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>
diff --git a/fs/ceph/dir.c b/fs/ceph/dir.c
index f857193..ea36ba9 100644
--- a/fs/ceph/dir.c
+++ b/fs/ceph/dir.c
@@ -266,6 +266,7 @@
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);