LCOV - code coverage report
Current view: top level - lkbce/fs/jbd - recovery.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 1 263 0.4 %
Date: 2017-01-25 Functions: 0 8 0.0 %

          Line data    Source code
       1             : /*
       2             :  * linux/fs/jbd/recovery.c
       3             :  *
       4             :  * Written by Stephen C. Tweedie <sct@redhat.com>, 1999
       5             :  *
       6             :  * Copyright 1999-2000 Red Hat Software --- All Rights Reserved
       7             :  *
       8             :  * This file is part of the Linux kernel and is made available under
       9             :  * the terms of the GNU General Public License, version 2, or at your
      10             :  * option, any later version, incorporated herein by reference.
      11             :  *
      12             :  * Journal recovery routines for the generic filesystem journaling code;
      13             :  * part of the ext2fs journaling system.
      14             :  */
      15             : 
      16             : #ifndef __KERNEL__
      17             : #include "jfs_user.h"
      18             : #else
      19             : #include <linux/time.h>
      20             : #include <linux/fs.h>
      21             : #include <linux/jbd.h>
      22             : #include <linux/errno.h>
      23             : #include <linux/slab.h>
      24             : #endif
      25             : 
      26             : /*
      27             :  * Maintain information about the progress of the recovery job, so that
      28             :  * the different passes can carry information between them.
      29             :  */
      30             : struct recovery_info
      31             : {
      32             :         tid_t           start_transaction;
      33             :         tid_t           end_transaction;
      34             : 
      35             :         int             nr_replays;
      36             :         int             nr_revokes;
      37             :         int             nr_revoke_hits;
      38             : };
      39           1 : 
      40             : enum passtype {PASS_SCAN, PASS_REVOKE, PASS_REPLAY};
      41             : static int do_one_pass(journal_t *journal,
      42             :                                 struct recovery_info *info, enum passtype pass);
      43             : static int scan_revoke_records(journal_t *, struct buffer_head *,
      44             :                                 tid_t, struct recovery_info *);
      45             : 
      46             : #ifdef __KERNEL__
      47             : 
      48             : /* Release readahead buffers after use */
      49             : static void journal_brelse_array(struct buffer_head *b[], int n)
      50             : {
      51           0 :         while (--n >= 0)
      52           0 :                 brelse (b[n]);
      53           0 : }
      54           0 : 
      55             : 
      56             : /*
      57             :  * When reading from the journal, we are going through the block device
      58           0 :  * layer directly and so there is no readahead being done for us.  We
      59             :  * need to implement any readahead ourselves if we want it to happen at
      60             :  * all.  Recovery is basically one long sequential read, so make sure we
      61             :  * do the IO in reasonably large chunks.
      62             :  *
      63             :  * This is not so critical that we need to be enormously clever about
      64             :  * the readahead size, though.  128K is a purely arbitrary, good-enough
      65             :  * fixed value.
      66             :  */
      67             : 
      68             : #define MAXBUF 8
      69             : static int do_readahead(journal_t *journal, unsigned int start)
      70             : {
      71           0 :         int err;
      72           0 :         unsigned int max, nbufs, next;
      73           0 :         unsigned int blocknr;
      74           0 :         struct buffer_head *bh;
      75           0 : 
      76           0 :         struct buffer_head * bufs[MAXBUF];
      77           0 : 
      78           0 :         /* Do up to 128K of readahead */
      79           0 :         max = start + (128 * 1024 / journal->j_blocksize);
      80           0 :         if (max > journal->j_maxlen)
      81           0 :                 max = journal->j_maxlen;
      82             : 
      83             :         /* Do the readahead itself.  We'll submit MAXBUF buffer_heads at
      84             :          * a time to the block device IO layer. */
      85             : 
      86           0 :         nbufs = 0;
      87             : 
      88           0 :         for (next = start; next < max; next++) {
      89           0 :                 err = journal_bmap(journal, next, &blocknr);
      90           0 : 
      91           0 :                 if (err) {
      92           0 :                         printk (KERN_ERR "JBD: bad block at offset %u\n",
      93             :                                 next);
      94           0 :                         goto failed;
      95             :                 }
      96             : 
      97           0 :                 bh = __getblk(journal->j_dev, blocknr, journal->j_blocksize);
      98           0 :                 if (!bh) {
      99           0 :                         err = -ENOMEM;
     100           0 :                         goto failed;
     101             :                 }
     102             : 
     103           0 :                 if (!buffer_uptodate(bh) && !buffer_locked(bh)) {
