GIT: unionfs2-2.6.27.y: Unionfs: cache-coherency fixes

[Erez Zadok]

commit ee8305b364e6f3e32bcfb52d60ee0188fa380844
Author: Erez_Zadok <ezk at cs.sunysb.edu>
Date:   Wed Sep 19 23:52:18 2007 -0400

    Unionfs: cache-coherency fixes
    
    Do not update mtime if there is no upper branch for the inode.  This
    prevents from calling unionfs_lower_inode_idx() with a negative index, which
    triggers a bug.
    
    Signed-off-by: Olivier Blin <blino at mandriva.com>
    Acked-by: Erez Zadok <ezk at cs.sunysb.edu>

diff --git a/fs/unionfs/fanout.h b/fs/unionfs/fanout.h
index afeb9f6..51aa0de 100644
--- a/fs/unionfs/fanout.h
+++ b/fs/unionfs/fanout.h
@@ -308,7 +308,7 @@ static inline void unionfs_copy_attr_times(struct inode *upper)
 	int bindex;
 	struct inode *lower;
 
-	if (!upper)
+	if (!upper || ibstart(upper) < 0)
 		return;
 	for (bindex=ibstart(upper); bindex <= ibend(upper); bindex++) {
 		lower = unionfs_lower_inode_idx(upper, bindex);