[PATCH] fs: shave 8 bytes off of struct inode

[Amir Goldstein <amir73il@xxxxxxxxx>]

Signed-off-by: Amir Goldstein <amir73il@xxxxxxxxx>
---

Linus,

I tried to find some space to cram i_generation in case
I get rid of i_fsnotify_mask, but stumbled on a possible
"lossless compression".

Any caveats with this change?

Thanks,
Amir.

 include/linux/fs.h | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 760d8da1b6c7..6d0489613dc1 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -274,6 +274,7 @@ struct writeback_control;
 
 /*
  * Write life time hint values.
+ * Stored in struct inode as u8.
  */
 enum rw_hint {
 	WRITE_LIFE_NOT_SET	= 0,
@@ -607,8 +608,8 @@ struct inode {
 	struct timespec		i_ctime;
 	spinlock_t		i_lock;	/* i_blocks, i_bytes, maybe i_size */
 	unsigned short          i_bytes;
-	unsigned int		i_blkbits;
-	enum rw_hint		i_write_hint;
+	u8			i_blkbits;
+	u8			i_write_hint;
 	blkcnt_t		i_blocks;
 
 #ifdef __NEED_I_SIZE_ORDERED
-- 
2.7.4