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/param.h>
  37 #include <sys/mount.h>
  38 #include <sys/socket.h>
  39 #include <netinet/in.h>
  40 #include <vfs/hammer2/hammer2_mount.h>
  41
  42 #include <stdio.h>
  43 #include <stdlib.h>
  44 #include <stdarg.h>
  45 #include <string.h>
  46 #include <unistd.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         { "update", 0, MNT_UPDATE, 0 },
  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 (mountpoint)");
 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) (dev@LABEL mountpt)");
 121                 /* not reached */
 122         }
 123
 124         devpath = strdup(av[0]);
 125         mountpt = av[1];
 126
 127         if (strchr(devpath, '@') == NULL) {
 128                 fprintf(stderr,
 129                         "hammer2_mount: no @LABEL specified: \"%s\"\n"
 130                         "typical labels are @LOCAL, @ROOT\n",
 131                         devpath);
 132                 exit(1);
 133         }
 134
 135         /*
 136          * Connect to the cluster controller.  This handles both remote
 137          * mounts and device cache/master/slave mounts.
 138          *
 139          * When doing remote mounts that are allowed to run in the background
 140          * the mount program will fork, detach, print a message, and exit(0)
 141          * the originator while retrying in the background.
 142          */
 143         info.cluster_fd = cluster_connect(devpath);
 144         if (info.cluster_fd < 0) {
 145                 fprintf(stderr,
 146                         "hammer2_mount: cluster_connect(%s) failed\n",
 147                         devpath);
 148                 exit(1);
 149         }
 150
 151         /*
 152          * Try to mount it, prefix if necessary.
 153          */
 154         if (devpath[0] != '/') {
 155                 char *p2;
 156                 asprintf(&p2, "/dev/%s", devpath);
 157                 free(devpath);
 158                 devpath = p2;
 159         }
 160         info.volume = devpath;
 161
 162         error = mount(vfc.vfc_name, mountpt, mount_flags, &info);
 163         if (error < 0) {
 164                 if (errno == ERANGE) {
 165                         fprintf(stderr,
 166                                 "%s integrated with %s\n",
 167                                 info.volume, mountpt);
 168                 } else {
 169                         perror("mount: ");
 170                         exit(1);
 171                 }
 172         }
 173         free(devpath);
 174
 175         /*
 176          * XXX fork a backgrounded reconnector process to handle connection
 177          *     failures. XXX
 178          */
 179
 180         return (0);
 181 }
 182
 183 /*
 184  * Connect to the cluster controller.  We can connect to a local or remote
 185  * cluster controller, depending.  For a multi-node cluster we always want
 186  * to connect to the local controller and let it maintain the connections
 187  * to the multiple remote nodes.
 188  */
 189 static
 190 int
 191 cluster_connect(const char *volume __unused)
 192 {
 193         struct sockaddr_in lsin;
 194         int fd;
 195
 196         /*
 197          * This starts the hammer2 service if it isn't already running,
 198          * so we can connect to it.
 199          */
 200         system("/sbin/hammer2 -q service");
 201
 202         /*
 203          * Connect us to the service but leave the rest to the kernel.
 204          * If the connection is lost during the mount
 205          */
 206         if ((fd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
 207                 perror("socket");
 208                 return(-1);
 209         }
 210         bzero(&lsin, sizeof(lsin));
 211         lsin.sin_family = AF_INET;
 212         lsin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
 213         lsin.sin_port = htons(DMSG_LISTEN_PORT);
 214
 215         if (connect(fd, (struct sockaddr *)&lsin, sizeof(lsin)) < 0) {
 216                 close(fd);
 217                 fprintf(stderr, "mount_hammer2: unable to connect to "
 218                                 "cluster controller\n");
 219                 return(-1);
 220         }
 221
 222         return(fd);
 223 }
 224
 225 static
 226 void
 227 usage(const char *ctl, ...)
 228 {
 229         va_list va;
 230
 231         va_start(va, ctl);
 232         fprintf(stderr, "hammer2_mount: ");
 233         vfprintf(stderr, ctl, va);
 234         va_end(va);
 235         fprintf(stderr, "\n");
 236         fprintf(stderr, " hammer2_mount -u [-o opts] mountpt\n");
 237         fprintf(stderr, " hammer2_mount [-o opts] dev@LABEL mountpt\n");
 238         fprintf(stderr, "\n");
 239         fprintf(stderr, "options:\n"
 240                         " <standard_mount_opts>\n"
 241                         " local\t- disable PFS clustering for whole device\n"
 242         );
 243         exit(1);
 244 }