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>

diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index 80eef48fddc80756de9c3e5005a9a9f929cce3d4..9f0cb370b39b029049145c1d2a780c686717af60 100644 (file)
--- 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", 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