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path: root/drivers/mtd/mtd_blkdevs.c
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Diffstat (limited to 'drivers/mtd/mtd_blkdevs.c')
-rw-r--r--drivers/mtd/mtd_blkdevs.c42
1 files changed, 36 insertions, 6 deletions
diff --git a/drivers/mtd/mtd_blkdevs.c b/drivers/mtd/mtd_blkdevs.c
index e0a2373bf0e2..a534e1f0c348 100644
--- a/drivers/mtd/mtd_blkdevs.c
+++ b/drivers/mtd/mtd_blkdevs.c
@@ -40,7 +40,7 @@
static LIST_HEAD(blktrans_majors);
static DEFINE_MUTEX(blktrans_ref_mutex);
-void blktrans_dev_release(struct kref *kref)
+static void blktrans_dev_release(struct kref *kref)
{
struct mtd_blktrans_dev *dev =
container_of(kref, struct mtd_blktrans_dev, ref);
@@ -67,7 +67,7 @@ unlock:
return dev;
}
-void blktrans_dev_put(struct mtd_blktrans_dev *dev)
+static void blktrans_dev_put(struct mtd_blktrans_dev *dev)
{
mutex_lock(&blktrans_ref_mutex);
kref_put(&dev->ref, blktrans_dev_release);
@@ -119,18 +119,43 @@ 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 dev->bg_stop;
+}
+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);
while (!kthread_should_stop()) {
int res;
+ dev->bg_stop = false;
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 = !dev->bg_stop;
+ continue;
+ }
set_current_state(TASK_INTERRUPTIBLE);
if (kthread_should_stop())
@@ -152,6 +177,8 @@ static int mtd_blktrans_thread(void *arg)
if (!__blk_end_request_cur(req, res))
req = NULL;
+
+ background_done = 0;
}
if (req)
@@ -172,8 +199,10 @@ static void mtd_blktrans_request(struct request_queue *rq)
if (!dev)
while ((req = blk_fetch_request(rq)) != NULL)
__blk_end_request_all(req, -ENODEV);
- else
+ else {
+ dev->bg_stop = true;
wake_up_process(dev->thread);
+ }
}
static int blktrans_open(struct block_device *bdev, fmode_t mode)
@@ -379,9 +408,10 @@ int add_mtd_blktrans_dev(struct mtd_blktrans_dev *new)
new->rq->queuedata = new;
blk_queue_logical_block_size(new->rq, tr->blksize);
- if (tr->discard)
- queue_flag_set_unlocked(QUEUE_FLAG_DISCARD,
- new->rq);
+ if (tr->discard) {
+ queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, new->rq);
+ new->rq->limits.max_discard_sectors = UINT_MAX;
+ }
gd->queue = new->rq;