Commit b884014a authored Feb 23, 2018 by Chengguang Xu Committed by Ilya Dryomov Apr 02, 2018

ceph: adding protection for showing cap reservation info



Adding spinlock protection during getting cap reservation
ralated fields so that the numbers match below BUG_ON condition
in the code.

BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
				 mdsc->caps_reserve_count +
				 mdsc->caps_avail_count);

Signed-off-by: Chengguang Xu <cgxu519@icloud.com>
Reviewed-by: "Yan, Zheng" <zyan@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

parent f2f87877

fs/ceph/caps.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -341,6 +341,8 @@ void ceph_reservation_status(struct ceph_fs_client *fsc,
		{
		struct ceph_mds_client *mdsc = fsc->mdsc;

		spin_lock(&mdsc->caps_list_lock);

		if (total)
		*total = mdsc->caps_total_count;
		if (avail)
		@@ -351,6 +353,8 @@ void ceph_reservation_status(struct ceph_fs_client *fsc,
		*reserved = mdsc->caps_reserve_count;
		if (min)
		*min = mdsc->caps_min_count;

		spin_unlock(&mdsc->caps_list_lock);
		}

		/*