From: "Yan, Zheng" <zyan@redhat.com>
Date: Thu, 29 Nov 2018 11:22:50 +0800
Subject: ceph: don't update importing cap's mseq when handing cap export
Git-commit: 3c1392d4c49962a31874af14ae9ff289cb2b3851
Patch-mainline: v5.0-rc1
References: bsc#1121273

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>
Acked-by: Luis Henriques <lhenriques@suse.com>
---
 fs/ceph/caps.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index f3496db4bb3e..a58666a3f8dd 100644
--- a/fs/ceph/caps.c
+++ b/fs/ceph/caps.c
@@ -3569,7 +3569,6 @@ static void handle_cap_export(struct inode *inode, struct ceph_mds_caps *ex,
 			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)