From bab2a807a489822ded0c9d4a5344c80bcac10b0a Mon Sep 17 00:00:00 2001 From: Tejun Heo Date: Fri, 8 May 2009 11:54:10 +0900 Subject: [PATCH] xd: dequeue in-flight request xd processes requests one-by-one synchronously and can be easily converted to dequeueing model. Convert it. While at it, use rq_cur_bytes instead of rq_bytes when checking for sector overflow. This is for for consistency and better behavior for merged requests. [ Impact: dequeue in-flight request ] Signed-off-by: Tejun Heo Signed-off-by: Jens Axboe --- drivers/block/xd.c | 29 +++++++++++++++++------------ 1 file changed, 17 insertions(+), 12 deletions(-) diff --git a/drivers/block/xd.c b/drivers/block/xd.c index 4ef8801..d4c4352 100644 --- a/drivers/block/xd.c +++ b/drivers/block/xd.c @@ -305,26 +305,31 @@ static void do_xd_request (struct request_queue * q) if (xdc_busy) return; - while ((req = elv_next_request(q)) != NULL) { + req = elv_next_request(q); + if (req) + blkdev_dequeue_request(req); + + while (req) { unsigned block = blk_rq_pos(req); - unsigned count = blk_rq_sectors(req); + unsigned count = blk_rq_cur_sectors(req); XD_INFO *disk = req->rq_disk->private_data; - int res = 0; + int res = -EIO; int retry; - if (!blk_fs_request(req)) { - __blk_end_request_cur(req, -EIO); - continue; - } - if (block + count > get_capacity(req->rq_disk)) { - __blk_end_request_cur(req, -EIO); - continue; - } + if (!blk_fs_request(req)) + goto done; + if (block + count > get_capacity(req->rq_disk)) + goto done; for (retry = 0; (retry < XD_RETRIES) && !res; retry++) res = xd_readwrite(rq_data_dir(req), disk, req->buffer, block, count); + done: /* wrap up, 0 = success, -errno = fail */ - __blk_end_request_cur(req, res); + if (!__blk_end_request_cur(req, res)) { + req = elv_next_request(q); + if (req) + blkdev_dequeue_request(req); + } } } -- 1.8.2.3