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