resize2fs: don't require fsck to print min size

My previous change ended up requiring that the filesystem
be fsck'd after the last mount, even if we are only querying
the minimum size.  This is a bit draconian, and it burned
the Fedora installer, which wants to calculate minimum size
for every filesystem in the box at install time, which in turn
requires a full fsck of every filesystem.

Try this one more time, and separate out the tests to make things
a bit more clear.  If we're only printing the min size, don't
require the fsck, as this is a bit less dangerous/critical.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

resize/main.c

@@ -321,10 +321,30 @@ int main (int argc, char ** argv)
 	}
 	fs->default_bitmap_type = EXT2FS_BMAP64_RBTREE;
 
-	if (!(mount_flags & EXT2_MF_MOUNTED)) {
-		if (!force && ((fs->super->s_lastcheck < fs->super->s_mtime) ||
-			       (fs->super->s_state & EXT2_ERROR_FS) ||
-			       ((fs->super->s_state & EXT2_VALID_FS) == 0))) {
+	/*
+	 * Before acting on an unmounted filesystem, make sure it's ok,
+	 * unless the user is forcing it.
+	 *
+	 * We do ERROR and VALID checks even if we're only printing the
+	 * minimimum size, because traversal of a badly damaged filesystem
+	 * can cause issues as well.  We don't require it to be fscked after
+	 * the last mount time in this case, though, as this is a bit less
+	 * risky.
+	 */
+	if (!force && !(mount_flags & EXT2_MF_MOUNTED)) {
+		int checkit = 0;
+
+		if (fs->super->s_state & EXT2_ERROR_FS)
+			checkit = 1;
+
+		if ((fs->super->s_state & EXT2_VALID_FS) == 0)
+			checkit = 1;
+
+		if ((fs->super->s_lastcheck < fs->super->s_mtime) &&
+		    !print_min_size)
+			checkit = 1;
+
+		if (checkit) {
 			fprintf(stderr,
 				_("Please run 'e2fsck -f %s' first.\n\n"),
 				device_name);