On Thu 26-11-20 18:35:18, Jan Kara wrote:
> On Thu 26-11-20 14:04:14, Christoph Hellwig wrote:
> > Allocate hd_struct together with struct block_device to pre-load
> > the lifetime rule changes in preparation of merging the two structures.
> >
> > Note that part0 was previously embedded into struct gendisk, but is
> > a separate allocation now, and already points to the block_device instead
> > of the hd_struct. The lifetime of struct gendisk is still controlled by
> > the struct device embedded in the part0 hd_struct.
> >
> > Signed-off-by: Christoph Hellwig <[email protected]>
>
> Just one comment below. With that fixed feel free to add:
>
> Reviewed-by: Jan Kara <[email protected]>
>
> > diff --git a/block/partitions/core.c b/block/partitions/core.c
> > index f397ec9922bd6e..9c7e6730fa6098 100644
> > --- a/block/partitions/core.c
> > +++ b/block/partitions/core.c
> > @@ -265,9 +265,9 @@ 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);
> > - hd_free_part(p);
> > - kfree(p);
> > + bdput(p->bdev);
> > }
>
> I don't think hd_struct holds a reference to block_device, does it?
> bdev_alloc() now just assigns bdev->bd_part->bdev = bdev...
Now I understood this is probably correct - each partition (including
gendisk as 0 partition) holds the initial bdev reference and only when
corresponding kobject is getting destroyed we stop holding onto that
reference. Right?
Honza
--
Jan Kara <[email protected]>
SUSE Labs, CR
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