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 1.6 2008/06/26 15:03:47 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         { "slave", 0, HMNT_SLAVE, 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                          * Handle extended flags with parameters.
 102                          */
 103                         if (info.hflags & HMNT_MASTERID) {
 104                                 ptr = strstr(optarg, "master=");
 105                                 assert(ptr);
 106                                 info.masterid = strtol(ptr + 7, NULL, 0);
 107                         }
 108
 109                         break;
 110                 case 'u':
 111                         init_flags |= MNT_UPDATE;
 112                         break;
 113                 default:
 114                         usage();
 115                         /* not reached */
 116                 }
 117         }
 118         ac -= optind;
 119         av += optind;
 120         mount_flags |= init_flags;
 121
 122         /*
 123          * Only the mount point need be specified in update mode.
 124          */
 125         if (init_flags & MNT_UPDATE) {
 126                 if (ac != 1) {
 127                         usage();
 128                         /* not reached */
 129                 }
 130                 mountpt = av[0];
 131                 if (mount(vfc.vfc_name, mountpt, mount_flags, &info))
 132                         err(1, NULL);
 133                 exit(0);
 134         }
 135
 136         if (ac < 2) {
 137                 usage();
 138                 /* not reached */
 139         }
 140
 141         /*
 142          * Mount arguments: vol [vol...] mountpt
 143          */
 144         extract_volumes(&info.volumes, &info.nvolumes, av, ac - 1);
 145         mountpt = av[ac - 1];
 146
 147         /*
 148          * Load the hammer module if necessary (this bit stolen from
 149          * mount_null).
 150          */
 151         error = getvfsbyname("hammer", &vfc);
 152         if (error && vfsisloadable("hammer")) {
 153                 if (vfsload("hammer") != 0)
 154                         err(1, "vfsload(hammer)");
 155                 endvfsent();
 156                 error = getvfsbyname("hammer", &vfc);
 157         }
 158         if (error)
 159                 errx(1, "hammer filesystem is not available");
 160
 161         if (mount(vfc.vfc_name, mountpt, mount_flags, &info))
 162                 err(1, NULL);
 163         exit(0);
 164 }
 165
 166 /*
 167  * Extract a volume list
 168  */
 169 static void
 170 extract_volumes(ary_ptr_t *aryp, int *countp, char **av, int ac)
 171 {
 172         int idx = 0;
 173         int arymax = 32;
 174         const char **ary = malloc(sizeof(char *) * 32);
 175         char *ptr;
 176         char *next;
 177
 178         while (ac) {
 179                 if (idx == arymax) {
 180                         arymax += 32;
 181                         ary = realloc(ary, sizeof(char *) * arymax);
 182                 }
 183                 if (strchr(*av, ':') == NULL) {
 184                         ary[idx++] = *av;
 185                 } else {
 186                         next = strdup(*av);
 187                         while ((ptr = next) != NULL) {
 188                                 if (idx == arymax) {
 189                                         arymax += 32;
 190                                         ary = realloc(ary, sizeof(char *) *
 191                                                       arymax);
 192                                 }
 193                                 if ((next = strchr(ptr, ':')) != NULL)
 194                                         *next++ = 0;
 195                                 ary[idx++] = ptr;
 196                         }
 197                 }
 198                 --ac;
 199                 ++av;
 200
 201         }
 202         *aryp = ary;
 203         *countp = idx;
 204 }
 205
 206 static
 207 void
 208 usage(void)
 209 {
 210         fprintf(stderr, "mount_hammer [-T time] [-o options] "
 211                         "volume [volume...] mount_pt");
 212         fprintf(stderr, "mount_hammer -u [-o options] mount_pt");
 213         fprintf(stderr, "    time: +n[s/m/h/D/M/Y]\n"
 214                         "    time: yyyymmdd[:hhmmss]\n");
 215         exit(1);
 216 }