Issue #622 reported a case where ntfs2btrfs can generate out-of-order
inline backref items, which can lead to kernel transaction abort, but
not detected by btrfs-check.
This patch would add such image, whose extent tree looks like this for
the only data extent:
item 0 key (13631488 EXTENT_ITEM 4096) itemoff 16172 itemsize 111
refs 3 gen 7 flags DATA
(178 0xdfb591fa80d95ea) extent data backref root FS_TREE objectid 257 offset 0 count 1
(178 0xdfb591fbbf5f519) extent data backref root FS_TREE objectid 258 offset 0 count 1
(178 0xdfb591f49f9f8e7) extent data backref root FS_TREE objectid 259 offset 0 count 1
While the original good base image has the following backrefs for the
same data extent:
item 0 key (13631488 EXTENT_ITEM 4096) itemoff 16172 itemsize 111
refs 3 gen 7 flags DATA
(178 0xdfb591fbbf5f519) extent data backref root FS_TREE objectid 258 offset 0 count 1
(178 0xdfb591fa80d95ea) extent data backref root FS_TREE objectid 257 offset 0 count 1
(178 0xdfb591f49f9f8e7) extent data backref root FS_TREE objectid 259 offset 0 count 1
Notice the sequence (the 2nd number in the round brackets) should be
descending. (Meanwhile type should be ascending, but it's way harder to
create.)
For now we don't have a way to fix it, but at least we should detect it.
Issue: #622
Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
