// SPDX-License-Identifier: GPL-2.0#include <linux/ceph/ceph_debug.h> #include <linux/err.h>#include <linux/sched.h>#include <linux/types.h>#include <linux/vmalloc.h> #include <linux/ceph/messenger.h>#include <linux/ceph/msgpool.h> static void *msgpool_alloc(gfp_t gfp_mask, void *arg){	struct ceph_msgpool *pool = arg;	struct ceph_msg *msg; 	msg = ceph_msg_new2(pool->type, pool->front_len, pool->max_data_items,			    gfp_mask, true);	if (!msg) {		dout("msgpool_alloc %s failed\n", pool->name);	} else {		dout("msgpool_alloc %s %p\n", pool->name, msg);		msg->pool = pool;	}	return msg;} static void msgpool_free(void *element, void *arg){	struct ceph_msgpool *pool = arg;	struct ceph_msg *msg = element; 	dout("msgpool_release %s %p\n", pool->name, msg);	msg->pool = NULL;	ceph_msg_put(msg);} int ceph_msgpool_init(struct ceph_msgpool *pool, int type,		      int front_len, int max_data_items, int size,		      const char *name){	dout("msgpool %s init\n", name);	pool->type = type;	pool->front_len = front_len;	pool->max_data_items = max_data_items;	pool->pool = mempool_create(size, msgpool_alloc, msgpool_free, pool);	if (!pool->pool)		return -ENOMEM;	pool->name = name;	return 0;} void ceph_msgpool_destroy(struct ceph_msgpool *pool){	dout("msgpool %s destroy\n", pool->name);	mempool_destroy(pool->pool);} struct ceph_msg *ceph_msgpool_get(struct ceph_msgpool *pool, int front_len,				  int max_data_items){	struct ceph_msg *msg; 	if (front_len > pool->front_len ||	    max_data_items > pool->max_data_items) {		pr_warn_ratelimited("%s need %d/%d, pool %s has %d/%d\n",		    __func__, front_len, max_data_items, pool->name,		    pool->front_len, pool->max_data_items);		WARN_ON_ONCE(1); 		/* try to alloc a fresh message */		return ceph_msg_new2(pool->type, front_len, max_data_items,				     GFP_NOFS, false);	} 	msg = mempool_alloc(pool->pool, GFP_NOFS);	dout("msgpool_get %s %p\n", pool->name, msg);	return msg;} void ceph_msgpool_put(struct ceph_msgpool *pool, struct ceph_msg *msg){	dout("msgpool_put %s %p\n", pool->name, msg); 	/* reset msg front_len; user may have changed it */	msg->front.iov_len = pool->front_len;	msg->hdr.front_len = cpu_to_le32(pool->front_len); 	msg->data_length = 0;	msg->num_data_items = 0; 	kref_init(&msg->kref);  /* retake single ref */	mempool_free(msg, pool->pool);}