xfs: Disallow 32bit project quota id

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

Signed-off-by: Arkadiusz Mi?kiewicz <arekm@maven.pl>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Alex Elder <aelder@sgi.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/fs/xfs/linux-2.6/xfs_ioctl.c b/fs/xfs/linux-2.6/xfs_ioctl.c
index 237f5ffb2ee8..4fec427b83ef 100644
--- a/fs/xfs/linux-2.6/xfs_ioctl.c
+++ b/fs/xfs/linux-2.6/xfs_ioctl.c
@@ -907,6 +907,13 @@ xfs_ioctl_setattr(
                 return XFS_ERROR(EIO);
 
         /*
+         * Disallow 32bit project ids because on-disk structure
+         * is 16bit only.
+         */
+        if ((mask & FSX_PROJID) && (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
          * is messy. We don't care to take a readlock to look at the ids