diff --git a/ntfstools/ntfslabel.c b/ntfstools/ntfslabel.c index e69de29b..5d07c0d0 100644 --- a/ntfstools/ntfslabel.c +++ b/ntfstools/ntfslabel.c @@ -0,0 +1,247 @@ +/* + * $Id$ + * + * ntfslabel - Part of the Linux-NTFS project. + * + * Copyright (c) 2002 Matthew J. Fanto + * Copyright (c) 2002 Anton Altaparmakov + * Copyright (c) 2002 Richard Russon + * + * This utility will display/change the label on an NTFS partition. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * 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 (in the main directory of the Linux-NTFS + * distribution in the file COPYING); if not, write to the Free Software + * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include "config.h" + +#include +#include +#include +#include +#include + +#include "debug.h" +#include "mft.h" + +/* + * print_label - display the current label of a mounted ntfs partition. + * @dev: device to read the label from + * @mnt_flags: mount flags of the device or 0 if not mounted + * @mnt_point: mount point of the device or NULL + * + * Print the label of the device @dev to stdout. + */ +void print_label(const char *dev, const unsigned long mnt_flags, + const char *mnt_point) +{ + ntfs_volume *vol; + + if (mnt_point) { + // Try ioctl and finish if present. + // goto finished; + } + if ((mnt_flags & (NTFS_MF_MOUNTED | NTFS_MF_READONLY)) == + NTFS_MF_MOUNTED) { + fprintf(stderr, "%s is mounted read-write, results may be " + "unreliable.\n", dev); + } + vol = ntfs_mount(dev, MS_RDONLY); + if (!vol) { + fprintf(stderr, "ntfs_mount() on device %s failed: %s\n", dev, + strerror(errno)); + exit(1); + } +//finished: + printf("%s\n", vol->vol_name); + if (ntfs_umount(vol, 0)) + ntfs_umount(vol, 1); +} + +/* + * resize_resident_attribute_value - resize a resident attribute + * @m: mft record containing attribute to resize + * @a: attribute record (inside @m) which to resize + * @new_vsize: the new attribute value size to resize the attribute to + * + * Return 0 on success and -1 with errno = ENOSPC if not enough space in the + * mft record. + */ +int resize_resident_attribute_value(MFT_RECORD *m, ATTR_RECORD *a, + const u32 new_vsize) +{ + int new_alen, new_muse; + + /* New attribute length and mft record bytes used. */ + new_alen = (le16_to_cpu(a->value_offset) + new_vsize + 7) & ~7; + new_muse = le32_to_cpu(m->bytes_in_use) - le32_to_cpu(a->length) + + new_alen; + /* Check for sufficient space. */ + if (new_muse > le32_to_cpu(m->bytes_allocated)) { + errno = ENOSPC; + return -1; + } + /* Move attributes behind @a to their new location. */ + memmove((char*)a + new_alen, (char*)a + le32_to_cpu(a->length), + le32_to_cpu(m->bytes_in_use) - ((char*)a - (char*)m) - + le32_to_cpu(a->length)); + /* Adjust @m to reflect change in used space. */ + m->bytes_in_use = cpu_to_le32(new_muse); + /* Adjust @a to reflect new value size. */ + a->length = cpu_to_le32(new_alen); + a->value_length = cpu_to_le32(new_vsize); + return 0; +} + +/* + * change_label - change the current label on a device + * @dev: device to change the label on + * @mnt_flags: mount flags of the device or 0 if not mounted + * @mnt_point: mount point of the device or NULL + * @label: the new label + * + * Change the label on the device @dev to @label. + */ +void change_label(const char *dev, const unsigned long mnt_flags, + const char *mnt_point, char *label, BOOL force) +{ + ntfs_attr_search_ctx *ctx = NULL; + uchar_t *new_label = NULL; + MFT_RECORD *mrec = NULL; + ATTR_RECORD *a; + ntfs_volume *vol; + int label_len, err = 1; + + if (mnt_point) { + // Try ioctl and return if present. + // return; + } + if (mnt_flags & NTFS_MF_MOUNTED) { + /* If not the root fs or mounted read/write, refuse change. */ + if (!