave;
+ }
+
+ ret = 0; /* done */
+ if (assert) {
+ m = dlm->node_num;
+ mlog(0, "about to master %.*s here, this=%u\n",
+ res->lockname.len, res->lockname.name, m);
+ ret = dlm_do_assert_master(dlm, res->lockname.name,
+ res->lockname.len, mle->vote_map, 0);
+ if (ret) {
+ /* This is a failure in the network path,
+ * not in the response to the assert_master
+ * (any nonzero response is a BUG on this node).
+ * Most likely a socket just got disconnected
+ * due to node death. */
+ mlog_errno(ret);
+ }
+ /* no longer need to restart lock mastery.
+ * all living nodes have been contacted. */
+ ret = 0;
+ }
+
+ /* set the lockres owner */
+ spin_lock(&res->spinlock);
+ dlm_change_lockres_owner(dlm, res, m);
+ spin_unlock(&res->spinlock);
+
+leave:
+ return ret;
+}
+
+struct dlm_bitmap_diff_iter
+{
+ int curnode;
+ unsigned long *orig_bm;
+ unsigned long *cur_bm;
+ unsigned long diff_bm[BITS_TO_LONGS(O2NM_MAX_NODES)];
+};
+
+enum dlm_node_state_change
+{
+ NODE_DOWN = -1,
+ NODE_NO_CHANGE = 0,
+ NODE_UP
+};
+
+static void dlm_bitmap_diff_iter_init(struct dlm_bitmap_diff_iter *iter,
+ unsigned long *orig_bm,
+ unsigned long *cur_bm)
+{
+ unsigned long p1, p2;
+ int i;
+
+ iter->curnode = -1;
+ iter->orig_bm = orig_bm;
+ iter->cur_bm = cur_bm;
+
+ for (i = 0; i < BITS_TO_LONGS(O2NM_MAX_NODES); i++) {
+ p1 = *(iter->orig_bm + i);
+ p2 = *(iter->cur_bm + i);
+ iter->diff_bm[i] = (p1 & ~p2) | (p2 & ~p1);
+ }
+}
+
+static int dlm_bitmap_diff_iter_next(struct dlm_bitmap_diff_iter *iter,
+ enum dlm_node_state_change *state)
+{
+ int bit;
+
+ if (iter->curnode >= O2NM_MAX_NODES)
+ return -ENOENT;
+
+ bit = find_next_bit(iter->diff_bm, O2NM_MAX_NODES,
+ iter->curnode+1);
+ if (bit >= O2NM_MAX_NODES) {
+ iter->curnode = O2NM_MAX_NODES;
+ return -ENOENT;
+ }
+
+ /* if it was there in the original then this node died */
+ if (test_bit(bit, iter->orig_bm))
+ *state = NODE_DOWN;
+ else
+ *state = NODE_UP;
+
+ iter->curnode = bit;
+ return bit;
+}
+
+
+static int dlm_restart_lock_mastery(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res,
+ struct dlm_master_list_entry *mle,
+ int blocked)
+{
+ struct dlm_bitmap_diff_iter bdi;
+ enum dlm_node_state_change sc;
+ int node;
+ int ret = 0;
+
+ mlog(0, "something happened such that the "
+ "master process may need to be restarted!\n");
+
+ assert_spin_locked(&mle->spinlock);
+
+ dlm_bitmap_diff_iter_init(&bdi, mle->vote_map, mle->node_map);
+ node = dlm_bitmap_diff_iter_next(&bdi, &sc);
+ while (node >= 0) {
+ if (sc == NODE_UP) {
+ /* a node came up. easy. might not even need
+ * to talk to it if its node number is higher
+ * or if we are already blocked. */
+ mlog(0, "node up! %d\n", node);
+ if (blocked)
+ goto next;
+
+ if (node > dlm->node_num) {
+ mlog(0, "node > this node. skipping.\n");
+ goto next;
+ }
+
+ /* redo the master request, but only for the new node */
+ mlog(0, "sending request to new node\n");
+ clear_bit(node, mle->response_map);
+ set_bit(node, mle->vote_map);
+ } else {
+ mlog(ML_ERROR, "node down! %d\n", node);
+
+ /* if the node wasn't involved in mastery skip it,
+ * but clear it out from the maps so that it will
+ * not affect mastery of this lockres */
+ clear_bit(node, mle->response_map);
+ clear_bit(node, mle->vote_map);
+ if (!test_bit(node, mle->maybe_map))
+ goto next;
+
+ /* if we're already blocked on lock mastery, and the
+ * dead node wasn't the expected master, or there is
+ * another node in the maybe_map, keep waiting */
+ if (blocked) {
+ int lowest = find_next_bit(mle->maybe_map,
+ O2NM_MAX_NODES, 0);
+
+ /* act like it was never there */
+ clear_bit(node, mle->maybe_map);
+
+ if (node != lowest)
+ goto next;
+
+ mlog(ML_ERROR, "expected master %u died while "
+ "this node was blocked waiting on it!\n",
+ node);
+ lowest = find_next_bit(mle->maybe_map,
+ O2NM_MAX_NODES,
+ lowest+1);
+ if (lowest < O2NM_MAX_NODES) {
+ mlog(0, "still blocked. waiting "
+ "on %u now\n", lowest);
+ goto next;
+ }
+
+ /* mle is an MLE_BLOCK, but there is now
+ * nothing left to block on. we need to return
+ * all the way back out and try again with
+ * an MLE_MASTER. dlm_do_local_recovery_cleanup
+ * has already run, so the mle refcount is ok */
+ mlog(0, "no longer blocking. we can "
+ "try to master this here\n");
+ mle->type = DLM_MLE_MASTER;
+ memset(mle->maybe_map, 0,
+ sizeof(mle->maybe_map));
+ memset(mle->response_map, 0,
+ sizeof(mle->maybe_map));
+ memcpy(mle->vote_map, mle->node_map,
+ sizeof(mle->node_map));
+ mle->u.res = res;
+ set_bit(dlm->node_num, mle->maybe_map);
+
+ ret = -EAGAIN;
+ goto next;
+ }
+
+ clear_bit(node, mle->maybe_map);
+ if (node > dlm->node_num)
+ goto next;
+
+ mlog(0, "dead node in map!\n");
+ /* yuck. go back and re-contact all nodes
+ * in the vote_map, removing this node. */
+ memset(mle->response_map, 0,
+ sizeof(mle->response_map));
+ }
+ ret = -EAGAIN;
+next:
+ node = dlm_bitmap_diff_iter_next(&bdi, &sc);
+ }
+ return ret;
+}
+
+
+/*
+ * DLM_MASTER_REQUEST_MSG
+ *
+ * returns: 0 on success,
+ * -errno on a network error
+ *
+ * on error, the caller should assume the target node is "dead"
+ *
+ */
+
+static int dlm_do_master_request(struct dlm_master_list_entry *mle, int to)
+{
+ struct dlm_ctxt *dlm = mle->dlm;
+ struct dlm_master_request request;
+ int ret, response=0, resend;
+
+ memset(&request, 0, sizeof(request));
+ request.node_idx = dlm->node_num;
+
+ BUG_ON(mle->type == DLM_MLE_MIGRATION);
+
+ if (mle->type != DLM_MLE_MASTER) {
+ request.namelen = mle->u.name.len;
+ memcpy(request.name, mle->u.name.name, request.namelen);
+ } else {
+ request.namelen = mle->u.res->lockname.len;
+ memcpy(request.name, mle->u.res->lockname.name,
+ request.namelen);
+ }
+
+again:
+ ret = o2net_send_message(DLM_MASTER_REQUEST_MSG, dlm->key, &request,
+ sizeof(request), to, &response);
+ if (ret < 0) {
+ if (ret == -ESRCH) {
+ /* should never happen */
+ mlog(ML_ERROR, "TCP stack not ready!\n");
+ BUG();
+ } else if (ret == -EINVAL) {
+ mlog(ML_ERROR, "bad args passed to o2net!\n");
+ BUG();
+ } else if (ret == -ENOMEM) {
+ mlog(ML_ERROR, "out of memory while trying to send "
+ "network message! retrying\n");
+ /* this is totally crude */
+ msleep(50);
+ goto again;
+ } else if (!dlm_is_host_down(ret)) {
+ /* not a network error. bad. */
+ mlog_errno(ret);
+ mlog(ML_ERROR, "unhandled error!");
+ BUG();
+ }
+ /* all other errors should be network errors,
+ * and likely indicate node death */
+ mlog(ML_ERROR, "link to %d went down!\n", to);
+ goto out;
+ }
+
+ ret = 0;
+ resend = 0;
+ spin_lock(&mle->spinlock);
+ switch (response) {
+ case DLM_MASTER_RESP_YES:
+ set_bit(to, mle->response_map);
+ mlog(0, "node %u is the master, response=YES\n", to);
+ mle->master = to;
+ break;
+ case DLM_MASTER_RESP_NO:
+ mlog(0, "node %u not master, response=NO\n", to);
+ set_bit(to, mle->response_map);
+ break;
+ case DLM_MASTER_RESP_MAYBE:
+ mlog(0, "node %u not master, response=MAYBE\n", to);
+ set_bit(to, mle->response_map);
+ set_bit(to, mle->maybe_map);
+ break;
+ case DLM_MASTER_RESP_ERROR:
+ mlog(0, "node %u hit an error, resending\n", to);
+ resend = 1;
+ response = 0;
+ break;
+ default:
+ mlog(ML_ERROR, "bad response! %u\n", response);
+ BUG();
+ }
+ spin_unlock(&mle->spinlock);
+ if (resend) {
+ /* this is also totally crude */
+ msleep(50);
+ goto again;
+ }
+
+out:
+ return ret;
+}
+
+/*
+ * locks that can be taken here:
+ * dlm->spinlock
+ * res->spinlock
+ * mle->spinlock
+ * dlm->master_list
+ *
+ * if possible, TRIM THIS DOWN!!!
+ */
+int dlm_master_request_handler(struct o2net_msg *msg, u32 len, void *data)
+{
+ u8 response = DLM_MASTER_RESP_MAYBE;
+ struct dlm_ctxt *dlm = data;
+ struct dlm_lock_resource *res;
+ struct dlm_master_request *request = (struct dlm_master_request *) msg->buf;
+ struct dlm_master_list_entry *mle = NULL, *tmpmle = NULL;
+ char *name;
+ unsigned int namelen;
+ int found, ret;
+ int set_maybe;
+
+ if (!dlm_grab(dlm))
+ return DLM_MASTER_RESP_NO;
+
+ if (!dlm_domain_fully_joined(dlm)) {
+ response = DLM_MASTER_RESP_NO;
+ goto send_response;
+ }
+
+ name = request->name;
+ namelen = request->namelen;
+
+ if (namelen > DLM_LOCKID_NAME_MAX) {
+ response = DLM_IVBUFLEN;
+ goto send_response;
+ }
+
+way_up_top:
+ spin_lock(&dlm->spinlock);
+ res = __dlm_lookup_lockres(dlm, name, namelen);
+ if (res) {
+ spin_unlock(&dlm->spinlock);
+
+ /* take care of the easy cases up front */
+ spin_lock(&res->spinlock);
+ if (res->state & DLM_LOCK_RES_RECOVERING) {
+ spin_unlock(&res->spinlock);
+ mlog(0, "returning DLM_MASTER_RESP_ERROR since res is "
+ "being recovered\n");
+ response = DLM_MASTER_RESP_ERROR;
+ if (mle)
+ kmem_cache_free(dlm_mle_cache, mle);
+ goto send_response;
+ }
+
+ if (res->owner == dlm->node_num) {
+ u32 flags = DLM_ASSERT_MASTER_MLE_CLEANUP;
+ spin_unlock(&res->spinlock);
+ // mlog(0, "this node is the master\n");
+ response = DLM_MASTER_RESP_YES;
+ if (mle)
+ kmem_cache_free(dlm_mle_cache, mle);
+
+ /* this node is the owner.
+ * there is some extra work that needs to
+ * happen now. the requesting node has
+ * caused all nodes up to this one to
+ * create mles. this node now needs to
+ * go back and clean those up. */
+ mlog(0, "%u is the owner of %.*s, cleaning everyone else\n",
+ dlm->node_num, res->lockname.len, res->lockname.name);
+ ret = dlm_dispatch_assert_master(dlm, res, 1,
+ request->node_idx,
+ flags);
+ if (ret < 0) {
+ mlog(ML_ERROR, "failed to dispatch assert "
+ "master work\n");
+ response = DLM_MASTER_RESP_ERROR;
+ }
+ goto send_response;
+ } else if (res->owner != DLM_LOCK_RES_OWNER_UNKNOWN) {
+ spin_unlock(&res->spinlock);
+ // mlog(0, "node %u is the master\n", res->owner);
+ response = DLM_MASTER_RESP_NO;
+ if (mle)
+ kmem_cache_free(dlm_mle_cache, mle);
+ goto send_response;
+ }
+
+ /* ok, there is no owner. either this node is
+ * being blocked, or it is actively trying to
+ * master this lock. */
+ if (!(res->state & DLM_LOCK_RES_IN_PROGRESS)) {
+ mlog(ML_ERROR, "lock with no owner should be "
+ "in-progress!\n");
+ BUG();
+ }
+
+ // mlog(0, "lockres is in progress...\n");
+ spin_lock(&dlm->master_lock);
+ found = dlm_find_mle(dlm, &tmpmle, name, namelen);
+ if (!found) {
+ mlog(ML_ERROR, "no mle found for this lock!\n");
+ BUG();
+ }
+ set_maybe = 1;
+ spin_lock(&tmpmle->spinlock);
+ if (tmpmle->type == DLM_MLE_BLOCK) {
+ // mlog(0, "this node is waiting for "
+ // "lockres to be mastered\n");
+ response = DLM_MASTER_RESP_NO;
+ } else if (tmpmle->type == DLM_MLE_MIGRATION) {
+ mlog(0, "node %u is master, but trying to migrate to "
+ "node %u.\n", tmpmle->master, tmpmle->new_master);
+ if (tmpmle->master == dlm->node_num) {
+ response = DLM_MASTER_RESP_YES;
+ mlog(ML_ERROR, "no owner on lockres, but this "
+ "node is trying to migrate it to %u?!\n",
+ tmpmle->new_master);
+ BUG();
+ } else {
+ /* the real master can respond on its own */
+ response = DLM_MASTER_RESP_NO;
+ }
+ } else if (tmpmle->master != DLM_LOCK_RES_OWNER_UNKNOWN) {
+ set_maybe = 0;
+ if (tmpmle->master == dlm->node_num)
+ response = DLM_MASTER_RESP_YES;
+ else
+ response = DLM_MASTER_RESP_NO;
+ } else {
+ // mlog(0, "this node is attempting to "
+ // "master lockres\n");
+ response = DLM_MASTER_RESP_MAYBE;
+ }
+ if (set_maybe)
+ set_bit(request->node_idx, tmpmle->maybe_map);
+ spin_unlock(&tmpmle->spinlock);
+
+ spin_unlock(&dlm->master_lock);
+ spin_unlock(&res->spinlock);
+
+ /* keep the mle attached to heartbeat events */
+ dlm_put_mle(tmpmle);
+ if (mle)
+ kmem_cache_free(dlm_mle_cache, mle);
+ goto send_response;
+ }
+
+ /*
+ * lockres doesn't exist on this node
+ * if there is an MLE_BLOCK, return NO
+ * if there is an MLE_MASTER, return MAYBE
+ * otherwise, add an MLE_BLOCK, return NO
+ */
+ spin_lock(&dlm->master_lock);
+ found = dlm_find_mle(dlm, &tmpmle, name, namelen);
+ if (!found) {
+ /* this lockid has never been seen on this node yet */
+ // mlog(0, "no mle found\n");
+ if (!mle) {
+ spin_unlock(&dlm->master_lock);
+ spin_unlock(&dlm->spinlock);
+
+ mle = (struct dlm_master_list_entry *)
+ kmem_cache_alloc(dlm_mle_cache, GFP_KERNEL);
+ if (!mle) {
+ // bad bad bad... this sucks.
+ response = DLM_MASTER_RESP_ERROR;
+ goto send_response;
+ }
+ spin_lock(&dlm->spinlock);
+ dlm_init_mle(mle, DLM_MLE_BLOCK, dlm, NULL,
+ name, namelen);
+ spin_unlock(&dlm->spinlock);
+ goto way_up_top;
+ }
+
+ // mlog(0, "this is second time thru, already allocated, "
+ // "add the block.\n");
+ set_bit(request->node_idx, mle->maybe_map);
+ list_add(&mle->list, &dlm->master_list);
+ response = DLM_MASTER_RESP_NO;
+ } else {
+ // mlog(0, "mle was found\n");
+ set_maybe = 1;
+ spin_lock(&tmpmle->spinlock);
+ if (tmpmle->type == DLM_MLE_BLOCK)
+ response = DLM_MASTER_RESP_NO;
+ else if (tmpmle->type == DLM_MLE_MIGRATION) {
+ mlog(0, "migration mle was found (%u->%u)\n",
+ tmpmle->master, tmpmle->new_master);
+ if (tmpmle->master == dlm->node_num) {
+ mlog(ML_ERROR, "no lockres, but migration mle "
+ "says that this node is master!\n");
+ BUG();
+ }
+ /* real master can respond on its own */
+ response = DLM_MASTER_RESP_NO;
+ } else {
+ if (tmpmle->master == dlm->node_num) {
+ response = DLM_MASTER_RESP_YES;
+ set_maybe = 0;
+ } else
+ response = DLM_MASTER_RESP_MAYBE;
+ }
+ if (set_maybe)
+ set_bit(request->node_idx, tmpmle->maybe_map);
+ spin_unlock(&tmpmle->spinlock);
+ }
+ spin_unlock(&dlm->master_lock);
+ spin_unlock(&dlm->spinlock);
+
+ if (found) {
+ /* keep the mle attached to heartbeat events */
+ dlm_put_mle(tmpmle);
+ }
+send_response:
+ dlm_put(dlm);
+ return response;
+}
+
+/*
+ * DLM_ASSERT_MASTER_MSG
+ */
+
+
+/*
+ * NOTE: this can be used for debugging
+ * can periodically run all locks owned by this node
+ * and re-assert across the cluster...
+ */
+static int dlm_do_assert_master(struct dlm_ctxt *dlm, const char *lockname,
+ unsigned int namelen, void *nodemap,
+ u32 flags)
+{
+ struct dlm_assert_master assert;
+ int to, tmpret;
+ struct dlm_node_iter iter;
+ int ret = 0;
+
+ BUG_ON(namelen > O2NM_MAX_NAME_LEN);
+
+ /* note that if this nodemap is empty, it returns 0 */
+ dlm_node_iter_init(nodemap, &iter);
+ while ((to = dlm_node_iter_next(&iter)) >= 0) {
+ int r = 0;
+ mlog(0, "sending assert master to %d (%.*s)\n", to,
+ namelen, lockname);
+ memset(&assert, 0, sizeof(assert));
+ assert.node_idx = dlm->node_num;
+ assert.namelen = namelen;
+ memcpy(assert.name, lockname, namelen);
+ assert.flags = cpu_to_be32(flags);
+
+ tmpret = o2net_send_message(DLM_ASSERT_MASTER_MSG, dlm->key,
+ &assert, sizeof(assert), to, &r);
+ if (tmpret < 0) {
+ mlog(ML_ERROR, "assert_master returned %d!\n", tmpret);
+ if (!dlm_is_host_down(tmpret)) {
+ mlog(ML_ERROR, "unhandled error!\n");
+ BUG();
+ }
+ /* a node died. finish out the rest of the nodes. */
+ mlog(ML_ERROR, "link to %d went down!\n", to);
+ /* any nonzero status return will do */
+ ret = tmpret;
+ } else if (r < 0) {
+ /* ok, something horribly messed. kill thyself. */
+ mlog(ML_ERROR,"during assert master of %.*s to %u, "
+ "got %d.\n", namelen, lockname, to, r);
+ dlm_dump_lock_resources(dlm);
+ BUG();
+ }
+ }
+
+ return ret;
+}
+
+/*
+ * locks that can be taken here:
+ * dlm->spinlock
+ * res->spinlock
+ * mle->spinlock
+ * dlm->master_list
+ *
+ * if possible, TRIM THIS DOWN!!!
+ */
+int dlm_assert_master_handler(struct o2net_msg *msg, u32 len, void *data)
+{
+ struct dlm_ctxt *dlm = data;
+ struct dlm_master_list_entry *mle = NULL;
+ struct dlm_assert_master *assert = (struct dlm_assert_master *)msg->buf;
+ struct dlm_lock_resource *res = NULL;
+ char *name;
+ unsigned int namelen;
+ u32 flags;
+
+ if (!dlm_grab(dlm))
+ return 0;
+
+ name = assert->name;
+ namelen = assert->namelen;
+ flags = be32_to_cpu(assert->flags);
+
+ if (namelen > DLM_LOCKID_NAME_MAX) {
+ mlog(ML_ERROR, "Invalid name length!");
+ goto done;
+ }
+
+ spin_lock(&dlm->spinlock);
+
+ if (flags)
+ mlog(0, "assert_master with flags: %u\n", flags);
+
+ /* find the MLE */
+ spin_lock(&dlm->master_lock);
+ if (!dlm_find_mle(dlm, &mle, name, namelen)) {
+ /* not an error, could be master just re-asserting */
+ mlog(0, "just got an assert_master from %u, but no "
+ "MLE for it! (%.*s)\n", assert->node_idx,
+ namelen, name);
+ } else {
+ int bit = find_next_bit (mle->maybe_map, O2NM_MAX_NODES, 0);
+ if (bit >= O2NM_MAX_NODES) {
+ /* not necessarily an error, though less likely.
+ * could be master just re-asserting. */
+ mlog(ML_ERROR, "no bits set in the maybe_map, but %u "
+ "is asserting! (%.*s)\n", assert->node_idx,
+ namelen, name);
+ } else if (bit != assert->node_idx) {
+ if (flags & DLM_ASSERT_MASTER_MLE_CLEANUP) {
+ mlog(0, "master %u was found, %u should "
+ "back off\n", assert->node_idx, bit);
+ } else {
+ /* with the fix for bug 569, a higher node
+ * number winning the mastery will respond
+ * YES to mastery requests, but this node
+ * had no way of knowing. let it pass. */
+ mlog(ML_ERROR, "%u is the lowest node, "
+ "%u is asserting. (%.*s) %u must "
+ "have begun after %u won.\n", bit,
+ assert->node_idx, namelen, name, bit,
+ assert->node_idx);
+ }
+ }
+ }
+ spin_unlock(&dlm->master_lock);
+
+ /* ok everything checks out with the MLE
+ * now check to see if there is a lockres */
+ res = __dlm_lookup_lockres(dlm, name, namelen);
+ if (res) {
+ spin_lock(&res->spinlock);
+ if (res->state & DLM_LOCK_RES_RECOVERING) {
+ mlog(ML_ERROR, "%u asserting but %.*s is "
+ "RECOVERING!\n", assert->node_idx, namelen, name);
+ goto kill;
+ }
+ if (!mle) {
+ if (res->owner != assert->node_idx) {
+ mlog(ML_ERROR, "assert_master from "
+ "%u, but current owner is "
+ "%u! (%.*s)\n",
+ assert->node_idx, res->owner,
+ namelen, name);
+ goto kill;
+ }
+ } else if (mle->type != DLM_MLE_MIGRATION) {
+ if (res->owner != DLM_LOCK_RES_OWNER_UNKNOWN) {
+ /* owner is just re-asserting */
+ if (res->owner == assert->node_idx) {
+ mlog(0, "owner %u re-asserting on "
+ "lock %.*s\n", assert->node_idx,
+ namelen, name);
+ goto ok;
+ }
+ mlog(ML_ERROR, "got assert_master from "
+ "node %u, but %u is the owner! "
+ "(%.*s)\n", assert->node_idx,
+ res->owner, namelen, name);
+ goto kill;
+ }
+ if (!(res->state & DLM_LOCK_RES_IN_PROGRESS)) {
+ mlog(ML_ERROR, "got assert from %u, but lock "
+ "with no owner should be "
+ "in-progress! (%.*s)\n",
+ assert->node_idx,
+ namelen, name);
+ goto kill;
+ }
+ } else /* mle->type == DLM_MLE_MIGRATION */ {
+ /* should only be getting an assert from new master */
+ if (assert->node_idx != mle->new_master) {
+ mlog(ML_ERROR, "got assert from %u, but "
+ "new master is %u, and old master "
+ "was %u (%.*s)\n",
+ assert->node_idx, mle->new_master,
+ mle->master, namelen, name);
+ goto kill;
+ }
+
+ }
+ok:
+ spin_unlock(&res->spinlock);
+ }
+ spin_unlock(&dlm->spinlock);
+
+ // mlog(0, "woo! got an assert_master from node %u!\n",
+ // assert->node_idx);
+ if (mle) {
+ int extra_ref;
+
+ spin_lock(&mle->spinlock);
+ extra_ref = !!(mle->type == DLM_MLE_BLOCK
+ || mle->type == DLM_MLE_MIGRATION);
+ mle->master = assert->node_idx;
+ atomic_set(&mle->woken, 1);
+ wake_up(&mle->wq);
+ spin_unlock(&mle->spinlock);
+
+ if (mle->type == DLM_MLE_MIGRATION && res) {
+ mlog(0, "finishing off migration of lockres %.*s, "
+ "from %u to %u\n",
+ res->lockname.len, res->lockname.name,
+ dlm->node_num, mle->new_master);
+ spin_lock(&res->spinlock);
+ res->state &= ~DLM_LOCK_RES_MIGRATING;
+ dlm_change_lockres_owner(dlm, res, mle->new_master);
+ BUG_ON(res->state & DLM_LOCK_RES_DIRTY);
+ spin_unlock(&res->spinlock);
+ }
+ /* master is known, detach if not already detached */
+ dlm_mle_detach_hb_events(dlm, mle);
+ dlm_put_mle(mle);
+
+ if (extra_ref) {
+ /* the assert master message now balances the extra
+ * ref given by the master / migration request message.
+ * if this is the last put, it will be removed
+ * from the list. */
+ dlm_put_mle(mle);
+ }
+ }
+
+done:
+ if (res)
+ dlm_lockres_put(res);
+ dlm_put(dlm);
+ return 0;
+
+kill:
+ /* kill the caller! */
+ spin_unlock(&res->spinlock);
+ spin_unlock(&dlm->spinlock);
+ dlm_lockres_put(res);
+ mlog(ML_ERROR, "Bad message received from another node. Dumping state "
+ "and killing the other node now! This node is OK and can continue.\n");
+ dlm_dump_lock_resources(dlm);
+ dlm_put(dlm);
+ return -EINVAL;
+}
+
+int dlm_dispatch_assert_master(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res,
+ int ignore_higher, u8 request_from, u32 flags)
+{
+ struct dlm_work_item *item;
+ item = kcalloc(1, sizeof(*item), GFP_KERNEL);
+ if (!item)
+ return -ENOMEM;
+
+
+ /* queue up work for dlm_assert_master_worker */
+ dlm_grab(dlm); /* get an extra ref for the work item */
+ dlm_init_work_item(dlm, item, dlm_assert_master_worker, NULL);
+ item->u.am.lockres = res; /* already have a ref */
+ /* can optionally ignore node numbers higher than this node */
+ item->u.am.ignore_higher = ignore_higher;
+ item->u.am.request_from = request_from;
+ item->u.am.flags = flags;
+
+ spin_lock(&dlm->work_lock);
+ list_add_tail(&item->list, &dlm->work_list);
+ spin_unlock(&dlm->work_lock);
+
+ schedule_work(&dlm->dispatched_work);
+ return 0;
+}
+
+static void dlm_assert_master_worker(struct dlm_work_item *item, void *data)
+{
+ struct dlm_ctxt *dlm = data;
+ int ret = 0;
+ struct dlm_lock_resource *res;
+ unsigned long nodemap[BITS_TO_LONGS(O2NM_MAX_NODES)];
+ int ignore_higher;
+ int bit;
+ u8 request_from;
+ u32 flags;
+
+ dlm = item->dlm;
+ res = item->u.am.lockres;
+ ignore_higher = item->u.am.ignore_higher;
+ request_from = item->u.am.request_from;
+ flags = item->u.am.flags;
+
+ spin_lock(&dlm->spinlock);
+ memcpy(nodemap, dlm->domain_map, sizeof(nodemap));
+ spin_unlock(&dlm->spinlock);
+
+ clear_bit(dlm->node_num, nodemap);
+ if (ignore_higher) {
+ /* if is this just to clear up mles for nodes below
+ * this node, do not send the message to the original
+ * caller or any node number higher than this */
+ clear_bit(request_from, nodemap);
+ bit = dlm->node_num;
+ while (1) {
+ bit = find_next_bit(nodemap, O2NM_MAX_NODES,
+ bit+1);
+ if (bit >= O2NM_MAX_NODES)
+ break;
+ clear_bit(bit, nodemap);
+ }
+ }
+
+ /* this call now finishes out the nodemap
+ * even if one or more nodes die */
+ mlog(0, "worker about to master %.*s here, this=%u\n",
+ res->lockname.len, res->lockname.name, dlm->node_num);
+ ret = dlm_do_assert_master(dlm, res->lockname.name,
+ res->lockname.len,
+ nodemap, flags);
+ if (ret < 0) {
+ /* no need to restart, we are done */
+ mlog_errno(ret);
+ }
+
+ dlm_lockres_put(res);
+
+ mlog(0, "finished with dlm_assert_master_worker\n");
+}
+
+
+/*
+ * DLM_MIGRATE_LOCKRES
+ */
+
+
+int dlm_migrate_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *res,
+ u8 target)
+{
+ struct dlm_master_list_entry *mle = NULL;
+ struct dlm_master_list_entry *oldmle = NULL;
+ struct dlm_migratable_lockres *mres = NULL;
+ int ret = -EINVAL;
+ const char *name;
+ unsigned int namelen;
+ int mle_added = 0;
+ struct list_head *queue, *iter;
+ int i;
+ struct dlm_lock *lock;
+ int empty = 1;
+
+ if (!dlm_grab(dlm))
+ return -EINVAL;
+
+ name = res->lockname.name;
+ namelen = res->lockname.len;
+
+ mlog(0, "migrating %.*s to %u\n", namelen, name, target);
+
+ /*
+ * ensure this lockres is a proper candidate for migration
+ */
+ spin_lock(&res->spinlock);
+ if (res->owner == DLM_LOCK_RES_OWNER_UNKNOWN) {
+ mlog(0, "cannot migrate lockres with unknown owner!\n");
+ spin_unlock(&res->spinlock);
+ goto leave;
+ }
+ if (res->owner != dlm->node_num) {
+ mlog(0, "cannot migrate lockres this node doesn't own!\n");
+ spin_unlock(&res->spinlock);
+ goto leave;
+ }
+ mlog(0, "checking queues...\n");
+ queue = &res->granted;
+ for (i=0; i<3; i++) {
+ list_for_each(iter, queue) {
+ lock = list_entry (iter, struct dlm_lock, list);
+ empty = 0;
+ if (lock->ml.node == dlm->node_num) {
+ mlog(0, "found a lock owned by this node "
+ "still on the %s queue! will not "
+ "migrate this lockres\n",
+ i==0 ? "granted" :
+ (i==1 ? "converting" : "blocked"));
+ spin_unlock(&res->spinlock);
+ ret = -ENOTEMPTY;
+ goto leave;
+ }
+ }
+ queue++;
+ }
+ mlog(0, "all locks on this lockres are nonlocal. continuing\n");
+ spin_unlock(&res->spinlock);
+
+ /* no work to do */
+ if (empty) {
+ mlog(0, "no locks were found on this lockres! done!\n");
+ ret = 0;
+ goto leave;
+ }
+
+ /*
+ * preallocate up front
+ * if this fails, abort
+ */
+
+ ret = -ENOMEM;
+ mres = (struct dlm_migratable_lockres *) __get_free_page(GFP_KERNEL);
+ if (!mres) {
+ mlog_errno(ret);
+ goto leave;
+ }
+
+ mle = (struct dlm_master_list_entry *) kmem_cache_alloc(dlm_mle_cache,
+ GFP_KERNEL);
+ if (!mle) {
+ mlog_errno(ret);
+ goto leave;
+ }
+ ret = 0;
+
+ /*
+ * find a node to migrate the lockres to
+ */
+
+ mlog(0, "picking a migration node\n");
+ spin_lock(&dlm->spinlock);
+ /* pick a new node */
+ if (!test_bit(target, dlm->domain_map) ||
+ target >= O2NM_MAX_NODES) {
+ target = dlm_pick_migration_target(dlm, res);
+ }
+ mlog(0, "node %u chosen for migration\n", target);
+
+ if (target >= O2NM_MAX_NODES ||
+ !test_bit(target, dlm->domain_map)) {
+ /* target chosen is not alive */
+ ret = -EINVAL;
+ }
+
+ if (ret) {
+ spin_unlock(&dlm->spinlock);
+ goto fail;
+ }
+
+ mlog(0, "continuing with target = %u\n", target);
+
+ /*
+ * clear any existing master requests and
+ * add the migration mle to the list
+ */
+ spin_lock(&dlm->master_lock);
+ ret = dlm_add_migration_mle(dlm, res, mle, &oldmle, name,
+ namelen, target, dlm->node_num);
+ spin_unlock(&dlm->master_lock);
+ spin_unlock(&dlm->spinlock);
+
+ if (ret == -EEXIST) {
+ mlog(0, "another process is already migrating it\n");
+ goto fail;
+ }
+ mle_added = 1;
+
+ /*
+ * set the MIGRATING flag and flush asts
+ * if we fail after this we need to re-dirty the lockres
+ */
+ if (dlm_mark_lockres_migrating(dlm, res, target) < 0) {
+ mlog(ML_ERROR, "tried to migrate %.*s to %u, but "
+ "the target went down.\n", res->lockname.len,
+ res->lockname.name, target);
+ spin_lock(&res->spinlock);
+ res->state &= ~DLM_LOCK_RES_MIGRATING;
+ spin_unlock(&res->spinlock);
+ ret = -EINVAL;
+ }
+
+fail:
+ if (oldmle) {
+ /* master is known, detach if not already detached */
+ dlm_mle_detach_hb_events(dlm, oldmle);
+ dlm_put_mle(oldmle);
+ }
+
+ if (ret < 0) {
+ if (mle_added) {
+ dlm_mle_detach_hb_events(dlm, mle);
+ dlm_put_mle(mle);
+ } else if (mle) {
+ kmem_cache_free(dlm_mle_cache, mle);
+ }
+ goto leave;
+ }
+
+ /*
+ * at this point, we have a migration target, an mle
+ * in the master list, and the MIGRATING flag set on
+ * the lockres
+ */
+
+
+ /* get an extra reference on the mle.
+ * otherwise the assert_master from the new
+ * master will destroy this.
+ * also, make sure that all callers of dlm_get_mle
+ * take both dlm->spinlock and dlm->master_lock */
+ spin_lock(&dlm->spinlock);
+ spin_lock(&dlm->master_lock);
+ dlm_get_mle(mle);
+ spin_unlock(&dlm->master_lock);
+ spin_unlock(&dlm->spinlock);
+
+ /* notify new node and send all lock state */
+ /* call send_one_lockres with migration flag.
+ * this serves as notice to the target node that a
+ * migration is starting. */
+ ret = dlm_send_one_lockres(dlm, res, mres, target,
+ DLM_MRES_MIGRATION);
+
+ if (ret < 0) {
+ mlog(0, "migration to node %u failed with %d\n",
+ target, ret);
+ /* migration failed, detach and clean up mle */
+ dlm_mle_detach_hb_events(dlm, mle);
+ dlm_put_mle(mle);
+ dlm_put_mle(mle);
+ goto leave;
+ }
+
+ /* at this point, the target sends a message to all nodes,
+ * (using dlm_do_migrate_request). this node is skipped since
+ * we had to put an mle in the list to begin the process. this
+ * node now waits for target to do an assert master. this node
+ * will be the last one notified, ensuring that the migration
+ * is complete everywhere. if the target dies while this is
+ * going on, some nodes could potentially see the target as the
+ * master, so it is important that my recovery finds the migration
+ * mle and sets the master to UNKNONWN. */
+
+
+ /* wait for new node to assert master */
+ while (1) {
+ ret = wait_event_interruptible_timeout(mle->wq,
+ (atomic_read(&mle->woken) == 1),
+ msecs_to_jiffies(5000));
+
+ if (ret >= 0) {
+ if (atomic_read(&mle->woken) == 1 ||
+ res->owner == target)
+ break;
+
+ mlog(0, "timed out during migration\n");
+ }
+ if (ret == -ERESTARTSYS) {
+ /* migration failed, detach and clean up mle */
+ dlm_mle_detach_hb_events(dlm, mle);
+ dlm_put_mle(mle);
+ dlm_put_mle(mle);
+ goto leave;
+ }
+ /* TODO: if node died: stop, clean up, return error */
+ }
+
+ /* all done, set the owner, clear the flag */
+ spin_lock(&res->spinlock);
+ dlm_set_lockres_owner(dlm, res, target);
+ res->state &= ~DLM_LOCK_RES_MIGRATING;
+ dlm_remove_nonlocal_locks(dlm, res);
+ spin_unlock(&res->spinlock);
+ wake_up(&res->wq);
+
+ /* master is known, detach if not already detached */
+ dlm_mle_detach_hb_events(dlm, mle);
+ dlm_put_mle(mle);
+ ret = 0;
+
+ dlm_lockres_calc_usage(dlm, res);
+
+leave:
+ /* re-dirty the lockres if we failed */
+ if (ret < 0)
+ dlm_kick_thread(dlm, res);
+
+ /* TODO: cleanup */
+ if (mres)
+ free_page((unsigned long)mres);
+
+ dlm_put(dlm);
+
+ mlog(0, "returning %d\n", ret);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(dlm_migrate_lockres);
+
+int dlm_lock_basts_flushed(struct dlm_ctxt *dlm, struct dlm_lock *lock)
+{
+ int ret;
+ spin_lock(&dlm->ast_lock);
+ spin_lock(&lock->spinlock);
+ ret = (list_empty(&lock->bast_list) && !lock->bast_pending);
+ spin_unlock(&lock->spinlock);
+ spin_unlock(&dlm->ast_lock);
+ return ret;
+}
+
+static int dlm_migration_can_proceed(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res,
+ u8 mig_target)
+{
+ int can_proceed;
+ spin_lock(&res->spinlock);
+ can_proceed = !!(res->state & DLM_LOCK_RES_MIGRATING);
+ spin_unlock(&res->spinlock);
+
+ /* target has died, so make the caller break out of the
+ * wait_event, but caller must recheck the domain_map */
+ spin_lock(&dlm->spinlock);
+ if (!test_bit(mig_target, dlm->domain_map))
+ can_proceed = 1;
+ spin_unlock(&dlm->spinlock);
+ return can_proceed;
+}
+
+int dlm_lockres_is_dirty(struct dlm_ctxt *dlm, struct dlm_lock_resource *res)
+{
+ int ret;
+ spin_lock(&res->spinlock);
+ ret = !!(res->state & DLM_LOCK_RES_DIRTY);
+ spin_unlock(&res->spinlock);
+ return ret;
+}
+
+
+static int dlm_mark_lockres_migrating(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res,
+ u8 target)
+{
+ int ret = 0;
+
+ mlog(0, "dlm_mark_lockres_migrating: %.*s, from %u to %u\n",
+ res->lockname.len, res->lockname.name, dlm->node_num,
+ target);
+ /* need to set MIGRATING flag on lockres. this is done by
+ * ensuring that all asts have been flushed for this lockres. */
+ spin_lock(&res->spinlock);
+ BUG_ON(res->migration_pending);
+ res->migration_pending = 1;
+ /* strategy is to reserve an extra ast then release
+ * it below, letting the release do all of the work */
+ __dlm_lockres_reserve_ast(res);
+ spin_unlock(&res->spinlock);
+
+ /* now flush all the pending asts.. hang out for a bit */
+ dlm_kick_thread(dlm, res);
+ wait_event(dlm->ast_wq, !dlm_lockres_is_dirty(dlm, res));
+ dlm_lockres_release_ast(dlm, res);
+
+ mlog(0, "about to wait on migration_wq, dirty=%s\n",
+ res->state & DLM_LOCK_RES_DIRTY ? "yes" : "no");
+ /* if the extra ref we just put was the final one, this
+ * will pass thru immediately. otherwise, we need to wait
+ * for the last ast to finish. */
+again:
+ ret = wait_event_interruptible_timeout(dlm->migration_wq,
+ dlm_migration_can_proceed(dlm, res, target),
+ msecs_to_jiffies(1000));
+ if (ret < 0) {
+ mlog(0, "woken again: migrating? %s, dead? %s\n",
+ res->state & DLM_LOCK_RES_MIGRATING ? "yes":"no",
+ test_bit(target, dlm->domain_map) ? "no":"yes");
+ } else {
+ mlog(0, "all is well: migrating? %s, dead? %s\n",
+ res->state & DLM_LOCK_RES_MIGRATING ? "yes":"no",
+ test_bit(target, dlm->domain_map) ? "no":"yes");
+ }
+ if (!dlm_migration_can_proceed(dlm, res, target)) {
+ mlog(0, "trying again...\n");
+ goto again;
+ }
+
+ /* did the target go down or die? */
+ spin_lock(&dlm->spinlock);
+ if (!test_bit(target, dlm->domain_map)) {
+ mlog(ML_ERROR, "aha. migration target %u just went down\n",
+ target);
+ ret = -EHOSTDOWN;
+ }
+ spin_unlock(&dlm->spinlock);
+
+ /*
+ * at this point:
+ *
+ * o the DLM_LOCK_RES_MIGRATING flag is set
+ * o there are no pending asts on this lockres
+ * o all processes trying to reserve an ast on this
+ * lockres must wait for the MIGRATING flag to clear
+ */
+ return ret;
+}
+
+/* last step in the migration process.
+ * original master calls this to free all of the dlm_lock
+ * structures that used to be for other nodes. */
+static void dlm_remove_nonlocal_locks(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res)
+{
+ struct list_head *iter, *iter2;
+ struct list_head *queue = &res->granted;
+ int i;
+ struct dlm_lock *lock;
+
+ assert_spin_locked(&res->spinlock);
+
+ BUG_ON(res->owner == dlm->node_num);
+
+ for (i=0; i<3; i++) {
+ list_for_each_safe(iter, iter2, queue) {
+ lock = list_entry (iter, struct dlm_lock, list);
+ if (lock->ml.node != dlm->node_num) {
+ mlog(0, "putting lock for node %u\n",
+ lock->ml.node);
+ /* be extra careful */
+ BUG_ON(!list_empty(&lock->ast_list));
+ BUG_ON(!list_empty(&lock->bast_list));
+ BUG_ON(lock->ast_pending);
+ BUG_ON(lock->bast_pending);
+ list_del_init(&lock->list);
+ dlm_lock_put(lock);
+ }
+ }
+ queue++;
+ }
+}
+
+/* for now this is not too intelligent. we will
+ * need stats to make this do the right thing.
+ * this just finds the first lock on one of the
+ * queues and uses that node as the target. */
+static u8 dlm_pick_migration_target(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res)
+{
+ int i;
+ struct list_head *queue = &res->granted;
+ struct list_head *iter;
+ struct dlm_lock *lock;
+ int nodenum;
+
+ assert_spin_locked(&dlm->spinlock);
+
+ spin_lock(&res->spinlock);
+ for (i=0; i<3; i++) {
+ list_for_each(iter, queue) {
+ /* up to the caller to make sure this node
+ * is alive */
+ lock = list_entry (iter, struct dlm_lock, list);
+ if (lock->ml.node != dlm->node_num) {
+ spin_unlock(&res->spinlock);
+ return lock->ml.node;
+ }
+ }
+ queue++;
+ }
+ spin_unlock(&res->spinlock);
+ mlog(0, "have not found a suitable target yet! checking domain map\n");
+
+ /* ok now we're getting desperate. pick anyone alive. */
+ nodenum = -1;
+ while (1) {
+ nodenum = find_next_bit(dlm->domain_map,
+ O2NM_MAX_NODES, nodenum+1);
+ mlog(0, "found %d in domain map\n", nodenum);
+ if (nodenum >= O2NM_MAX_NODES)
+ break;
+ if (nodenum != dlm->node_num) {
+ mlog(0, "picking %d\n", nodenum);
+ return nodenum;
+ }
+ }
+
+ mlog(0, "giving up. no master to migrate to\n");
+ return DLM_LOCK_RES_OWNER_UNKNOWN;
+}
+
+
+
+/* this is called by the new master once all lockres
+ * data has been received */
+static int dlm_do_migrate_request(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res,
+ u8 master, u8 new_master,
+ struct dlm_node_iter *iter)
+{
+ struct dlm_migrate_request migrate;
+ int ret, status = 0;
+ int nodenum;
+
+ memset(&migrate, 0, sizeof(migrate));
+ migrate.namelen = res->lockname.len;
+ memcpy(migrate.name, res->lockname.name, migrate.namelen);
+ migrate.new_master = new_master;
+ migrate.master = master;
+
+ ret = 0;
+
+ /* send message to all nodes, except the master and myself */
+ while ((nodenum = dlm_node_iter_next(iter)) >= 0) {
+ if (nodenum == master ||
+ nodenum == new_master)
+ continue;
+
+ ret = o2net_send_message(DLM_MIGRATE_REQUEST_MSG, dlm->key,
+ &migrate, sizeof(migrate), nodenum,
+ &status);
+ if (ret < 0)
+ mlog_errno(ret);
+ else if (status < 0) {
+ mlog(0, "migrate request (node %u) returned %d!\n",
+ nodenum, status);
+ ret = status;
+ }
+ }
+
+ if (ret < 0)
+ mlog_errno(ret);
+
+ mlog(0, "returning ret=%d\n", ret);
+ return ret;
+}
+
+
+/* if there is an existing mle for this lockres, we now know who the master is.
+ * (the one who sent us *this* message) we can clear it up right away.
