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 95822ae..50b61c3 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -1105,6 +1105,22 @@
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 @@
.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
--- a/fs/partitions/check.c
+++ b/fs/partitions/check.c
@@ -366,10 +366,20 @@
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)