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  * Copyright (c) 2004 Pawel Jakub Dawidek <pjd@FreeBSD.org>
    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 AUTHORS 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 AUTHORS 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: releng/10.4/sys/geom/label/g_label_iso9660.c 286193 2015-08-02 10:08:57Z trasz $");
   29 
   30 #include <sys/param.h>
   31 #include <sys/systm.h>
   32 #include <sys/kernel.h>
   33 #include <sys/malloc.h>
   34 
   35 #include <geom/geom.h>
   36 #include <geom/label/g_label.h>
   37 
   38 #define G_LABEL_ISO9660_DIR     "iso9660"
   39 
   40 #define ISO9660_MAGIC   "\x01" "CD001" "\x01\x00"
   41 #define ISO9660_OFFSET  0x8000
   42 #define VOLUME_LEN      32
   43 
   44 
   45 static void
   46 g_label_iso9660_taste(struct g_consumer *cp, char *label, size_t size)
   47 {
   48         struct g_provider *pp;
   49         char *sector, *volume;
   50 
   51         g_topology_assert_not();
   52         pp = cp->provider;
   53         label[0] = '\0';
   54 
   55         if ((ISO9660_OFFSET % pp->sectorsize) != 0)
   56                 return;
   57         sector = (char *)g_read_data(cp, ISO9660_OFFSET, pp->sectorsize,
   58             NULL);
   59         if (sector == NULL)
   60                 return;
   61         if (bcmp(sector, ISO9660_MAGIC, sizeof(ISO9660_MAGIC) - 1) != 0) {
   62                 g_free(sector);
   63                 return;
   64         }
   65         G_LABEL_DEBUG(1, "ISO9660 file system detected on %s.", pp->name);
   66         volume = sector + 0x28;
   67         bzero(label, size);
   68         strlcpy(label, volume, MIN(size, VOLUME_LEN));
   69         g_free(sector);
   70         g_label_rtrim(label, size);
   71 }
   72 
   73 struct g_label_desc g_label_iso9660 = {
   74         .ld_taste = g_label_iso9660_taste,
   75         .ld_dir = G_LABEL_ISO9660_DIR,
   76         .ld_enabled = 1
   77 };
   78 
   79 G_LABEL_INIT(iso9660, g_label_iso9660, "Create device nodes for ISO9660 volume names");

Cache object: fc8f5efd077d33daea6f6f579d48adee


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