Re: [PATCH 1/5] Forking ext4 filesystem from ext3 filesystem

[Jeff Garzik]

Andrew Morton wrote:
> On Thu, 10 Aug 2006 16:13:33 -0400
> Jeff Garzik <jeff@xxxxxxxxxx> wrote:
>
> > The sooner we kill buffer heads and use submit_bio(), the better :)
>
> A buffer_head is a caching entity and a bio is an IO container.  They're
> quite separate concepts.

Yeah, sorry, I meant direct pagecache I/O.  I forgot that bio doesn't 
handle caching.


> A buffer_head is the kernel's sole abstraction of a disk block. 
> Filesystems use disk blocks a lot, and they need such an abstraction.

IMO Al Viro work has shown that you can do pagecache I/O without needing 
such a heavyweight system.

	Jeff



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