g_label_ufs.c

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    1 /*-
    2  * Copyright (c) 2002, 2003 Gordon Tetlow
    3  * Copyright (c) 2006 Pawel Jakub Dawidek <pjd@FreeBSD.org>
    4  * All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
   16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
   19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   25  * SUCH DAMAGE.
   26  */
   27 
   28 #include <sys/cdefs.h>
   29 __FBSDID("$FreeBSD$");
   30 
   31 #include <sys/param.h>
   32 #include <sys/systm.h>
   33 #include <sys/kernel.h>
   34 #include <sys/malloc.h>
   35 
   36 #include <ufs/ufs/dinode.h>
   37 #include <ufs/ffs/fs.h>
   38 
   39 #include <geom/geom.h>
   40 #include <geom/label/g_label.h>
   41 
   42 #define G_LABEL_UFS_VOLUME_DIR  "ufs"
   43 #define G_LABEL_UFS_ID_DIR      "ufsid"
   44 
   45 #define G_LABEL_UFS_VOLUME      0
   46 #define G_LABEL_UFS_ID          1
   47 
   48 static const int superblocks[] = SBLOCKSEARCH;
   49 
   50 static void
   51 g_label_ufs_taste_common(struct g_consumer *cp, char *label, size_t size, int what)
   52 {
   53         struct g_provider *pp;
   54         int sb, superblock;
   55         struct fs *fs;
   56 
   57         g_topology_assert_not();
   58         pp = cp->provider;
   59         label[0] = '\0';
   60 
   61         if (SBLOCKSIZE % cp->provider->sectorsize != 0)
   62                 return;
   63 
   64         /*
   65          * Walk through the standard places that superblocks hide and look
   66          * for UFS magic. If we find magic, then check that the size in the
   67          * superblock corresponds to the size of the underlying provider.
   68          * Finally, look for a volume label and create an appropriate
   69          * provider based on that.
   70          */
   71         for (sb = 0; (superblock = superblocks[sb]) != -1; sb++) {
   72                 /*
   73                  * Take care not to issue an invalid I/O request. The offset of
   74                  * the superblock candidate must be multiples of the provider's
   75                  * sector size, otherwise an FFS can't exist on the provider
   76                  * anyway.
   77                  */
   78                 if (superblock % cp->provider->sectorsize != 0)
   79                         continue;
   80 
   81                 fs = (struct fs *)g_read_data(cp, superblock, SBLOCKSIZE, NULL);
   82                 if (fs == NULL)
   83                         continue;
   84                 /* Check for magic. We also need to check if file system size is equal
   85                  * to providers size, because sysinstall(8) used to bogusly put first
   86                  * partition at offset 0 instead of 16, and glabel/ufs would find file
   87                  * system on slice instead of partition.
   88                  */
   89                 if (fs->fs_magic == FS_UFS1_MAGIC && fs->fs_fsize > 0 &&
   90                     pp->mediasize / fs->fs_fsize == fs->fs_old_size) {
   91                         /* Valid UFS1. */
   92                 } else if (fs->fs_magic == FS_UFS2_MAGIC && fs->fs_fsize > 0 &&
   93                     ((pp->mediasize / fs->fs_fsize == fs->fs_size) ||
   94                     (pp->mediasize / fs->fs_fsize == fs->fs_providersize))) {
   95                         /* Valid UFS2. */
   96                 } else {
   97                         g_free(fs);
   98                         continue;
   99                 }
  100                 if (fs->fs_sblockloc != superblock || fs->fs_ncg < 1 ||
  101                     fs->fs_bsize < MINBSIZE ||
  102                     fs->fs_bsize < sizeof(struct fs)) {
  103                         g_free(fs);
  104                         continue;
  105                 }
  106                 G_LABEL_DEBUG(1, "%s file system detected on %s.",
  107                     fs->fs_magic == FS_UFS1_MAGIC ? "UFS1" : "UFS2", pp->name);
  108                 switch (what) {
  109                 case G_LABEL_UFS_VOLUME:
  110                         /* Check for volume label */
  111                         if (fs->fs_volname[0] == '\0') {
  112                                 g_free(fs);
  113                                 continue;
  114                         }
  115                         strlcpy(label, fs->fs_volname, size);
  116                         break;
  117                 case G_LABEL_UFS_ID:
  118                         if (fs->fs_id[0] == 0 && fs->fs_id[1] == 0) {
  119                                 g_free(fs);
  120                                 continue;
  121                         }
  122                         snprintf(label, size, "%08x%08x", fs->fs_id[0],
  123                             fs->fs_id[1]);
  124                         break;
  125                 }
  126                 g_free(fs);
  127                 break;
  128         }
  129 }
  130 
  131 static void
  132 g_label_ufs_volume_taste(struct g_consumer *cp, char *label, size_t size)
  133 {
  134 
  135         g_label_ufs_taste_common(cp, label, size, G_LABEL_UFS_VOLUME);
  136 }
  137 
  138 static void
  139 g_label_ufs_id_taste(struct g_consumer *cp, char *label, size_t size)
  140 {
  141 
  142         g_label_ufs_taste_common(cp, label, size, G_LABEL_UFS_ID);
  143 }
  144 
  145 struct g_label_desc g_label_ufs_volume = {
  146         .ld_taste = g_label_ufs_volume_taste,
  147         .ld_dir = G_LABEL_UFS_VOLUME_DIR,
  148         .ld_enabled = 1
  149 };
  150 
  151 struct g_label_desc g_label_ufs_id = {
  152         .ld_taste = g_label_ufs_id_taste,
  153         .ld_dir = G_LABEL_UFS_ID_DIR,
  154         .ld_enabled = 1
  155 };
  156 
  157 G_LABEL_INIT(ufsid, g_label_ufs_id, "Create device nodes for UFS file system IDs");
  158 G_LABEL_INIT(ufs, g_label_ufs_volume, "Create device nodes for UFS volume names");

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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