Build.c

   1 /*
   2  * mdadm - manage Linux "md" devices aka RAID arrays.
   3  *
   4  * Copyright (C) 2001-2009 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@suse.de>
  23  */
  24
  25 #include "mdadm.h"
  26
  27 #define REGISTER_DEV            _IO (MD_MAJOR, 1)
  28 #define START_MD                _IO (MD_MAJOR, 2)
  29 #define STOP_MD                 _IO (MD_MAJOR, 3)
  30
  31 int Build(char *mddev, int chunk, int level, int layout,
  32           int raiddisks, struct mddev_dev *devlist, int assume_clean,
  33           char *bitmap_file, int bitmap_chunk, int write_behind,
  34           int delay, int verbose, int autof, unsigned long long size)
  35 {
  36         /* Build a linear or raid0 arrays without superblocks
  37          * We cannot really do any checks, we just do it.
  38          * For md_version < 0.90.0, we call REGISTER_DEV
  39          * with the device numbers, and then
  40          * START_MD giving the "geometry"
  41          * geometry is 0xpp00cc
  42          * where pp is personality: 1==linear, 2=raid0
  43          * cc = chunk size factor: 0==4k, 1==8k etc.
  44          *
  45          * For md_version >= 0.90.0 we call
  46          * SET_ARRAY_INFO,  ADD_NEW_DISK, RUN_ARRAY
  47          *
  48          */
  49         int i;
  50         int vers;
  51         struct stat stb;
  52         int subdevs = 0, missing_disks = 0;
  53         struct mddev_dev *dv;
  54         int bitmap_fd;
  55         unsigned long long bitmapsize;
  56         int mdfd;
  57         char chosen_name[1024];
  58         int uuid[4] = {0,0,0,0};
  59         struct map_ent *map = NULL;
  60
  61         /* scan all devices, make sure they really are block devices */
  62         for (dv = devlist; dv; dv=dv->next) {
  63                 subdevs++;
  64                 if (strcmp("missing", dv->devname) == 0) {
  65                         missing_disks++;
  66                         continue;
  67                 }
  68                 if (stat(dv->devname, &stb)) {
  69                         pr_err("Cannot find %s: %s\n",
  70                                 dv->devname, strerror(errno));
  71                         return 1;
  72                 }
  73                 if ((stb.st_mode & S_IFMT) != S_IFBLK) {
  74                         pr_err("%s is not a block device.\n",
  75                                 dv->devname);
  76                         return 1;
  77                 }
  78         }
  79
  80         if (raiddisks != subdevs) {
  81                 pr_err("requested %d devices in array but listed %d\n",
  82                         raiddisks, subdevs);
  83                 return 1;
  84         }
  85
  86         if (layout == UnSet)
  87                 switch(level) {
  88                 default: /* no layout */
  89                         layout = 0;
  90                         break;
  91                 case 10:
  92                         layout = 0x102; /* near=2, far=1 */
  93                         if (verbose > 0)
  94                                 pr_err("layout defaults to n1\n");
  95                         break;
  96                 case 5:
  97                 case 6:
  98                         layout = map_name(r5layout, "default");
  99                         if (verbose > 0)
 100                                 pr_err("layout defaults to %s\n", map_num(r5layout, layout));
 101                         break;
 102                 case LEVEL_FAULTY:
 103                         layout = map_name(faultylayout, "default");
 104
 105                         if (verbose > 0)
 106                                 pr_err("layout defaults to %s\n", map_num(faultylayout, layout));
 107                         break;
 108                 }
 109
 110         /* We need to create the device.  It can have no name. */
 111         map_lock(&map);
 112         mdfd = create_mddev(mddev, NULL, autof, LOCAL,
 113                             chosen_name);
 114         if (mdfd < 0) {
 115                 map_unlock(&map);
 116                 return 1;
 117         }
 118         mddev = chosen_name;
 119
 120         map_update(&map, fd2devnum(mdfd), "none", uuid, chosen_name);
 121         map_unlock(&map);
 122
 123         vers = md_get_version(mdfd);
 124
 125         /* looks Ok, go for it */
 126         if (vers >= 9000) {
 127                 mdu_array_info_t array;
 128                 array.level = level;
 129                 array.size = size;
 130                 array.nr_disks = raiddisks;
 131                 array.raid_disks = raiddisks;
 132                 array.md_minor = 0;
 133                 if (fstat(mdfd, &stb)==0)
 134                         array.md_minor = minor(stb.st_rdev);
 135                 array.not_persistent = 1;
 136                 array.state = 0; /* not clean, but no errors */
 137                 if (assume_clean)
 138                         array.state |= 1;
 139                 array.active_disks = raiddisks - missing_disks;
 140                 array.working_disks = raiddisks - missing_disks;
 141                 array.spare_disks = 0;
 142                 array.failed_disks = missing_disks;
 143                 if (chunk == 0 && (level==0 || level==LEVEL_LINEAR))
 144                         chunk = 64;
 145                 array.chunk_size = chunk*1024;
 146                 array.layout = layout;
 147                 if (ioctl(mdfd, SET_ARRAY_INFO, &array)) {
 148                         pr_err("SET_ARRAY_INFO failed for %s: %s\n",
 149                                 mddev, strerror(errno));
 150                         goto abort;
 151                 }
 152         } else if (bitmap_file) {
 153                 pr_err("bitmaps not supported with this kernel\n");
 154                 goto abort;
 155         }
 156
 157         if (bitmap_file && level <= 0) {
 158                 pr_err("bitmaps not meaningful with level %s\n",
 159                         map_num(pers, level)?:"given");
 160                 goto abort;
 161         }
 162         /* now add the devices */
 163         for ((i=0), (dv = devlist) ; dv ; i++, dv=dv->next) {
 164                 unsigned long long dsize;
