[PATCH] Disallow 32bit project quota id.

[Arkadiusz Miśkiewicz]

Currently on-disk structure is able to keep only 16bit project quota id,
so disallow 32bit ones. This fixes a problem where part of kernel
structures holding project quota id uses 32bit variable while part
(on-disk) uses 16bit variable which causes project quota member files
to be inaccessible for some operations (like mv/rm).

Signed-off-by: Arkadiusz Miśkiewicz <arekm at maven.pl>
---

Please queue for upcoming 2.6.36 fixes.


 fs/xfs/linux-2.6/xfs_ioctl.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/fs/xfs/linux-2.6/xfs_ioctl.c b/fs/xfs/linux-2.6/xfs_ioctl.c
index 237f5ff..0166226 100644
--- a/fs/xfs/linux-2.6/xfs_ioctl.c
+++ b/fs/xfs/linux-2.6/xfs_ioctl.c
@@ -906,6 +906,10 @@ xfs_ioctl_setattr(
 	if (XFS_FORCED_SHUTDOWN(mp))
 		return XFS_ERROR(EIO);
 
+	/* Disallow 32bit project ids that because on-disk structure is 16bit only */
+	if (fa->fsx_projid > (__uint16_t)-1)
+		return XFS_ERROR(EINVAL);
+
 	/*
 	 * If disk quotas is on, we make sure that the dquots do exist on disk,
 	 * before we start any other transactions. Trying to do this later
-- 
1.7.1.1