Btrfs: fix unexpected return value of fiemap
btrfs's fiemap is supposed to return 0 on success and return < 0 on
error. however, ret becomes 1 after looking up the last file extent:
btrfs_lookup_file_extent ->
btrfs_search_slot(..., ins_len=0, cow=0)
and if the offset is beyond EOF, we'll get 'path' pointed to the place
of potentail insertion, and ret == 1.
This may confuse applications using ioctl(FIEL_IOC_FIEMAP).
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
1 file changed