static void __receive_convert_reply(struct dlm_rsb *r, struct dlm_lkb *lkb,
struct dlm_message *ms);
static int receive_extralen(struct dlm_message *ms);
+static void do_purge(struct dlm_ls *ls, int nodeid, int pid);
/*
* Lock compatibilty matrix - thanks Steve
return (lkb->lkb_sbflags & DLM_SBF_DEMOTED);
}
+static inline int is_altmode(struct dlm_lkb *lkb)
+{
+ return (lkb->lkb_sbflags & DLM_SBF_ALTMODE);
+}
+
+static inline int is_granted(struct dlm_lkb *lkb)
+{
+ return (lkb->lkb_status == DLM_LKSTS_GRANTED);
+}
+
static inline int is_remote(struct dlm_rsb *r)
{
DLM_ASSERT(r->res_nodeid >= 0, dlm_print_rsb(r););
/* counter can roll over so we must verify lkid is not in use */
while (lkid == 0) {
- lkid = bucket | (ls->ls_lkbtbl[bucket].counter++ << 16);
+ lkid = (bucket << 16) | ls->ls_lkbtbl[bucket].counter++;
list_for_each_entry(tmp, &ls->ls_lkbtbl[bucket].list,
lkb_idtbl_list) {
static struct dlm_lkb *__find_lkb(struct dlm_ls *ls, uint32_t lkid)
{
- uint16_t bucket = lkid & 0xFFFF;
struct dlm_lkb *lkb;
+ uint16_t bucket = (lkid >> 16);
list_for_each_entry(lkb, &ls->ls_lkbtbl[bucket].list, lkb_idtbl_list) {
if (lkb->lkb_id == lkid)
static int find_lkb(struct dlm_ls *ls, uint32_t lkid, struct dlm_lkb **lkb_ret)
{
struct dlm_lkb *lkb;
- uint16_t bucket = lkid & 0xFFFF;
+ uint16_t bucket = (lkid >> 16);
if (bucket >= ls->ls_lkbtbl_size)
return -EBADSLT;
static int __put_lkb(struct dlm_ls *ls, struct dlm_lkb *lkb)
{
- uint16_t bucket = lkb->lkb_id & 0xFFFF;
+ uint16_t bucket = (lkb->lkb_id >> 16);
write_lock(&ls->ls_lkbtbl[bucket].lock);
if (kref_put(&lkb->lkb_ref, kill_lkb)) {
queue_cast(r, lkb, 0);
}
+/* The special CONVDEADLK, ALTPR and ALTCW flags allow the master to
+ change the granted/requested modes. We're munging things accordingly in
+ the process copy.
+ CONVDEADLK: our grmode may have been forced down to NL to resolve a
+ conversion deadlock
+ ALTPR/ALTCW: our rqmode may have been changed to PR or CW to become
+ compatible with other granted locks */
+
+static void munge_demoted(struct dlm_lkb *lkb, struct dlm_message *ms)
+{
+ if (ms->m_type != DLM_MSG_CONVERT_REPLY) {
+ log_print("munge_demoted %x invalid reply type %d",
+ lkb->lkb_id, ms->m_type);
+ return;
+ }
+
+ if (lkb->lkb_rqmode == DLM_LOCK_IV || lkb->lkb_grmode == DLM_LOCK_IV) {
+ log_print("munge_demoted %x invalid modes gr %d rq %d",
+ lkb->lkb_id, lkb->lkb_grmode, lkb->lkb_rqmode);
+ return;
+ }
+
+ lkb->lkb_grmode = DLM_LOCK_NL;
+}
+
+static void munge_altmode(struct dlm_lkb *lkb, struct dlm_message *ms)
+{
+ if (ms->m_type != DLM_MSG_REQUEST_REPLY &&
+ ms->m_type != DLM_MSG_GRANT) {
+ log_print("munge_altmode %x invalid reply type %d",
+ lkb->lkb_id, ms->m_type);
+ return;
+ }
+
+ if (lkb->lkb_exflags & DLM_LKF_ALTPR)
+ lkb->lkb_rqmode = DLM_LOCK_PR;
+ else if (lkb->lkb_exflags & DLM_LKF_ALTCW)
+ lkb->lkb_rqmode = DLM_LOCK_CW;
+ else {
+ log_print("munge_altmode invalid exflags %x", lkb->lkb_exflags);
+ dlm_print_lkb(lkb);
+ }
+}
+
static inline int first_in_list(struct dlm_lkb *lkb, struct list_head *head)
