Build.c

   1 /*
   2  * mdadm - manage Linux "md" devices aka RAID arrays.
   3  *
   4  * Copyright (C) 2001-2002 Neil Brown <neilb@cse.unsw.edu.au>
   5  *
   6  *
   7  *    This program is free software; you can redistribute it and/or modify
   8  *    it under the terms of the GNU General Public License as published by
   9  *    the Free Software Foundation; either version 2 of the License, or
  10  *    (at your option) any later version.
  11  *
  12  *    This program is distributed in the hope that it will be useful,
  13  *    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *    GNU General Public License for more details.
  16  *
  17  *    You should have received a copy of the GNU General Public License
  18  *    along with this program; if not, write to the Free Software
  19  *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  *
  21  *    Author: Neil Brown
  22  *    Email: <neilb@cse.unsw.edu.au>
  23  *    Paper: Neil Brown
  24  *           School of Computer Science and Engineering
  25  *           The University of New South Wales
  26  *           Sydney, 2052
  27  *           Australia
  28  */
  29
  30 #include "mdadm.h"
  31
  32 #define REGISTER_DEV            _IO (MD_MAJOR, 1)
  33 #define START_MD                _IO (MD_MAJOR, 2)
  34 #define STOP_MD                 _IO (MD_MAJOR, 3)
  35
  36 int Build(char *mddev, int mdfd, int chunk, int level, int layout,
  37           int raiddisks,
  38           mddev_dev_t devlist, int assume_clean)
  39 {
  40         /* Build a linear or raid0 arrays without superblocks
  41          * We cannot really do any checks, we just do it.
  42          * For md_version < 0.90.0, we call REGISTER_DEV
  43          * with the device numbers, and then
  44          * START_MD giving the "geometry"
  45          * geometry is 0xpp00cc
  46          * where pp is personality: 1==linear, 2=raid0
  47          * cc = chunk size factor: 0==4k, 1==8k etc.
  48          *
  49          * For md_version >= 0.90.0 we call
  50          * SET_ARRAY_INFO,  ADD_NEW_DISK, RUN_ARRAY
  51          *
  52          */
  53         int verbose = 0;
  54         int i;
  55         int vers;
  56         struct stat stb;
  57         int subdevs = 0;
  58         mddev_dev_t dv;
  59
  60         /* scan all devices, make sure they really are block devices */
  61         for (dv = devlist; dv; dv=dv->next) {
  62                 if (stat(dv->devname, &stb)) {
  63                         fprintf(stderr, Name ": Cannot find %s: %s\n",
  64                                 dv->devname, strerror(errno));
  65                         return 1;
  66                 }
  67                 if ((stb.st_mode & S_IFMT) != S_IFBLK) {
  68                         fprintf(stderr, Name ": %s is not a block device.\n",
  69                                 dv->devname);
  70                         return 1;
  71                 }
  72                 subdevs++;
  73         }
  74
  75         if (raiddisks != subdevs) {
  76                 fprintf(stderr, Name ": requested %d devices in array but listed %d\n",
  77                         raiddisks, subdevs);
  78                 return 1;
  79         }
  80
  81         if (layout == UnSet)
  82                 switch(level) {
  83                 default: /* no layout */
  84                         layout = 0;
  85                         break;
  86                 case 10:
  87                         layout = 0x102; /* near=2, far=1 */
  88                         if (verbose)
  89                                 fprintf(stderr,
  90                                         Name ": layout defaults to n1\n");
  91                         break;
  92                 case 5:
  93                 case 6:
  94                         layout = map_name(r5layout, "default");
  95                         if (verbose)
  96                                 fprintf(stderr,
  97                                         Name ": layout defaults to %s\n", map_num(r5layout, layout));
  98                         break;
  99                 case LEVEL_FAULTY:
 100                         layout = map_name(faultylayout, "default");
 101
 102                         if (verbose)
 103                                 fprintf(stderr,
 104                                         Name ": layout defaults to %s\n", map_num(faultylayout, layout));
 105                         break;
