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ceph: refactor error handling code in ceph_reserve_caps() 

Call new helper __ceph_unreserve_caps() to reduce duplicated code.

Signed-off-by: Chengguang Xu <cgxu519@gmx.com>
Reviewed-by: "Yan, Zheng" <zyan@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Chengguang Xu 2018-07-28 23:15:37 +08:00 committed by Ilya Dryomov
parent 7bf8f736c8
commit e5bc08d09f
1 changed files with 13 additions and 33 deletions
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46
fs/ceph/caps.c
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@ -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;
}
BUG_ON(have + alloc != 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,