On 10 Sep, Bruce Evans wrote:
> On Tue, 10 Sep 2002, Don Lewis wrote:
>> On 10 Sep, Bruce Evans wrote:
>> > The changes are obviously just cleanups for leaf file systems, but I
>> > wonder why everything wasn't always locked at the top. Could it have
>> > been because locking all the way down is harmful?
>> Judging by how the leaf filesystems were careful to only do the lock if
>> tdvp != vp, I suspect there was the potential for a deadlock if both
>> vnodes were automatically locked at the top.
... or panic "locking against myself" ...
> I think this is because some places are still worrying about using
> link(2) on directories. I think there aren't any significant problems
> when vp is not a directory. Hard linking of directories was permitted
> (and perhaps even supported) until relatively recently:
I suspect that you are right about this. If so, it should be able to
let namei() lock the first vnode since we check its type and bail out if
it is a directory before the second namei() call.
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