g_label_ext2fs.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 EXT2FS_SB_OFFSET        1024
   42 #define EXT2_SUPER_MAGIC        0xef53
   43 #define EXT2_DYNAMIC_REV        1
   44 
   45 typedef struct e2sb {
   46         uint8_t         fake1[56];
   47         uint16_t        s_magic;
   48         uint8_t         fake2[18];
   49         uint32_t        s_rev_level;
   50         uint8_t         fake3[40];
   51         char            s_volume_name[16];
   52 } e2sb_t;
   53 
   54 static void
   55 g_label_ext2fs_taste(struct g_consumer *cp, char *label, size_t size)
   56 {
   57         struct g_provider *pp;
   58         e2sb_t *fs;
   59         char *s_volume_name;
   60 
   61         g_topology_assert_not();
   62         pp = cp->provider;
   63         label[0] = '\0';
   64 
   65         KASSERT(pp->sectorsize != 0, ("Tasting a disk with 0 sectorsize"));
   66         if (pp->sectorsize < sizeof(*fs))
   67                 return;
   68         if ((EXT2FS_SB_OFFSET % pp->sectorsize) != 0)
   69                 return;
   70 
   71         fs = g_read_data(cp, EXT2FS_SB_OFFSET, pp->sectorsize, NULL);
   72         if (fs == NULL)
   73                 return;
   74 
   75         /* Check for magic and versio n*/
   76         if (fs->s_magic == EXT2_SUPER_MAGIC &&
   77             fs->s_rev_level == EXT2_DYNAMIC_REV) {
   78                 G_LABEL_DEBUG(1, "ext2fs file system detected on %s.",
   79                     pp->name);
   80         } else {
   81                 goto exit_free;
   82         }
   83 
   84         s_volume_name = fs->s_volume_name;
   85         /* Terminate label */
   86         s_volume_name[sizeof(fs->s_volume_name) - 1] = '\0';
   87 
   88         if (s_volume_name[0] == '/')
   89                 s_volume_name += 1;
   90 
   91         /* Check for volume label */
   92         if (s_volume_name[0] == '\0')
   93                 goto exit_free;
   94 
   95         strlcpy(label, s_volume_name, size);
   96 
   97 exit_free:
   98         g_free(fs);
   99 }
  100 
  101 struct g_label_desc g_label_ext2fs = {
  102         .ld_taste = g_label_ext2fs_taste,
  103         .ld_dirprefix = "ext2fs/",
  104         .ld_enabled = 1
  105 };
  106 
  107 G_LABEL_INIT(ext2fs, g_label_ext2fs, "Create device nodes for EXT2FS volumes");

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FreeBSD/Linux Kernel Cross Reference sys/geom/label/g_label_ext2fs.c

FreeBSD/Linux Kernel Cross Reference
sys/geom/label/g_label_ext2fs.c