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-rw-r--r--fs/sysfs/dir.c45
1 files changed, 45 insertions, 0 deletions
diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c
index 3aa3434621ca..a5782e8c7f07 100644
--- a/fs/sysfs/dir.c
+++ b/fs/sysfs/dir.c
@@ -372,6 +372,51 @@ int sysfs_rename_dir(struct kobject * kobj, const char *new_name)
return error;
}
+int sysfs_move_dir(struct kobject *kobj, struct kobject *new_parent)
+{
+ struct dentry *old_parent_dentry, *new_parent_dentry, *new_dentry;
+ struct sysfs_dirent *new_parent_sd, *sd;
+ int error;
+
+ if (!new_parent)
+ return -EINVAL;
+
+ old_parent_dentry = kobj->parent ?
+ kobj->parent->dentry : sysfs_mount->mnt_sb->s_root;
+ new_parent_dentry = new_parent->dentry;
+
+again:
+ mutex_lock(&old_parent_dentry->d_inode->i_mutex);
+ if (!mutex_trylock(&new_parent_dentry->d_inode->i_mutex)) {
+ mutex_unlock(&old_parent_dentry->d_inode->i_mutex);
+ goto again;
+ }
+
+ new_parent_sd = new_parent_dentry->d_fsdata;
+ sd = kobj->dentry->d_fsdata;
+
+ new_dentry = lookup_one_len(kobj->name, new_parent_dentry,
+ strlen(kobj->name));
+ if (IS_ERR(new_dentry)) {
+ error = PTR_ERR(new_dentry);
+ goto out;
+ } else
+ error = 0;
+ d_add(new_dentry, NULL);
+ d_move(kobj->dentry, new_dentry);
+ dput(new_dentry);
+
+ /* Remove from old parent's list and insert into new parent's list. */
+ list_del_init(&sd->s_sibling);
+ list_add(&sd->s_sibling, &new_parent_sd->s_children);
+
+out:
+ mutex_unlock(&new_parent_dentry->d_inode->i_mutex);
+ mutex_unlock(&old_parent_dentry->d_inode->i_mutex);
+
+ return error;
+}
+
static int sysfs_dir_open(struct inode *inode, struct file *file)
{
struct dentry * dentry = file->f_dentry;