From: Yan, Zheng <zheng.z.yan@intel.com>
Date: Fri, 31 May 2013 08:37:11 +0000 (+0800)
Subject: ceph: check migrate seq before changing auth cap
X-Git-Tag: next-20130617~100^2~5
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=ae86ab3d898e3886efb99d660e596b5fc18ae9fe;p=karo-tx-linux.git

ceph: check migrate seq before changing auth cap

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

Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>
Reviewed-by: Sage Weil <sage@inktank.com>
---

diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index 54c290b083ab..790f88b15daf 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)) {