sbin/mount_hammer/mount_hammer.c

   1 /*
   2  * Copyright (c) 2007 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Matthew Dillon <dillon@backplane.com>
   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  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in
  15  *    the documentation and/or other materials provided with the
  16  *    distribution.
  17  * 3. Neither the name of The DragonFly Project nor the names of its
  18  *    contributors may be used to endorse or promote products derived
  19  *    from this software without specific, prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  31  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  * $DragonFly: src/sbin/mount_hammer/mount_hammer.c,v 1.7.2.1 2008/07/17 23:54:06 thomas Exp $
  35  */
  36
  37 #include <sys/types.h>
  38 #include <sys/diskslice.h>
  39 #include <sys/diskmbr.h>
  40 #include <sys/stat.h>
  41 #include <sys/time.h>
  42 #include <vfs/hammer/hammer_mount.h>
  43
  44 #include <stdio.h>
  45 #include <stdlib.h>
  46 #include <stdarg.h>
  47 #include <stddef.h>
  48 #include <unistd.h>
  49 #include <string.h>
  50 #include <errno.h>
  51 #include <fcntl.h>
  52 #include <uuid.h>
  53 #include <err.h>
  54 #include <assert.h>
  55 #include <ctype.h>
  56
  57 #include "mntopts.h"
  58
  59 typedef const char **ary_ptr_t;
  60
  61 static void extract_volumes(ary_ptr_t *aryp, int *countp, char **av, int ac);
  62
  63 #define MOPT_UPDATE         { "update",     0, MNT_UPDATE, 0 }
  64
  65 #define MOPT_HAMMEROPTS         \
  66         { "history", 1, HMNT_NOHISTORY, 1 }     \
  67
  68 static struct mntopt mopts[] = { MOPT_STDOPTS, MOPT_HAMMEROPTS,
  69                                  MOPT_UPDATE, MOPT_NULL };
  70
  71 static void usage(void);
  72
  73 int
  74 main(int ac, char **av)
  75 {
  76         struct hammer_mount_info info;
  77         struct vfsconf vfc;
  78         int mount_flags = 0;
  79         int error;
  80         int ch;
  81         int init_flags = 0;
  82         char *mountpt;
  83
  84         bzero(&info, sizeof(info));
  85         info.asof = 0;
  86         mount_flags = 0;
  87         info.hflags = 0;
  88
  89         while ((ch = getopt(ac, av, "o:T:u")) != -1) {
  90                 switch(ch) {
  91                 case 'T':
  92                         info.asof = strtoull(optarg, NULL, 0);
  93                         break;
  94                 case 'o':
  95                         getmntopts(optarg, mopts, &mount_flags, &info.hflags);
  96                         break;
  97                 case 'u':
  98                         init_flags |= MNT_UPDATE;
  99                         break;
 100                 default:
 101                         usage();
 102                         /* not reached */
 103                 }
 104         }
 105         ac -= optind;
 106         av += optind;
 107         mount_flags |= init_flags;
 108
 109         /*
 110          * Only the mount point need be specified in update mode.
 111          */
 112         if (init_flags & MNT_UPDATE) {
 113                 if (ac != 1) {
 114                         usage();
 115                         /* not reached */
 116                 }
 117                 mountpt = av[0];
 118                 if (mount(vfc.vfc_name, mountpt, mount_flags, &info))
 119                         err(1, NULL);
 120                 exit(0);
 121         }
 122
 123         if (ac < 2) {
 124                 usage();
 125                 /* not reached */
 126         }
 127
 128         /*
 129          * Mount arguments: vol [vol...] mountpt
 130          */
 131         extract_volumes(&info.volumes, &info.nvolumes, av, ac - 1);
 132         mountpt = av[ac - 1];
 133
 134         /*
 135          * Load the hammer module if necessary (this bit stolen from
 136          * mount_null).
 137          */
 138         error = getvfsbyname("hammer", &vfc);
 139         if (error && vfsisloadable("hammer")) {
 140                 if (vfsload("hammer") != 0)
 141                         err(1, "vfsload(hammer)");
 142                 endvfsent();
 143                 error = getvfsbyname("hammer", &vfc);
 144         }
 145         if (error)
 146                 errx(1, "hammer filesystem is not available");
 147
 148         if (mount(vfc.vfc_name, mountpt, mount_flags, &info))
 149                 err(1, NULL);
 150         exit(0);
 151 }
 152
 153 /*
 154  * Extract a volume list
 155  */
 156 static void
 157 extract_volumes(ary_ptr_t *aryp, int *countp, char **av, int ac)
 158 {
 159         int idx = 0;
 160         int arymax = 32;
 161         const char **ary = malloc(sizeof(char *) * 32);
 162         char *ptr;
 163         char *next;
 164
 165         while (ac) {
 166                 if (idx == arymax) {
 167                         arymax += 32;
 168                         ary = realloc(ary, sizeof(char *) * arymax);
 169                 }
 170                 if (strchr(*av, ':') == NULL) {
 171                         ary[idx++] = *av;
 172                 } else {
 173                         next = strdup(*av);
 174                         while ((ptr = next) != NULL) {
 175                                 if (idx == arymax) {
 176                                         arymax += 32;
 177                                         ary = realloc(ary, sizeof(char *) *
 178                                                       arymax);
 179                                 }
 180                                 if ((next = strchr(ptr, ':')) != NULL)
 181                                         *next++ = 0;
 182                                 ary[idx++] = ptr;
 183                         }
 184                 }
 185                 --ac;
 186                 ++av;
 187
 188         }
 189         *aryp = ary;
 190         *countp = idx;
 191 }
 192
 193 static
 194 void
 195 usage(void)
 196 {
 197         fprintf(stderr, "mount_hammer [-T transaction-id] [-o options] "
 198                         "special ... mount-point\n");
 199         fprintf(stderr, "mount_hammer -u [-o options] mount-point\n");
 200         exit(1);
 201 }