fs/gfs2/util.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   4  * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
   5  */
   6
   7 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   8
   9 #include <linux/spinlock.h>
  10 #include <linux/completion.h>
  11 #include <linux/buffer_head.h>
  12 #include <linux/crc32.h>
  13 #include <linux/gfs2_ondisk.h>
  14 #include <linux/delay.h>
  15 #include <linux/uaccess.h>
  16
  17 #include "gfs2.h"
  18 #include "incore.h"
  19 #include "glock.h"
  20 #include "glops.h"
  21 #include "log.h"
  22 #include "lops.h"
  23 #include "recovery.h"
  24 #include "rgrp.h"
  25 #include "super.h"
  26 #include "util.h"
  27
  28 struct kmem_cache *gfs2_glock_cachep __read_mostly;
  29 struct kmem_cache *gfs2_glock_aspace_cachep __read_mostly;
  30 struct kmem_cache *gfs2_inode_cachep __read_mostly;
  31 struct kmem_cache *gfs2_bufdata_cachep __read_mostly;
  32 struct kmem_cache *gfs2_rgrpd_cachep __read_mostly;
  33 struct kmem_cache *gfs2_quotad_cachep __read_mostly;
  34 struct kmem_cache *gfs2_qadata_cachep __read_mostly;
  35 struct kmem_cache *gfs2_trans_cachep __read_mostly;
  36 mempool_t *gfs2_page_pool __read_mostly;
  37
  38 void gfs2_assert_i(struct gfs2_sbd *sdp)
  39 {
  40         fs_emerg(sdp, "fatal assertion failed\n");
  41 }
  42
  43 /**
  44  * check_journal_clean - Make sure a journal is clean for a spectator mount
  45  * @sdp: The GFS2 superblock
  46  * @jd: The journal descriptor
  47  * @verbose: Show more prints in the log
  48  *
  49  * Returns: 0 if the journal is clean or locked, else an error
  50  */
  51 int check_journal_clean(struct gfs2_sbd *sdp, struct gfs2_jdesc *jd,
  52                         bool verbose)
  53 {
  54         int error;
  55         struct gfs2_holder j_gh;
  56         struct gfs2_log_header_host head;
  57         struct gfs2_inode *ip;
  58
  59         ip = GFS2_I(jd->jd_inode);
  60         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_NOEXP |
  61                                    GL_EXACT | GL_NOCACHE, &j_gh);
  62         if (error) {
  63                 if (verbose)
  64                         fs_err(sdp, "Error %d locking journal for spectator "
  65                                "mount.\n", error);
  66                 return -EPERM;
  67         }
  68         error = gfs2_jdesc_check(jd);
  69         if (error) {
  70                 if (verbose)
  71                         fs_err(sdp, "Error checking journal for spectator "
  72                                "mount.\n");
  73                 goto out_unlock;
  74         }
  75         error = gfs2_find_jhead(jd, &head, false);
  76         if (error) {
  77                 if (verbose)
  78                         fs_err(sdp, "Error parsing journal for spectator "
  79                                "mount.\n");
  80                 goto out_unlock;
  81         }
  82         if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
  83                 error = -EPERM;
  84                 if (verbose)
  85                         fs_err(sdp, "jid=%u: Journal is dirty, so the first "
  86                                "mounter must not be a spectator.\n",
  87                                jd->jd_jid);
  88         }
  89
  90 out_unlock:
  91         gfs2_glock_dq_uninit(&j_gh);
  92         return error;
  93 }
  94
  95 /**
  96  * gfs2_freeze_lock - hold the freeze glock
  97  * @sdp: the superblock
  98  * @freeze_gh: pointer to the requested holder
  99  * @caller_flags: any additional flags needed by the caller
 100  */
 101 int gfs2_freeze_lock(struct gfs2_sbd *sdp, struct gfs2_holder *freeze_gh,
 102                      int caller_flags)
 103 {
 104         int flags = LM_FLAG_NOEXP | GL_EXACT | caller_flags;
 105         int error;
 106
 107         error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED, flags,
 108                                    freeze_gh);
 109         if (error && error != GLR_TRYFAILED)
 110                 fs_err(sdp, "can't lock the freeze lock: %d\n", error);
 111         return error;
 112 }
 113
 114 void gfs2_freeze_unlock(struct gfs2_holder *freeze_gh)
 115 {
 116         if (gfs2_holder_initialized(freeze_gh))
