From: Tyler Hicks <tyhicks@linux.vnet.ibm.com>
Date: Wed, 12 Aug 2009 06:06:54 +0000 (-0500)
Subject: eCryptfs: Check for O_RDONLY lower inodes when opening lower files
X-Git-Tag: v2.6.32-rc1~47^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ac22ba23b659e34a5961aec8c945608e471b0d5b;p=pandora-kernel.git

eCryptfs: Check for O_RDONLY lower inodes when opening lower files

If the lower inode is read-only, don't attempt to open the lower file
read/write and don't hand off the open request to the privileged
eCryptfs kthread for opening it read/write.  Instead, only try an
unprivileged, read-only open of the file and give up if that fails.
This patch fixes an oops when eCryptfs is mounted on top of a read-only
mount.

Acked-by: Serge Hallyn <serue@us.ibm.com>
Cc: Eric Sandeen <esandeen@redhat.com>
Cc: Dave Kleikamp <shaggy@linux.vnet.ibm.com>
Cc: ecryptfs-devel@lists.launchpad.net
Cc: stable <stable@kernel.org>
Signed-off-by: Tyler Hicks <tyhicks@linux.vnet.ibm.com>
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