[Unionfs] Unionfs 2.0 on 2.6.9 kernel

[Erez Zadok]

In message <46B831FC.1080405 at psi.ch>, Beyerle Urs writes:
> Hi,
> 
> I tried unionfs 2.0 on 2.6.9 Redhat Enterprise Kernel
> (2.6.9-55.0.2.EL). Compiling is no problem after commenting out "static
> inline int atomic_inc_return(atomic_t *v)" in fs/unionfs/compat.h. Loading
> the module also works. But when I try to mount unionfs, for example with
> 
> # mount -t unionfs -o  dirs=/dir1=rw:/dir2=ro none /mnt/unionfs
> 
> I get
> mount: Cannot allocate memory
[...]

Urs, try this small fix.  This seems to fix a similar problem for someone
else, but I've not yet released this small fix.  Let me know if it works for
you.

Thanks,
Erez.


diff --git a/fs/unionfs/compat.c b/fs/unionfs/compat.c
index 0135e2e..ea0443e 100644
--- a/fs/unionfs/compat.c
+++ b/fs/unionfs/compat.c
@@ -40,10 +40,6 @@ void *krealloc2(size_t oldsize, void *ptr, size_t newsize, int flags)
   void *newptr;			/* pointer of new buffer */
   int numtocopy;		/* number of bytes copied into new buffer */
 
-  /* check entry conditions */
-  if (oldsize < 1 || newsize < 1)
-	  return NULL;
-
   /*
    * optimization (OPTIONAL): if oldsize is same as newsize, and ptr is not
    * NULL, then there's not need to realloc/malloc.