mnt: Protect the mountpoint hashtable with mount_lock

[mirror_ubuntu-artful-kernel.git] / fs / dcache.c

diff --git a/fs/dcache.c b/fs/dcache.c
index 769903dbc19df53199b4aca2e79607145e179c98..95d71eda81420a506c5a1f4a4f5283b31310d5e4 100644 (file)
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -1336,8 +1336,11 @@ int d_set_mounted(struct dentry *dentry)
        }
        spin_lock(&dentry->d_lock);
        if (!d_unlinked(dentry)) {
-               dentry->d_flags |= DCACHE_MOUNTED;
-               ret = 0;
+               ret = -EBUSY;
+               if (!d_mountpoint(dentry)) {
+                       dentry->d_flags |= DCACHE_MOUNTED;
+                       ret = 0;
+               }
        }
        spin_unlock(&dentry->d_lock);
 out: