[PATCH v4 02/15] md/raid5: add sysfs entry to set and show stripe_size

[Yufen Yu <yuyufen@huawei.com>]

Here, we don't support setting stripe_size by sysfs.
Following patches will do that.

Signed-off-by: Yufen Yu <yuyufen@huawei.com>
---
 drivers/md/raid5.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 5c972af66978..9044b78b2f74 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -6512,6 +6512,27 @@ raid5_rmw_level = __ATTR(rmw_level, S_IRUGO | S_IWUSR,
 			 raid5_show_rmw_level,
 			 raid5_store_rmw_level);
 
+static ssize_t
+raid5_show_stripe_size(struct mddev  *mddev, char *page)
+{
+	struct r5conf *conf = mddev->private;
+
+	if (conf)
+		return sprintf(page, "%d\n", conf->stripe_size);
+	else
+		return 0;
+}
+
+static ssize_t
+raid5_store_stripe_size(struct mddev  *mddev, const char *page, size_t len)
+{
+	return -EINVAL;
+}
+
+static struct md_sysfs_entry
+raid5_stripe_size = __ATTR(stripe_size, 0644,
+			 raid5_show_stripe_size,
+			 raid5_store_stripe_size);
 
 static ssize_t
 raid5_show_preread_threshold(struct mddev *mddev, char *page)
@@ -6700,6 +6721,7 @@ static struct attribute *raid5_attrs[] =  {
 	&raid5_group_thread_cnt.attr,
 	&raid5_skip_copy.attr,
 	&raid5_rmw_level.attr,
+	&raid5_stripe_size.attr,
 	&r5c_journal_mode.attr,
 	&ppl_write_hint.attr,
 	NULL,
-- 
2.21.3