The off64_t type is usually only conditionally exposed under the
feature test macro _LARGEFILE64_SOURCE (also defined by _GNU_SOURCE).
To make the public xfs headers more standalone therefore off64_t should
be avoided.
Enable transparent large file support via configure so that the
standard off_t is the same as off64_t. Make compilation of linux
programs using libxfs but without large file support fail. Now off64_t
can safely be replaced by off_t in linux.h.
Signed-off-by: Felix Janda <felix.janda@xxxxxxxxx>
---
configure.ac | 2 ++
include/linux.h | 7 ++++++-
2 files changed, 8 insertions(+), 1 deletion(-)
diff --git a/configure.ac b/configure.ac
index a4a6cfa..2ea3e50 100644
--- a/configure.ac
+++ b/configure.ac
@@ -107,6 +107,8 @@ AC_PACKAGE_UTILITIES(xfsprogs)
AC_MULTILIB($enable_lib64)
AC_RT($enable_librt)
+AC_SYS_LARGEFILE
+
AC_PACKAGE_NEED_UUID_H
AC_PACKAGE_NEED_UUIDCOMPARE
diff --git a/include/linux.h b/include/linux.h
index cc0f70c..b94de81 100644
--- a/include/linux.h
+++ b/include/linux.h
@@ -142,7 +142,12 @@ platform_discard_blocks(int fd, uint64_t start, uint64_t len)
#define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */
#define EFSBADCRC EBADMSG /* Bad CRC detected */
-typedef off64_t xfs_off_t;
+/* Make compilation fail when off_t has 32 bits */
+struct __xfs_assert_64bit_off_t {
+ int assert_64bit_off_t[sizeof(off_t)-8];
+};
+
+typedef off_t xfs_off_t;
typedef __uint64_t xfs_ino_t;
typedef __uint32_t xfs_dev_t;
typedef __int64_t xfs_daddr_t;
--
2.7.3
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