[RFC] [PATCH 8/8] inode-diet: Fix size of i_blkbits, i_version, and i_dnotify_mask

[Theodore Tso]

i_blkbits stores the log n of the blocksize; there is no reason for it
to take more than 16 bits, so change it to be a short and put it next
to i_mode.

i_version and i_dnotify_mask need to be 32 bits, but there is no
reason for them to be 64-bit values on 64-bit architectures, so make
them be unsigned int's instead of unsigned long's.

Signed-off-by: "Theodore Ts'o" <tytso@xxxxxxx>

Index: linux-2.6.17/include/linux/fs.h
===================================================================
--- linux-2.6.17.orig/include/linux/fs.h	2006-06-19 07:29:36.000000000 -0400
+++ linux-2.6.17/include/linux/fs.h	2006-06-19 07:48:02.000000000 -0400
@@ -483,6 +483,7 @@
 	unsigned long		i_ino;
 	atomic_t		i_count;
 	umode_t			i_mode;
+	unsigned short		i_blkbits;
 	unsigned int		i_nlink;
 	uid_t			i_uid;
 	gid_t			i_gid;
@@ -490,8 +491,7 @@
 	struct timespec		i_atime;
 	struct timespec		i_mtime;
 	struct timespec		i_ctime;
-	unsigned int		i_blkbits;
-	unsigned long		i_version;
+	unsigned int		i_version;
 	spinlock_t		i_lock;	/* i_blocks, i_bytes, maybe i_size */
 	struct mutex		i_mutex;
 	struct rw_semaphore	i_alloc_sem;
@@ -523,7 +523,7 @@
 	__u32			i_generation;
 
 #ifdef CONFIG_DNOTIFY
-	unsigned long		i_dnotify_mask; /* Directory notify events */
+	unsigned int		i_dnotify_mask; /* Directory notify events */
 	struct dnotify_struct	*i_dnotify; /* for directory notifications */
 #endif
 

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