+ * since the process that put the mle on the list still has a reference to it,
+ * we can unhash it now, set the master and wake the process. as a result,
+ * we will have no mle in the list to start with. now we can add an mle for
+ * the migration and this should be the only one found for those scanning the
+ * list. */
+int dlm_migrate_request_handler(struct o2net_msg *msg, u32 len, void *data)
+{
+ struct dlm_ctxt *dlm = data;
+ struct dlm_lock_resource *res = NULL;
+ struct dlm_migrate_request *migrate = (struct dlm_migrate_request *) msg->buf;
+ struct dlm_master_list_entry *mle = NULL, *oldmle = NULL;
+ const char *name;
+ unsigned int namelen;
+ int ret = 0;
+
+ if (!dlm_grab(dlm))
+ return -EINVAL;
+
+ name = migrate->name;
+ namelen = migrate->namelen;
+
+ /* preallocate.. if this fails, abort */
+ mle = (struct dlm_master_list_entry *) kmem_cache_alloc(dlm_mle_cache,
+ GFP_KERNEL);
+
+ if (!mle) {
+ ret = -ENOMEM;
+ goto leave;
+ }
+
+ /* check for pre-existing lock */
+ spin_lock(&dlm->spinlock);
+ res = __dlm_lookup_lockres(dlm, name, namelen);
+ spin_lock(&dlm->master_lock);
+
+ if (res) {
+ spin_lock(&res->spinlock);
+ if (res->state & DLM_LOCK_RES_RECOVERING) {
+ /* if all is working ok, this can only mean that we got
+ * a migrate request from a node that we now see as
+ * dead. what can we do here? drop it to the floor? */
+ spin_unlock(&res->spinlock);
+ mlog(ML_ERROR, "Got a migrate request, but the "
+ "lockres is marked as recovering!");
+ kmem_cache_free(dlm_mle_cache, mle);
+ ret = -EINVAL; /* need a better solution */
+ goto unlock;
+ }
+ res->state |= DLM_LOCK_RES_MIGRATING;
+ spin_unlock(&res->spinlock);
+ }
+
+ /* ignore status. only nonzero status would BUG. */
+ ret = dlm_add_migration_mle(dlm, res, mle, &oldmle,
+ name, namelen,
+ migrate->new_master,
+ migrate->master);
+
+unlock:
+ spin_unlock(&dlm->master_lock);
+ spin_unlock(&dlm->spinlock);
+
+ if (oldmle) {
+ /* master is known, detach if not already detached */
+ dlm_mle_detach_hb_events(dlm, oldmle);
+ dlm_put_mle(oldmle);
+ }
+
+ if (res)
+ dlm_lockres_put(res);
+leave:
+ dlm_put(dlm);
+ return ret;
+}
+
+/* must be holding dlm->spinlock and dlm->master_lock
+ * when adding a migration mle, we can clear any other mles
+ * in the master list because we know with certainty that
+ * the master is "master". so we remove any old mle from
+ * the list after setting it's master field, and then add
+ * the new migration mle. this way we can hold with the rule
+ * of having only one mle for a given lock name at all times. */
+static int dlm_add_migration_mle(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res,
+ struct dlm_master_list_entry *mle,
+ struct dlm_master_list_entry **oldmle,
+ const char *name, unsigned int namelen,
+ u8 new_master, u8 master)
+{
+ int found;
+ int ret = 0;
+
+ *oldmle = NULL;
+
+ mlog_entry_void();
+
+ assert_spin_locked(&dlm->spinlock);
+ assert_spin_locked(&dlm->master_lock);
+
+ /* caller is responsible for any ref taken here on oldmle */
+ found = dlm_find_mle(dlm, oldmle, (char *)name, namelen);
+ if (found) {
+ struct dlm_master_list_entry *tmp = *oldmle;
+ spin_lock(&tmp->spinlock);
+ if (tmp->type == DLM_MLE_MIGRATION) {
+ if (master == dlm->node_num) {
+ /* ah another process raced me to it */
+ mlog(0, "tried to migrate %.*s, but some "
+ "process beat me to it\n",
+ namelen, name);
+ ret = -EEXIST;
+ } else {
+ /* bad. 2 NODES are trying to migrate! */
+ mlog(ML_ERROR, "migration error mle: "
+ "master=%u new_master=%u // request: "
+ "master=%u new_master=%u // "
+ "lockres=%.*s\n",
+ tmp->master, tmp->new_master,
+ master, new_master,
+ namelen, name);
+ BUG();
+ }
+ } else {
+ /* this is essentially what assert_master does */
+ tmp->master = master;
+ atomic_set(&tmp->woken, 1);
+ wake_up(&tmp->wq);
+ /* remove it from the list so that only one
+ * mle will be found */
+ list_del_init(&tmp->list);
+ }
+ spin_unlock(&tmp->spinlock);
+ }
+
+ /* now add a migration mle to the tail of the list */
+ dlm_init_mle(mle, DLM_MLE_MIGRATION, dlm, res, name, namelen);
+ mle->new_master = new_master;
+ mle->master = master;
+ /* do this for consistency with other mle types */
+ set_bit(new_master, mle->maybe_map);
+ list_add(&mle->list, &dlm->master_list);
+
+ return ret;
+}
+
+
+void dlm_clean_master_list(struct dlm_ctxt *dlm, u8 dead_node)
+{
+ struct list_head *iter, *iter2;
+ struct dlm_master_list_entry *mle;
+ struct dlm_lock_resource *res;
+
+ mlog_entry("dlm=%s, dead node=%u\n", dlm->name, dead_node);
+top:
+ assert_spin_locked(&dlm->spinlock);
+
+ /* clean the master list */
+ spin_lock(&dlm->master_lock);
+ list_for_each_safe(iter, iter2, &dlm->master_list) {
+ mle = list_entry(iter, struct dlm_master_list_entry, list);
+
+ BUG_ON(mle->type != DLM_MLE_BLOCK &&
+ mle->type != DLM_MLE_MASTER &&
+ mle->type != DLM_MLE_MIGRATION);
+
+ /* MASTER mles are initiated locally. the waiting
+ * process will notice the node map change
+ * shortly. let that happen as normal. */
+ if (mle->type == DLM_MLE_MASTER)
+ continue;
+
+
+ /* BLOCK mles are initiated by other nodes.
+ * need to clean up if the dead node would have
+ * been the master. */
+ if (mle->type == DLM_MLE_BLOCK) {
+ int bit;
+
+ spin_lock(&mle->spinlock);
+ bit = find_next_bit(mle->maybe_map, O2NM_MAX_NODES, 0);
+ if (bit != dead_node) {
+ mlog(0, "mle found, but dead node %u would "
+ "not have been master\n", dead_node);
+ spin_unlock(&mle->spinlock);
+ } else {
+ /* must drop the refcount by one since the
+ * assert_master will never arrive. this
+ * may result in the mle being unlinked and
+ * freed, but there may still be a process
+ * waiting in the dlmlock path which is fine. */
+ mlog(ML_ERROR, "node %u was expected master\n",
+ dead_node);
+ atomic_set(&mle->woken, 1);
+ spin_unlock(&mle->spinlock);
+ wake_up(&mle->wq);
+ /* final put will take care of list removal */
+ __dlm_put_mle(mle);
+ }
+ continue;
+ }
+
+ /* everything else is a MIGRATION mle */
+
+ /* the rule for MIGRATION mles is that the master
+ * becomes UNKNOWN if *either* the original or
+ * the new master dies. all UNKNOWN lockreses
+ * are sent to whichever node becomes the recovery
+ * master. the new master is responsible for
+ * determining if there is still a master for
+ * this lockres, or if he needs to take over
+ * mastery. either way, this node should expect
+ * another message to resolve this. */
+ if (mle->master != dead_node &&
+ mle->new_master != dead_node)
+ continue;
+
+ /* if we have reached this point, this mle needs to
+ * be removed from the list and freed. */
+
+ /* remove from the list early. NOTE: unlinking
+ * list_head while in list_for_each_safe */
+ spin_lock(&mle->spinlock);
+ list_del_init(&mle->list);
+ atomic_set(&mle->woken, 1);
+ spin_unlock(&mle->spinlock);
+ wake_up(&mle->wq);
+
+ mlog(0, "node %u died during migration from "
+ "%u to %u!\n", dead_node,
+ mle->master, mle->new_master);
+ /* if there is a lockres associated with this
+ * mle, find it and set its owner to UNKNOWN */
+ res = __dlm_lookup_lockres(dlm, mle->u.name.name,
+ mle->u.name.len);
+ if (res) {
+ /* unfortunately if we hit this rare case, our
+ * lock ordering is messed. we need to drop
+ * the master lock so that we can take the
+ * lockres lock, meaning that we will have to
+ * restart from the head of list. */
+ spin_unlock(&dlm->master_lock);
+
+ /* move lockres onto recovery list */
+ spin_lock(&res->spinlock);
+ dlm_set_lockres_owner(dlm, res,
+ DLM_LOCK_RES_OWNER_UNKNOWN);
+ dlm_move_lockres_to_recovery_list(dlm, res);
+ spin_unlock(&res->spinlock);
+ dlm_lockres_put(res);
+
+ /* dump the mle */
+ spin_lock(&dlm->master_lock);
+ __dlm_put_mle(mle);
+ spin_unlock(&dlm->master_lock);
+
+ /* restart */
+ goto top;
+ }
+
+ /* this may be the last reference */
+ __dlm_put_mle(mle);
+ }
+ spin_unlock(&dlm->master_lock);
+}
+
+
+int dlm_finish_migration(struct dlm_ctxt *dlm, struct dlm_lock_resource *res,
+ u8 old_master)
+{
+ struct dlm_node_iter iter;
+ int ret = 0;
+
+ spin_lock(&dlm->spinlock);
+ dlm_node_iter_init(dlm->domain_map, &iter);
+ clear_bit(old_master, iter.node_map);
+ clear_bit(dlm->node_num, iter.node_map);
+ spin_unlock(&dlm->spinlock);
+
+ mlog(0, "now time to do a migrate request to other nodes\n");
+ ret = dlm_do_migrate_request(dlm, res, old_master,
+ dlm->node_num, &iter);
+ if (ret < 0) {
+ mlog_errno(ret);
+ goto leave;
+ }
+
+ mlog(0, "doing assert master of %.*s to all except the original node\n",
+ res->lockname.len, res->lockname.name);
+ /* this call now finishes out the nodemap
+ * even if one or more nodes die */
+ ret = dlm_do_assert_master(dlm, res->lockname.name,
+ res->lockname.len, iter.node_map,
+ DLM_ASSERT_MASTER_FINISH_MIGRATION);
+ if (ret < 0) {
+ /* no longer need to retry. all living nodes contacted. */
+ mlog_errno(ret);
+ ret = 0;
+ }
+
+ memset(iter.node_map, 0, sizeof(iter.node_map));
+ set_bit(old_master, iter.node_map);
+ mlog(0, "doing assert master of %.*s back to %u\n",
+ res->lockname.len, res->lockname.name, old_master);
+ ret = dlm_do_assert_master(dlm, res->lockname.name,
+ res->lockname.len, iter.node_map,
+ DLM_ASSERT_MASTER_FINISH_MIGRATION);
+ if (ret < 0) {
+ mlog(0, "assert master to original master failed "
+ "with %d.\n", ret);
+ /* the only nonzero status here would be because of
+ * a dead original node. we're done. */
+ ret = 0;
+ }
+
+ /* all done, set the owner, clear the flag */
+ spin_lock(&res->spinlock);
+ dlm_set_lockres_owner(dlm, res, dlm->node_num);
+ res->state &= ~DLM_LOCK_RES_MIGRATING;
+ spin_unlock(&res->spinlock);
+ /* re-dirty it on the new master */
+ dlm_kick_thread(dlm, res);
+ wake_up(&res->wq);
+leave:
+ return ret;
+}
+
+/*
+ * LOCKRES AST REFCOUNT
+ * this is integral to migration
+ */
+
+/* for future intent to call an ast, reserve one ahead of time.
+ * this should be called only after waiting on the lockres
+ * with dlm_wait_on_lockres, and while still holding the
+ * spinlock after the call. */
+void __dlm_lockres_reserve_ast(struct dlm_lock_resource *res)
+{
+ assert_spin_locked(&res->spinlock);
+ if (res->state & DLM_LOCK_RES_MIGRATING) {
+ __dlm_print_one_lock_resource(res);
+ }
+ BUG_ON(res->state & DLM_LOCK_RES_MIGRATING);
+
+ atomic_inc(&res->asts_reserved);
+}
+
+/*
+ * used to drop the reserved ast, either because it went unused,
+ * or because the ast/bast was actually called.
+ *
+ * also, if there is a pending migration on this lockres,
+ * and this was the last pending ast on the lockres,
+ * atomically set the MIGRATING flag before we drop the lock.
+ * this is how we ensure that migration can proceed with no
+ * asts in progress. note that it is ok if the state of the
+ * queues is such that a lock should be granted in the future
+ * or that a bast should be fired, because the new master will
+ * shuffle the lists on this lockres as soon as it is migrated.
+ */
+void dlm_lockres_release_ast(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res)
+{
+ if (!atomic_dec_and_lock(&res->asts_reserved, &res->spinlock))
+ return;
+
+ if (!res->migration_pending) {
+ spin_unlock(&res->spinlock);
+ return;
+ }
+
+ BUG_ON(res->state & DLM_LOCK_RES_MIGRATING);
+ res->migration_pending = 0;
+ res->state |= DLM_LOCK_RES_MIGRATING;
+ spin_unlock(&res->spinlock);
+ wake_up(&res->wq);
+ wake_up(&dlm->migration_wq);
+}
--- /dev/null
+/* -*- mode: c; c-basic-offset: 8; -*-
+ * vim: noexpandtab sw=8 ts=8 sts=0:
+ *
+ * dlmrecovery.c
+ *
+ * recovery stuff
+ *
+ * Copyright (C) 2004 Oracle. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ *
+ */
+
+
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/highmem.h>
+#include <linux/utsname.h>
+#include <linux/init.h>
+#include <linux/sysctl.h>
+#include <linux/random.h>
+#include <linux/blkdev.h>
+#include <linux/socket.h>
+#include <linux/inet.h>
+#include <linux/timer.h>
+#include <linux/kthread.h>
+
+
+#include "cluster/heartbeat.h"
+#include "cluster/nodemanager.h"
+#include "cluster/tcp.h"
+
+#include "dlmapi.h"
+#include "dlmcommon.h"
+#include "dlmdomain.h"
+
+#define MLOG_MASK_PREFIX (ML_DLM|ML_DLM_RECOVERY)
+#include "cluster/masklog.h"
+
+static void dlm_do_local_recovery_cleanup(struct dlm_ctxt *dlm, u8 dead_node);
+
+static int dlm_recovery_thread(void *data);
+void dlm_complete_recovery_thread(struct dlm_ctxt *dlm);
+int dlm_launch_recovery_thread(struct dlm_ctxt *dlm);
+static void dlm_kick_recovery_thread(struct dlm_ctxt *dlm);
+static int dlm_do_recovery(struct dlm_ctxt *dlm);
+
+static int dlm_pick_recovery_master(struct dlm_ctxt *dlm);
+static int dlm_remaster_locks(struct dlm_ctxt *dlm, u8 dead_node);
+static int dlm_init_recovery_area(struct dlm_ctxt *dlm, u8 dead_node);
+static int dlm_request_all_locks(struct dlm_ctxt *dlm,
+ u8 request_from, u8 dead_node);
+static void dlm_destroy_recovery_area(struct dlm_ctxt *dlm, u8 dead_node);
+
+static inline int dlm_num_locks_in_lockres(struct dlm_lock_resource *res);
+static void dlm_init_migratable_lockres(struct dlm_migratable_lockres *mres,
+ const char *lockname, int namelen,
+ int total_locks, u64 cookie,
+ u8 flags, u8 master);
+static int dlm_send_mig_lockres_msg(struct dlm_ctxt *dlm,
+ struct dlm_migratable_lockres *mres,
+ u8 send_to,
+ struct dlm_lock_resource *res,
+ int total_locks);
+static int dlm_lockres_master_requery(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res,
+ u8 *real_master);
+static int dlm_process_recovery_data(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res,
+ struct dlm_migratable_lockres *mres);
+static int dlm_do_master_requery(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res,
+ u8 nodenum, u8 *real_master);
+static int dlm_send_finalize_reco_message(struct dlm_ctxt *dlm);
+static int dlm_send_all_done_msg(struct dlm_ctxt *dlm,
+ u8 dead_node, u8 send_to);
+static int dlm_send_begin_reco_message(struct dlm_ctxt *dlm, u8 dead_node);
+static void dlm_move_reco_locks_to_list(struct dlm_ctxt *dlm,
+ struct list_head *list, u8 dead_node);
+static void dlm_finish_local_lockres_recovery(struct dlm_ctxt *dlm,
+ u8 dead_node, u8 new_master);
+static void dlm_reco_ast(void *astdata);
+static void dlm_reco_bast(void *astdata, int blocked_type);
+static void dlm_reco_unlock_ast(void *astdata, enum dlm_status st);
+static void dlm_request_all_locks_worker(struct dlm_work_item *item,
+ void *data);
+static void dlm_mig_lockres_worker(struct dlm_work_item *item, void *data);
+
+static u64 dlm_get_next_mig_cookie(void);
+
+static spinlock_t dlm_reco_state_lock = SPIN_LOCK_UNLOCKED;
+static spinlock_t dlm_mig_cookie_lock = SPIN_LOCK_UNLOCKED;
+static u64 dlm_mig_cookie = 1;
+
+static u64 dlm_get_next_mig_cookie(void)
+{
+ u64 c;
+ spin_lock(&dlm_mig_cookie_lock);
+ c = dlm_mig_cookie;
+ if (dlm_mig_cookie == (~0ULL))
+ dlm_mig_cookie = 1;
+ else
+ dlm_mig_cookie++;
+ spin_unlock(&dlm_mig_cookie_lock);
+ return c;
+}
+
+static inline void dlm_reset_recovery(struct dlm_ctxt *dlm)
+{
+ spin_lock(&dlm->spinlock);
+ clear_bit(dlm->reco.dead_node, dlm->recovery_map);
+ dlm->reco.dead_node = O2NM_INVALID_NODE_NUM;
+ dlm->reco.new_master = O2NM_INVALID_NODE_NUM;
+ spin_unlock(&dlm->spinlock);
+}
+
+/* Worker function used during recovery. */
+void dlm_dispatch_work(void *data)
+{
+ struct dlm_ctxt *dlm = (struct dlm_ctxt *)data;
+ LIST_HEAD(tmp_list);
+ struct list_head *iter, *iter2;
+ struct dlm_work_item *item;
+ dlm_workfunc_t *workfunc;
+
+ spin_lock(&dlm->work_lock);
+ list_splice_init(&dlm->work_list, &tmp_list);
+ spin_unlock(&dlm->work_lock);
+
+ list_for_each_safe(iter, iter2, &tmp_list) {
+ item = list_entry(iter, struct dlm_work_item, list);
+ workfunc = item->func;
+ list_del_init(&item->list);
+
+ /* already have ref on dlm to avoid having
+ * it disappear. just double-check. */
+ BUG_ON(item->dlm != dlm);
+
+ /* this is allowed to sleep and
+ * call network stuff */
+ workfunc(item, item->data);
+
+ dlm_put(dlm);
+ kfree(item);
+ }
+}
+
+/*
+ * RECOVERY THREAD
+ */
+
+static void dlm_kick_recovery_thread(struct dlm_ctxt *dlm)
+{
+ /* wake the recovery thread
+ * this will wake the reco thread in one of three places
+ * 1) sleeping with no recovery happening
+ * 2) sleeping with recovery mastered elsewhere
+ * 3) recovery mastered here, waiting on reco data */
+
+ wake_up(&dlm->dlm_reco_thread_wq);
+}
+
+/* Launch the recovery thread */
+int dlm_launch_recovery_thread(struct dlm_ctxt *dlm)
+{
+ mlog(0, "starting dlm recovery thread...\n");
+
+ dlm->dlm_reco_thread_task = kthread_run(dlm_recovery_thread, dlm,
+ "dlm_reco_thread");
+ if (IS_ERR(dlm->dlm_reco_thread_task)) {
+ mlog_errno(PTR_ERR(dlm->dlm_reco_thread_task));
+ dlm->dlm_reco_thread_task = NULL;
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+void dlm_complete_recovery_thread(struct dlm_ctxt *dlm)
+{
+ if (dlm->dlm_reco_thread_task) {
+ mlog(0, "waiting for dlm recovery thread to exit\n");
+ kthread_stop(dlm->dlm_reco_thread_task);
+ dlm->dlm_reco_thread_task = NULL;
+ }
+}
+
+
+
+/*
+ * this is lame, but here's how recovery works...
+ * 1) all recovery threads cluster wide will work on recovering
+ * ONE node at a time
+ * 2) negotiate who will take over all the locks for the dead node.
+ * thats right... ALL the locks.
+ * 3) once a new master is chosen, everyone scans all locks
+ * and moves aside those mastered by the dead guy
+ * 4) each of these locks should be locked until recovery is done
+ * 5) the new master collects up all of secondary lock queue info
+ * one lock at a time, forcing each node to communicate back
+ * before continuing
+ * 6) each secondary lock queue responds with the full known lock info
+ * 7) once the new master has run all its locks, it sends a ALLDONE!
+ * message to everyone
+ * 8) upon receiving this message, the secondary queue node unlocks
+ * and responds to the ALLDONE
+ * 9) once the new master gets responses from everyone, he unlocks
+ * everything and recovery for this dead node is done
+ *10) go back to 2) while there are still dead nodes
+ *
+ */
+
+
+#define DLM_RECO_THREAD_TIMEOUT_MS (5 * 1000)
+
+static int dlm_recovery_thread(void *data)
+{
+ int status;
+ struct dlm_ctxt *dlm = data;
+ unsigned long timeout = msecs_to_jiffies(DLM_RECO_THREAD_TIMEOUT_MS);
+
+ mlog(0, "dlm thread running for %s...\n", dlm->name);
+
+ while (!kthread_should_stop()) {
+ if (dlm_joined(dlm)) {
+ status = dlm_do_recovery(dlm);
+ if (status == -EAGAIN) {
+ /* do not sleep, recheck immediately. */
+ continue;
+ }
+ if (status < 0)
+ mlog_errno(status);
+ }
+
+ wait_event_interruptible_timeout(dlm->dlm_reco_thread_wq,
+ kthread_should_stop(),
+ timeout);
+ }
+
+ mlog(0, "quitting DLM recovery thread\n");
+ return 0;
+}
+
+/* callers of the top-level api calls (dlmlock/dlmunlock) should
+ * block on the dlm->reco.event when recovery is in progress.
