From f2f1fa78a155524b849edf359e42a3001ea652c0 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Fri, 5 Dec 2008 14:49:18 -0800 Subject: [PATCH] Enforce a minimum SG_IO timeout There's no point in having too short SG_IO timeouts, since if the command does end up timing out, we'll end up through the reset sequence that is several seconds long in order to abort the command that timed out. As a result, shorter timeouts than a few seconds simply do not make sense, as the recovery would be longer than the timeout itself. Add a BLK_MIN_SG_TIMEOUT to match the existign BLK_DEFAULT_SG_TIMEOUT. Suggested-by: Alan Cox Acked-by: Tejun Heo Acked-by: Jens Axboe Cc: Jeff Garzik Signed-off-by: Linus Torvalds --- block/bsg.c | 2 ++ block/scsi_ioctl.c | 2 ++ include/linux/blkdev.h | 1 + 3 files changed, 5 insertions(+) diff --git a/block/bsg.c b/block/bsg.c index e8bd247..e73e50d 100644 --- a/block/bsg.c +++ b/block/bsg.c @@ -202,6 +202,8 @@ static int blk_fill_sgv4_hdr_rq(struct request_queue *q, struct request *rq, rq->timeout = q->sg_timeout; if (!rq->timeout) rq->timeout = BLK_DEFAULT_SG_TIMEOUT; + if (rq->timeout < BLK_MIN_SG_TIMEOUT) + rq->timeout = BLK_MIN_SG_TIMEOUT; return 0; } diff --git a/block/scsi_ioctl.c b/block/scsi_ioctl.c index 5963cf9..d0bb92c 100644 --- a/block/scsi_ioctl.c +++ b/block/scsi_ioctl.c @@ -208,6 +208,8 @@ static int blk_fill_sghdr_rq(struct request_queue *q, struct request *rq, rq->timeout = q->sg_timeout; if (!rq->timeout) rq->timeout = BLK_DEFAULT_SG_TIMEOUT; + if (rq->timeout < BLK_MIN_SG_TIMEOUT) + rq->timeout = BLK_MIN_SG_TIMEOUT; return 0; } diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 6dcd30d..031a315 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -662,6 +662,7 @@ extern unsigned long blk_max_low_pfn, blk_max_pfn; * default timeout for SG_IO if none specified */ #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ) +#define BLK_MIN_SG_TIMEOUT (7 * HZ) #ifdef CONFIG_BOUNCE extern int init_emergency_isa_pool(void); -- 1.8.2.3