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 <strings.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         int error;
  59         int mount_flags;
  60
  61         bzero(&info, sizeof(info));
  62         mount_flags = 0;
  63
  64         if (argc < 3)
  65                 exit(1);
  66
  67         error = getvfsbyname("hammer2", &vfc);
  68         if (error) {
  69                 fprintf(stderr, "hammer2 vfs not loaded\n");
  70                 exit(1);
  71         }
  72
  73         /*
  74          * Connect to the cluster controller.  This handles both remote
  75          * mounts and device cache/master/slave mounts.
  76          *
  77          * When doing remote mounts that are allowed to run in the background
  78          * the mount program will fork, detach, print a message, and exit(0)
  79          * the originator while retrying in the background.
  80          */
  81         info.cluster_fd = cluster_connect(argv[1]);
  82         if (info.cluster_fd < 0) {
  83                 fprintf(stderr,
  84                         "hammer2_mount: cluster_connect(%s) failed\n",
  85                         argv[1]);
  86                 exit(1);
  87         }
  88
  89         /*
  90          * Try to mount it
  91          */
  92         info.volume = argv[1];
  93         info.hflags = 0;
  94         mountpt = argv[2];
  95
  96         error = mount(vfc.vfc_name, mountpt, mount_flags, &info);
  97         if (error < 0) {
  98                 if (errno == ERANGE) {
  99                         fprintf(stderr,
 100                                 "%s integrated with %s\n",
 101                                 info.volume, mountpt);
 102                 } else {
 103                         perror("mount: ");
 104                         exit(1);
 105                 }
 106         }
 107
 108         /*
 109          * XXX fork a backgrounded reconnector process to handle connection
 110          *     failures. XXX
 111          */
 112
 113         return (0);
 114 }
 115
 116 /*
 117  * Connect to the cluster controller.  We can connect to a local or remote
 118  * cluster controller, depending.  For a multi-node cluster we always want
 119  * to connect to the local controller and let it maintain the connections
 120  * to the multiple remote nodes.
 121  */
 122 static
 123 int
 124 cluster_connect(const char *volume __unused)
 125 {
 126         struct sockaddr_in lsin;
 127         int fd;
 128
 129         /*
 130          * This starts the hammer2 service if it isn't already running,
 131          * so we can connect to it.
 132          */
 133         system("/sbin/hammer2 -q service");
 134
 135         /*
 136          * Connect us to the service but leave the rest to the kernel.
 137          * If the connection is lost during the mount
 138          */
 139         if ((fd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
 140                 perror("socket");
 141                 return(-1);
 142         }
 143         bzero(&lsin, sizeof(lsin));
 144         lsin.sin_family = AF_INET;
 145         lsin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
 146         lsin.sin_port = htons(DMSG_LISTEN_PORT);
 147
 148         if (connect(fd, (struct sockaddr *)&lsin, sizeof(lsin)) < 0) {
 149                 close(fd);
 150                 fprintf(stderr, "mount_hammer2: unable to connect to "
 151                                 "cluster controller\n");
 152                 return(-1);
 153         }
 154
 155         return(fd);
 156 }