summaryrefslogtreecommitdiffstats
path: root/kernel/cgroup.c
diff options
context:
space:
mode:
Diffstat (limited to 'kernel/cgroup.c')
-rw-r--r--kernel/cgroup.c29
1 files changed, 11 insertions, 18 deletions
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index c02a288a4e3d..52f0498db946 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -2868,17 +2868,6 @@ static int cgroup_cfts_commit(struct cftype *cfts, bool is_add)
mutex_unlock(&cgroup_mutex);
- /* @root always needs to be updated */
- inode = root->dentry->d_inode;
- mutex_lock(&inode->i_mutex);
- mutex_lock(&cgroup_mutex);
- ret = cgroup_addrm_files(root, cfts, is_add);
- mutex_unlock(&cgroup_mutex);
- mutex_unlock(&inode->i_mutex);
-
- if (ret)
- goto out_deact;
-
/* add/rm files for all cgroups created before */
rcu_read_lock();
css_for_each_descendant_pre(css, cgroup_css(root, ss->subsys_id)) {
@@ -2907,7 +2896,6 @@ static int cgroup_cfts_commit(struct cftype *cfts, bool is_add)
}
rcu_read_unlock();
dput(prev);
-out_deact:
deactivate_super(sb);
return ret;
}
@@ -3099,7 +3087,8 @@ EXPORT_SYMBOL_GPL(css_next_child);
* @root: css whose descendants to walk
*
* To be used by css_for_each_descendant_pre(). Find the next descendant
- * to visit for pre-order traversal of @root's descendants.
+ * to visit for pre-order traversal of @root's descendants. @root is
+ * included in the iteration and the first node to be visited.
*
* While this function requires RCU read locking, it doesn't require the
* whole traversal to be contained in a single RCU critical section. This
@@ -3114,9 +3103,9 @@ css_next_descendant_pre(struct cgroup_subsys_state *pos,
WARN_ON_ONCE(!rcu_read_lock_held());
- /* if first iteration, pretend we just visited @root */
+ /* if first iteration, visit @root */
if (!pos)
- pos = root;
+ return root;
/* visit the first child if exists */
next = css_next_child(NULL, pos);
@@ -3186,7 +3175,8 @@ css_leftmost_descendant(struct cgroup_subsys_state *pos)
* @root: css whose descendants to walk
*
* To be used by css_for_each_descendant_post(). Find the next descendant
- * to visit for post-order traversal of @root's descendants.
+ * to visit for post-order traversal of @root's descendants. @root is
+ * included in the iteration and the last node to be visited.
*
* While this function requires RCU read locking, it doesn't require the
* whole traversal to be contained in a single RCU critical section. This
@@ -3207,14 +3197,17 @@ css_next_descendant_post(struct cgroup_subsys_state *pos,
return next != root ? next : NULL;
}
+ /* if we visited @root, we're done */
+ if (pos == root)
+ return NULL;
+
/* if there's an unvisited sibling, visit its leftmost descendant */
next = css_next_child(pos, css_parent(pos));
if (next)
return css_leftmost_descendant(next);
/* no sibling left, visit parent */
- next = css_parent(pos);
- return next != root ? next : NULL;
+ return css_parent(pos);
}
EXPORT_SYMBOL_GPL(css_next_descendant_post);