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ceph: refactor ceph_unreserve_caps() 

The code of ceph_unreserve_caps() and error handling in
ceph_reserve_caps() are duplicated, so introduce a 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 23:15:35 +08:00 committed by Ilya Dryomov
parent d554849290
commit 7bf8f736c8
2 changed files with 37 additions and 31 deletions
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66
fs/ceph/caps.c
View File

@ -156,6 +156,37 @@ void ceph_adjust_min_caps(struct ceph_mds_client *mdsc, int delta)
spin_unlock(&mdsc->caps_list_lock);
}
static void __ceph_unreserve_caps(struct ceph_mds_client *mdsc, int nr_caps)
{
struct ceph_cap *cap;
int i;
if (nr_caps) {
BUG_ON(mdsc->caps_reserve_count < nr_caps);
mdsc->caps_reserve_count -= nr_caps;
if (mdsc->caps_avail_count >=
mdsc->caps_reserve_count + mdsc->caps_min_count) {
mdsc->caps_total_count -= nr_caps;
for (i = 0; i < nr_caps; 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 += nr_caps;
}
dout("%s: caps %d = %d used + %d resv + %d avail\n",
__func__,
mdsc->caps_total_count, mdsc->caps_use_count,
mdsc->caps_reserve_count, mdsc->caps_avail_count);
BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
mdsc->caps_reserve_count +
mdsc->caps_avail_count);
}
}
/*
* Called under mdsc->mutex.
*/
@ -283,39 +314,14 @@ out_nomem:
return -ENOMEM;
}
int ceph_unreserve_caps(struct ceph_mds_client *mdsc,
void 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,
mdsc->caps_reserve_count, mdsc->caps_avail_count);
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 0;
spin_lock(&mdsc->caps_list_lock);
__ceph_unreserve_caps(mdsc, ctx->count);
ctx->count = 0;
spin_unlock(&mdsc->caps_list_lock);
}
struct ceph_cap *ceph_get_cap(struct ceph_mds_client *mdsc,

2
fs/ceph/super.h
View File

@ -656,7 +656,7 @@ extern void ceph_caps_finalize(struct ceph_mds_client *mdsc);
extern void ceph_adjust_min_caps(struct ceph_mds_client *mdsc, int delta);
extern int ceph_reserve_caps(struct ceph_mds_client *mdsc,
struct ceph_cap_reservation *ctx, int need);
extern int ceph_unreserve_caps(struct ceph_mds_client *mdsc,
extern void ceph_unreserve_caps(struct ceph_mds_client *mdsc,
struct ceph_cap_reservation *ctx);
extern void ceph_reservation_status(struct ceph_fs_client *client,
int *total, int *avail, int *used,