Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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
12static 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
27static 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
37int 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
50void ceph_msgpool_destroy(struct ceph_msgpool *pool)
51{
52 dout("msgpool %s destroy\n", pool->name);
53 mempool_destroy(pool->pool);
54}
55
56struct 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
75void 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}