g_label_reiserfs.c

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

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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