From: Mike Snitzer <snitzer@kernel.org>
To: Ming Lei <ming.lei@redhat.com>
Cc: Jens Axboe <axboe@kernel.dk>,
linux-block@vger.kernel.org, janpieter.sollie@edpnet.be,
Christoph Hellwig <hch@lst.de>,
dm-devel@lists.linux.dev, Song Liu <song@kernel.org>,
linux-raid@vger.kernel.org
Subject: Re: block: allow device to have both virt_boundary_mask and max segment size
Date: Sun, 7 Apr 2024 10:57:02 -0400 [thread overview]
Message-ID: <ZhK0PvAtXfIfHG4t@redhat.com> (raw)
In-Reply-To: <20240407131931.4055231-1-ming.lei@redhat.com>
On Sun, Apr 07 2024 at 9:19P -0400,
Ming Lei <ming.lei@redhat.com> wrote:
> When one stacking device is over one device with virt_boundary_mask and
> another one with max segment size, the stacking device have both limits
> set. This way is allowed before d690cb8ae14b ("block: add an API to
> atomically update queue limits").
>
> Relax the limit so that we won't break such kind of stacking setting.
>
> Closes: https://bugzilla.kernel.org/show_bug.cgi?id=218687
> Reported-by: janpieter.sollie@edpnet.be
> Fixes: d690cb8ae14b ("block: add an API to atomically update queue limits")
> Link: https://lore.kernel.org/linux-block/ZfGl8HzUpiOxCLm3@fedora/
> Cc: Christoph Hellwig <hch@lst.de>
> Cc: Mike Snitzer <snitzer@kernel.org>
> Cc: dm-devel@lists.linux.dev
> Cc: Song Liu <song@kernel.org>
> Cc: linux-raid@vger.kernel.org
> Signed-off-by: Ming Lei <ming.lei@redhat.com>
> ---
> block/blk-settings.c | 16 ++++++----------
> 1 file changed, 6 insertions(+), 10 deletions(-)
>
> diff --git a/block/blk-settings.c b/block/blk-settings.c
> index cdbaef159c4b..d2731843f2fc 100644
> --- a/block/blk-settings.c
> +++ b/block/blk-settings.c
> @@ -182,17 +182,13 @@ static int blk_validate_limits(struct queue_limits *lim)
> return -EINVAL;
>
> /*
> - * Devices that require a virtual boundary do not support scatter/gather
> - * I/O natively, but instead require a descriptor list entry for each
> - * page (which might not be identical to the Linux PAGE_SIZE). Because
> - * of that they are not limited by our notion of "segment size".
> + * Stacking device may have both virtual boundary and max segment
> + * size limit, so allow this setting now, and long-term the two
> + * might need to move out of stacking limits since we have immutable
> + * bvec and lower layer bio splitting is supposed to handle the two
> + * correctly.
> */
> - if (lim->virt_boundary_mask) {
> - if (WARN_ON_ONCE(lim->max_segment_size &&
> - lim->max_segment_size != UINT_MAX))
> - return -EINVAL;
> - lim->max_segment_size = UINT_MAX;
> - } else {
> + if (!lim->virt_boundary_mask) {
> /*
> * The maximum segment size has an odd historic 64k default that
> * drivers probably should override. Just like the I/O size we
> --
> 2.41.0
>
Reviewed-by: Mike Snitzer <snitzer@kernel.org>
next prev parent reply other threads:[~2024-04-07 14:57 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-07 13:19 [PATCH] block: allow device to have both virt_boundary_mask and max segment size Ming Lei
2024-04-07 14:57 ` Mike Snitzer [this message]
2024-04-07 21:50 ` Jens Axboe
2024-04-08 5:55 ` Christoph Hellwig
2024-04-08 7:36 ` Ming Lei
2024-04-08 8:47 ` Christoph Hellwig
2024-04-08 9:48 ` Ming Lei
2024-04-09 13:57 ` Christoph Hellwig
2024-04-09 15:56 ` Ming Lei
2024-04-08 12:48 ` janpieter.sollie
2024-04-24 10:26 ` Geert Uytterhoeven
2024-04-24 12:41 ` Ming Lei
2024-04-24 13:09 ` Geert Uytterhoeven
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=ZhK0PvAtXfIfHG4t@redhat.com \
--to=snitzer@kernel.org \
--cc=axboe@kernel.dk \
--cc=dm-devel@lists.linux.dev \
--cc=hch@lst.de \
--cc=janpieter.sollie@edpnet.be \
--cc=linux-block@vger.kernel.org \
--cc=linux-raid@vger.kernel.org \
--cc=ming.lei@redhat.com \
--cc=song@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.