+ * the dlm recovery thread will set this state when it begins
+ * recovering a dead node (as the new master or not) and clear
+ * the state and wake as soon as all affected lock resources have
+ * been marked with the RECOVERY flag */
+static int dlm_in_recovery(struct dlm_ctxt *dlm)
+{
+ int in_recovery;
+ spin_lock(&dlm->spinlock);
+ in_recovery = !!(dlm->reco.state & DLM_RECO_STATE_ACTIVE);
+ spin_unlock(&dlm->spinlock);
+ return in_recovery;
+}
+
+
+void dlm_wait_for_recovery(struct dlm_ctxt *dlm)
+{
+ wait_event(dlm->reco.event, !dlm_in_recovery(dlm));
+}
+
+static void dlm_begin_recovery(struct dlm_ctxt *dlm)
+{
+ spin_lock(&dlm->spinlock);
+ BUG_ON(dlm->reco.state & DLM_RECO_STATE_ACTIVE);
+ dlm->reco.state |= DLM_RECO_STATE_ACTIVE;
+ spin_unlock(&dlm->spinlock);
+}
+
+static void dlm_end_recovery(struct dlm_ctxt *dlm)
+{
+ spin_lock(&dlm->spinlock);
+ BUG_ON(!(dlm->reco.state & DLM_RECO_STATE_ACTIVE));
+ dlm->reco.state &= ~DLM_RECO_STATE_ACTIVE;
+ spin_unlock(&dlm->spinlock);
+ wake_up(&dlm->reco.event);
+}
+
+static int dlm_do_recovery(struct dlm_ctxt *dlm)
+{
+ int status = 0;
+
+ spin_lock(&dlm->spinlock);
+
+ /* check to see if the new master has died */
+ if (dlm->reco.new_master != O2NM_INVALID_NODE_NUM &&
+ test_bit(dlm->reco.new_master, dlm->recovery_map)) {
+ mlog(0, "new master %u died while recovering %u!\n",
+ dlm->reco.new_master, dlm->reco.dead_node);
+ /* unset the new_master, leave dead_node */
+ dlm->reco.new_master = O2NM_INVALID_NODE_NUM;
+ }
+
+ /* select a target to recover */
+ if (dlm->reco.dead_node == O2NM_INVALID_NODE_NUM) {
+ int bit;
+
+ bit = find_next_bit (dlm->recovery_map, O2NM_MAX_NODES+1, 0);
+ if (bit >= O2NM_MAX_NODES || bit < 0)
+ dlm->reco.dead_node = O2NM_INVALID_NODE_NUM;
+ else
+ dlm->reco.dead_node = bit;
+ } else if (!test_bit(dlm->reco.dead_node, dlm->recovery_map)) {
+ /* BUG? */
+ mlog(ML_ERROR, "dead_node %u no longer in recovery map!\n",
+ dlm->reco.dead_node);
+ dlm->reco.dead_node = O2NM_INVALID_NODE_NUM;
+ }
+
+ if (dlm->reco.dead_node == O2NM_INVALID_NODE_NUM) {
+ // mlog(0, "nothing to recover! sleeping now!\n");
+ spin_unlock(&dlm->spinlock);
+ /* return to main thread loop and sleep. */
+ return 0;
+ }
+ mlog(0, "recovery thread found node %u in the recovery map!\n",
+ dlm->reco.dead_node);
+ spin_unlock(&dlm->spinlock);
+
+ /* take write barrier */
+ /* (stops the list reshuffling thread, proxy ast handling) */
+ dlm_begin_recovery(dlm);
+
+ if (dlm->reco.new_master == dlm->node_num)
+ goto master_here;
+
+ if (dlm->reco.new_master == O2NM_INVALID_NODE_NUM) {
+ /* choose a new master */
+ if (!dlm_pick_recovery_master(dlm)) {
+ /* already notified everyone. go. */
+ dlm->reco.new_master = dlm->node_num;
+ goto master_here;
+ }
+ mlog(0, "another node will master this recovery session.\n");
+ }
+ mlog(0, "dlm=%s, new_master=%u, this node=%u, dead_node=%u\n",
+ dlm->name, dlm->reco.new_master,
+ dlm->node_num, dlm->reco.dead_node);
+
+ /* it is safe to start everything back up here
+ * because all of the dead node's lock resources
+ * have been marked as in-recovery */
+ dlm_end_recovery(dlm);
+
+ /* sleep out in main dlm_recovery_thread loop. */
+ return 0;
+
+master_here:
+ mlog(0, "mastering recovery of %s:%u here(this=%u)!\n",
+ dlm->name, dlm->reco.dead_node, dlm->node_num);
+
+ status = dlm_remaster_locks(dlm, dlm->reco.dead_node);
+ if (status < 0) {
+ mlog(ML_ERROR, "error %d remastering locks for node %u, "
+ "retrying.\n", status, dlm->reco.dead_node);
+ } else {
+ /* success! see if any other nodes need recovery */
+ dlm_reset_recovery(dlm);
+ }
+ dlm_end_recovery(dlm);
+
+ /* continue and look for another dead node */
+ return -EAGAIN;
+}
+
+static int dlm_remaster_locks(struct dlm_ctxt *dlm, u8 dead_node)
+{
+ int status = 0;
+ struct dlm_reco_node_data *ndata;
+ struct list_head *iter;
+ int all_nodes_done;
+ int destroy = 0;
+ int pass = 0;
+
+ status = dlm_init_recovery_area(dlm, dead_node);
+ if (status < 0)
+ goto leave;
+
+ /* safe to access the node data list without a lock, since this
+ * process is the only one to change the list */
+ list_for_each(iter, &dlm->reco.node_data) {
+ ndata = list_entry (iter, struct dlm_reco_node_data, list);
+ BUG_ON(ndata->state != DLM_RECO_NODE_DATA_INIT);
+ ndata->state = DLM_RECO_NODE_DATA_REQUESTING;
+
+ mlog(0, "requesting lock info from node %u\n",
+ ndata->node_num);
+
+ if (ndata->node_num == dlm->node_num) {
+ ndata->state = DLM_RECO_NODE_DATA_DONE;
+ continue;
+ }
+
+ status = dlm_request_all_locks(dlm, ndata->node_num, dead_node);
+ if (status < 0) {
+ mlog_errno(status);
+ if (dlm_is_host_down(status))
+ ndata->state = DLM_RECO_NODE_DATA_DEAD;
+ else {
+ destroy = 1;
+ goto leave;
+ }
+ }
+
+ switch (ndata->state) {
+ case DLM_RECO_NODE_DATA_INIT:
+ case DLM_RECO_NODE_DATA_FINALIZE_SENT:
+ case DLM_RECO_NODE_DATA_REQUESTED:
+ BUG();
+ break;
+ case DLM_RECO_NODE_DATA_DEAD:
+ mlog(0, "node %u died after requesting "
+ "recovery info for node %u\n",
+ ndata->node_num, dead_node);
+ // start all over
+ destroy = 1;
+ status = -EAGAIN;
+ goto leave;
+ case DLM_RECO_NODE_DATA_REQUESTING:
+ ndata->state = DLM_RECO_NODE_DATA_REQUESTED;
+ mlog(0, "now receiving recovery data from "
+ "node %u for dead node %u\n",
+ ndata->node_num, dead_node);
+ break;
+ case DLM_RECO_NODE_DATA_RECEIVING:
+ mlog(0, "already receiving recovery data from "
+ "node %u for dead node %u\n",
+ ndata->node_num, dead_node);
+ break;
+ case DLM_RECO_NODE_DATA_DONE:
+ mlog(0, "already DONE receiving recovery data "
+ "from node %u for dead node %u\n",
+ ndata->node_num, dead_node);
+ break;
+ }
+ }
+
+ mlog(0, "done requesting all lock info\n");
+
+ /* nodes should be sending reco data now
+ * just need to wait */
+
+ while (1) {
+ /* check all the nodes now to see if we are
+ * done, or if anyone died */
+ all_nodes_done = 1;
+ spin_lock(&dlm_reco_state_lock);
+ list_for_each(iter, &dlm->reco.node_data) {
+ ndata = list_entry (iter, struct dlm_reco_node_data, list);
+
+ mlog(0, "checking recovery state of node %u\n",
+ ndata->node_num);
+ switch (ndata->state) {
+ case DLM_RECO_NODE_DATA_INIT:
+ case DLM_RECO_NODE_DATA_REQUESTING:
+ mlog(ML_ERROR, "bad ndata state for "
+ "node %u: state=%d\n",
+ ndata->node_num, ndata->state);
+ BUG();
+ break;
+ case DLM_RECO_NODE_DATA_DEAD:
+ mlog(0, "node %u died after "
+ "requesting recovery info for "
+ "node %u\n", ndata->node_num,
+ dead_node);
+ spin_unlock(&dlm_reco_state_lock);
+ // start all over
+ destroy = 1;
+ status = -EAGAIN;
+ goto leave;
+ case DLM_RECO_NODE_DATA_RECEIVING:
+ case DLM_RECO_NODE_DATA_REQUESTED:
+ all_nodes_done = 0;
+ break;
+ case DLM_RECO_NODE_DATA_DONE:
+ break;
+ case DLM_RECO_NODE_DATA_FINALIZE_SENT:
+ break;
+ }
+ }
+ spin_unlock(&dlm_reco_state_lock);
+
+ mlog(0, "pass #%d, all_nodes_done?: %s\n", ++pass,
+ all_nodes_done?"yes":"no");
+ if (all_nodes_done) {
+ int ret;
+
+ /* all nodes are now in DLM_RECO_NODE_DATA_DONE state
+ * just send a finalize message to everyone and
+ * clean up */
+ mlog(0, "all nodes are done! send finalize\n");
+ ret = dlm_send_finalize_reco_message(dlm);
+ if (ret < 0)
+ mlog_errno(ret);
+
+ spin_lock(&dlm->spinlock);
+ dlm_finish_local_lockres_recovery(dlm, dead_node,
+ dlm->node_num);
+ spin_unlock(&dlm->spinlock);
+ mlog(0, "should be done with recovery!\n");
+
+ mlog(0, "finishing recovery of %s at %lu, "
+ "dead=%u, this=%u, new=%u\n", dlm->name,
+ jiffies, dlm->reco.dead_node,
+ dlm->node_num, dlm->reco.new_master);
+ destroy = 1;
+ status = ret;
+ /* rescan everything marked dirty along the way */
+ dlm_kick_thread(dlm, NULL);
+ break;
+ }
+ /* wait to be signalled, with periodic timeout
+ * to check for node death */
+ wait_event_interruptible_timeout(dlm->dlm_reco_thread_wq,
+ kthread_should_stop(),
+ msecs_to_jiffies(DLM_RECO_THREAD_TIMEOUT_MS));
+
+ }
+
+leave:
+ if (destroy)
+ dlm_destroy_recovery_area(dlm, dead_node);
+
+ mlog_exit(status);
+ return status;
+}
+
+static int dlm_init_recovery_area(struct dlm_ctxt *dlm, u8 dead_node)
+{
+ int num=0;
+ struct dlm_reco_node_data *ndata;
+
+ spin_lock(&dlm->spinlock);
+ memcpy(dlm->reco.node_map, dlm->domain_map, sizeof(dlm->domain_map));
+ /* nodes can only be removed (by dying) after dropping
+ * this lock, and death will be trapped later, so this should do */
+ spin_unlock(&dlm->spinlock);
+
+ while (1) {
+ num = find_next_bit (dlm->reco.node_map, O2NM_MAX_NODES, num);
+ if (num >= O2NM_MAX_NODES) {
+ break;
+ }
+ BUG_ON(num == dead_node);
+
+ ndata = kcalloc(1, sizeof(*ndata), GFP_KERNEL);
+ if (!ndata) {
+ dlm_destroy_recovery_area(dlm, dead_node);
+ return -ENOMEM;
+ }
+ ndata->node_num = num;
+ ndata->state = DLM_RECO_NODE_DATA_INIT;
+ spin_lock(&dlm_reco_state_lock);
+ list_add_tail(&ndata->list, &dlm->reco.node_data);
+ spin_unlock(&dlm_reco_state_lock);
+ num++;
+ }
+
+ return 0;
+}
+
+static void dlm_destroy_recovery_area(struct dlm_ctxt *dlm, u8 dead_node)
+{
+ struct list_head *iter, *iter2;
+ struct dlm_reco_node_data *ndata;
+ LIST_HEAD(tmplist);
+
+ spin_lock(&dlm_reco_state_lock);
+ list_splice_init(&dlm->reco.node_data, &tmplist);
+ spin_unlock(&dlm_reco_state_lock);
+
+ list_for_each_safe(iter, iter2, &tmplist) {
+ ndata = list_entry (iter, struct dlm_reco_node_data, list);
+ list_del_init(&ndata->list);
+ kfree(ndata);
+ }
+}
+
+static int dlm_request_all_locks(struct dlm_ctxt *dlm, u8 request_from,
+ u8 dead_node)
+{
+ struct dlm_lock_request lr;
+ enum dlm_status ret;
+
+ mlog(0, "\n");
+
+
+ mlog(0, "dlm_request_all_locks: dead node is %u, sending request "
+ "to %u\n", dead_node, request_from);
+
+ memset(&lr, 0, sizeof(lr));
+ lr.node_idx = dlm->node_num;
+ lr.dead_node = dead_node;
+
+ // send message
+ ret = DLM_NOLOCKMGR;
+ ret = o2net_send_message(DLM_LOCK_REQUEST_MSG, dlm->key,
+ &lr, sizeof(lr), request_from, NULL);
+
+ /* negative status is handled by caller */
+ if (ret < 0)
+ mlog_errno(ret);
+
+ // return from here, then
+ // sleep until all received or error
+ return ret;
+
+}
+
+int dlm_request_all_locks_handler(struct o2net_msg *msg, u32 len, void *data)
+{
+ struct dlm_ctxt *dlm = data;
+ struct dlm_lock_request *lr = (struct dlm_lock_request *)msg->buf;
+ char *buf = NULL;
+ struct dlm_work_item *item = NULL;
+
+ if (!dlm_grab(dlm))
+ return -EINVAL;
+
+ BUG_ON(lr->dead_node != dlm->reco.dead_node);
+
+ item = kcalloc(1, sizeof(*item), GFP_KERNEL);
+ if (!item) {
+ dlm_put(dlm);
+ return -ENOMEM;
+ }
+
+ /* this will get freed by dlm_request_all_locks_worker */
+ buf = (char *) __get_free_page(GFP_KERNEL);
+ if (!buf) {
+ kfree(item);
+ dlm_put(dlm);
+ return -ENOMEM;
+ }
+
+ /* queue up work for dlm_request_all_locks_worker */
+ dlm_grab(dlm); /* get an extra ref for the work item */
+ dlm_init_work_item(dlm, item, dlm_request_all_locks_worker, buf);
+ item->u.ral.reco_master = lr->node_idx;
+ item->u.ral.dead_node = lr->dead_node;
+ spin_lock(&dlm->work_lock);
+ list_add_tail(&item->list, &dlm->work_list);
+ spin_unlock(&dlm->work_lock);
+ schedule_work(&dlm->dispatched_work);
+
+ dlm_put(dlm);
+ return 0;
+}
+
+static void dlm_request_all_locks_worker(struct dlm_work_item *item, void *data)
+{
+ struct dlm_migratable_lockres *mres;
+ struct dlm_lock_resource *res;
+ struct dlm_ctxt *dlm;
+ LIST_HEAD(resources);
+ struct list_head *iter;
+ int ret;
+ u8 dead_node, reco_master;
+
+ dlm = item->dlm;
+ dead_node = item->u.ral.dead_node;
+ reco_master = item->u.ral.reco_master;
+ BUG_ON(dead_node != dlm->reco.dead_node);
+ BUG_ON(reco_master != dlm->reco.new_master);
+
+ mres = (struct dlm_migratable_lockres *)data;
+
+ /* lock resources should have already been moved to the
+ * dlm->reco.resources list. now move items from that list
+ * to a temp list if the dead owner matches. note that the
+ * whole cluster recovers only one node at a time, so we
+ * can safely move UNKNOWN lock resources for each recovery
+ * session. */
+ dlm_move_reco_locks_to_list(dlm, &resources, dead_node);
+
+ /* now we can begin blasting lockreses without the dlm lock */
+ list_for_each(iter, &resources) {
+ res = list_entry (iter, struct dlm_lock_resource, recovering);
+ ret = dlm_send_one_lockres(dlm, res, mres, reco_master,
+ DLM_MRES_RECOVERY);
+ if (ret < 0)
+ mlog_errno(ret);
+ }
+
+ /* move the resources back to the list */
+ spin_lock(&dlm->spinlock);
+ list_splice_init(&resources, &dlm->reco.resources);
+ spin_unlock(&dlm->spinlock);
+
+ ret = dlm_send_all_done_msg(dlm, dead_node, reco_master);
+ if (ret < 0)
+ mlog_errno(ret);
+
+ free_page((unsigned long)data);
+}
+
+
+static int dlm_send_all_done_msg(struct dlm_ctxt *dlm, u8 dead_node, u8 send_to)
+{
+ int ret, tmpret;
+ struct dlm_reco_data_done done_msg;
+
+ memset(&done_msg, 0, sizeof(done_msg));
+ done_msg.node_idx = dlm->node_num;
+ done_msg.dead_node = dead_node;
+ mlog(0, "sending DATA DONE message to %u, "
+ "my node=%u, dead node=%u\n", send_to, done_msg.node_idx,
+ done_msg.dead_node);
+
+ ret = o2net_send_message(DLM_RECO_DATA_DONE_MSG, dlm->key, &done_msg,
+ sizeof(done_msg), send_to, &tmpret);
+ /* negative status is ignored by the caller */
+ if (ret >= 0)
+ ret = tmpret;
+ return ret;
+}
+
+
+int dlm_reco_data_done_handler(struct o2net_msg *msg, u32 len, void *data)
+{
+ struct dlm_ctxt *dlm = data;
+ struct dlm_reco_data_done *done = (struct dlm_reco_data_done *)msg->buf;
+ struct list_head *iter;
+ struct dlm_reco_node_data *ndata = NULL;
+ int ret = -EINVAL;
+
+ if (!dlm_grab(dlm))
+ return -EINVAL;
+
+ mlog(0, "got DATA DONE: dead_node=%u, reco.dead_node=%u, "
+ "node_idx=%u, this node=%u\n", done->dead_node,
+ dlm->reco.dead_node, done->node_idx, dlm->node_num);
+ BUG_ON(done->dead_node != dlm->reco.dead_node);
+
+ spin_lock(&dlm_reco_state_lock);
+ list_for_each(iter, &dlm->reco.node_data) {
+ ndata = list_entry (iter, struct dlm_reco_node_data, list);
+ if (ndata->node_num != done->node_idx)
+ continue;
+
+ switch (ndata->state) {
+ case DLM_RECO_NODE_DATA_INIT:
+ case DLM_RECO_NODE_DATA_DEAD:
+ case DLM_RECO_NODE_DATA_DONE:
+ case DLM_RECO_NODE_DATA_FINALIZE_SENT:
+ mlog(ML_ERROR, "bad ndata state for node %u:"
+ " state=%d\n", ndata->node_num,
+ ndata->state);
+ BUG();
+ break;
+ case DLM_RECO_NODE_DATA_RECEIVING:
+ case DLM_RECO_NODE_DATA_REQUESTED:
+ case DLM_RECO_NODE_DATA_REQUESTING:
+ mlog(0, "node %u is DONE sending "
+ "recovery data!\n",
+ ndata->node_num);
+
+ ndata->state = DLM_RECO_NODE_DATA_DONE;
+ ret = 0;
+ break;
+ }
+ }
+ spin_unlock(&dlm_reco_state_lock);
+
+ /* wake the recovery thread, some node is done */
+ if (!ret)
+ dlm_kick_recovery_thread(dlm);
+
+ if (ret < 0)
+ mlog(ML_ERROR, "failed to find recovery node data for node "
+ "%u\n", done->node_idx);
+ dlm_put(dlm);
+
+ mlog(0, "leaving reco data done handler, ret=%d\n", ret);
+ return ret;
+}
+
+static void dlm_move_reco_locks_to_list(struct dlm_ctxt *dlm,
+ struct list_head *list,
+ u8 dead_node)
+{
+ struct dlm_lock_resource *res;
+ struct list_head *iter, *iter2;
+
+ spin_lock(&dlm->spinlock);
+ list_for_each_safe(iter, iter2, &dlm->reco.resources) {
+ res = list_entry (iter, struct dlm_lock_resource, recovering);
+ if (dlm_is_recovery_lock(res->lockname.name,
+ res->lockname.len))
+ continue;
+ if (res->owner == dead_node) {
+ mlog(0, "found lockres owned by dead node while "
+ "doing recovery for node %u. sending it.\n",
+ dead_node);
+ list_del_init(&res->recovering);
+ list_add_tail(&res->recovering, list);
+ } else if (res->owner == DLM_LOCK_RES_OWNER_UNKNOWN) {
+ mlog(0, "found UNKNOWN owner while doing recovery "
+ "for node %u. sending it.\n", dead_node);
+ list_del_init(&res->recovering);
+ list_add_tail(&res->recovering, list);
+ }
+ }
+ spin_unlock(&dlm->spinlock);
+}
+
+static inline int dlm_num_locks_in_lockres(struct dlm_lock_resource *res)
+{
+ int total_locks = 0;
+ struct list_head *iter, *queue = &res->granted;
+ int i;
+
+ for (i=0; i<3; i++) {
+ list_for_each(iter, queue)
+ total_locks++;
+ queue++;
+ }
+ return total_locks;
+}
+
+
+static int dlm_send_mig_lockres_msg(struct dlm_ctxt *dlm,
+ struct dlm_migratable_lockres *mres,
+ u8 send_to,
+ struct dlm_lock_resource *res,
+ int total_locks)
+{
+ u64 mig_cookie = be64_to_cpu(mres->mig_cookie);
+ int mres_total_locks = be32_to_cpu(mres->total_locks);
+ int sz, ret = 0, status = 0;
+ u8 orig_flags = mres->flags,
+ orig_master = mres->master;
+
+ BUG_ON(mres->num_locks > DLM_MAX_MIGRATABLE_LOCKS);
+ if (!mres->num_locks)
+ return 0;
+
+ sz = sizeof(struct dlm_migratable_lockres) +
+ (mres->num_locks * sizeof(struct dlm_migratable_lock));
+
+ /* add an all-done flag if we reached the last lock */
+ orig_flags = mres->flags;
+ BUG_ON(total_locks > mres_total_locks);
+ if (total_locks == mres_total_locks)
+ mres->flags |= DLM_MRES_ALL_DONE;
+
+ /* send it */
+ ret = o2net_send_message(DLM_MIG_LOCKRES_MSG, dlm->key, mres,
+ sz, send_to, &status);
+ if (ret < 0) {
+ /* XXX: negative status is not handled.
