linux-kernel - Re: [PATCH 1/3] bdi: Use parent filesystem BDI for inodes not capable of writeback

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Message-ID: <20100727172731.GA25727@infradead.org>
Date:	Tue, 27 Jul 2010 13:27:31 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Jan Kara <jack@...e.cz>
Cc:	Christoph Hellwig <hch@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 1/3] bdi: Use parent filesystem BDI for inodes not
 capable of writeback

On Tue, Jul 27, 2010 at 07:24:38PM +0200, Jan Kara wrote:
>   Always returning inode->i_sb->s_bdi wouldn't be a right thing IMHO.
> That would file inode for /dev/sda to BDI list of tmpfs mounted on /dev/
> which isn't what you want...

It shouldn't.  Block device nodes are on the bdev filesystems, and
we twist the file->mapping pointer so that all the low-level read/write
code always deals with the bdev fs inode, and not the device node
filesystem.

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