[LPIA Hardy LUM, netbook-lpia branch] unionfs: enable delete=all unionfs mount option

[Andy Whitcroft]

On Wed, Oct 07, 2009 at 07:04:50PM +0100, Colin Ian King wrote:
> For: Hardy Lum, netbook-lpia branch 
> 
> LP#445673
> 
> https://bugs.launchpad.net/ubuntu/+bug/445673
> 
> unionfs does not have the delete=all mount option compiled
> in. Enable this by adding -DUNIONFS_DELETE_ALL to CFLAGS.
> 
> Without the delete=all option configured one cannot mount
> a unionfs without having to fallback on using whiteouts which
> can consume a considerable amount of inodes to mark deleted
> files. This can cause problems on unionfs systems with limited
> inode reservations where storage is very limited.
> 

Sounds reasonable and the patch looks pretty safe.

Acked-by: Andy Whitcroft <apw at canonical.com>

-apw