linux-kernel - Re: [PATCH 0/4] block: fix bio_will

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Date:	Mon, 15 Feb 2016 10:33:29 +0200
From:	Sagi Grimberg <sagig@....mellanox.co.il>
To:	Ming Lei <ming.lei@...onical.com>, Jens Axboe <axboe@...nel.dk>,
	linux-kernel@...r.kernel.org
Cc:	linux-block@...r.kernel.org, Christoph Hellwig <hch@...radead.org>
Subject: Re: [PATCH 0/4] block: fix bio_will_gap()


> Hi,
>
> After bio splitting is introduced, the splitted bio can be fast-cloned,
> which is correct because biovecs has become immutable since v3.13.
>
> Unfortunately bio_will_gap() isn't ready for this kind of change,
> because it figures out the last bvec via 'bi_io_vec[prev->bi_vcnt - 1]'
> directly.
>
> It is observed that lots of BIOs are merges even the virt boundary
> limit is violated, and the issue is reported from Sagi Grimberg.

This set makes the virt_boundary violation go away...