     104           0 :                         bufs[nbufs++] = bh;
     105           0 :                         if (nbufs == MAXBUF) {
     106           0 :                                 ll_rw_block(READ, nbufs, bufs);
     107           0 :                                 journal_brelse_array(bufs, nbufs);
     108           0 :                                 nbufs = 0;
     109             :                         }
     110             :                 } else
     111           0 :                         brelse(bh);
     112             :         }
     113             : 
     114           0 :         if (nbufs)
     115           0 :                 ll_rw_block(READ, nbufs, bufs);
     116           0 :         err = 0;
     117           0 : 
     118             : failed:
     119           0 :         if (nbufs)
     120           0 :                 journal_brelse_array(bufs, nbufs);
     121           0 :         return err;
     122             : }
     123             : 
     124             : #endif /* __KERNEL__ */
     125             : 
     126             : 
     127             : /*
     128             :  * Read a block from the journal
     129             :  */
     130             : 
     131             : static int jread(struct buffer_head **bhp, journal_t *journal,
     132             :                  unsigned int offset)
     133           0 : {
     134           0 :         int err;
     135           0 :         unsigned int blocknr;
     136           0 :         struct buffer_head *bh;
     137           0 : 
     138           0 :         *bhp = NULL;
     139             : 
     140           0 :         if (offset >= journal->j_maxlen) {
     141           0 :                 printk(KERN_ERR "JBD: corrupted journal superblock\n");
     142           0 :                 return -EIO;
     143             :         }
     144             : 
     145           0 :         err = journal_bmap(journal, offset, &blocknr);
     146             : 
     147           0 :         if (err) {
     148           0 :                 printk (KERN_ERR "JBD: bad block at offset %u\n",
     149             :                         offset);
     150           0 :                 return err;
     151             :         }
     152             : 
     153           0 :         bh = __getblk(journal->j_dev, blocknr, journal->j_blocksize);
     154           0 :         if (!bh)
     155           0 :                 return -ENOMEM;
     156             : 
     157           0 :         if (!buffer_uptodate(bh)) {
     158             :                 /* If this is a brand new buffer, start readahead.
     159             :                    Otherwise, we assume we are already reading it.  */
     160           0 :                 if (!buffer_req(bh))
     161           0 :                         do_readahead(journal, offset);
     162           0 :                 wait_on_buffer(bh);
     163             :         }
     164             : 
     165           0 :         if (!buffer_uptodate(bh)) {
     166           0 :                 printk (KERN_ERR "JBD: Failed to read block at offset %u\n",
     167             :                         offset);
     168           0 :                 brelse(bh);
     169           0 :                 return -EIO;
     170             :         }
     171             : 
     172           0 :         *bhp = bh;
     173           0 :         return 0;
     174             : }
     175             : 
     176             : 
     177             : /*
     178             :  * Count the number of in-use tags in a journal descriptor block.
     179             :  */
     180             : 
     181             : static int count_tags(struct buffer_head *bh, int size)
     182             : {
     183           0 :         char *                  tagp;
     184           0 :         journal_block_tag_t *   tag;
     185           0 :         int                     nr = 0;
     186             : 
     187           0 :         tagp = &bh->b_data[sizeof(journal_header_t)];
     188             : 
     189           0 :         while ((tagp - bh->b_data + sizeof(journal_block_tag_t)) <= size) {
     190           0 :                 tag = (journal_block_tag_t *) tagp;
     191           0 : 
     192           0 :                 nr++;
     193           0 :                 tagp += sizeof(journal_block_tag_t);
     194           0 :                 if (!(tag->t_flags & cpu_to_be32(JFS_FLAG_SAME_UUID)))
     195           0 :                         tagp += 16;
     196             : 
     197           0 :                 if (tag->t_flags & cpu_to_be32(JFS_FLAG_LAST_TAG))
     198           0 :                         break;
     199             :         }
     200             : 
     201           0 :         return nr;
     202           0 : }
     203             : 
     204             : 
     205             : /* Make sure we wrap around the log correctly! */
     206             : #define wrap(journal, var)                                              \
     207             : do {                                                                    \
     208             :         if (var >= (journal)->j_last)                                     \
     209             :                 var -= ((journal)->j_last - (journal)->j_first);  \
     210             : } while (0)
     211             : 
     212             : /**
     213             :  * journal_recover - recovers a on-disk journal
     214             :  * @journal: the journal to recover
     215             :  *
     216             :  * The primary function for recovering the log contents when mounting a
     217             :  * journaled device.
