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-rw-r--r--btrfslabel.c121
1 files changed, 121 insertions, 0 deletions
diff --git a/btrfslabel.c b/btrfslabel.c
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index 00000000..c9f46844
--- /dev/null
+++ b/btrfslabel.c
@@ -0,0 +1,121 @@
+/*
+ * Copyright (C) 2008 Morey Roof. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License v2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ */
+
+#define _GNU_SOURCE
+
+#ifndef __CHECKER__
+#include <sys/ioctl.h>
+#include <sys/mount.h>
+#include "ioctl.h"
+#endif /* __CHECKER__ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <dirent.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <linux/fs.h>
+#include <linux/limits.h>
+#include <ctype.h>
+#include "kerncompat.h"
+#include "ctree.h"
+#include "utils.h"
+#include "version.h"
+#include "disk-io.h"
+#include "transaction.h"
+
+#define MOUNTED 1
+#define UNMOUNTED 2
+#define GET_LABEL 3
+#define SET_LABEL 4
+
+static void change_label_unmounted(char *dev, char *nLabel)
+{
+ struct btrfs_root *root;
+ struct btrfs_trans_handle *trans;
+
+ /* Open the super_block at the default location
+ * and as read-write.
+ */
+ root = open_ctree(dev, 0, 1);
+
+ trans = btrfs_start_transaction(root, 1);
+ strncpy(root->fs_info->super_copy.label, nLabel, BTRFS_LABEL_SIZE);
+ btrfs_commit_transaction(trans, root);
+
+ /* Now we close it since we are done. */
+ close_ctree(root);
+}
+
+static void get_label_unmounted(char *dev)
+{
+ struct btrfs_root *root;
+
+ /* Open the super_block at the default location
+ * and as read-only.
+ */
+ root = open_ctree(dev, 0, 0);
+
+ fprintf(stdout, "%s\n", root->fs_info->super_copy.label);
+
+ /* Now we close it since we are done. */
+ close_ctree(root);
+}
+
+int get_label(char *btrfs_dev)
+{
+
+ int ret;
+ ret = check_mounted(btrfs_dev);
+ if (ret < 0)
+ {
+ fprintf(stderr, "FATAL: error checking %s mount status\n", btrfs_dev);
+ return -1;
+ }
+
+ if(ret != 0)
+ {
+ fprintf(stderr, "FATAL: the filesystem has to be unmounted\n");
+ return -2;
+ }
+ get_label_unmounted(btrfs_dev);
+ return 0;
+}
+
+
+int set_label(char *btrfs_dev, char *nLabel)
+{
+
+ int ret;
+ ret = check_mounted(btrfs_dev);
+ if (ret < 0)
+ {
+ fprintf(stderr, "FATAL: error checking %s mount status\n", btrfs_dev);
+ return -1;
+ }
+
+ if(ret != 0)
+ {
+ fprintf(stderr, "FATAL: the filesystem has to be unmounted\n");
+ return -2;
+ }
+ change_label_unmounted(btrfs_dev, nLabel);
+ return 0;
+}