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_iso9660.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2004 Pawel Jakub Dawidek <pjd@FreeBSD.org>
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD: stable/12/sys/geom/label/g_label_iso9660.c 326270 2017-11-27 15:17:37Z pfg $");
   31 
   32 #include <sys/param.h>
   33 #include <sys/systm.h>
   34 #include <sys/kernel.h>
   35 #include <sys/malloc.h>
   36 
   37 #include <geom/geom.h>
   38 #include <geom/label/g_label.h>
   39 
   40 #define G_LABEL_ISO9660_DIR     "iso9660"
   41 
   42 #define ISO9660_MAGIC   "\x01" "CD001" "\x01\x00"
   43 #define ISO9660_OFFSET  0x8000
   44 #define VOLUME_LEN      32
   45 
   46 
   47 static void
   48 g_label_iso9660_taste(struct g_consumer *cp, char *label, size_t size)
   49 {
   50         struct g_provider *pp;
   51         char *sector, *volume;
   52 
   53         g_topology_assert_not();
   54         pp = cp->provider;
   55         label[0] = '\0';
   56 
   57         if ((ISO9660_OFFSET % pp->sectorsize) != 0)
   58                 return;
   59         sector = (char *)g_read_data(cp, ISO9660_OFFSET, pp->sectorsize,
   60             NULL);
   61         if (sector == NULL)
   62                 return;
   63         if (bcmp(sector, ISO9660_MAGIC, sizeof(ISO9660_MAGIC) - 1) != 0) {
   64                 g_free(sector);
   65                 return;
   66         }
   67         G_LABEL_DEBUG(1, "ISO9660 file system detected on %s.", pp->name);
   68         volume = sector + 0x28;
   69         bzero(label, size);
   70         strlcpy(label, volume, MIN(size, VOLUME_LEN));
   71         g_free(sector);
   72         g_label_rtrim(label, size);
   73 }
   74 
   75 struct g_label_desc g_label_iso9660 = {
   76         .ld_taste = g_label_iso9660_taste,
   77         .ld_dir = G_LABEL_ISO9660_DIR,
   78         .ld_enabled = 1
   79 };
   80 
   81 G_LABEL_INIT(iso9660, g_label_iso9660, "Create device nodes for ISO9660 volume names");

Cache object: 56920af27c1d9851fbdaa1f4bbba075d


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