Build.c

   1 /*
   2  * mdadm - manage Linux "md" devices aka RAID arrays.
   3  *
   4  * Copyright (C) 2001-2006 Neil Brown <neilb@suse.de>
   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 chunk, int level, int layout,
  37           int raiddisks, mddev_dev_t devlist, int assume_clean,
  38           char *bitmap_file, int bitmap_chunk, int write_behind,
  39           int delay, int verbose, int autof)
  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         unsigned long long bitmapsize;
  62         int mdfd;
  63
  64         /* scan all devices, make sure they really are block devices */
  65         for (dv = devlist; dv; dv=dv->next) {
  66                 subdevs++;
  67                 if (strcmp("missing", dv->devname) == 0) {
  68                         missing_disks++;
  69                         continue;
  70                 }
  71                 if (stat(dv->devname, &stb)) {
  72                         fprintf(stderr, Name ": Cannot find %s: %s\n",
  73                                 dv->devname, strerror(errno));
  74                         return 1;
  75                 }
  76                 if ((stb.st_mode & S_IFMT) != S_IFBLK) {
  77                         fprintf(stderr, Name ": %s is not a block device.\n",
  78                                 dv->devname);
  79                         return 1;
  80                 }
  81         }
  82
  83         if (raiddisks != subdevs) {
  84                 fprintf(stderr, Name ": requested %d devices in array but listed %d\n",
  85                         raiddisks, subdevs);
  86                 return 1;
  87         }
  88
  89         if (layout == UnSet)
  90                 switch(level) {
  91                 default: /* no layout */
  92                         layout = 0;
  93                         break;
  94                 case 10:
  95                         layout = 0x102; /* near=2, far=1 */
  96                         if (verbose > 0)
  97                                 fprintf(stderr,
  98                                         Name ": layout defaults to n1\n");
  99                         break;
 100                 case 5:
 101                 case 6:
 102                         layout = map_name(r5layout, "default");
 103                         if (verbose > 0)
 104                                 fprintf(stderr,
 105                                         Name ": layout defaults to %s\n", map_num(r5layout, layout));
 106                         break;
 107                 case LEVEL_FAULTY:
 108                         layout = map_name(faultylayout, "default");
 109
 110                         if (verbose > 0)
 111                                 fprintf(stderr,
 112                                         Name ": layout defaults to %s\n", map_num(faultylayout, layout));
 113                         break;
 114                 }
 115
 116         /* We need to create the device */
 117         mdfd = create_mddev(mddev, autof);
 118         if (mdfd < 0)
 119                 return 1;
 120
 121         vers = md_get_version(mdfd);
 122
 123         /* looks Ok, go for it */
 124         if (vers >= 9000) {
 125                 mdu_array_info_t array;
 126                 array.level = level;
 127                 array.size = 0;
 128                 array.nr_disks = raiddisks;
 129                 array.raid_disks = raiddisks;
 130                 array.md_minor = 0;
 131                 if (fstat(mdfd, &stb)==0)
 132                         array.md_minor = minor(stb.st_rdev);
 133                 array.not_persistent = 1;
 134                 array.state = 0; /* not clean, but no errors */
 135                 if (assume_clean)
 136                         array.state |= 1;
 137                 array.active_disks = raiddisks - missing_disks;
 138                 array.working_disks = raiddisks - missing_disks;
 139                 array.spare_disks = 0;
 140                 array.failed_disks = missing_disks;
 141                 if (chunk == 0 && (level==0 || level==LEVEL_LINEAR))
 142                         chunk = 64;
 143                 array.chunk_size = chunk*1024;
 144                 array.layout = layout;
 145                 if (ioctl(mdfd, SET_ARRAY_INFO, &array)) {
 146                         fprintf(stderr, Name ": SET_ARRAY_INFO failed for %s: %s\n",
 147                                 mddev, strerror(errno));
 148                         goto abort;
 149                 }
 150         } else if (bitmap_file) {
 151                 fprintf(stderr, Name ": bitmaps not supported with this kernel\n");
 152                 goto abort;
 153         }
 154
 155         if (bitmap_file && level <= 0) {
 156                 fprintf(stderr, Name ": bitmaps not meaningful with level %s\n",
 157                         map_num(pers, level)?:"given");
 158                 goto abort;
 159         }
 160         /* now add the devices */
 161         for ((i=0), (dv = devlist) ; dv ; i++, dv=dv->next) {
 162                 unsigned long long dsize;
 163                 int fd;
 164                 if (strcmp("missing", dv->devname) == 0)
 165                         continue;
 166                 if (stat(dv->devname, &stb)) {
 167                         fprintf(stderr, Name ": Weird: %s has disappeared.\n",
 168                                 dv->devname);
 169                         goto abort;
 170                 }
 171                 if ((stb.st_mode & S_IFMT)!= S_IFBLK) {
 172                         fprintf(stderr, Name ": Wierd: %s is no longer a block device.\n",
