linux-kernel - Re: [PATCH v2 2/7] block: rewrite __bio_copy

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Message-ID: <20150116113145.GA14063@infradead.org>
Date:	Fri, 16 Jan 2015 03:31:45 -0800
From:	Christoph Hellwig <hch@...radead.org>
To:	Dongsu Park <dongsu.park@...fitbricks.com>
Cc:	linux-kernel@...r.kernel.org,
	Christoph Hellwig <hch@...radead.org>,
	Kent Overstreet <kmo@...erainc.com>,
	Jens Axboe <axboe@...nel.dk>, Al Viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCH v2 2/7] block: rewrite __bio_copy_iov()

On Thu, Jan 15, 2015 at 10:18:17AM -0800, Christoph Hellwig wrote:
> This breaks booting a simple KVM VM for me:

Seems like the issue actually is in the patch before this one, but
only shows up with this one applied.

The root cause is that we only copy the iov_iter, but not the
actual iovecs into the bio_map_data.

I have a fixed series, which I'll send out together with various
related cleanups ASAP.
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