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