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block: don't show io_timeout if driver has no timeout handler 

If the low level driver has no timeout handler, the
/sys/block/<disk>/queue/io_timeout will not be displayed.

Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Weiping Zhang <zhangweiping@didiglobal.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Weiping Zhang 2019-04-02 21:14:30 +08:00 committed by Jens Axboe
parent f9f76879bc
commit 4d25339e32
1 changed files with 28 additions and 2 deletions
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30
block/blk-sysfs.c
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@ -728,7 +728,7 @@ static struct queue_sysfs_entry throtl_sample_time_entry = {
};
#endif
static struct attribute *default_attrs[] = {
static struct attribute *queue_attrs[] = {
&queue_requests_entry.attr,
&queue_ra_entry.attr,
&queue_max_hw_sectors_entry.attr,
@ -770,6 +770,25 @@ static struct attribute *default_attrs[] = {
NULL,
};
static umode_t queue_attr_visible(struct kobject *kobj, struct attribute *attr,
int n)
{
struct request_queue *q =
container_of(kobj, struct request_queue, kobj);
if (attr == &queue_io_timeout_entry.attr &&
(!q->mq_ops || !q->mq_ops->timeout))
return 0;
return attr->mode;
}
static struct attribute_group queue_attr_group = {
.attrs = queue_attrs,
.is_visible = queue_attr_visible,
};
#define to_queue(atr) container_of((atr), struct queue_sysfs_entry, attr)
static ssize_t
@ -890,7 +909,6 @@ static const struct sysfs_ops queue_sysfs_ops = {
struct kobj_type blk_queue_ktype = {
.sysfs_ops = &queue_sysfs_ops,
.default_attrs = default_attrs,
.release = blk_release_queue,
};
@ -939,6 +957,14 @@ int blk_register_queue(struct gendisk *disk)
goto unlock;
}
ret = sysfs_create_group(&q->kobj, &queue_attr_group);
if (ret) {
blk_trace_remove_sysfs(dev);
kobject_del(&q->kobj);
kobject_put(&dev->kobj);
goto unlock;
}
if (queue_is_mq(q)) {
__blk_mq_register_dev(dev, q);
blk_mq_debugfs_register(q);