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authorJarkko Lavinen <jarkko.lavinen@nokia.com>2011-02-14 16:16:09 +0200
committerDavid Woodhouse <David.Woodhouse@intel.com>2011-03-11 14:22:46 +0000
commitc7519dbf6f4b4408229d279d799c938ffdd06f21 (patch)
tree77952c980c6a744b8f318a4514f30cfb26a9d4df /drivers/mtd/mtd_blkdevs.c
parent13ce77f46c79a3839e4c2ff9722c9416c165f498 (diff)
downloadlinux-c7519dbf6f4b4408229d279d799c938ffdd06f21.tar.bz2
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>
Diffstat (limited to 'drivers/mtd/mtd_blkdevs.c')
-rw-r--r--drivers/mtd/mtd_blkdevs.c26
1 files changed, 26 insertions, 0 deletions
diff --git a/drivers/mtd/mtd_blkdevs.c b/drivers/mtd/mtd_blkdevs.c
index 344ac1037ee7..e0b5f6442171 100644
--- a/drivers/mtd/mtd_blkdevs.c
+++ b/drivers/mtd/mtd_blkdevs.c
@@ -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)