From bba9dfd83587017de1c55a94c077983e0dfa0251 Mon Sep 17 00:00:00 2001 From: Theodore Ts'o Date: Wed, 27 Sep 2006 01:50:31 -0700 Subject: [PATCH] [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" Cc: Steven Whitehouse Signed-off-by: Andrew Morton --- fs/dlm/debug_fs.c | 4 ++-- fs/gfs2/inode.c | 2 +- fs/gfs2/meta_io.c | 2 +- fs/gfs2/ops_super.c | 6 +++--- 4 files changed, 7 insertions(+), 7 deletions(-) diff --git a/fs/dlm/debug_fs.c b/fs/dlm/debug_fs.c index 9c3aeddc8667..ca94a837a5bb 100644 --- a/fs/dlm/debug_fs.c +++ b/fs/dlm/debug_fs.c @@ -282,7 +282,7 @@ static int rsb_open(struct inode *inode, struct file *file) return ret; seq = file->private_data; - seq->private = inode->u.generic_ip; + seq->private = inode->i_private; return 0; } @@ -301,7 +301,7 @@ static struct file_operations rsb_fops = { static int waiters_open(struct inode *inode, struct file *file) { - file->private_data = inode->u.generic_ip; + file->private_data = inode->i_private; return 0; } diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c index ac9535be304f..784d145058cb 100644 --- a/fs/gfs2/inode.c +++ b/fs/gfs2/inode.c @@ -160,7 +160,7 @@ struct inode *gfs2_inode_lookup(struct super_block *sb, struct gfs2_inum *inum, if (inode->i_state & I_NEW) { struct gfs2_sbd *sdp = GFS2_SB(inode); umode_t mode = DT2IF(type); - inode->u.generic_ip = ip; + inode->i_private = ip; inode->i_mode = mode; if (S_ISREG(mode)) { diff --git a/fs/gfs2/meta_io.c b/fs/gfs2/meta_io.c index d3708af0a4d1..731799153187 100644 --- a/fs/gfs2/meta_io.c +++ b/fs/gfs2/meta_io.c @@ -78,7 +78,7 @@ struct inode *gfs2_aspace_get(struct gfs2_sbd *sdp) mapping_set_gfp_mask(aspace->i_mapping, GFP_NOFS); aspace->i_mapping->a_ops = &aspace_aops; aspace->i_size = ~0ULL; - aspace->u.generic_ip = NULL; + aspace->i_private = NULL; insert_inode_hash(aspace); } return aspace; diff --git a/fs/gfs2/ops_super.c b/fs/gfs2/ops_super.c index 8cfda6452139..06f06f7773d0 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);