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>

diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c
index 850b26d..8b3da8a 100644 (file)
--- 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)