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

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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>
This commit is contained in:
San Mehat
2009-10-10 09:35:24 -07:00
committed by Colin Cross
parent 5ef087073b
commit 5fec81a237
2 changed files with 27 additions and 0 deletions
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17
block/genhd.c
View File

@@ -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

10
fs/partitions/check.c
View File

@@ -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)