linux-kernel - [PATCH 0/3] block: loop: switch to VFS ITER

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Message-Id: <1427012095-4095-1-git-send-email-ming.lei@canonical.com>
Date:	Sun, 22 Mar 2015 16:14:51 +0800
From:	Ming Lei <ming.lei@...onical.com>
To:	Jens Axboe <axboe@...com>, linux-kernel@...r.kernel.org
Cc:	Christoph Hellwig <hch@....de>, Al Viro <viro@...iv.linux.org.uk>,
	Maxim Patlasov <mpatlasov@...allels.com>
Subject: [PATCH 0/3] block: loop: switch to VFS ITER_BVEC 

This patchset uses VFS ITER_BVEC for reading/writing
loop backing file, and basically it is a rewriting of
Christoph Hellwig's post in [1].

With this change, loop code becomes much cleaner than before,
and it is also a simplication for reading/writing backing file
inside kernel.

Another benifit is that one extra page copy is avoided for
READ in case of none_transfer. 

This patchset passes xfstest test(ext4, -g auto) over loop block
devices. 

The patch 3/3 depends a bit on Christoph's kiocb split patches
which have been in -next for a while, so tree dependency(not build
depend, just behaviour depend) should be considered if it is to
be merged to 4.0. 

The next step is to add AIO/O_DIRECT support for reading/writing
backing file against this patchset if no one objects, so that double
cache can be avoided.

[1], loop: convert to vfs_bvec_write
http://marc.info/?l=linux-fsdevel&m=142159370107007&w=2

[2], kiocb split patchset
http://marc.info/?t=142238145800004&r=1&w=2

Thanks,
Ming Lei

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