+ * this will end up killing this node. */
+ mlog_errno(ret);
+ } else {
+ /* might get an -ENOMEM back here */
+ ret = status;
+ if (ret < 0) {
+ mlog_errno(ret);
+
+ if (ret == -EFAULT) {
+ mlog(ML_ERROR, "node %u told me to kill "
+ "myself!\n", send_to);
+ BUG();
+ }
+ }
+ }
+
+ /* zero and reinit the message buffer */
+ dlm_init_migratable_lockres(mres, res->lockname.name,
+ res->lockname.len, mres_total_locks,
+ mig_cookie, orig_flags, orig_master);
+ return ret;
+}
+
+static void dlm_init_migratable_lockres(struct dlm_migratable_lockres *mres,
+ const char *lockname, int namelen,
+ int total_locks, u64 cookie,
+ u8 flags, u8 master)
+{
+ /* mres here is one full page */
+ memset(mres, 0, PAGE_SIZE);
+ mres->lockname_len = namelen;
+ memcpy(mres->lockname, lockname, namelen);
+ mres->num_locks = 0;
+ mres->total_locks = cpu_to_be32(total_locks);
+ mres->mig_cookie = cpu_to_be64(cookie);
+ mres->flags = flags;
+ mres->master = master;
+}
+
+
+/* returns 1 if this lock fills the network structure,
+ * 0 otherwise */
+static int dlm_add_lock_to_array(struct dlm_lock *lock,
+ struct dlm_migratable_lockres *mres, int queue)
+{
+ struct dlm_migratable_lock *ml;
+ int lock_num = mres->num_locks;
+
+ ml = &(mres->ml[lock_num]);
+ ml->cookie = lock->ml.cookie;
+ ml->type = lock->ml.type;
+ ml->convert_type = lock->ml.convert_type;
+ ml->highest_blocked = lock->ml.highest_blocked;
+ ml->list = queue;
+ if (lock->lksb) {
+ ml->flags = lock->lksb->flags;
+ /* send our current lvb */
+ if (ml->type == LKM_EXMODE ||
+ ml->type == LKM_PRMODE) {
+ /* if it is already set, this had better be a PR
+ * and it has to match */
+ if (mres->lvb[0] && (ml->type == LKM_EXMODE ||
+ memcmp(mres->lvb, lock->lksb->lvb, DLM_LVB_LEN))) {
+ mlog(ML_ERROR, "mismatched lvbs!\n");
+ __dlm_print_one_lock_resource(lock->lockres);
+ BUG();
+ }
+ memcpy(mres->lvb, lock->lksb->lvb, DLM_LVB_LEN);
+ }
+ }
+ ml->node = lock->ml.node;
+ mres->num_locks++;
+ /* we reached the max, send this network message */
+ if (mres->num_locks == DLM_MAX_MIGRATABLE_LOCKS)
+ return 1;
+ return 0;
+}
+
+
+int dlm_send_one_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *res,
+ struct dlm_migratable_lockres *mres,
+ u8 send_to, u8 flags)
+{
+ struct list_head *queue, *iter;
+ int total_locks, i;
+ u64 mig_cookie = 0;
+ struct dlm_lock *lock;
+ int ret = 0;
+
+ BUG_ON(!(flags & (DLM_MRES_RECOVERY|DLM_MRES_MIGRATION)));
+
+ mlog(0, "sending to %u\n", send_to);
+
+ total_locks = dlm_num_locks_in_lockres(res);
+ if (total_locks > DLM_MAX_MIGRATABLE_LOCKS) {
+ /* rare, but possible */
+ mlog(0, "argh. lockres has %d locks. this will "
+ "require more than one network packet to "
+ "migrate\n", total_locks);
+ mig_cookie = dlm_get_next_mig_cookie();
+ }
+
+ dlm_init_migratable_lockres(mres, res->lockname.name,
+ res->lockname.len, total_locks,
+ mig_cookie, flags, res->owner);
+
+ total_locks = 0;
+ for (i=DLM_GRANTED_LIST; i<=DLM_BLOCKED_LIST; i++) {
+ queue = dlm_list_idx_to_ptr(res, i);
+ list_for_each(iter, queue) {
+ lock = list_entry (iter, struct dlm_lock, list);
+
+ /* add another lock. */
+ total_locks++;
+ if (!dlm_add_lock_to_array(lock, mres, i))
+ continue;
+
+ /* this filled the lock message,
+ * we must send it immediately. */
+ ret = dlm_send_mig_lockres_msg(dlm, mres, send_to,
+ res, total_locks);
+ if (ret < 0) {
+ // TODO
+ mlog(ML_ERROR, "dlm_send_mig_lockres_msg "
+ "returned %d, TODO\n", ret);
+ BUG();
+ }
+ }
+ }
+ /* flush any remaining locks */
+ ret = dlm_send_mig_lockres_msg(dlm, mres, send_to, res, total_locks);
+ if (ret < 0) {
+ // TODO
+ mlog(ML_ERROR, "dlm_send_mig_lockres_msg returned %d, "
+ "TODO\n", ret);
+ BUG();
+ }
+ return ret;
+}
+
+
+
+/*
+ * this message will contain no more than one page worth of
+ * recovery data, and it will work on only one lockres.
+ * there may be many locks in this page, and we may need to wait
+ * for additional packets to complete all the locks (rare, but
+ * possible).
+ */
+/*
+ * NOTE: the allocation error cases here are scary
+ * we really cannot afford to fail an alloc in recovery
+ * do we spin? returning an error only delays the problem really
+ */
+
+int dlm_mig_lockres_handler(struct o2net_msg *msg, u32 len, void *data)
+{
+ struct dlm_ctxt *dlm = data;
+ struct dlm_migratable_lockres *mres =
+ (struct dlm_migratable_lockres *)msg->buf;
+ int ret = 0;
+ u8 real_master;
+ char *buf = NULL;
+ struct dlm_work_item *item = NULL;
+ struct dlm_lock_resource *res = NULL;
+
+ if (!dlm_grab(dlm))
+ return -EINVAL;
+
+ BUG_ON(!(mres->flags & (DLM_MRES_RECOVERY|DLM_MRES_MIGRATION)));
+
+ real_master = mres->master;
+ if (real_master == DLM_LOCK_RES_OWNER_UNKNOWN) {
+ /* cannot migrate a lockres with no master */
+ BUG_ON(!(mres->flags & DLM_MRES_RECOVERY));
+ }
+
+ mlog(0, "%s message received from node %u\n",
+ (mres->flags & DLM_MRES_RECOVERY) ?
+ "recovery" : "migration", mres->master);
+ if (mres->flags & DLM_MRES_ALL_DONE)
+ mlog(0, "all done flag. all lockres data received!\n");
+
+ ret = -ENOMEM;
+ buf = kmalloc(be16_to_cpu(msg->data_len), GFP_KERNEL);
+ item = kcalloc(1, sizeof(*item), GFP_KERNEL);
+ if (!buf || !item)
+ goto leave;
+
+ /* lookup the lock to see if we have a secondary queue for this
+ * already... just add the locks in and this will have its owner
+ * and RECOVERY flag changed when it completes. */
+ res = dlm_lookup_lockres(dlm, mres->lockname, mres->lockname_len);
+ if (res) {
+ /* this will get a ref on res */
+ /* mark it as recovering/migrating and hash it */
+ spin_lock(&res->spinlock);
+ if (mres->flags & DLM_MRES_RECOVERY) {
+ res->state |= DLM_LOCK_RES_RECOVERING;
+ } else {
+ if (res->state & DLM_LOCK_RES_MIGRATING) {
+ /* this is at least the second
+ * lockres message */
+ mlog(0, "lock %.*s is already migrating\n",
+ mres->lockname_len,
+ mres->lockname);
+ } else if (res->state & DLM_LOCK_RES_RECOVERING) {
+ /* caller should BUG */
+ mlog(ML_ERROR, "node is attempting to migrate "
+ "lock %.*s, but marked as recovering!\n",
+ mres->lockname_len, mres->lockname);
+ ret = -EFAULT;
+ spin_unlock(&res->spinlock);
+ goto leave;
+ }
+ res->state |= DLM_LOCK_RES_MIGRATING;
+ }
+ spin_unlock(&res->spinlock);
+ } else {
+ /* need to allocate, just like if it was
+ * mastered here normally */
+ res = dlm_new_lockres(dlm, mres->lockname, mres->lockname_len);
+ if (!res)
+ goto leave;
+
+ /* to match the ref that we would have gotten if
+ * dlm_lookup_lockres had succeeded */
+ dlm_lockres_get(res);
+
+ /* mark it as recovering/migrating and hash it */
+ if (mres->flags & DLM_MRES_RECOVERY)
+ res->state |= DLM_LOCK_RES_RECOVERING;
+ else
+ res->state |= DLM_LOCK_RES_MIGRATING;
+
+ spin_lock(&dlm->spinlock);
+ __dlm_insert_lockres(dlm, res);
+ spin_unlock(&dlm->spinlock);
+
+ /* now that the new lockres is inserted,
+ * make it usable by other processes */
+ spin_lock(&res->spinlock);
+ res->state &= ~DLM_LOCK_RES_IN_PROGRESS;
+ spin_unlock(&res->spinlock);
+
+ /* add an extra ref for just-allocated lockres
+ * otherwise the lockres will be purged immediately */
+ dlm_lockres_get(res);
+
+ }
+
+ /* at this point we have allocated everything we need,
+ * and we have a hashed lockres with an extra ref and
+ * the proper res->state flags. */
+ ret = 0;
+ if (mres->master == DLM_LOCK_RES_OWNER_UNKNOWN) {
+ /* migration cannot have an unknown master */
+ BUG_ON(!(mres->flags & DLM_MRES_RECOVERY));
+ mlog(0, "recovery has passed me a lockres with an "
+ "unknown owner.. will need to requery: "
+ "%.*s\n", mres->lockname_len, mres->lockname);
+ } else {
+ spin_lock(&res->spinlock);
+ dlm_change_lockres_owner(dlm, res, dlm->node_num);
+ spin_unlock(&res->spinlock);
+ }
+
+ /* queue up work for dlm_mig_lockres_worker */
+ dlm_grab(dlm); /* get an extra ref for the work item */
+ memcpy(buf, msg->buf, be16_to_cpu(msg->data_len)); /* copy the whole message */
+ dlm_init_work_item(dlm, item, dlm_mig_lockres_worker, buf);
+ item->u.ml.lockres = res; /* already have a ref */
+ item->u.ml.real_master = real_master;
+ spin_lock(&dlm->work_lock);
+ list_add_tail(&item->list, &dlm->work_list);
+ spin_unlock(&dlm->work_lock);
+ schedule_work(&dlm->dispatched_work);
+
+leave:
+ dlm_put(dlm);
+ if (ret < 0) {
+ if (buf)
+ kfree(buf);
+ if (item)
+ kfree(item);
+ }
+
+ mlog_exit(ret);
+ return ret;
+}
+
+
+static void dlm_mig_lockres_worker(struct dlm_work_item *item, void *data)
+{
+ struct dlm_ctxt *dlm = data;
+ struct dlm_migratable_lockres *mres;
+ int ret = 0;
+ struct dlm_lock_resource *res;
+ u8 real_master;
+
+ dlm = item->dlm;
+ mres = (struct dlm_migratable_lockres *)data;
+
+ res = item->u.ml.lockres;
+ real_master = item->u.ml.real_master;
+
+ if (real_master == DLM_LOCK_RES_OWNER_UNKNOWN) {
+ /* this case is super-rare. only occurs if
+ * node death happens during migration. */
+again:
+ ret = dlm_lockres_master_requery(dlm, res, &real_master);
+ if (ret < 0) {
+ mlog(0, "dlm_lockres_master_requery failure: %d\n",
+ ret);
+ goto again;
+ }
+ if (real_master == DLM_LOCK_RES_OWNER_UNKNOWN) {
+ mlog(0, "lockres %.*s not claimed. "
+ "this node will take it.\n",
+ res->lockname.len, res->lockname.name);
+ } else {
+ mlog(0, "master needs to respond to sender "
+ "that node %u still owns %.*s\n",
+ real_master, res->lockname.len,
+ res->lockname.name);
+ /* cannot touch this lockres */
+ goto leave;
+ }
+ }
+
+ ret = dlm_process_recovery_data(dlm, res, mres);
+ if (ret < 0)
+ mlog(0, "dlm_process_recovery_data returned %d\n", ret);
+ else
+ mlog(0, "dlm_process_recovery_data succeeded\n");
+
+ if ((mres->flags & (DLM_MRES_MIGRATION|DLM_MRES_ALL_DONE)) ==
+ (DLM_MRES_MIGRATION|DLM_MRES_ALL_DONE)) {
+ ret = dlm_finish_migration(dlm, res, mres->master);
+ if (ret < 0)
+ mlog_errno(ret);
+ }
+
+leave:
+ kfree(data);
+ mlog_exit(ret);
+}
+
+
+
+static int dlm_lockres_master_requery(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res,
+ u8 *real_master)
+{
+ struct dlm_node_iter iter;
+ int nodenum;
+ int ret = 0;
+
+ *real_master = DLM_LOCK_RES_OWNER_UNKNOWN;
+
+ /* we only reach here if one of the two nodes in a
+ * migration died while the migration was in progress.
+ * at this point we need to requery the master. we
+ * know that the new_master got as far as creating
+ * an mle on at least one node, but we do not know
+ * if any nodes had actually cleared the mle and set
+ * the master to the new_master. the old master
+ * is supposed to set the owner to UNKNOWN in the
+ * event of a new_master death, so the only possible
+ * responses that we can get from nodes here are
+ * that the master is new_master, or that the master
+ * is UNKNOWN.
+ * if all nodes come back with UNKNOWN then we know
+ * the lock needs remastering here.
+ * if any node comes back with a valid master, check
+ * to see if that master is the one that we are
+ * recovering. if so, then the new_master died and
+ * we need to remaster this lock. if not, then the
+ * new_master survived and that node will respond to
+ * other nodes about the owner.
+ * if there is an owner, this node needs to dump this
+ * lockres and alert the sender that this lockres
+ * was rejected. */
+ spin_lock(&dlm->spinlock);
+ dlm_node_iter_init(dlm->domain_map, &iter);
+ spin_unlock(&dlm->spinlock);
+
+ while ((nodenum = dlm_node_iter_next(&iter)) >= 0) {
+ /* do not send to self */
+ if (nodenum == dlm->node_num)
+ continue;
+ ret = dlm_do_master_requery(dlm, res, nodenum, real_master);
+ if (ret < 0) {
+ mlog_errno(ret);
+ BUG();
+ /* TODO: need to figure a way to restart this */
+ }
+ if (*real_master != DLM_LOCK_RES_OWNER_UNKNOWN) {
+ mlog(0, "lock master is %u\n", *real_master);
+ break;
+ }
+ }
+ return ret;
+}
+
+
+static int dlm_do_master_requery(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res,
+ u8 nodenum, u8 *real_master)
+{
+ int ret = -EINVAL;
+ struct dlm_master_requery req;
+ int status = DLM_LOCK_RES_OWNER_UNKNOWN;
+
+ memset(&req, 0, sizeof(req));
+ req.node_idx = dlm->node_num;
+ req.namelen = res->lockname.len;
+ memcpy(req.name, res->lockname.name, res->lockname.len);
+
+ ret = o2net_send_message(DLM_MASTER_REQUERY_MSG, dlm->key,
+ &req, sizeof(req), nodenum, &status);
+ /* XXX: negative status not handled properly here. */
+ if (ret < 0)
+ mlog_errno(ret);
+ else {
+ BUG_ON(status < 0);
+ BUG_ON(status > DLM_LOCK_RES_OWNER_UNKNOWN);
+ *real_master = (u8) (status & 0xff);
+ mlog(0, "node %u responded to master requery with %u\n",
+ nodenum, *real_master);
+ ret = 0;
+ }
+ return ret;
+}
+
+
+/* this function cannot error, so unless the sending
+ * or receiving of the message failed, the owner can
+ * be trusted */
+int dlm_master_requery_handler(struct o2net_msg *msg, u32 len, void *data)
+{
+ struct dlm_ctxt *dlm = data;
+ struct dlm_master_requery *req = (struct dlm_master_requery *)msg->buf;
+ struct dlm_lock_resource *res = NULL;
+ int master = DLM_LOCK_RES_OWNER_UNKNOWN;
+ u32 flags = DLM_ASSERT_MASTER_REQUERY;
+
+ if (!dlm_grab(dlm)) {
+ /* since the domain has gone away on this
+ * node, the proper response is UNKNOWN */
+ return master;
+ }
+
+ spin_lock(&dlm->spinlock);
+ res = __dlm_lookup_lockres(dlm, req->name, req->namelen);
+ if (res) {
+ spin_lock(&res->spinlock);
+ master = res->owner;
+ if (master == dlm->node_num) {
+ int ret = dlm_dispatch_assert_master(dlm, res,
+ 0, 0, flags);
+ if (ret < 0) {
+ mlog_errno(-ENOMEM);
+ /* retry!? */
+ BUG();
+ }
+ }
+ spin_unlock(&res->spinlock);
+ }
+ spin_unlock(&dlm->spinlock);
+
+ dlm_put(dlm);
+ return master;
+}
+
+static inline struct list_head *
+dlm_list_num_to_pointer(struct dlm_lock_resource *res, int list_num)
+{
+ struct list_head *ret;
+ BUG_ON(list_num < 0);
+ BUG_ON(list_num > 2);
+ ret = &(res->granted);
+ ret += list_num;
+ return ret;
+}
+/* TODO: do ast flush business
+ * TODO: do MIGRATING and RECOVERING spinning
+ */
+
+/*
+* NOTE about in-flight requests during migration:
+*
+* Before attempting the migrate, the master has marked the lockres as
+* MIGRATING and then flushed all of its pending ASTS. So any in-flight
+* requests either got queued before the MIGRATING flag got set, in which
+* case the lock data will reflect the change and a return message is on
+* the way, or the request failed to get in before MIGRATING got set. In
+* this case, the caller will be told to spin and wait for the MIGRATING
+* flag to be dropped, then recheck the master.
+* This holds true for the convert, cancel and unlock cases, and since lvb
+* updates are tied to these same messages, it applies to lvb updates as
+* well. For the lock case, there is no way a lock can be on the master
+* queue and not be on the secondary queue since the lock is always added
+* locally first. This means that the new target node will never be sent
+* a lock that he doesn't already have on the list.
+* In total, this means that the local lock is correct and should not be
+* updated to match the one sent by the master. Any messages sent back
+* from the master before the MIGRATING flag will bring the lock properly
+* up-to-date, and the change will be ordered properly for the waiter.
+* We will *not* attempt to modify the lock underneath the waiter.
+*/
+
+static int dlm_process_recovery_data(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res,
+ struct dlm_migratable_lockres *mres)
+{
+ struct dlm_migratable_lock *ml;
+ struct list_head *queue;
+ struct dlm_lock *newlock = NULL;
+ struct dlm_lockstatus *lksb = NULL;
+ int ret = 0;
+ int i;
+ struct list_head *iter;
+ struct dlm_lock *lock = NULL;
+
+ mlog(0, "running %d locks for this lockres\n", mres->num_locks);
+ for (i=0; i<mres->num_locks; i++) {
+ ml = &(mres->ml[i]);
+ BUG_ON(ml->highest_blocked != LKM_IVMODE);
+ newlock = NULL;
+ lksb = NULL;
+
+ queue = dlm_list_num_to_pointer(res, ml->list);
+
+ /* if the lock is for the local node it needs to
+ * be moved to the proper location within the queue.
+ * do not allocate a new lock structure. */
+ if (ml->node == dlm->node_num) {
+ /* MIGRATION ONLY! */
+ BUG_ON(!(mres->flags & DLM_MRES_MIGRATION));
+
+ spin_lock(&res->spinlock);
+ list_for_each(iter, queue) {
+ lock = list_entry (iter, struct dlm_lock, list);
+ if (lock->ml.cookie != ml->cookie)
+ lock = NULL;
+ else
+ break;
+ }
+
+ /* lock is always created locally first, and
+ * destroyed locally last. it must be on the list */
+ if (!lock) {
+ mlog(ML_ERROR, "could not find local lock "
+ "with cookie %"MLFu64"!\n",
+ ml->cookie);
+ BUG();
+ }
+ BUG_ON(lock->ml.node != ml->node);
+
+ /* see NOTE above about why we do not update
+ * to match the master here */
+
+ /* move the lock to its proper place */
+ /* do not alter lock refcount. switching lists. */
+ list_del_init(&lock->list);
+ list_add_tail(&lock->list, queue);
+ spin_unlock(&res->spinlock);
+
+ mlog(0, "just reordered a local lock!\n");
+ continue;
+ }
+
+ /* lock is for another node. */
+ newlock = dlm_new_lock(ml->type, ml->node,
+ be64_to_cpu(ml->cookie), NULL);
+ if (!newlock) {
+ ret = -ENOMEM;
+ goto leave;
+ }
+ lksb = newlock->lksb;
+ dlm_lock_attach_lockres(newlock, res);
+
+ if (ml->convert_type != LKM_IVMODE) {
+ BUG_ON(queue != &res->converting);
+ newlock->ml.convert_type = ml->convert_type;
+ }
+ lksb->flags |= (ml->flags &
+ (DLM_LKSB_PUT_LVB|DLM_LKSB_GET_LVB));
+
+ if (mres->lvb[0]) {
+ if (lksb->flags & DLM_LKSB_PUT_LVB) {
+ /* other node was trying to update
+ * lvb when node died. recreate the
+ * lksb with the updated lvb. */
+ memcpy(lksb->lvb, mres->lvb, DLM_LVB_LEN);
+ } else {
+ /* otherwise, the node is sending its
+ * most recent valid lvb info */
+ BUG_ON(ml->type != LKM_EXMODE &&
+ ml->type != LKM_PRMODE);
+ if (res->lvb[0] && (ml->type == LKM_EXMODE ||
+ memcmp(res->lvb, mres->lvb, DLM_LVB_LEN))) {
+ mlog(ML_ERROR, "received bad lvb!\n");
+ __dlm_print_one_lock_resource(res);
+ BUG();
+ }
+ memcpy(res->lvb, mres->lvb, DLM_LVB_LEN);
+ }
+ }
+
+
+ /* NOTE:
+ * wrt lock queue ordering and recovery:
+ * 1. order of locks on granted queue is
+ * meaningless.
+ * 2. order of locks on converting queue is
+ * LOST with the node death. sorry charlie.
+ * 3. order of locks on the blocked queue is
+ * also LOST.
+ * order of locks does not affect integrity, it
+ * just means that a lock request may get pushed
+ * back in line as a result of the node death.
+ * also note that for a given node the lock order
+ * for its secondary queue locks is preserved
+ * relative to each other, but clearly *not*
+ * preserved relative to locks from other nodes.
