ceph: avoid dcache readdir for snapdir

We should always go to the MDS for readdir on the hidden snapdir.  The
set of snapshots can change at any time; the client can't trust its cache
for that.

Signed-off-by: Sage Weil <sage@newdream.net>

1 files changed, 1 insertions, 0 deletions

diff --git a/fs/ceph/dir.c b/fs/ceph/dir.c
index f85719310db2..ea36ba9960d3 100644
--- a/fs/ceph/dir.c
+++ b/fs/ceph/dir.c
@@ -266,6 +266,7 @@ static int ceph_readdir(struct file *filp, void *dirent, filldir_t filldir)
         spin_lock(&inode->i_lock);
         if ((filp->f_pos == 2 || fi->dentry) &&
             !ceph_test_opt(client, NOASYNCREADDIR) &&
+            ceph_snap(inode) != CEPH_SNAPDIR &&
             (ci->i_ceph_flags & CEPH_I_COMPLETE) &&
             __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1)) {
                 err = __dcache_readdir(filp, dirent, filldir);