block: add fault injection mechanism for faking request timeouts
Only works for the generic request timer handling. Allows one to
sporadically ignore request completions, thus exercising the timeout
handling.
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index b47767c..e34999d 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -440,6 +440,7 @@
#define QUEUE_FLAG_BIDI 9 /* queue supports bidi requests */
#define QUEUE_FLAG_NOMERGES 10 /* disable merge attempts */
#define QUEUE_FLAG_SAME_COMP 11 /* force complete on same CPU */
+#define QUEUE_FLAG_FAIL_IO 12 /* fake timeout */
static inline int queue_is_locked(struct request_queue *q)
{