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Diffstat (limited to 'drivers/md/dm-sysfs.c')
-rw-r--r--drivers/md/dm-sysfs.c43
1 files changed, 38 insertions, 5 deletions
diff --git a/drivers/md/dm-sysfs.c b/drivers/md/dm-sysfs.c
index c62c5ab6aed5..7e818f5f1dc4 100644
--- a/drivers/md/dm-sysfs.c
+++ b/drivers/md/dm-sysfs.c
@@ -11,7 +11,7 @@
struct dm_sysfs_attr {
struct attribute attr;
ssize_t (*show)(struct mapped_device *, char *);
- ssize_t (*store)(struct mapped_device *, char *);
+ ssize_t (*store)(struct mapped_device *, const char *, size_t count);
};
#define DM_ATTR_RO(_name) \
@@ -39,6 +39,31 @@ static ssize_t dm_attr_show(struct kobject *kobj, struct attribute *attr,
return ret;
}
+#define DM_ATTR_RW(_name) \
+struct dm_sysfs_attr dm_attr_##_name = \
+ __ATTR(_name, S_IRUGO | S_IWUSR, dm_attr_##_name##_show, dm_attr_##_name##_store)
+
+static ssize_t dm_attr_store(struct kobject *kobj, struct attribute *attr,
+ const char *page, size_t count)
+{
+ struct dm_sysfs_attr *dm_attr;
+ struct mapped_device *md;
+ ssize_t ret;
+
+ dm_attr = container_of(attr, struct dm_sysfs_attr, attr);
+ if (!dm_attr->store)
+ return -EIO;
+
+ md = dm_get_from_kobject(kobj);
+ if (!md)
+ return -EINVAL;
+
+ ret = dm_attr->store(md, page, count);
+ dm_put(md);
+
+ return ret;
+}
+
static ssize_t dm_attr_name_show(struct mapped_device *md, char *buf)
{
if (dm_copy_name_and_uuid(md, buf, NULL))
@@ -64,25 +89,33 @@ static ssize_t dm_attr_suspended_show(struct mapped_device *md, char *buf)
return strlen(buf);
}
+static ssize_t dm_attr_use_blk_mq_show(struct mapped_device *md, char *buf)
+{
+ sprintf(buf, "%d\n", dm_use_blk_mq(md));
+
+ return strlen(buf);
+}
+
static DM_ATTR_RO(name);
static DM_ATTR_RO(uuid);
static DM_ATTR_RO(suspended);
+static DM_ATTR_RO(use_blk_mq);
+static DM_ATTR_RW(rq_based_seq_io_merge_deadline);
static struct attribute *dm_attrs[] = {
&dm_attr_name.attr,
&dm_attr_uuid.attr,
&dm_attr_suspended.attr,
+ &dm_attr_use_blk_mq.attr,
+ &dm_attr_rq_based_seq_io_merge_deadline.attr,
NULL,
};
static const struct sysfs_ops dm_sysfs_ops = {
.show = dm_attr_show,
+ .store = dm_attr_store,
};
-/*
- * dm kobject is embedded in mapped_device structure
- * no need to define release function here
- */
static struct kobj_type dm_ktype = {
.sysfs_ops = &dm_sysfs_ops,
.default_attrs = dm_attrs,