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block: add fault injection mechanism for faking request timeouts

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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>
This commit is contained in:
Jens Axboe
2008-09-14 05:56:33 -07:00
parent 0a0d96b03a
commit 581d4e28d9
6 changed files with 94 additions and 1 deletions
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block/blk.h
+12
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@@ -42,6 +42,18 @@ static inline void blk_clear_rq_complete(struct request *rq)
clear_bit(REQ_ATOM_COMPLETE, &rq->atomic_flags);
}
#ifdef CONFIG_FAIL_IO_TIMEOUT
int blk_should_fake_timeout(struct request_queue *);
ssize_t part_timeout_show(struct device *, struct device_attribute *, char *);
ssize_t part_timeout_store(struct device *, struct device_attribute *,
const char *, size_t);
#else
static inline int blk_should_fake_timeout(struct request_queue *q)
{
return 0;
}
#endif
struct io_context *current_io_context(gfp_t gfp_flags, int node);
int ll_back_merge_fn(struct request_queue *q, struct request *req,