 117                 gfs2_glock_dq_uninit(freeze_gh);
 118 }
 119
 120 static void signal_our_withdraw(struct gfs2_sbd *sdp)
 121 {
 122         struct gfs2_glock *live_gl = sdp->sd_live_gh.gh_gl;
 123         struct inode *inode;
 124         struct gfs2_inode *ip;
 125         struct gfs2_glock *i_gl;
 126         u64 no_formal_ino;
 127         int log_write_allowed = test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
 128         int ret = 0;
 129         int tries;
 130
 131         if (test_bit(SDF_NORECOVERY, &sdp->sd_flags) || !sdp->sd_jdesc)
 132                 return;
 133
 134         gfs2_ail_drain(sdp); /* frees all transactions */
 135         inode = sdp->sd_jdesc->jd_inode;
 136         ip = GFS2_I(inode);
 137         i_gl = ip->i_gl;
 138         no_formal_ino = ip->i_no_formal_ino;
 139
 140         /* Prevent any glock dq until withdraw recovery is complete */
 141         set_bit(SDF_WITHDRAW_RECOVERY, &sdp->sd_flags);
 142         /*
 143          * Don't tell dlm we're bailing until we have no more buffers in the
 144          * wind. If journal had an IO error, the log code should just purge
 145          * the outstanding buffers rather than submitting new IO. Making the
 146          * file system read-only will flush the journal, etc.
 147          *
 148          * During a normal unmount, gfs2_make_fs_ro calls gfs2_log_shutdown
 149          * which clears SDF_JOURNAL_LIVE. In a withdraw, we must not write
 150          * any UNMOUNT log header, so we can't call gfs2_log_shutdown, and
 151          * therefore we need to clear SDF_JOURNAL_LIVE manually.
 152          */
 153         clear_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
 154         if (!sb_rdonly(sdp->sd_vfs)) {
 155                 struct gfs2_holder freeze_gh;
 156
 157                 gfs2_holder_mark_uninitialized(&freeze_gh);
 158                 if (sdp->sd_freeze_gl &&
 159                     !gfs2_glock_is_locked_by_me(sdp->sd_freeze_gl)) {
 160                         ret = gfs2_freeze_lock(sdp, &freeze_gh,
 161                                        log_write_allowed ? 0 : LM_FLAG_TRY);
 162                         if (ret == GLR_TRYFAILED)
 163                                 ret = 0;
 164                 }
 165                 if (!ret)
 166                         gfs2_make_fs_ro(sdp);
 167                 /*
 168                  * Dequeue any pending non-system glock holders that can no
 169                  * longer be granted because the file system is withdrawn.
 170                  */
 171                 gfs2_gl_dq_holders(sdp);
 172                 gfs2_freeze_unlock(&freeze_gh);
 173         }
 174
 175         if (sdp->sd_lockstruct.ls_ops->lm_lock == NULL) { /* lock_nolock */
 176                 if (!ret)
 177                         ret = -EIO;
 178                 clear_bit(SDF_WITHDRAW_RECOVERY, &sdp->sd_flags);
 179                 goto skip_recovery;
 180         }
 181         /*
 182          * Drop the glock for our journal so another node can recover it.
 183          */
 184         if (gfs2_holder_initialized(&sdp->sd_journal_gh)) {
 185                 gfs2_glock_dq_wait(&sdp->sd_journal_gh);
 186                 gfs2_holder_uninit(&sdp->sd_journal_gh);
 187         }
 188         sdp->sd_jinode_gh.gh_flags |= GL_NOCACHE;
 189         gfs2_glock_dq(&sdp->sd_jinode_gh);
 190         if (test_bit(SDF_FS_FROZEN, &sdp->sd_flags)) {
 191                 /* Make sure gfs2_unfreeze works if partially-frozen */
 192                 flush_work(&sdp->sd_freeze_work);
 193                 atomic_set(&sdp->sd_freeze_state, SFS_FROZEN);
 194                 thaw_super(sdp->sd_vfs);
 195         } else {
 196                 wait_on_bit(&i_gl->gl_flags, GLF_DEMOTE,
 197                             TASK_UNINTERRUPTIBLE);
 198         }
 199
 200         /*
 201          * holder_uninit to force glock_put, to force dlm to let go
 202          */
 203         gfs2_holder_uninit(&sdp->sd_jinode_gh);
 204
 205         /*
 206          * Note: We need to be careful here:
 207          * Our iput of jd_inode will evict it. The evict will dequeue its
 208          * glock, but the glock dq will wait for the withdraw unless we have
 209          * exception code in glock_dq.
