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
  35 #include <sys/types.h>
  36 #include <sys/stat.h>
  37 #include <sys/syslimits.h>
  38 #include <vfs/hammer/hammer_mount.h>
  39 #include <vfs/hammer/hammer_disk.h>
  40
  41 #include <stdio.h>
  42 #include <stdlib.h>
  43 #include <stdarg.h>
  44 #include <stddef.h>
  45 #include <unistd.h>
  46 #include <string.h>
  47 #include <fcntl.h>
  48 #include <err.h>
  49 #include <mntopts.h>
  50
  51 static void extract_volumes(struct hammer_mount_info *info, char **av, int ac);
  52 static void free_volumes(struct hammer_mount_info *info);
  53 static void test_volumes(struct hammer_mount_info *info);
  54 static void usage(void);
  55
  56 #define MOPT_HAMMEROPTS         \
  57         { "history", 1, HMNT_NOHISTORY, 1 },    \
  58         { "master=", 0, HMNT_MASTERID, 1 },     \
  59         { "mirror", 1, HMNT_NOMIRROR, 1 }
  60
  61 static struct mntopt mopts[] = { MOPT_STDOPTS, MOPT_HAMMEROPTS,
  62                                  MOPT_UPDATE, MOPT_NULL };
  63
  64 int
  65 main(int ac, char **av)
  66 {
  67         struct hammer_mount_info info;
  68         struct vfsconf vfc;
  69         int mount_flags = 0;
  70         int init_flags = 0;
  71         int error;
  72         int ch;
  73         char *mountpt;
  74         char *ptr;
  75
  76         bzero(&info, sizeof(info));
  77
  78         while ((ch = getopt(ac, av, "o:T:u")) != -1) {
  79                 switch(ch) {
  80                 case 'T':
  81                         info.asof = strtoull(optarg, NULL, 0);
  82                         break;
  83                 case 'o':
  84                         getmntopts(optarg, mopts, &mount_flags, &info.hflags);
  85
  86                         /*
  87                          * Handle extended flags with parameters.
  88                          */
  89                         if (info.hflags & HMNT_MASTERID) {
  90                                 ptr = strstr(optarg, "master=");
  91                                 if (ptr) {
  92                                         info.master_id = strtol(ptr + 7, NULL, 0);
  93                                         if (info.master_id == 0) {
  94                                                 fprintf(stderr,
  95         "mount_hammer: Warning: a master id of 0 is the default, explicit\n"
  96         "settings should probably use 1-15\n");
  97                                         }
  98                                 }
  99                         }
 100                         if (info.hflags & HMNT_NOMIRROR) {
 101                                 ptr = strstr(optarg, "nomirror");
 102                                 if (ptr)
 103                                         info.master_id = -1;
 104                         }
 105                         break;
 106                 case 'u':
 107                         init_flags |= MNT_UPDATE;
 108                         break;
 109                 default:
 110                         usage();
 111                         /* not reached */
 112                 }
 113         }
 114         ac -= optind;
 115         av += optind;
 116         mount_flags |= init_flags;
 117
 118         /*
 119          * Only the mount point need be specified in update mode.
 120          */
 121         if (init_flags & MNT_UPDATE) {
 122                 if (ac != 1) {
 123                         usage();
 124                         /* not reached */
 125                 }
 126                 mountpt = av[0];
 127                 if (mount(vfc.vfc_name, mountpt, mount_flags, &info))
 128                         err(1, "mountpoint %s", mountpt);
 129                 exit(0);
 130         }
 131
 132         if (ac < 2) {
 133                 usage();
 134                 /* not reached */
 135         }
 136
 137         /*
 138          * Mount arguments: vol [vol...] mountpt
 139          */
 140         extract_volumes(&info, av, ac - 1);
 141         mountpt = av[ac - 1];
 142
 143         /*
 144          * Load the hammer module if necessary (this bit stolen from
 145          * mount_null).
