ceph: do not touch_caps while iterating over caps list

Avoid confusing iterate_session_caps(), flag the session while we are
iterating so that __touch_cap does not rearrange items on the list.

All other modifiers of session->s_caps do so under the protection of
s_mutex.

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

1 files changed, 1 insertions, 0 deletions

diff --git a/fs/ceph/mds_client.h b/fs/ceph/mds_client.h
index 41af5ca316e6..b1c2025227c5 100644
--- a/fs/ceph/mds_client.h
+++ b/fs/ceph/mds_client.h
@@ -114,6 +114,7 @@ struct ceph_mds_session {
         int               s_num_cap_releases;
         struct list_head  s_cap_releases; /* waiting cap_release messages */
         struct list_head  s_cap_releases_done; /* ready to send */
+        bool              s_iterating_caps;
 
         /* protected by mutex */
         struct list_head  s_cap_flushing;     /* inodes w/ flushing caps */