linux-kernel - [BUG] commit "namei: d_is_negative() should be checked before ->d

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Message-Id: <C096DBE6-9E22-48BA-B449-375F5AD6E177@redhat.com>
Date:	Wed, 30 Sep 2015 20:53:22 +0800
From:	"Yan, Zheng" <zyan@...hat.com>
To:	Al Viro <viro@...IV.linux.org.uk>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	Ceph Development <ceph-devel@...r.kernel.org>
Subject: [BUG] commit "namei: d_is_negative() should be checked before ->d_seq validation" breaks ceph-fuse

Hi, Al

I found that commit 766c4cbfac "namei: d_is_negative() should be checked before ->d_seq validation”  breaks ceph-fuse. After that commit,  lookup_fast can return -ENOENT before calling d_revalidate(). This breaks remote filesystems which allows creating/deleting files from multiple machines. 

Regards
Yan, Zheng--
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