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
  11 static 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
  26 static 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
  36 int 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
  49 void ceph_msgpool_destroy(struct ceph_msgpool *pool)
  50 {
  51         dout("msgpool %s destroy\n", pool->name);
  52         mempool_destroy(pool->pool);
  53 }
  54
  55 struct 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
  74 void 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 }