 146          */
 147         error = getvfsbyname("hammer", &vfc);
 148         if (error && vfsisloadable("hammer")) {
 149                 if (vfsload("hammer") != 0)
 150                         err(1, "vfsload(hammer)");
 151                 endvfsent();
 152                 error = getvfsbyname("hammer", &vfc);
 153         }
 154         if (error)
 155                 errx(1, "hammer filesystem is not available");
 156
 157         if (mount(vfc.vfc_name, mountpt, mount_flags, &info)) {
 158                 perror("mount");
 159                 test_volumes(&info);
 160                 exit(1);
 161         }
 162         free_volumes(&info);
 163         exit(0);
 164 }
 165
 166 /*
 167  * Extract a volume list
 168  */
 169 static
 170 void
 171 extract_volumes(struct hammer_mount_info *info, char **av, int ac)
 172 {
 173         int idx = 0;
 174         int arymax = 32;
 175         char **ary = malloc(sizeof(char *) * arymax);
 176         char *ptr;
 177         char *next;
 178         char *orig;
 179
 180         while (ac) {
 181                 if (idx == arymax) {
 182                         arymax += 32;
 183                         ary = realloc(ary, sizeof(char *) * arymax);
 184                 }
 185                 if (strchr(*av, ':') == NULL) {
 186                         ary[idx++] = strdup(*av);
 187                 } else {
 188                         orig = next = strdup(*av);
 189                         while ((ptr = next) != NULL) {
 190                                 if (idx == arymax) {
 191                                         arymax += 32;
 192                                         ary = realloc(ary, sizeof(char *) *
 193                                                       arymax);
 194                                 }
 195                                 if ((next = strchr(ptr, ':')) != NULL)
 196                                         *next++ = 0;
 197                                 ary[idx++] = strdup(ptr);
 198                         }
 199                         free(orig);
 200                 }
 201                 --ac;
 202                 ++av;
 203         }
 204         info->nvolumes = idx;
 205         info->volumes = ary;
 206 }
 207
 208 static
 209 void
 210 free_volumes(struct hammer_mount_info *info)
 211 {
 212         int i;
 213
 214         for (i = 0; i < info->nvolumes; i++)
 215                 free(info->volumes[i]);
 216         free(info->volumes);
 217 }
 218
 219 static
 220 void
 221 test_volumes(struct hammer_mount_info *info)
 222 {
 223         int i, fd, ret;
 224         const char *vol;
 225         char buf[HAMMER_BUFSIZE];
 226         hammer_volume_ondisk_t ondisk;
 227
 228         for (i = 0; i < info->nvolumes; i++) {
 229                 vol = info->volumes[i];
 230                 fd = open(vol, O_RDONLY);
 231                 if (fd < 0) {
 232                         fprintf(stderr, "%s: Failed to open\n", vol);
 233                         goto next;
 234                 }
 235
 236                 bzero(buf, HAMMER_BUFSIZE);
 237                 ret = pread(fd, buf, HAMMER_BUFSIZE, 0);
 238                 if (ret != HAMMER_BUFSIZE) {
 239                         fprintf(stderr,
 240                                 "%s: Failed to read volume header\n", vol);
 241                         goto next;
 242                 }
 243
 244                 ondisk = (hammer_volume_ondisk_t)buf;
 245                 if (ondisk->vol_signature != HAMMER_FSBUF_VOLUME) {
 246                         fprintf(stderr,
 247                                 "%s: Not a valid HAMMER filesystem\n", vol);
 248                         goto next;
 249                 }
 250                 if (ondisk->vol_count != info->nvolumes) {
 251                         fprintf(stderr,
 252                                 "%s: Volume header says %d volumes\n",
 253                                 vol, ondisk->vol_count);
 254                         goto next;
 255                 }
 256 next:
 257                 close(fd);
 258         }
 259 }
 260
 261 static
 262 void
 263 usage(void)
 264 {
 265         fprintf(stderr, "usage: mount_hammer [-o options] [-T transaction-id] "
 266                         "special ... node\n");
 267         fprintf(stderr, "       mount_hammer [-o options] [-T transaction-id] "
 268                         "special[:special]* node\n");
 269         fprintf(stderr, "       mount_hammer -u [-o options] node\n");
 270         exit(1);
 271 }