The patch titled
Subject: umem: fix up unplugging
has been added to the -mm tree. Its filename is
umem-fix-up-unplugging.patch
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From: Tao Guo <glorioustao@xxxxxxxxx>
Subject: umem: fix up unplugging
In 7eaceaccab5f40bbf ("block: remove per-queue plugging"), Jens removed
the whole mm_unplug_device() function, which used to be the trigger to
make umem start to work.
We need to implement unplugging to make umem start to work, or I/O will
never be triggered.
Signed-off-by: Tao Guo <Tao.Guo@xxxxxxx>
Cc: Neil Brown <neilb@xxxxxxx>
Cc: Jens Axboe <axboe@xxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/block/umem.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff -puN drivers/block/umem.c~umem-fix-up-unplugging drivers/block/umem.c
--- a/drivers/block/umem.c~umem-fix-up-unplugging
+++ a/drivers/block/umem.c
@@ -513,6 +513,15 @@ static void process_page(unsigned long d
}
}
+static void mm_unplug(struct blk_plug_cb *cb)
+{
+ struct cardinfo *card = cb->q->queuedata;
+
+ spin_lock_irq(&card->lock);
+ activate(card);
+ spin_unlock_irq(&card->lock);
+}
+
static void mm_make_request(struct request_queue *q, struct bio *bio)
{
struct cardinfo *card = q->queuedata;
@@ -523,6 +532,8 @@ static void mm_make_request(struct reque
*card->biotail = bio;
bio->bi_next = NULL;
card->biotail = &bio->bi_next;
+ if (bio->bi_rw & REQ_SYNC || !blk_check_plugged(q, mm_unplug))
+ activate(card);
spin_unlock_irq(&card->lock);
return;
_
Subject: Subject: umem: fix up unplugging
Patches currently in -mm which might be from glorioustao@xxxxxxxxx are
block-move-general-unplug-callback-function-from-md-raid-to-blk-core.patch
umem-fix-up-unplugging.patch
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