+ */
+ spin_lock(&res->spinlock);
+ dlm_lock_get(newlock);
+ list_add_tail(&newlock->list, queue);
+ spin_unlock(&res->spinlock);
+ }
+ mlog(0, "done running all the locks\n");
+
+leave:
+ if (ret < 0) {
+ mlog_errno(ret);
+ if (newlock)
+ dlm_lock_put(newlock);
+ }
+
+ mlog_exit(ret);
+ return ret;
+}
+
+void dlm_move_lockres_to_recovery_list(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res)
+{
+ int i;
+ struct list_head *queue, *iter, *iter2;
+ struct dlm_lock *lock;
+
+ res->state |= DLM_LOCK_RES_RECOVERING;
+ if (!list_empty(&res->recovering))
+ list_del_init(&res->recovering);
+ list_add_tail(&res->recovering, &dlm->reco.resources);
+
+ /* find any pending locks and put them back on proper list */
+ for (i=DLM_BLOCKED_LIST; i>=DLM_GRANTED_LIST; i--) {
+ queue = dlm_list_idx_to_ptr(res, i);
+ list_for_each_safe(iter, iter2, queue) {
+ lock = list_entry (iter, struct dlm_lock, list);
+ dlm_lock_get(lock);
+ if (lock->convert_pending) {
+ /* move converting lock back to granted */
+ BUG_ON(i != DLM_CONVERTING_LIST);
+ mlog(0, "node died with convert pending "
+ "on %.*s. move back to granted list.\n",
+ res->lockname.len, res->lockname.name);
+ dlm_revert_pending_convert(res, lock);
+ lock->convert_pending = 0;
+ } else if (lock->lock_pending) {
+ /* remove pending lock requests completely */
+ BUG_ON(i != DLM_BLOCKED_LIST);
+ mlog(0, "node died with lock pending "
+ "on %.*s. remove from blocked list and skip.\n",
+ res->lockname.len, res->lockname.name);
+ /* lock will be floating until ref in
+ * dlmlock_remote is freed after the network
+ * call returns. ok for it to not be on any
+ * list since no ast can be called
+ * (the master is dead). */
+ dlm_revert_pending_lock(res, lock);
+ lock->lock_pending = 0;
+ } else if (lock->unlock_pending) {
+ /* if an unlock was in progress, treat as
+ * if this had completed successfully
+ * before sending this lock state to the
+ * new master. note that the dlm_unlock
+ * call is still responsible for calling
+ * the unlockast. that will happen after
+ * the network call times out. for now,
+ * just move lists to prepare the new
+ * recovery master. */
+ BUG_ON(i != DLM_GRANTED_LIST);
+ mlog(0, "node died with unlock pending "
+ "on %.*s. remove from blocked list and skip.\n",
+ res->lockname.len, res->lockname.name);
+ dlm_commit_pending_unlock(res, lock);
+ lock->unlock_pending = 0;
+ } else if (lock->cancel_pending) {
+ /* if a cancel was in progress, treat as
+ * if this had completed successfully
+ * before sending this lock state to the
+ * new master */
+ BUG_ON(i != DLM_CONVERTING_LIST);
+ mlog(0, "node died with cancel pending "
+ "on %.*s. move back to granted list.\n",
+ res->lockname.len, res->lockname.name);
+ dlm_commit_pending_cancel(res, lock);
+ lock->cancel_pending = 0;
+ }
+ dlm_lock_put(lock);
+ }
+ }
+}
+
+
+
+/* removes all recovered locks from the recovery list.
+ * sets the res->owner to the new master.
+ * unsets the RECOVERY flag and wakes waiters. */
+static void dlm_finish_local_lockres_recovery(struct dlm_ctxt *dlm,
+ u8 dead_node, u8 new_master)
+{
+ int i;
+ struct list_head *iter, *iter2, *bucket;
+ struct dlm_lock_resource *res;
+
+ mlog_entry_void();
+
+ assert_spin_locked(&dlm->spinlock);
+
+ list_for_each_safe(iter, iter2, &dlm->reco.resources) {
+ res = list_entry (iter, struct dlm_lock_resource, recovering);
+ if (res->owner == dead_node) {
+ list_del_init(&res->recovering);
+ spin_lock(&res->spinlock);
+ dlm_change_lockres_owner(dlm, res, new_master);
+ res->state &= ~DLM_LOCK_RES_RECOVERING;
+ __dlm_dirty_lockres(dlm, res);
+ spin_unlock(&res->spinlock);
+ wake_up(&res->wq);
+ }
+ }
+
+ /* this will become unnecessary eventually, but
+ * for now we need to run the whole hash, clear
+ * the RECOVERING state and set the owner
+ * if necessary */
+ for (i=0; i<DLM_HASH_SIZE; i++) {
+ bucket = &(dlm->resources[i]);
+ list_for_each(iter, bucket) {
+ res = list_entry (iter, struct dlm_lock_resource, list);
+ if (res->state & DLM_LOCK_RES_RECOVERING) {
+ if (res->owner == dead_node) {
+ mlog(0, "(this=%u) res %.*s owner=%u "
+ "was not on recovering list, but "
+ "clearing state anyway\n",
+ dlm->node_num, res->lockname.len,
+ res->lockname.name, new_master);
+ } else if (res->owner == dlm->node_num) {
+ mlog(0, "(this=%u) res %.*s owner=%u "
+ "was not on recovering list, "
+ "owner is THIS node, clearing\n",
+ dlm->node_num, res->lockname.len,
+ res->lockname.name, new_master);
+ } else
+ continue;
+
+ spin_lock(&res->spinlock);
+ dlm_change_lockres_owner(dlm, res, new_master);
+ res->state &= ~DLM_LOCK_RES_RECOVERING;
+ __dlm_dirty_lockres(dlm, res);
+ spin_unlock(&res->spinlock);
+ wake_up(&res->wq);
+ }
+ }
+ }
+}
+
+static inline int dlm_lvb_needs_invalidation(struct dlm_lock *lock, int local)
+{
+ if (local) {
+ if (lock->ml.type != LKM_EXMODE &&
+ lock->ml.type != LKM_PRMODE)
+ return 1;
+ } else if (lock->ml.type == LKM_EXMODE)
+ return 1;
+ return 0;
+}
+
+static void dlm_revalidate_lvb(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res, u8 dead_node)
+{
+ struct list_head *iter, *queue;
+ struct dlm_lock *lock;
+ int blank_lvb = 0, local = 0;
+ int i;
+ u8 search_node;
+
+ assert_spin_locked(&dlm->spinlock);
+ assert_spin_locked(&res->spinlock);
+
+ if (res->owner == dlm->node_num)
+ /* if this node owned the lockres, and if the dead node
+ * had an EX when he died, blank out the lvb */
+ search_node = dead_node;
+ else {
+ /* if this is a secondary lockres, and we had no EX or PR
+ * locks granted, we can no longer trust the lvb */
+ search_node = dlm->node_num;
+ local = 1; /* check local state for valid lvb */
+ }
+
+ for (i=DLM_GRANTED_LIST; i<=DLM_CONVERTING_LIST; i++) {
+ queue = dlm_list_idx_to_ptr(res, i);
+ list_for_each(iter, queue) {
+ lock = list_entry (iter, struct dlm_lock, list);
+ if (lock->ml.node == search_node) {
+ if (dlm_lvb_needs_invalidation(lock, local)) {
+ /* zero the lksb lvb and lockres lvb */
+ blank_lvb = 1;
+ memset(lock->lksb->lvb, 0, DLM_LVB_LEN);
+ }
+ }
+ }
+ }
+
+ if (blank_lvb) {
+ mlog(0, "clearing %.*s lvb, dead node %u had EX\n",
+ res->lockname.len, res->lockname.name, dead_node);
+ memset(res->lvb, 0, DLM_LVB_LEN);
+ }
+}
+
+static void dlm_free_dead_locks(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res, u8 dead_node)
+{
+ struct list_head *iter, *tmpiter;
+ struct dlm_lock *lock;
+
+ /* this node is the lockres master:
+ * 1) remove any stale locks for the dead node
+ * 2) if the dead node had an EX when he died, blank out the lvb
+ */
+ assert_spin_locked(&dlm->spinlock);
+ assert_spin_locked(&res->spinlock);
+
+ /* TODO: check pending_asts, pending_basts here */
+ list_for_each_safe(iter, tmpiter, &res->granted) {
+ lock = list_entry (iter, struct dlm_lock, list);
+ if (lock->ml.node == dead_node) {
+ list_del_init(&lock->list);
+ dlm_lock_put(lock);
+ }
+ }
+ list_for_each_safe(iter, tmpiter, &res->converting) {
+ lock = list_entry (iter, struct dlm_lock, list);
+ if (lock->ml.node == dead_node) {
+ list_del_init(&lock->list);
+ dlm_lock_put(lock);
+ }
+ }
+ list_for_each_safe(iter, tmpiter, &res->blocked) {
+ lock = list_entry (iter, struct dlm_lock, list);
+ if (lock->ml.node == dead_node) {
+ list_del_init(&lock->list);
+ dlm_lock_put(lock);
+ }
+ }
+
+ /* do not kick thread yet */
+ __dlm_dirty_lockres(dlm, res);
+}
+
+/* if this node is the recovery master, and there are no
+ * locks for a given lockres owned by this node that are in
+ * either PR or EX mode, zero out the lvb before requesting.
+ *
+ */
+
+
+static void dlm_do_local_recovery_cleanup(struct dlm_ctxt *dlm, u8 dead_node)
+{
+ struct list_head *iter;
+ struct dlm_lock_resource *res;
+ int i;
+ struct list_head *bucket;
+
+
+ /* purge any stale mles */
+ dlm_clean_master_list(dlm, dead_node);
+
+ /*
+ * now clean up all lock resources. there are two rules:
+ *
+ * 1) if the dead node was the master, move the lockres
+ * to the recovering list. set the RECOVERING flag.
+ * this lockres needs to be cleaned up before it can
+ * be used further.
+ *
+ * 2) if this node was the master, remove all locks from
+ * each of the lockres queues that were owned by the
+ * dead node. once recovery finishes, the dlm thread
+ * can be kicked again to see if any ASTs or BASTs
+ * need to be fired as a result.
+ */
+ for (i=0; i<DLM_HASH_SIZE; i++) {
+ bucket = &(dlm->resources[i]);
+ list_for_each(iter, bucket) {
+ res = list_entry (iter, struct dlm_lock_resource, list);
+ if (dlm_is_recovery_lock(res->lockname.name,
+ res->lockname.len))
+ continue;
+
+ spin_lock(&res->spinlock);
+ /* zero the lvb if necessary */
+ dlm_revalidate_lvb(dlm, res, dead_node);
+ if (res->owner == dead_node)
+ dlm_move_lockres_to_recovery_list(dlm, res);
+ else if (res->owner == dlm->node_num) {
+ dlm_free_dead_locks(dlm, res, dead_node);
+ __dlm_lockres_calc_usage(dlm, res);
+ }
+ spin_unlock(&res->spinlock);
+ }
+ }
+
+}
+
+static void __dlm_hb_node_down(struct dlm_ctxt *dlm, int idx)
+{
+ assert_spin_locked(&dlm->spinlock);
+
+ /* check to see if the node is already considered dead */
+ if (!test_bit(idx, dlm->live_nodes_map)) {
+ mlog(0, "for domain %s, node %d is already dead. "
+ "another node likely did recovery already.\n",
+ dlm->name, idx);
+ return;
+ }
+
+ /* check to see if we do not care about this node */
+ if (!test_bit(idx, dlm->domain_map)) {
+ /* This also catches the case that we get a node down
+ * but haven't joined the domain yet. */
+ mlog(0, "node %u already removed from domain!\n", idx);
+ return;
+ }
+
+ clear_bit(idx, dlm->live_nodes_map);
+
+ /* Clean up join state on node death. */
+ if (dlm->joining_node == idx) {
+ mlog(0, "Clearing join state for node %u\n", idx);
+ __dlm_set_joining_node(dlm, DLM_LOCK_RES_OWNER_UNKNOWN);
+ }
+
+ /* make sure local cleanup occurs before the heartbeat events */
+ if (!test_bit(idx, dlm->recovery_map))
+ dlm_do_local_recovery_cleanup(dlm, idx);
+
+ /* notify anything attached to the heartbeat events */
+ dlm_hb_event_notify_attached(dlm, idx, 0);
+
+ mlog(0, "node %u being removed from domain map!\n", idx);
+ clear_bit(idx, dlm->domain_map);
+ /* wake up migration waiters if a node goes down.
+ * perhaps later we can genericize this for other waiters. */
+ wake_up(&dlm->migration_wq);
+
+ if (test_bit(idx, dlm->recovery_map))
+ mlog(0, "domain %s, node %u already added "
+ "to recovery map!\n", dlm->name, idx);
+ else
+ set_bit(idx, dlm->recovery_map);
+}
+
+void dlm_hb_node_down_cb(struct o2nm_node *node, int idx, void *data)
+{
+ struct dlm_ctxt *dlm = data;
+
+ if (!dlm_grab(dlm))
+ return;
+
+ spin_lock(&dlm->spinlock);
+ __dlm_hb_node_down(dlm, idx);
+ spin_unlock(&dlm->spinlock);
+
+ dlm_put(dlm);
+}
+
+void dlm_hb_node_up_cb(struct o2nm_node *node, int idx, void *data)
+{
+ struct dlm_ctxt *dlm = data;
+
+ if (!dlm_grab(dlm))
+ return;
+
+ spin_lock(&dlm->spinlock);
+
+ set_bit(idx, dlm->live_nodes_map);
+
+ /* notify any mles attached to the heartbeat events */
+ dlm_hb_event_notify_attached(dlm, idx, 1);
+
+ spin_unlock(&dlm->spinlock);
+
+ dlm_put(dlm);
+}
+
+static void dlm_reco_ast(void *astdata)
+{
+ struct dlm_ctxt *dlm = astdata;
+ mlog(0, "ast for recovery lock fired!, this=%u, dlm=%s\n",
+ dlm->node_num, dlm->name);
+}
+static void dlm_reco_bast(void *astdata, int blocked_type)
+{
+ struct dlm_ctxt *dlm = astdata;
+ mlog(0, "bast for recovery lock fired!, this=%u, dlm=%s\n",
+ dlm->node_num, dlm->name);
+}
+static void dlm_reco_unlock_ast(void *astdata, enum dlm_status st)
+{
+ mlog(0, "unlockast for recovery lock fired!\n");
+}
+
+
+static int dlm_pick_recovery_master(struct dlm_ctxt *dlm)
+{
+ enum dlm_status ret;
+ struct dlm_lockstatus lksb;
+ int status = -EINVAL;
+
+ mlog(0, "starting recovery of %s at %lu, dead=%u, this=%u\n",
+ dlm->name, jiffies, dlm->reco.dead_node, dlm->node_num);
+retry:
+ memset(&lksb, 0, sizeof(lksb));
+
+ ret = dlmlock(dlm, LKM_EXMODE, &lksb, LKM_NOQUEUE|LKM_RECOVERY,
+ DLM_RECOVERY_LOCK_NAME, dlm_reco_ast, dlm, dlm_reco_bast);
+
+ if (ret == DLM_NORMAL) {
+ mlog(0, "dlm=%s dlmlock says I got it (this=%u)\n",
+ dlm->name, dlm->node_num);
+ /* I am master, send message to all nodes saying
+ * that I am beginning a recovery session */
+ status = dlm_send_begin_reco_message(dlm,
+ dlm->reco.dead_node);
+
+ /* recovery lock is a special case. ast will not get fired,
+ * so just go ahead and unlock it. */
+ ret = dlmunlock(dlm, &lksb, 0, dlm_reco_unlock_ast, dlm);
+ if (ret != DLM_NORMAL) {
+ /* this would really suck. this could only happen
+ * if there was a network error during the unlock
+ * because of node death. this means the unlock
+ * is actually "done" and the lock structure is
+ * even freed. we can continue, but only
+ * because this specific lock name is special. */
+ mlog(0, "dlmunlock returned %d\n", ret);
+ }
+
+ if (status < 0) {
+ mlog(0, "failed to send recovery message. "
+ "must retry with new node map.\n");
+ goto retry;
+ }
+ } else if (ret == DLM_NOTQUEUED) {
+ mlog(0, "dlm=%s dlmlock says another node got it (this=%u)\n",
+ dlm->name, dlm->node_num);
+ /* another node is master. wait on
+ * reco.new_master != O2NM_INVALID_NODE_NUM */
+ status = -EEXIST;
+ }
+
+ return status;
+}
+
+static int dlm_send_begin_reco_message(struct dlm_ctxt *dlm, u8 dead_node)
+{
+ struct dlm_begin_reco br;
+ int ret = 0;
+ struct dlm_node_iter iter;
+ int nodenum;
+ int status;
+
+ mlog_entry("%u\n", dead_node);
+
+ mlog(0, "dead node is %u\n", dead_node);
+
+ spin_lock(&dlm->spinlock);
+ dlm_node_iter_init(dlm->domain_map, &iter);
+ spin_unlock(&dlm->spinlock);
+
+ clear_bit(dead_node, iter.node_map);
+
+ memset(&br, 0, sizeof(br));
+ br.node_idx = dlm->node_num;
+ br.dead_node = dead_node;
+
+ while ((nodenum = dlm_node_iter_next(&iter)) >= 0) {
+ ret = 0;
+ if (nodenum == dead_node) {
+ mlog(0, "not sending begin reco to dead node "
+ "%u\n", dead_node);
+ continue;
+ }
+ if (nodenum == dlm->node_num) {
+ mlog(0, "not sending begin reco to self\n");
+ continue;
+ }
+
+ ret = -EINVAL;
+ mlog(0, "attempting to send begin reco msg to %d\n",
+ nodenum);
+ ret = o2net_send_message(DLM_BEGIN_RECO_MSG, dlm->key,
+ &br, sizeof(br), nodenum, &status);
+ /* negative status is handled ok by caller here */
+ if (ret >= 0)
+ ret = status;
+ if (ret < 0) {
+ struct dlm_lock_resource *res;
+ mlog_errno(ret);
+ mlog(ML_ERROR, "begin reco of dlm %s to node %u "
+ " returned %d\n", dlm->name, nodenum, ret);
+ res = dlm_lookup_lockres(dlm, DLM_RECOVERY_LOCK_NAME,
+ DLM_RECOVERY_LOCK_NAME_LEN);
+ if (res) {
+ dlm_print_one_lock_resource(res);
+ dlm_lockres_put(res);
+ } else {
+ mlog(ML_ERROR, "recovery lock not found\n");
+ }
+ break;
+ }
+ }
+
+ return ret;
+}
+
+int dlm_begin_reco_handler(struct o2net_msg *msg, u32 len, void *data)
+{
+ struct dlm_ctxt *dlm = data;
+ struct dlm_begin_reco *br = (struct dlm_begin_reco *)msg->buf;
+
+ /* ok to return 0, domain has gone away */
+ if (!dlm_grab(dlm))
+ return 0;
+
+ mlog(0, "node %u wants to recover node %u\n",
+ br->node_idx, br->dead_node);
+
+ dlm_fire_domain_eviction_callbacks(dlm, br->dead_node);
+
+ spin_lock(&dlm->spinlock);
+ if (dlm->reco.new_master != O2NM_INVALID_NODE_NUM) {
+ mlog(0, "new_master already set to %u!\n",
+ dlm->reco.new_master);
+ }
+ if (dlm->reco.dead_node != O2NM_INVALID_NODE_NUM) {
+ mlog(0, "dead_node already set to %u!\n",
+ dlm->reco.dead_node);
+ }
+ dlm->reco.new_master = br->node_idx;
+ dlm->reco.dead_node = br->dead_node;
+ if (!test_bit(br->dead_node, dlm->recovery_map)) {
+ mlog(ML_ERROR, "recovery master %u sees %u as dead, but this "
+ "node has not yet. marking %u as dead\n",
+ br->node_idx, br->dead_node, br->dead_node);
+ __dlm_hb_node_down(dlm, br->dead_node);
+ }
+ spin_unlock(&dlm->spinlock);
+
+ dlm_kick_recovery_thread(dlm);
+ dlm_put(dlm);
+ return 0;
+}
+
+static int dlm_send_finalize_reco_message(struct dlm_ctxt *dlm)
+{
+ int ret = 0;
+ struct dlm_finalize_reco fr;
+ struct dlm_node_iter iter;
+ int nodenum;
+ int status;
+
+ mlog(0, "finishing recovery for node %s:%u\n",
+ dlm->name, dlm->reco.dead_node);
+
+ spin_lock(&dlm->spinlock);
+ dlm_node_iter_init(dlm->domain_map, &iter);
+ spin_unlock(&dlm->spinlock);
+
+ memset(&fr, 0, sizeof(fr));
+ fr.node_idx = dlm->node_num;
+ fr.dead_node = dlm->reco.dead_node;
+
+ while ((nodenum = dlm_node_iter_next(&iter)) >= 0) {
+ if (nodenum == dlm->node_num)
+ continue;
+ ret = o2net_send_message(DLM_FINALIZE_RECO_MSG, dlm->key,
+ &fr, sizeof(fr), nodenum, &status);
+ if (ret >= 0) {
+ ret = status;
+ if (dlm_is_host_down(ret)) {
+ /* this has no effect on this recovery
+ * session, so set the status to zero to
+ * finish out the last recovery */
+ mlog(ML_ERROR, "node %u went down after this "
+ "node finished recovery.\n", nodenum);
+ ret = 0;
+ }
+ }
+ if (ret < 0) {
+ mlog_errno(ret);
+ break;
+ }
+ }
+
+ return ret;
+}
+
+int dlm_finalize_reco_handler(struct o2net_msg *msg, u32 len, void *data)
+{
+ struct dlm_ctxt *dlm = data;
+ struct dlm_finalize_reco *fr = (struct dlm_finalize_reco *)msg->buf;
+
+ /* ok to return 0, domain has gone away */
+ if (!dlm_grab(dlm))
+ return 0;
+
+ mlog(0, "node %u finalizing recovery of node %u\n",
+ fr->node_idx, fr->dead_node);
+
+ spin_lock(&dlm->spinlock);
+
+ if (dlm->reco.new_master != fr->node_idx) {
+ mlog(ML_ERROR, "node %u sent recovery finalize msg, but node "
+ "%u is supposed to be the new master, dead=%u\n",
+ fr->node_idx, dlm->reco.new_master, fr->dead_node);
+ BUG();
+ }
+ if (dlm->reco.dead_node != fr->dead_node) {
+ mlog(ML_ERROR, "node %u sent recovery finalize msg for dead "
+ "node %u, but node %u is supposed to be dead\n",
+ fr->node_idx, fr->dead_node, dlm->reco.dead_node);
+ BUG();
+ }
+
+ dlm_finish_local_lockres_recovery(dlm, fr->dead_node, fr->node_idx);
+
+ spin_unlock(&dlm->spinlock);
+
+ dlm_reset_recovery(dlm);
+
+ dlm_kick_recovery_thread(dlm);
+ dlm_put(dlm);
+ return 0;
+}
--- /dev/null
+/* -*- mode: c; c-basic-offset: 8; -*-
+ * vim: noexpandtab sw=8 ts=8 sts=0:
+ *
+ * dlmthread.c
+ *
+ * standalone DLM module
+ *
+ * Copyright (C) 2004 Oracle. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ *
+ */
+
+
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/highmem.h>
+#include <linux/utsname.h>
+#include <linux/init.h>
+#include <linux/sysctl.h>
+#include <linux/random.h>
+#include <linux/blkdev.h>
+#include <linux/socket.h>
+#include <linux/inet.h>
+#include <linux/timer.h>
+#include <linux/kthread.h>
+
+
+#include "cluster/heartbeat.h"
+#include "cluster/nodemanager.h"
+#include "cluster/tcp.h"
+
+#include "dlmapi.h"
+#include "dlmcommon.h"
+#include "dlmdomain.h"
+
+#define MLOG_MASK_PREFIX (ML_DLM|ML_DLM_THREAD)
+#include "cluster/masklog.h"
+
+extern spinlock_t dlm_domain_lock;
+extern struct list_head dlm_domains;
+
+static int dlm_thread(void *data);
+
+static void dlm_flush_asts(struct dlm_ctxt *dlm);
+
+#define dlm_lock_is_remote(dlm, lock) ((lock)->ml.node != (dlm)->node_num)
+
+/* will exit holding res->spinlock, but may drop in function */
+/* waits until flags are cleared on res->state */
+void __dlm_wait_on_lockres_flags(struct dlm_lock_resource *res, int flags)
