pmt: initial 2.9.1 update

include/e2fsprogs/ext2fs/compiler.h

@@ -0,0 +1,26 @@
+#ifndef _EXT2FS_COMPILER_H
+#define _EXT2FS_COMPILER_H
+
+#include <stddef.h>
+
+#ifdef __GNUC__
+
+#ifndef __GNUC_PREREQ
+#if defined(__GNUC__) && defined(__GNUC_MINOR__)
+#define __GNUC_PREREQ(maj, min) \
+	((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
+#else
+#define __GNUC_PREREQ(maj, min) 0
+#endif
+#endif
+
+#define container_of(ptr, type, member) ({				\
+	__typeof__( ((type *)0)->member ) *__mptr = (ptr);	\
+	(type *)( (char *)__mptr - offsetof(type,member) );})
+#else
+#define container_of(ptr, type, member)				\
+	((type *)((char *)(ptr) - offsetof(type, member)))
+#endif
+
+
+#endif /* _EXT2FS_COMPILER_H */