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Message-Id: <20200304191644.25220-1-dongli.zhang@oracle.com>
Date: Wed, 4 Mar 2020 11:16:44 -0800
From: Dongli Zhang <dongli.zhang@...cle.com>
To: linux-block@...r.kernel.org
Cc: axboe@...nel.dk, linux-kernel@...r.kernel.org
Subject: [PATCH 1/1] null_blk: describe the usage of fault injection param
As null_blk is a very good start point to test block layer, this patch adds
description and comments to 'timeout' and 'requeue' to explain how to use
fault injection with null_blk.
The nvme has similar with nvme_core.fail_request in the form of comment.
Signed-off-by: Dongli Zhang <dongli.zhang@...cle.com>
---
drivers/block/null_blk_main.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/block/null_blk_main.c b/drivers/block/null_blk_main.c
index 133060431dbd..1ee5aaacdb0f 100644
--- a/drivers/block/null_blk_main.c
+++ b/drivers/block/null_blk_main.c
@@ -96,11 +96,17 @@ module_param_named(home_node, g_home_node, int, 0444);
MODULE_PARM_DESC(home_node, "Home node for the device");
#ifdef CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION
+/*
+ * For more details about fault injection, please refer to
+ * Documentation/fault-injection/fault-injection.rst.
+ */
static char g_timeout_str[80];
module_param_string(timeout, g_timeout_str, sizeof(g_timeout_str), 0444);
+MODULE_PARM_DESC(timeout, "Fault injection. timeout=<interval>,<probability>,<space>,<times>");
static char g_requeue_str[80];
module_param_string(requeue, g_requeue_str, sizeof(g_requeue_str), 0444);
+MODULE_PARM_DESC(requeue, "Fault injection. requeue=<interval>,<probability>,<space>,<times>");
#endif
static int g_queue_mode = NULL_Q_MQ;
--
2.17.1
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