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ceph: properly queue cap snap for newly created snap realm 

commit 3ae0bebc "ceph: queue cap snap only when snap realm's
context changes" introduced a regression: we may not call
queue_realm_cap_snaps() for newly created snap realm. This
regression allows unflushed snapshot data to be overwritten.

Link: http://tracker.ceph.com/issues/21483
Signed-off-by: "Yan, Zheng" <zyan@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Yan, Zheng 2017-09-22 09:26:57 +08:00 committed by Ilya Dryomov
parent 9e66317d3c
commit 9f4057fc93
1 changed files with 3 additions and 5 deletions
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8
fs/ceph/snap.c
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@ -374,12 +374,10 @@ static int build_snap_context(struct ceph_snap_realm *realm,
realm->ino, realm, snapc, snapc->seq,
(unsigned int) snapc->num_snaps);
if (realm->cached_context) {
ceph_put_snap_context(realm->cached_context);
/* queue realm for cap_snap creation */
list_add_tail(&realm->dirty_item, dirty_realms);
}
ceph_put_snap_context(realm->cached_context);
realm->cached_context = snapc;
/* queue realm for cap_snap creation */
list_add_tail(&realm->dirty_item, dirty_realms);
return 0;
fail: