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Subject[PATCH 4/4] sysfs: Kill nlink counting.

Tracking the number of subdirectories requires an extra field that increases
the size of sysfs_dirent. nlinks are not particularly interesting for sysfs
and the nlink counts are wrong when network namespaces are involved so stop
counting them, and always return nlink == 1. Userspace already knows that
directories with nlink == 1 have an nlink count they can't use to count
subdirectories.

This reduces the size of sysfs_dirent by 8 bytes on 64bit platforms.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
---
fs/sysfs/dir.c | 6 ------
fs/sysfs/inode.c | 3 ---
fs/sysfs/sysfs.h | 1 -
3 files changed, 0 insertions(+), 10 deletions(-)
diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c
index 0589c9a..ea64d01 100644
--- a/fs/sysfs/dir.c
+++ b/fs/sysfs/dir.c
@@ -91,9 +91,6 @@ static int sysfs_link_sibling(struct sysfs_dirent *sd)
struct rb_node **node = &sd->s_parent->s_dir.children.rb_node;
struct rb_node *parent = NULL;

- if (sysfs_type(sd) == SYSFS_DIR)
- sd->s_parent->s_dir.subdirs++;
-
while (*node) {
struct sysfs_dirent *pos;
int result;
@@ -126,9 +123,6 @@ static int sysfs_link_sibling(struct sysfs_dirent *sd)
*/
static void sysfs_unlink_sibling(struct sysfs_dirent *sd)
{
- if (sysfs_type(sd) == SYSFS_DIR)
- sd->s_parent->s_dir.subdirs--;
-
rb_erase(&sd->s_rb, &sd->s_parent->s_dir.children);
}

diff --git a/fs/sysfs/inode.c b/fs/sysfs/inode.c
index c81b22f..c7be716 100644
--- a/fs/sysfs/inode.c
+++ b/fs/sysfs/inode.c
@@ -216,9 +216,6 @@ static void sysfs_refresh_inode(struct sysfs_dirent *sd, struct inode *inode)
iattrs->ia_secdata,
iattrs->ia_secdata_len);
}
-
- if (sysfs_type(sd) == SYSFS_DIR)
- set_nlink(inode, sd->s_dir.subdirs + 2);
}

int sysfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
diff --git a/fs/sysfs/sysfs.h b/fs/sysfs/sysfs.h
index 3f23061..2adb052 100644
--- a/fs/sysfs/sysfs.h
+++ b/fs/sysfs/sysfs.h
@@ -19,7 +19,6 @@ struct sysfs_open_dirent;
struct sysfs_elem_dir {
struct kobject *kobj;

- unsigned long subdirs;
/* children rbtree starts here and goes through sd->s_rb */
struct rb_root children;
};
--
1.7.2.5


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