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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/debugfs/file.c
parent6a1d9805ec506d8b9d04450997707da5f643d87c (diff)
[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/debugfs/file.c')
-rw-r--r--fs/debugfs/file.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/debugfs/file.c b/fs/debugfs/file.c
index e4b430552c8..bf3901ab174 100644
--- a/fs/debugfs/file.c
+++ b/fs/debugfs/file.c
@@ -32,8 +32,8 @@ static ssize_t default_write_file(struct file *file, const char __user *buf,
static int default_open(struct inode *inode, struct file *file)
{
- if (inode->u.generic_ip)
- file->private_data = inode->u.generic_ip;
+ if (inode->i_private)
+ file->private_data = inode->i_private;
return 0;
}