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libceph: fix msgpool

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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>
This commit is contained in:
Sage Weil 2011-08-09 14:48:11 -07:00
parent d79698da32
commit 5185352c16
1 changed files with 29 additions and 11 deletions
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40
net/ceph/msgpool.c
View File

@ -7,27 +7,37 @@
#include <linux/ceph/msgpool.h>
static void *alloc_fn(gfp_t gfp_mask, void *arg)
static void *msgpool_alloc(gfp_t gfp_mask, void *arg)
{
struct ceph_msgpool *pool = arg;
void *p;
struct ceph_msg *msg;
p = ceph_msg_new(0, pool->front_len, gfp_mask);
if (!p)
pr_err("msgpool %s alloc failed\n", pool->name);
return p;
msg = ceph_msg_new(0, pool->front_len, gfp_mask);
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 free_fn(void *element, void *arg)
static void msgpool_free(void *element, void *arg)
{
ceph_msg_put(element);
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 front_len, int size, bool blocking, const char *name)
{
dout("msgpool %s init\n", name);
pool->front_len = front_len;
pool->pool = mempool_create(size, alloc_fn, free_fn, pool);
pool->pool = mempool_create(size, msgpool_alloc, msgpool_free, pool);
if (!pool->pool)
return -ENOMEM;
pool->name = name;
@ -36,14 +46,17 @@ int ceph_msgpool_init(struct ceph_msgpool *pool,
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)
{
struct ceph_msg *msg;
if (front_len > pool->front_len) {
pr_err("msgpool_get pool %s need front %d, pool size is %d\n",
dout("msgpool_get %s need front %d, pool size is %d\n",
pool->name, front_len, pool->front_len);
WARN_ON(1);
@ -51,14 +64,19 @@ struct ceph_msg *ceph_msgpool_get(struct ceph_msgpool *pool,
return ceph_msg_new(0, front_len, GFP_NOFS);
}
return mempool_alloc(pool->pool, GFP_NOFS);
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);
kref_init(&msg->kref); /* retake single ref */
mempool_free(msg, pool->pool);
}