[PATCHv2 xfsprogs 13/14] xfs.h: require transparent LFS

[Felix Janda]

Since our interfaces depend on the consistent use of a 64bit offset
type, force downstreams to use transparent LFS (_FILE_OFFSET_BITS=64),
so that it becomes impossible for them to use 32bit interfaces.

Signed-off-by: Felix Janda <felix.janda at posteo.de>
---
Christoph Hellwig wrote:
> > +extern int xfs_assert_largefile[sizeof(off_t)-8];
> 
> Please add a comment on why we have this declaration, otherwise this
> looks fine to me:
> 
> Reviewed-by: Christoph Hellwig <hch at lst.de>

A simple comment is added.
---
 include/xfs.h | 5 ++
 1 file changed, 5 insertions(+)

diff --git a/include/xfs.h b/include/xfs.h
index 7bed957..37c95fe 100644
--- a/include/xfs.h
+++ b/include/xfs.h
@@ -47,6 +47,11 @@
 # error unknown platform... have fun porting!
 #endif
 
+/*
+ * make sure that any user of the xfs headers has a 64bit off_t type
+ */
+extern int xfs_assert_largefile[sizeof(off_t)-8];
+
 /*
  * sparse kernel source annotations
  */
-- 
2.7.3