mirror of
https://github.com/kdave/btrfs-progs
synced 2025-01-27 16:02:56 +00:00
e8f47cf068
Hi all, this patch adds the command "btrfs filesystem label" to change (or show) the label of a filesystem. This patch is a subset of the one written previously by Morey Roof. I included the user space part only. So it is possible only to change/show a label of a *single device* and *unounted* filesystem. The reason of excluding the kernel space part, is to simplify the patch in order to speed the check and then the merging of the patch itself. In fact I have to point out that in the past there was almost three attempts to propose this patch, without success neither complaints. Chris, let me know how you want to proceed. I know that you are very busy, and you prefer to work to stabilize btrfs instead adding new feature. But I think that changing a label is a *essential* feature for a filesystem managing tool. Think about a mount by LABEL. To show a label $ btrfs filesystem label <device> To set a label $ btrfs filesystem label <device> <newlabel> Please guys, give a look to the source. Comments are welcome. You can pull the source from the branch "label" of the repository http://cassiopea.homelinux.net/git/btrfs-progs-unstable.git Regards G.Baroncelli Signed-off-by: Chris Mason <chris.mason@oracle.com>
122 lines
2.9 KiB
C
122 lines
2.9 KiB
C
/*
|
|
* 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;
|
|
}
|