Build.c

   1 /*
   2  * mdctl - manage Linux "md" devices aka RAID arrays.
   3  *
   4  * Copyright (C) 2001 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 "mdctl.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,
  37           int raiddisks,
  38           int subdevs, char *subdev[])
  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 i;
  54         int vers;
  55         struct stat stb;
  56         if (raiddisks != subdevs) {
  57                 fprintf(stderr, Name ": requested %d devices in array but listed %d\n",
  58                         raiddisks, subdevs);
  59                 return 1;
  60         }
  61
  62         /* scan all devices, make sure they really are block devices */
  63         for (i=0; i<subdevs; i++) {
  64                 if (stat(subdev[i], &stb)) {
  65                         fprintf(stderr, Name ": Cannot find %s: %s\n",
  66                                 subdev[i], strerror(errno));
  67                         return 1;
  68                 }
  69                 if ((stb.st_mode & S_IFMT) != S_IFBLK) {
  70                         fprintf(stderr, Name ": %s is not a block device.\n",
  71                                 subdev[i]);
  72                         return 1;
  73                 }
  74         }
  75
  76         vers = md_get_version(mdfd);
  77
  78         /* looks Ok, go for it */
  79         if (vers >= 90000) {
  80                 mdu_array_info_t array;
  81                 array.level = level;
  82                 array.size = 0;
  83                 array.nr_disks = raiddisks;
  84                 array.raid_disks = raiddisks;
  85                 array.md_minor = 0;
  86                 if (fstat(mdfd, &stb)==0)
  87                         array.md_minor = MINOR(stb.st_rdev);
  88                 array.not_persistent = 0;
  89                 array.state = 0; /* not clean, but no errors */
  90                 array.active_disks = raiddisks;
  91                 array.working_disks = raiddisks;
  92                 array.spare_disks = 0;
  93                 array.failed_disks = 0;
  94                 array.chunk_size = chunk*1024;
  95                 if (ioctl(mdfd, SET_ARRAY_INFO, &array)) {
  96                         fprintf(stderr, Name ": SET_ARRAY_INFO failed for %s: %s\n",
  97                                 mddev, strerror(errno));
  98                         return 1;
  99                 }
 100         }
 101         /* now add the devices */
 102         for (i=0; i<subdevs; i++) {
 103                 if (stat(subdev[i], &stb)) {
 104                         fprintf(stderr, Name ": Wierd: %s has disappeared.\n",
 105                                 subdev[i]);
 106                         goto abort;
 107                 }
 108                 if ((stb.st_rdev & S_IFMT)!= S_IFBLK) {
 109                         fprintf(stderr, Name ": Wierd: %s is no longer a block device.\n",
 110                                 subdev[i]);
 111                         goto abort;
 112                 }
 113                 if (vers> 90000) {
 114                         mdu_disk_info_t disk;
 115                         disk.number = i;
 116                         disk.raid_disk = i;
 117                         disk.state = 6;
 118                         disk.major = MAJOR(stb.st_rdev);
 119                         disk.minor = MINOR(stb.st_rdev);
 120                         if (ioctl(mdfd, ADD_NEW_DISK, &disk)) {
 121                                 fprintf(stderr, Name ": ADD_NEW_DISK failed for %s: %s\n",
 122                                         subdev[i], strerror(errno));
 123                                 goto abort;
 124                         }
 125                 } else {
 126                         if (ioctl(mdfd, REGISTER_DEV, &stb.st_rdev)) {
 127                                 fprintf(stderr, Name ": REGISTER_DEV failed for %s.\n",
 128                                         subdev[i], strerror(errno));
 129                                 goto abort;
 130                         }
 131                 }
 132         }
 133         /* now to start it */
 134         if (vers > 90000) {
 135                 mdu_param_t param; /* not used by syscall */
 136                 if (ioctl(mdfd, RUN_ARRAY, param)) {
 137                         fprintf(stderr, Name ": RUN_ARRAY failed: %s\n",
 138                                 strerror(errno));
 139                         goto abort;
 140                 }
 141         } else {
 142                 int arg;
 143                 arg=0;
 144                 while (chunk > 4096) {
 145                         arg++;
 146                         chunk >>= 1;
 147                 }
 148                 if (level == 0)
 149                         chunk |= 0x20000;
 150                 else    chunk |= 0x10000;
 151                 if (ioctl(mdfd, START_MD, arg)) {
 152                         fprintf(stderr, Name ": START_MD failed: %s\n",
 153                                 strerror(errno));
 154                         goto abort;
 155                 }
 156         }
 157         fprintf(stderr, Name ": array %s built and started.\n",
 158                 mddev);
 159         return 0;
 160
 161  abort:
 162         if (vers > 900000)
 163             ioctl(mdfd, STOP_ARRAY, 0);
 164         else
 165             ioctl(mdfd, STOP_MD, 0);
 166         return 1;
 167
 168 }
 169