     218             :  *
     219             :  * Recovery is done in three passes.  In the first pass, we look for the
     220             :  * end of the log.  In the second, we assemble the list of revoke
     221             :  * blocks.  In the third and final pass, we replay any un-revoked blocks
     222             :  * in the log.
     223             :  */
     224             : int journal_recover(journal_t *journal)
     225             : {
     226           0 :         int                     err, err2;
     227           0 :         journal_superblock_t *  sb;
     228           0 : 
     229           0 :         struct recovery_info    info;
     230           0 : 
     231           0 :         memset(&info, 0, sizeof(info));
     232           0 :         sb = journal->j_superblock;
     233             : 
     234             :         /*
     235             :          * The journal superblock's s_start field (the current log head)
     236             :          * is always zero if, and only if, the journal was cleanly
     237             :          * unmounted.
     238             :          */
     239             : 
     240           0 :         if (!sb->s_start) {
     241             :                 jbd_debug(1, "No recovery required, last transaction %d\n",
     242             :                           be32_to_cpu(sb->s_sequence));
     243           0 :                 journal->j_transaction_sequence = be32_to_cpu(sb->s_sequence) + 1;
     244           0 :                 return 0;
     245             :         }
     246             : 
     247           0 :         err = do_one_pass(journal, &info, PASS_SCAN);
     248           0 :         if (!err)
     249           0 :                 err = do_one_pass(journal, &info, PASS_REVOKE);
     250           0 :         if (!err)
     251           0 :                 err = do_one_pass(journal, &info, PASS_REPLAY);
     252             : 
     253             :         jbd_debug(1, "JBD: recovery, exit status %d, "
     254             :                   "recovered transactions %u to %u\n",
     255             :                   err, info.start_transaction, info.end_transaction);
     256             :         jbd_debug(1, "JBD: Replayed %d and revoked %d/%d blocks\n",
     257             :                   info.nr_replays, info.nr_revoke_hits, info.nr_revokes);
     258             : 
     259             :         /* Restart the log at the next transaction ID, thus invalidating
     260             :          * any existing commit records in the log. */
     261           0 :         journal->j_transaction_sequence = ++info.end_transaction;
     262             : 
     263           0 :         journal_clear_revoke(journal);
     264           0 :         err2 = sync_blockdev(journal->j_fs_dev);
     265           0 :         if (!err)
     266           0 :                 err = err2;
     267             : 
     268           0 :         return err;
     269             : }
     270             : 
     271             : /**
     272             :  * journal_skip_recovery - Start journal and wipe exiting records
     273             :  * @journal: journal to startup
     274             :  *
     275             :  * Locate any valid recovery information from the journal and set up the
     276             :  * journal structures in memory to ignore it (presumably because the
     277             :  * caller has evidence that it is out of date).
     278             :  * This function does'nt appear to be exorted..
     279             :  *
     280             :  * We perform one pass over the journal to allow us to tell the user how
     281             :  * much recovery information is being erased, and to let us initialise
     282             :  * the journal transaction sequence numbers to the next unused ID.
