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null_blk: Add support for init_hctx() fault injection

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This makes it possible to test the error path in blk_mq_realloc_hw_ctxs()
and also several error paths in null_blk.

Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Cc: Johannes Thumshirn <jth@kernel.org>
Cc: Hannes Reinecke <hare@suse.com>
Cc: Ming Lei <ming.lei@redhat.com>
Cc: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Bart Van Assche 2020-03-09 21:26:23 -07:00 committed by Jens Axboe
parent 9b03b71308
commit 596444e757
1 changed files with 11 additions and 0 deletions
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11
drivers/block/null_blk_main.c
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@ -23,6 +23,7 @@
#ifdef CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION
static DECLARE_FAULT_ATTR(null_timeout_attr);
static DECLARE_FAULT_ATTR(null_requeue_attr);
static DECLARE_FAULT_ATTR(null_init_hctx_attr);
#endif
static inline u64 mb_per_tick(int mbps)
@ -101,6 +102,9 @@ module_param_string(timeout, g_timeout_str, sizeof(g_timeout_str), 0444);
static char g_requeue_str[80];
module_param_string(requeue, g_requeue_str, sizeof(g_requeue_str), 0444);
static char g_init_hctx_str[80];
module_param_string(init_hctx, g_init_hctx_str, sizeof(g_init_hctx_str), 0444);
#endif
static int g_queue_mode = NULL_Q_MQ;
@ -1451,6 +1455,11 @@ static int null_init_hctx(struct blk_mq_hw_ctx *hctx, void *driver_data,
struct nullb *nullb = hctx->queue->queuedata;
struct nullb_queue *nq;
#ifdef CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION
if (g_init_hctx_str[0] && should_fail(&null_init_hctx_attr, 1))
return -EFAULT;
#endif
nq = &nullb->queues[hctx_idx];
hctx->driver_data = nq;
null_init_queue(nullb, nq);
@ -1683,6 +1692,8 @@ static bool null_setup_fault(void)
return false;
if (!__null_setup_fault(&null_requeue_attr, g_requeue_str))
return false;
if (!__null_setup_fault(&null_init_hctx_attr, g_init_hctx_str))
return false;
#endif
return true;
}