On Thu, 2004-11-11 at 16:49, sussman@tigris.org wrote:
> +To test if a path is locked, simply check if the path is a key in the
> +`locks-nodes' table. To see if a certain directory has any locked
> +children below, we ask BerkeleyDB to do a "greater or equal match" on
> +the directory path, and see if any results come back. If they do,
> +then at least one of the directory's children is locked, and thus the
> +directory cannot be deleted without further investigation.
I don't think it's *quite* that simple; you do need to check that the
match you got back is a child of the directory you're testing.
(You may have misinterpreted "greater or equal". What brane meant is
that btree won't give you the closest match; it gives you the closest
match which is greater than or equal to the key you asked for. That
might or might not be a child of the directory you're searching for.)
(Hm, also, I think you need to be careful to search for the directory
with a trailing slash, or you might get a lock entry for
"<dirname><char>" where <char> is lexically less than '/', in which case
you wouldn't be sure whether any descendants are locked.)
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Received on Fri Nov 12 05:26:12 2004