usr.sbin/fstyp/ufs.c

   1 /*-
   2  * Copyright (c) 2016 The DragonFly Project
   3  * Copyright (c) 2002, 2003 Gordon Tetlow
   4  * Copyright (c) 2006 Pawel Jakub Dawidek <pjd@FreeBSD.org>
   5  * Copyright (c) 2014 The FreeBSD Foundation
   6  * All rights reserved.
   7  *
   8  * This software was developed by Edward Tomasz Napierala under sponsorship
   9  * from the FreeBSD Foundation.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 #include <sys/types.h>
  34 #include <stdint.h>
  35 #include <stdio.h>
  36 #include <stdlib.h>
  37 #include <string.h>
  38
  39 typedef int64_t ufs_time_t;
  40 typedef int64_t ufs2_daddr_t;
  41 #include "../../sys/boot/common/fs.h"
  42
  43 #include "fstyp.h"
  44
  45 static const int superblocks[] = SBLOCKSEARCH;
  46
  47 int
  48 fstyp_ufs(FILE *fp, char *label, size_t labelsize)
  49 {
  50         int sb, superblock;
  51         struct fs *fs;
  52
  53         /*
  54          * Walk through the standard places that superblocks hide and look
  55          * for UFS magic. If we find magic, then check that the size in the
  56          * superblock corresponds to the size of the underlying provider.
  57          * Finally, look for a volume label and create an appropriate
  58          * provider based on that.
  59          */
  60         for (sb = 0; (superblock = superblocks[sb]) != -1; sb++) {
  61                 fs = (struct fs *)read_buf(fp, superblock, SBLOCKSIZE);
  62                 if (fs == NULL)
  63                         continue;
  64                 /*
  65                  * Check for magic. We also need to check if file system size is equal
  66                  * to providers size, because sysinstall(8) used to bogusly put first
  67                  * partition at offset 0 instead of 16, and glabel/ufs would find file
  68                  * system on slice instead of partition.
  69                  */
  70 #ifdef notyet
  71                 if (fs->fs_magic == FS_UFS1_MAGIC && fs->fs_fsize > 0 &&
  72                     ((pp->mediasize / fs->fs_fsize == fs->fs_old_size) ||
  73                     (pp->mediasize / fs->fs_fsize == fs->fs_providersize))) {
  74                         /* Valid UFS1. */
  75                 } else if (fs->fs_magic == FS_UFS2_MAGIC && fs->fs_fsize > 0 &&
  76                     ((pp->mediasize / fs->fs_fsize == fs->fs_size) ||
  77                     (pp->mediasize / fs->fs_fsize == fs->fs_providersize))) {
  78                         /* Valid UFS2. */
  79                 } else {
  80                         g_free(fs);
  81                         continue;
  82                 }
  83 #else
  84                 if (fs->fs_magic == FS_UFS1_MAGIC && fs->fs_fsize > 0) {
  85                         /* Valid UFS1. */
  86                 } else if (fs->fs_magic == FS_UFS2_MAGIC && fs->fs_fsize > 0) {
  87                         /* Valid UFS2. */
  88                 } else {
  89                         free(fs);
  90                         continue;
  91                 }
  92 #endif
  93                 /*
  94                  * XXX: DragonFly
  95                  */
  96                 if (/* fs->fs_sblockloc != superblock || */
  97                     fs->fs_ncg < 1 ||
  98                     fs->fs_bsize < MINBSIZE ||
  99                     (size_t)fs->fs_bsize < sizeof(struct fs)) {
 100                         free(fs);
 101                         continue;
 102                 }
 103
 104                 strlcpy(label, fs->fs_volname, labelsize);
 105
 106                 free(fs);
 107                 return (0);
 108         }
 109
 110         return (1);
 111 }