sbin/mount_hammer2/mount_hammer2.c

   1 /*
   2  * Copyright (c) 2011-2015 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Matthew Dillon <dillon@dragonflybsd.org>
   6  * by Venkatesh Srinivas <vsrinivas@dragonflybsd.org>
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in
  16  *    the documentation and/or other materials provided with the
  17  *    distribution.
  18  * 3. Neither the name of The DragonFly Project nor the names of its
  19  *    contributors may be used to endorse or promote products derived
  20  *    from this software without specific, prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  23  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  24  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  25  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  26  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  27  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  28  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  29  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  30  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  31  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  32  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35 #include <sys/types.h>
  36 #include <sys/mount.h>
  37 #include <sys/socket.h>
  38 #include <netinet/in.h>
  39 #include <vfs/hammer2/hammer2_mount.h>
  40
  41 #include <stdio.h>
  42 #include <stdlib.h>
  43 #include <stdarg.h>
  44 #include <string.h>
  45 #include <unistd.h>
  46 #include <errno.h>
  47 #include <dmsg.h>
  48 #include <mntopts.h>
  49
  50 static int cluster_connect(const char *volume);
  51 static void usage(const char *ctl, ...);
  52
  53 static struct mntopt mopts[] = {
  54         MOPT_STDOPTS,
  55         MOPT_UPDATE,
  56         { "local", 0, HMNT2_LOCAL, 1 },
  57         MOPT_NULL
  58 };
  59
  60 /*
  61  * Usage: mount_hammer2 [volume] [mtpt]
  62  */
  63 int
  64 main(int ac, char *av[])
  65 {
  66         struct hammer2_mount_info info;
  67         struct vfsconf vfc;
  68         char *mountpt;
  69         char *devpath;
  70         int error;
  71         int ch;
  72         int mount_flags;
  73         int init_flags;
  74
  75         bzero(&info, sizeof(info));
  76         mount_flags = 0;
  77         init_flags = 0;
  78
  79         while ((ch = getopt(ac, av, "o:u")) != -1) {
  80                 switch(ch) {
  81                 case 'o':
  82                         getmntopts(optarg, mopts, &mount_flags, &info.hflags);
  83                         break;
  84                 case 'u':
  85                         init_flags |= MNT_UPDATE;
  86                         break;
  87                 default:
  88                         usage("unknown option: -%c", ch);
  89                         /* not reached */
  90                 }
  91         }
  92         ac -= optind;
  93         av += optind;
  94         mount_flags |= init_flags;
  95
  96         error = getvfsbyname("hammer2", &vfc);
  97         if (error) {
  98                 fprintf(stderr, "hammer2 vfs not loaded\n");
  99                 exit(1);
 100         }
 101
 102         /*
 103          * Only the mount point need be specified in update mode.
 104          */
 105         if (init_flags & MNT_UPDATE) {
 106                 if (ac != 1) {
 107                         usage("missing parameter (node)");
 108                         /* not reached */
 109                 }
 110                 mountpt = av[0];
 111                 if (mount(vfc.vfc_name, mountpt, mount_flags, &info))
 112                         usage("mount %s: %s", mountpt, strerror(errno));
 113                 exit(0);
 114         }
 115
 116         /*
 117          * New mount
 118          */
 119         if (ac != 2) {
 120                 usage("missing parameter(s) (special[@label] node)");
 121                 /* not reached */
 122         }
 123
 124         devpath = strdup(av[0]);
 125         mountpt = av[1];
 126
 127         if (devpath[0] == 0) {
 128                 fprintf(stderr, "mount_hammer2: empty device path\n");
 129                 exit(1);
 130         }
 131
 132         /*
 133          * Automatically add @BOOT, @ROOT, or @DATA if no label specified,
 134          * based on the slice.
 135          */
 136         if (strchr(devpath, '@') == NULL) {
 137                 char slice = devpath[strlen(devpath)-1];
 138                 switch(slice) {
 139                 case 'a':
 140                         asprintf(&devpath, "%s@BOOT", devpath);
 141                         break;
 142                 case 'd':
 143                         asprintf(&devpath, "%s@ROOT", devpath);
 144                         break;
 145                 default:
 146                         asprintf(&devpath, "%s@DATA", devpath);
 147                         break;
 148                 }
 149         }
 150
 151         /*
 152          * Connect to the cluster controller.  This handles both remote
 153          * mounts and device cache/master/slave mounts.
