> On Mon, 9 Oct 2006 13:40:41 +0200
> Jan Kara <[email protected]> wrote:
>
> > > What about putting an address_space* into the buffer_head? Transfer the
> > > EIO state into the address_space within, say, __remove_assoc_queue()?
> > Yes, that's of course possible. But it enlarges each buffer head by 4
> > bytes (or 8 on 64-bit arch).
>
> I suspect we could get that back by removing buffer_head.b_bdev. That's
> not a trivial thing to do, but should be feasible.
>
> We can't just do bh->b_page->mapping->host->i_sb->s_bdev because of races
> with trunate, plus the general horror of it all. But I expect that all
> callers of submit_bh() have the blockdev* easily available by other means,
> so adding a `struct block_device*' argument to submit_bh() would get us
> there.
OK. For now I've written and tested the patch with the pointer in
buffer head. Later we can have a look at shrinking buffer_head again...
Honza
--
Jan Kara <[email protected]>
SuSE CR Labs
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