124 lines
3.3 KiB
C
124 lines
3.3 KiB
C
/*-
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* Copyright (c) 2005 Takanori Watanabe
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <fs/ntfs/ntfs.h>
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#include <geom/geom.h>
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#include <geom/label/g_label.h>
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#define G_LABEL_NTFS_DIR "ntfs"
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static void
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g_label_ntfs_taste(struct g_consumer *cp, char *label, size_t size)
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{
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struct g_provider *pp;
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struct bootfile *bf;
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struct attr *atr;
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char *filerecp = NULL, *ap, vnchar;
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struct filerec *fr;
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char mftrecsz;
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int recsize;
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int j;
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off_t voloff;
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g_topology_assert_not();
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pp = cp->provider;
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label[0] = '\0';
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bf = (struct bootfile *)g_read_data(cp, 0, pp->sectorsize, NULL);
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if (bf == NULL || strncmp(bf->bf_sysid, "NTFS ", 8) != 0) {
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goto done;
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}
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mftrecsz = (char)bf->bf_mftrecsz;
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recsize = (mftrecsz > 0) ? (mftrecsz * bf->bf_bps * bf->bf_spc) : (1 << -mftrecsz);
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if(recsize % pp->sectorsize != 0)
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goto done;
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voloff = bf->bf_mftcn * bf->bf_spc * bf->bf_bps +
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recsize * NTFS_VOLUMEINO;
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if(voloff % pp->sectorsize != 0)
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goto done;
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filerecp = g_read_data(cp, voloff, recsize, NULL);
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if (filerecp == NULL)
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goto done;
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fr = (struct filerec *)filerecp;
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if(fr->fr_fixup.fh_magic != NTFS_FILEMAGIC){
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label[0] = 0;
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goto done;
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}
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for (ap = filerecp + fr->fr_attroff; atr = (struct attr *)ap, atr->a_hdr.a_type != -1; ap += atr->a_hdr.reclen) {
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if (atr->a_hdr.a_type == NTFS_A_VOLUMENAME) {
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if(atr->a_r.a_datalen >= size *2){
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label[0] = 0;
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goto done;
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}
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/*
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*UNICODE to ASCII.
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* Should we need to use iconv(9)?
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*/
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for (j = 0; j < atr->a_r.a_datalen; j++) {
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vnchar = *(ap + atr->a_r.a_dataoff + j);
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if ((j & 1)) {
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if (vnchar) {
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label[0] = 0;
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goto done;
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}
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} else {
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label[j / 2] = vnchar;
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}
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}
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label[j / 2] = 0;
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break;
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}
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}
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done:
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if (bf != NULL)
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g_free(bf);
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if (filerecp != NULL)
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g_free(filerecp);
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return;
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}
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const struct g_label_desc g_label_ntfs = {
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.ld_taste = g_label_ntfs_taste,
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.ld_dir = G_LABEL_NTFS_DIR
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};
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