+{
+ DECLARE_WAITQUEUE(wait, current);
+
+ assert_spin_locked(&res->spinlock);
+
+ add_wait_queue(&res->wq, &wait);
+repeat:
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ if (res->state & flags) {
+ spin_unlock(&res->spinlock);
+ schedule();
+ spin_lock(&res->spinlock);
+ goto repeat;
+ }
+ remove_wait_queue(&res->wq, &wait);
+ current->state = TASK_RUNNING;
+}
+
+
+static int __dlm_lockres_unused(struct dlm_lock_resource *res)
+{
+ if (list_empty(&res->granted) &&
+ list_empty(&res->converting) &&
+ list_empty(&res->blocked) &&
+ list_empty(&res->dirty))
+ return 1;
+ return 0;
+}
+
+
+/* Call whenever you may have added or deleted something from one of
+ * the lockres queue's. This will figure out whether it belongs on the
+ * unused list or not and does the appropriate thing. */
+void __dlm_lockres_calc_usage(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res)
+{
+ mlog_entry("%.*s\n", res->lockname.len, res->lockname.name);
+
+ assert_spin_locked(&dlm->spinlock);
+ assert_spin_locked(&res->spinlock);
+
+ if (__dlm_lockres_unused(res)){
+ if (list_empty(&res->purge)) {
+ mlog(0, "putting lockres %.*s from purge list\n",
+ res->lockname.len, res->lockname.name);
+
+ res->last_used = jiffies;
+ list_add_tail(&res->purge, &dlm->purge_list);
+ dlm->purge_count++;
+ }
+ } else if (!list_empty(&res->purge)) {
+ mlog(0, "removing lockres %.*s from purge list\n",
+ res->lockname.len, res->lockname.name);
+
+ list_del_init(&res->purge);
+ dlm->purge_count--;
+ }
+}
+
+void dlm_lockres_calc_usage(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res)
+{
+ mlog_entry("%.*s\n", res->lockname.len, res->lockname.name);
+ spin_lock(&dlm->spinlock);
+ spin_lock(&res->spinlock);
+
+ __dlm_lockres_calc_usage(dlm, res);
+
+ spin_unlock(&res->spinlock);
+ spin_unlock(&dlm->spinlock);
+}
+
+/* TODO: Eventual API: Called with the dlm spinlock held, may drop it
+ * to do migration, but will re-acquire before exit. */
+void dlm_purge_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *lockres)
+{
+ int master;
+ int ret;
+
+ spin_lock(&lockres->spinlock);
+ master = lockres->owner == dlm->node_num;
+ spin_unlock(&lockres->spinlock);
+
+ mlog(0, "purging lockres %.*s, master = %d\n", lockres->lockname.len,
+ lockres->lockname.name, master);
+
+ /* Non master is the easy case -- no migration required, just
+ * quit. */
+ if (!master)
+ goto finish;
+
+ /* Wheee! Migrate lockres here! */
+ spin_unlock(&dlm->spinlock);
+again:
+
+ ret = dlm_migrate_lockres(dlm, lockres, O2NM_MAX_NODES);
+ if (ret == -ENOTEMPTY) {
+ mlog(ML_ERROR, "lockres %.*s still has local locks!\n",
+ lockres->lockname.len, lockres->lockname.name);
+
+ BUG();
+ } else if (ret < 0) {
+ mlog(ML_NOTICE, "lockres %.*s: migrate failed, retrying\n",
+ lockres->lockname.len, lockres->lockname.name);
+ goto again;
+ }
+
+ spin_lock(&dlm->spinlock);
+
+finish:
+ if (!list_empty(&lockres->purge)) {
+ list_del_init(&lockres->purge);
+ dlm->purge_count--;
+ }
+ __dlm_unhash_lockres(lockres);
+}
+
+static void dlm_run_purge_list(struct dlm_ctxt *dlm,
+ int purge_now)
+{
+ unsigned int run_max, unused;
+ unsigned long purge_jiffies;
+ struct dlm_lock_resource *lockres;
+
+ spin_lock(&dlm->spinlock);
+ run_max = dlm->purge_count;
+
+ while(run_max && !list_empty(&dlm->purge_list)) {
+ run_max--;
+
+ lockres = list_entry(dlm->purge_list.next,
+ struct dlm_lock_resource, purge);
+
+ /* Status of the lockres *might* change so double
+ * check. If the lockres is unused, holding the dlm
+ * spinlock will prevent people from getting and more
+ * refs on it -- there's no need to keep the lockres
+ * spinlock. */
+ spin_lock(&lockres->spinlock);
+ unused = __dlm_lockres_unused(lockres);
+ spin_unlock(&lockres->spinlock);
+
+ if (!unused)
+ continue;
+
+ purge_jiffies = lockres->last_used +
+ msecs_to_jiffies(DLM_PURGE_INTERVAL_MS);
+
+ /* Make sure that we want to be processing this guy at
+ * this time. */
+ if (!purge_now && time_after(purge_jiffies, jiffies)) {
+ /* Since resources are added to the purge list
+ * in tail order, we can stop at the first
+ * unpurgable resource -- anyone added after
+ * him will have a greater last_used value */
+ break;
+ }
+
+ list_del_init(&lockres->purge);
+ dlm->purge_count--;
+
+ /* This may drop and reacquire the dlm spinlock if it
+ * has to do migration. */
+ mlog(0, "calling dlm_purge_lockres!\n");
+ dlm_purge_lockres(dlm, lockres);
+ mlog(0, "DONE calling dlm_purge_lockres!\n");
+
+ /* Avoid adding any scheduling latencies */
+ cond_resched_lock(&dlm->spinlock);
+ }
+
+ spin_unlock(&dlm->spinlock);
+}
+
+static void dlm_shuffle_lists(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res)
+{
+ struct dlm_lock *lock, *target;
+ struct list_head *iter;
+ struct list_head *head;
+ int can_grant = 1;
+
+ //mlog(0, "res->lockname.len=%d\n", res->lockname.len);
+ //mlog(0, "res->lockname.name=%p\n", res->lockname.name);
+ //mlog(0, "shuffle res %.*s\n", res->lockname.len,
+ // res->lockname.name);
+
+ /* because this function is called with the lockres
+ * spinlock, and because we know that it is not migrating/
+ * recovering/in-progress, it is fine to reserve asts and
+ * basts right before queueing them all throughout */
+ assert_spin_locked(&res->spinlock);
+ BUG_ON((res->state & (DLM_LOCK_RES_MIGRATING|
+ DLM_LOCK_RES_RECOVERING|
+ DLM_LOCK_RES_IN_PROGRESS)));
+
+converting:
+ if (list_empty(&res->converting))
+ goto blocked;
+ mlog(0, "res %.*s has locks on a convert queue\n", res->lockname.len,
+ res->lockname.name);
+
+ target = list_entry(res->converting.next, struct dlm_lock, list);
+ if (target->ml.convert_type == LKM_IVMODE) {
+ mlog(ML_ERROR, "%.*s: converting a lock with no "
+ "convert_type!\n", res->lockname.len, res->lockname.name);
+ BUG();
+ }
+ head = &res->granted;
+ list_for_each(iter, head) {
+ lock = list_entry(iter, struct dlm_lock, list);
+ if (lock==target)
+ continue;
+ if (!dlm_lock_compatible(lock->ml.type,
+ target->ml.convert_type)) {
+ can_grant = 0;
+ /* queue the BAST if not already */
+ if (lock->ml.highest_blocked == LKM_IVMODE) {
+ __dlm_lockres_reserve_ast(res);
+ dlm_queue_bast(dlm, lock);
+ }
+ /* update the highest_blocked if needed */
+ if (lock->ml.highest_blocked < target->ml.convert_type)
+ lock->ml.highest_blocked =
+ target->ml.convert_type;
+ }
+ }
+ head = &res->converting;
+ list_for_each(iter, head) {
+ lock = list_entry(iter, struct dlm_lock, list);
+ if (lock==target)
+ continue;
+ if (!dlm_lock_compatible(lock->ml.type,
+ target->ml.convert_type)) {
+ can_grant = 0;
+ if (lock->ml.highest_blocked == LKM_IVMODE) {
+ __dlm_lockres_reserve_ast(res);
+ dlm_queue_bast(dlm, lock);
+ }
+ if (lock->ml.highest_blocked < target->ml.convert_type)
+ lock->ml.highest_blocked =
+ target->ml.convert_type;
+ }
+ }
+
+ /* we can convert the lock */
+ if (can_grant) {
+ spin_lock(&target->spinlock);
+ BUG_ON(target->ml.highest_blocked != LKM_IVMODE);
+
+ mlog(0, "calling ast for converting lock: %.*s, have: %d, "
+ "granting: %d, node: %u\n", res->lockname.len,
+ res->lockname.name, target->ml.type,
+ target->ml.convert_type, target->ml.node);
+
+ target->ml.type = target->ml.convert_type;
+ target->ml.convert_type = LKM_IVMODE;
+ list_del_init(&target->list);
+ list_add_tail(&target->list, &res->granted);
+
+ BUG_ON(!target->lksb);
+ target->lksb->status = DLM_NORMAL;
+
+ spin_unlock(&target->spinlock);
+
+ __dlm_lockres_reserve_ast(res);
+ dlm_queue_ast(dlm, target);
+ /* go back and check for more */
+ goto converting;
+ }
+
+blocked:
+ if (list_empty(&res->blocked))
+ goto leave;
+ target = list_entry(res->blocked.next, struct dlm_lock, list);
+
+ head = &res->granted;
+ list_for_each(iter, head) {
+ lock = list_entry(iter, struct dlm_lock, list);
+ if (lock==target)
+ continue;
+ if (!dlm_lock_compatible(lock->ml.type, target->ml.type)) {
+ can_grant = 0;
+ if (lock->ml.highest_blocked == LKM_IVMODE) {
+ __dlm_lockres_reserve_ast(res);
+ dlm_queue_bast(dlm, lock);
+ }
+ if (lock->ml.highest_blocked < target->ml.type)
+ lock->ml.highest_blocked = target->ml.type;
+ }
+ }
+
+ head = &res->converting;
+ list_for_each(iter, head) {
+ lock = list_entry(iter, struct dlm_lock, list);
+ if (lock==target)
+ continue;
+ if (!dlm_lock_compatible(lock->ml.type, target->ml.type)) {
+ can_grant = 0;
+ if (lock->ml.highest_blocked == LKM_IVMODE) {
+ __dlm_lockres_reserve_ast(res);
+ dlm_queue_bast(dlm, lock);
+ }
+ if (lock->ml.highest_blocked < target->ml.type)
+ lock->ml.highest_blocked = target->ml.type;
+ }
+ }
+
+ /* we can grant the blocked lock (only
+ * possible if converting list empty) */
+ if (can_grant) {
+ spin_lock(&target->spinlock);
+ BUG_ON(target->ml.highest_blocked != LKM_IVMODE);
+
+ mlog(0, "calling ast for blocked lock: %.*s, granting: %d, "
+ "node: %u\n", res->lockname.len, res->lockname.name,
+ target->ml.type, target->ml.node);
+
+ // target->ml.type is already correct
+ list_del_init(&target->list);
+ list_add_tail(&target->list, &res->granted);
+
+ BUG_ON(!target->lksb);
+ target->lksb->status = DLM_NORMAL;
+
+ spin_unlock(&target->spinlock);
+
+ __dlm_lockres_reserve_ast(res);
+ dlm_queue_ast(dlm, target);
+ /* go back and check for more */
+ goto converting;
+ }
+
+leave:
+ return;
+}
+
+/* must have NO locks when calling this with res !=NULL * */
+void dlm_kick_thread(struct dlm_ctxt *dlm, struct dlm_lock_resource *res)
+{
+ mlog_entry("dlm=%p, res=%p\n", dlm, res);
+ if (res) {
+ spin_lock(&dlm->spinlock);
+ spin_lock(&res->spinlock);
+ __dlm_dirty_lockres(dlm, res);
+ spin_unlock(&res->spinlock);
+ spin_unlock(&dlm->spinlock);
+ }
+ wake_up(&dlm->dlm_thread_wq);
+}
+
+void __dlm_dirty_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *res)
+{
+ mlog_entry("dlm=%p, res=%p\n", dlm, res);
+
+ assert_spin_locked(&dlm->spinlock);
+ assert_spin_locked(&res->spinlock);
+
+ /* don't shuffle secondary queues */
+ if ((res->owner == dlm->node_num) &&
+ !(res->state & DLM_LOCK_RES_DIRTY)) {
+ list_add_tail(&res->dirty, &dlm->dirty_list);
+ res->state |= DLM_LOCK_RES_DIRTY;
+ }
+}
+
+
+/* Launch the NM thread for the mounted volume */
+int dlm_launch_thread(struct dlm_ctxt *dlm)
+{
+ mlog(0, "starting dlm thread...\n");
+
+ dlm->dlm_thread_task = kthread_run(dlm_thread, dlm, "dlm_thread");
+ if (IS_ERR(dlm->dlm_thread_task)) {
+ mlog_errno(PTR_ERR(dlm->dlm_thread_task));
+ dlm->dlm_thread_task = NULL;
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+void dlm_complete_thread(struct dlm_ctxt *dlm)
+{
+ if (dlm->dlm_thread_task) {
+ mlog(ML_KTHREAD, "waiting for dlm thread to exit\n");
+ kthread_stop(dlm->dlm_thread_task);
+ dlm->dlm_thread_task = NULL;
+ }
+}
+
+static int dlm_dirty_list_empty(struct dlm_ctxt *dlm)
+{
+ int empty;
+
+ spin_lock(&dlm->spinlock);
+ empty = list_empty(&dlm->dirty_list);
+ spin_unlock(&dlm->spinlock);
+
+ return empty;
+}
+
+static void dlm_flush_asts(struct dlm_ctxt *dlm)
+{
+ int ret;
+ struct dlm_lock *lock;
+ struct dlm_lock_resource *res;
+ u8 hi;
+
+ spin_lock(&dlm->ast_lock);
+ while (!list_empty(&dlm->pending_asts)) {
+ lock = list_entry(dlm->pending_asts.next,
+ struct dlm_lock, ast_list);
+ /* get an extra ref on lock */
+ dlm_lock_get(lock);
+ res = lock->lockres;
+ mlog(0, "delivering an ast for this lockres\n");
+
+ BUG_ON(!lock->ast_pending);
+
+ /* remove from list (including ref) */
+ list_del_init(&lock->ast_list);
+ dlm_lock_put(lock);
+ spin_unlock(&dlm->ast_lock);
+
+ if (lock->ml.node != dlm->node_num) {
+ ret = dlm_do_remote_ast(dlm, res, lock);
+ if (ret < 0)
+ mlog_errno(ret);
+ } else
+ dlm_do_local_ast(dlm, res, lock);
+
+ spin_lock(&dlm->ast_lock);
+
+ /* possible that another ast was queued while
+ * we were delivering the last one */
+ if (!list_empty(&lock->ast_list)) {
+ mlog(0, "aha another ast got queued while "
+ "we were finishing the last one. will "
+ "keep the ast_pending flag set.\n");
+ } else
+ lock->ast_pending = 0;
+
+ /* drop the extra ref.
+ * this may drop it completely. */
+ dlm_lock_put(lock);
+ dlm_lockres_release_ast(dlm, res);
+ }
+
+ while (!list_empty(&dlm->pending_basts)) {
+ lock = list_entry(dlm->pending_basts.next,
+ struct dlm_lock, bast_list);
+ /* get an extra ref on lock */
+ dlm_lock_get(lock);
+ res = lock->lockres;
+
+ BUG_ON(!lock->bast_pending);
+
+ /* get the highest blocked lock, and reset */
+ spin_lock(&lock->spinlock);
+ BUG_ON(lock->ml.highest_blocked <= LKM_IVMODE);
+ hi = lock->ml.highest_blocked;
+ lock->ml.highest_blocked = LKM_IVMODE;
+ spin_unlock(&lock->spinlock);
+
+ /* remove from list (including ref) */
+ list_del_init(&lock->bast_list);
+ dlm_lock_put(lock);
+ spin_unlock(&dlm->ast_lock);
+
+ mlog(0, "delivering a bast for this lockres "
+ "(blocked = %d\n", hi);
+
+ if (lock->ml.node != dlm->node_num) {
+ ret = dlm_send_proxy_bast(dlm, res, lock, hi);
+ if (ret < 0)
+ mlog_errno(ret);
+ } else
+ dlm_do_local_bast(dlm, res, lock, hi);
+
+ spin_lock(&dlm->ast_lock);
+
+ /* possible that another bast was queued while
+ * we were delivering the last one */
+ if (!list_empty(&lock->bast_list)) {
+ mlog(0, "aha another bast got queued while "
+ "we were finishing the last one. will "
+ "keep the bast_pending flag set.\n");
+ } else
+ lock->bast_pending = 0;
+
+ /* drop the extra ref.
+ * this may drop it completely. */
+ dlm_lock_put(lock);
+ dlm_lockres_release_ast(dlm, res);
+ }
+ wake_up(&dlm->ast_wq);
+ spin_unlock(&dlm->ast_lock);
+}
+
+
+#define DLM_THREAD_TIMEOUT_MS (4 * 1000)
+#define DLM_THREAD_MAX_DIRTY 100
+#define DLM_THREAD_MAX_ASTS 10
+
+static int dlm_thread(void *data)
+{
+ struct dlm_lock_resource *res;
+ struct dlm_ctxt *dlm = data;
+ unsigned long timeout = msecs_to_jiffies(DLM_THREAD_TIMEOUT_MS);
+
+ mlog(0, "dlm thread running for %s...\n", dlm->name);
+
+ while (!kthread_should_stop()) {
+ int n = DLM_THREAD_MAX_DIRTY;
+
+ /* dlm_shutting_down is very point-in-time, but that
+ * doesn't matter as we'll just loop back around if we
+ * get false on the leading edge of a state
+ * transition. */
+ dlm_run_purge_list(dlm, dlm_shutting_down(dlm));
+
+ /* We really don't want to hold dlm->spinlock while
+ * calling dlm_shuffle_lists on each lockres that
+ * needs to have its queues adjusted and AST/BASTs
+ * run. So let's pull each entry off the dirty_list
+ * and drop dlm->spinlock ASAP. Once off the list,
+ * res->spinlock needs to be taken again to protect
+ * the queues while calling dlm_shuffle_lists. */
+ spin_lock(&dlm->spinlock);
+ while (!list_empty(&dlm->dirty_list)) {
+ int delay = 0;
+ res = list_entry(dlm->dirty_list.next,
+ struct dlm_lock_resource, dirty);
+
+ /* peel a lockres off, remove it from the list,
+ * unset the dirty flag and drop the dlm lock */
+ BUG_ON(!res);
+ dlm_lockres_get(res);
+
+ spin_lock(&res->spinlock);
+ res->state &= ~DLM_LOCK_RES_DIRTY;
+ list_del_init(&res->dirty);
+ spin_unlock(&res->spinlock);
+ spin_unlock(&dlm->spinlock);
+
+ /* lockres can be re-dirtied/re-added to the
+ * dirty_list in this gap, but that is ok */
+
+ spin_lock(&res->spinlock);
+ if (res->owner != dlm->node_num) {
+ __dlm_print_one_lock_resource(res);
+ mlog(ML_ERROR, "inprog:%s, mig:%s, reco:%s, dirty:%s\n",
+ res->state & DLM_LOCK_RES_IN_PROGRESS ? "yes" : "no",
+ res->state & DLM_LOCK_RES_MIGRATING ? "yes" : "no",
+ res->state & DLM_LOCK_RES_RECOVERING ? "yes" : "no",
+ res->state & DLM_LOCK_RES_DIRTY ? "yes" : "no");
+ }
+ BUG_ON(res->owner != dlm->node_num);
+
+ /* it is now ok to move lockreses in these states
+ * to the dirty list, assuming that they will only be
+ * dirty for a short while. */
+ if (res->state & (DLM_LOCK_RES_IN_PROGRESS |
+ DLM_LOCK_RES_MIGRATING |
+ DLM_LOCK_RES_RECOVERING)) {
+ /* move it to the tail and keep going */
+ spin_unlock(&res->spinlock);
+ mlog(0, "delaying list shuffling for in-"
+ "progress lockres %.*s, state=%d\n",
+ res->lockname.len, res->lockname.name,
+ res->state);
+ delay = 1;
+ goto in_progress;
+ }
+
+ /* at this point the lockres is not migrating/
+ * recovering/in-progress. we have the lockres
+ * spinlock and do NOT have the dlm lock.
+ * safe to reserve/queue asts and run the lists. */
+
+ mlog(0, "calling dlm_shuffle_lists with dlm=%p, "
+ "res=%p\n", dlm, res);
+
+ /* called while holding lockres lock */
+ dlm_shuffle_lists(dlm, res);
+ spin_unlock(&res->spinlock);
+
+ dlm_lockres_calc_usage(dlm, res);
+
+in_progress:
+
+ spin_lock(&dlm->spinlock);
+ /* if the lock was in-progress, stick
+ * it on the back of the list */
+ if (delay) {
+ spin_lock(&res->spinlock);
+ list_add_tail(&res->dirty, &dlm->dirty_list);
+ res->state |= DLM_LOCK_RES_DIRTY;
+ spin_unlock(&res->spinlock);
+ }
+ dlm_lockres_put(res);
+
+ /* unlikely, but we may need to give time to
+ * other tasks */
+ if (!--n) {
+ mlog(0, "throttling dlm_thread\n");
+ break;
+ }
+ }
+
+ spin_unlock(&dlm->spinlock);
+ dlm_flush_asts(dlm);
+
+ /* yield and continue right away if there is more work to do */
+ if (!n) {
+ yield();
+ continue;
+ }
+
+ wait_event_interruptible_timeout(dlm->dlm_thread_wq,
+ !dlm_dirty_list_empty(dlm) ||
+ kthread_should_stop(),
+ timeout);
+ }
+
+ mlog(0, "quitting DLM thread\n");
+ return 0;
+}
--- /dev/null
+/* -*- mode: c; c-basic-offset: 8; -*-
+ * vim: noexpandtab sw=8 ts=8 sts=0:
+ *
+ * dlmunlock.c
+ *
+ * underlying calls for unlocking locks
+ *
+ * Copyright (C) 2004 Oracle. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ *
+ */
+
+
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/highmem.h>
+#include <linux/utsname.h>
+#include <linux/init.h>
+#include <linux/sysctl.h>
+#include <linux/random.h>
+#include <linux/blkdev.h>
+#include <linux/socket.h>
+#include <linux/inet.h>
+#include <linux/spinlock.h>
+#include <linux/delay.h>
+
+#include "cluster/heartbeat.h"
+#include "cluster/nodemanager.h"
+#include "cluster/tcp.h"
+
+#include "dlmapi.h"
+#include "dlmcommon.h"
+
+#define MLOG_MASK_PREFIX ML_DLM
+#include "cluster/masklog.h"
+
+#define DLM_UNLOCK_FREE_LOCK 0x00000001
+#define DLM_UNLOCK_CALL_AST 0x00000002
+#define DLM_UNLOCK_REMOVE_LOCK 0x00000004
+#define DLM_UNLOCK_REGRANT_LOCK 0x00000008
+#define DLM_UNLOCK_CLEAR_CONVERT_TYPE 0x00000010
+
+
+static enum dlm_status dlm_get_cancel_actions(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res,
+ struct dlm_lock *lock,
+ struct dlm_lockstatus *lksb,
+ int *actions);
+static enum dlm_status dlm_get_unlock_actions(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res,
+ struct dlm_lock *lock,
+ struct dlm_lockstatus *lksb,
+ int *actions);
+
+static enum dlm_status dlm_send_remote_unlock_request(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res,
+ struct dlm_lock *lock,
+ struct dlm_lockstatus *lksb,
+ int flags,
+ u8 owner);
+
+
+/*
+ * according to the spec:
+ * http://opendlm.sourceforge.net/cvsmirror/opendlm/docs/dlmbook_final.pdf
+ *
+ * flags & LKM_CANCEL != 0: must be converting or blocked
+ * flags & LKM_CANCEL == 0: must be granted
+ *
+ * So to unlock a converting lock, you must first cancel the
+ * convert (passing LKM_CANCEL in flags), then call the unlock
+ * again (with no LKM_CANCEL in flags).
