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,
  37           int raiddisks,
  38           mddev_dev_t devlist)
  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         int subdevs = 0;
  57         mddev_dev_t dv;
  58
  59         /* scan all devices, make sure they really are block devices */
  60         for (dv = devlist; dv; dv=dv->next) {
  61                 if (stat(dv->devname, &stb)) {
  62                         fprintf(stderr, Name ": Cannot find %s: %s\n",
  63                                 dv->devname, strerror(errno));
  64                         return 1;
  65                 }
  66                 if ((stb.st_mode & S_IFMT) != S_IFBLK) {
  67                         fprintf(stderr, Name ": %s is not a block device.\n",
  68                                 dv->devname);
  69                         return 1;
  70                 }
  71                 subdevs++;
  72         }
  73
  74         if (raiddisks != subdevs) {
  75                 fprintf(stderr, Name ": requested %d devices in array but listed %d\n",
  76                         raiddisks, subdevs);
  77                 return 1;
  78         }
  79
  80         vers = md_get_version(mdfd);
  81
  82         /* looks Ok, go for it */
  83         if (vers >= 9000) {
  84                 mdu_array_info_t array;
  85                 array.level = level;
  86                 array.size = 0;
  87                 array.nr_disks = raiddisks;
  88                 array.raid_disks = raiddisks;
  89                 array.md_minor = 0;
  90                 if (fstat(mdfd, &stb)==0)
  91                         array.md_minor = MINOR(stb.st_rdev);
  92                 array.not_persistent = 1;
  93                 array.state = 0; /* not clean, but no errors */
  94                 array.active_disks = raiddisks;
  95                 array.working_disks = raiddisks;
  96                 array.spare_disks = 0;
  97                 array.failed_disks = 0;
  98                 if (chunk == 0)
  99                         chunk = 64;
 100                 array.chunk_size = chunk*1024;
 101                 if (ioctl(mdfd, SET_ARRAY_INFO, &array)) {
 102                         fprintf(stderr, Name ": SET_ARRAY_INFO failed for %s: %s\n",
 103                                 mddev, strerror(errno));
 104                         return 1;
 105                 }
 106         }
 107         /* now add the devices */
 108         for ((i=0), (dv = devlist) ; dv ; i++, dv=dv->next) {
 109                 if (stat(dv->devname, &stb)) {
 110                         fprintf(stderr, Name ": Wierd: %s has disappeared.\n",
 111                                 dv->devname);
 112                         goto abort;
 113                 }
 114                 if ((stb.st_mode & S_IFMT)!= S_IFBLK) {
 115                         fprintf(stderr, Name ": Wierd: %s is no longer a block device.\n",
 116                                 dv->devname);
 117                         goto abort;
 118                 }
 119                 if (vers>= 9000) {
 120                         mdu_disk_info_t disk;
 121                         disk.number = i;
 122                         disk.raid_disk = i;
 123                         disk.state = 6;
 124                         disk.major = MAJOR(stb.st_rdev);
 125                         disk.minor = MINOR(stb.st_rdev);
 126                         if (ioctl(mdfd, ADD_NEW_DISK, &disk)) {
 127                                 fprintf(stderr, Name ": ADD_NEW_DISK failed for %s: %s\n",
 128                                         dv->devname, strerror(errno));
 129                                 goto abort;
 130                         }
 131                 } else {
 132                         if (ioctl(mdfd, REGISTER_DEV, &stb.st_rdev)) {
 133                                 fprintf(stderr, Name ": REGISTER_DEV failed for %s.\n",
 134                                         dv->devname, strerror(errno));
 135                                 goto abort;
 136                         }
 137                 }
 138         }
 139         /* now to start it */
 140         if (vers >= 9000) {
 141                 mdu_param_t param; /* not used by syscall */
 142                 if (ioctl(mdfd, RUN_ARRAY, &param)) {
 143                         fprintf(stderr, Name ": RUN_ARRAY failed: %s\n",
 144                                 strerror(errno));
 145                         goto abort;
 146                 }
 147         } else {
 148                 unsigned long arg;
 149                 arg=0;
 150                 while (chunk > 4096) {
 151                         arg++;
 152                         chunk >>= 1;
 153                 }
 154                 if (level == 0)
 155                         chunk |= 0x20000;
 156                 else    chunk |= 0x10000;
 157                 if (ioctl(mdfd, START_MD, arg)) {
 158                         fprintf(stderr, Name ": START_MD failed: %s\n",
 159                                 strerror(errno));
 160                         goto abort;
 161                 }
 162         }
 163         fprintf(stderr, Name ": array %s built and started.\n",
 164                 mddev);
 165         return 0;
 166
 167  abort:
 168         if (vers >= 9000)
 169             ioctl(mdfd, STOP_ARRAY, 0);
 170         else
 171             ioctl(mdfd, STOP_MD, 0);
 172         return 1;
 173
 174 }
 175