*/
#include <linux/fs.h>
+#include <linux/mount.h>
#include <linux/module.h>
#include <linux/kobject.h>
#include <linux/namei.h>
if (!error)
return 0;
+ kobject_put(target);
kfree(sl->link_name);
exit2:
kfree(sl);
*/
int sysfs_create_link(struct kobject * kobj, struct kobject * target, const char * name)
{
- struct dentry * dentry = kobj->dentry;
- int error = 0;
+ struct dentry *dentry = NULL;
+ int error = -EEXIST;
+
+ BUG_ON(!name);
- BUG_ON(!kobj || !kobj->dentry || !name);
+ if (!kobj) {
+ if (sysfs_mount && sysfs_mount->mnt_sb)
+ dentry = sysfs_mount->mnt_sb->s_root;
+ } else
+ dentry = kobj->dentry;
- down(&dentry->d_inode->i_sem);
- error = sysfs_add_link(dentry, name, target);
- up(&dentry->d_inode->i_sem);
+ if (!dentry)
+ return -EFAULT;
+
+ mutex_lock(&dentry->d_inode->i_mutex);
+ if (!sysfs_dirent_exist(dentry->d_fsdata, name))
+ error = sysfs_add_link(dentry, name, target);
+ mutex_unlock(&dentry->d_inode->i_mutex);
return error;
}
EXPORT_SYMBOL_GPL(sysfs_create_link);
EXPORT_SYMBOL_GPL(sysfs_remove_link);
-