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blk-mq: allow the hctx cpu hotplug notifier to return errors

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Prepare this for the next patch which adds more smarts in the
plugging logic, so that we can save some memory.

Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Jens Axboe 2014-05-21 13:59:08 -06:00
parent da41a589f5
commit e814e71ba4
4 changed files with 15 additions and 10 deletions
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12
block/blk-mq-cpu.c
View File

@ -18,14 +18,18 @@ static int blk_mq_main_cpu_notify(struct notifier_block *self,
{
unsigned int cpu = (unsigned long) hcpu;
struct blk_mq_cpu_notifier *notify;
int ret = NOTIFY_OK;
raw_spin_lock(&blk_mq_cpu_notify_lock);
list_for_each_entry(notify, &blk_mq_cpu_notify_list, list)
notify->notify(notify->data, action, cpu);
list_for_each_entry(notify, &blk_mq_cpu_notify_list, list) {
ret = notify->notify(notify->data, action, cpu);
if (ret != NOTIFY_OK)
break;
}
raw_spin_unlock(&blk_mq_cpu_notify_lock);
return NOTIFY_OK;
return ret;
}
void blk_mq_register_cpu_notifier(struct blk_mq_cpu_notifier *notifier)
@ -45,7 +49,7 @@ void blk_mq_unregister_cpu_notifier(struct blk_mq_cpu_notifier *notifier)
}
void blk_mq_init_cpu_notifier(struct blk_mq_cpu_notifier *notifier,
void (*fn)(void *, unsigned long, unsigned int),
int (*fn)(void *, unsigned long, unsigned int),
void *data)
{
notifier->notify = fn;

9
block/blk-mq.c
View File

@ -1196,8 +1196,8 @@ void blk_mq_free_single_hw_queue(struct blk_mq_hw_ctx *hctx,
}
EXPORT_SYMBOL(blk_mq_free_single_hw_queue);
static void blk_mq_hctx_notify(void *data, unsigned long action,
unsigned int cpu)
static int blk_mq_hctx_notify(void *data, unsigned long action,
unsigned int cpu)
{
struct blk_mq_hw_ctx *hctx = data;
struct request_queue *q = hctx->queue;
@ -1205,7 +1205,7 @@ static void blk_mq_hctx_notify(void *data, unsigned long action,
LIST_HEAD(tmp);
if (action != CPU_DEAD && action != CPU_DEAD_FROZEN)
return;
return NOTIFY_OK;
/*
* Move ctx entries to new CPU, if this one is going away.
@ -1220,7 +1220,7 @@ static void blk_mq_hctx_notify(void *data, unsigned long action,
spin_unlock(&ctx->lock);
if (list_empty(&tmp))
return;
return NOTIFY_OK;
ctx = blk_mq_get_ctx(q);
spin_lock(&ctx->lock);
@ -1240,6 +1240,7 @@ static void blk_mq_hctx_notify(void *data, unsigned long action,
blk_mq_run_hw_queue(hctx, true);
blk_mq_put_ctx(ctx);
return NOTIFY_OK;
}
static void blk_mq_free_rq_map(struct blk_mq_tag_set *set,

2
block/blk-mq.h
View File

@ -39,7 +39,7 @@ int blk_mq_update_nr_requests(struct request_queue *q, unsigned int nr);
*/
struct blk_mq_cpu_notifier;
void blk_mq_init_cpu_notifier(struct blk_mq_cpu_notifier *notifier,
void (*fn)(void *, unsigned long, unsigned int),
int (*fn)(void *, unsigned long, unsigned int),
void *data);
void blk_mq_register_cpu_notifier(struct blk_mq_cpu_notifier *notifier);
void blk_mq_unregister_cpu_notifier(struct blk_mq_cpu_notifier *notifier);

2
include/linux/blk-mq.h
View File

@ -8,7 +8,7 @@ struct blk_mq_tags;
struct blk_mq_cpu_notifier {
struct list_head list;
void *data;
void (*notify)(void *data, unsigned long action, unsigned int cpu);
int (*notify)(void *data, unsigned long action, unsigned int cpu);
};
struct blk_mq_ctxmap {