[PATCH] reduce size of struct inode on 64bit

[PATCH] reduce size of struct inode on 64bit

Reduce the size of struct inode on 64bit architectures by reducing padding.
This assumes spinlocks are 32bit or less which is the case on most
architectures.

This reduces inode structs by 24 bytes on ppc64, and on ext2 increases the
number of inodes in a 4kB slab from 5 to 6.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>