The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/geom/label/g_label_ntfs.c

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    1 /*-
    2  * Copyright (c) 2005 Takanori Watanabe
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: src/sys/geom/label/g_label_ntfs.c,v 1.5.2.2 2006/01/17 08:59:55 pjd Exp $");
   29 
   30 #include <sys/param.h>
   31 #include <sys/systm.h>
   32 #include <sys/kernel.h>
   33 #include <sys/malloc.h>
   34 
   35 #include <fs/ntfs/ntfs.h>
   36 
   37 #include <geom/geom.h>
   38 #include <geom/label/g_label.h>
   39 
   40 #define G_LABEL_NTFS_DIR        "ntfs"
   41 
   42 
   43 static void
   44 g_label_ntfs_taste(struct g_consumer *cp, char *label, size_t size)
   45 {
   46         struct g_provider *pp;
   47         struct bootfile *bf;
   48         struct filerec *fr;
   49         struct attr *atr;
   50         off_t voloff;
   51         char *filerecp, *ap;
   52         char mftrecsz, vnchar;
   53         int recsize, j;
   54 
   55         g_topology_assert_not();
   56 
   57         label[0] = '\0';
   58         pp = cp->provider;
   59         filerecp = NULL;
   60 
   61         bf = (struct bootfile *)g_read_data(cp, 0, pp->sectorsize, NULL);
   62         if (bf == NULL || strncmp(bf->bf_sysid, "NTFS    ", 8) != 0)
   63                 goto done;
   64 
   65         mftrecsz = (char)bf->bf_mftrecsz;
   66         recsize = (mftrecsz > 0) ? (mftrecsz * bf->bf_bps * bf->bf_spc) : (1 << -mftrecsz);
   67         if (recsize % pp->sectorsize != 0)
   68                 goto done;
   69 
   70         voloff = bf->bf_mftcn * bf->bf_spc * bf->bf_bps +
   71             recsize * NTFS_VOLUMEINO;
   72         if (voloff % pp->sectorsize != 0)
   73                 goto done;
   74 
   75         filerecp = g_read_data(cp, voloff, recsize, NULL);
   76         if (filerecp == NULL)
   77                 goto done;
   78         fr = (struct filerec *)filerecp;
   79 
   80         if (fr->fr_fixup.fh_magic != NTFS_FILEMAGIC)
   81                 goto done;
   82 
   83         for (ap = filerecp + fr->fr_attroff;
   84             atr = (struct attr *)ap, atr->a_hdr.a_type != -1;
   85             ap += atr->a_hdr.reclen) {
   86                 if (atr->a_hdr.a_type == NTFS_A_VOLUMENAME) {
   87                         if(atr->a_r.a_datalen >= size *2){
   88                                 label[0] = 0;
   89                                 goto done;
   90                         }
   91                         /*
   92                          *UNICODE to ASCII.
   93                          * Should we need to use iconv(9)?
   94                          */
   95                         for (j = 0; j < atr->a_r.a_datalen; j++) {
   96                                 vnchar = *(ap + atr->a_r.a_dataoff + j);
   97                                 if (j & 1) {
   98                                         if (vnchar) {
   99                                                 label[0] = 0;
  100                                                 goto done;
  101                                         }
  102                                 } else {
  103                                         label[j / 2] = vnchar;
  104                                 }
  105                         }
  106                         label[j / 2] = 0;
  107                         break;
  108                 }
  109         }
  110 done:
  111         if (bf != NULL)
  112                 g_free(bf);
  113         if (filerecp != NULL)
  114                 g_free(filerecp);
  115 }
  116 
  117 const struct g_label_desc g_label_ntfs = {
  118         .ld_taste = g_label_ntfs_taste,
  119         .ld_dir = G_LABEL_NTFS_DIR
  120 };

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