geom_vol_ffs.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/11.2/sys/geom/geom_vol_ffs.c 332640 2018-04-17 02:18:04Z kevans $");
   29 
   30 #include <sys/param.h>
   31 #include <sys/errno.h>
   32 #include <sys/systm.h>
   33 #include <sys/sysctl.h>
   34 #include <sys/kernel.h>
   35 #include <sys/malloc.h>
   36 #include <sys/bio.h>
   37 #include <sys/lock.h>
   38 #include <sys/mutex.h>
   39 
   40 #include <ufs/ufs/dinode.h>
   41 #include <ufs/ffs/fs.h>
   42 
   43 #include <geom/geom.h>
   44 #include <geom/geom_slice.h>
   45 
   46 FEATURE(geom_vol, "GEOM support for volume names from UFS superblock");
   47 
   48 #define VOL_FFS_CLASS_NAME "VOL_FFS"
   49 
   50 static int superblocks[] = SBLOCKSEARCH;
   51 static int g_vol_ffs_once;
   52 
   53 struct g_vol_ffs_softc {
   54         char *  vol;
   55 };
   56 
   57 static int
   58 g_vol_ffs_start(struct bio *bp __unused)
   59 {
   60         return(0);
   61 }
   62 
   63 static struct g_geom *
   64 g_vol_ffs_taste(struct g_class *mp, struct g_provider *pp, int flags)
   65 {
   66         struct g_geom *gp;
   67         struct g_consumer *cp;
   68         struct g_vol_ffs_softc *ms;
   69         int sb, superblock;
   70         struct fs *fs;
   71 
   72         g_trace(G_T_TOPOLOGY, "vol_taste(%s,%s)", mp->name, pp->name);
   73         g_topology_assert();
   74 
   75         /* 
   76          * XXX This is a really weak way to make sure we don't recurse.
   77          * Probably ought to use BIO_GETATTR to check for this.
   78          */
   79         if (flags == G_TF_NORMAL &&
   80             !strcmp(pp->geom->class->name, VOL_FFS_CLASS_NAME))
   81                 return (NULL);
   82 
   83         gp = g_slice_new(mp, 1, pp, &cp, &ms, sizeof(*ms), g_vol_ffs_start);
   84         if (gp == NULL)
   85                 return (NULL);
   86         g_topology_unlock();
   87         /*
   88          * Walk through the standard places that superblocks hide and look
   89          * for UFS magic. If we find magic, then check that the size in the
   90          * superblock corresponds to the size of the underlying provider.
   91          * Finally, look for a volume label and create an appropriate 
   92          * provider based on that.
   93          */
   94         for (sb=0; (superblock = superblocks[sb]) != -1; sb++) {
   95                 /*
   96                  * Take care not to issue an invalid I/O request.  The
   97                  * offset and size of the superblock candidate must be
   98                  * multiples of the provider's sector size, otherwise an
   99                  * FFS can't exist on the provider anyway.
  100                  */
  101                 if (superblock % cp->provider->sectorsize != 0 ||
  102                     SBLOCKSIZE % cp->provider->sectorsize != 0)
  103                         continue;
  104 
  105                 fs = (struct fs *) g_read_data(cp, superblock,
  106                         SBLOCKSIZE, NULL);
  107                 if (fs == NULL)
  108                         continue;
  109                 /* Check for magic and make sure things are the right size */
  110                 if (fs->fs_magic == FS_UFS1_MAGIC) {
  111                         if (fs->fs_old_size * fs->fs_fsize !=
  112                             (int32_t) pp->mediasize) {
  113                                 g_free(fs);
  114                                 continue;
  115                         }
  116                 } else if (fs->fs_magic == FS_UFS2_MAGIC) {
  117                         if (fs->fs_size * fs->fs_fsize !=
  118                             (int64_t) pp->mediasize) {
  119                                 g_free(fs);
  120                                 continue;
  121                         }
  122                 } else {
  123                         g_free(fs);
  124                         continue;
  125                 }
  126                 /* Check for volume label */
  127                 if (fs->fs_volname[0] == '\0') {
  128                         g_free(fs);
  129                         continue;
  130                 }
  131                 /* XXX We need to check for namespace conflicts. */
  132                 /* XXX How do you handle a mirror set? */
  133                 /* XXX We don't validate the volume name. */
  134                 g_topology_lock();
  135                 /* Alright, we have a label and a volume name, reconfig. */
  136                 g_slice_config(gp, 0, G_SLICE_CONFIG_SET, (off_t) 0,
  137                     pp->mediasize, pp->sectorsize, "vol/%s",
  138                     fs->fs_volname);
  139                 g_free(fs);
  140                 g_topology_unlock();
  141                 break;
  142         }
  143         g_topology_lock();
  144         g_access(cp, -1, 0, 0);
  145         if (LIST_EMPTY(&gp->provider)) {
  146                 g_slice_spoiled(cp);
  147                 return (NULL);
  148         }
  149         if (!g_vol_ffs_once) {
  150                 g_vol_ffs_once = 1;
  151                 printf(
  152                     "WARNING: geom_vol_Ffs (geom %s) is deprecated, "
  153                     "use glabel instead.\n", gp->name);
  154         }
  155         return (gp);
  156 }
  157 
  158 static struct g_class g_vol_ffs_class   = {
  159         .name = VOL_FFS_CLASS_NAME,
  160         .version = G_VERSION,
  161         .taste = g_vol_ffs_taste,
  162 };
  163 
  164 DECLARE_GEOM_CLASS(g_vol_ffs_class, g_vol_ffs);
  165 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