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| author | Akinobu Mita <akinobu.mita@gmail.com> | 2006-12-08 02:39:46 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.osdl.org> | 2006-12-08 08:29:02 -0800 |
| commit | c17bb4951752d3e0f49cd1ea9d2e868422f9e0d6 (patch) | |
| tree | dcd23ef706ba09edae462528dc11a507b1d17af6 /include/linux/genhd.h | |
| parent | 933e312e73f8fc39652bd4d216a5393cc3a014b9 (diff) | |
| download | lwn-c17bb4951752d3e0f49cd1ea9d2e868422f9e0d6.tar.gz lwn-c17bb4951752d3e0f49cd1ea9d2e868422f9e0d6.zip | |
[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>
Diffstat (limited to 'include/linux/genhd.h')
| -rw-r--r-- | include/linux/genhd.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/genhd.h b/include/linux/genhd.h index 41f276fdd185..0a022b2f63fc 100644 --- a/include/linux/genhd.h +++ b/include/linux/genhd.h @@ -83,6 +83,9 @@ struct hd_struct { struct kobject *holder_dir; unsigned ios[2], sectors[2]; /* READs and WRITEs */ int policy, partno; +#ifdef CONFIG_FAIL_MAKE_REQUEST + int make_it_fail; +#endif }; #define GENHD_FL_REMOVABLE 1 @@ -90,6 +93,7 @@ struct hd_struct { #define GENHD_FL_CD 8 #define GENHD_FL_UP 16 #define GENHD_FL_SUPPRESS_PARTITION_INFO 32 +#define GENHD_FL_FAIL 64 struct disk_stats { unsigned long sectors[2]; /* READs and WRITEs */ |