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_new2(pool->type, pool->front_len, pool->max_data_items,
  18                             gfp_mask, true);
  19         if (!msg) {
  20                 dout("msgpool_alloc %s failed\n", pool->name);
  21         } else {
  22                 dout("msgpool_alloc %s %p\n", pool->name, msg);
  23                 msg->pool = pool;
  24         }
  25         return msg;
  26 }
  27
  28 static void msgpool_free(void *element, void *arg)
  29 {
  30         struct ceph_msgpool *pool = arg;
  31         struct ceph_msg *msg = element;
  32
  33         dout("msgpool_release %s %p\n", pool->name, msg);
  34         msg->pool = NULL;
  35         ceph_msg_put(msg);
  36 }
  37
  38 int ceph_msgpool_init(struct ceph_msgpool *pool, int type,
  39                       int front_len, int max_data_items, int size,
  40                       const char *name)
  41 {
  42         dout("msgpool %s init\n", name);
  43         pool->type = type;
  44         pool->front_len = front_len;
  45         pool->max_data_items = max_data_items;
  46         pool->pool = mempool_create(size, msgpool_alloc, msgpool_free, pool);
  47         if (!pool->pool)
  48                 return -ENOMEM;
  49         pool->name = name;
  50         return 0;
  51 }
  52
  53 void ceph_msgpool_destroy(struct ceph_msgpool *pool)
  54 {
  55         dout("msgpool %s destroy\n", pool->name);
  56         mempool_destroy(pool->pool);
  57 }
  58
  59 struct ceph_msg *ceph_msgpool_get(struct ceph_msgpool *pool, int front_len,
  60                                   int max_data_items)
  61 {
  62         struct ceph_msg *msg;
  63
  64         if (front_len > pool->front_len ||
  65             max_data_items > pool->max_data_items) {
  66                 pr_warn_ratelimited("%s need %d/%d, pool %s has %d/%d\n",
  67                     __func__, front_len, max_data_items, pool->name,
  68                     pool->front_len, pool->max_data_items);
  69                 WARN_ON_ONCE(1);
  70
  71                 /* try to alloc a fresh message */
  72                 return ceph_msg_new2(pool->type, front_len, max_data_items,
  73                                      GFP_NOFS, false);
  74         }
  75
  76         msg = mempool_alloc(pool->pool, GFP_NOFS);
  77         dout("msgpool_get %s %p\n", pool->name, msg);
  78         return msg;
  79 }
  80
  81 void ceph_msgpool_put(struct ceph_msgpool *pool, struct ceph_msg *msg)
  82 {
  83         dout("msgpool_put %s %p\n", pool->name, msg);
  84
  85         /* reset msg front_len; user may have changed it */
  86         msg->front.iov_len = pool->front_len;
  87         msg->hdr.front_len = cpu_to_le32(pool->front_len);
  88
  89         msg->data_length = 0;
  90         msg->num_data_items = 0;
  91
  92         kref_init(&msg->kref);  /* retake single ref */
  93         mempool_free(msg, pool->pool);
  94 }