linux-kernel - [BUGFIX][PATCH 0/3] configfs: symlink() fixes

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Message-Id: <1213724243-29183-1-git-send-email-louis.rilling@kerlabs.com>
Date:	Tue, 17 Jun 2008 19:37:20 +0200
From:	Louis Rilling <louis.rilling@...labs.com>
To:	Joel.Becker@...cle.com
Cc:	linux-kernel@...r.kernel.org, ocfs2-devel@....oracle.com,
	Louis Rilling <louis.rilling@...labs.com>
Subject: [BUGFIX][PATCH 0/3] configfs: symlink() fixes

[ applies on top of the previously submitted rename() vs rmdir() deadlock fix ]

Hi,

The following patchset fixes incorrect symlinks to dead items in configfs, which
are forbidden by specification.

The first patch actually prevents such dangling symlinks from being created, but
introduces a weird(?) behavior where a failing symlink() can make a racing
rmdir() fail in the symlink's parent and in the symlink's target as well. The
next patches prevent this behavior using a similar idea as for the mkdir() vs
rmdir() case previously submitted.

Summary:
  configfs: Fix symlink() to a removing item
  configfs: Rename CONFIGFS_USET_IN_MKDIR to CONFIGFS_USET_ATTACHING
  configfs: Fix failing symlink() making rmdir() fail

 fs/configfs/configfs_internal.h |    2 +-
 fs/configfs/dir.c               |   20 ++++++++++----------
 fs/configfs/symlink.c           |   33 +++++++++++++++++++++++++++++----
 3 files changed, 40 insertions(+), 15 deletions(-)

-- 
Dr Louis Rilling			Kerlabs
Skype: louis.rilling			Batiment Germanium
Phone: (+33|0) 6 80 89 08 23		80 avenue des Buttes de Coesmes
http://www.kerlabs.com/			35700 Rennes
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