g_label_reiserfs.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2005 Stanislav Sedov
    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 AUTHOR 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 AUTHOR 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("$FreeBSD$");
   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/geom_dbg.h>
   39 #include <geom/label/g_label.h>
   40 
   41 #define REISERFS_NEW_DISK_OFFSET 64 * 1024
   42 #define REISERFS_OLD_DISK_OFFSET 8 * 1024
   43 #define REISERFS_SUPER_MAGIC    "ReIsEr"
   44 
   45 typedef struct reiserfs_sb {
   46         uint8_t         fake1[52];
   47         char            s_magic[10];
   48         uint8_t         fake2[10];
   49         uint16_t        s_version;
   50         uint8_t         fake3[26];
   51         char            s_volume_name[16];
   52 } reiserfs_sb_t;
   53 
   54 static reiserfs_sb_t *
   55 g_label_reiserfs_read_super(struct g_consumer *cp, off_t offset)
   56 {
   57         reiserfs_sb_t *fs;
   58         u_int secsize;
   59 
   60         secsize = cp->provider->sectorsize;
   61 
   62         KASSERT(secsize != 0, ("Tasting a disk with 0 sectorsize"));
   63         if (secsize < sizeof(*fs))
   64                 return (NULL);
   65         if ((offset % secsize) != 0)
   66                 return (NULL);
   67 
   68         fs = g_read_data(cp, offset, secsize, NULL);
   69         if (fs == NULL)
   70                 return (NULL);
   71 
   72         if (strncmp(fs->s_magic, REISERFS_SUPER_MAGIC,
   73             strlen(REISERFS_SUPER_MAGIC)) != 0) {
   74                 g_free(fs);
   75                 return (NULL);
   76         }
   77 
   78         return (fs);
   79 }
   80 
   81 static void
   82 g_label_reiserfs_taste(struct g_consumer *cp, char *label, size_t size)
   83 {
   84         struct g_provider *pp;
   85         reiserfs_sb_t *fs;
   86 
   87         g_topology_assert_not();
   88         pp = cp->provider;
   89         label[0] = '\0';
   90 
   91         /* Try old format */
   92         fs = g_label_reiserfs_read_super(cp, REISERFS_OLD_DISK_OFFSET);
   93         if (fs == NULL) {
   94                 /* Try new format */
   95                 fs = g_label_reiserfs_read_super(cp, REISERFS_NEW_DISK_OFFSET);
   96         }
   97         if (fs == NULL)
   98                 return;
   99 
  100         /* Check version */
  101         if (fs->s_version == 2) {
  102                 G_LABEL_DEBUG(1, "reiserfs file system detected on %s.",
  103                     pp->name);
  104         } else {
  105                 goto exit_free;
  106         }
  107 
  108         /* Check for volume label */
  109         if (fs->s_volume_name[0] == '\0')
  110                 goto exit_free;
  111 
  112         /* Terminate label */
  113         fs->s_volume_name[sizeof(fs->s_volume_name) - 1] = '\0';
  114         strlcpy(label, fs->s_volume_name, size);
  115 
  116 exit_free:
  117         g_free(fs);
  118 }
  119 
  120 struct g_label_desc g_label_reiserfs = {
  121         .ld_taste = g_label_reiserfs_taste,
  122         .ld_dirprefix = "reiserfs/",
  123         .ld_enabled = 1
  124 };
  125 
  126 G_LABEL_INIT(reiserfs, g_label_reiserfs, "Create device nodes for REISERFS volumes");

Cache object: 395ad99e0a1146e6f23f4b94286aafa9

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

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