{
struct dlm_lkb *first = list_entry(head->next, struct dlm_lkb,
goto out;
}
- if (can_be_queued(lkb)) {
- if (is_demoted(lkb))
+ /* is_demoted() means the can_be_granted() above set the grmode
+ to NL, and left us on the granted queue. This auto-demotion
+ (due to CONVDEADLK) might mean other locks, and/or this lock, are
+ now grantable. We have to try to grant other converting locks
+ before we try again to grant this one. */
+
+ if (is_demoted(lkb)) {
+ grant_pending_convert(r, DLM_LOCK_IV);
+ if (_can_be_granted(r, lkb, 1)) {
+ grant_lock(r, lkb);
+ queue_cast(r, lkb, 0);
grant_pending_locks(r);
+ goto out;
+ }
+ /* else fall through and move to convert queue */
+ }
+
+ if (can_be_queued(lkb)) {
error = -EINPROGRESS;
del_lkb(r, lkb);
add_lkb(r, lkb, DLM_LKSTS_CONVERT);
* receive_lookup_reply send_lookup_reply
*/
-static int create_message(struct dlm_rsb *r, struct dlm_lkb *lkb,
- int to_nodeid, int mstype,
- struct dlm_message **ms_ret,
- struct dlm_mhandle **mh_ret)
+static int _create_message(struct dlm_ls *ls, int mb_len,
+ int to_nodeid, int mstype,
+ struct dlm_message **ms_ret,
+ struct dlm_mhandle **mh_ret)
{
struct dlm_message *ms;
struct dlm_mhandle *mh;
char *mb;
- int mb_len = sizeof(struct dlm_message);
-
- switch (mstype) {
- case DLM_MSG_REQUEST:
- case DLM_MSG_LOOKUP:
- case DLM_MSG_REMOVE:
- mb_len += r->res_length;
- break;
- case DLM_MSG_CONVERT:
- case DLM_MSG_UNLOCK:
- case DLM_MSG_REQUEST_REPLY:
- case DLM_MSG_CONVERT_REPLY:
- case DLM_MSG_GRANT:
- if (lkb && lkb->lkb_lvbptr)
- mb_len += r->res_ls->ls_lvblen;
- break;
- }
/* get_buffer gives us a message handle (mh) that we need to
pass into lowcomms_commit and a message buffer (mb) that we
ms = (struct dlm_message *) mb;
ms->m_header.h_version = (DLM_HEADER_MAJOR | DLM_HEADER_MINOR);
- ms->m_header.h_lockspace = r->res_ls->ls_global_id;
+ ms->m_header.h_lockspace = ls->ls_global_id;
ms->m_header.h_nodeid = dlm_our_nodeid();
ms->m_header.h_length = mb_len;
ms->m_header.h_cmd = DLM_MSG;
return 0;
}
+static int create_message(struct dlm_rsb *r, struct dlm_lkb *lkb,
+ int to_nodeid, int mstype,
+ struct dlm_message **ms_ret,
+ struct dlm_mhandle **mh_ret)
+{
+ int mb_len = sizeof(struct dlm_message);
+
+ switch (mstype) {
+ case DLM_MSG_REQUEST:
+ case DLM_MSG_LOOKUP:
+ case DLM_MSG_REMOVE:
+ mb_len += r->res_length;
+ break;
+ case DLM_MSG_CONVERT:
+ case DLM_MSG_UNLOCK:
+ case DLM_MSG_REQUEST_REPLY:
+ case DLM_MSG_CONVERT_REPLY:
+ case DLM_MSG_GRANT:
+ if (lkb && lkb->lkb_lvbptr)
+ mb_len += r->res_ls->ls_lvblen;
+ break;
+ }
+
+ return _create_message(r->res_ls, mb_len, to_nodeid, mstype,
+ ms_ret, mh_ret);
+}
+
/* further lowcomms enhancements or alternate implementations may make
the return value from this function useful at some point */
lock_rsb(r);
receive_flags_reply(lkb, ms);
+ if (is_altmode(lkb))
+ munge_altmode(lkb, ms);
grant_lock_pc(r, lkb, ms);
queue_cast(r, lkb, 0);
dlm_dir_remove_entry(ls, from_nodeid, ms->m_extra, len);
}
+static void receive_purge(struct dlm_ls *ls, struct dlm_message *ms)
+{
