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
  10 static 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);
  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
  25 static 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
  35 int 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
  47 void ceph_msgpool_destroy(struct ceph_msgpool *pool)
  48 {
  49         dout("msgpool %s destroy\n", pool->name);
  50         mempool_destroy(pool->pool);
  51 }
  52
  53 struct 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);
  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
  72 void 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 }