zfs_rename: another zfs+vfs deadlock

[Konstantin Belousov]

On Wed, Jul 17, 2013 at 02:03:25PM +0300, Andriy Gapon wrote:
> A scenario to reproduce this bug could be like this.
> mkdir a
> mkdir a/b
> mv some-file a/b/ (in parallel with) stat a/b
> Of course it would have to be repeated many times to hit the right timing
> window.  Also, namecache could interfere with this scenario, but I am not sure.
> 

There is no questions or proposals on how to approach the fix, JFYI mail ?

I recommend you to look at the ufs_checkpath() and its use in the
ufs_rename().
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