     283             :  */
     284             : int journal_skip_recovery(journal_t *journal)
     285             : {
     286           0 :         int                     err;
     287           0 :         journal_superblock_t *  sb;
     288           0 : 
     289             :         struct recovery_info    info;
     290             : 
     291           0 :         memset (&info, 0, sizeof(info));
     292           0 :         sb = journal->j_superblock;
     293             : 
     294           0 :         err = do_one_pass(journal, &info, PASS_SCAN);
     295             : 
     296           0 :         if (err) {
     297           0 :                 printk(KERN_ERR "JBD: error %d scanning journal\n", err);
     298           0 :                 ++journal->j_transaction_sequence;
     299             :         } else {
     300             : #ifdef CONFIG_JBD_DEBUG
     301             :                 int dropped = info.end_transaction - be32_to_cpu(sb->s_sequence);
     302             : #endif
     303             :                 jbd_debug(1,
     304             :                           "JBD: ignoring %d transaction%s from the journal.\n",
     305             :                           dropped, (dropped == 1) ? "" : "s");
     306           0 :                 journal->j_transaction_sequence = ++info.end_transaction;
     307             :         }
     308             : 
     309           0 :         journal->j_tail = 0;
     310           0 :         return err;
     311             : }
     312             : 
     313             : static int do_one_pass(journal_t *journal,
     314             :                         struct recovery_info *info, enum passtype pass)
     315           0 : {
     316           0 :         unsigned int            first_commit_ID, next_commit_ID;
     317           0 :         unsigned int            next_log_block;
     318           0 :         int                     err, success = 0;
     319           0 :         journal_superblock_t *  sb;
     320           0 :         journal_header_t *      tmp;
     321           0 :         struct buffer_head *    bh;
     322           0 :         unsigned int            sequence;
     323           0 :         int                     blocktype;
     324           0 : 
     325           0 :         /* Precompute the maximum metadata descriptors in a descriptor block */
     326           0 :         int                     MAX_BLOCKS_PER_DESC;
     327           0 :         MAX_BLOCKS_PER_DESC = ((journal->j_blocksize-sizeof(journal_header_t))
     328           0 :                                / sizeof(journal_block_tag_t));
     329           0 : 
     330           0 :         /*
     331           0 :          * First thing is to establish what we expect to find in the log
     332           0 :          * (in terms of transaction IDs), and where (in terms of log
     333           0 :          * block offsets): query the superblock.
     334           0 :          */
     335           0 : 
     336           0 :         sb = journal->j_superblock;
     337           0 :         next_commit_ID = be32_to_cpu(sb->s_sequence);
     338           0 :         next_log_block = be32_to_cpu(sb->s_start);
     339           0 : 
     340           0 :         first_commit_ID = next_commit_ID;
     341           0 :         if (pass == PASS_SCAN)
     342           0 :                 info->start_transaction = first_commit_ID;
     343           0 : 
     344             :         jbd_debug(1, "Starting recovery pass %d\n", pass);
     345             : 
     346           0 :         /*
     347             :          * Now we walk through the log, transaction by transaction,
     348             :          * making sure that each transaction has a commit block in the
     349             :          * expected place.  Each complete transaction gets replayed back
     350             :          * into the main filesystem.
     351             :          */
     352             : 
     353             :         while (1) {
     354             :                 int                     flags;
     355             :                 char *                  tagp;
     356             :                 journal_block_tag_t *   tag;
     357             :                 struct buffer_head *    obh;
     358             :                 struct buffer_head *    nbh;
     359             : 
     360           0 :                 cond_resched();
     361             : 
     362             :                 /* If we already know where to stop the log traversal,
     363             :                  * check right now that we haven't gone past the end of
     364             :                  * the log. */
     365             : 
     366           0 :                 if (pass != PASS_SCAN)
     367           0 :                         if (tid_geq(next_commit_ID, info->end_transaction))
     368           0 :                                 break;
     369             : 
     370             :                 jbd_debug(2, "Scanning for sequence ID %u at %u/%u\n",
     371             :                           next_commit_ID, next_log_block, journal->j_last);
     372             : 
     373             :                 /* Skip over each chunk of the transaction looking
     374             :                  * either the next descriptor block or the final commit
     375             :                  * record. */
     376             : 
     377             :                 jbd_debug(3, "JBD: checking block %u\n", next_log_block);
     378           0 :                 err = jread(&bh, journal, next_log_block);
     379           0 :                 if (err)
     380           0 :                         goto failed;
     381             : 
     382           0 :                 next_log_block++;
     383           0 :                 wrap(journal, next_log_block);
     384             : 
     385             :                 /* What kind of buffer is it?
