losetup: rewrite -f

Signed-off-by: Karel Zak <kzak@redhat.com>

diff --git a/sys-utils/losetup.c b/sys-utils/losetup.c
index d4a97a3903e2ab3d562ad975369895dd64f53573..0d8bd858d0fdc4058d190aa2c456f70ccfc6fcd8 100644 (file)
--- a/sys-utils/losetup.c
+++ b/sys-utils/losetup.c
@@ -1038,6 +1038,7 @@ int main(int argc, char **argv)
                        encryption = optarg;
                        break;
                case 'f':
+                       act = A_FIND_FREE;
                        find = 1;
                        break;
                case 'h':
@@ -1087,6 +1088,12 @@ int main(int argc, char **argv)
        case A_DELETE_ALL:
                res = delete_all_loops(&lc);
                break;
+       case A_FIND_FREE:
+               if (loopcxt_find_unused(&lc))
+                       warn(_("find unused loop device failed"));
+               else
+                       printf("%s\n", loopcxt_get_device(&lc));
+               break;
        case A_SHOW:
                res = show_all_loops(&lc, file, offset, flags);
                break;