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Commit b517c1d8 authored by Chengguang Xu's avatar Chengguang Xu Committed by Ilya Dryomov
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ceph: release unreserved caps if having enough available caps 



When unreserving caps check if there is too mamy available caps
in the ->caps_list, if so release unreserved caps.

Signed-off-by: default avatarChengguang Xu <cgxu519@icloud.com>
Reviewed-by: default avatar"Yan, Zheng" <zyan@redhat.com>
Signed-off-by: default avatarIlya Dryomov <idryomov@gmail.com>
parent e327ce06

fs/ceph/caps.c

+15 −1
Original line number Diff line number Diff line
@@ -254,12 +254,26 @@ int ceph_reserve_caps(struct ceph_mds_client *mdsc, 
int ceph_unreserve_caps(struct ceph_mds_client *mdsc,

			struct ceph_cap_reservation *ctx)

{

	int i;

	struct ceph_cap *cap;



	dout("unreserve caps ctx=%p count=%d\n", ctx, ctx->count);

	if (ctx->count) {

		spin_lock(&mdsc->caps_list_lock);

		BUG_ON(mdsc->caps_reserve_count < ctx->count);

		mdsc->caps_reserve_count -= ctx->count;

		if (mdsc->caps_avail_count >=

		    mdsc->caps_reserve_count + mdsc->caps_min_count) {

			mdsc->caps_total_count -= ctx->count;

			for (i = 0; i < ctx->count; i++) {

				cap = list_first_entry(&mdsc->caps_list,

					struct ceph_cap, caps_item);

				list_del(&cap->caps_item);

				kmem_cache_free(ceph_cap_cachep, cap);

			}

		} else {

			mdsc->caps_avail_count += ctx->count;

		}

		ctx->count = 0;

		dout("unreserve caps %d = %d used + %d resv + %d avail\n",

		     mdsc->caps_total_count, mdsc->caps_use_count,