[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>

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 */