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_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("$FreeBSD$");
   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 
   57         g_topology_assert_not();
   58         pp = cp->provider;
   59         label[0] = '\0';
   60 
   61         if ((EXT2FS_SB_OFFSET % pp->sectorsize) != 0)
   62                 return;
   63 
   64         fs = (e2sb_t *)g_read_data(cp, EXT2FS_SB_OFFSET, pp->sectorsize, NULL);
   65         if (fs == NULL)
   66                 return;
   67 
   68         /* Check for magic and versio n*/
   69         if (fs->s_magic == EXT2_SUPER_MAGIC &&
   70             fs->s_rev_level == EXT2_DYNAMIC_REV) {
   71                 G_LABEL_DEBUG(1, "ext2fs file system detected on %s.",
   72                     pp->name);
   73         } else {
   74                 goto exit_free;
   75         }
   76 
   77         /* Check for volume label */
   78         if (fs->s_volume_name[0] == '\0')
   79                 goto exit_free;
   80 
   81         /* Terminate label */
   82         fs->s_volume_name[sizeof(fs->s_volume_name) - 1] = '\0';
   83         strlcpy(label, fs->s_volume_name, size);
   84 
   85 exit_free:
   86         g_free(fs);
   87 }
   88 
   89 const struct g_label_desc g_label_ext2fs = {
   90         .ld_taste = g_label_ext2fs_taste,
   91         .ld_dir = "ext2fs"
   92 };

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