forked from luck/tmp_suning_uos_patched
d52f847a84
Since we don't need to maintain large pools of messages, we can just use the standard mempool_t. We maintain a msgpool 'wrapper' because we need the mempool_t* in the alloc function, and mempool gives us only pool_data. Signed-off-by: Sage Weil <sage@newdream.net>
69 lines
1.4 KiB
C
69 lines
1.4 KiB
C
#include "ceph_debug.h"
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#include <linux/err.h>
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#include <linux/sched.h>
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#include <linux/types.h>
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#include <linux/vmalloc.h>
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#include "msgpool.h"
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static void *alloc_fn(gfp_t gfp_mask, void *arg)
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{
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struct ceph_msgpool *pool = arg;
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struct ceph_msg *m;
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m = ceph_msg_new(0, pool->front_len, 0, 0, NULL);
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if (IS_ERR(m))
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return NULL;
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return m;
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}
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static void free_fn(void *element, void *arg)
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{
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ceph_msg_put(element);
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}
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int ceph_msgpool_init(struct ceph_msgpool *pool,
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int front_len, int size, bool blocking)
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{
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pool->front_len = front_len;
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pool->pool = mempool_create(size, alloc_fn, free_fn, pool);
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if (!pool->pool)
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return -ENOMEM;
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return 0;
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}
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void ceph_msgpool_destroy(struct ceph_msgpool *pool)
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{
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mempool_destroy(pool->pool);
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}
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struct ceph_msg *ceph_msgpool_get(struct ceph_msgpool *pool,
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int front_len)
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{
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if (front_len > pool->front_len) {
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struct ceph_msg *msg;
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pr_err("msgpool_get pool %p need front %d, pool size is %d\n",
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pool, front_len, pool->front_len);
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WARN_ON(1);
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/* try to alloc a fresh message */
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msg = ceph_msg_new(0, front_len, 0, 0, NULL);
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if (!IS_ERR(msg))
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return msg;
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return NULL;
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}
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return mempool_alloc(pool->pool, GFP_NOFS);
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}
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void ceph_msgpool_put(struct ceph_msgpool *pool, struct ceph_msg *msg)
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{
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/* reset msg front_len; user may have changed it */
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msg->front.iov_len = pool->front_len;
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msg->hdr.front_len = cpu_to_le32(pool->front_len);
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kref_init(&msg->kref); /* retake single ref */
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}
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