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Btrfs: shrink further sizeof(struct extent_buffer)

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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>
This commit is contained in:
Filipe Manana 2014-08-14 12:25:14 +01:00 • committed by Chris Mason
parent 4395e0c4da
commit 2a39e59802
1 changed files with 0 additions and 2 deletions
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2
fs/btrfs/extent_io.h
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@ -125,8 +125,6 @@ struct extent_state {
struct extent_buffer { struct extent_buffer {
u64 start; u64 start;
unsigned long len; unsigned long len;
unsigned long map_start;
unsigned long map_len;
unsigned long bflags; unsigned long bflags;
struct btrfs_fs_info *fs_info; struct btrfs_fs_info *fs_info;
spinlock_t refs_lock; spinlock_t refs_lock;