A testing/debugging tool to wipe partitions

This is basically a command line tool version of the wipe_block_device()
function in libext4_utils.  Useful for testing and/or debugging the
BLKSECDISCARD and BLKDISCARD ioctls.

Change-Id: I733f0f7daa673624ddbaac055d82b64d741acd70

1 files changed, 131 insertions, 0 deletions

diff --git a/tests/storage/wipe_blkdev.c b/tests/storage/wipe_blkdev.c
new file mode 100644
index 00000000..43b630b9
--- /dev/null
+++ b/tests/storage/wipe_blkdev.c
@@ -0,0 +1,131 @@
+/*
+ * Copyright (C) 2011, 2012 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/ioctl.h>
+#include <linux/fs.h>
+#include <errno.h>
+
+typedef unsigned long long u64;
+
+#ifndef BLKDISCARD
+#define BLKDISCARD _IO(0x12,119)
+#endif
+
+#ifndef BLKSECDISCARD
+#define BLKSECDISCARD _IO(0x12,125)
+#endif
+
+static u64 get_block_device_size(int fd)
+{
+        u64 size = 0;
+        int ret;
+
+        ret = ioctl(fd, BLKGETSIZE64, &size);
+
+        if (ret)
+                return 0;
+
+        return size;
+}
+
+static int wipe_block_device(int fd, u64 len, int secure)
+{
+    u64 range[2];
+    int ret;
+    int req;
+
+    range[0] = 0;
+    range[1] = len;
+    if (secure) {
+       req = BLKSECDISCARD;
+    } else {
+       req = BLKDISCARD;
+    }
+
+    ret = ioctl(fd, req, &range);
+    if (ret < 0) {
+        fprintf(stderr, "%s discard failed, errno = %d\n",
+                secure ? "Secure" : "Nonsecure", errno);
+    }
+
+    return ret;
+}
+
+static void usage(void)
+{
+    fprintf(stderr, "Usage: wipe_blkdev [-s] <partition>\n");
+    exit(1);
+}
+
+int main(int argc, char *argv[])
+{
+    int secure = 0;
+    char *devname;
+    int fd;
+    u64 len;
+    struct stat statbuf;
+    int ret;
+
+    if ((argc != 2) && (argc != 3)) {
+        usage();
+    }
+
+    if (argc == 3) {
+        if (!strcmp(argv[1], "-s")) {
+            secure = 1;
+            devname = argv[2];
+        } else {
+            usage();
+        }
+    } else {
+        devname = argv[1];
+    }
+
+    fd = open(devname, O_RDWR);
+    if (fd < 0) {
+        fprintf(stderr, "Cannot open device %s\n", devname);
+        exit(1);
+    }
+
+    if (fstat(fd, &statbuf) < 0) {
+        fprintf(stderr, "Cannot stat %s\n", devname);
+        exit(1);
+    }
+
+    if (!S_ISBLK(statbuf.st_mode)) {
+        fprintf(stderr, "%s is not a block device\n", devname);
+        exit(1);
+    }
+
+    len = get_block_device_size(fd);
+
+    if (! len) {
+        fprintf(stderr, "Cannot get size of block device %s\n", devname);
+        exit(1);
+    }
+
+    ret = wipe_block_device(fd, len, secure);
+
+    close(fd);
+
+    return ret;
+}