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From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Fri, 30 Nov 2012 08:42:56 -0800
Message-ID: <CA+55aFyW2ksiv97u5JwC5OUafD_dN=4+sU+YyDM4=aQfkj9s3A@mail.gmail.com>
Subject: Re: [PATCH v2] Do a proper locking for mmap and block size change
To: Chris Mason <chris.mason@fusionio.com>, Dave Chinner <david@fromorbit.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Chris Mason <clmason@fusionio.com>,
        Mikulas Patocka <mpatocka@redhat.com>,
        Al Viro <viro@zeniv.linux.org.uk>, Jens Axboe <axboe@kernel.dk>,
        Jeff Chua <jeff.chua.linux@gmail.com>,
        Lai Jiangshan <laijs@cn.fujitsu.com>, Jan Kara <jack@suse.cz>,
        lkml <linux-kernel@vger.kernel.org>,
        linux-fsdevel <linux-fsdevel@vger.kernel.org>
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On Fri, Nov 30, 2012 at 6:31 AM, Chris Mason <chris.mason@fusionio.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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