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- // SPDX-License-Identifier: GPL-2.0
- #include <linux/ceph/ceph_debug.h>
- #include <linux/err.h>
- #include <linux/sched.h>
- #include <linux/types.h>
- #include <linux/vmalloc.h>
- #include <linux/ceph/messenger.h>
- #include <linux/ceph/msgpool.h>
- static void *msgpool_alloc(gfp_t gfp_mask, void *arg)
- {
- struct ceph_msgpool *pool = arg;
- struct ceph_msg *msg;
- msg = ceph_msg_new2(pool->type, pool->front_len, pool->max_data_items,
- gfp_mask, true);
- if (!msg) {
- dout("msgpool_alloc %s failed\n", pool->name);
- } else {
- dout("msgpool_alloc %s %p\n", pool->name, msg);
- msg->pool = pool;
- }
- return msg;
- }
- static void msgpool_free(void *element, void *arg)
- {
- struct ceph_msgpool *pool = arg;
- struct ceph_msg *msg = element;
- dout("msgpool_release %s %p\n", pool->name, msg);
- msg->pool = NULL;
- ceph_msg_put(msg);
- }
- int ceph_msgpool_init(struct ceph_msgpool *pool, int type,
- int front_len, int max_data_items, int size,
- const char *name)
- {
- dout("msgpool %s init\n", name);
- pool->type = type;
- pool->front_len = front_len;
- pool->max_data_items = max_data_items;
- pool->pool = mempool_create(size, msgpool_alloc, msgpool_free, pool);
- if (!pool->pool)
- return -ENOMEM;
- pool->name = name;
- return 0;
- }
- void ceph_msgpool_destroy(struct ceph_msgpool *pool)
- {
- dout("msgpool %s destroy\n", pool->name);
- mempool_destroy(pool->pool);
- }
- struct ceph_msg *ceph_msgpool_get(struct ceph_msgpool *pool, int front_len,
- int max_data_items)
- {
- struct ceph_msg *msg;
- if (front_len > pool->front_len ||
- max_data_items > pool->max_data_items) {
- pr_warn_ratelimited("%s need %d/%d, pool %s has %d/%d\n",
- __func__, front_len, max_data_items, pool->name,
- pool->front_len, pool->max_data_items);
- WARN_ON_ONCE(1);
- /* try to alloc a fresh message */
- return ceph_msg_new2(pool->type, front_len, max_data_items,
- GFP_NOFS, false);
- }
- msg = mempool_alloc(pool->pool, GFP_NOFS);
- dout("msgpool_get %s %p\n", pool->name, msg);
- return msg;
- }
- void ceph_msgpool_put(struct ceph_msgpool *pool, struct ceph_msg *msg)
- {
- dout("msgpool_put %s %p\n", pool->name, msg);
- /* reset msg front_len; user may have changed it */
- msg->front.iov_len = pool->front_len;
- msg->hdr.front_len = cpu_to_le32(pool->front_len);
- msg->data_length = 0;
- msg->num_data_items = 0;
- kref_init(&msg->kref); /* retake single ref */
- mempool_free(msg, pool->pool);
- }
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