From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Tao Guo To: linux-kernel@vger.kernel.org Cc: Tao Guo , Tao Guo , Neil Brown , Jens Axboe , , Andrew Morton Subject: [PATCH 2/2] umem: fix up unplugging Date: Mon, 4 Jun 2012 10:41:51 -0400 Message-Id: <1338820911-4733-2-git-send-email-glorioustao@gmail.com> In-Reply-To: <1338820911-4733-1-git-send-email-glorioustao@gmail.com> References: <1338820911-4733-1-git-send-email-glorioustao@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: In that patch, 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 Cc: Neil Brown Cc: Jens Axboe Cc: Cc: Andrew Morton Cc: --- drivers/block/umem.c | 11 +++++++++++ 1 files changed, 11 insertions(+), 0 deletions(-) diff --git a/drivers/block/umem.c b/drivers/block/umem.c index aa27120..89cc9a6 100644 --- a/drivers/block/umem.c +++ b/drivers/block/umem.c @@ -513,6 +513,15 @@ static void process_page(unsigned long data) } } +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 request_queue *q, struct bio *bio) *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; -- 1.7.7.6