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[PATCH] fix sysfs interaction and lifetime rules handling for queues

hifive-unleashed-5.1
Al Viro 2006-03-18 18:34:37 -05:00
parent 1312f40e11
commit 483f4afc42
2 changed files with 61 additions and 28 deletions
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83
block/ll_rw_blk.c
View File

@ -1740,16 +1740,11 @@ EXPORT_SYMBOL(blk_run_queue);
* Hopefully the low level driver will have finished any
* outstanding requests first...
**/
void blk_cleanup_queue(request_queue_t * q)
static void blk_release_queue(struct kobject *kobj)
{
request_queue_t *q = container_of(kobj, struct request_queue, kobj);
struct request_list *rl = &q->rq;
if (!atomic_dec_and_test(&q->refcnt))
return;
if (q->elevator)
elevator_exit(q->elevator);
blk_sync_queue(q);
if (rl->rq_pool)
@ -1761,6 +1756,24 @@ void blk_cleanup_queue(request_queue_t * q)
kmem_cache_free(requestq_cachep, q);
}
void blk_put_queue(request_queue_t *q)
{
kobject_put(&q->kobj);
}
EXPORT_SYMBOL(blk_put_queue);
void blk_cleanup_queue(request_queue_t * q)
{
mutex_lock(&q->sysfs_lock);
set_bit(QUEUE_FLAG_DEAD, &q->queue_flags);
mutex_unlock(&q->sysfs_lock);
if (q->elevator)
elevator_exit(q->elevator);
blk_put_queue(q);
}
EXPORT_SYMBOL(blk_cleanup_queue);
static int blk_init_free_list(request_queue_t *q)
@ -1788,6 +1801,8 @@ request_queue_t *blk_alloc_queue(gfp_t gfp_mask)
}
EXPORT_SYMBOL(blk_alloc_queue);
static struct kobj_type queue_ktype;
request_queue_t *blk_alloc_queue_node(gfp_t gfp_mask, int node_id)
{
request_queue_t *q;
@ -1798,11 +1813,16 @@ request_queue_t *blk_alloc_queue_node(gfp_t gfp_mask, int node_id)
memset(q, 0, sizeof(*q));
init_timer(&q->unplug_timer);
atomic_set(&q->refcnt, 1);
snprintf(q->kobj.name, KOBJ_NAME_LEN, "%s", "queue");
q->kobj.ktype = &queue_ktype;
kobject_init(&q->kobj);
q->backing_dev_info.unplug_io_fn = blk_backing_dev_unplug;
q->backing_dev_info.unplug_io_data = q;
mutex_init(&q->sysfs_lock);
return q;
}
EXPORT_SYMBOL(blk_alloc_queue_node);
@ -1901,7 +1921,7 @@ EXPORT_SYMBOL(blk_init_queue_node);
int blk_get_queue(request_queue_t *q)
{
if (likely(!test_bit(QUEUE_FLAG_DEAD, &q->queue_flags))) {
atomic_inc(&q->refcnt);
kobject_get(&q->kobj);
return 0;
}
@ -3764,13 +3784,19 @@ static ssize_t
queue_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
{
struct queue_sysfs_entry *entry = to_queue(attr);
struct request_queue *q;
request_queue_t *q = container_of(kobj, struct request_queue, kobj);
ssize_t res;
q = container_of(kobj, struct request_queue, kobj);
if (!entry->show)
return -EIO;
return entry->show(q, page);
mutex_lock(&q->sysfs_lock);
if (test_bit(QUEUE_FLAG_DEAD, &q->queue_flags)) {
mutex_unlock(&q->sysfs_lock);
return -ENOENT;
}
res = entry->show(q, page);
mutex_unlock(&q->sysfs_lock);
return res;
}
static ssize_t
@ -3778,13 +3804,20 @@ queue_attr_store(struct kobject *kobj, struct attribute *attr,
const char *page, size_t length)
{
struct queue_sysfs_entry *entry = to_queue(attr);
struct request_queue *q;
request_queue_t *q = container_of(kobj, struct request_queue, kobj);
ssize_t res;
q = container_of(kobj, struct request_queue, kobj);
if (!entry->store)
return -EIO;
return entry->store(q, page, length);
mutex_lock(&q->sysfs_lock);
if (test_bit(QUEUE_FLAG_DEAD, &q->queue_flags)) {
mutex_unlock(&q->sysfs_lock);
return -ENOENT;
}
res = entry->store(q, page, length);
mutex_unlock(&q->sysfs_lock);
return res;
}
static struct sysfs_ops queue_sysfs_ops = {
@ -3795,6 +3828,7 @@ static struct sysfs_ops queue_sysfs_ops = {
static struct kobj_type queue_ktype = {
.sysfs_ops = &queue_sysfs_ops,
.default_attrs = default_attrs,
.release = blk_release_queue,
};
int blk_register_queue(struct gendisk *disk)
@ -3807,19 +3841,17 @@ int blk_register_queue(struct gendisk *disk)
return -ENXIO;
q->kobj.parent = kobject_get(&disk->kobj);
if (!q->kobj.parent)
return -EBUSY;
snprintf(q->kobj.name, KOBJ_NAME_LEN, "%s", "queue");
q->kobj.ktype = &queue_ktype;
ret = kobject_register(&q->kobj);
ret = kobject_add(&q->kobj);
if (ret < 0)
return ret;
kobject_uevent(&q->kobj, KOBJ_ADD);
ret = elv_register_queue(q);
if (ret) {
kobject_unregister(&q->kobj);
kobject_uevent(&q->kobj, KOBJ_REMOVE);
kobject_del(&q->kobj);
return ret;
}
@ -3833,7 +3865,8 @@ void blk_unregister_queue(struct gendisk *disk)
if (q && q->request_fn) {
elv_unregister_queue(q);
kobject_unregister(&q->kobj);
kobject_uevent(&q->kobj, KOBJ_REMOVE);
kobject_del(&q->kobj);
kobject_put(&disk->kobj);
}
}

6
include/linux/blkdev.h
View File

@ -406,8 +406,6 @@ struct request_queue
struct blk_queue_tag *queue_tags;
atomic_t refcnt;
unsigned int nr_sorted;
unsigned int in_flight;
@ -426,6 +424,8 @@ struct request_queue
struct request pre_flush_rq, bar_rq, post_flush_rq;
struct request *orig_bar_rq;
unsigned int bi_size;
struct mutex sysfs_lock;
};
#define RQ_INACTIVE (-1)
@ -727,7 +727,7 @@ extern long nr_blockdev_pages(void);
int blk_get_queue(request_queue_t *);
request_queue_t *blk_alloc_queue(gfp_t);
request_queue_t *blk_alloc_queue_node(gfp_t, int);
#define blk_put_queue(q) blk_cleanup_queue((q))
extern void blk_put_queue(request_queue_t *);
/*
* tag stuff