1 files changed, 38 insertions, 0 deletions

diff --git a/fs/configfs/inode.c b/fs/configfs/inode.c
index 5d349d38e056..4921e7426d95 100644
--- a/fs/configfs/inode.c
+++ b/fs/configfs/inode.c
@@ -33,10 +33,15 @@
 #include <linux/backing-dev.h>
 #include <linux/capability.h>
 #include <linux/sched.h>
+#include <linux/lockdep.h>
 
 #include <linux/configfs.h>
 #include "configfs_internal.h"
 
+#ifdef CONFIG_LOCKDEP
+static struct lock_class_key default_group_class[MAX_LOCK_DEPTH];
+#endif
+
 extern struct super_block * configfs_sb;
 
 static const struct address_space_operations configfs_aops = {
@@ -150,6 +155,38 @@ struct inode * configfs_new_inode(mode_t mode, struct configfs_dirent * sd)
         return inode;
 }
 
+#ifdef CONFIG_LOCKDEP
+
+static void configfs_set_inode_lock_class(struct configfs_dirent *sd,
+                                          struct inode *inode)
+{
+        int depth = sd->s_depth;
+
+        if (depth > 0) {
+                if (depth <= ARRAY_SIZE(default_group_class)) {
+                        lockdep_set_class(&inode->i_mutex,
+                                          &default_group_class[depth - 1]);
+                } else {
+                        /*
+                         * In practice the maximum level of locking depth is
+                         * already reached. Just inform about possible reasons.
+                         */
+                        printk(KERN_INFO "configfs: Too many levels of inodes"
+                               " for the locking correctness validator.\n");
+                        printk(KERN_INFO "Spurious warnings may appear.\n");
+                }
+        }
+}
+
+#else /* CONFIG_LOCKDEP */
+
+static void configfs_set_inode_lock_class(struct configfs_dirent *sd,
+                                          struct inode *inode)
+{
+}
+
+#endif /* CONFIG_LOCKDEP */
+
 int configfs_create(struct dentry * dentry, int mode, int (*init)(struct inode *))
 {
         int error = 0;
@@ -162,6 +199,7 @@ int configfs_create(struct dentry * dentry, int mode, int (*init)(struct inode *
                                         struct inode *p_inode = dentry->d_parent->d_inode;
                                         p_inode->i_mtime = p_inode->i_ctime = CURRENT_TIME;
                                 }
+                                configfs_set_inode_lock_class(sd, inode);
                                 goto Proceed;
                         }
                         else