From: Mike Snitzer <snitzer@redhat.com>
To: Christoph Hellwig <hch@lst.de>
Cc: Jens Axboe <axboe@kernel.dk>,
linux-block@vger.kernel.org, dm-devel@redhat.com,
Tushar Sugandhi <tusharsu@linux.microsoft.com>
Subject: Re: [dm-devel] holders not working properly, regression [was: Re: use regular gendisk registration in device mapper v2]
Date: Thu, 19 Aug 2021 18:08:36 -0400 [thread overview]
Message-ID: <YR7WZEZgxw6hI369@redhat.com> (raw)
In-Reply-To: <20210819180559.GA14001@lst.de>
On Thu, Aug 19 2021 at 2:05P -0400,
Christoph Hellwig <hch@lst.de> wrote:
> Manually reverting "block: remove the extra kobject reference in
> bd_link_disk_holder" as show below fixed the issue for me. I'll spend
> some more time tomorrow trying to fully understan the life time rules
> tomorrow before sending a patch, though.
>
> ---
> From 6b94f5435900d23769db8d07ff47415aab4ac63e Mon Sep 17 00:00:00 2001
> From: Christoph Hellwig <hch@lst.de>
> Date: Thu, 19 Aug 2021 20:01:43 +0200
> Subject: Revert "block: remove the extra kobject reference in
> bd_link_disk_holder"
>
> This reverts commit fbd9a39542ecdd2ade55869c13856b2590db3df8.
> ---
> block/holder.c | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> diff --git a/block/holder.c b/block/holder.c
> index 4568cc4f6827..ecbc6941e7d8 100644
> --- a/block/holder.c
> +++ b/block/holder.c
> @@ -106,6 +106,12 @@ int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk)
> }
>
> list_add(&holder->list, &disk->slave_bdevs);
> + /*
> + * bdev could be deleted beneath us which would implicitly destroy
> + * the holder directory. Hold on to it.
> + */
> + kobject_get(bdev->bd_holder_dir);
> +
> out_unlock:
> mutex_unlock(&disk->open_mutex);
> return ret;
> @@ -138,6 +144,7 @@ void bd_unlink_disk_holder(struct block_device *bdev, struct gendisk *disk)
> if (!WARN_ON_ONCE(holder == NULL) && !--holder->refcnt) {
> if (disk->slave_dir)
> __unlink_disk_holder(bdev, disk);
> + kobject_put(bdev->bd_holder_dir);
> list_del_init(&holder->list);
> kfree(holder);
> }
> --
> 2.30.2
>
OK, this fixed it for me too, thanks.
Mike
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prev parent reply other threads:[~2021-08-19 22:09 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-04 9:41 [dm-devel] use regular gendisk registration in device mapper v2 Christoph Hellwig
2021-08-04 9:41 ` [dm-devel] [PATCH 1/8] block: make the block holder code optional Christoph Hellwig
2021-08-04 9:41 ` [dm-devel] [PATCH 2/8] block: remove the extra kobject reference in bd_link_disk_holder Christoph Hellwig
2021-08-04 9:41 ` [dm-devel] [PATCH 3/8] block: look up holders by bdev Christoph Hellwig
2021-08-04 9:41 ` [dm-devel] [PATCH 4/8] block: support delayed holder registration Christoph Hellwig
[not found] ` <CGME20210810213058eucas1p109323e3c3ecaa76d37d8cf63b6d8ecfd@eucas1p1.samsung.com>
2021-08-10 21:30 ` Marek Szyprowski
2021-08-14 21:13 ` Guenter Roeck
2021-08-15 7:07 ` Christoph Hellwig
2021-08-15 14:27 ` Guenter Roeck
2021-08-16 7:21 ` Christoph Hellwig
2021-08-16 14:17 ` Guenter Roeck
2021-08-20 15:08 ` Christoph Hellwig
2021-08-21 3:17 ` Guenter Roeck
2021-08-18 2:51 ` Guenter Roeck
2021-08-04 9:41 ` [dm-devel] [PATCH 5/8] dm: cleanup cleanup_mapped_device Christoph Hellwig
2021-08-04 9:41 ` [dm-devel] [PATCH 6/8] dm: move setting md->type into dm_setup_md_queue Christoph Hellwig
2021-08-04 9:41 ` [dm-devel] [PATCH 7/8] dm: delay registering the gendisk Christoph Hellwig
2021-08-09 23:31 ` Alasdair G Kergon
2021-08-10 0:17 ` Alasdair G Kergon
2021-08-10 13:12 ` Peter Rajnoha
2021-08-10 15:05 ` Alasdair G Kergon
2022-07-07 3:29 ` Yu Kuai
2022-07-07 5:24 ` Christoph Hellwig
2022-07-07 7:20 ` Yu Kuai
2022-07-15 3:24 ` Yu Kuai
2022-08-01 1:04 ` Yu Kuai
2021-08-04 9:41 ` [dm-devel] [PATCH 8/8] block: remove support for delayed queue registrations Christoph Hellwig
2021-08-09 17:51 ` [dm-devel] use regular gendisk registration in device mapper v2 Jens Axboe
2021-08-10 0:36 ` Alasdair G Kergon
2021-08-10 14:41 ` Alasdair G Kergon
2021-08-19 15:58 ` [dm-devel] holders not working properly, regression [was: Re: use regular gendisk registration in device mapper v2] Mike Snitzer
2021-08-19 18:05 ` Christoph Hellwig
2021-08-19 22:08 ` Mike Snitzer [this message]
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