From: Ming Lei <ming.lei@redhat.com>
To: Christoph Hellwig <hch@lst.de>
Cc: Jens Axboe <axboe@kernel.dk>,
Jeffle Xu <jefflexu@linux.alibaba.com>,
Damien Le Moal <Damien.LeMoal@wdc.com>,
Keith Busch <kbusch@kernel.org>, Sagi Grimberg <sagi@grimberg.me>,
"Wunderlich, Mark" <mark.wunderlich@intel.com>,
"Vasudevan, Anil" <anil.vasudevan@intel.com>,
linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org,
linux-nvme@lists.infradead.org
Subject: Re: [PATCH 13/16] block: switch polling to be bio based
Date: Mon, 21 Jun 2021 16:35:29 +0800 [thread overview]
Message-ID: <YNBPUUVtxSb6/gv1@T590> (raw)
In-Reply-To: <20210621072005.GA6651@lst.de>
On Mon, Jun 21, 2021 at 09:20:05AM +0200, Christoph Hellwig wrote:
> On Fri, Jun 18, 2021 at 10:27:20PM +0800, Ming Lei wrote:
> > > How? On a block device the caller needs to hold the block device open
> > > to read/write from it. On a file systems the file systems needs to
> > > be mounted, which also holds a bdev reference.
> >
> > + rcu_read_lock();
> > + bio = READ_ONCE(kiocb->private);
> > + if (bio && bio->bi_bdev)
> >
> > The bio may be ended now from another polling job, then the disk is
> > closed & deleted, and released. Then request queue & hctxs are released.
> >
> > + ret = bio_poll(bio, flags);
> >
> > But disk & request queue & hctx can still be referred in above bio_poll().
>
> I don't see how this can happen. A bio stashed into kiocb->private needs
> to belong to the correct device initially. For it to point to the "wrong"
> device it needs to have been completed on the correct one, and then be
> reused for a different device. At the point it is reused that device
> must obviously have been alive, and for it to be freed a RCU grace
> period must have been passed. And that grace period can't have started
> earlier than when iocb_bio_iopoll was called.
gendisk isn't freed after a RCU grace period, so even though bio->bi_bdev
may not be freed really, but the gendisk may have been freed already.
+ rcu_read_lock();
+ bio = READ_ONCE(kiocb->private);
+ if (bio && bio->bi_bdev)
The bio may be ended now from another polling job, and it is freed
and re-allocated & freed, then bio->bi_bdev->bd_disk is freed too, which
will be observed in the following bio_poll().
+ ret = bio_poll(bio, flags);
Thanks,
Ming
next prev parent reply other threads:[~2021-06-21 8:35 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-15 13:10 switch block layer polling to a bio based model v4 Christoph Hellwig
2021-06-15 13:10 ` [PATCH 01/16] direct-io: remove blk_poll support Christoph Hellwig
2021-06-15 13:10 ` [PATCH 02/16] block: don't try to poll multi-bio I/Os in __blkdev_direct_IO Christoph Hellwig
2021-06-15 13:10 ` [PATCH 03/16] iomap: don't try to poll multi-bio I/Os in __iomap_dio_rw Christoph Hellwig
2021-06-15 13:10 ` [PATCH 04/16] blk-mq: factor out a blk_qc_to_hctx helper Christoph Hellwig
2021-06-15 13:10 ` [PATCH 05/16] blk-mq: factor out a "classic" poll helper Christoph Hellwig
2021-06-15 13:10 ` [PATCH 06/16] blk-mq: remove blk_qc_t_to_tag and blk_qc_t_is_internal Christoph Hellwig
2021-06-15 13:10 ` [PATCH 07/16] blk-mq: remove blk_qc_t_valid Christoph Hellwig
2021-06-15 13:10 ` [PATCH 08/16] block: replace the spin argument to blk_iopoll with a flags argument Christoph Hellwig
2021-06-15 13:10 ` [PATCH 09/16] io_uring: don't sleep when polling for I/O Christoph Hellwig
2021-06-15 13:10 ` [PATCH 10/16] block: rename REQ_HIPRI to REQ_POLLED Christoph Hellwig
2021-06-15 13:10 ` [PATCH 11/16] block: use SLAB_TYPESAFE_BY_RCU for the bio slab Christoph Hellwig
2021-06-15 13:10 ` [PATCH 12/16] block: define 'struct bvec_iter' as packed Christoph Hellwig
2021-06-15 13:10 ` [PATCH 13/16] block: switch polling to be bio based Christoph Hellwig
2021-06-16 2:30 ` Ming Lei
2021-06-18 14:01 ` Christoph Hellwig
2021-06-18 14:27 ` Ming Lei
2021-06-21 7:20 ` Christoph Hellwig
2021-06-21 8:35 ` Ming Lei [this message]
2021-06-15 13:10 ` [PATCH 14/16] block: don't allow writing to the poll queue attribute Christoph Hellwig
2021-06-15 13:10 ` [PATCH 15/16] nvme-multipath: set QUEUE_FLAG_NOWAIT Christoph Hellwig
2021-06-15 13:10 ` [PATCH 16/16] nvme-multipath: enable polled I/O Christoph Hellwig
2021-06-15 14:37 ` switch block layer polling to a bio based model v4 Keith Busch
2021-06-15 16:06 ` Christoph Hellwig
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