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block: add io timeout to sysfs 

Give a interface to adjust io timeout(ms) by device.

Signed-off-by: Weiping Zhang <zhangweiping@didiglobal.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Weiping Zhang 2018-11-29 00:04:39 +08:00 committed by Jens Axboe
parent 94a2c3a32b
commit 65cd1d13b8
1 changed files with 27 additions and 0 deletions
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27
block/blk-sysfs.c
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@ -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", jiffies_to_msecs(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 || val == 0)
return -EINVAL;
blk_queue_rq_timeout(q, msecs_to_jiffies(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