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 0e3de1bb6500449656b30616eee63b2404c289da..e7b54514d99ab2cff0a9408ebc70906544b2928b 100644 (file)
--- a/fs/ceph/caps.c
+++ b/fs/ceph/caps.c
@@ -3243,7 +3243,6 @@ 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)