failed to apply patch:
checking file fs/btrfs/extent_map.c
Hunk #1 FAILED at 262.
Hunk #2 succeeded at 493 (offset 100 lines).
Hunk #3 succeeded at 747 (offset 100 lines).
1 out of 3 hunks FAILED
checking file fs/btrfs/inode.c
Hunk #1 succeeded at 6958 (offset -14 lines).