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authorBrian Foster <bfoster@redhat.com>2016-03-07 00:22:22 +0300
committerDave Chinner <david@fromorbit.com>2016-03-07 00:22:22 +0300
commit717bc0ebca0bce9cb3edfc31b49b384a1d55db1c (patch)
treef6d78b56611b3bf7265abb973963ec3627b18c02 /fs/xfs/xfs_log_recover.c
parent65b99a08b350876e8835fc0e7173598165f64dee (diff)
downloadlinux-717bc0ebca0bce9cb3edfc31b49b384a1d55db1c.tar.xz
xfs: refactor in-core log state update to helper
Once the record at the head of the log is identified and verified, the in-core log state is updated based on the record. This includes information such as the current head block and cycle, the start block of the last record written to the log, the tail lsn, etc. Once torn write detection is conditional, this logic will need to be reused. Factor the code to update the in-core log data structures into a new helper function. This patch does not change behavior. Signed-off-by: Brian Foster <bfoster@redhat.com> Reviewed-by: Dave Chinner <dchinner@redhat.com> Signed-off-by: Dave Chinner <david@fromorbit.com>
Diffstat (limited to 'fs/xfs/xfs_log_recover.c')
-rw-r--r--fs/xfs/xfs_log_recover.c52
1 files changed, 33 insertions, 19 deletions
diff --git a/fs/xfs/xfs_log_recover.c b/fs/xfs/xfs_log_recover.c
index 1aae75608453..9ac8aa8dc38c 100644
--- a/fs/xfs/xfs_log_recover.c
+++ b/fs/xfs/xfs_log_recover.c
@@ -1276,6 +1276,37 @@ xlog_check_unmount_rec(
return 0;
}
+static void
+xlog_set_state(
+ struct xlog *log,
+ xfs_daddr_t head_blk,
+ struct xlog_rec_header *rhead,
+ xfs_daddr_t rhead_blk,
+ bool bump_cycle)
+{
+ /*
+ * Reset log values according to the state of the log when we
+ * crashed. In the case where head_blk == 0, we bump curr_cycle
+ * one because the next write starts a new cycle rather than
+ * continuing the cycle of the last good log record. At this
+ * point we have guaranteed that all partial log records have been
+ * accounted for. Therefore, we know that the last good log record
+ * written was complete and ended exactly on the end boundary
+ * of the physical log.
+ */
+ log->l_prev_block = rhead_blk;
+ log->l_curr_block = (int)head_blk;
+ log->l_curr_cycle = be32_to_cpu(rhead->h_cycle);
+ if (bump_cycle)
+ log->l_curr_cycle++;
+ atomic64_set(&log->l_tail_lsn, be64_to_cpu(rhead->h_tail_lsn));
+ atomic64_set(&log->l_last_sync_lsn, be64_to_cpu(rhead->h_lsn));
+ xlog_assign_grant_head(&log->l_reserve_head.grant, log->l_curr_cycle,
+ BBTOB(log->l_curr_block));
+ xlog_assign_grant_head(&log->l_write_head.grant, log->l_curr_cycle,
+ BBTOB(log->l_curr_block));
+}
+
/*
* Find the sync block number or the tail of the log.
*
@@ -1356,26 +1387,9 @@ xlog_find_tail(
goto done;
/*
- * Reset log values according to the state of the log when we
- * crashed. In the case where head_blk == 0, we bump curr_cycle
- * one because the next write starts a new cycle rather than
- * continuing the cycle of the last good log record. At this
- * point we have guaranteed that all partial log records have been
- * accounted for. Therefore, we know that the last good log record
- * written was complete and ended exactly on the end boundary
- * of the physical log.
+ * Set the log state based on the current head record.
*/
- log->l_prev_block = rhead_blk;
- log->l_curr_block = (int)*head_blk;
- log->l_curr_cycle = be32_to_cpu(rhead->h_cycle);
- if (wrapped)
- log->l_curr_cycle++;
- atomic64_set(&log->l_tail_lsn, be64_to_cpu(rhead->h_tail_lsn));
- atomic64_set(&log->l_last_sync_lsn, be64_to_cpu(rhead->h_lsn));
- xlog_assign_grant_head(&log->l_reserve_head.grant, log->l_curr_cycle,
- BBTOB(log->l_curr_block));
- xlog_assign_grant_head(&log->l_write_head.grant, log->l_curr_cycle,
- BBTOB(log->l_curr_block));
+ xlog_set_state(log, *head_blk, rhead, rhead_blk, wrapped);
tail_lsn = atomic64_read(&log->l_tail_lsn);
/*