     386             :                  *
     387             :                  * If it is a descriptor block, check that it has the
     388             :                  * expected sequence number.  Otherwise, we're all done
     389             :                  * here. */
     390             : 
     391           0 :                 tmp = (journal_header_t *)bh->b_data;
     392             : 
     393           0 :                 if (tmp->h_magic != cpu_to_be32(JFS_MAGIC_NUMBER)) {
     394           0 :                         brelse(bh);
     395           0 :                         break;
     396             :                 }
     397             : 
     398           0 :                 blocktype = be32_to_cpu(tmp->h_blocktype);
     399           0 :                 sequence = be32_to_cpu(tmp->h_sequence);
     400             :                 jbd_debug(3, "Found magic %d, sequence %d\n",
     401             :                           blocktype, sequence);
     402             : 
     403           0 :                 if (sequence != next_commit_ID) {
     404           0 :                         brelse(bh);
     405           0 :                         break;
     406             :                 }
     407             : 
     408             :                 /* OK, we have a valid descriptor block which matches
     409             :                  * all of the sequence number checks.  What are we going
     410             :                  * to do with it?  That depends on the pass... */
     411             : 
     412             :                 switch(blocktype) {
     413           0 :                 case JFS_DESCRIPTOR_BLOCK:
     414             :                         /* If it is a valid descriptor block, replay it
     415             :                          * in pass REPLAY; otherwise, just skip over the
     416             :                          * blocks it describes. */
     417           0 :                         if (pass != PASS_REPLAY) {
     418           0 :                                 next_log_block +=
     419             :                                         count_tags(bh, journal->j_blocksize);
     420           0 :                                 wrap(journal, next_log_block);
     421           0 :                                 brelse(bh);
     422           0 :                                 continue;
     423             :                         }
     424             : 
     425             :                         /* A descriptor block: we can now write all of
     426             :                          * the data blocks.  Yay, useful work is finally
     427             :                          * getting done here! */
     428             : 
     429           0 :                         tagp = &bh->b_data[sizeof(journal_header_t)];
     430           0 :                         while ((tagp - bh->b_data +sizeof(journal_block_tag_t))
     431           0 :                                <= journal->j_blocksize) {
     432             :                                 unsigned int io_block;
     433           0 : 
     434           0 :                                 tag = (journal_block_tag_t *) tagp;
     435           0 :                                 flags = be32_to_cpu(tag->t_flags);
     436             : 
     437           0 :                                 io_block = next_log_block++;
     438           0 :                                 wrap(journal, next_log_block);
     439           0 :                                 err = jread(&obh, journal, io_block);
     440           0 :                                 if (err) {
     441             :                                         /* Recover what we can, but
     442             :                                          * report failure at the end. */
     443           0 :                                         success = err;
     444           0 :                                         printk (KERN_ERR
     445             :                                                 "JBD: IO error %d recovering "
     446             :                                                 "block %u in log\n",
     447             :                                                 err, io_block);
     448             :                                 } else {
     449             :                                         unsigned int blocknr;
     450             : 
     451           0 :                                         J_ASSERT(obh != NULL);
     452           0 :                                         blocknr = be32_to_cpu(tag->t_blocknr);
     453             : 
     454             :                                         /* If the block has been
     455             :                                          * revoked, then we're all done
     456             :                                          * here. */
     457           0 :                                         if (journal_test_revoke
     458             :                                             (journal, blocknr,
     459             :                                              next_commit_ID)) {
     460           0 :                                                 brelse(obh);
     461           0 :                                                 ++info->nr_revoke_hits;
     462           0 :                                                 goto skip_write;
     463             :                                         }
     464             : 
     465             :                                         /* Find a buffer for the new
     466             :                                          * data being restored */
     467           0 :                                         nbh = __getblk(journal->j_fs_dev,
     468             :                                                         blocknr,
     469             :                                                         journal->j_blocksize);
     470           0 :                                         if (nbh == NULL) {
     471           0 :                                                 printk(KERN_ERR
     472             :                                                        "JBD: Out of memory "
     473             :                                                        "during recovery.\n");
     474           0 :                                                 err = -ENOMEM;
     475           0 :                                                 brelse(bh);
     476           0 :                                                 brelse(obh);
     477           0 :                                                 goto failed;
     478             :                                         }
     479             : 
     480           0 :                                         lock_buffer(nbh);
     481           0 :                                         memcpy(nbh->b_data, obh->b_data,
