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From: Yihao Wu <wuyihao@linux.alibaba.com>
To: linux-nfs@vger.kernel.org
Cc: jlayton@redhat.com
Subject: Why doesn't NFSv3 implement LOOKUPP?
Date: Wed, 13 Feb 2019 16:41:12 +0800	[thread overview]
Message-ID: <3dc67361-9c2f-d183-09e5-0a4d5c48d0f7@linux.alibaba.com> (raw)

Hi all,

When looking into "Failures: generic/467" given by xfstests, I found that NFSv3
didn't implement LOOKUPP. I know that this might be by design. But LOOKUPP was
meant to replace ".." in NFSv3, right?

xfstests's generic/467 test case performs the following sequence of operations.

name_to_handle -> drop_caches -> open_by_handle

Dentry becomes disconnected due to drop_caches. NFSv3 doesn't support LOOKUPP.
So when it performs open_by_handle to an directory, this test case fails.

I did some small experiment by implementing LOOKUPP for NFSv3. The way I tried
is to merely pass ".." to nfs3_proc_lookup. And it seems to work. At least it's
a workaround for xfstests.

I'm curious whether this sort of simulation of LOOKUPP will work or make sense.

Thanks,
Yihao Wu

             reply	other threads:[~2019-02-13  8:41 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-02-13  8:41 Yihao Wu [this message]
2019-02-13 11:50 ` Why doesn't NFSv3 implement LOOKUPP? Jeff Layton
2019-02-15  5:14   ` Yihao Wu
2019-02-15  9:49     ` Jeff Layton
2019-02-15 13:24     ` Trond Myklebust

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