err.no Git - linux-2.6/blob - fs/gfs2/lm.c

   1 /*
   2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3  * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
   4  *
   5  * This copyrighted material is made available to anyone wishing to use,
   6  * modify, copy, or redistribute it subject to the terms and conditions
   7  * of the GNU General Public License version 2.
   8  */
   9
  10 #include <linux/sched.h>
  11 #include <linux/slab.h>
  12 #include <linux/spinlock.h>
  13 #include <linux/completion.h>
  14 #include <linux/buffer_head.h>
  15 #include <linux/delay.h>
  16 #include <linux/gfs2_ondisk.h>
  17
  18 #include "gfs2.h"
  19 #include "lm_interface.h"
  20 #include "incore.h"
  21 #include "glock.h"
  22 #include "lm.h"
  23 #include "super.h"
  24 #include "util.h"
  25
  26 /**
  27  * gfs2_lm_mount - mount a locking protocol
  28  * @sdp: the filesystem
  29  * @args: mount arguements
  30  * @silent: if 1, don't complain if the FS isn't a GFS2 fs
  31  *
  32  * Returns: errno
  33  */
  34
  35 int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent)
  36 {
  37         char *proto = sdp->sd_proto_name;
  38         char *table = sdp->sd_table_name;
  39         int flags = 0;
  40         int error;
  41
  42         if (sdp->sd_args.ar_spectator)
  43                 flags |= LM_MFLAG_SPECTATOR;
  44
  45         fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table);
  46
  47         error = gfs2_mount_lockproto(proto, table, sdp->sd_args.ar_hostdata,
  48                                      gfs2_glock_cb, sdp,
  49                                      GFS2_MIN_LVB_SIZE, flags,
  50                                      &sdp->sd_lockstruct, &sdp->sd_kobj);
  51         if (error) {
  52                 fs_info(sdp, "can't mount proto=%s, table=%s, hostdata=%s\n",
  53                         proto, table, sdp->sd_args.ar_hostdata);
  54                 goto out;
  55         }
  56
  57         if (gfs2_assert_warn(sdp, sdp->sd_lockstruct.ls_lockspace) ||
  58             gfs2_assert_warn(sdp, sdp->sd_lockstruct.ls_ops) ||
  59             gfs2_assert_warn(sdp, sdp->sd_lockstruct.ls_lvb_size >=
  60                                   GFS2_MIN_LVB_SIZE)) {
  61                 gfs2_unmount_lockproto(&sdp->sd_lockstruct);
  62                 goto out;
  63         }
  64
  65         if (sdp->sd_args.ar_spectator)
  66                 snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.s", table);
  67         else
  68                 snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.%u", table,
  69                          sdp->sd_lockstruct.ls_jid);
  70
  71         fs_info(sdp, "Joined cluster. Now mounting FS...\n");
  72
  73         if ((sdp->sd_lockstruct.ls_flags & LM_LSFLAG_LOCAL) &&
  74             !sdp->sd_args.ar_ignore_local_fs) {
  75                 sdp->sd_args.ar_localflocks = 1;
  76                 sdp->sd_args.ar_localcaching = 1;
  77         }
  78
  79  out:
  80         return error;
  81 }
  82
  83 void gfs2_lm_others_may_mount(struct gfs2_sbd *sdp)
  84 {
  85         if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
  86                 sdp->sd_lockstruct.ls_ops->lm_others_may_mount(
  87                                         sdp->sd_lockstruct.ls_lockspace);
  88 }
  89
  90 void gfs2_lm_unmount(struct gfs2_sbd *sdp)
  91 {
  92         if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
  93                 gfs2_unmount_lockproto(&sdp->sd_lockstruct);
  94 }
  95
  96 int gfs2_lm_withdraw(struct gfs2_sbd *sdp, char *fmt, ...)
