ceph: don't update importing cap's mseq when handing cap export

commit 3c1392d4c49962a31874af14ae9ff289cb2b3851 upstream.

Updating mseq makes client think importer mds has accepted all prior
cap messages and importer mds knows what caps client wants. Actually
some cap messages may have been dropped because of mseq mismatch.

If mseq is left untouched, importing cap's mds_wanted later will get
reset by cap import message.

Cc: stable@vger.kernel.org
Signed-off-by: "Yan, Zheng" <zyan@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index ff5d32cf9578f77aa28bebd2634fd61cb3d27064..92eb9c3052eeaf7fd77b5b4b28a1fa88faf2f0bc 100644 (file)
--- a/fs/ceph/caps.c
+++ b/fs/ceph/caps.c
@@ -3438,7 +3438,6 @@ retry:
                        tcap->cap_id = t_cap_id;
                        tcap->seq = t_seq - 1;
                        tcap->issue_seq = t_seq - 1;
-                       tcap->mseq = t_mseq;
                        tcap->issued |= issued;
                        tcap->implemented |= issued;
                        if (cap == ci->i_auth_cap)