ceph: Hold caps_list_lock when adjusting caps_{use, total}_count

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

diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index 3251e9cc64014fc99f7660d46388427732c88114..2d0141e95c88465e4416e88ac5b447ebcaddcbf7 100644 (file)
--- a/fs/ceph/caps.c
+++ b/fs/ceph/caps.c
@@ -236,8 +236,10 @@ static struct ceph_cap *get_cap(struct ceph_mds_client *mdsc,
        if (!ctx) {
                cap = kmem_cache_alloc(ceph_cap_cachep, GFP_NOFS);
                if (cap) {
+                       spin_lock(&mdsc->caps_list_lock);
                        mdsc->caps_use_count++;
                        mdsc->caps_total_count++;
+                       spin_unlock(&mdsc->caps_list_lock);
                }
                return cap;
        }