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Linus Torvalds f2f1fa78a1 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 <alan@lxorguk.ukuu.org.uk>
Acked-by: Tejun Heo <tj@kernel.org>
Acked-by: Jens Axboe <jens.axboe@oracle.com>
Cc: Jeff Garzik <jeff@garzik.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-12-05 14:49:18 -08:00
..
as-iosched.c block: as/cfq ssd idle check update 2008-10-09 08:56:19 +02:00
blk-barrier.c block: internal dequeue shouldn't start timer 2008-12-03 12:41:26 +01:00
blk-core.c block: fix setting of max_segment_size and seg_boundary mask 2008-12-03 12:55:55 +01:00
blk-exec.c Add some block/ source files to the kernel-api docbook. Fix kernel-doc notation in them as needed. Fix changed function parameter names. Fix typos/spellos. In comments, change REQ_SPECIAL to REQ_TYPE_SPECIAL and REQ_BLOCK_PC to REQ_TYPE_BLOCK_PC. 2008-10-09 08:56:03 +02:00
blk-integrity.c block: Switch blk_integrity_compare from bdev to gendisk 2008-10-09 08:56:21 +02:00
blk-ioc.c cfq-iosched: fix RCU race in the cfq io_context destructor handling 2008-05-07 09:28:57 +02:00
blk-map.c When block layer fails to map iov, it calls bio_unmap_user to undo 2008-12-03 12:41:20 +01:00
blk-merge.c block: remove unused ll_new_mergeable() 2008-11-06 08:41:55 +01:00
blk-settings.c block: fix setting of max_segment_size and seg_boundary mask 2008-12-03 12:55:55 +01:00
blk-softirq.c block: add fault injection mechanism for faking request timeouts 2008-10-09 08:56:17 +02:00
blk-sysfs.c block: add support for IO CPU affinity 2008-10-09 08:56:09 +02:00
blk-tag.c block: reserve some tags just for sync IO 2008-10-09 08:56:19 +02:00
blk-timeout.c Block: use round_jiffies_up() 2008-11-06 08:42:49 +01:00
blk.h block: remove __generic_unplug_device() from exports 2008-10-17 14:03:08 +02:00
blktrace.c blktrace: use BLKTRACE_BDEV_SIZE as the name size for setup structure 2008-10-09 08:56:20 +02:00
bsg.c Enforce a minimum SG_IO timeout 2008-12-05 14:49:18 -08:00
cfq-iosched.c block: as/cfq ssd idle check update 2008-10-09 08:56:19 +02:00
cmd-filter.c [PATCH] introduce fmode_t, do annotations 2008-10-21 07:47:06 -04:00
compat_ioctl.c [PATCH 1/2] kill FMODE_NDELAY_NOW 2008-12-04 04:22:57 -05:00
deadline-iosched.c deadline-iosched: non-functional fixes 2008-10-09 08:56:03 +02:00
elevator.c block: internal dequeue shouldn't start timer 2008-12-03 12:41:26 +01:00
genhd.c block: set disk->node_id before it's being used 2008-12-03 12:41:20 +01:00
ioctl.c block: make add_partition() return pointer to hd_struct 2008-11-18 15:08:56 +01:00
Kconfig block: Block layer data integrity support 2008-07-03 13:21:13 +02:00
Kconfig.iosched update I/O sched Kconfig help texts - CFQ is now default, not AS. 2007-02-17 20:08:22 +01:00
Makefile block: unify request timeout handling 2008-10-09 08:56:13 +02:00
noop-iosched.c block: let elv_register() return void 2007-12-18 08:29:28 +01:00
scsi_ioctl.c Enforce a minimum SG_IO timeout 2008-12-05 14:49:18 -08:00