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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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5185352c16
There were several problems here:
1- we weren't tagging allocations with the pool, so they were never
returned to the pool.
2- msgpool_put didn't add back to the mempool, even it were called.
3- msgpool_release didn't clear the pool pointer, so it would have looped
had #1 not been broken.
These may or may not have been responsible for #1136 or #1381 (BUG due to
non-empty mempool on umount). I can't seem to trigger the crash now using
the method I was using before.
Signed-off-by: Sage Weil <sage@newdream.net>
83 lines
1.9 KiB
C
83 lines
1.9 KiB
C
#include <linux/ceph/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 <linux/ceph/msgpool.h>
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static void *msgpool_alloc(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 *msg;
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msg = ceph_msg_new(0, pool->front_len, gfp_mask);
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if (!msg) {
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dout("msgpool_alloc %s failed\n", pool->name);
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} else {
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dout("msgpool_alloc %s %p\n", pool->name, msg);
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msg->pool = pool;
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}
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return msg;
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}
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static void msgpool_free(void *element, void *arg)
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{
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struct ceph_msgpool *pool = arg;
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struct ceph_msg *msg = element;
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dout("msgpool_release %s %p\n", pool->name, msg);
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msg->pool = NULL;
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ceph_msg_put(msg);
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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, const char *name)
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{
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dout("msgpool %s init\n", name);
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pool->front_len = front_len;
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pool->pool = mempool_create(size, msgpool_alloc, msgpool_free, pool);
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if (!pool->pool)
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return -ENOMEM;
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pool->name = name;
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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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dout("msgpool %s destroy\n", pool->name);
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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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struct ceph_msg *msg;
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if (front_len > pool->front_len) {
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dout("msgpool_get %s need front %d, pool size is %d\n",
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pool->name, 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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return ceph_msg_new(0, front_len, GFP_NOFS);
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}
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msg = mempool_alloc(pool->pool, GFP_NOFS);
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dout("msgpool_get %s %p\n", pool->name, msg);
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return msg;
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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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dout("msgpool_put %s %p\n", pool->name, msg);
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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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mempool_free(msg, pool->pool);
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}
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