From: Christoph Hellwig <hch@lst.de>
To: Yu Kuai <yukuai@kernel.org>
Cc: Jens Axboe <axboe@kernel.dk>, Tejun Heo <tj@kernel.org>,
Christoph Hellwig <hch@lst.de>, Keith Busch <kbusch@kernel.org>,
Sagi Grimberg <sagi@grimberg.me>,
Alasdair Kergon <agk@redhat.com>,
Benjamin Marzinski <bmarzins@redhat.com>,
Mike Snitzer <snitzer@kernel.org>,
Mikulas Patocka <mpatocka@redhat.com>,
Dongsheng Yang <dongsheng.yang@linux.dev>,
Zheng Gu <cengku@gmail.com>, Coly Li <colyli@fygo.io>,
Kent Overstreet <kent.overstreet@linux.dev>,
Josef Bacik <josef@toxicpanda.com>, Yu Kuai <yukuai@fygo.io>,
Nilay Shroff <nilay@linux.ibm.com>,
linux-block@vger.kernel.org, cgroups@vger.kernel.org,
linux-nvme@lists.infradead.org, dm-devel@lists.linux.dev,
"linux-bcache@vger.kernel.org Joseph Qi"
<joseph.qi@linux.alibaba.com>
Subject: Re: [RFC PATCH v1 05/17] block: add bio_alloc_atomic() for atomic bio users
Date: Thu, 9 Jul 2026 08:12:07 +0200 [thread overview]
Message-ID: <20260709061207.GC16504@lst.de> (raw)
In-Reply-To: <20260704195124.1375075-6-yukuai@kernel.org>
On Sun, Jul 05, 2026 at 03:51:12AM +0800, Yu Kuai wrote:
> From: Yu Kuai <yukuai@fygo.io>
>
> Add bio_alloc_atomic() for callers that need a GFP_ATOMIC bio from the
> default bio set but cannot safely pass a bdev during allocation. The
> helper returns an unattached bio, leaving callers to set bi_bdev and
> attach blkcg state explicitly before submission.
>
> Use the helper for virtio-pmem flush child bios and OCFS2 heartbeat I/O.
> Both allocate bios from atomic paths and must avoid creating missing blkgs
> once blkg creation is protected by q->blkcg_mutex. virtio-pmem clones the
> parent bio's blkg association; OCFS2 binds heartbeat I/O to the root blkg.
Let's kill off the concept of atomic bio allocations instead.
Joseph already has an outstanding patch for nd_virtio that needs a little
bit more work, and ocfs2 should be easy enough as well.
next prev parent reply other threads:[~2026-07-09 6:12 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-04 19:51 [RFC PATCH v1 00/17] blk-cgroup: protect blkgs with blkcg_mutex Yu Kuai
2026-07-04 19:51 ` [RFC PATCH v1 01/17] nvme-multipath: retarget failedover bios from requeue work Yu Kuai
2026-07-09 6:10 ` Christoph Hellwig
2026-07-04 19:51 ` [RFC PATCH v1 02/17] dm thin: avoid bio_set_dev under pool lock Yu Kuai
2026-07-04 19:51 ` [RFC PATCH v1 03/17] dm snapshot: avoid bio_set_dev in locked map paths Yu Kuai
2026-07-04 19:51 ` [RFC PATCH v1 04/17] blk-throttle: protect throttle state with td lock Yu Kuai
2026-07-04 19:51 ` [RFC PATCH v1 05/17] block: add bio_alloc_atomic() for atomic bio users Yu Kuai
2026-07-09 6:12 ` Christoph Hellwig [this message]
2026-07-09 9:49 ` yu kuai
2026-07-04 19:51 ` [RFC PATCH v1 06/17] blk-cgroup: support non-blocking bio association Yu Kuai
2026-07-09 6:13 ` Christoph Hellwig
2026-07-04 19:51 ` [RFC PATCH v1 07/17] block: support non-blocking bio allocation with a bdev Yu Kuai
2026-07-09 6:15 ` Christoph Hellwig
2026-07-09 10:02 ` yu kuai
2026-07-04 19:51 ` [RFC PATCH v1 08/17] bcache: avoid sleeping blkg association from locked paths Yu Kuai
2026-07-04 19:51 ` [RFC PATCH v1 09/17] dm bufio: avoid blkg association from GFP_NOWAIT bio init Yu Kuai
2026-07-04 19:51 ` [RFC PATCH v1 10/17] dm pcache: handle non-blocking bio clone init failure Yu Kuai
2026-07-04 19:51 ` [RFC PATCH v1 11/17] block: avoid scheduling from non-blocking helper allocations Yu Kuai
2026-07-04 19:51 ` [RFC PATCH v1 12/17] dm: avoid sleeping blkg association from NOWAIT remaps Yu Kuai
2026-07-04 19:51 ` [RFC PATCH v1 13/17] bfq: avoid blkg lookup from locked cgroup update Yu Kuai
2026-07-04 19:51 ` [RFC PATCH v1 14/17] blk-cgroup: protect blkgs with blkcg_mutex Yu Kuai
2026-07-04 19:51 ` [RFC PATCH v1 15/17] blk-cgroup: remove blkg radix tree preloading Yu Kuai
2026-07-09 6:18 ` Christoph Hellwig
2026-07-09 9:57 ` yu kuai
2026-07-04 19:51 ` [RFC PATCH v1 16/17] blk-cgroup: allocate blkgs in blkg_create Yu Kuai
2026-07-04 19:51 ` [RFC PATCH v1 17/17] blk-cgroup: share blkg creation between lookup and config prep Yu Kuai
2026-07-09 6:09 ` [RFC PATCH v1 00/17] blk-cgroup: protect blkgs with blkcg_mutex Christoph Hellwig
2026-07-09 10:08 ` yu kuai
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