In reference to: http://oss.sgi.com/archives/xfs/2012-05/msg00046.html
$ grep -r cleancache fs/xfs
on the 3.9 kernel source suggests that no patch was submitted to enable
cleancache for the XFS filesystem. Since it was suggested that this
could be a one liner I've had a go and my first effort is inline below.
While this seems to compile OK I have no experience in filesystems so I
would appreciate it if anyone can point out that it is obviously wrong
and likely to eat my data before I try booting the kernel.
If it seems a reasonable attempt what would be the best way to check
that it isn't doing nasty things?
--- xfs_super.c 2013-04-29 10:28:22.000000000 +0100
+++ xfs_super.cleancache.c 2013-05-01 13:22:44.367763564 +0100
@@ -61,6 +61,7 @@
static const struct super_operations xfs_super_operations;
static kmem_zone_t *xfs_ioend_zone;
@@ -1489,6 +1490,8 @@