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sysfs, kernfs: introduce sysfs_root_sd

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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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8
fs/sysfs/mount.c
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@@ -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;