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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