diff options
| -rw-r--r-- | fs/xfs/xfs_log_recover.c | 153 |
1 files changed, 93 insertions, 60 deletions
diff --git a/fs/xfs/xfs_log_recover.c b/fs/xfs/xfs_log_recover.c index c2d04ff8876b..1aae75608453 100644 --- a/fs/xfs/xfs_log_recover.c +++ b/fs/xfs/xfs_log_recover.c @@ -1199,6 +1199,84 @@ xlog_verify_head( } /* + * Check whether the head of the log points to an unmount record. In other + * words, determine whether the log is clean. If so, update the in-core state + * appropriately. + */ +static int +xlog_check_unmount_rec( + struct xlog *log, + xfs_daddr_t *head_blk, + xfs_daddr_t *tail_blk, + struct xlog_rec_header *rhead, + xfs_daddr_t rhead_blk, + struct xfs_buf *bp, + bool *clean) +{ + struct xlog_op_header *op_head; + xfs_daddr_t umount_data_blk; + xfs_daddr_t after_umount_blk; + int hblks; + int error; + char *offset; + + *clean = false; + + /* + * Look for unmount record. If we find it, then we know there was a + * clean unmount. Since 'i' could be the last block in the physical + * log, we convert to a log block before comparing to the head_blk. + * + * Save the current tail lsn to use to pass to xlog_clear_stale_blocks() + * below. We won't want to clear the unmount record if there is one, so + * we pass the lsn of the unmount record rather than the block after it. + */ + if (xfs_sb_version_haslogv2(&log->l_mp->m_sb)) { + int h_size = be32_to_cpu(rhead->h_size); + int h_version = be32_to_cpu(rhead->h_version); + + if ((h_version & XLOG_VERSION_2) && + (h_size > XLOG_HEADER_CYCLE_SIZE)) { + hblks = h_size / XLOG_HEADER_CYCLE_SIZE; + if (h_size % XLOG_HEADER_CYCLE_SIZE) + hblks++; + } else { + hblks = 1; + } + } else { + hblks = 1; + } + after_umount_blk = rhead_blk + hblks + BTOBB(be32_to_cpu(rhead->h_len)); + after_umount_blk = do_mod(after_umount_blk, log->l_logBBsize); + if (*head_blk == after_umount_blk && + be32_to_cpu(rhead->h_num_logops) == 1) { + umount_data_blk = rhead_blk + hblks; + umount_data_blk = do_mod(umount_data_blk, log->l_logBBsize); + error = xlog_bread(log, umount_data_blk, 1, bp, &offset); + if (error) + return error; + + op_head = (struct xlog_op_header *)offset; + if (op_head->oh_flags & XLOG_UNMOUNT_TRANS) { + /* + * Set tail and last sync so that newly written log + * records will point recovery to after the current + * unmount record. + */ + xlog_assign_atomic_lsn(&log->l_tail_lsn, + log->l_curr_cycle, after_umount_blk); + xlog_assign_atomic_lsn(&log->l_last_sync_lsn, + log->l_curr_cycle, after_umount_blk); + *tail_blk = after_umount_blk; + + *clean = true; + } + } + + return 0; +} + +/* * Find the sync block number or the tail of the log. * * This will be the block number of the last record to have its @@ -1221,16 +1299,13 @@ xlog_find_tail( xfs_daddr_t *tail_blk) { xlog_rec_header_t *rhead; - xlog_op_header_t *op_head; char *offset = NULL; xfs_buf_t *bp; int error; - xfs_daddr_t umount_data_blk; - xfs_daddr_t after_umount_blk; xfs_daddr_t rhead_blk; xfs_lsn_t tail_lsn; - int hblks; bool wrapped = false; + bool clean = false; /* * Find previous log record @@ -1301,66 +1376,24 @@ xlog_find_tail( BBTOB(log->l_curr_block)); xlog_assign_grant_head(&log->l_write_head.grant, log->l_curr_cycle, BBTOB(log->l_curr_block)); + tail_lsn = atomic64_read(&log->l_tail_lsn); /* - * Look for unmount record. If we find it, then we know there - * was a clean unmount. Since 'i' could be the last block in - * the physical log, we convert to a log block before comparing - * to the head_blk. - * - * Save the current tail lsn to use to pass to - * xlog_clear_stale_blocks() below. We won't want to clear the - * unmount record if there is one, so we pass the lsn of the - * unmount record rather than the block after it. + * Look for an unmount record at the head of the log. This sets the log + * state to determine whether recovery is necessary. */ - if (xfs_sb_version_haslogv2(&log->l_mp->m_sb)) { - int h_size = be32_to_cpu(rhead->h_size); - int h_version = be32_to_cpu(rhead->h_version); - - if ((h_version & XLOG_VERSION_2) && - (h_size > XLOG_HEADER_CYCLE_SIZE)) { - hblks = h_size / XLOG_HEADER_CYCLE_SIZE; - if (h_size % XLOG_HEADER_CYCLE_SIZE) - hblks++; - } else { - hblks = 1; - } - } else { - hblks = 1; - } - after_umount_blk = rhead_blk + hblks + BTOBB(be32_to_cpu(rhead->h_len)); - after_umount_blk = do_mod(after_umount_blk, log->l_logBBsize); - tail_lsn = atomic64_read(&log->l_tail_lsn); - if (*head_blk == after_umount_blk && - be32_to_cpu(rhead->h_num_logops) == 1) { - umount_data_blk = rhead_blk + hblks; - umount_data_blk = do_mod(umount_data_blk, log->l_logBBsize); - error = xlog_bread(log, umount_data_blk, 1, bp, &offset); - if (error) - goto done; - - op_head = (xlog_op_header_t *)offset; - if (op_head->oh_flags & XLOG_UNMOUNT_TRANS) { - /* - * Set tail and last sync so that newly written - * log records will point recovery to after the - * current unmount record. - */ - xlog_assign_atomic_lsn(&log->l_tail_lsn, - log->l_curr_cycle, after_umount_blk); - xlog_assign_atomic_lsn(&log->l_last_sync_lsn, - log->l_curr_cycle, after_umount_blk); - *tail_blk = after_umount_blk; + error = xlog_check_unmount_rec(log, head_blk, tail_blk, rhead, + rhead_blk, bp, &clean); + if (error) + goto done; - /* - * Note that the unmount was clean. If the unmount - * was not clean, we need to know this to rebuild the - * superblock counters from the perag headers if we - * have a filesystem using non-persistent counters. - */ - log->l_mp->m_flags |= XFS_MOUNT_WAS_CLEAN; - } - } + /* + * Note that the unmount was clean. If the unmount was not clean, we + * need to know this to rebuild the superblock counters from the perag + * headers if we have a filesystem using non-persistent counters. + */ + if (clean) + log->l_mp->m_flags |= XFS_MOUNT_WAS_CLEAN; /* * Make sure that there are no blocks in front of the head |