1 files changed, 41 insertions, 12 deletions

diff --git a/fs/dcache.c b/fs/dcache.c
index c23f78a9d156..d54a99baf4f3 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -530,6 +530,38 @@ failed:
 	return dentry; /* try again with same dentry */
 }
 
+static inline struct dentry *lock_parent(struct dentry *dentry)
+{
+	struct dentry *parent = dentry->d_parent;
+	if (IS_ROOT(dentry))
+		return NULL;
+	if (likely(spin_trylock(&parent->d_lock)))
+		return parent;
+	spin_unlock(&dentry->d_lock);
+	rcu_read_lock();
+again:
+	parent = ACCESS_ONCE(dentry->d_parent);
+	spin_lock(&parent->d_lock);
+	/*
+	 * We can't blindly lock dentry until we are sure
+	 * that we won't violate the locking order.
+	 * Any changes of dentry->d_parent must have
+	 * been done with parent->d_lock held, so
+	 * spin_lock() above is enough of a barrier
+	 * for checking if it's still our child.
+	 */
+	if (unlikely(parent != dentry->d_parent)) {
+		spin_unlock(&parent->d_lock);
+		goto again;
+	}
+	rcu_read_unlock();
+	if (parent != dentry)
+		spin_lock(&dentry->d_lock);
+	else
+		parent = NULL;
+	return parent;
+}
+
 /* 
  * This is dput
  *
@@ -804,6 +836,8 @@ static void shrink_dentry_list(struct list_head *list)
 		struct inode *inode;
 		dentry = list_entry(list->prev, struct dentry, d_lru);
 		spin_lock(&dentry->d_lock);
+		parent = lock_parent(dentry);
+
 		/*
 		 * The dispose list is isolated and dentries are not accounted
 		 * to the LRU here, so we can simply remove it from the list
@@ -817,6 +851,8 @@ static void shrink_dentry_list(struct list_head *list)
 		 */
 		if ((int)dentry->d_lockref.count > 0) {
 			spin_unlock(&dentry->d_lock);
+			if (parent)
+				spin_unlock(&parent->d_lock);
 			continue;
 		}
 
@@ -824,6 +860,8 @@ static void shrink_dentry_list(struct list_head *list)
 		if (unlikely(dentry->d_flags & DCACHE_DENTRY_KILLED)) {
 			bool can_free = dentry->d_flags & DCACHE_MAY_FREE;
 			spin_unlock(&dentry->d_lock);
+			if (parent)
+				spin_unlock(&parent->d_lock);
 			if (can_free)
 				dentry_free(dentry);
 			continue;
@@ -833,22 +871,13 @@ static void shrink_dentry_list(struct list_head *list)
 		if (inode && unlikely(!spin_trylock(&inode->i_lock))) {
 			d_shrink_add(dentry, list);
 			spin_unlock(&dentry->d_lock);
+			if (parent)
+				spin_unlock(&parent->d_lock);
 			continue;
 		}
 
-		parent = NULL;
-		if (!IS_ROOT(dentry)) {
-			parent = dentry->d_parent;
-			if (unlikely(!spin_trylock(&parent->d_lock))) {
-				if (inode)
-					spin_unlock(&inode->i_lock);
-				d_shrink_add(dentry, list);
-				spin_unlock(&dentry->d_lock);
-				continue;
-			}
-		}
-
 		__dentry_kill(dentry);
+
 		/*
 		 * We need to prune ancestors too. This is necessary to prevent
 		 * quadratic behavior of shrink_dcache_parent(), but is also