     482             :                                                         journal->j_blocksize);
     483           0 :                                         if (flags & JFS_FLAG_ESCAPE) {
     484           0 :                                                 *((__be32 *)nbh->b_data) =
     485             :                                                 cpu_to_be32(JFS_MAGIC_NUMBER);
     486             :                                         }
     487             : 
     488             :                                         BUFFER_TRACE(nbh, "marking dirty");
     489           0 :                                         set_buffer_uptodate(nbh);
     490           0 :                                         mark_buffer_dirty(nbh);
     491             :                                         BUFFER_TRACE(nbh, "marking uptodate");
     492           0 :                                         ++info->nr_replays;
     493             :                                         /* ll_rw_block(WRITE, 1, &nbh); */
     494           0 :                                         unlock_buffer(nbh);
     495           0 :                                         brelse(obh);
     496           0 :                                         brelse(nbh);
     497             :                                 }
     498             : 
     499           0 :                         skip_write:
     500           0 :                                 tagp += sizeof(journal_block_tag_t);
     501           0 :                                 if (!(flags & JFS_FLAG_SAME_UUID))
     502           0 :                                         tagp += 16;
     503             : 
     504           0 :                                 if (flags & JFS_FLAG_LAST_TAG)
     505           0 :                                         break;
     506             :                         }
     507             : 
     508           0 :                         brelse(bh);
     509           0 :                         continue;
     510           0 : 
     511           0 :                 case JFS_COMMIT_BLOCK:
     512             :                         /* Found an expected commit block: not much to
     513             :                          * do other than move on to the next sequence
     514             :                          * number. */
     515           0 :                         brelse(bh);
     516           0 :                         next_commit_ID++;
     517           0 :                         continue;
     518           0 : 
     519           0 :                 case JFS_REVOKE_BLOCK:
     520             :                         /* If we aren't in the REVOKE pass, then we can
     521             :                          * just skip over this block. */
     522           0 :                         if (pass != PASS_REVOKE) {
     523           0 :                                 brelse(bh);
     524           0 :                                 continue;
     525             :                         }
     526             : 
     527           0 :                         err = scan_revoke_records(journal, bh,
     528             :                                                   next_commit_ID, info);
     529           0 :                         brelse(bh);
     530           0 :                         if (err)
     531           0 :                                 goto failed;
     532           0 :                         continue;
     533           0 : 
     534           0 :                 default:
     535           0 :                         jbd_debug(3, "Unrecognised magic %d, end of scan.\n",
     536             :                                   blocktype);
     537           0 :                         brelse(bh);
     538           0 :                         goto done;
     539             :                 }
     540           0 :         }
     541           0 : 
     542           0 :  done:
     543             :         /*
     544             :          * We broke out of the log scan loop: either we came to the
     545             :          * known end of the log or we found an unexpected block in the
     546             :          * log.  If the latter happened, then we know that the "current"
     547             :          * transaction marks the end of the valid log.
     548             :          */
     549             : 
     550           0 :         if (pass == PASS_SCAN)
     551           0 :                 info->end_transaction = next_commit_ID;
     552             :         else {
     553             :                 /* It's really bad news if different passes end up at
     554             :                  * different places (but possible due to IO errors). */
     555           0 :                 if (info->end_transaction != next_commit_ID) {
     556           0 :                         printk (KERN_ERR "JBD: recovery pass %d ended at "
     557             :                                 "transaction %u, expected %u\n",
     558             :                                 pass, next_commit_ID, info->end_transaction);
     559           0 :                         if (!success)
     560           0 :                                 success = -EIO;
     561             :                 }
     562             :         }
     563             : 
     564           0 :         return success;
     565           0 : 
     566             :  failed:
     567           0 :         return err;
     568             : }
     569             : 
     570             : 
     571             : /* Scan a revoke record, marking all blocks mentioned as revoked. */
     572             : 
     573             : static int scan_revoke_records(journal_t *journal, struct buffer_head *bh,
     574             :                                tid_t sequence, struct recovery_info *info)
     575             : {
     576           0 :         journal_revoke_header_t *header;
     577           0 :         int offset, max;
     578           0 : 
     579           0 :         header = (journal_revoke_header_t *) bh->b_data;
     580           0 :         offset = sizeof(journal_revoke_header_t);
     581           0 :         max = be32_to_cpu(header->r_count);
     582           0 : 
     583           0 :         while (offset < max) {
     584           0 :                 unsigned int blocknr;
     585           0 :                 int err;
     586             : 
     587           0 :                 blocknr = be32_to_cpu(* ((__be32 *) (bh->b_data+offset)));
     588           0 :                 offset += 4;
     589           0 :                 err = journal_set_revoke(journal, blocknr, sequence);
     590           0 :                 if (err)
     591           0 :                         return err;
     592           0 :                 ++info->nr_revokes;
     593           0 :         }
     594           0 :         return 0;
     595             : }

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