While scrubbing superblocks we will check every superblock's checksum
and generation. However, checking superblock's generation may cause
some problems, this is because tree log sync only flush first superblock
, while this will cause other superblocks' generation mismatch.
We only report superblock generation mismatch if it is first superblock
or we make sure we are not doing tree log.
Reported-by: Sebastian Ochmann <ochmann@xxxxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Wang Shilong <wangsl.fnst@xxxxxxxxxxxxxx>
Reviewed-by: Miao Xie <miaox@xxxxxxxxxxxxxx>
---
fs/btrfs/scrub.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c
index 2544805..b29a91f 100644
--- a/fs/btrfs/scrub.c
+++ b/fs/btrfs/scrub.c
@@ -1794,8 +1794,15 @@ static int scrub_checksum_super(struct scrub_block *sblock)
if (sblock->pagev[0]->logical != btrfs_super_bytenr(s))
++fail_cor;
- if (sblock->pagev[0]->generation != btrfs_super_generation(s))
- ++fail_gen;
+ if (sblock->pagev[0]->generation != btrfs_super_generation(s)) {
+ /*
+ * we only report a generation mismatch if this is first
+ * superblock or we can make sure we are not doing tree log.
+ */
+ if (btrfs_super_bytenr(s) == btrfs_sb_offset(0) ||
+ !root->fs_info->log_root_tree)
+ ++fail_gen;
+ }
if (memcmp(s->fsid, fs_info->fsid, BTRFS_UUID_SIZE))
++fail_cor;
--
1.8.3.1
--
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