geom_vol_ffs.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2002, 2003 Gordon Tetlow
    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/errno.h>
   34 #include <sys/systm.h>
   35 #include <sys/sysctl.h>
   36 #include <sys/kernel.h>
   37 #include <sys/malloc.h>
   38 #include <sys/bio.h>
   39 #include <sys/lock.h>
   40 #include <sys/mutex.h>
   41 
   42 #include <ufs/ufs/dinode.h>
   43 #include <ufs/ffs/fs.h>
   44 
   45 #include <geom/geom.h>
   46 #include <geom/geom_slice.h>
   47 
   48 FEATURE(geom_vol, "GEOM support for volume names from UFS superblock");
   49 
   50 #define VOL_FFS_CLASS_NAME "VOL_FFS"
   51 
   52 static int superblocks[] = SBLOCKSEARCH;
   53 static int g_vol_ffs_once;
   54 
   55 struct g_vol_ffs_softc {
   56         char *  vol;
   57 };
   58 
   59 static int
   60 g_vol_ffs_start(struct bio *bp __unused)
   61 {
   62         return(0);
   63 }
   64 
   65 static struct g_geom *
   66 g_vol_ffs_taste(struct g_class *mp, struct g_provider *pp, int flags)
   67 {
   68         struct g_geom *gp;
   69         struct g_consumer *cp;
   70         struct g_vol_ffs_softc *ms;
   71         int sb, superblock;
   72         struct fs *fs;
   73 
   74         g_trace(G_T_TOPOLOGY, "vol_taste(%s,%s)", mp->name, pp->name);
   75         g_topology_assert();
   76 
   77         /* 
   78          * XXX This is a really weak way to make sure we don't recurse.
   79          * Probably ought to use BIO_GETATTR to check for this.
   80          */
   81         if (flags == G_TF_NORMAL &&
   82             !strcmp(pp->geom->class->name, VOL_FFS_CLASS_NAME))
   83                 return (NULL);
   84 
   85         gp = g_slice_new(mp, 1, pp, &cp, &ms, sizeof(*ms), g_vol_ffs_start);
   86         if (gp == NULL)
   87                 return (NULL);
   88         g_topology_unlock();
   89         /*
   90          * Walk through the standard places that superblocks hide and look
   91          * for UFS magic. If we find magic, then check that the size in the
   92          * superblock corresponds to the size of the underlying provider.
   93          * Finally, look for a volume label and create an appropriate 
   94          * provider based on that.
   95          */
   96         for (sb=0; (superblock = superblocks[sb]) != -1; sb++) {
   97                 /*
   98                  * Take care not to issue an invalid I/O request.  The
   99                  * offset and size of the superblock candidate must be
  100                  * multiples of the provider's sector size, otherwise an
  101                  * FFS can't exist on the provider anyway.
  102                  */
  103                 if (superblock % cp->provider->sectorsize != 0 ||
  104                     SBLOCKSIZE % cp->provider->sectorsize != 0)
  105                         continue;
  106 
  107                 fs = (struct fs *) g_read_data(cp, superblock,
  108                         SBLOCKSIZE, NULL);
  109                 if (fs == NULL)
  110                         continue;
  111                 /* Check for magic and make sure things are the right size */
  112                 if (fs->fs_magic == FS_UFS1_MAGIC) {
  113                         if (fs->fs_old_size * fs->fs_fsize !=
  114                             (int32_t) pp->mediasize) {
  115                                 g_free(fs);
  116                                 continue;
  117                         }
  118                 } else if (fs->fs_magic == FS_UFS2_MAGIC) {
  119                         if (fs->fs_size * fs->fs_fsize !=
  120                             (int64_t) pp->mediasize) {
  121                                 g_free(fs);
  122                                 continue;
  123                         }
  124                 } else {
  125                         g_free(fs);
  126                         continue;
  127                 }
  128                 /* Check for volume label */
  129                 if (fs->fs_volname[0] == '\0') {
  130                         g_free(fs);
  131                         continue;
  132                 }
  133                 /* XXX We need to check for namespace conflicts. */
  134                 /* XXX How do you handle a mirror set? */
  135                 /* XXX We don't validate the volume name. */
  136                 g_topology_lock();
  137                 /* Alright, we have a label and a volume name, reconfig. */
  138                 g_slice_config(gp, 0, G_SLICE_CONFIG_SET, (off_t) 0,
  139                     pp->mediasize, pp->sectorsize, "vol/%s",
  140                     fs->fs_volname);
  141                 g_free(fs);
  142                 g_topology_unlock();
  143                 break;
  144         }
  145         g_topology_lock();
  146         g_access(cp, -1, 0, 0);
  147         if (LIST_EMPTY(&gp->provider)) {
  148                 g_slice_spoiled(cp);
  149                 return (NULL);
  150         }
  151         if (!g_vol_ffs_once) {
  152                 g_vol_ffs_once = 1;
  153                 printf(
  154                     "WARNING: geom_vol_Ffs (geom %s) is deprecated, "
  155                     "use glabel instead.\n", gp->name);
  156         }
  157         return (gp);
  158 }
  159 
  160 static struct g_class g_vol_ffs_class   = {
  161         .name = VOL_FFS_CLASS_NAME,
  162         .version = G_VERSION,
  163         .taste = g_vol_ffs_taste,
  164 };
  165 
  166 DECLARE_GEOM_CLASS(g_vol_ffs_class, g_vol_ffs);
  167 MODULE_VERSION(geom_vol_ffs, 0);

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FreeBSD/Linux Kernel Cross Reference sys/geom/geom_vol_ffs.c

FreeBSD/Linux Kernel Cross Reference
sys/geom/geom_vol_ffs.c