btrfs: remove check for impossible block start for an extent map at fiemap

During fiemap we are testing if an extent map has a block start with a
value of EXTENT_MAP_LAST_BYTE, but that is never set on an extent map,
and never was according to git history. So remove that useless check.

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 591c191..b5fa927 100644 (file)
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -5571,10 +5571,7 @@ int extent_fiemap(struct btrfs_inode *inode, struct fiemap_extent_info *fieinfo,
                if (off >= max)
                        end = 1;
 
-               if (em->block_start == EXTENT_MAP_LAST_BYTE) {
-                       end = 1;
-                       flags |= FIEMAP_EXTENT_LAST;
-               } else if (em->block_start == EXTENT_MAP_INLINE) {
+               if (em->block_start == EXTENT_MAP_INLINE) {
                        flags |= (FIEMAP_EXTENT_DATA_INLINE |
                                  FIEMAP_EXTENT_NOT_ALIGNED);
                } else if (em->block_start == EXTENT_MAP_DELALLOC) {