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btrfs-progs: check: lowmem: Fix extent item size false alert

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If one extent item has no inline ref, btrfs lowmem mode check can give
false alert without outputting any error message.

The problem is lowmem mode always assumes that extent item has inline
refs, and when it encounters such case it flags the extent item has
wrong size, but doesn't output the error message.

Although we already have such image submitted, at the commit time due to
another bug in cmds-check return value, it doesn't detect it until that
bug is fixed.

Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo 2017-02-21 16:34:30 +08:00 committed by David Sterba
parent eec058075f
commit 4a749360cd
1 changed files with 10 additions and 4 deletions
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14
cmds-check.c
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@ -10743,13 +10743,20 @@ static int check_extent_item(struct btrfs_fs_info *fs_info,
}
end = (unsigned long)ei + item_size;
if (ptr >= end) {
next:
/* Reached extent item end normally */
if (ptr == end)
goto out;
/* Beyond extent item end, wrong item size */
if (ptr > end) {
err |= ITEM_SIZE_MISMATCH;
error("extent item at bytenr %llu slot %d has wrong size",
eb->start, slot);
goto out;
}
/* Now check every backref in this extent item */
next:
iref = (struct btrfs_extent_inline_ref *)ptr;
type = btrfs_extent_inline_ref_type(eb, iref);
offset = btrfs_extent_inline_ref_offset(eb, iref);
@ -10786,8 +10793,7 @@ next:
}
ptr += btrfs_extent_inline_ref_size(type);
if (ptr < end)
goto next;
goto next;
out:
return err;