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Merge tag 'spdx_identifiers-4.14-rc8' of git://git.kernel.org/pub/scm/linux/kernel...
[mirror_ubuntu-bionic-kernel.git] / net / ceph / msgpool.c
1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/ceph/ceph_debug.h>
3
4 #include <linux/err.h>
5 #include <linux/sched.h>
6 #include <linux/types.h>
7 #include <linux/vmalloc.h>
8
9 #include <linux/ceph/messenger.h>
10 #include <linux/ceph/msgpool.h>
11
12 static void *msgpool_alloc(gfp_t gfp_mask, void *arg)
13 {
14 struct ceph_msgpool *pool = arg;
15 struct ceph_msg *msg;
16
17 msg = ceph_msg_new(pool->type, pool->front_len, gfp_mask, true);
18 if (!msg) {
19 dout("msgpool_alloc %s failed\n", pool->name);
20 } else {
21 dout("msgpool_alloc %s %p\n", pool->name, msg);
22 msg->pool = pool;
23 }
24 return msg;
25 }
26
27 static void msgpool_free(void *element, void *arg)
28 {
29 struct ceph_msgpool *pool = arg;
30 struct ceph_msg *msg = element;
31
32 dout("msgpool_release %s %p\n", pool->name, msg);
33 msg->pool = NULL;
34 ceph_msg_put(msg);
35 }
36
37 int ceph_msgpool_init(struct ceph_msgpool *pool, int type,
38 int front_len, int size, bool blocking, const char *name)
39 {
40 dout("msgpool %s init\n", name);
41 pool->type = type;
42 pool->front_len = front_len;
43 pool->pool = mempool_create(size, msgpool_alloc, msgpool_free, pool);
44 if (!pool->pool)
45 return -ENOMEM;
46 pool->name = name;
47 return 0;
48 }
49
50 void ceph_msgpool_destroy(struct ceph_msgpool *pool)
51 {
52 dout("msgpool %s destroy\n", pool->name);
53 mempool_destroy(pool->pool);
54 }
55
56 struct ceph_msg *ceph_msgpool_get(struct ceph_msgpool *pool,
57 int front_len)
58 {
59 struct ceph_msg *msg;
60
61 if (front_len > pool->front_len) {
62 dout("msgpool_get %s need front %d, pool size is %d\n",
63 pool->name, front_len, pool->front_len);
64 WARN_ON(1);
65
66 /* try to alloc a fresh message */
67 return ceph_msg_new(pool->type, front_len, GFP_NOFS, false);
68 }
69
70 msg = mempool_alloc(pool->pool, GFP_NOFS);
71 dout("msgpool_get %s %p\n", pool->name, msg);
72 return msg;
73 }
74
75 void ceph_msgpool_put(struct ceph_msgpool *pool, struct ceph_msg *msg)
76 {
77 dout("msgpool_put %s %p\n", pool->name, msg);
78
79 /* reset msg front_len; user may have changed it */
80 msg->front.iov_len = pool->front_len;
81 msg->hdr.front_len = cpu_to_le32(pool->front_len);
82
83 kref_init(&msg->kref); /* retake single ref */
84 mempool_free(msg, pool->pool);
85 }