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| author | Theodore Ts'o <tytso@mit.edu> | 2006-09-27 01:50:31 -0700 |
|---|---|---|
| committer | Steven Whitehouse <swhiteho@redhat.com> | 2006-09-28 08:32:24 -0400 |
| commit | bba9dfd83587017de1c55a94c077983e0dfa0251 (patch) | |
| tree | 8af76134269374850dea490ee1020cb92f4fdb9b /fs/gfs2/ops_super.c | |
| parent | 185a257f2f73bcd89050ad02da5bedbc28fc43fa (diff) | |
| download | linux-bba9dfd83587017de1c55a94c077983e0dfa0251.tar.gz | |
[GFS2] inode_diet: Replace inode.u.generic_ip with inode.i_private (gfs)
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.
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: Steven Whitehouse <swhiteho@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Diffstat (limited to 'fs/gfs2/ops_super.c')
| -rw-r--r-- | fs/gfs2/ops_super.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/fs/gfs2/ops_super.c b/fs/gfs2/ops_super.c index 8cfda64521393f..06f06f7773d044 100644 --- a/fs/gfs2/ops_super.c +++ b/fs/gfs2/ops_super.c @@ -53,7 +53,7 @@ static int gfs2_write_inode(struct inode *inode, int sync) struct gfs2_inode *ip = GFS2_I(inode); /* Check this is a "normal" inode */ - if (inode->u.generic_ip) { + if (inode->i_private) { if (current->flags & PF_MEMALLOC) return 0; if (sync) @@ -280,7 +280,7 @@ static void gfs2_clear_inode(struct inode *inode) * serves to contain an address space (see rgrp.c, meta_io.c) * which therefore doesn't have its own glocks. */ - if (inode->u.generic_ip) { + if (inode->i_private) { struct gfs2_inode *ip = GFS2_I(inode); gfs2_glock_inode_squish(inode); gfs2_assert(inode->i_sb->s_fs_info, ip->i_gl->gl_state == LM_ST_UNLOCKED); @@ -381,7 +381,7 @@ static void gfs2_delete_inode(struct inode *inode) struct gfs2_holder gh; int error; - if (!inode->u.generic_ip) + if (!inode->i_private) goto out; error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE, &gh); |