ceph: document locking for ceph_set_dentry_offset

Reviewed-by: Yehuda Sadeh <yehuda@hq.newdream.net>
Signed-off-by: Sage Weil <sage@newdream.net>

diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c
index a7db56f1523b7634ce4a6da8dde1ae8a75874e6b..5f0013aafa4be13df0f89dae2b04fe359464ffa0 100644 (file)
--- a/fs/ceph/inode.c
+++ b/fs/ceph/inode.c
@@ -843,11 +843,13 @@ out_unlock:
 /*
  * Set dentry's directory position based on the current dir's max, and
  * order it in d_subdirs, so that dcache_readdir behaves.
+ *
+ * Always called under directory's i_mutex.
  */
 static void ceph_set_dentry_offset(struct dentry *dn)
 {
        struct dentry *dir = dn->d_parent;
-       struct inode *inode = dn->d_parent->d_inode;
+       struct inode *inode = dir->d_inode;
        struct ceph_dentry_info *di;
 
        BUG_ON(!inode);