[PATCH] add sysfs attr to re-emit device hotplug event
A "coldplug + udevstart" can be simple like this:
for i in /sys/block/*/*/uevent; do echo 1 > $i; done
for i in /sys/class/*/*/uevent; do echo 1 > $i; done
for i in /sys/bus/*/devices/*/uevent; do echo 1 > $i; done
Signed-off-by: Kay Sievers <kay.sievers@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/fs/partitions/check.c b/fs/partitions/check.c
index 77e178f..d95a110 100644
--- a/fs/partitions/check.c
+++ b/fs/partitions/check.c
@@ -192,6 +192,7 @@
struct part_attribute {
struct attribute attr;
ssize_t (*show)(struct hd_struct *,char *);
+ ssize_t (*store)(struct hd_struct *,const char *, size_t);
};
static ssize_t
@@ -201,14 +202,33 @@
struct part_attribute * part_attr = container_of(attr,struct part_attribute,attr);
ssize_t ret = 0;
if (part_attr->show)
- ret = part_attr->show(p,page);
+ ret = part_attr->show(p, page);
+ return ret;
+}
+static ssize_t
+part_attr_store(struct kobject * kobj, struct attribute * attr,
+ const char *page, size_t count)
+{
+ struct hd_struct * p = container_of(kobj,struct hd_struct,kobj);
+ struct part_attribute * part_attr = container_of(attr,struct part_attribute,attr);
+ ssize_t ret = 0;
+
+ if (part_attr->store)
+ ret = part_attr->store(p, page, count);
return ret;
}
static struct sysfs_ops part_sysfs_ops = {
.show = part_attr_show,
+ .store = part_attr_store,
};
+static ssize_t part_uevent_store(struct hd_struct * p,
+ const char *page, size_t count)
+{
+ kobject_hotplug(&p->kobj, KOBJ_ADD);
+ return count;
+}
static ssize_t part_dev_read(struct hd_struct * p, char *page)
{
struct gendisk *disk = container_of(p->kobj.parent,struct gendisk,kobj);
@@ -229,6 +249,10 @@
p->reads, (unsigned long long)p->read_sectors,
p->writes, (unsigned long long)p->write_sectors);
}
+static struct part_attribute part_attr_uevent = {
+ .attr = {.name = "uevent", .mode = S_IWUSR },
+ .store = part_uevent_store
+};
static struct part_attribute part_attr_dev = {
.attr = {.name = "dev", .mode = S_IRUGO },
.show = part_dev_read
@@ -247,6 +271,7 @@
};
static struct attribute * default_attrs[] = {
+ &part_attr_uevent.attr,
&part_attr_dev.attr,
&part_attr_start.attr,
&part_attr_size.attr,