[PATCH] add sysfs attr to re-emit device hotplug event

[linux-2.6-block.git] / drivers / block / genhd.c

diff --git a/drivers/block/genhd.c b/drivers/block/genhd.c
index d42840cc0d1dfcd0fad18fca25041c04ac69661a..486ce1fdeb8c889e6c14950693d30fb7c1067563 100644 (file)
--- 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,