 210          */
 211         iput(inode);
 212         sdp->sd_jdesc->jd_inode = NULL;
 213         /*
 214          * Wait until the journal inode's glock is freed. This allows try locks
 215          * on other nodes to be successful, otherwise we remain the owner of
 216          * the glock as far as dlm is concerned.
 217          */
 218         if (i_gl->gl_ops->go_free) {
 219                 set_bit(GLF_FREEING, &i_gl->gl_flags);
 220                 wait_on_bit(&i_gl->gl_flags, GLF_FREEING, TASK_UNINTERRUPTIBLE);
 221         }
 222
 223         /*
 224          * Dequeue the "live" glock, but keep a reference so it's never freed.
 225          */
 226         gfs2_glock_hold(live_gl);
 227         gfs2_glock_dq_wait(&sdp->sd_live_gh);
 228         /*
 229          * We enqueue the "live" glock in EX so that all other nodes
 230          * get a demote request and act on it. We don't really want the
 231          * lock in EX, so we send a "try" lock with 1CB to produce a callback.
 232          */
 233         fs_warn(sdp, "Requesting recovery of jid %d.\n",
 234                 sdp->sd_lockstruct.ls_jid);
 235         gfs2_holder_reinit(LM_ST_EXCLUSIVE,
 236                            LM_FLAG_TRY_1CB | LM_FLAG_NOEXP | GL_NOPID,
 237                            &sdp->sd_live_gh);
 238         msleep(GL_GLOCK_MAX_HOLD);
 239         /*
 240          * This will likely fail in a cluster, but succeed standalone:
 241          */
 242         ret = gfs2_glock_nq(&sdp->sd_live_gh);
 243
 244         /*
 245          * If we actually got the "live" lock in EX mode, there are no other
 246          * nodes available to replay our journal. So we try to replay it
 247          * ourselves. We hold the "live" glock to prevent other mounters
 248          * during recovery, then just dequeue it and reacquire it in our
 249          * normal SH mode. Just in case the problem that caused us to
 250          * withdraw prevents us from recovering our journal (e.g. io errors
 251          * and such) we still check if the journal is clean before proceeding
 252          * but we may wait forever until another mounter does the recovery.
 253          */
 254         if (ret == 0) {
 255                 fs_warn(sdp, "No other mounters found. Trying to recover our "
 256                         "own journal jid %d.\n", sdp->sd_lockstruct.ls_jid);
 257                 if (gfs2_recover_journal(sdp->sd_jdesc, 1))
 258                         fs_warn(sdp, "Unable to recover our journal jid %d.\n",
 259                                 sdp->sd_lockstruct.ls_jid);
 260                 gfs2_glock_dq_wait(&sdp->sd_live_gh);
 261                 gfs2_holder_reinit(LM_ST_SHARED,
 262                                    LM_FLAG_NOEXP | GL_EXACT | GL_NOPID,
 263                                    &sdp->sd_live_gh);
 264                 gfs2_glock_nq(&sdp->sd_live_gh);
 265         }
 266
 267         gfs2_glock_queue_put(live_gl); /* drop extra reference we acquired */
 268         clear_bit(SDF_WITHDRAW_RECOVERY, &sdp->sd_flags);
 269
 270         /*
 271          * At this point our journal is evicted, so we need to get a new inode
 272          * for it. Once done, we need to call gfs2_find_jhead which
 273          * calls gfs2_map_journal_extents to map it for us again.
 274          *
 275          * Note that we don't really want it to look up a FREE block. The
 276          * GFS2_BLKST_FREE simply overrides a block check in gfs2_inode_lookup
 277          * which would otherwise fail because it requires grabbing an rgrp
 278          * glock, which would fail with -EIO because we're withdrawing.
 279          */
 280         inode = gfs2_inode_lookup(sdp->sd_vfs, DT_UNKNOWN,
 281                                   sdp->sd_jdesc->jd_no_addr, no_formal_ino,
 282                                   GFS2_BLKST_FREE);
 283         if (IS_ERR(inode)) {
 284                 fs_warn(sdp, "Reprocessing of jid %d failed with %ld.\n",
 285                         sdp->sd_lockstruct.ls_jid, PTR_ERR(inode));
 286                 goto skip_recovery;
 287         }
 288         sdp->sd_jdesc->jd_inode = inode;
 289         d_mark_dontcache(inode);
 290
 291         /*
 292          * Now wait until recovery is complete.
 293          */
 294         for (tries = 0; tries < 10; tries++) {
 295                 ret = check_journal_clean(sdp, sdp->sd_jdesc, false);
 296                 if (!ret)
 297                         break;
 298                 msleep(HZ);
 299                 fs_warn(sdp, "Waiting for journal recovery jid %d.\n",
 300                         sdp->sd_lockstruct.ls_jid);
 301         }
 302 skip_recovery:
 303         if (!ret)
 304                 fs_warn(sdp, "Journal recovery complete for jid %d.\n",
 305                         sdp->sd_lockstruct.ls_jid);
 306         else
 307                 fs_warn(sdp, "Journal recovery skipped for jid %d until next "
 308                         "mount.\n", sdp->sd_lockstruct.ls_jid);
 309         fs_warn(sdp, "Glock dequeues delayed: %lu\n", sdp->sd_glock_dqs_held);
 310         sdp->sd_glock_dqs_held = 0;
 311         wake_up_bit(&sdp->sd_flags, SDF_WITHDRAW_RECOVERY);
 312 }
 313
 314 void gfs2_lm(struct gfs2_sbd *sdp, const char *fmt, ...)
 315 {
 316         struct va_format vaf;
 317         va_list args;
 318
 319         if (sdp->sd_args.ar_errors == GFS2_ERRORS_WITHDRAW &&
 320             test_bit(SDF_WITHDRAWN, &sdp->sd_flags))
 321                 return;
 322
 323         va_start(args, fmt);
 324         vaf.fmt = fmt;
 325         vaf.va = &args;
 326         fs_err(sdp, "%pV", &vaf);
 327         va_end(args);
 328 }
 329
 330 int gfs2_withdraw(struct gfs2_sbd *sdp)
 331 {
 332         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 333         const struct lm_lockops *lm = ls->ls_ops;
 334
 335         if (sdp->sd_args.ar_errors == GFS2_ERRORS_WITHDRAW &&
 336             test_and_set_bit(SDF_WITHDRAWN, &sdp->sd_flags)) {
 337                 if (!test_bit(SDF_WITHDRAW_IN_PROG, &sdp->sd_flags))
 338                         return -1;
 339
 340                 wait_on_bit(&sdp->sd_flags, SDF_WITHDRAW_IN_PROG,
 341                             TASK_UNINTERRUPTIBLE);
 342                 return -1;
 343         }
 344
 345         set_bit(SDF_WITHDRAW_IN_PROG, &sdp->sd_flags);
 346
 347         if (sdp->sd_args.ar_errors == GFS2_ERRORS_WITHDRAW) {
 348                 fs_err(sdp, "about to withdraw this file system\n");
 349                 BUG_ON(sdp->sd_args.ar_debug);
 350
 351                 signal_our_withdraw(sdp);
 352
 353                 kobject_uevent(&sdp->sd_kobj, KOBJ_OFFLINE);
 354
 355                 if (!strcmp(sdp->sd_lockstruct.ls_ops->lm_proto_name, "lock_dlm"))
 356                         wait_for_completion(&sdp->sd_wdack);
 357
 358                 if (lm->lm_unmount) {
 359                         fs_err(sdp, "telling LM to unmount\n");
 360                         lm->lm_unmount(sdp);
 361                 }
 362                 set_bit(SDF_SKIP_DLM_UNLOCK, &sdp->sd_flags);
 363                 fs_err(sdp, "File system withdrawn\n");
