Hi,
I wrote a patch to extend the kernel unit number allocator for
allocating specific unit numbers. The patch adds a new function
alloc_unr_specific() which returns the requested unit number if it is
free and -1 if the number is already allocated or out of the range.
Unlike alloc_unr(), alloc_unr_specific() may allocate memory and thus
sleep.
The patch is here:
http://people.freebsd.org/~jh/patches/alloc_unr_specific.diff
I think that this functionality has been requested by some people.
Reviews/comments?
As an example here is md(4) converted to use
alloc_unr() / alloc_unr_specific():
http://people.freebsd.org/~jh/patches/md-alloc_unr.diff
--
Jaakko
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