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authorKay Sievers <kay.sievers@suse.de>2005-10-01 14:49:43 +0200
committerGreg Kroah-Hartman <gregkh@suse.de>2005-10-28 09:52:51 -0700
commita7fd67062efc5b0fc9a61368c607fa92d1d57f9e (patch)
tree8b91f198640608bd99f4e4764394e5134220abcf /drivers/block/genhd.c
parentd8539d81aeee4dbdc0624a798321e822fb2df7ae (diff)
[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>
Diffstat (limited to 'drivers/block/genhd.c')
-rw-r--r--drivers/block/genhd.c25
1 files changed, 25 insertions, 0 deletions
diff --git a/drivers/block/genhd.c b/drivers/block/genhd.c
index d42840cc0d1..486ce1fdeb8 100644
--- a/drivers/block/genhd.c
+++ b/drivers/block/genhd.c
@@ -337,10 +337,30 @@ static ssize_t disk_attr_show(struct kobject *kobj, struct attribute *attr,
return ret;
}
+static ssize_t disk_attr_store(struct kobject * kobj, struct attribute * attr,
+ const char *page, size_t count)
+{
+ struct gendisk *disk = to_disk(kobj);
+ struct disk_attribute *disk_attr =
+ container_of(attr,struct disk_attribute,attr);
+ ssize_t ret = 0;
+
+ if (disk_attr->store)
+ ret = disk_attr->store(disk, page, count);
+ return ret;
+}
+
static struct sysfs_ops disk_sysfs_ops = {
.show = &disk_attr_show,
+ .store = &disk_attr_store,
};
+static ssize_t disk_uevent_store(struct gendisk * disk,
+ const char *buf, size_t count)
+{
+ kobject_hotplug(&disk->kobj, KOBJ_ADD);
+ return count;
+}
static ssize_t disk_dev_read(struct gendisk * disk, char *page)
{
dev_t base = MKDEV(disk->major, disk->first_minor);
@@ -382,6 +402,10 @@ static ssize_t disk_stats_read(struct gendisk * disk, char *page)
jiffies_to_msecs(disk_stat_read(disk, io_ticks)),
jiffies_to_msecs(disk_stat_read(disk, time_in_queue)));
}
+static struct disk_attribute disk_attr_uevent = {
+ .attr = {.name = "uevent", .mode = S_IWUSR },
+ .store = disk_uevent_store
+};
static struct disk_attribute disk_attr_dev = {
.attr = {.name = "dev", .mode = S_IRUGO },
.show = disk_dev_read
@@ -404,6 +428,7 @@ static struct disk_attribute disk_attr_stat = {
};
static struct attribute * default_attrs[] = {
+ &disk_attr_uevent.attr,
&disk_attr_dev.attr,
&disk_attr_range.attr,
&disk_attr_removable.attr,