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block: Fix dev_t minor allocation lifetime

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Releases the dev_t minor when all references are closed to prevent
another device from acquiring the same major/minor.

Since the partition's release may be invoked from call_rcu's soft-irq
context, the ext_dev_idr's mutex had to be replaced with a spinlock so
as not so sleep.

Signed-off-by: Keith Busch <[email protected]>
Cc: [email protected]
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Keith Busch 2014-08-26 09:05:36 -06:00 • committed by Jens Axboe
commit 2da78092dd
2 changed files with 15 additions and 11 deletions
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2
block/partition-generic.c
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@ -211,6 +211,7 @@ static const struct attribute_group *part_attr_groups[] = {
static void part_release(struct device *dev)
{
struct hd_struct *p = dev_to_part(dev);
blk_free_devt(dev->devt);
free_part_stats(p);
free_part_info(p);
kfree(p);
@ -253,7 +254,6 @@ void delete_partition(struct gendisk *disk, int partno)
rcu_assign_pointer(ptbl->last_lookup, NULL);
kobject_put(part->holder_dir);
device_del(part_to_dev(part));
blk_free_devt(part_devt(part));
hd_struct_put(part);
}