xfs: use generic get_unaligned_beXX helpers

Switch the shortform directory code over to use the generic
get_unaligned_beXX helpers instead of reinventing them.  As a result
kill off xfs_arch.h and move the setting of XFS_NATIVE_HOST into
xfs_linux.h.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Alex Elder <aelder@sgi.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>

fs/xfs/linux-2.6/xfs_linux.h

@@ -33,7 +33,6 @@
 #endif
 
 #include <xfs_types.h>
-#include <xfs_arch.h>
 
 #include <kmem.h>
 #include <mrlock.h>
@@ -88,6 +87,12 @@
 #include <xfs_buf.h>
 #include <xfs_message.h>
 
+#ifdef __BIG_ENDIAN
+#define XFS_NATIVE_HOST 1
+#else
+#undef XFS_NATIVE_HOST
+#endif
+
 /*
  * Feature macros (disable/enable)
  */

fs/xfs/xfs_dir2_sf.c

@@ -59,21 +59,22 @@ static void xfs_dir2_sf_toino4(xfs_da_args_t *args);
 static void xfs_dir2_sf_toino8(xfs_da_args_t *args);
 #endif /* XFS_BIG_INUMS */
 
-
 /*
  * Inode numbers in short-form directories can come in two versions,
  * either 4 bytes or 8 bytes wide.  These helpers deal with the
  * two forms transparently by looking at the headers i8count field.
+ *
+ * For 64-bit inode number the most significant byte must be zero.
  */
 static xfs_ino_t
 xfs_dir2_sf_get_ino(
 	struct xfs_dir2_sf_hdr	*hdr,
 	xfs_dir2_inou_t		*from)
 {
 	if (hdr->i8count)
-		return XFS_GET_DIR_INO8(from->i8);
+		return get_unaligned_be64(&from->i8.i) & 0x00ffffffffffffffULL;
 	else
-		return XFS_GET_DIR_INO4(from->i4);
+		return get_unaligned_be32(&from->i4.i);
 }
 
 static void
@@ -82,10 +83,12 @@ xfs_dir2_sf_put_ino(
 	xfs_dir2_inou_t		*to,
 	xfs_ino_t		ino)
 {
+	ASSERT((ino & 0xff00000000000000ULL) == 0);
+
 	if (hdr->i8count)
-		XFS_PUT_DIR_INO8(ino, to->i8);
+		put_unaligned_be64(ino, &to->i8.i);
 	else
-		XFS_PUT_DIR_INO4(ino, to->i4);
+		put_unaligned_be32(ino, &to->i4.i);
 }
 
 xfs_ino_t

fs/xfs/xfs_dir2_sf.h

@@ -95,13 +95,13 @@ static inline int xfs_dir2_sf_hdr_size(int i8count)
 static inline xfs_dir2_data_aoff_t
 xfs_dir2_sf_get_offset(xfs_dir2_sf_entry_t *sfep)
 {
-	return INT_GET_UNALIGNED_16_BE(&(sfep)->offset.i);
+	return get_unaligned_be16(&sfep->offset.i);
 }
 
 static inline void
 xfs_dir2_sf_put_offset(xfs_dir2_sf_entry_t *sfep, xfs_dir2_data_aoff_t off)
 {
-	INT_SET_UNALIGNED_16_BE(&(sfep)->offset.i, off);
+	put_unaligned_be16(off, &sfep->offset.i);
 }
 
 static inline int