Implement decoding of fallocate FALLOC_FL_* flags

* xlat/falloc_flags.in: New file.
* configure.ac (AC_CHECK_HEADERS): Add linux/falloc.h.
* fallocate.c [HAVE_LINUX_FALLOC_H]: Include <linux/falloc.h>.
Include xlat/falloc_flags.h.
(sys_fallocate): Decode flags.

configure.ac

@@ -232,6 +232,7 @@ AC_CHECK_HEADERS(m4_normalize([
 	elf.h
 	inttypes.h
 	ioctls.h
+	linux/falloc.h
 	linux/perf_event.h
 	linux/ptrace.h
 	linux/utsname.h

fallocate.c

@@ -1,14 +1,30 @@
 #include "defs.h"
 
+#ifdef HAVE_LINUX_FALLOC_H
+# include <linux/falloc.h>
+#endif
+
+#include "xlat/falloc_flags.h"
+
 int
 sys_fallocate(struct tcb *tcp)
 {
 	if (entering(tcp)) {
 		int argn;
-		printfd(tcp, tcp->u_arg[0]);		/* fd */
-		tprintf(", %#lo, ", tcp->u_arg[1]);	/* mode */
-		argn = printllval(tcp, "%llu, ", 2);	/* offset */
-		printllval(tcp, "%llu", argn);		/* len */
+
+		/* fd */
+		printfd(tcp, tcp->u_arg[0]);
+		tprints(", ");
+
+		/* mode */
+		printflags(falloc_flags, tcp->u_arg[1], "FALLOC_FL_???");
+		tprints(", ");
+
+		/* offset */
+		argn = printllval(tcp, "%llu, ", 2);
+
+		/* len */
+		printllval(tcp, "%llu", argn);
 	}
 	return 0;
 }

xlat/falloc_flags.in

@@ -0,0 +1,5 @@
+FALLOC_FL_KEEP_SIZE
+FALLOC_FL_PUNCH_HOLE
+FALLOC_FL_NO_HIDE_STALE
+FALLOC_FL_COLLAPSE_RANGE
+FALLOC_FL_ZERO_RANGE