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Subject[patch 8/8] inode-diet: Fix size of i_blkbits, i_version, and i_dnotify_mask
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" <>

Index: linux-2.6.17-mm5/include/linux/fs.h
--- linux-2.6.17-mm5.orig/include/linux/fs.h 2006-07-02 20:29:52.000000000 -0400
+++ linux-2.6.17-mm5/include/linux/fs.h 2006-07-02 20:29:55.000000000 -0400
@@ -498,6 +498,7 @@
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;
@@ -505,8 +506,7 @@
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;
@@ -538,7 +538,7 @@
__u32 i_generation;

- unsigned long i_dnotify_mask; /* Directory notify events */
+ unsigned int i_dnotify_mask; /* Directory notify events */
struct dnotify_struct *i_dnotify; /* for directory notifications */

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