Commit de6bf18e authored by Louis Rilling's avatar Louis Rilling Committed by Mark Fasheh

[PATCH] configfs: Consolidate locking around configfs_detach_prep() in configfs_rmdir()

It appears that configfs_rmdir() can protect configfs_detach_prep() retries with
less calls to {spin,mutex}_{lock,unlock}, and a cleaner code.

This patch does not change any behavior, except that it removes two useless
lock/unlock pairs having nothing inside to protect and providing a useless
barrier.
Signed-off-by: default avatarLouis Rilling <louis.rilling@kerlabs.com>
Signed-off-by: default avatarJoel Becker <Joel.Becker@oracle.com>
Signed-off-by: default avatarMark Fasheh <mfasheh@suse.com>
parent 9780eb6c
......@@ -1311,16 +1311,18 @@ static int configfs_rmdir(struct inode *dir, struct dentry *dentry)
* Ensure that no racing symlink() will make detach_prep() fail while
* the new link is temporarily attached
*/
mutex_lock(&configfs_symlink_mutex);
spin_lock(&configfs_dirent_lock);
do {
struct mutex *wait_mutex;
mutex_lock(&configfs_symlink_mutex);
spin_lock(&configfs_dirent_lock);
ret = configfs_detach_prep(dentry, &wait_mutex);
if (ret) {
if (ret)
configfs_detach_rollback(dentry);
spin_unlock(&configfs_dirent_lock);
mutex_unlock(&configfs_symlink_mutex);
spin_unlock(&configfs_dirent_lock);
mutex_unlock(&configfs_symlink_mutex);
if (ret) {
if (ret != -EAGAIN) {
config_item_put(parent_item);
return ret;
......@@ -1329,13 +1331,8 @@ static int configfs_rmdir(struct inode *dir, struct dentry *dentry)
/* Wait until the racing operation terminates */
mutex_lock(wait_mutex);
mutex_unlock(wait_mutex);
mutex_lock(&configfs_symlink_mutex);
spin_lock(&configfs_dirent_lock);
}
} while (ret == -EAGAIN);
spin_unlock(&configfs_dirent_lock);
mutex_unlock(&configfs_symlink_mutex);
/* Get a working ref for the duration of this function */
item = configfs_get_config_item(dentry);
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment