rbd: add target object existence flags

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This creates two new flags for object requests to indicate what is
known about the existence of the object to which a request is to be
sent.  The KNOWN flag will be true if the the EXISTS flag is
meaningful.  That is:

    KNOWN   EXISTS
    -----   ------
      0       0     don't know whether the object exists
      0       1     (not used/invalid)
      1       0     object is known to not exist
      1       0     object is known to exist

This will be used in determining how to handle write requests for
data objects for layered rbd images.

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>

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Alex Elder 2013-02-11 12:33:24 -06:00 • committed by Sage Weil

parent 57acbaa7fb

commit 5679c59f60

1 changed files with 37 additions and 0 deletions

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drivers/block/rbd.c

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