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Show data device numbers in sysfs file

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It can be handy to associate mounts with their sysfs directory by their
data device number.

Signed-off-by: Zach Brown <zab@versity.com>
This commit is contained in:
Zach Brown
2022-03-25 14:30:15 -07:00
parent 7fd03dc311
commit c8d7221ec5
1 changed files with 10 additions and 0 deletions
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10
kmod/src/sysfs.c
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@@ -37,6 +37,15 @@ struct attr_funcs {
#define ATTR_FUNCS_RO(_name) \
static struct attr_funcs _name##_attr_funcs = __ATTR_RO(_name)
static ssize_t data_device_maj_min_show(struct kobject *kobj, struct attribute *attr, char *buf)
{
struct super_block *sb = KOBJ_TO_SB(kobj, sb_id_kobj);
return snprintf(buf, PAGE_SIZE, "%u:%u\n",
MAJOR(sb->s_bdev->bd_dev), MINOR(sb->s_bdev->bd_dev));
}
ATTR_FUNCS_RO(data_device_maj_min);
static ssize_t format_version_show(struct kobject *kobj, struct attribute *attr,
char *buf)
{
@@ -101,6 +110,7 @@ static ssize_t attr_funcs_show(struct kobject *kobj, struct attribute *attr,
static struct attribute *sb_id_attrs[] = {
&data_device_maj_min_attr_funcs.attr,
&format_version_attr_funcs.attr,
&fsid_attr_funcs.attr,
&rid_attr_funcs.attr,