 364                 dump_stack();
 365                 clear_bit(SDF_WITHDRAW_IN_PROG, &sdp->sd_flags);
 366                 smp_mb__after_atomic();
 367                 wake_up_bit(&sdp->sd_flags, SDF_WITHDRAW_IN_PROG);
 368         }
 369
 370         if (sdp->sd_args.ar_errors == GFS2_ERRORS_PANIC)
 371                 panic("GFS2: fsid=%s: panic requested\n", sdp->sd_fsname);
 372
 373         return -1;
 374 }
 375
 376 /*
 377  * gfs2_assert_withdraw_i - Cause the machine to withdraw if @assertion is false
 378  */
 379
 380 void gfs2_assert_withdraw_i(struct gfs2_sbd *sdp, char *assertion,
 381                             const char *function, char *file, unsigned int line,
 382                             bool delayed)
 383 {
 384         if (gfs2_withdrawn(sdp))
 385                 return;
 386
 387         fs_err(sdp,
 388                "fatal: assertion \"%s\" failed\n"
 389                "   function = %s, file = %s, line = %u\n",
 390                assertion, function, file, line);
 391
 392         /*
 393          * If errors=panic was specified on mount, it won't help to delay the
 394          * withdraw.
 395          */
 396         if (sdp->sd_args.ar_errors == GFS2_ERRORS_PANIC)
 397                 delayed = false;
 398
 399         if (delayed)
 400                 gfs2_withdraw_delayed(sdp);
 401         else
 402                 gfs2_withdraw(sdp);
 403         dump_stack();
 404 }
 405
 406 /*
 407  * gfs2_assert_warn_i - Print a message to the console if @assertion is false
 408  */
 409
 410 void gfs2_assert_warn_i(struct gfs2_sbd *sdp, char *assertion,
 411                         const char *function, char *file, unsigned int line)
 412 {
 413         if (time_before(jiffies,
 414                         sdp->sd_last_warning +
 415                         gfs2_tune_get(sdp, gt_complain_secs) * HZ))
 416                 return;
 417
 418         if (sdp->sd_args.ar_errors == GFS2_ERRORS_WITHDRAW)
 419                 fs_warn(sdp, "warning: assertion \"%s\" failed at function = %s, file = %s, line = %u\n",
 420                         assertion, function, file, line);
 421
 422         if (sdp->sd_args.ar_debug)
 423                 BUG();
 424         else
 425                 dump_stack();
 426
 427         if (sdp->sd_args.ar_errors == GFS2_ERRORS_PANIC)
 428                 panic("GFS2: fsid=%s: warning: assertion \"%s\" failed\n"
 429                       "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
 430                       sdp->sd_fsname, assertion,
 431                       sdp->sd_fsname, function, file, line);
 432
 433         sdp->sd_last_warning = jiffies;
 434 }
 435
 436 /*
 437  * gfs2_consist_i - Flag a filesystem consistency error and withdraw
 438  */
 439
 440 void gfs2_consist_i(struct gfs2_sbd *sdp, const char *function,
 441                     char *file, unsigned int line)
 442 {
 443         gfs2_lm(sdp,
 444                 "fatal: filesystem consistency error - function = %s, file = %s, line = %u\n",
 445                 function, file, line);
 446         gfs2_withdraw(sdp);
 447 }
 448
 449 /*
 450  * gfs2_consist_inode_i - Flag an inode consistency error and withdraw
 451  */
 452
 453 void gfs2_consist_inode_i(struct gfs2_inode *ip,
 454                           const char *function, char *file, unsigned int line)
 455 {
 456         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 457
 458         gfs2_lm(sdp,
 459                 "fatal: filesystem consistency error\n"
 460                 "  inode = %llu %llu\n"
 461                 "  function = %s, file = %s, line = %u\n",
 462                 (unsigned long long)ip->i_no_formal_ino,
 463                 (unsigned long long)ip->i_no_addr,
 464                 function, file, line);
 465         gfs2_dump_glock(NULL, ip->i_gl, 1);
