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/messenger.h>
   9#include <linux/ceph/msgpool.h>
  10
  11static void *msgpool_alloc(gfp_t gfp_mask, void *arg)
  12{
  13        struct ceph_msgpool *pool = arg;
  14        struct ceph_msg *msg;
  15
  16        msg = ceph_msg_new(pool->type, pool->front_len, gfp_mask, true);
  17        if (!msg) {
  18                dout("msgpool_alloc %s failed\n", pool->name);
  19        } else {
  20                dout("msgpool_alloc %s %p\n", pool->name, msg);
  21                msg->pool = pool;
  22        }
  23        return msg;
  24}
  25
  26static void msgpool_free(void *element, void *arg)
  27{
  28        struct ceph_msgpool *pool = arg;
  29        struct ceph_msg *msg = element;
  30
  31        dout("msgpool_release %s %p\n", pool->name, msg);
  32        msg->pool = NULL;
  33        ceph_msg_put(msg);
  34}
  35
  36int ceph_msgpool_init(struct ceph_msgpool *pool, int type,
  37                      int front_len, int size, bool blocking, const char *name)
  38{
  39        dout("msgpool %s init\n", name);
  40        pool->type = type;
  41        pool->front_len = front_len;
  42        pool->pool = mempool_create(size, msgpool_alloc, msgpool_free, pool);
  43        if (!pool->pool)
  44                return -ENOMEM;
  45        pool->name = name;
  46        return 0;
  47}
  48
  49void ceph_msgpool_destroy(struct ceph_msgpool *pool)
  50{
  51        dout("msgpool %s destroy\n", pool->name);
  52        mempool_destroy(pool->pool);
  53}
  54
  55struct ceph_msg *ceph_msgpool_get(struct ceph_msgpool *pool,
  56                                  int front_len)
  57{
  58        struct ceph_msg *msg;
  59
  60        if (front_len > pool->front_len) {
  61                dout("msgpool_get %s need front %d, pool size is %d\n",
  62                       pool->name, front_len, pool->front_len);
  63                WARN_ON(1);
  64
  65                /* try to alloc a fresh message */
  66                return ceph_msg_new(pool->type, front_len, GFP_NOFS, false);
  67        }
  68
  69        msg = mempool_alloc(pool->pool, GFP_NOFS);
  70        dout("msgpool_get %s %p\n", pool->name, msg);
  71        return msg;
  72}
  73
  74void ceph_msgpool_put(struct ceph_msgpool *pool, struct ceph_msg *msg)
  75{
  76        dout("msgpool_put %s %p\n", pool->name, msg);
  77
  78        /* reset msg front_len; user may have changed it */
  79        msg->front.iov_len = pool->front_len;
  80        msg->hdr.front_len = cpu_to_le32(pool->front_len);
  81
  82        kref_init(&msg->kref);  /* retake single ref */
  83        mempool_free(msg, pool->pool);
  84}
  85