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    SubjectRe: [PATCH 0/5] sg_ring for scsi
    From: Rusty Russell <>
    Date: Fri, 21 Dec 2007 10:13:38 +1100

    > But, as demonstrated, there are real benefits of having an explicit header:
    > 1) It removes the chain-end/explicit count ambiguity (see
    > & thread)
    > 2) It allows others to manipulate sg chains, which couldn't be done before
    > (eg. the ATA code which wants to append a padding element).
    > 3) I can now hand you an sg ring for you to fill: sg chains can't do that.
    > In short, sg_ring is generally useful primitive. sg chains are a clever hack
    > for scsi_lib to create, and everyone else to read.

    I do not refute any of this :-)

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