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FreeBSD/Linux Kernel Cross Reference
sys/geom/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: src/sys/geom/geom_vol_ffs.c,v 1.14.2.1 2005/12/29 05:59:51 sobomax Exp $");
   29 
   30 #include <sys/param.h>
   31 #include <sys/errno.h>
   32 #include <sys/systm.h>
   33 #include <sys/kernel.h>
   34 #include <sys/malloc.h>
   35 #include <sys/bio.h>
   36 #include <sys/lock.h>
   37 #include <sys/mutex.h>
   38 
   39 #include <ufs/ufs/dinode.h>
   40 #include <ufs/ffs/fs.h>
   41 
   42 #include <geom/geom.h>
   43 #include <geom/geom_slice.h>
   44 
   45 #define VOL_FFS_CLASS_NAME "VOL_FFS"
   46 
   47 static int superblocks[] = SBLOCKSEARCH;
   48 
   49 struct g_vol_ffs_softc {
   50         char *  vol;
   51 };
   52 
   53 static int
   54 g_vol_ffs_start(struct bio *bp __unused)
   55 {
   56         return(0);
   57 }
   58 
   59 static struct g_geom *
   60 g_vol_ffs_taste(struct g_class *mp, struct g_provider *pp, int flags)
   61 {
   62         struct g_geom *gp;
   63         struct g_consumer *cp;
   64         struct g_vol_ffs_softc *ms;
   65         int sb, superblock;
   66         struct fs *fs;
   67 
   68         g_trace(G_T_TOPOLOGY, "vol_taste(%s,%s)", mp->name, pp->name);
   69         g_topology_assert();
   70 
   71         /* 
   72          * XXX This is a really weak way to make sure we don't recurse.
   73          * Probably ought to use BIO_GETATTR to check for this.
   74          */
   75         if (flags == G_TF_NORMAL &&
   76             !strcmp(pp->geom->class->name, VOL_FFS_CLASS_NAME))
   77                 return (NULL);
   78 
   79         gp = g_slice_new(mp, 1, pp, &cp, &ms, sizeof(*ms), g_vol_ffs_start);
   80         if (gp == NULL)
   81                 return (NULL);
   82         g_topology_unlock();
   83         /*
   84          * Walk through the standard places that superblocks hide and look
   85          * for UFS magic. If we find magic, then check that the size in the
   86          * superblock corresponds to the size of the underlying provider.
   87          * Finally, look for a volume label and create an appropriate 
   88          * provider based on that.
   89          */
   90         for (sb=0; (superblock = superblocks[sb]) != -1; sb++) {
   91                 /*
   92                  * Take care not to issue an invalid I/O request.  The
   93                  * offset and size of the superblock candidate must be
   94                  * multiples of the provider's sector size, otherwise an
   95                  * FFS can't exist on the provider anyway.
   96                  */
   97                 if (superblock % cp->provider->sectorsize != 0 ||
   98                     SBLOCKSIZE % cp->provider->sectorsize != 0)
   99                         continue;
  100 
  101                 fs = (struct fs *) g_read_data(cp, superblock,
  102                         SBLOCKSIZE, NULL);
  103                 if (fs == NULL)
  104                         continue;
  105                 /* Check for magic and make sure things are the right size */
  106                 if (fs->fs_magic == FS_UFS1_MAGIC) {
  107                         if (fs->fs_old_size * fs->fs_fsize !=
  108                             (int32_t) pp->mediasize) {
  109                                 g_free(fs);
  110                                 continue;
  111                         }
  112                 } else if (fs->fs_magic == FS_UFS2_MAGIC) {
  113                         if (fs->fs_size * fs->fs_fsize !=
  114                             (int64_t) pp->mediasize) {
  115                                 g_free(fs);
  116                                 continue;
  117                         }
  118                 } else {
  119                         g_free(fs);
  120                         continue;
  121                 }
  122                 /* Check for volume label */
  123                 if (fs->fs_volname[0] == '\0') {
  124                         g_free(fs);
  125                         continue;
  126                 }
  127                 /* XXX We need to check for namespace conflicts. */
  128                 /* XXX How do you handle a mirror set? */
  129                 /* XXX We don't validate the volume name. */
  130                 g_topology_lock();
  131                 /* Alright, we have a label and a volume name, reconfig. */
  132                 g_slice_config(gp, 0, G_SLICE_CONFIG_SET, (off_t) 0,
  133                     pp->mediasize, pp->sectorsize, "vol/%s",
  134                     fs->fs_volname);
  135                 g_free(fs);
  136                 g_topology_unlock();
  137                 break;
  138         }
  139         g_topology_lock();
  140         g_access(cp, -1, 0, 0);
  141         if (LIST_EMPTY(&gp->provider)) {
  142                 g_slice_spoiled(cp);
  143                 return (NULL);
  144         }
  145         return (gp);
  146 }
  147 
  148 static struct g_class g_vol_ffs_class   = {
  149         .name = VOL_FFS_CLASS_NAME,
  150         .version = G_VERSION,
  151         .taste = g_vol_ffs_taste,
  152 };
  153 
  154 DECLARE_GEOM_CLASS(g_vol_ffs_class, g_vol_ffs);

Cache object: aaa33b5b6dfe64987d54ae76e8b1b8cd


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