Messages in this thread | | | Date | Thu, 10 Aug 2006 17:00:28 -0400 | From | Jeff Garzik <> | Subject | Re: [PATCH 1/5] Forking ext4 filesystem from ext3 filesystem |
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Andrew Morton wrote: > On Thu, 10 Aug 2006 16:13:33 -0400 > Jeff Garzik <jeff@garzik.org> 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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