  97 {
  98         va_list args;
  99
 100         if (test_and_set_bit(SDF_SHUTDOWN, &sdp->sd_flags))
 101                 return 0;
 102
 103         va_start(args, fmt);
 104         vprintk(fmt, args);
 105         va_end(args);
 106
 107         fs_err(sdp, "about to withdraw from the cluster\n");
 108         BUG_ON(sdp->sd_args.ar_debug);
 109
 110
 111         fs_err(sdp, "waiting for outstanding I/O\n");
 112
 113         /* FIXME: suspend dm device so oustanding bio's complete
 114            and all further io requests fail */
 115
 116         fs_err(sdp, "telling LM to withdraw\n");
 117         gfs2_withdraw_lockproto(&sdp->sd_lockstruct);
 118         fs_err(sdp, "withdrawn\n");
 119         dump_stack();
 120
 121         return -1;
 122 }
 123
 124 int gfs2_lm_get_lock(struct gfs2_sbd *sdp, struct lm_lockname *name,
 125                      lm_lock_t **lockp)
 126 {
 127         int error;
 128         if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
 129                 error = -EIO;
 130         else
 131                 error = sdp->sd_lockstruct.ls_ops->lm_get_lock(
 132                                 sdp->sd_lockstruct.ls_lockspace, name, lockp);
 133         return error;
 134 }
 135
 136 void gfs2_lm_put_lock(struct gfs2_sbd *sdp, lm_lock_t *lock)
 137 {
 138         if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
 139                 sdp->sd_lockstruct.ls_ops->lm_put_lock(lock);
 140 }
 141
 142 unsigned int gfs2_lm_lock(struct gfs2_sbd *sdp, lm_lock_t *lock,
 143                           unsigned int cur_state, unsigned int req_state,
 144                           unsigned int flags)
 145 {
 146         int ret;
 147         if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
 148                 ret = 0;
 149         else
 150                 ret = sdp->sd_lockstruct.ls_ops->lm_lock(lock,
 151                                                          cur_state,
 152                                                          req_state, flags);
 153         return ret;
 154 }
 155
 156 unsigned int gfs2_lm_unlock(struct gfs2_sbd *sdp, lm_lock_t *lock,
 157                             unsigned int cur_state)
 158 {
 159         int ret;
 160         if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
 161                 ret = 0;
 162         else
 163                 ret =  sdp->sd_lockstruct.ls_ops->lm_unlock(lock, cur_state);
 164         return ret;
 165 }
 166
 167 void gfs2_lm_cancel(struct gfs2_sbd *sdp, lm_lock_t *lock)
 168 {
 169         if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
 170                 sdp->sd_lockstruct.ls_ops->lm_cancel(lock);
 171 }
 172
 173 int gfs2_lm_hold_lvb(struct gfs2_sbd *sdp, lm_lock_t *lock, char **lvbp)
 174 {
 175         int error;
 176         if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
 177                 error = -EIO;
 178         else
 179                 error = sdp->sd_lockstruct.ls_ops->lm_hold_lvb(lock, lvbp);
 180         return error;
 181 }
 182
 183 void gfs2_lm_unhold_lvb(struct gfs2_sbd *sdp, lm_lock_t *lock, char *lvb)
 184 {
 185         if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
 186                 sdp->sd_lockstruct.ls_ops->lm_unhold_lvb(lock, lvb);
 187 }
 188
 189 #if 0
 190 void gfs2_lm_sync_lvb(struct gfs2_sbd *sdp, lm_lock_t *lock, char *lvb)
 191 {
 192         if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
 193                 sdp->sd_lockstruct.ls_ops->lm_sync_lvb(lock, lvb);
 194 }
 195 #endif  /*  0  */
 196
 197 int gfs2_lm_plock_get(struct gfs2_sbd *sdp, struct lm_lockname *name,
 198                       struct file *file, struct file_lock *fl)
 199 {
 200         int error;
 201         if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
 202                 error = -EIO;
 203         else
 204                 error = sdp->sd_lockstruct.ls_ops->lm_plock_get(
 205                         sdp->sd_lockstruct.ls_lockspace,
 206                         name, file, fl);
 207         return error;
 208 }
 209
 210 int gfs2_lm_plock(struct gfs2_sbd *sdp, struct lm_lockname *name,
 211                   struct file *file, int cmd, struct file_lock *fl)
 212 {
 213         int error;
 214         if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
 215                 error = -EIO;
 216         else
 217                 error = sdp->sd_lockstruct.ls_ops->lm_plock(
 218                         sdp->sd_lockstruct.ls_lockspace,
 219                         name, file, cmd, fl);
 220         return error;
 221 }
 222
 223 int gfs2_lm_punlock(struct gfs2_sbd *sdp, struct lm_lockname *name,
 224                     struct file *file, struct file_lock *fl)
 225 {
 226         int error;
 227         if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
 228                 error = -EIO;
 229         else
 230                 error = sdp->sd_lockstruct.ls_ops->lm_punlock(
 231                         sdp->sd_lockstruct.ls_lockspace,
 232                         name, file, fl);
 233         return error;
 234 }
 235
 236 void gfs2_lm_recovery_done(struct gfs2_sbd *sdp, unsigned int jid,
 237                            unsigned int message)
 238 {
 239         if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
 240                 sdp->sd_lockstruct.ls_ops->lm_recovery_done(
 241                         sdp->sd_lockstruct.ls_lockspace, jid, message);
 242 }
 243