HEADS UP! More disklabel work on HEAD, be careful

Matthew Dillon dillon at apollo.backplane.com
Sun Jun 17 21:18:32 PDT 2007

    I will be doing a major commit tonight as part of the continuing
    disklabel separation work.  I'm about 90% done separating out
    the standard 32 bit disklabel.  After I finish the separation,
    I will implement a 64 bit disklabel.

    Anyone running HEAD will have to do a full buildworld/installworld
    after tonight's commit or your disklabel program will be out of sync
    with the kernel.  The new disklabel program will detect old kernels,
    but the old disklabel program will not detect new kernels and the
    result will be corrupt labels on disk if disklabel -r is used.

    This work involves a great deal of messing around with the low
    level disklabeling code.  The kernel will no longer snoop-adjust
    raw writes of the disklabel (aka disklabel -r -e/-w sequences),
    will no longer snoop-adjust raw reads of the disklabel (aka
    disklabel -r), and the kernel now manually adjusts the label when
    reading and writing it rather then depending on it being snoop-adjusted
    (which is all the DIOC* ioctls on disk labels).

    In addition, struct disklabel will be no more.  The header file is being
    moved from sys/disklabel.h to sys/disklabel32.h and sys/disklabel.h
    will become a generic abstraction layer.  The original struct disklabel
    will become struct disklabel32, etc.

    All of the disentangling of the disklabel is almost done!

					Matthew Dillon 
					<dillon at backplane.com>

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