sbin/hammer/cmd_expand.c

   1 /*
   2  * Copyright (c) 2009 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> and
   6  * Michael Neumann <mneumann@ntecs.de>
   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  */
  36 /*
  37  * Expand a HAMMER filesystem.
  38  */
  39
  40 #include "hammer.h"
  41 #include <string.h>
  42
  43 static uint64_t check_volume(const char *vol_name);
  44 static void expand_usage(int exit_code);
  45
  46 /*
  47  * expand <filesystem> <device>
  48  */
  49 void
  50 hammer_cmd_expand(char **av, int ac)
  51 {
  52         struct hammer_ioc_expand expand;
  53         int fd;
  54
  55         if (ac != 2)
  56                 expand_usage(1);
  57         fd = open(av[0], O_RDONLY);
  58         if (fd < 0) {
  59                 fprintf(stderr, "hammer expand: unable to access %s: %s\n",
  60                         av[0], strerror(errno));
  61                 exit(1);
  62         }
  63
  64         /*
  65          * Expansion ioctl
  66          */
  67         bzero(&expand, sizeof(expand));
  68         strncpy(expand.device_name, av[1], MAXPATHLEN);
  69         expand.vol_size = check_volume(av[1]);
  70         expand.boot_area_size = HAMMER_BOOT_NOMBYTES;
  71         expand.mem_area_size = HAMMER_MEM_NOMBYTES;
  72
  73         if (ioctl(fd, HAMMERIOC_EXPAND, &expand) < 0) {
  74                 fprintf(stderr, "hammer expand ioctl: %s\n", strerror(errno));
  75                 exit(1);
  76         }
  77
  78         close(fd);
  79 }
  80
  81 static
  82 void
  83 expand_usage(int exit_code)
  84 {
  85         fprintf(stderr, "hammer expand <filesystem> <device>\n");
  86         exit(exit_code);
  87 }
  88
  89 /*
  90  * Check basic volume characteristics.  HAMMER filesystems use a minimum
  91  * of a 16KB filesystem buffer size.
  92  *
  93  * Returns the size of the device.
  94  *
  95  * From newfs_hammer.c
  96  */
  97 static
  98 uint64_t
  99 check_volume(const char *vol_name)
 100 {
 101         struct partinfo pinfo;
 102         int fd;
 103
 104         /*
 105          * Get basic information about the volume
 106          */
 107         fd = open(vol_name, O_RDWR);
 108         if (fd < 0)
 109                 errx(1, "Unable to open %s R+W", vol_name);
 110
 111         if (ioctl(fd, DIOCGPART, &pinfo) < 0) {
 112                 errx(1, "No block device: %s", vol_name);
 113         }
 114         /*
 115          * When formatting a block device as a HAMMER volume the
 116          * sector size must be compatible. HAMMER uses 16384 byte
 117          * filesystem buffers.
 118          */
 119         if (pinfo.reserved_blocks) {
 120                 errx(1, "HAMMER cannot be placed in a partition "
 121                         "which overlaps the disklabel or MBR");
 122         }
 123         if (pinfo.media_blksize > 16384 ||
 124             16384 % pinfo.media_blksize) {
 125                 errx(1, "A media sector size of %d is not supported",
 126                      pinfo.media_blksize);
 127         }
 128
 129         close(fd);
 130         return pinfo.media_size;
 131 }