linux-kernel - Re: [PATCH v2] Do a proper locking for mmap and block size change

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Date:	Fri, 30 Nov 2012 08:42:56 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Chris Mason <chris.mason@...ionio.com>,
	Dave Chinner <david@...morbit.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Chris Mason <clmason@...ionio.com>,
	Mikulas Patocka <mpatocka@...hat.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	Jens Axboe <axboe@...nel.dk>,
	Jeff Chua <jeff.chua.linux@...il.com>,
	Lai Jiangshan <laijs@...fujitsu.com>, Jan Kara <jack@...e.cz>,
	lkml <linux-kernel@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH v2] Do a proper locking for mmap and block size change

On Fri, Nov 30, 2012 at 6:31 AM, Chris Mason <chris.mason@...ionio.com> wrote:
> On Thu, Nov 29, 2012 at 07:49:10PM -0700, Dave Chinner wrote:
>>
>> Same with mpage_readpages(), so it's not just direct IO that has
>> this problem....
>
> I guess the good news is that block devices don't have readpages.  The
> bad news would be that we can't put readpages in without much bigger
> changes.

Well, the new block-dev branch no longer cares. It basically says "ok,
we use inode->i_blkbits, but for raw device accesses we know it's
unstable, so we'll just not use it".

So both mpage_readpages and direct-IO should be happy. And it actually
removed redundant code, so it's all good.

                 Linus
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