From: Sage Weil <sage@newdream.net>
Date: Fri, 29 Oct 2010 19:46:43 +0000 (-0400)
Subject: Btrfs: allow subvol deletion by unprivileged user with -o user_subvol_rm_allowed
X-Git-Tag: v2.6.37-rc1~19^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4260f7c7516f4c209cf0ca34fda99cc9a0847772;p=pandora-kernel.git

Btrfs: allow subvol deletion by unprivileged user with -o user_subvol_rm_allowed

Add a mount option user_subvol_rm_allowed that allows users to delete a
(potentially non-empty!) subvol when they would otherwise we allowed to do
an rmdir(2).  We duplicate the may_delete() checks from the core VFS code
to implement identical security checks (minus the directory size check).
We additionally require that the user has write+exec permission on the
subvol root inode.

Signed-off-by: Sage Weil <sage@newdream.net>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
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