On Fri, 17 Aug 2007 11:19:21 EDT, Phillip Susi said: > Kyle Moffett wrote: >> Problem 1: "updating cached acls of descendent objects": How do you >> find out what a 'descendent object' is? Answer: You can't without >> recursing through the entire in-memory dentry tree.
I suspect Kyle is not quite correct - it's probably the case that you don't have to consider just the in-memory dentries, but *all* the descendent objects in the entire file system. If you have a clever proof that on-disk can't *possibly* be affected, feel free to present it. (Does anybody know offhand what means 'chacl -r' uses to avoid race conditions with directories being moved in/out from under it, or does it just say "we'll make a best stab at it"?) > Yes, it would take some cpu time, and yes, it would have to use a lock > to protect the acl which would also lock out moves. Is that such a high > cost? Changing acls and moving whole directory trees around is not THAT > common of an operation... if it takes a wee bit more cpu time, I doubt > anyone will complain. It will become even *more* of a "not that common" if the lock will block moves and ACL changes *across the filesystem* for potentially *minutes* at a time.
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