 165                 int fd;
 166                 if (strcmp("missing", dv->devname) == 0)
 167                         continue;
 168                 if (stat(dv->devname, &stb)) {
 169                         pr_err("Weird: %s has disappeared.\n",
 170                                 dv->devname);
 171                         goto abort;
 172                 }
 173                 if ((stb.st_mode & S_IFMT)!= S_IFBLK) {
 174                         pr_err("Wierd: %s is no longer a block device.\n",
 175                                 dv->devname);
 176                         goto abort;
 177                 }
 178                 fd = open(dv->devname, O_RDONLY|O_EXCL);
 179                 if (fd < 0) {
 180                         pr_err("Cannot open %s: %s\n",
 181                                 dv->devname, strerror(errno));
 182                         goto abort;
 183                 }
 184                 if (get_dev_size(fd, NULL, &dsize) &&
 185                     (size == 0 || dsize < size))
 186                                 size = dsize;
 187                 close(fd);
 188                 if (vers >= 9000) {
 189                         mdu_disk_info_t disk;
 190                         disk.number = i;
 191                         disk.raid_disk = i;
 192                         disk.state = (1<<MD_DISK_SYNC) | (1<<MD_DISK_ACTIVE);
 193                         if (dv->writemostly == 1)
 194                                 disk.state |= 1<<MD_DISK_WRITEMOSTLY;
 195                         disk.major = major(stb.st_rdev);
 196                         disk.minor = minor(stb.st_rdev);
 197                         if (ioctl(mdfd, ADD_NEW_DISK, &disk)) {
 198                                 pr_err("ADD_NEW_DISK failed for %s: %s\n",
 199                                         dv->devname, strerror(errno));
 200                                 goto abort;
 201                         }
 202                 } else {
 203                         if (ioctl(mdfd, REGISTER_DEV, &stb.st_rdev)) {
 204                                 pr_err("REGISTER_DEV failed for %s: %s.\n",
 205                                         dv->devname, strerror(errno));
 206                                 goto abort;
 207                         }
 208                 }
 209         }
 210         /* now to start it */
 211         if (vers >= 9000) {
 212                 mdu_param_t param; /* not used by syscall */
 213                 if (bitmap_file) {
 214                         bitmap_fd = open(bitmap_file, O_RDWR);
 215                         if (bitmap_fd < 0) {
 216                                 int major = BITMAP_MAJOR_HI;
 217 #if 0
 218                                 if (bitmap_chunk == UnSet) {
 219                                         pr_err("%s cannot be openned.",
 220                                                 bitmap_file);
 221                                         goto abort;
 222                                 }
 223 #endif
 224                                 if (vers < 9003) {
 225                                         major = BITMAP_MAJOR_HOSTENDIAN;
 226 #ifdef __BIG_ENDIAN
 227                                         pr_err("Warning - bitmaps created on this kernel are not portable\n"
 228                                                 "  between different architectures.  Consider upgrading the Linux kernel.\n");
 229 #endif
 230                                 }
 231                                 bitmapsize = size>>9; /* FIXME wrong for RAID10 */
 232                                 if (CreateBitmap(bitmap_file, 1, NULL, bitmap_chunk,
 233                                                  delay, write_behind, bitmapsize, major)) {
 234                                         goto abort;
 235                                 }
 236                                 bitmap_fd = open(bitmap_file, O_RDWR);
 237                                 if (bitmap_fd < 0) {
 238                                         pr_err("%s cannot be openned.",
 239                                                 bitmap_file);
 240                                         goto abort;
 241                                 }
 242                         }
 243                         if (bitmap_fd >= 0) {
 244                                 if (ioctl(mdfd, SET_BITMAP_FILE, bitmap_fd) < 0) {
 245                                         pr_err("Cannot set bitmap file for %s: %s\n",
 246                                                 mddev, strerror(errno));
 247                                         goto abort;
 248                                 }
 249                         }
 250                 }
 251                 if (ioctl(mdfd, RUN_ARRAY, &param)) {
 252                         pr_err("RUN_ARRAY failed: %s\n",
 253                                 strerror(errno));
 254                         if (chunk & (chunk-1)) {
 255                                 cont_err("Problem may be that chunk size"
 256                                          " is not a power of 2\n");
 257                         }
 258                         goto abort;
 259                 }
 260         } else {
 261                 unsigned long arg;
 262                 arg=0;
 263                 while (chunk > 4096) {
 264                         arg++;
 265                         chunk >>= 1;
 266                 }
 267                 if (level == 0)
 268                         chunk |= 0x20000;
 269                 else    chunk |= 0x10000;
 270                 if (ioctl(mdfd, START_MD, arg)) {
 271                         pr_err("START_MD failed: %s\n",
 272                                 strerror(errno));
 273                         goto abort;
 274                 }
 275         }
 276         if (verbose >= 0)
 277                 pr_err("array %s built and started.\n",
 278                         mddev);
 279         wait_for(mddev, mdfd);
 280         close(mdfd);
 281         return 0;
 282
 283  abort:
 284         if (vers >= 9000)
 285             ioctl(mdfd, STOP_ARRAY, 0);
 286         else
 287             ioctl(mdfd, STOP_MD, 0);
 288         close(mdfd);
 289         return 1;
 290 }