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md: add serialize_policy sysfs node for raid1

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With the new sysfs node, we can use it to control if raid1 array
wants io serialization or not. So mddev_create_serial_pool and
mddev_destroy_serial_pool are called in serialize_policy_store
to enable or disable the serialization.

Signed-off-by: Guoqing Jiang <guoqing.jiang@cloud.ionos.com>
Signed-off-by: Song Liu <songliubraving@fb.com>
This commit is contained in:
Guoqing Jiang 2019-12-23 10:48:56 +01:00 committed by Song Liu
parent 11d3a9f650
commit 3938f5fb82
2 changed files with 53 additions and 0 deletions
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52
drivers/md/md.c
View file

@ -5304,6 +5304,57 @@ static struct md_sysfs_entry md_fail_last_dev =
__ATTR(fail_last_dev, S_IRUGO | S_IWUSR, fail_last_dev_show,
fail_last_dev_store);
static ssize_t serialize_policy_show(struct mddev *mddev, char *page)
{
if (mddev->pers == NULL || (mddev->pers->level != 1))
return sprintf(page, "n/a\n");
else
return sprintf(page, "%d\n", mddev->serialize_policy);
}
/*
* Setting serialize_policy to true to enforce write IO is not reordered
* for raid1.
*/
static ssize_t
serialize_policy_store(struct mddev *mddev, const char *buf, size_t len)
{
int err;
bool value;
err = kstrtobool(buf, &value);
if (err)
return err;
if (value == mddev->serialize_policy)
return len;
err = mddev_lock(mddev);
if (err)
return err;
if (mddev->pers == NULL || (mddev->pers->level != 1)) {
pr_err("md: serialize_policy is only effective for raid1\n");
err = -EINVAL;
goto unlock;
}
mddev_suspend(mddev);
if (value)
mddev_create_serial_pool(mddev, NULL, true);
else
mddev_destroy_serial_pool(mddev, NULL, true);
mddev->serialize_policy = value;
mddev_resume(mddev);
unlock:
mddev_unlock(mddev);
return err ?: len;
}
static struct md_sysfs_entry md_serialize_policy =
__ATTR(serialize_policy, S_IRUGO | S_IWUSR, serialize_policy_show,
serialize_policy_store);
static struct attribute *md_default_attrs[] = {
&md_level.attr,
&md_layout.attr,
@ -5321,6 +5372,7 @@ static struct attribute *md_default_attrs[] = {
&max_corr_read_errors.attr,
&md_consistency_policy.attr,
&md_fail_last_dev.attr,
&md_serialize_policy.attr,
NULL,
};

1
drivers/md/md.h
View file

@ -494,6 +494,7 @@ struct mddev {
bool has_superblocks:1;
bool fail_last_dev:1;
bool serialize_policy:1;
};
enum recovery_flags {