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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 /include/linux/fs.h
parent6a1d9805ec506d8b9d04450997707da5f643d87c (diff)
downloadop-kernel-dev-8e18e2941c53416aa219708e7dcad21fb4bd6794.zip
op-kernel-dev-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 'include/linux/fs.h')
-rw-r--r--include/linux/fs.h4
1 files changed, 1 insertions, 3 deletions
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 1d3e601..4f77ec9 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -554,9 +554,7 @@ struct inode {
atomic_t i_writecount;
void *i_security;
- union {
- void *generic_ip;
- } u;
+ void *i_private; /* fs or device private pointer */
#ifdef __NEED_I_SIZE_ORDERED
seqcount_t i_size_seqcount;
#endif
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