Linux Kernel  3.7.1
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msgpool.c
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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(pool->type, 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 
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, int type,
36  int front_len, int size, bool blocking, const char *name)
37 {
38  dout("msgpool %s init\n", name);
39  pool->type = type;
40  pool->front_len = front_len;
41  pool->pool = mempool_create(size, msgpool_alloc, msgpool_free, pool);
42  if (!pool->pool)
43  return -ENOMEM;
44  pool->name = name;
45  return 0;
46 }
47 
49 {
50  dout("msgpool %s destroy\n", pool->name);
51  mempool_destroy(pool->pool);
52 }
53 
54 struct ceph_msg *ceph_msgpool_get(struct ceph_msgpool *pool,
55  int front_len)
56 {
57  struct ceph_msg *msg;
58 
59  if (front_len > pool->front_len) {
60  dout("msgpool_get %s need front %d, pool size is %d\n",
61  pool->name, front_len, pool->front_len);
62  WARN_ON(1);
63 
64  /* try to alloc a fresh message */
65  return ceph_msg_new(pool->type, front_len, GFP_NOFS, false);
66  }
67 
68  msg = mempool_alloc(pool->pool, GFP_NOFS);
69  dout("msgpool_get %s %p\n", pool->name, msg);
70  return msg;
71 }
72 
73 void ceph_msgpool_put(struct ceph_msgpool *pool, struct ceph_msg *msg)
74 {
75  dout("msgpool_put %s %p\n", pool->name, msg);
76 
77  /* reset msg front_len; user may have changed it */
78  msg->front.iov_len = pool->front_len;
79  msg->hdr.front_len = cpu_to_le32(pool->front_len);
80 
81  kref_init(&msg->kref); /* retake single ref */
82  mempool_free(msg, pool->pool);
83 }