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

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Message-ID: <CA+55aFxaHuxaEezkpmGRi4kFGaQFTv9S89N-hJhxBjVa6ZwnbQ@mail.gmail.com>
Date:	Thu, 29 Nov 2012 11:26:06 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Chris Mason <chris.mason@...ionio.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	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 Thu, Nov 29, 2012 at 11:15 AM, Chris Mason <chris.mason@...ionio.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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