Re: VFS regression: commit aba809cf0944 breaks MNT_SHRINKABLE automounted partitions

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On Fri, Aug 29, 2014 at 05:47:58PM -0400, Trond Myklebust wrote:

> Note that the issue happens with NFSv4 or NFSv4.1 (not NFSv3).

That's what I'd been using for testing.

> Note that on my system, if I call 'umount' a second time after getting
> the 'device is busy' error, then it succeeds. It looks as if the first
> call to 'umount /mnt' causes the directory /mnt/export to clear,
> causing the second 'umount /mnt' to succeeed (unless I try to access
> /mnt/export again):

Now, that smells like a different bug - see if commit ab8f2c from -next
helps with that one.

Anyway, I think I see what's going on; moreover, I have a kinda-sorta
solution for the current tree, but it's not something that'll be fun
to backport and I'd prefer to look for alternative solutions before going
for that one.  Hopefully I'll have something postable by tomorrow morning...
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