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Merge tag 'md/4.8-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/shli/md
[mirror_ubuntu-bionic-kernel.git] / 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 }