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>

diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h
index 1f60816..844b4c5 100644 (file)
--- 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;