Btrfs devel - Apr 2011 - completely revised ioctl for notification of when all space from a snapshot delete is freed and similar

I have started rewriting the ioctl#21 patch using a less hacky
architecture, including defining a new kind of structure that
explicitly organizes information common to delayed/deferred systems,
(the list of work pieces, and an atomic for counting active worker
threads) and replacing the lists of work pieces, in ioctl#21-tracked
deferred systems, with this structure instead.

I started march 25, but haven''t had time to work on this since then
and would like to hand it off.

I have the structure as described above in place, and some macros for
use within the ioctl body written; the next thing is to try compiling
and replace all references to the replaced list heads with the new
syntax.

Any takers?


David Nicol
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