New API: resize2fs-M to resize ext2/3/4 to minimum size.

daemon/ext2.c

@@ -265,6 +265,27 @@ do_resize2fs_size (const char *device, int64_t size)
   return 0;
 }
 
+int
+do_resize2fs_M (const char *device)
+{
+  char *err;
+  int r;
+
+  char prog[] = "resize2fs";
+  if (e2prog (prog) == -1)
+    return -1;
+
+  r = command (NULL, &err, prog, "-M" , device, NULL);
+  if (r == -1) {
+    reply_with_error ("%s", err);
+    free (err);
+    return -1;
+  }
+
+  free (err);
+  return 0;
+}
+
 int
 do_e2fsck_f (const char *device)
 {

generator/generator_actions.ml

@@ -5675,6 +5675,19 @@ is no extended attribute named C<name>, this returns an error.
 
 See also: C<guestfs_lgetxattrs>, C<guestfs_getxattr>, L<attr(5)>.");
 
+  ("resize2fs_M", (RErr, [Device "device"], []), 281, [],
+   [],
+   "resize an ext2, ext3 or ext4 filesystem to the minimum size",
+   "\
+This command is the same as C<guestfs_resize2fs>, but the filesystem
+is resized to its minimum size.  This works like the C<-M> option
+to the C<resize2fs> command.
+
+To get the resulting size of the filesystem you should call
+C<guestfs_tune2fs_l> and read the C<Block size> and C<Block count>
+values.  These two numbers, multiplied together, give the
+resulting size of the minimal filesystem in bytes.");
+
 ]
 
 let all_functions = non_daemon_functions @ daemon_functions

src/MAX_PROC_NR

@@ -1 +1 @@
-280
+281