 106                 }
 107
 108
 109         vers = md_get_version(mdfd);
 110
 111         /* looks Ok, go for it */
 112         if (vers >= 9000) {
 113                 mdu_array_info_t array;
 114                 array.level = level;
 115                 array.size = 0;
 116                 array.nr_disks = raiddisks;
 117                 array.raid_disks = raiddisks;
 118                 array.md_minor = 0;
 119                 if (fstat(mdfd, &stb)==0)
 120                         array.md_minor = minor(stb.st_rdev);
 121                 array.not_persistent = 1;
 122                 array.state = 0; /* not clean, but no errors */
 123                 if (assume_clean)
 124                         array.state |= 1;
 125                 array.active_disks = raiddisks;
 126                 array.working_disks = raiddisks;
 127                 array.spare_disks = 0;
 128                 array.failed_disks = 0;
 129                 if (chunk == 0)
 130                         chunk = 64;
 131                 array.chunk_size = chunk*1024;
 132                 array.layout = layout;
 133                 if (ioctl(mdfd, SET_ARRAY_INFO, &array)) {
 134                         fprintf(stderr, Name ": SET_ARRAY_INFO failed for %s: %s\n",
 135                                 mddev, strerror(errno));
 136                         return 1;
 137                 }
 138         }
 139         /* now add the devices */
 140         for ((i=0), (dv = devlist) ; dv ; i++, dv=dv->next) {
 141                 if (stat(dv->devname, &stb)) {
 142                         fprintf(stderr, Name ": Wierd: %s has disappeared.\n",
 143                                 dv->devname);
 144                         goto abort;
 145                 }
 146                 if ((stb.st_mode & S_IFMT)!= S_IFBLK) {
 147                         fprintf(stderr, Name ": Wierd: %s is no longer a block device.\n",
 148                                 dv->devname);
 149                         goto abort;
 150                 }
 151                 if (vers>= 9000) {
 152                         mdu_disk_info_t disk;
 153                         disk.number = i;
 154                         disk.raid_disk = i;
 155                         disk.state = 6;
 156                         disk.major = major(stb.st_rdev);
 157                         disk.minor = minor(stb.st_rdev);
 158                         if (ioctl(mdfd, ADD_NEW_DISK, &disk)) {
 159                                 fprintf(stderr, Name ": ADD_NEW_DISK failed for %s: %s\n",
 160                                         dv->devname, strerror(errno));
 161                                 goto abort;
 162                         }
 163                 } else {
 164                         if (ioctl(mdfd, REGISTER_DEV, &stb.st_rdev)) {
 165                                 fprintf(stderr, Name ": REGISTER_DEV failed for %s: %s.\n",
 166                                         dv->devname, strerror(errno));
 167                                 goto abort;
 168                         }
 169                 }
 170         }
 171         /* now to start it */
 172         if (vers >= 9000) {
 173                 mdu_param_t param; /* not used by syscall */
 174                 if (ioctl(mdfd, RUN_ARRAY, &param)) {
 175                         fprintf(stderr, Name ": RUN_ARRAY failed: %s\n",
 176                                 strerror(errno));
 177                         goto abort;
 178                 }
 179         } else {
 180                 unsigned long arg;
 181                 arg=0;
 182                 while (chunk > 4096) {
 183                         arg++;
 184                         chunk >>= 1;
 185                 }
 186                 if (level == 0)
 187                         chunk |= 0x20000;
 188                 else    chunk |= 0x10000;
 189                 if (ioctl(mdfd, START_MD, arg)) {
 190                         fprintf(stderr, Name ": START_MD failed: %s\n",
 191                                 strerror(errno));
 192                         goto abort;
 193                 }
 194         }
 195         fprintf(stderr, Name ": array %s built and started.\n",
 196                 mddev);
 197         return 0;
 198
 199  abort:
 200         if (vers >= 9000)
 201             ioctl(mdfd, STOP_ARRAY, 0);
 202         else
 203             ioctl(mdfd, STOP_MD, 0);
 204         return 1;
 205
 206 }
 207