Currently btrfs_inode have size equal 1136 bytes. (On x86_64).
struct btrfs_inode store several vars releated to compression code,
all states use 1 or 2 bits.
Lets declare bitfields for compression releated vars, to reduce
sizeof btrfs_inode to 1128 bytes.
Signed-off-by: Timofey Titovets <nefelim...@gmail.com>
---
fs/btrfs/btrfs_inode.h | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/fs/btrfs/btrfs_inode.h b/fs/btrfs/btrfs_inode.h
index 9eb0c92ee4b4..9d29d7e68757 100644
--- a/fs/btrfs/btrfs_inode.h
+++ b/fs/btrfs/btrfs_inode.h
@@ -181,13 +181,13 @@ struct btrfs_inode {
/*
* Cached values of inode properties
*/
- unsigned prop_compress; /* per-file compression algorithm */
+ unsigned prop_compress : 2; /* per-file compression algorithm */
/*
* Force compression on the file using the defrag ioctl, could be
* different from prop_compress and takes precedence if set
*/
- unsigned defrag_compress;
- unsigned change_compress;
+ unsigned defrag_compress : 2;
+ unsigned change_compress : 1;
struct btrfs_delayed_node *delayed_node;
--
2.15.1
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