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From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Thu, 29 Nov 2012 11:26:06 -0800
Message-ID: <CA+55aFxaHuxaEezkpmGRi4kFGaQFTv9S89N-hJhxBjVa6ZwnbQ@mail.gmail.com>
Subject: Re: [PATCH v2] Do a proper locking for mmap and block size change
To: Chris Mason <chris.mason@fusionio.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        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 Thu, Nov 29, 2012 at 11:15 AM, Chris Mason <chris.mason@fusionio.com> wrote:
>
> The fs/buffer.c part makes sense during a quick read.  But
> fs/direct-io.c plays with i_blkbits too.  The semaphore was fixing real
> bugs there.

Ugh. I _hate_ direct-IO. What a mess. And yeah, it seems to be
incestuously playing games that should be in fs/buffer.c. I thought it
was doing the sane thing with the page cache.

(I now realize that Mikulas was talking about this mess, while I
thought he was talking about the AIO code which is largely sane).

                    Linus
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