Message type for path related calls.

- Updated system calls VFS_ACCESS, VFS_CHDIR, VFS_CHMOD, VFS_CHROOT,
                        VFS_MKDIR, VFS_OPEN, VFS_RMDIR, VSF_UNLINK

 - Removed M3_STRING and M3_LONG_STRING, which are tied to a specific
   "generic" message, and replaced where needed with M_PATH_STRING_MAX,
   which is tied to the mess_lc_vfs_path message.

Change-Id: If287c74f5ece937b9431e5d95b5b58a3c83ebff1

lib/libc/sys-minix/access.c

@@ -12,7 +12,7 @@ int mode;
   message m;
 
   memset(&m, 0, sizeof(m));
-  m.VFS_PATH_MODE = mode;
+  m.m_lc_vfs_path.mode = mode;
   _loadname(name, &m);
   return(_syscall(VFS_PROC_NR, VFS_ACCESS, &m));
 }

lib/libc/sys-minix/chmod.c

@@ -10,7 +10,7 @@ int chmod(const char *name, mode_t mode)
   message m;
 
   memset(&m, 0, sizeof(m));
-  m.VFS_PATH_MODE = mode;
+  m.m_lc_vfs_path.mode = mode;
   _loadname(name, &m);
   return(_syscall(VFS_PROC_NR, VFS_CHMOD, &m));
 }

lib/libc/sys-minix/loadname.c

@@ -13,7 +13,7 @@ void _loadname(const char *name, message *msgptr)
   register size_t k;
 
   k = strlen(name) + 1;
-  msgptr->VFS_PATH_LEN = k;
-  msgptr->VFS_PATH_NAME = (char *) __UNCONST(name);
-  if (k <= M3_STRING) strcpy(msgptr->VFS_PATH_BUF, name);
+  msgptr->m_lc_vfs_path.len = k;
+  msgptr->m_lc_vfs_path.name = (vir_bytes)name;
+  if (k <= M_PATH_STRING_MAX) strcpy(msgptr->m_lc_vfs_path.buf, name);
 }

lib/libc/sys-minix/mkdir.c

@@ -10,7 +10,7 @@ int mkdir(const char *name, mode_t mode)
   message m;
 
   memset(&m, 0, sizeof(m));
-  m.VFS_PATH_MODE = mode;
+  m.m_lc_vfs_path.mode = mode;
   _loadname(name, &m);
   return(_syscall(VFS_PROC_NR, VFS_MKDIR, &m));
 }

lib/libc/sys-minix/open.c

@@ -25,7 +25,7 @@ int open(const char *name, int flags, ...)
 	call = VFS_CREAT;
   } else {
 	_loadname(name, &m);
-	m.VFS_PATH_FLAGS = flags;
+	m.m_lc_vfs_path.flags = flags;
 	call = VFS_OPEN;
   }
   va_end(argp);

lib/libusb/usb.c

@@ -132,7 +132,7 @@ int usb_init(char *name)
 
 	msg.m_type = USB_RQ_INIT;
 
-	strncpy(msg.USB_RB_INIT_NAME, name, M3_LONG_STRING);
+	strncpy(msg.USB_RB_INIT_NAME, name, M_PATH_STRING_MAX);
 	
 	res = ipc_sendrec(hcd_ep, &msg);