g_label_ext2fs.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: releng/11.0/sys/geom/label/g_label_ext2fs.c 219400 2011-03-08 17:00:31Z sobomax $");
   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 EXT2FS_SB_OFFSET        1024
   39 #define EXT2_SUPER_MAGIC        0xef53
   40 #define EXT2_DYNAMIC_REV        1
   41 
   42 typedef struct e2sb {
   43         uint8_t         fake1[56];
   44         uint16_t        s_magic;
   45         uint8_t         fake2[18];
   46         uint32_t        s_rev_level;
   47         uint8_t         fake3[40];
   48         char            s_volume_name[16];
   49 } e2sb_t;
   50 
   51 static void
   52 g_label_ext2fs_taste(struct g_consumer *cp, char *label, size_t size)
   53 {
   54         struct g_provider *pp;
   55         e2sb_t *fs;
   56         char *s_volume_name;
   57 
   58         g_topology_assert_not();
   59         pp = cp->provider;
   60         label[0] = '\0';
   61 
   62         if ((EXT2FS_SB_OFFSET % pp->sectorsize) != 0)
   63                 return;
   64 
   65         fs = (e2sb_t *)g_read_data(cp, EXT2FS_SB_OFFSET, pp->sectorsize, NULL);
   66         if (fs == NULL)
   67                 return;
   68 
   69         /* Check for magic and versio n*/
   70         if (fs->s_magic == EXT2_SUPER_MAGIC &&
   71             fs->s_rev_level == EXT2_DYNAMIC_REV) {
   72                 G_LABEL_DEBUG(1, "ext2fs file system detected on %s.",
   73                     pp->name);
   74         } else {
   75                 goto exit_free;
   76         }
   77 
   78         s_volume_name = fs->s_volume_name;
   79         /* Terminate label */
   80         s_volume_name[sizeof(fs->s_volume_name) - 1] = '\0';
   81 
   82         if (s_volume_name[0] == '/')
   83                 s_volume_name += 1;
   84 
   85         /* Check for volume label */
   86         if (s_volume_name[0] == '\0')
   87                 goto exit_free;
   88 
   89         strlcpy(label, s_volume_name, size);
   90 
   91 exit_free:
   92         g_free(fs);
   93 }
   94 
   95 struct g_label_desc g_label_ext2fs = {
   96         .ld_taste = g_label_ext2fs_taste,
   97         .ld_dir = "ext2fs",
   98         .ld_enabled = 1
   99 };
  100 
  101 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

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sys/geom/label/g_label_ext2fs.c