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 1.9 2008/07/19 18:48:15 dillon 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         { "master=", 0, HMNT_MASTERID, 1 },     \
  68         { "nomirror", 0, HMNT_MASTERID, 1 }
  69
  70 static struct mntopt mopts[] = { MOPT_STDOPTS, MOPT_HAMMEROPTS,
  71                                  MOPT_UPDATE, MOPT_NULL };
  72
  73 static void usage(void);
  74
  75 int
  76 main(int ac, char **av)
  77 {
  78         struct hammer_mount_info info;
  79         struct vfsconf vfc;
  80         int mount_flags = 0;
  81         int error;
  82         int ch;
  83         int init_flags = 0;
  84         char *mountpt;
  85         char *ptr;
  86
  87         bzero(&info, sizeof(info));
  88         info.asof = 0;
  89         mount_flags = 0;
  90         info.hflags = 0;
  91
  92         while ((ch = getopt(ac, av, "o:T:u")) != -1) {
  93                 switch(ch) {
  94                 case 'T':
  95                         info.asof = strtoull(optarg, NULL, 0);
  96                         break;
  97                 case 'o':
  98                         getmntopts(optarg, mopts, &mount_flags, &info.hflags);
  99
 100
 101                         /*
 102                          * Handle extended flags with parameters.
 103                          */
 104                         if (info.hflags & HMNT_MASTERID) {
 105                                 ptr = strstr(optarg, "master=");
 106                                 if (ptr) {
 107                                         info.master_id = strtol(ptr + 7, NULL, 0);
 108                                         if (info.master_id == 0) {
 109                                                 fprintf(stderr,
 110         "hammer_mount: Warning: a master id of 0 is the default, explicit\n"
 111         "settings should probably use 1-15\n");
 112                                         }
 113                                 }
 114                                 ptr = strstr(optarg, "nomirror");
 115                                 if (ptr)
 116                                         info.master_id = -1;
 117                         }
 118                         break;
 119                 case 'u':
 120                         init_flags |= MNT_UPDATE;
 121                         break;
 122                 default:
 123                         usage();
 124                         /* not reached */
 125                 }
 126         }
 127         ac -= optind;
 128         av += optind;
 129         mount_flags |= init_flags;
 130
 131         /*
 132          * Only the mount point need be specified in update mode.
 133          */
 134         if (init_flags & MNT_UPDATE) {
 135                 if (ac != 1) {
 136                         usage();
 137                         /* not reached */
 138                 }
 139                 mountpt = av[0];
 140                 if (mount(vfc.vfc_name, mountpt, mount_flags, &info))
 141                         err(1, NULL);
 142                 exit(0);
 143         }
 144
 145         if (ac < 2) {
 146                 usage();
 147                 /* not reached */
 148         }
 149
 150         /*
 151          * Mount arguments: vol [vol...] mountpt
 152          */
 153         extract_volumes(&info.volumes, &info.nvolumes, av, ac - 1);
 154         mountpt = av[ac - 1];
 155
 156         /*
 157          * Load the hammer module if necessary (this bit stolen from
 158          * mount_null).
 159          */
 160         error = getvfsbyname("hammer", &vfc);
 161         if (error && vfsisloadable("hammer")) {
 162                 if (vfsload("hammer") != 0)
 163                         err(1, "vfsload(hammer)");
 164                 endvfsent();
 165                 error = getvfsbyname("hammer", &vfc);
 166         }
 167         if (error)
 168                 errx(1, "hammer filesystem is not available");
 169
 170         if (mount(vfc.vfc_name, mountpt, mount_flags, &info))
 171                 err(1, NULL);
 172         exit(0);
 173 }
 174
 175 /*
 176  * Extract a volume list
 177  */
 178 static void
 179 extract_volumes(ary_ptr_t *aryp, int *countp, char **av, int ac)
 180 {
 181         int idx = 0;
 182         int arymax = 32;
 183         const char **ary = malloc(sizeof(char *) * 32);
 184         char *ptr;
 185         char *next;
 186
 187         while (ac) {
 188                 if (idx == arymax) {
 189                         arymax += 32;
 190                         ary = realloc(ary, sizeof(char *) * arymax);
 191                 }
 192                 if (strchr(*av, ':') == NULL) {
 193                         ary[idx++] = *av;
 194                 } else {
 195                         next = strdup(*av);
 196                         while ((ptr = next) != NULL) {
 197                                 if (idx == arymax) {
 198                                         arymax += 32;
 199                                         ary = realloc(ary, sizeof(char *) *
 200                                                       arymax);
 201                                 }
 202                                 if ((next = strchr(ptr, ':')) != NULL)
 203                                         *next++ = 0;
 204                                 ary[idx++] = ptr;
 205                         }
 206                 }
 207                 --ac;
 208                 ++av;
 209
 210         }
 211         *aryp = ary;
 212         *countp = idx;
 213 }
 214
 215 static
 216 void
 217 usage(void)
 218 {
 219         fprintf(stderr, "mount_hammer [-T transaction-id] [-o options] "
 220                         "special ... mount-point\n");
 221         fprintf(stderr, "mount_hammer -u [-o options] mount-point\n");
 222         exit(1);
 223 }