Require loop autoclear support.

git-svn-id: https://cryptsetup.googlecode.com/svn/trunk@446 36d66b0a-2a48-0410-832c-cd162a569da5

diff --git a/lib/utils_loop.c b/lib/utils_loop.c
index 3a8df47..cbaef4b 100644 (file)
--- a/lib/utils_loop.c
+++ b/lib/utils_loop.c
@@ -83,6 +83,15 @@ int crypt_loop_attach(const char *loop, const char *file,
                (void)ioctl(loop_fd, LOOP_CLR_FD, 0);
                goto out;
        }
+
+       /* Verify that autoclear is really set */
+       memset(&lo64, 0, sizeof(lo64));
+       if (ioctl(loop_fd, LOOP_GET_STATUS64, &lo64) < 0 ||
+           !(lo64.lo_flags & LO_FLAGS_AUTOCLEAR)) {
+               (void)ioctl(loop_fd, LOOP_CLR_FD, 0);
+               goto out;
+       }
+
        r = 0;
 out:
        if (r && loop_fd >= 0)