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md: implement ->free_disk 

Ensure that all private data is only freed once all accesses are done.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Song Liu <song@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2022-07-19 11:18:17 +02:00 committed by Jens Axboe
parent c57094a6e1
commit e8c59ac419
1 changed files with 12 additions and 6 deletions
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18
drivers/md/md.c
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@ -5600,12 +5600,6 @@ static void md_free(struct kobject *ko)
del_gendisk(mddev->gendisk);
put_disk(mddev->gendisk);
percpu_ref_exit(&mddev->writes_pending);
bioset_exit(&mddev->bio_set);
bioset_exit(&mddev->sync_set);
kfree(mddev);
}
static const struct sysfs_ops md_sysfs_ops = {
@ -7875,6 +7869,17 @@ static unsigned int md_check_events(struct gendisk *disk, unsigned int clearing)
return ret;
}
static void md_free_disk(struct gendisk *disk)
{
struct mddev *mddev = disk->private_data;
percpu_ref_exit(&mddev->writes_pending);
bioset_exit(&mddev->bio_set);
bioset_exit(&mddev->sync_set);
kfree(mddev);
}
const struct block_device_operations md_fops =
{
.owner = THIS_MODULE,
@ -7888,6 +7893,7 @@ const struct block_device_operations md_fops =
.getgeo = md_getgeo,
.check_events = md_check_events,
.set_read_only = md_set_read_only,
.free_disk = md_free_disk,
};
static int md_thread(void *arg)