[XFS] Fix a project quota space accounting leak on rename.

SGI-PV: 951636
SGI-Modid: xfs-linux-melb:xfs-kern:25811a

Signed-off-by: Nathan Scott <nathans@sgi.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/fs/xfs/xfs_rename.c b/fs/xfs/xfs_rename.c
index 81a05cfd77d2..1f148762eb28 100644
--- a/fs/xfs/xfs_rename.c
+++ b/fs/xfs/xfs_rename.c
@@ -316,6 +316,18 @@ xfs_rename(
                 }
         }
 
+        /*
+         * If we are using project inheritance, we only allow renames
+         * into our tree when the project IDs are the same; else the
+         * tree quota mechanism would be circumvented.
+         */
+        if (unlikely((target_dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) &&
+                     (target_dp->i_d.di_projid != src_ip->i_d.di_projid))) {
+                error = XFS_ERROR(EXDEV);
+                xfs_rename_unlock4(inodes, XFS_ILOCK_SHARED);
+                goto rele_return;
+        }
+
         new_parent = (src_dp != target_dp);
         src_is_directory = ((src_ip->i_d.di_mode & S_IFMT) == S_IFDIR);