 173                                 dv->devname);
 174                         goto abort;
 175                 }
 176                 fd = open(dv->devname, O_RDONLY|O_EXCL);
 177                 if (fd < 0) {
 178                         fprintf(stderr, Name ": Cannot open %s: %s\n",
 179                                 dv->devname, strerror(errno));
 180                         goto abort;
 181                 }
 182                 if (get_dev_size(fd, NULL, &dsize) &&
 183                     (size == 0 || dsize < size))
 184                                 size = dsize;
 185                 close(fd);
 186                 if (vers>= 9000) {
 187                         mdu_disk_info_t disk;
 188                         disk.number = i;
 189                         disk.raid_disk = i;
 190                         disk.state = (1<<MD_DISK_SYNC) | (1<<MD_DISK_ACTIVE);
 191                         if (dv->writemostly == 1)
 192                                 disk.state |= 1<<MD_DISK_WRITEMOSTLY;
 193                         disk.major = major(stb.st_rdev);
 194                         disk.minor = minor(stb.st_rdev);
 195                         if (ioctl(mdfd, ADD_NEW_DISK, &disk)) {
 196                                 fprintf(stderr, Name ": ADD_NEW_DISK failed for %s: %s\n",
 197                                         dv->devname, strerror(errno));
 198                                 goto abort;
 199                         }
 200                 } else {
 201                         if (ioctl(mdfd, REGISTER_DEV, &stb.st_rdev)) {
 202                                 fprintf(stderr, Name ": REGISTER_DEV failed for %s: %s.\n",
 203                                         dv->devname, strerror(errno));
 204                                 goto abort;
 205                         }
 206                 }
 207         }
 208         /* now to start it */
 209         if (vers >= 9000) {
 210                 mdu_param_t param; /* not used by syscall */
 211                 if (bitmap_file) {
 212                         bitmap_fd = open(bitmap_file, O_RDWR);
 213                         if (bitmap_fd < 0) {
 214                                 int major = BITMAP_MAJOR_HI;
 215 #if 0
 216                                 if (bitmap_chunk == UnSet) {
 217                                         fprintf(stderr, Name ": %s cannot be openned.",
 218                                                 bitmap_file);
 219                                         goto abort;
 220                                 }
 221 #endif
 222                                 if (vers < 9003) {
 223                                         major = BITMAP_MAJOR_HOSTENDIAN;
 224 #ifdef __BIG_ENDIAN
 225                                         fprintf(stderr, Name ": Warning - bitmaps created on this kernel are not portable\n"
 226                                                 "  between different architectures.  Consider upgrading the Linux kernel.\n");
 227 #endif
 228                                 }
 229                                 bitmapsize = size>>9; /* FIXME wrong for RAID10 */
 230                                 if (CreateBitmap(bitmap_file, 1, NULL, bitmap_chunk,
 231                                                  delay, write_behind, bitmapsize, major)) {
 232                                         goto abort;
 233                                 }
 234                                 bitmap_fd = open(bitmap_file, O_RDWR);
 235                                 if (bitmap_fd < 0) {
 236                                         fprintf(stderr, Name ": %s cannot be openned.",
 237                                                 bitmap_file);
 238                                         goto abort;
 239                                 }
 240                         }
 241                         if (bitmap_fd >= 0) {
 242                                 if (ioctl(mdfd, SET_BITMAP_FILE, bitmap_fd) < 0) {
 243                                         fprintf(stderr, Name ": Cannot set bitmap file for %s: %s\n",
 244                                                 mddev, strerror(errno));
 245                                         goto abort;
 246                                 }
 247                         }
 248                 }
 249                 if (ioctl(mdfd, RUN_ARRAY, &param)) {
 250                         fprintf(stderr, Name ": RUN_ARRAY failed: %s\n",
 251                                 strerror(errno));
 252                         goto abort;
 253                 }
 254         } else {
 255                 unsigned long arg;
 256                 arg=0;
 257                 while (chunk > 4096) {
 258                         arg++;
 259                         chunk >>= 1;
 260                 }
 261                 if (level == 0)
 262                         chunk |= 0x20000;
 263                 else    chunk |= 0x10000;
 264                 if (ioctl(mdfd, START_MD, arg)) {
 265                         fprintf(stderr, Name ": START_MD failed: %s\n",
 266                                 strerror(errno));
 267                         goto abort;
 268                 }
 269         }
 270         if (verbose >= 0)
 271                 fprintf(stderr, Name ": array %s built and started.\n",
 272                         mddev);
 273         close(mdfd);
 274         return 0;
 275
 276  abort:
 277         if (vers >= 9000)
 278             ioctl(mdfd, STOP_ARRAY, 0);
 279         else
 280             ioctl(mdfd, STOP_MD, 0);
 281         close(mdfd);
 282         return 1;
 283 }