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#include "ceph_debug.h"
#include <linux/err.h>
#include <linux/sched.h>
#include <linux/types.h>
#include <linux/vmalloc.h>
#include "msgpool.h"
static void *alloc_fn(gfp_t gfp_mask, void *arg)
{
struct ceph_msgpool *pool = arg;
struct ceph_msg *m;
m = ceph_msg_new(0, pool->front_len, 0, 0, NULL);
if (IS_ERR(m))
return NULL;
return m;
}
static void free_fn(void *element, void *arg)
{
ceph_msg_put(element);
}
int ceph_msgpool_init(struct ceph_msgpool *pool,
int front_len, int size, bool blocking)
{
pool->front_len = front_len;
pool->pool = mempool_create(size, alloc_fn, free_fn, pool);
if (!pool->pool)
return -ENOMEM;
return 0;
}
void ceph_msgpool_destroy(struct ceph_msgpool *pool)
{
mempool_destroy(pool->pool);
}
struct ceph_msg *ceph_msgpool_get(struct ceph_msgpool *pool,
int front_len)
{
if (front_len > pool->front_len) {
struct ceph_msg *msg;
pr_err("msgpool_get pool %p need front %d, pool size is %d\n",
pool, front_len, pool->front_len);
WARN_ON(1);
/* try to alloc a fresh message */
msg = ceph_msg_new(0, front_len, 0, 0, NULL);
if (!IS_ERR(msg))
return msg;
return NULL;
}
return mempool_alloc(pool->pool, GFP_NOFS);
}
void ceph_msgpool_put(struct ceph_msgpool *pool, struct ceph_msg *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);
kref_init(&msg->kref); /* retake single ref */
}
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