ceph: re-request max_size if cap auth changes

If the auth cap migrates to another MDS, clear requested_max_size so that
we resend any pending max_size increase requests.  This fixes potential
hangs on writes that extend a file and race with an cap migration between
MDSs.

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

1 files changed, 5 insertions, 0 deletions

diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index 6e0942f33dd8..04b207b0c842 100644
--- a/fs/ceph/caps.c
+++ b/fs/ceph/caps.c
@@ -2689,6 +2689,11 @@ static void handle_cap_import(struct ceph_mds_client *mdsc,
                      NULL /* no caps context */);
         try_flush_caps(inode, session, NULL);
         up_read(&mdsc->snap_rwsem);
+
+        /* make sure we re-request max_size, if necessary */
+        spin_lock(&inode->i_lock);
+        ci->i_requested_max_size = 0;
+        spin_unlock(&inode->i_lock);
 }
 
 /*