From: Jens Axboe <axboe@kernel.dk>
To: Ming Lei <ming.lei@redhat.com>
Cc: linux-block@vger.kernel.org,
Kent Overstreet <kent.overstreet@gmail.com>,
Dmitry Monakhov <dmonakhov@openvz.org>,
Christoph Hellwig <hch@lst.de>, Hannes Reinecke <hare@suse.com>
Subject: Re: [PATCH] block: remove bio_rewind_iter()
Date: Wed, 5 Sep 2018 15:46:47 -0600 [thread overview]
Message-ID: <8990f9dd-32bd-1bdb-42e6-6d4573d34a03@kernel.dk> (raw)
In-Reply-To: <20180905033335.12666-1-ming.lei@redhat.com>
On 9/4/18 9:33 PM, Ming Lei wrote:
> It is pointed that bio_rewind_iter() is one very bad API[1]:
>
> 1) bio size may not be restored after rewinding
>
> 2) it causes some bogus change, such as 5151842b9d8732 (block: reset
> bi_iter.bi_done after splitting bio)
>
> 3) rewinding really makes things complicated wrt. bio splitting
>
> 4) unnecessary updating of .bi_done in fast path
>
> [1] https://marc.info/?t=153549924200005&r=1&w=2
>
> So this patch takes Kent's suggestion to restore one bio into its original
> state via saving bio iterator(struct bvec_iter) in bio_integrity_prep(),
> given now bio_rewind_iter() is only used by bio integrity code.
Applied, thanks Ming.
--
Jens Axboe
next prev parent reply other threads:[~2018-09-05 21:46 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-05 3:33 [PATCH] block: remove bio_rewind_iter() Ming Lei
2018-09-05 3:52 ` Kent Overstreet
2018-09-05 13:19 ` Christoph Hellwig
2018-09-05 21:46 ` Jens Axboe [this message]
2018-09-15 7:03 ` Christoph Hellwig
2018-09-15 14:41 ` Jens Axboe
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