ceph: remember subtree root dirfrag's auth MDS

remember dirfrag's auth MDS when it's different from its parent inode's
auth MDS.

Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>

1 files changed, 7 insertions, 1 deletions

diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c
index 850b26d2e601..8b3da8adbbe3 100644
--- a/fs/ceph/inode.c
+++ b/fs/ceph/inode.c
@@ -245,11 +245,17 @@ static int ceph_fill_dirfrag(struct inode *inode,
         u32 id = le32_to_cpu(dirinfo->frag);
         int mds = le32_to_cpu(dirinfo->auth);
         int ndist = le32_to_cpu(dirinfo->ndist);
+        int diri_auth = -1;
         int i;
         int err = 0;
 
+        spin_lock(&ci->i_ceph_lock);
+        if (ci->i_auth_cap)
+                diri_auth = ci->i_auth_cap->mds;
+        spin_unlock(&ci->i_ceph_lock);
+
         mutex_lock(&ci->i_fragtree_mutex);
-        if (ndist == 0) {
+        if (ndist == 0 && mds == diri_auth) {
                 /* no delegation info needed. */
                 frag = __ceph_find_frag(ci, id);
                 if (!frag)