[Unionfs] bug on rhel4

[Stuart Midgley]

OK, I tried building the 2.1.4 against both the 2.6.9-42 lustre and
2.6.9-55 lustre kernels with exactly the same issue.

Stu.


On Wed, 2007-09-19 at 23:46 -0400, Erez Zadok wrote:
> In message <365C0ECB-7F18-4348-BB7E-988632C455EE at dugeo.com>, Stuart Midgley writes:
> > Evening
> > 
> > I have been trying to get unionfs 2.1.3 (and previously 2.1.2)  
> > working on a lustre rhel4 kernel
> > 
> > 	2.6.9-42.0.10.EL_lustre-1.4.10.1smp
> > 
> > The patch to fs/Makefile failed to apply, but was easily applied by  
> > hand.  There was also an issue with compat.h with the redefinition of  
> > atomic_inc_return which I found defined elsewhere in the kernel  
> > source tree.  The simple solution was
> > 
> > #if 0
> > static inline int atomic_inc_return(atomic_t *v)
> > {
> >    atomic_inc(v);
> >    return atomic_read(v);
> > }
> > #endif
> > 
> > So the kernel module now builds perfectly.  However, when I try to  
> > insert the module I get
> > 
> > linux-2.6.9-42.0.10.EL_lustre-1.4.10.1/fs/unionfs # insmod unionfs.ko
> > insmod: error inserting 'unionfs.ko': -1 Unknown symbol in module
> > 
> > and dmesg is showing
> > 
> > unionfs: Unknown symbol fsstack_copy_inode_size
> > 
> > Now, I am really confused.  fsstack_copy_inode_size is in fs/stack.c
> > 
> > void fsstack_copy_inode_size(struct inode *dst, const struct inode *src)
> > {
> >          i_size_write(dst, i_size_read((struct inode *)src));
> >          dst->i_blocks = src->i_blocks;
> > }
> > EXPORT_SYMBOL_GPL(fsstack_copy_inode_size);
> > 
> > and should be in the kernel???  I would have thought the compile  
> > would fail if it wasn't present?  Of course, the kernel I'm running  
> > (binary from a CFS supplied rpm) may not have this symbol...
> > 
> > Ideas?
> > Stu.
> 
> Stu, make sure that fs/stack.c gets compiled, and that it gets linked into
> fs/libfs.a.  Your fs/Makefile should list stack.o in obj-y.  I suspect that
> your hand-patching of fs/Makefile missed the latter.
> 
> And, when in doubt, make clean and recompile your kernel from scratch.
> 
> Erez.
-- 
Dr Stuart Midgley
Manage Production Services
DownUnder GeoSolution
stuartm at dugeo.com