From: Weiping Zhang <zhangweiping@didiglobal.com>
To: <axboe@kernel.dk>
Cc: <linux-block@vger.kernel.org>
Subject: [RFC] block: add io timeout to sysfs
Date: Sat, 17 Nov 2018 23:49:20 +0800 [thread overview]
Message-ID: <20181117154912.GA34586@192.168.3.9> (raw)
Give a interface to adjust io timeout by device.
Signed-off-by: Weiping Zhang <zhangweiping@didiglobal.com>
---
block/blk-sysfs.c | 27 +++++++++++++++++++++++++++
1 file changed, 27 insertions(+)
diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index 80eef48fddc8..0cabfb935e71 100644
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -417,6 +417,26 @@ static ssize_t queue_poll_store(struct request_queue *q, const char *page,
return ret;
}
+static ssize_t queue_io_timeout_show(struct request_queue *q, char *page)
+{
+ return sprintf(page, "%u\n", q->rq_timeout);
+}
+
+static ssize_t queue_io_timeout_store(struct request_queue *q, const char *page,
+ size_t count)
+{
+ unsigned int val;
+ int err;
+
+ err = kstrtou32(page, 10, &val);
+ if (err)
+ return -EINVAL;
+
+ blk_queue_rq_timeout(q, val);
+
+ return count;
+}
+
static ssize_t queue_wb_lat_show(struct request_queue *q, char *page)
{
if (!wbt_rq_qos(q))
@@ -685,6 +705,12 @@ static struct queue_sysfs_entry queue_dax_entry = {
.show = queue_dax_show,
};
+static struct queue_sysfs_entry queue_io_timeout_entry = {
+ .attr = {.name = "io_timeout", .mode = 0644 },
+ .show = queue_io_timeout_show,
+ .store = queue_io_timeout_store,
+};
+
static struct queue_sysfs_entry queue_wb_lat_entry = {
.attr = {.name = "wbt_lat_usec", .mode = 0644 },
.show = queue_wb_lat_show,
@@ -734,6 +760,7 @@ static struct attribute *default_attrs[] = {
&queue_dax_entry.attr,
&queue_wb_lat_entry.attr,
&queue_poll_delay_entry.attr,
+ &queue_io_timeout_entry.attr,
#ifdef CONFIG_BLK_DEV_THROTTLING_LOW
&throtl_sample_time_entry.attr,
#endif
--
2.14.1
reply other threads:[~2018-11-17 16:00 UTC|newest]
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