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_ufs.c

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    1 /*-
    2  * Copyright (c) 2002, 2003 Gordon Tetlow
    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: src/sys/geom/label/g_label_ufs.c,v 1.1.2.1 2005/03/01 13:58:47 pjd Exp $");
   29 
   30 #include <sys/param.h>
   31 #include <sys/systm.h>
   32 #include <sys/kernel.h>
   33 #include <sys/malloc.h>
   34 
   35 #include <ufs/ufs/dinode.h>
   36 #include <ufs/ffs/fs.h>
   37 
   38 #include <geom/geom.h>
   39 #include <geom/label/g_label.h>
   40 
   41 #define G_LABEL_UFS_DIR "ufs"
   42 
   43 static const int superblocks[] = SBLOCKSEARCH;
   44 
   45 static void
   46 g_label_ufs_taste(struct g_consumer *cp, char *label, size_t size)
   47 {
   48         struct g_provider *pp;
   49         int error, sb, superblock;
   50         struct fs *fs;
   51 
   52         g_topology_assert_not();
   53         pp = cp->provider;
   54         label[0] = '\0';
   55         /*
   56          * Walk through the standard places that superblocks hide and look
   57          * for UFS magic. If we find magic, then check that the size in the
   58          * superblock corresponds to the size of the underlying provider.
   59          * Finally, look for a volume label and create an appropriate 
   60          * provider based on that.
   61          */
   62         for (sb = 0; (superblock = superblocks[sb]) != -1; sb++) {
   63                 /*
   64                  * Take care not to issue an invalid I/O request.  The
   65                  * offset and size of the superblock candidate must be
   66                  * multiples of the provider's sector size, otherwise an
   67                  * FFS can't exist on the provider anyway.
   68                  */
   69                 if (superblock % cp->provider->sectorsize != 0 ||
   70                     SBLOCKSIZE % cp->provider->sectorsize != 0)
   71                         continue;
   72 
   73                 fs = (struct fs *)g_read_data(cp, superblock, SBLOCKSIZE,
   74                     &error);
   75                 if (fs == NULL || error != 0)
   76                         continue;
   77                 /* Check for magic and make sure things are the right size */
   78                 if (fs->fs_magic == FS_UFS1_MAGIC) {
   79                         G_LABEL_DEBUG(1, "UFS1 file system detected on %s.",
   80                             pp->name);
   81                         if (fs->fs_old_size * fs->fs_fsize !=
   82                             (int32_t)pp->mediasize) {
   83                                 g_free(fs);
   84                                 continue;
   85                         }
   86                 } else if (fs->fs_magic == FS_UFS2_MAGIC) {
   87                         G_LABEL_DEBUG(1, "UFS2 file system detected on %s.",
   88                             pp->name);
   89                         if (fs->fs_size * fs->fs_fsize !=
   90                             (int64_t)pp->mediasize) {
   91                                 g_free(fs);
   92                                 continue;
   93                         }
   94                 } else {
   95                         g_free(fs);
   96                         continue;
   97                 }
   98                 /* Check for volume label */
   99                 if (fs->fs_volname[0] == '\0') {
  100                         g_free(fs);
  101                         continue;
  102                 }
  103                 strlcpy(label, fs->fs_volname, size);
  104                 g_free(fs);
  105                 break;
  106         }
  107 }
  108 
  109 const struct g_label_desc g_label_ufs = {
  110         .ld_taste = g_label_ufs_taste,
  111         .ld_dir = G_LABEL_UFS_DIR
  112 };

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