 466         gfs2_withdraw(sdp);
 467 }
 468
 469 /*
 470  * gfs2_consist_rgrpd_i - Flag a RG consistency error and withdraw
 471  */
 472
 473 void gfs2_consist_rgrpd_i(struct gfs2_rgrpd *rgd,
 474                           const char *function, char *file, unsigned int line)
 475 {
 476         struct gfs2_sbd *sdp = rgd->rd_sbd;
 477         char fs_id_buf[sizeof(sdp->sd_fsname) + 7];
 478
 479         sprintf(fs_id_buf, "fsid=%s: ", sdp->sd_fsname);
 480         gfs2_rgrp_dump(NULL, rgd, fs_id_buf);
 481         gfs2_lm(sdp,
 482                 "fatal: filesystem consistency error\n"
 483                 "  RG = %llu\n"
 484                 "  function = %s, file = %s, line = %u\n",
 485                 (unsigned long long)rgd->rd_addr,
 486                 function, file, line);
 487         gfs2_dump_glock(NULL, rgd->rd_gl, 1);
 488         gfs2_withdraw(sdp);
 489 }
 490
 491 /*
 492  * gfs2_meta_check_ii - Flag a magic number consistency error and withdraw
 493  * Returns: -1 if this call withdrew the machine,
 494  *          -2 if it was already withdrawn
 495  */
 496
 497 int gfs2_meta_check_ii(struct gfs2_sbd *sdp, struct buffer_head *bh,
 498                        const char *type, const char *function, char *file,
 499                        unsigned int line)
 500 {
 501         int me;
 502
 503         gfs2_lm(sdp,
 504                 "fatal: invalid metadata block\n"
 505                 "  bh = %llu (%s)\n"
 506                 "  function = %s, file = %s, line = %u\n",
 507                 (unsigned long long)bh->b_blocknr, type,
 508                 function, file, line);
 509         me = gfs2_withdraw(sdp);
 510         return (me) ? -1 : -2;
 511 }
 512
 513 /*
 514  * gfs2_metatype_check_ii - Flag a metadata type consistency error and withdraw
 515  * Returns: -1 if this call withdrew the machine,
 516  *          -2 if it was already withdrawn
 517  */
 518
 519 int gfs2_metatype_check_ii(struct gfs2_sbd *sdp, struct buffer_head *bh,
 520                            u16 type, u16 t, const char *function,
 521                            char *file, unsigned int line)
 522 {
 523         int me;
 524
 525         gfs2_lm(sdp,
 526                 "fatal: invalid metadata block\n"
 527                 "  bh = %llu (type: exp=%u, found=%u)\n"
 528                 "  function = %s, file = %s, line = %u\n",
 529                 (unsigned long long)bh->b_blocknr, type, t,
 530                 function, file, line);
 531         me = gfs2_withdraw(sdp);
 532         return (me) ? -1 : -2;
 533 }
 534
 535 /*
 536  * gfs2_io_error_i - Flag an I/O error and withdraw
 537  * Returns: -1 if this call withdrew the machine,
 538  *          0 if it was already withdrawn
 539  */
 540
 541 int gfs2_io_error_i(struct gfs2_sbd *sdp, const char *function, char *file,
 542                     unsigned int line)
 543 {
 544         gfs2_lm(sdp,
 545                 "fatal: I/O error\n"
 546                 "  function = %s, file = %s, line = %u\n",
 547                 function, file, line);
 548         return gfs2_withdraw(sdp);
 549 }
 550
 551 /*
 552  * gfs2_io_error_bh_i - Flag a buffer I/O error
 553  * @withdraw: withdraw the filesystem
 554  */
 555
 556 void gfs2_io_error_bh_i(struct gfs2_sbd *sdp, struct buffer_head *bh,
 557                         const char *function, char *file, unsigned int line,
 558                         bool withdraw)
 559 {
 560         if (gfs2_withdrawn(sdp))
 561                 return;
 562
 563         fs_err(sdp, "fatal: I/O error\n"
 564                "  block = %llu\n"
 565                "  function = %s, file = %s, line = %u\n",
 566                (unsigned long long)bh->b_blocknr, function, file, line);
 567         if (withdraw)
 568                 gfs2_withdraw(sdp);
 569 }
 570