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sysfs, kernfs: introduce sysfs_root_sd 

Currently, it's assumed that there's a single kernfs hierarchy in the
system anchored at sysfs_root which is defined as a global struct.  To
allow other users of kernfs, this will be made dynamic.  Introduce a
new global variable sysfs_root_sd which points to &sysfs_root and
convert all &sysfs_root users.

This patch doesn't introduce any behavior difference.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tejun Heo 2013-11-28 14:54:39 -05:00 committed by Greg Kroah-Hartman
parent 9e30cc9595
commit 061447a496
4 changed files with 11 additions and 9 deletions
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4
fs/sysfs/dir.c
View File

@ -68,7 +68,7 @@ int sysfs_create_dir_ns(struct kobject *kobj, const void *ns)
if (kobj->parent)
parent_sd = kobj->parent->sd;
else
parent_sd = &sysfs_root;
parent_sd = sysfs_root_sd;
if (!parent_sd)
return -ENOENT;
@ -134,7 +134,7 @@ int sysfs_move_dir_ns(struct kobject *kobj, struct kobject *new_parent_kobj,
BUG_ON(!sd->s_parent);
new_parent_sd = new_parent_kobj && new_parent_kobj->sd ?
new_parent_kobj->sd : &sysfs_root;
new_parent_kobj->sd : sysfs_root_sd;
return kernfs_rename_ns(sd, new_parent_sd, sd->s_name, new_ns);
}

8
fs/sysfs/mount.c
View File

@ -32,7 +32,7 @@ static const struct super_operations sysfs_ops = {
.evict_inode = sysfs_evict_inode,
};
struct sysfs_dirent sysfs_root = {
static struct sysfs_dirent sysfs_root = {
.s_name = "",
.s_count = ATOMIC_INIT(1),
.s_flags = SYSFS_DIR,
@ -40,6 +40,8 @@ struct sysfs_dirent sysfs_root = {
.s_ino = 1,
};
struct sysfs_dirent *sysfs_root_sd = &sysfs_root;
static int sysfs_fill_super(struct super_block *sb)
{
struct inode *inode;
@ -53,7 +55,7 @@ static int sysfs_fill_super(struct super_block *sb)
/* get root inode, initialize and unlock it */
mutex_lock(&sysfs_mutex);
inode = sysfs_get_inode(sb, &sysfs_root);
inode = sysfs_get_inode(sb, sysfs_root_sd);
mutex_unlock(&sysfs_mutex);
if (!inode) {
pr_debug("sysfs: could not get root inode\n");
@ -66,7 +68,7 @@ static int sysfs_fill_super(struct super_block *sb)
pr_debug("%s: could not get root dentry!\n", __func__);
return -ENOMEM;
}
root->d_fsdata = &sysfs_root;
root->d_fsdata = sysfs_root_sd;
sb->s_root = root;
sb->s_d_op = &sysfs_dentry_ops;
return 0;

6
fs/sysfs/symlink.c
View File

@ -70,7 +70,7 @@ static int sysfs_do_create_link(struct kobject *kobj, struct kobject *target,
struct sysfs_dirent *parent_sd = NULL;
if (!kobj)
parent_sd = &sysfs_root;
parent_sd = sysfs_root_sd;
else
parent_sd = kobj->sd;
@ -144,7 +144,7 @@ void sysfs_remove_link(struct kobject *kobj, const char *name)
struct sysfs_dirent *parent_sd = NULL;
if (!kobj)
parent_sd = &sysfs_root;
parent_sd = sysfs_root_sd;
else
parent_sd = kobj->sd;
@ -170,7 +170,7 @@ int sysfs_rename_link_ns(struct kobject *kobj, struct kobject *targ,
int result;
if (!kobj)
parent_sd = &sysfs_root;
parent_sd = sysfs_root_sd;
else
parent_sd = kobj->sd;

2
fs/sysfs/sysfs.h
View File

@ -28,7 +28,7 @@ struct sysfs_super_info {
const void *ns;
};
#define sysfs_info(SB) ((struct sysfs_super_info *)(SB->s_fs_info))
extern struct sysfs_dirent sysfs_root;
extern struct sysfs_dirent *sysfs_root_sd;
extern struct kmem_cache *sysfs_dir_cachep;
/*