 154          *
 155          * When doing remote mounts that are allowed to run in the background
 156          * the mount program will fork, detach, print a message, and exit(0)
 157          * the originator while retrying in the background.
 158          *
 159          * Don't exit on failure, this isn't likely going to work for
 160          * the root [re]mount in early boot.
 161          */
 162         info.cluster_fd = cluster_connect(devpath);
 163         if (info.cluster_fd < 0) {
 164                 fprintf(stderr,
 165                         "mount_hammer2: cluster_connect(%s) failed\n",
 166                         devpath);
 167         }
 168
 169         /*
 170          * Try to mount it, prefix if necessary.
 171          */
 172         if (!strchr(devpath, ':') && devpath[0] != '/' && devpath[0] != '@') {
 173                 char *p2;
 174                 asprintf(&p2, "/dev/%s", devpath);
 175                 free(devpath);
 176                 devpath = p2;
 177         }
 178         info.volume = devpath;
 179
 180         error = mount(vfc.vfc_name, mountpt, mount_flags, &info);
 181         if (error < 0) {
 182                 if (errno == ERANGE) {
 183                         fprintf(stderr,
 184                                 "mount_hammer2: %s integrated with %s\n",
 185                                 info.volume, mountpt);
 186                 } else if (errno == ENOENT) {
 187                         fprintf(stderr, "mount_hammer2: %s not found\n",
 188                                 info.volume);
 189                 } else if (errno == ENXIO) {
 190                         fprintf(stderr, "mount_hammer2: incorrect volume "
 191                                 "specification %s\n",
 192                                 info.volume);
 193                 } else {
 194                         perror("mount");
 195                 }
 196                 exit(1);
 197         }
 198         free(devpath);
 199
 200         /*
 201          * XXX fork a backgrounded reconnector process to handle connection
 202          *     failures.
 203          */
 204
 205         return (0);
 206 }
 207
 208 /*
 209  * Connect to the cluster controller.  We can connect to a local or remote
 210  * cluster controller, depending.  For a multi-node cluster we always want
 211  * to connect to the local controller and let it maintain the connections
 212  * to the multiple remote nodes.
 213  */
 214 static
 215 int
 216 cluster_connect(const char *volume __unused)
 217 {
 218         struct sockaddr_in lsin;
 219         int fd;
 220
 221         /*
 222          * This starts the hammer2 service if it isn't already running,
 223          * so we can connect to it.
 224          */
 225         system("/sbin/hammer2 -q service");
 226
 227         /*
 228          * Connect us to the service but leave the rest to the kernel.
 229          * If the connection is lost during the mount
 230          */
 231         if ((fd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
 232                 perror("socket");
 233                 return(-1);
 234         }
 235         bzero(&lsin, sizeof(lsin));
 236         lsin.sin_family = AF_INET;
 237         lsin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
 238         lsin.sin_port = htons(DMSG_LISTEN_PORT);
 239
 240         if (connect(fd, (struct sockaddr *)&lsin, sizeof(lsin)) < 0) {
 241                 close(fd);
 242                 fprintf(stderr, "mount_hammer2: unable to connect to "
 243                                 "cluster controller\n");
 244                 return(-1);
 245         }
 246
 247         return(fd);
 248 }
 249
 250 static
 251 void
 252 usage(const char *ctl, ...)
 253 {
 254         va_list va;
 255
 256         va_start(va, ctl);
 257         fprintf(stderr, "mount_hammer2: ");
 258         vfprintf(stderr, ctl, va);
 259         va_end(va);
 260         fprintf(stderr, "\n");
 261         fprintf(stderr, " mount_hammer2 [-o options] special[@label] node\n");
 262         fprintf(stderr, " mount_hammer2 [-o options] @label node\n");
 263         fprintf(stderr, " mount_hammer2 -u [-o options] node\n");
 264         fprintf(stderr, "\n");
 265         fprintf(stderr, "options:\n"
 266                         " <standard_mount_options>\n"
 267                         " local\t- disable PFS clustering for whole device\n"
 268         );
 269         exit(1);
 270 }