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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>
This commit is contained in:
Chengguang Xu 2018-02-23 17:09:38 +08:00 committed by Ilya Dryomov
parent f2f87877b8
commit b884014a91
1 changed files with 4 additions and 0 deletions
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4
fs/ceph/caps.c
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@ -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);
}
/*