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: releng/5.3/sys/geom/label/g_label_ufs.c 131476 2004-07-02 19:40:36Z pjd $");
   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                 fs = (struct fs *)g_read_data(cp, superblock, SBLOCKSIZE,
   64                     &error);
   65                 if (fs == NULL || error != 0)
   66                         continue;
   67                 /* Check for magic and make sure things are the right size */
   68                 if (fs->fs_magic == FS_UFS1_MAGIC) {
   69                         G_LABEL_DEBUG(1, "UFS1 file system detected on %s.",
   70                             pp->name);
   71                         if (fs->fs_old_size * fs->fs_fsize !=
   72                             (int32_t)pp->mediasize) {
   73                                 g_free(fs);
   74                                 continue;
   75                         }
   76                 } else if (fs->fs_magic == FS_UFS2_MAGIC) {
   77                         G_LABEL_DEBUG(1, "UFS2 file system detected on %s.",
   78                             pp->name);
   79                         if (fs->fs_size * fs->fs_fsize !=
   80                             (int64_t)pp->mediasize) {
   81                                 g_free(fs);
   82                                 continue;
   83                         }
   84                 } else {
   85                         g_free(fs);
   86                         continue;
   87                 }
   88                 /* Check for volume label */
   89                 if (fs->fs_volname[0] == '\0') {
   90                         g_free(fs);
   91                         continue;
   92                 }
   93                 strlcpy(label, fs->fs_volname, size);
   94                 g_free(fs);
   95                 break;
   96         }
   97 }
   98 
   99 const struct g_label_desc g_label_ufs = {
  100         .ld_taste = g_label_ufs_taste,
  101         .ld_dir = G_LABEL_UFS_DIR
  102 };

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

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