(mnt_flags & NTFS_MF_ISROOT) || + !(mnt_flags & NTFS_MF_READONLY)) { + if (!force) { + fprintf(stderr, "Refusing to change label on " + "read-%s mounted device %s.\n", + mnt_flags & NTFS_MF_READONLY ? + "only" : "write", dev); + return; + } + } + } + vol = ntfs_mount(dev, 0); + if (!vol) { + fprintf(stderr, "ntfs_mount() on device %s failed: %s\n", dev, + strerror(errno)); + exit(1); + } + if (ntfs_read_file_record(vol, (MFT_REF)FILE_Volume, &mrec, NULL)) { + perror("Error reading file record"); + goto err_out; + } + if (!(mrec->flags & MFT_RECORD_IN_USE)) { + fprintf(stderr, "Error: $Volume has been deleted. Run " + "chkdsk to fix this.\n"); + goto err_out; + } + ctx = ntfs_get_attr_search_ctx(NULL, mrec); + if (!ctx) { + perror("Failed to get attribute search context"); + goto err_out; + } + if (ntfs_lookup_attr(AT_VOLUME_NAME, AT_UNNAMED, 0, 0, 0, NULL, 0, ctx)) { + perror("Lookup of $VOLUME_NAME attribute failed"); + goto err_out; + } + a = ctx->attr; + if (a->non_resident) { + fprintf(stderr, "Error: Attribute $VOLUME_NAME must be " + "resident.\n"); + goto err_out; + } + label_len = ntfs_mbstoucs(label, &new_label, 0); + if (label_len == -1) { + perror("Unable to convert label string to Unicode"); + goto err_out; + } + label_len *= sizeof(uchar_t); + if (label_len > 0x100) { + fprintf(stderr, "New label is too long. Maximum %i characters " + "allowed. Truncating excess characters.\n", + 0x100 / sizeof(uchar_t)); + label_len = 0x100; + new_label[label_len / sizeof(uchar_t)] = cpu_to_le16(L'\0'); + } + if (resize_resident_attribute_value(mrec, a, label_len)) { + perror("Error resizing resident attribute"); + goto err_out; + } + memcpy((char*)a + le16_to_cpu(a->value_offset), new_label, label_len); + if (ntfs_write_mft_record(vol, (MFT_REF)FILE_Volume, mrec)) { + perror("Error writing MFT Record to disk"); + goto err_out; + } + err = 0; +err_out: + if (new_label) + free(new_label); + if (mrec) + free(mrec); + if (ntfs_umount(vol, 0)) + ntfs_umount(vol, 1); + if (err) + exit(1); +} + +int main(int argc, char **argv) +{ + const char *AUTHOR = "Matthew Fanto"; + char *EXEC_NAME = "ntfslabel"; + char *locale, *mnt_point = NULL; + unsigned long mnt_flags; + int err; + // FIXME:Implement option -F meaning force the change. + BOOL force = 0; + + locale = setlocale(LC_ALL, ""); + if (!locale) { + char *locale; + + locale = setlocale(LC_ALL, NULL); + Dprintf("Failed to set locale, using default (%s).\n", locale); + } else + Dprintf("Using locale %s.\n", locale); + if (argc && *argv) + EXEC_NAME = *argv; + if (argc < 2 || argc > 3) { + fprintf(stderr, "%s v%s - %s\n", EXEC_NAME, VERSION, AUTHOR); + fprintf(stderr, "Usage: ntfslabel device [newlabel]\n"); + exit(1); + } + err = ntfs_check_if_mounted(argv[1], &mnt_flags); + if (err) + fprintf(stderr, "Failed to determine whether %s is mounted: " + "%s\n", argv[1], strerror(errno)); + else if (mnt_flags & NTFS_MF_MOUNTED) { + // Not implemented yet. Will be used for ioctl interface to driver. + // mnt_point = ntfs_get_mount_point(argv[1]); + } + if (argc == 2) + print_label(argv[1], mnt_flags, mnt_point); + else + change_label(argv[1], mnt_flags, mnt_point, argv[2], force); + return 0; +} +