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mtd_blkdevs: Add background processing support 

Add a new background method into mtd_blktrans_ops, add background support
into mtd_blktrans_thread(), and add mtd_blktrans_cease_background().

If the mtd blktrans dev has the background support, the thread will
call background function when the request queue becomes empty. The background
operation may run as long as needs to until
mtd_blktrans_cease_background() tells to stop.

Signed-off-by: Jarkko Lavinen <jarkko.lavinen@nokia.com>
Tested-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Jarkko Lavinen 2011-02-14 16:16:09 +02:00 committed by David Woodhouse
parent 13ce77f46c
commit c7519dbf6f
2 changed files with 28 additions and 0 deletions
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26
drivers/mtd/mtd_blkdevs.c
View File

@ -119,11 +119,22 @@ static int do_blktrans_request(struct mtd_blktrans_ops *tr,
}
}
int mtd_blktrans_cease_background(struct mtd_blktrans_dev *dev)
{
if (kthread_should_stop())
return 1;
return !elv_queue_empty(dev->rq);
}
EXPORT_SYMBOL_GPL(mtd_blktrans_cease_background);
static int mtd_blktrans_thread(void *arg)
{
struct mtd_blktrans_dev *dev = arg;
struct mtd_blktrans_ops *tr = dev->tr;
struct request_queue *rq = dev->rq;
struct request *req = NULL;
int background_done = 0;
spin_lock_irq(rq->queue_lock);
@ -131,6 +142,19 @@ static int mtd_blktrans_thread(void *arg)
int res;
if (!req && !(req = blk_fetch_request(rq))) {
if (tr->background && !background_done) {
spin_unlock_irq(rq->queue_lock);
mutex_lock(&dev->lock);
tr->background(dev);
mutex_unlock(&dev->lock);
spin_lock_irq(rq->queue_lock);
/*
* Do background processing just once per idle
* period.
*/
background_done = 1;
continue;
}
set_current_state(TASK_INTERRUPTIBLE);
if (kthread_should_stop())
@ -152,6 +176,8 @@ static int mtd_blktrans_thread(void *arg)
if (!__blk_end_request_cur(req, res))
req = NULL;
background_done = 0;
}
if (req)

2
include/linux/mtd/blktrans.h
View File

@ -62,6 +62,7 @@ struct mtd_blktrans_ops {
unsigned long block, char *buffer);
int (*discard)(struct mtd_blktrans_dev *dev,
unsigned long block, unsigned nr_blocks);
void (*background)(struct mtd_blktrans_dev *dev);
/* Block layer ioctls */
int (*getgeo)(struct mtd_blktrans_dev *dev, struct hd_geometry *geo);
@ -85,6 +86,7 @@ extern int register_mtd_blktrans(struct mtd_blktrans_ops *tr);
extern int deregister_mtd_blktrans(struct mtd_blktrans_ops *tr);
extern int add_mtd_blktrans_dev(struct mtd_blktrans_dev *dev);
extern int del_mtd_blktrans_dev(struct mtd_blktrans_dev *dev);
extern int mtd_blktrans_cease_background(struct mtd_blktrans_dev *dev);
#endif /* __MTD_TRANS_H__ */