Btrfs: shrink further sizeof(struct extent_buffer)

The map_start and map_len fields aren't used anywhere, so just remove
them. On a x86_64 system, this reduced sizeof(struct extent_buffer)
from 296 bytes to 280 bytes, and therefore 14 extent_buffer structs can
now fit into a page instead of 13.

Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <clm@fb.com>

1 files changed, 0 insertions, 2 deletions

diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h
index 1f608166fe67..844b4c5029cd 100644
--- a/fs/btrfs/extent_io.h
+++ b/fs/btrfs/extent_io.h
@@ -125,8 +125,6 @@ struct extent_state {
 struct extent_buffer {
         u64 start;
         unsigned long len;
-        unsigned long map_start;
-        unsigned long map_len;
         unsigned long bflags;
         struct btrfs_fs_info *fs_info;
         spinlock_t refs_lock;