From: "Yan, Zheng" <[email protected]>

We may receive old request reply from the exporter MDS after receiving
the importer MDS' cap import message.

Signed-off-by: Yan, Zheng <[email protected]>
---
 fs/ceph/caps.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index 54c290b..790f88b 100644
--- a/fs/ceph/caps.c
+++ b/fs/ceph/caps.c
@@ -612,9 +612,11 @@ retry:
                __cap_delay_requeue(mdsc, ci);
        }
 
-       if (flags & CEPH_CAP_FLAG_AUTH)
-               ci->i_auth_cap = cap;
-       else if (ci->i_auth_cap == cap) {
+       if (flags & CEPH_CAP_FLAG_AUTH) {
+               if (ci->i_auth_cap == NULL ||
+                   ceph_seq_cmp(ci->i_auth_cap->mseq, mseq) < 0)
+                       ci->i_auth_cap = cap;
+       } else if (ci->i_auth_cap == cap) {
                ci->i_auth_cap = NULL;
                spin_lock(&mdsc->cap_dirty_lock);
                if (!list_empty(&ci->i_dirty_item)) {
-- 
1.8.1.4

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