LXR linux/net/ceph/msgpool.c

   1#include <linux/ceph/ceph_debug.h>
   2
   3#include <linux/err.h>
   4#include <linux/sched.h>
   5#include <linux/types.h>
   6#include <linux/vmalloc.h>
   7
   8#include <linux/ceph/msgpool.h>
   9
  10static void *msgpool_alloc(gfp_t gfp_mask, void *arg)
  11{
  12        struct ceph_msgpool *pool = arg;
  13        struct ceph_msg *msg;
  14
  15        msg = ceph_msg_new(0, pool->front_len, gfp_mask, true);
  16        if (!msg) {
  17                dout("msgpool_alloc %s failed\n", pool->name);
  18        } else {
  19                dout("msgpool_alloc %s %p\n", pool->name, msg);
  20                msg->pool = pool;
  21        }
  22        return msg;
  23}
  24
  25static void msgpool_free(void *element, void *arg)
  26{
  27        struct ceph_msgpool *pool = arg;
  28        struct ceph_msg *msg = element;
  29
  30        dout("msgpool_release %s %p\n", pool->name, msg);
  31        msg->pool = NULL;
  32        ceph_msg_put(msg);
  33}
  34
  35int ceph_msgpool_init(struct ceph_msgpool *pool,
  36                      int front_len, int size, bool blocking, const char *name)
  37{
  38        dout("msgpool %s init\n", name);
  39        pool->front_len = front_len;
  40        pool->pool = mempool_create(size, msgpool_alloc, msgpool_free, pool);
  41        if (!pool->pool)
  42                return -ENOMEM;
  43        pool->name = name;
  44        return 0;
  45}
  46
  47void ceph_msgpool_destroy(struct ceph_msgpool *pool)
  48{
  49        dout("msgpool %s destroy\n", pool->name);
  50        mempool_destroy(pool->pool);
  51}
  52
  53struct ceph_msg *ceph_msgpool_get(struct ceph_msgpool *pool,
  54                                  int front_len)
  55{
  56        struct ceph_msg *msg;
  57
  58        if (front_len > pool->front_len) {
  59                dout("msgpool_get %s need front %d, pool size is %d\n",
  60                       pool->name, front_len, pool->front_len);
  61                WARN_ON(1);
  62
  63                /* try to alloc a fresh message */
  64                return ceph_msg_new(0, front_len, GFP_NOFS, false);
  65        }
  66
  67        msg = mempool_alloc(pool->pool, GFP_NOFS);
  68        dout("msgpool_get %s %p\n", pool->name, msg);
  69        return msg;
  70}
  71
  72void ceph_msgpool_put(struct ceph_msgpool *pool, struct ceph_msg *msg)
  73{
  74        dout("msgpool_put %s %p\n", pool->name, msg);
  75
  76        /* reset msg front_len; user may have changed it */
  77        msg->front.iov_len = pool->front_len;
  78        msg->hdr.front_len = cpu_to_le32(pool->front_len);
  79
  80        kref_init(&msg->kref);  /* retake single ref */
  81        mempool_free(msg, pool->pool);
  82}
  83