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           char *bitmap_file, int bitmap_chunk, int write_behind, int delay, int verbose)
  40 {
  41         /* Build a linear or raid0 arrays without superblocks
  42          * We cannot really do any checks, we just do it.
  43          * For md_version < 0.90.0, we call REGISTER_DEV
  44          * with the device numbers, and then
  45          * START_MD giving the "geometry"
  46          * geometry is 0xpp00cc
  47          * where pp is personality: 1==linear, 2=raid0
  48          * cc = chunk size factor: 0==4k, 1==8k etc.
  49          *
  50          * For md_version >= 0.90.0 we call
  51          * SET_ARRAY_INFO,  ADD_NEW_DISK, RUN_ARRAY
  52          *
  53          */
  54         int i;
  55         int vers;
  56         struct stat stb;
  57         int subdevs = 0, missing_disks = 0;
  58         mddev_dev_t dv;
  59         int bitmap_fd;
  60         unsigned long long size = ~0ULL;
  61
  62         /* scan all devices, make sure they really are block devices */
  63         for (dv = devlist; dv; dv=dv->next) {
  64                 subdevs++;
  65                 if (strcmp("missing", dv->devname) == 0) {
  66                         missing_disks++;
  67                         continue;
  68                 }
  69                 if (stat(dv->devname, &stb)) {
  70                         fprintf(stderr, Name ": Cannot find %s: %s\n",
  71                                 dv->devname, strerror(errno));
  72                         return 1;
  73                 }
  74                 if ((stb.st_mode & S_IFMT) != S_IFBLK) {
  75                         fprintf(stderr, Name ": %s is not a block device.\n",
  76                                 dv->devname);
  77                         return 1;
  78                 }
  79         }
  80
  81         if (raiddisks != subdevs) {
  82                 fprintf(stderr, Name ": requested %d devices in array but listed %d\n",
  83                         raiddisks, subdevs);
  84                 return 1;
  85         }
  86
  87         if (layout == UnSet)
  88                 switch(level) {
  89                 default: /* no layout */
  90                         layout = 0;
  91                         break;
  92                 case 10:
  93                         layout = 0x102; /* near=2, far=1 */
  94                         if (verbose > 0)
  95                                 fprintf(stderr,
  96                                         Name ": layout defaults to n1\n");
  97                         break;
  98                 case 5:
  99                 case 6:
 100                         layout = map_name(r5layout, "default");
 101                         if (verbose > 0)
 102                                 fprintf(stderr,
 103                                         Name ": layout defaults to %s\n", map_num(r5layout, layout));
 104                         break;
 105                 case LEVEL_FAULTY:
 106                         layout = map_name(faultylayout, "default");
 107
 108                         if (verbose > 0)
 109                                 fprintf(stderr,
 110                                         Name ": layout defaults to %s\n", map_num(faultylayout, layout));
 111                         break;
 112                 }
 113
 114
 115         vers = md_get_version(mdfd);
 116
 117         /* looks Ok, go for it */
 118         if (vers >= 9000) {
 119                 mdu_array_info_t array;
 120                 array.level = level;
 121                 array.size = 0;
 122                 array.nr_disks = raiddisks;
 123                 array.raid_disks = raiddisks;
 124                 array.md_minor = 0;
 125                 if (fstat(mdfd, &stb)==0)
 126                         array.md_minor = minor(stb.st_rdev);
 127                 array.not_persistent = 1;
 128                 array.state = 0; /* not clean, but no errors */
 129                 if (assume_clean)
 130                         array.state |= 1;
 131                 array.active_disks = raiddisks - missing_disks;
 132                 array.working_disks = raiddisks - missing_disks;
 133                 array.spare_disks = 0;
 134                 array.failed_disks = missing_disks;
 135                 if (chunk == 0 && (level==0 || level==LEVEL_LINEAR))
 136                         chunk = 64;
 137                 array.chunk_size = chunk*1024;
 138                 array.layout = layout;
 139                 if (ioctl(mdfd, SET_ARRAY_INFO, &array)) {
 140                         fprintf(stderr, Name ": SET_ARRAY_INFO failed for %s: %s\n",
 141                                 mddev, strerror(errno));
 142                         return 1;
 143                 }
 144         } else if (bitmap_file) {
 145                 fprintf(stderr, Name ": bitmaps not supported with this kernel\n");
 146                 return 1;
 147         }
 148         /* now add the devices */
 149         for ((i=0), (dv = devlist) ; dv ; i++, dv=dv->next) {
 150                 unsigned long dsize;
 151                 int fd;
 152                 if (strcmp("missing", dv->devname) == 0)
 153                         continue;
 154                 if (stat(dv->devname, &stb)) {
 155                         fprintf(stderr, Name ": Weird: %s has disappeared.\n",
