From fb3ac7f6b811eac8e0aafa3df1c16ed872e898a8 Mon Sep 17 00:00:00 2001 From: Tejun Heo Date: Fri, 8 May 2009 11:54:13 +0900 Subject: [PATCH] z2ram: dequeue in-flight request z2ram processes requests one-by-one synchronously and can be easily converted to dequeueing model. Convert it. [ Impact: dequeue in-flight request ] Signed-off-by: Tejun Heo Signed-off-by: Jens Axboe --- drivers/block/z2ram.c | 19 +++++++++++++++---- 1 file changed, 15 insertions(+), 4 deletions(-) diff --git a/drivers/block/z2ram.c b/drivers/block/z2ram.c index 6a1383834ecf..c909c1a3f650 100644 --- a/drivers/block/z2ram.c +++ b/drivers/block/z2ram.c @@ -70,15 +70,21 @@ static struct gendisk *z2ram_gendisk; static void do_z2_request(struct request_queue *q) { struct request *req; - while ((req = elv_next_request(q)) != NULL) { + + req = elv_next_request(q); + if (req) + blkdev_dequeue_request(req); + + while (req) { unsigned long start = blk_rq_pos(req) << 9; unsigned long len = blk_rq_cur_bytes(req); + int err = 0; if (start + len > z2ram_size) { printk( KERN_ERR DEVICE_NAME ": bad access: block=%lu, count=%u\n", blk_rq_pos(req), blk_rq_cur_sectors(req)); - __blk_end_request_cur(req, -EIO); - continue; + err = -EIO; + goto done; } while (len) { unsigned long addr = start & Z2RAM_CHUNKMASK; @@ -93,7 +99,12 @@ static void do_z2_request(struct request_queue *q) start += size; len -= size; } - __blk_end_request_cur(req, 0); + done: + if (!__blk_end_request_cur(req, err)) { + req = elv_next_request(q); + if (req) + blkdev_dequeue_request(req); + } } }