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authorTheodore Ts'o <tytso@mit.edu>2006-09-27 01:50:46 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-09-27 08:26:17 -0700
commit8e18e2941c53416aa219708e7dcad21fb4bd6794 (patch)
tree44118f8b09556193ac93e0b71aecfa3e1d4bc182 /fs/freevxfs
parent6a1d9805ec506d8b9d04450997707da5f643d87c (diff)
downloadlinux-linaro-8e18e2941c53416aa219708e7dcad21fb4bd6794.tar.gz
[PATCH] inode_diet: Replace inode.u.generic_ip with inode.i_private
The following patches reduce the size of the VFS inode structure by 28 bytes on a UP x86. (It would be more on an x86_64 system). This is a 10% reduction in the inode size on a UP kernel that is configured in a production mode (i.e., with no spinlock or other debugging functions enabled; if you want to save memory taken up by in-core inodes, the first thing you should do is disable the debugging options; they are responsible for a huge amount of bloat in the VFS inode structure). This patch: The filesystem or device-specific pointer in the inode is inside a union, which is pretty pointless given that all 30+ users of this field have been using the void pointer. Get rid of the union and rename it to i_private, with a comment to explain who is allowed to use the void pointer. This is just a cleanup, but it allows us to reuse the union 'u' for something something where the union will actually be used. [judith@osdl.org: powerpc build fix] Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Signed-off-by: Judith Lebzelter <judith@osdl.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs/freevxfs')
-rw-r--r--fs/freevxfs/vxfs.h2
-rw-r--r--fs/freevxfs/vxfs_inode.c4
2 files changed, 3 insertions, 3 deletions
diff --git a/fs/freevxfs/vxfs.h b/fs/freevxfs/vxfs.h
index d35979a5874..c8a92652612 100644
--- a/fs/freevxfs/vxfs.h
+++ b/fs/freevxfs/vxfs.h
@@ -252,7 +252,7 @@ enum {
* Get filesystem private data from VFS inode.
*/
#define VXFS_INO(ip) \
- ((struct vxfs_inode_info *)(ip)->u.generic_ip)
+ ((struct vxfs_inode_info *)(ip)->i_private)
/*
* Get filesystem private data from VFS superblock.
diff --git a/fs/freevxfs/vxfs_inode.c b/fs/freevxfs/vxfs_inode.c
index ca6a3971477..32a82ed108e 100644
--- a/fs/freevxfs/vxfs_inode.c
+++ b/fs/freevxfs/vxfs_inode.c
@@ -243,7 +243,7 @@ vxfs_iinit(struct inode *ip, struct vxfs_inode_info *vip)
ip->i_blocks = vip->vii_blocks;
ip->i_generation = vip->vii_gen;
- ip->u.generic_ip = (void *)vip;
+ ip->i_private = vip;
}
@@ -338,5 +338,5 @@ vxfs_read_inode(struct inode *ip)
void
vxfs_clear_inode(struct inode *ip)
{
- kmem_cache_free(vxfs_inode_cachep, ip->u.generic_ip);
+ kmem_cache_free(vxfs_inode_cachep, ip->i_private);
}