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authorBart Van Assche <bvanassche@acm.org>2020-03-09 21:26:23 -0700
committerJens Axboe <axboe@kernel.dk>2020-03-10 07:09:59 -0600
commit596444e7570587867924c3ab025183b1a8726897 (patch)
treeef51b84af05c982be1f4b8349f4a87a18ef9086d /drivers
parent9b03b713082a31a5b90e0a893c72aa620e255c26 (diff)
null_blk: Add support for init_hctx() fault injection
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>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/block/null_blk_main.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/block/null_blk_main.c b/drivers/block/null_blk_main.c
index d21c82c8863f..89bb16a99007 100644
--- a/drivers/block/null_blk_main.c
+++ b/drivers/block/null_blk_main.c
@@ -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;
}