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Commit e5bc08d0 authored by Chengguang Xu's avatar Chengguang Xu Committed by Ilya Dryomov
Browse files

ceph: refactor error handling code in ceph_reserve_caps() 



Call new helper __ceph_unreserve_caps() to reduce duplicated code.

Signed-off-by: default avatarChengguang Xu <cgxu519@gmx.com>
Reviewed-by: default avatar"Yan, Zheng" <zyan@redhat.com>
Signed-off-by: default avatarIlya Dryomov <idryomov@gmail.com>
parent 7bf8f736

fs/ceph/caps.c

+13 −33
Original line number Diff line number Diff line
@@ -198,6 +198,7 @@ int ceph_reserve_caps(struct ceph_mds_client *mdsc, 
	int have;

	int alloc = 0;

	int max_caps;

	int err = 0;

	bool trimmed = false;

	struct ceph_mds_session *s;

	LIST_HEAD(newcaps);
@@ -264,9 +265,14 @@ int ceph_reserve_caps(struct ceph_mds_client *mdsc, 


		pr_warn("reserve caps ctx=%p ENOMEM need=%d got=%d\n",

			ctx, need, have + alloc);

		goto out_nomem;

		err = -ENOMEM;

		break;

	}



	if (!err) {

		BUG_ON(have + alloc != need);

		ctx->count = need;

	}



	spin_lock(&mdsc->caps_list_lock);

	mdsc->caps_total_count += alloc;
@@ -276,42 +282,16 @@ int ceph_reserve_caps(struct ceph_mds_client *mdsc, 
	BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +

					 mdsc->caps_reserve_count +

					 mdsc->caps_avail_count);



	if (err)

		__ceph_unreserve_caps(mdsc, have + alloc);



	spin_unlock(&mdsc->caps_list_lock);



	ctx->count = need;

	dout("reserve caps ctx=%p %d = %d used + %d resv + %d avail\n",

	     ctx, mdsc->caps_total_count, mdsc->caps_use_count,

	     mdsc->caps_reserve_count, mdsc->caps_avail_count);

	return 0;



out_nomem:



	spin_lock(&mdsc->caps_list_lock);

	mdsc->caps_avail_count += have;

	mdsc->caps_reserve_count -= have;



	while (!list_empty(&newcaps)) {

		cap = list_first_entry(&newcaps,

				struct ceph_cap, caps_item);

		list_del(&cap->caps_item);



		/* Keep some preallocated caps around (ceph_min_count), to

		 * avoid lots of free/alloc churn. */

		if (mdsc->caps_avail_count >=

		    mdsc->caps_reserve_count + mdsc->caps_min_count) {

			kmem_cache_free(ceph_cap_cachep, cap);

		} else {

			mdsc->caps_avail_count++;

			mdsc->caps_total_count++;

			list_add(&cap->caps_item, &mdsc->caps_list);

		}

	}



	BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +

					 mdsc->caps_reserve_count +

					 mdsc->caps_avail_count);

	spin_unlock(&mdsc->caps_list_lock);

	return -ENOMEM;

	return err;

}



void ceph_unreserve_caps(struct ceph_mds_client *mdsc,