+ */
+
+
+/*
+ * locking:
+ * caller needs: none
+ * taken: res->spinlock and lock->spinlock taken and dropped
+ * held on exit: none
+ * returns: DLM_NORMAL, DLM_NOLOCKMGR, status from network
+ * all callers should have taken an extra ref on lock coming in
+ */
+static enum dlm_status dlmunlock_common(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res,
+ struct dlm_lock *lock,
+ struct dlm_lockstatus *lksb,
+ int flags, int *call_ast,
+ int master_node)
+{
+ enum dlm_status status;
+ int actions = 0;
+ int in_use;
+ u8 owner;
+
+ mlog(0, "master_node = %d, valblk = %d\n", master_node,
+ flags & LKM_VALBLK);
+
+ if (master_node)
+ BUG_ON(res->owner != dlm->node_num);
+ else
+ BUG_ON(res->owner == dlm->node_num);
+
+ spin_lock(&dlm->spinlock);
+ /* We want to be sure that we're not freeing a lock
+ * that still has AST's pending... */
+ in_use = !list_empty(&lock->ast_list);
+ spin_unlock(&dlm->spinlock);
+ if (in_use) {
+ mlog(ML_ERROR, "lockres %.*s: Someone is calling dlmunlock "
+ "while waiting for an ast!", res->lockname.len,
+ res->lockname.name);
+ return DLM_BADPARAM;
+ }
+
+ spin_lock(&res->spinlock);
+ if (res->state & DLM_LOCK_RES_IN_PROGRESS) {
+ if (master_node) {
+ mlog(ML_ERROR, "lockres in progress!\n");
+ spin_unlock(&res->spinlock);
+ return DLM_FORWARD;
+ }
+ /* ok for this to sleep if not in a network handler */
+ __dlm_wait_on_lockres(res);
+ res->state |= DLM_LOCK_RES_IN_PROGRESS;
+ }
+ spin_lock(&lock->spinlock);
+
+ if (res->state & DLM_LOCK_RES_RECOVERING) {
+ status = DLM_RECOVERING;
+ goto leave;
+ }
+
+
+ /* see above for what the spec says about
+ * LKM_CANCEL and the lock queue state */
+ if (flags & LKM_CANCEL)
+ status = dlm_get_cancel_actions(dlm, res, lock, lksb, &actions);
+ else
+ status = dlm_get_unlock_actions(dlm, res, lock, lksb, &actions);
+
+ if (status != DLM_NORMAL)
+ goto leave;
+
+ /* By now this has been masked out of cancel requests. */
+ if (flags & LKM_VALBLK) {
+ /* make the final update to the lvb */
+ if (master_node)
+ memcpy(res->lvb, lksb->lvb, DLM_LVB_LEN);
+ else
+ flags |= LKM_PUT_LVB; /* let the send function
+ * handle it. */
+ }
+
+ if (!master_node) {
+ owner = res->owner;
+ /* drop locks and send message */
+ if (flags & LKM_CANCEL)
+ lock->cancel_pending = 1;
+ else
+ lock->unlock_pending = 1;
+ spin_unlock(&lock->spinlock);
+ spin_unlock(&res->spinlock);
+ status = dlm_send_remote_unlock_request(dlm, res, lock, lksb,
+ flags, owner);
+ spin_lock(&res->spinlock);
+ spin_lock(&lock->spinlock);
+ /* if the master told us the lock was already granted,
+ * let the ast handle all of these actions */
+ if (status == DLM_NORMAL &&
+ lksb->status == DLM_CANCELGRANT) {
+ actions &= ~(DLM_UNLOCK_REMOVE_LOCK|
+ DLM_UNLOCK_REGRANT_LOCK|
+ DLM_UNLOCK_CLEAR_CONVERT_TYPE);
+ }
+ if (flags & LKM_CANCEL)
+ lock->cancel_pending = 0;
+ else
+ lock->unlock_pending = 0;
+
+ }
+
+ /* get an extra ref on lock. if we are just switching
+ * lists here, we dont want the lock to go away. */
+ dlm_lock_get(lock);
+
+ if (actions & DLM_UNLOCK_REMOVE_LOCK) {
+ list_del_init(&lock->list);
+ dlm_lock_put(lock);
+ }
+ if (actions & DLM_UNLOCK_REGRANT_LOCK) {
+ dlm_lock_get(lock);
+ list_add_tail(&lock->list, &res->granted);
+ }
+ if (actions & DLM_UNLOCK_CLEAR_CONVERT_TYPE) {
+ mlog(0, "clearing convert_type at %smaster node\n",
+ master_node ? "" : "non-");
+ lock->ml.convert_type = LKM_IVMODE;
+ }
+
+ /* remove the extra ref on lock */
+ dlm_lock_put(lock);
+
+leave:
+ res->state &= ~DLM_LOCK_RES_IN_PROGRESS;
+ if (!dlm_lock_on_list(&res->converting, lock))
+ BUG_ON(lock->ml.convert_type != LKM_IVMODE);
+ else
+ BUG_ON(lock->ml.convert_type == LKM_IVMODE);
+ spin_unlock(&lock->spinlock);
+ spin_unlock(&res->spinlock);
+ wake_up(&res->wq);
+
+ /* let the caller's final dlm_lock_put handle the actual kfree */
+ if (actions & DLM_UNLOCK_FREE_LOCK) {
+ /* this should always be coupled with list removal */
+ BUG_ON(!(actions & DLM_UNLOCK_REMOVE_LOCK));
+ mlog(0, "lock %"MLFu64" should be gone now! refs=%d\n",
+ lock->ml.cookie, atomic_read(&lock->lock_refs.refcount)-1);
+ dlm_lock_put(lock);
+ }
+ if (actions & DLM_UNLOCK_CALL_AST)
+ *call_ast = 1;
+
+ /* if cancel or unlock succeeded, lvb work is done */
+ if (status == DLM_NORMAL)
+ lksb->flags &= ~(DLM_LKSB_PUT_LVB|DLM_LKSB_GET_LVB);
+
+ return status;
+}
+
+void dlm_commit_pending_unlock(struct dlm_lock_resource *res,
+ struct dlm_lock *lock)
+{
+ /* leave DLM_LKSB_PUT_LVB on the lksb so any final
+ * update of the lvb will be sent to the new master */
+ list_del_init(&lock->list);
+}
+
+void dlm_commit_pending_cancel(struct dlm_lock_resource *res,
+ struct dlm_lock *lock)
+{
+ list_del_init(&lock->list);
+ list_add_tail(&lock->list, &res->granted);
+ lock->ml.convert_type = LKM_IVMODE;
+}
+
+
+static inline enum dlm_status dlmunlock_master(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res,
+ struct dlm_lock *lock,
+ struct dlm_lockstatus *lksb,
+ int flags,
+ int *call_ast)
+{
+ return dlmunlock_common(dlm, res, lock, lksb, flags, call_ast, 1);
+}
+
+static inline enum dlm_status dlmunlock_remote(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res,
+ struct dlm_lock *lock,
+ struct dlm_lockstatus *lksb,
+ int flags, int *call_ast)
+{
+ return dlmunlock_common(dlm, res, lock, lksb, flags, call_ast, 0);
+}
+
+/*
+ * locking:
+ * caller needs: none
+ * taken: none
+ * held on exit: none
+ * returns: DLM_NORMAL, DLM_NOLOCKMGR, status from network
+ */
+static enum dlm_status dlm_send_remote_unlock_request(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res,
+ struct dlm_lock *lock,
+ struct dlm_lockstatus *lksb,
+ int flags,
+ u8 owner)
+{
+ struct dlm_unlock_lock unlock;
+ int tmpret;
+ enum dlm_status ret;
+ int status = 0;
+ struct kvec vec[2];
+ size_t veclen = 1;
+
+ mlog_entry("%.*s\n", res->lockname.len, res->lockname.name);
+
+ memset(&unlock, 0, sizeof(unlock));
+ unlock.node_idx = dlm->node_num;
+ unlock.flags = cpu_to_be32(flags);
+ unlock.cookie = lock->ml.cookie;
+ unlock.namelen = res->lockname.len;
+ memcpy(unlock.name, res->lockname.name, unlock.namelen);
+
+ vec[0].iov_len = sizeof(struct dlm_unlock_lock);
+ vec[0].iov_base = &unlock;
+
+ if (flags & LKM_PUT_LVB) {
+ /* extra data to send if we are updating lvb */
+ vec[1].iov_len = DLM_LVB_LEN;
+ vec[1].iov_base = lock->lksb->lvb;
+ veclen++;
+ }
+
+ tmpret = o2net_send_message_vec(DLM_UNLOCK_LOCK_MSG, dlm->key,
+ vec, veclen, owner, &status);
+ if (tmpret >= 0) {
+ // successfully sent and received
+ if (status == DLM_CANCELGRANT)
+ ret = DLM_NORMAL;
+ else if (status == DLM_FORWARD) {
+ mlog(0, "master was in-progress. retry\n");
+ ret = DLM_FORWARD;
+ } else
+ ret = status;
+ lksb->status = status;
+ } else {
+ mlog_errno(tmpret);
+ if (dlm_is_host_down(tmpret)) {
+ /* NOTE: this seems strange, but it is what we want.
+ * when the master goes down during a cancel or
+ * unlock, the recovery code completes the operation
+ * as if the master had not died, then passes the
+ * updated state to the recovery master. this thread
+ * just needs to finish out the operation and call
+ * the unlockast. */
+ ret = DLM_NORMAL;
+ } else {
+ /* something bad. this will BUG in ocfs2 */
+ ret = dlm_err_to_dlm_status(tmpret);
+ }
+ lksb->status = ret;
+ }
+
+ return ret;
+}
+
+/*
+ * locking:
+ * caller needs: none
+ * taken: takes and drops res->spinlock
+ * held on exit: none
+ * returns: DLM_NORMAL, DLM_BADARGS, DLM_IVLOCKID,
+ * return value from dlmunlock_master
+ */
+int dlm_unlock_lock_handler(struct o2net_msg *msg, u32 len, void *data)
+{
+ struct dlm_ctxt *dlm = data;
+ struct dlm_unlock_lock *unlock = (struct dlm_unlock_lock *)msg->buf;
+ struct dlm_lock_resource *res = NULL;
+ struct list_head *iter;
+ struct dlm_lock *lock = NULL;
+ enum dlm_status status = DLM_NORMAL;
+ int found = 0, i;
+ struct dlm_lockstatus *lksb = NULL;
+ int ignore;
+ u32 flags;
+ struct list_head *queue;
+
+ flags = be32_to_cpu(unlock->flags);
+
+ if (flags & LKM_GET_LVB) {
+ mlog(ML_ERROR, "bad args! GET_LVB specified on unlock!\n");
+ return DLM_BADARGS;
+ }
+
+ if ((flags & (LKM_PUT_LVB|LKM_CANCEL)) == (LKM_PUT_LVB|LKM_CANCEL)) {
+ mlog(ML_ERROR, "bad args! cannot modify lvb on a CANCEL "
+ "request!\n");
+ return DLM_BADARGS;
+ }
+
+ if (unlock->namelen > DLM_LOCKID_NAME_MAX) {
+ mlog(ML_ERROR, "Invalid name length in unlock handler!\n");
+ return DLM_IVBUFLEN;
+ }
+
+ if (!dlm_grab(dlm))
+ return DLM_REJECTED;
+
+ mlog_bug_on_msg(!dlm_domain_fully_joined(dlm),
+ "Domain %s not fully joined!\n", dlm->name);
+
+ mlog(0, "lvb: %s\n", flags & LKM_PUT_LVB ? "put lvb" : "none");
+
+ res = dlm_lookup_lockres(dlm, unlock->name, unlock->namelen);
+ if (!res) {
+ /* We assume here that a no lock resource simply means
+ * it was migrated away and destroyed before the other
+ * node could detect it. */
+ mlog(0, "returning DLM_FORWARD -- res no longer exists\n");
+ status = DLM_FORWARD;
+ goto not_found;
+ }
+
+ queue=&res->granted;
+ found = 0;
+ spin_lock(&res->spinlock);
+ if (res->state & DLM_LOCK_RES_RECOVERING) {
+ spin_unlock(&res->spinlock);
+ mlog(0, "returning DLM_RECOVERING\n");
+ status = DLM_RECOVERING;
+ goto leave;
+ }
+
+ if (res->state & DLM_LOCK_RES_MIGRATING) {
+ spin_unlock(&res->spinlock);
+ mlog(0, "returning DLM_MIGRATING\n");
+ status = DLM_MIGRATING;
+ goto leave;
+ }
+
+ if (res->owner != dlm->node_num) {
+ spin_unlock(&res->spinlock);
+ mlog(0, "returning DLM_FORWARD -- not master\n");
+ status = DLM_FORWARD;
+ goto leave;
+ }
+
+ for (i=0; i<3; i++) {
+ list_for_each(iter, queue) {
+ lock = list_entry(iter, struct dlm_lock, list);
+ if (lock->ml.cookie == unlock->cookie &&
+ lock->ml.node == unlock->node_idx) {
+ dlm_lock_get(lock);
+ found = 1;
+ break;
+ }
+ }
+ if (found)
+ break;
+ /* scan granted -> converting -> blocked queues */
+ queue++;
+ }
+ spin_unlock(&res->spinlock);
+ if (!found) {
+ status = DLM_IVLOCKID;
+ goto not_found;
+ }
+
+ /* lock was found on queue */
+ lksb = lock->lksb;
+ /* unlockast only called on originating node */
+ if (flags & LKM_PUT_LVB) {
+ lksb->flags |= DLM_LKSB_PUT_LVB;
+ memcpy(&lksb->lvb[0], &unlock->lvb[0], DLM_LVB_LEN);
+ }
+
+ /* if this is in-progress, propagate the DLM_FORWARD
+ * all the way back out */
+ status = dlmunlock_master(dlm, res, lock, lksb, flags, &ignore);
+ if (status == DLM_FORWARD)
+ mlog(0, "lockres is in progress\n");
+
+ if (flags & LKM_PUT_LVB)
+ lksb->flags &= ~DLM_LKSB_PUT_LVB;
+
+ dlm_lockres_calc_usage(dlm, res);
+ dlm_kick_thread(dlm, res);
+
+not_found:
+ if (!found)
+ mlog(ML_ERROR, "failed to find lock to unlock! "
+ "cookie=%"MLFu64"\n",
+ unlock->cookie);
+ else {
+ /* send the lksb->status back to the other node */
+ status = lksb->status;
+ dlm_lock_put(lock);
+ }
+
+leave:
+ if (res)
+ dlm_lockres_put(res);
+
+ dlm_put(dlm);
+
+ return status;
+}
+
+
+static enum dlm_status dlm_get_cancel_actions(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res,
+ struct dlm_lock *lock,
+ struct dlm_lockstatus *lksb,
+ int *actions)
+{
+ enum dlm_status status;
+
+ if (dlm_lock_on_list(&res->blocked, lock)) {
+ /* cancel this outright */
+ lksb->status = DLM_NORMAL;
+ status = DLM_NORMAL;
+ *actions = (DLM_UNLOCK_CALL_AST |
+ DLM_UNLOCK_REMOVE_LOCK);
+ } else if (dlm_lock_on_list(&res->converting, lock)) {
+ /* cancel the request, put back on granted */
+ lksb->status = DLM_NORMAL;
+ status = DLM_NORMAL;
+ *actions = (DLM_UNLOCK_CALL_AST |
+ DLM_UNLOCK_REMOVE_LOCK |
+ DLM_UNLOCK_REGRANT_LOCK |
+ DLM_UNLOCK_CLEAR_CONVERT_TYPE);
+ } else if (dlm_lock_on_list(&res->granted, lock)) {
+ /* too late, already granted. DLM_CANCELGRANT */
+ lksb->status = DLM_CANCELGRANT;
+ status = DLM_NORMAL;
+ *actions = DLM_UNLOCK_CALL_AST;
+ } else {
+ mlog(ML_ERROR, "lock to cancel is not on any list!\n");
+ lksb->status = DLM_IVLOCKID;
+ status = DLM_IVLOCKID;
+ *actions = 0;
+ }
+ return status;
+}
+
+static enum dlm_status dlm_get_unlock_actions(struct dlm_ctxt *dlm,
+ struct dlm_lock_resource *res,
+ struct dlm_lock *lock,
+ struct dlm_lockstatus *lksb,
+ int *actions)
+{
+ enum dlm_status status;
+
+ /* unlock request */
+ if (!dlm_lock_on_list(&res->granted, lock)) {
+ lksb->status = DLM_DENIED;
+ status = DLM_DENIED;
+ dlm_error(status);
+ *actions = 0;
+ } else {
+ /* unlock granted lock */
+ lksb->status = DLM_NORMAL;
+ status = DLM_NORMAL;
+ *actions = (DLM_UNLOCK_FREE_LOCK |
+ DLM_UNLOCK_CALL_AST |
+ DLM_UNLOCK_REMOVE_LOCK);
+ }
+ return status;
+}
+
+/* there seems to be no point in doing this async
+ * since (even for the remote case) there is really
+ * no work to queue up... so just do it and fire the
+ * unlockast by hand when done... */
+enum dlm_status dlmunlock(struct dlm_ctxt *dlm, struct dlm_lockstatus *lksb,
+ int flags, dlm_astunlockfunc_t *unlockast, void *data)
+{
+ enum dlm_status status;
+ struct dlm_lock_resource *res;
+ struct dlm_lock *lock = NULL;
+ int call_ast, is_master;
+
+ mlog_entry_void();
+
+ if (!lksb) {
+ dlm_error(DLM_BADARGS);
+ return DLM_BADARGS;
+ }
+
+ if (flags & ~(LKM_CANCEL | LKM_VALBLK | LKM_INVVALBLK)) {
+ dlm_error(DLM_BADPARAM);
+ return DLM_BADPARAM;
+ }
+
+ if ((flags & (LKM_VALBLK | LKM_CANCEL)) == (LKM_VALBLK | LKM_CANCEL)) {
+ mlog(0, "VALBLK given with CANCEL: ignoring VALBLK\n");
+ flags &= ~LKM_VALBLK;
+ }
+
+ if (!lksb->lockid || !lksb->lockid->lockres) {
+ dlm_error(DLM_BADPARAM);
+ return DLM_BADPARAM;
+ }
+
+ lock = lksb->lockid;
+ BUG_ON(!lock);
+ dlm_lock_get(lock);
+
+ res = lock->lockres;
+ BUG_ON(!res);
+ dlm_lockres_get(res);
+retry:
+ call_ast = 0;
+ /* need to retry up here because owner may have changed */
+ mlog(0, "lock=%p res=%p\n", lock, res);
+
+ spin_lock(&res->spinlock);
+ is_master = (res->owner == dlm->node_num);
+ spin_unlock(&res->spinlock);
+
+ if (is_master) {
+ status = dlmunlock_master(dlm, res, lock, lksb, flags,
+ &call_ast);
+ mlog(0, "done calling dlmunlock_master: returned %d, "
+ "call_ast is %d\n", status, call_ast);
+ } else {
+ status = dlmunlock_remote(dlm, res, lock, lksb, flags,
+ &call_ast);
+ mlog(0, "done calling dlmunlock_remote: returned %d, "
+ "call_ast is %d\n", status, call_ast);
+ }
+
+ if (status == DLM_RECOVERING ||
+ status == DLM_MIGRATING ||
+ status == DLM_FORWARD) {
+ /* We want to go away for a tiny bit to allow recovery
+ * / migration to complete on this resource. I don't
+ * know of any wait queue we could sleep on as this
+ * may be happening on another node. Perhaps the
+ * proper solution is to queue up requests on the
+ * other end? */
+
+ /* do we want to yield(); ?? */
+ msleep(50);
+
+ mlog(0, "retrying unlock due to pending recovery/"
+ "migration/in-progress\n");
+ goto retry;
+ }
+
+ if (call_ast) {
+ mlog(0, "calling unlockast(%p, %d)\n", data, lksb->status);
+ if (is_master) {
+ /* it is possible that there is one last bast
+ * pending. make sure it is flushed, then
+ * call the unlockast.
+ * not an issue if this is a mastered remotely,
+ * since this lock has been removed from the
+ * lockres queues and cannot be found. */
+ dlm_kick_thread(dlm, NULL);
+ wait_event(dlm->ast_wq,
+ dlm_lock_basts_flushed(dlm, lock));
+ }
+ (*unlockast)(data, lksb->status);
+ }
+
+ if (status == DLM_NORMAL) {
+ mlog(0, "kicking the thread\n");
+ dlm_kick_thread(dlm, res);
+ } else
+ dlm_error(status);
+
+ dlm_lockres_calc_usage(dlm, res);
+ dlm_lockres_put(res);
+ dlm_lock_put(lock);
+
+ mlog(0, "returning status=%d!\n", status);
+ return status;
+}
+EXPORT_SYMBOL_GPL(dlmunlock);
+
--- /dev/null
+/* -*- mode: c; c-basic-offset: 8; -*-
+ * vim: noexpandtab sw=8 ts=8 sts=0:
+ *
+ * dlmver.c
+ *
+ * version string
+ *
+ * Copyright (C) 2002, 2005 Oracle. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+
+#include "dlmver.h"
+
+#define DLM_BUILD_VERSION "1.3.3"
+
+#define VERSION_STR "OCFS2 DLM " DLM_BUILD_VERSION
+
+void dlm_print_version(void)
+{
+ printk(KERN_INFO "%s\n", VERSION_STR);
+}
+
+MODULE_DESCRIPTION(VERSION_STR);
+
+MODULE_VERSION(DLM_BUILD_VERSION);
--- /dev/null
+/* -*- mode: c; c-basic-offset: 8; -*-
+ * vim: noexpandtab sw=8 ts=8 sts=0:
+ *
+ * dlmfsver.h
+ *
+ * Function prototypes
+ *
+ * Copyright (C) 2005 Oracle. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ */
+
+#ifndef DLM_VER_H
+#define DLM_VER_H
+
+void dlm_print_version(void);
+
+#endif /* DLM_VER_H */
projects / linux-2.6 / commitdiff