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Commit b898320d authored by Mike Snitzer's avatar Mike Snitzer
Browse files

dm sysfs: introduce ability to add writable attributes 



Add DM_ATTR_RW() macro and establish .store method in dm_sysfs_ops.

Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
parent de3ec86d

drivers/md/dm-sysfs.c

+27 −5
Original line number Diff line number Diff line
@@ -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))
@@ -77,12 +102,9 @@ static struct attribute *dm_attrs[] = { 


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,