Re: [PATCH 1/3] bdi: Use parent filesystem BDI for inodes notcapable of writeback

[Christoph Hellwig]

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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