]> pilppa.com Git - linux-2.6-omap-h63xx.git/commit
[PATCH] fault-injection capability for disk IO
authorAkinobu Mita <akinobu.mita@gmail.com>
Fri, 8 Dec 2006 10:39:46 +0000 (02:39 -0800)
committerLinus Torvalds <torvalds@woody.osdl.org>
Fri, 8 Dec 2006 16:29:02 +0000 (08:29 -0800)
commitc17bb4951752d3e0f49cd1ea9d2e868422f9e0d6
treedcd23ef706ba09edae462528dc11a507b1d17af6
parent933e312e73f8fc39652bd4d216a5393cc3a014b9
[PATCH] fault-injection capability for disk IO

This patch provides fault-injection capability for disk IO.

Boot option:

fail_make_request=<probability>,<interval>,<space>,<times>

<interval> -- specifies the interval of failures.

<probability> -- specifies how often it should fail in percent.

<space> -- specifies the size of free space where disk IO can be issued
   safely in bytes.

<times> -- specifies how many times failures may happen at most.

Debugfs:

/debug/fail_make_request/interval
/debug/fail_make_request/probability
/debug/fail_make_request/specifies
/debug/fail_make_request/times

Example:

fail_make_request=10,100,0,-1
echo 1 > /sys/blocks/hda/hda1/make-it-fail

generic_make_request() on /dev/hda1 fails once per 10 times.

Cc: Jens Axboe <axboe@suse.de>
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
block/genhd.c
block/ll_rw_blk.c
fs/partitions/check.c
include/linux/genhd.h
lib/Kconfig.debug