 156                                 dv->devname);
 157                         goto abort;
 158                 }
 159                 if ((stb.st_mode & S_IFMT)!= S_IFBLK) {
 160                         fprintf(stderr, Name ": Wierd: %s is no longer a block device.\n",
 161                                 dv->devname);
 162                         goto abort;
 163                 }
 164                 fd = open(dv->devname, O_RDONLY|O_EXCL);
 165                 if (fd < 0) {
 166                         fprintf(stderr, Name ": Cannot open %s: %s\n",
 167                                 dv->devname, strerror(errno));
 168                         goto abort;
 169                 }
 170                 if (ioctl(fd, BLKGETSIZE, &dsize) == 0 && dsize > 0) {
 171                         unsigned long long ldsize = dsize;
 172                         ldsize <<= 9;
 173                         if (size== 0 || ldsize < size)
 174                                 size = ldsize;
 175                 }
 176                 close(fd);
 177                 if (vers>= 9000) {
 178                         mdu_disk_info_t disk;
 179                         disk.number = i;
 180                         disk.raid_disk = i;
 181                         disk.state = (1<<MD_DISK_SYNC) | (1<<MD_DISK_ACTIVE);
 182                         if (dv->writemostly)
 183                                 disk.state |= 1<<MD_DISK_WRITEMOSTLY;
 184                         disk.major = major(stb.st_rdev);
 185                         disk.minor = minor(stb.st_rdev);
 186                         if (ioctl(mdfd, ADD_NEW_DISK, &disk)) {
 187                                 fprintf(stderr, Name ": ADD_NEW_DISK failed for %s: %s\n",
 188                                         dv->devname, strerror(errno));
 189                                 goto abort;
 190                         }
 191                 } else {
 192                         if (ioctl(mdfd, REGISTER_DEV, &stb.st_rdev)) {
 193                                 fprintf(stderr, Name ": REGISTER_DEV failed for %s: %s.\n",
 194                                         dv->devname, strerror(errno));
 195                                 goto abort;
 196                         }
 197                 }
 198         }
 199         /* now to start it */
 200         if (vers >= 9000) {
 201                 mdu_param_t param; /* not used by syscall */
 202                 if (bitmap_file) {
 203                         bitmap_fd = open(bitmap_file, O_RDWR);
 204                         if (bitmap_fd < 0) {
 205                                 if (bitmap_chunk == UnSet) {
 206                                         fprintf(stderr, Name ": %s cannot be openned.",
 207                                                 bitmap_file);
 208                                         return 1;
 209                                 }
 210                                 if (CreateBitmap(bitmap_file, 1, NULL, bitmap_chunk,
 211                                                  delay, write_behind, size>>9)) {
 212                                         return 1;
 213                                 }
 214                                 bitmap_fd = open(bitmap_file, O_RDWR);
 215                                 if (bitmap_fd < 0) {
 216                                         fprintf(stderr, Name ": %s cannot be openned.",
 217                                                 bitmap_file);
 218                                         return 1;
 219                                 }
 220                         }
 221                         if (bitmap_fd >= 0) {
 222                                 if (ioctl(mdfd, SET_BITMAP_FILE, bitmap_fd) < 0) {
 223                                         fprintf(stderr, Name ": Cannot set bitmap file for %s: %s\n",
 224                                                 mddev, strerror(errno));
 225                                         return 1;
 226                                 }
 227                         }
 228                 }
 229                 if (ioctl(mdfd, RUN_ARRAY, &param)) {
 230                         fprintf(stderr, Name ": RUN_ARRAY failed: %s\n",
 231                                 strerror(errno));
 232                         goto abort;
 233                 }
 234         } else {
 235                 unsigned long arg;
 236                 arg=0;
 237                 while (chunk > 4096) {
 238                         arg++;
 239                         chunk >>= 1;
 240                 }
 241                 if (level == 0)
 242                         chunk |= 0x20000;
 243                 else    chunk |= 0x10000;
 244                 if (ioctl(mdfd, START_MD, arg)) {
 245                         fprintf(stderr, Name ": START_MD failed: %s\n",
 246                                 strerror(errno));
 247                         goto abort;
 248                 }
 249         }
 250         if (verbose >= 0)
 251                 fprintf(stderr, Name ": array %s built and started.\n",
 252                         mddev);
 253         return 0;
 254
 255  abort:
 256         if (vers >= 9000)
 257             ioctl(mdfd, STOP_ARRAY, 0);
 258         else
 259             ioctl(mdfd, STOP_MD, 0);
 260         return 1;
 261
 262 }