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/block/blk-softirq.c b/block/blk-softirq.c
index 7ab344a..e660d26 100644
--- a/block/blk-softirq.c
+++ b/block/blk-softirq.c
@@ -154,6 +154,8 @@
**/
void blk_complete_request(struct request *req)
{
+ if (unlikely(blk_should_fake_timeout(req->q)))
+ return;
if (!blk_mark_rq_complete(req))
__blk_complete_request(req);
}