block: genhd: Add disk/partition specific uevent callbacks for partition info

	For disk devices, a new uevent parameter 'NPARTS' specifies the number
of partitions detected by the kernel. Partition devices get 'PARTN' which
specifies the partitions index in the table.

Signed-off-by: San Mehat <san@google.com>

diff --git a/block/genhd.c b/block/genhd.c
index 3608289..cbf7b88 100644 (file)
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -1105,6 +1105,22 @@ static void disk_release(struct device *dev)
        free_part_info(&disk->part0);
        kfree(disk);
 }
+
+static int disk_uevent(struct device *dev, struct kobj_uevent_env *env)
+{
+       struct gendisk *disk = dev_to_disk(dev);
+       struct disk_part_iter piter;
+       struct hd_struct *part;
+       int cnt = 0;
+
+       disk_part_iter_init(&piter, disk, 0);
+       while((part = disk_part_iter_next(&piter)))
+               cnt++;
+       disk_part_iter_exit(&piter);
+       add_uevent_var(env, "NPARTS=%u", cnt);
+       return 0;
+}
+
 struct class block_class = {
        .name           = "block",
 };
@@ -1123,6 +1139,7 @@ static struct device_type disk_type = {
        .groups         = disk_attr_groups,
        .release        = disk_release,
        .devnode        = block_devnode,
+       .uevent         = disk_uevent,
 };
 
 #ifdef CONFIG_PROC_FS

diff --git a/fs/partitions/check.c b/fs/partitions/check.c
index d545e97..d9b8329 100644 (file)
--- a/fs/partitions/check.c
+++ b/fs/partitions/check.c
@@ -366,10 +366,20 @@ static void part_release(struct device *dev)
        kfree(p);
 }
 
+static int part_uevent(struct device *dev, struct kobj_uvent_env *env)
+{
+       struct gendisk *disk = dev_to_disk(dev);
+       struct hd_struct *part = dev_to_part(dev);
+
+       add_uevent_var(env, "PARTN=%u", part->partno);
+       return 0;
+}
+
 struct device_type part_type = {
        .name           = "partition",
        .groups         = part_attr_groups,
        .release        = part_release,
+       .uevent         = part_uevent,
 };
 
 static void delete_partition_rcu_cb(struct rcu_head *head)