sbin/mount_hammer2/mount_hammer2.c

   1 /*
   2  * Copyright (c) 2011-2012 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 <string.h>
  44 #include <unistd.h>
  45 #include <dmsg.h>
  46
  47 static int cluster_connect(const char *volume);
  48
  49 /*
  50  * Usage: mount_hammer2 [volume] [mtpt]
  51  */
  52 int
  53 main(int argc, char *argv[])
  54 {
  55         struct hammer2_mount_info info;
  56         struct vfsconf vfc;
  57         char *mountpt;
  58         char *devpath;
  59         int error;
  60         int mount_flags;
  61
  62         bzero(&info, sizeof(info));
  63         mount_flags = 0;
  64
  65         if (argc < 3)
  66                 exit(1);
  67
  68         error = getvfsbyname("hammer2", &vfc);
  69         if (error) {
  70                 fprintf(stderr, "hammer2 vfs not loaded\n");
  71                 exit(1);
  72         }
  73
  74         devpath = strdup(argv[1]);
  75
  76         if (strchr(devpath, '@') == NULL) {
  77                 fprintf(stderr,
  78                         "hammer2_mount: no @LABEL specified: \"%s\"\n"
  79                         "typical labels are @BOOT, @ROOT, and @DATA\n",
  80                         devpath);
  81                 exit(1);
  82         }
  83
  84         /*
  85          * Connect to the cluster controller.  This handles both remote
  86          * mounts and device cache/master/slave mounts.
  87          *
  88          * When doing remote mounts that are allowed to run in the background
  89          * the mount program will fork, detach, print a message, and exit(0)
  90          * the originator while retrying in the background.
  91          */
  92         info.cluster_fd = cluster_connect(devpath);
  93         if (info.cluster_fd < 0) {
  94                 fprintf(stderr,
  95                         "hammer2_mount: cluster_connect(%s) failed\n",
  96                         devpath);
  97                 exit(1);
  98         }
  99
 100         /*
 101          * Try to mount it, prefix if necessary.
 102          */
 103         if (devpath[0] != '/') {
 104                 char *p2;
 105                 asprintf(&p2, "/dev/%s", devpath);
 106                 free(devpath);
 107                 devpath = p2;
 108         }
 109         info.volume = devpath;
 110         info.hflags = 0;
 111         mountpt = argv[2];
 112
 113         error = mount(vfc.vfc_name, mountpt, mount_flags, &info);
 114         if (error < 0) {
 115                 if (errno == ERANGE) {
 116                         fprintf(stderr,
 117                                 "%s integrated with %s\n",
 118                                 info.volume, mountpt);
 119                 } else {
 120                         perror("mount: ");
 121                         exit(1);
 122                 }
 123         }
 124         free(devpath);
 125
 126         /*
 127          * XXX fork a backgrounded reconnector process to handle connection
 128          *     failures. XXX
 129          */
 130
 131         return (0);
 132 }
 133
 134 /*
 135  * Connect to the cluster controller.  We can connect to a local or remote
 136  * cluster controller, depending.  For a multi-node cluster we always want
 137  * to connect to the local controller and let it maintain the connections
 138  * to the multiple remote nodes.
 139  */
 140 static
 141 int
 142 cluster_connect(const char *volume __unused)
 143 {
 144         struct sockaddr_in lsin;
 145         int fd;
 146
 147         /*
 148          * This starts the hammer2 service if it isn't already running,
 149          * so we can connect to it.
 150          */
 151         system("/sbin/hammer2 -q service");
 152
 153         /*
 154          * Connect us to the service but leave the rest to the kernel.
 155          * If the connection is lost during the mount
 156          */
 157         if ((fd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
 158                 perror("socket");
 159                 return(-1);
 160         }
 161         bzero(&lsin, sizeof(lsin));
 162         lsin.sin_family = AF_INET;
 163         lsin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
 164         lsin.sin_port = htons(DMSG_LISTEN_PORT);
 165
 166         if (connect(fd, (struct sockaddr *)&lsin, sizeof(lsin)) < 0) {
 167                 close(fd);
 168                 fprintf(stderr, "mount_hammer2: unable to connect to "
 169                                 "cluster controller\n");
 170                 return(-1);
 171         }
 172
 173         return(fd);
 174 }