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Btrfs: fix that repair code is spuriously executed for transid failures

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If verify_parent_transid() fails for all mirrors, the current code
calls repair_io_failure() anyway which means:
- that the disk block is rewritten without repairing anything and
- that a kernel log message is printed which misleadingly claims
  that a read error was corrected.

This is an example:
parent transid verify failed on 615015833600 wanted 110423 found 110424
parent transid verify failed on 615015833600 wanted 110423 found 110424
btrfs read error corrected: ino 1 off 615015833600 (dev /dev/...)

It is wrong to ignore the results from verify_parent_transid() and to
call repair_eb_io_failure() when the verification of the transids failed.
This commit fixes the issue.

Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Stefan Behrens 2012-08-10 08:58:21 -06:00 committed by Chris Mason
parent d280e5be94
commit 256dd1bb37
1 changed files with 6 additions and 2 deletions
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8
fs/btrfs/disk-io.c
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@ -377,9 +377,13 @@ static int btree_read_extent_buffer_pages(struct btrfs_root *root,
ret = read_extent_buffer_pages(io_tree, eb, start,
WAIT_COMPLETE,
btree_get_extent, mirror_num);
if (!ret && !verify_parent_transid(io_tree, eb,
if (!ret) {
if (!verify_parent_transid(io_tree, eb,
parent_transid, 0))
break;
break;
else
ret = -EIO;
}
/*
* This buffer's crc is fine, but its contents are corrupted, so