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ceph: use kref for ceph_msg 

Signed-off-by: Sage Weil <sage@newdream.net>
This commit is contained in:
Sage Weil 2009-12-07 15:55:05 -08:00
parent 415e49a9c4
commit c2e552e76e
3 changed files with 25 additions and 33 deletions
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43
fs/ceph/messenger.c
View File

@ -1958,7 +1958,7 @@ struct ceph_msg *ceph_msg_new(int type, int front_len,
m = kmalloc(sizeof(*m), GFP_NOFS);
if (m == NULL)
goto out;
atomic_set(&m->nref, 1);
kref_init(&m->kref);
INIT_LIST_HEAD(&m->list_head);
m->hdr.type = cpu_to_le16(type);
@ -2070,34 +2070,23 @@ void ceph_msg_kfree(struct ceph_msg *m)
/*
* Drop a msg ref. Destroy as needed.
*/
void ceph_msg_put(struct ceph_msg *m)
void ceph_msg_last_put(struct kref *kref)
{
dout("ceph_msg_put %p %d -> %d\n", m, atomic_read(&m->nref),
atomic_read(&m->nref)-1);
if (atomic_read(&m->nref) <= 0) {
pr_err("bad ceph_msg_put on %p %llu %d=%s %d+%d\n",
m, le64_to_cpu(m->hdr.seq),
le16_to_cpu(m->hdr.type),
ceph_msg_type_name(le16_to_cpu(m->hdr.type)),
le32_to_cpu(m->hdr.front_len),
le32_to_cpu(m->hdr.data_len));
WARN_ON(1);
}
if (atomic_dec_and_test(&m->nref)) {
dout("ceph_msg_put last one on %p\n", m);
WARN_ON(!list_empty(&m->list_head));
struct ceph_msg *m = container_of(kref, struct ceph_msg, kref);
/* drop middle, data, if any */
if (m->middle) {
ceph_buffer_put(m->middle);
m->middle = NULL;
}
m->nr_pages = 0;
m->pages = NULL;
dout("ceph_msg_put last one on %p\n", m);
WARN_ON(!list_empty(&m->list_head));
if (m->pool)
ceph_msgpool_put(m->pool, m);
else
ceph_msg_kfree(m);
/* drop middle, data, if any */
if (m->middle) {
ceph_buffer_put(m->middle);
m->middle = NULL;
}
m->nr_pages = 0;
m->pages = NULL;
if (m->pool)
ceph_msgpool_put(m->pool, m);
else
ceph_msg_kfree(m);
}

13
fs/ceph/messenger.h
View File

@ -1,6 +1,7 @@
#ifndef __FS_CEPH_MESSENGER_H
#define __FS_CEPH_MESSENGER_H
#include <linux/kref.h>
#include <linux/mutex.h>
#include <linux/net.h>
#include <linux/radix-tree.h>
@ -85,7 +86,7 @@ struct ceph_msg {
struct page **pages; /* data payload. NOT OWNER. */
unsigned nr_pages; /* size of page array */
struct list_head list_head;
atomic_t nref;
struct kref kref;
bool front_is_vmalloc;
bool more_to_follow;
int front_max;
@ -243,11 +244,13 @@ extern int ceph_alloc_middle(struct ceph_connection *con, struct ceph_msg *msg);
static inline struct ceph_msg *ceph_msg_get(struct ceph_msg *msg)
{
dout("ceph_msg_get %p %d -> %d\n", msg, atomic_read(&msg->nref),
atomic_read(&msg->nref)+1);
atomic_inc(&msg->nref);
kref_get(&msg->kref);
return msg;
}
extern void ceph_msg_put(struct ceph_msg *msg);
extern void ceph_msg_last_put(struct kref *kref);
static inline void ceph_msg_put(struct ceph_msg *msg)
{
kref_put(&msg->kref, ceph_msg_last_put);
}
#endif

2
fs/ceph/msgpool.c
View File

@ -165,7 +165,7 @@ void ceph_msgpool_put(struct ceph_msgpool *pool, struct ceph_msg *msg)
{
spin_lock(&pool->lock);
if (pool->num < pool->min) {
ceph_msg_get(msg); /* retake a single ref */
kref_set(&msg->kref, 1); /* retake a single ref */
list_add(&msg->list_head, &pool->msgs);
pool->num++;
dout("msgpool_put %p reclaim %p, now %d/%d\n", pool, msg,