Add support for decoding of DM_* ioctl commands

* dm.c: New file.
* xlat/dm_flags.in: Likewise.
* Makefile.am (strace_SOURCES): Add dm.c.
* configure.ac (AC_CHECK_HEADERS): Add linux/dm-ioctl.h.
* defs.h (dm_ioctl): New prototype.
* ioctl.c (ioctl_decode) [HAVE_LINUX_DM_IOCTL_H]: Call dm_ioctl
for 0xfd ioctl type.
* tests/ioctl_dm.c: New file.
* tests/ioctl_dm-v.c: Likewise.
* tests/ioctl_dm.test: New test.
* tests/ioctl_dm-v.test: Likewise.
* tests/.gitignore: Add ioctl_dm and ioctl_dm-v.
* tests/Makefile.am (check_PROGRAMS): Likewise.
(DECODER_TESTS): Add ioctl_dm.test and ioctl_dm-v.test.

Co-authored-by: Eugene Syromyatnikov <evgsyr@gmail.com>

Makefile.am

@@ -97,6 +97,7 @@ strace_SOURCES =	\
 	desc.c		\
 	dirent.c	\
 	dirent64.c	\
+	dm.c		\
 	empty.h		\
 	epoll.c		\
 	evdev.c		\

configure.ac

@@ -378,6 +378,7 @@ AC_CHECK_HEADERS(m4_normalize([
 	elf.h
 	inttypes.h
 	linux/bsg.h
+	linux/dm-ioctl.h
 	linux/dqblk_xfs.h
 	linux/falloc.h
 	linux/fiemap.h

defs.h

@@ -648,6 +648,7 @@ extern void print_struct_statfs64(struct tcb *tcp, long, unsigned long);
 
 extern void print_ifindex(unsigned int);
 
+extern int dm_ioctl(struct tcb *, const unsigned int, long);
 extern int file_ioctl(struct tcb *, const unsigned int, long);
 extern int fs_x_ioctl(struct tcb *, const unsigned int, long);
 extern int loop_ioctl(struct tcb *, const unsigned int, long);