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dm sysfs: introduce ability to add writable attributes 

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

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Mike Snitzer 2015-02-27 17:58:42 -05:00
parent de3ec86dff
commit b898320d68
1 changed files with 27 additions and 5 deletions
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32
drivers/md/dm-sysfs.c
View File

@ -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,