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Date: Mon, 3 Feb 2014 16:24:33 +0000
From: Al Viro <viro@ZenIV.linux.org.uk>
Subject: Re: [RFC] unifying write variants for filesystems
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To: Christoph Hellwig <hch@infradead.org>
Cc: Jens Axboe <axboe@kernel.dk>, Dave Kleikamp <shaggy@kernel.org>, Sage Weil <sage@inktank.com>, Mark Fasheh <mfasheh@suse.com>, xfs@oss.sgi.com, Steve French <sfrench@samba.org>, Joel Becker <jlbec@evilplan.org>, linux-fsdevel <linux-fsdevel@vger.kernel.org>, Linus Torvalds <torvalds@linux-foundation.org>, Anton Altaparmakov <anton@tuxera.com>

On Mon, Feb 03, 2014 at 07:12:42AM -0800, Christoph Hellwig wrote:
> > we end up calling it is allowed to try and steal pages).   Possibly more
> > variants on the read side of things...  FWIW, I'm not sure that bio_vec
> > makes a lot of sense here.
> 
> bio_vec just is one of the many page+offset+len containers we have, I
> guess Dave took it because loop uses it.  We could either invent a new
> one here or finally have a common one for the different uses all over
> the kernel.

*blink*

Good luck unifying all such uses.  That would have to include the things
needed by pipe_buffer, DMA-related bits for scatterlist, etc.  I don't
believe that it's feasible, or would've been a good idea in the first
place...

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