+ do_purge(ls, ms->m_nodeid, ms->m_pid);
+}
+
static void receive_request_reply(struct dlm_ls *ls, struct dlm_message *ms)
{
struct dlm_lkb *lkb;
/* request was queued or granted on remote master */
receive_flags_reply(lkb, ms);
lkb->lkb_remid = ms->m_lkid;
+ if (is_altmode(lkb))
+ munge_altmode(lkb, ms);
if (result)
add_lkb(r, lkb, DLM_LKSTS_WAITING);
else {
case -EINPROGRESS:
/* convert was queued on remote master */
+ receive_flags_reply(lkb, ms);
+ if (is_demoted(lkb))
+ munge_demoted(lkb, ms);
del_lkb(r, lkb);
add_lkb(r, lkb, DLM_LKSTS_CONVERT);
break;
case 0:
/* convert was granted on remote master */
receive_flags_reply(lkb, ms);
+ if (is_demoted(lkb))
+ munge_demoted(lkb, ms);
grant_lock_pc(r, lkb, ms);
queue_cast(r, lkb, 0);
break;
receive_lookup_reply(ls, ms);
break;
+ /* other messages */
+
+ case DLM_MSG_PURGE:
+ receive_purge(ls, ms);
+ break;
+
default:
log_error(ls, "unknown message type %d", ms->m_type);
}
unlock_recovery(ls);
}
+static void purge_proc_locks(struct dlm_ls *ls, struct dlm_user_proc *proc)
+{
+ struct dlm_lkb *lkb, *safe;
+
+ while (1) {
+ lkb = NULL;
+ spin_lock(&proc->locks_spin);
+ if (!list_empty(&proc->locks)) {
+ lkb = list_entry(proc->locks.next, struct dlm_lkb,
+ lkb_ownqueue);
+ list_del_init(&lkb->lkb_ownqueue);
+ }
+ spin_unlock(&proc->locks_spin);
+
+ if (!lkb)
+ break;
+
+ lkb->lkb_flags |= DLM_IFL_DEAD;
+ unlock_proc_lock(ls, lkb);
+ dlm_put_lkb(lkb); /* ref from proc->locks list */
+ }
+
+ spin_lock(&proc->locks_spin);
+ list_for_each_entry_safe(lkb, safe, &proc->unlocking, lkb_ownqueue) {
+ list_del_init(&lkb->lkb_ownqueue);
+ lkb->lkb_flags |= DLM_IFL_DEAD;
+ dlm_put_lkb(lkb);
+ }
+ spin_unlock(&proc->locks_spin);
+
+ spin_lock(&proc->asts_spin);
+ list_for_each_entry_safe(lkb, safe, &proc->asts, lkb_astqueue) {
+ list_del(&lkb->lkb_astqueue);
+ dlm_put_lkb(lkb);
+ }
+ spin_unlock(&proc->asts_spin);
+}
+
+/* pid of 0 means purge all orphans */
+
+static void do_purge(struct dlm_ls *ls, int nodeid, int pid)
+{
+ struct dlm_lkb *lkb, *safe;
+
+ mutex_lock(&ls->ls_orphans_mutex);
+ list_for_each_entry_safe(lkb, safe, &ls->ls_orphans, lkb_ownqueue) {
+ if (pid && lkb->lkb_ownpid != pid)
+ continue;
+ unlock_proc_lock(ls, lkb);
+ list_del_init(&lkb->lkb_ownqueue);
+ dlm_put_lkb(lkb);
+ }
+ mutex_unlock(&ls->ls_orphans_mutex);
+}
+
+static int send_purge(struct dlm_ls *ls, int nodeid, int pid)
+{
+ struct dlm_message *ms;
+ struct dlm_mhandle *mh;
+ int error;
+
+ error = _create_message(ls, sizeof(struct dlm_message), nodeid,
+ DLM_MSG_PURGE, &ms, &mh);
+ if (error)
+ return error;
+ ms->m_nodeid = nodeid;
+ ms->m_pid = pid;
+
+ return send_message(mh, ms);
+}
+
+int dlm_user_purge(struct dlm_ls *ls, struct dlm_user_proc *proc,
+ int nodeid, int pid)
+{
+ int error = 0;
+
+ if (nodeid != dlm_our_nodeid()) {
+ error = send_purge(ls, nodeid, pid);
+ } else {
+ lock_recovery(ls);
+ if (pid == current->pid)
+ purge_proc_locks(ls, proc);
+ else
+ do_purge(ls, nodeid, pid);
+ unlock_recovery(ls);
+ }
+ return error;
+}
+
projects / linux-2.6 / blobdiff