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, struct mddev_dev *devlist,
  32           struct shape *s, struct context *c)
  33 {
  34         /* Build a linear or raid0 arrays without superblocks
  35          * We cannot really do any checks, we just do it.
  36          * For md_version < 0.90.0, we call REGISTER_DEV
  37          * with the device numbers, and then
  38          * START_MD giving the "geometry"
  39          * geometry is 0xpp00cc
  40          * where pp is personality: 1==linear, 2=raid0
  41          * cc = chunk size factor: 0==4k, 1==8k etc.
  42          *
  43          * For md_version >= 0.90.0 we call
  44          * SET_ARRAY_INFO,  ADD_NEW_DISK, RUN_ARRAY
  45          *
  46          */
  47         int i;
  48         int vers;
  49         struct stat stb;
  50         int subdevs = 0, missing_disks = 0;
  51         struct mddev_dev *dv;
  52         int bitmap_fd;
  53         unsigned long long bitmapsize;
  54         int mdfd;
  55         char chosen_name[1024];
  56         int uuid[4] = {0,0,0,0};
  57         struct map_ent *map = NULL;
  58
  59         if (s->level == UnSet) {
  60                 pr_err("a RAID level is needed to Build an array.\n");
  61                 return 1;
  62         }
  63         /* scan all devices, make sure they really are block devices */
  64         for (dv = devlist; dv; dv=dv->next) {
  65                 subdevs++;
  66                 if (strcmp("missing", dv->devname) == 0) {
  67                         missing_disks++;
  68                         continue;
  69                 }
  70                 if (stat(dv->devname, &stb)) {
  71                         pr_err("Cannot find %s: %s\n",
  72                                 dv->devname, strerror(errno));
  73                         return 1;
  74                 }
  75                 if ((stb.st_mode & S_IFMT) != S_IFBLK) {
  76                         pr_err("%s is not a block device.\n",
  77                                 dv->devname);
  78                         return 1;
  79                 }
  80         }
  81
  82         if (s->raiddisks != subdevs) {
  83                 pr_err("requested %d devices in array but listed %d\n",
  84                         s->raiddisks, subdevs);
  85                 return 1;
  86         }
  87
  88         if (s->layout == UnSet)
  89                 switch(s->level) {
  90                 default: /* no layout */
  91                         s->layout = 0;
  92                         break;
  93                 case 10:
  94                         s->layout = 0x102; /* near=2, far=1 */
  95                         if (c->verbose > 0)
  96                                 pr_err("layout defaults to n1\n");
  97                         break;
  98                 case 5:
  99                 case 6:
 100                         s->layout = map_name(r5layout, "default");
 101                         if (c->verbose > 0)
 102                                 pr_err("layout defaults to %s\n", map_num(r5layout, s->layout));
 103                         break;
 104                 case LEVEL_FAULTY:
 105                         s->layout = map_name(faultylayout, "default");
 106
 107                         if (c->verbose > 0)
 108                                 pr_err("layout defaults to %s\n", map_num(faultylayout, s->layout));
 109                         break;
 110                 }
 111
 112         /* We need to create the device.  It can have no name. */
 113         map_lock(&map);
 114         mdfd = create_mddev(mddev, NULL, c->autof, LOCAL,
 115                             chosen_name);
 116         if (mdfd < 0) {
 117                 map_unlock(&map);
 118                 return 1;
 119         }
 120         mddev = chosen_name;
 121
 122         map_update(&map, fd2devnm(mdfd), "none", uuid, chosen_name);
 123         map_unlock(&map);
 124
 125         vers = md_get_version(mdfd);
 126
 127         /* looks Ok, go for it */
 128         if (vers >= 9000) {
 129                 mdu_array_info_t array;
 130                 array.level = s->level;
 131                 if (s->size == MAX_SIZE)
 132                         s->size = 0;
 133                 array.size = s->size;
 134                 array.nr_disks = s->raiddisks;
 135                 array.raid_disks = s->raiddisks;
 136                 array.md_minor = 0;
 137                 if (fstat(mdfd, &stb)==0)
 138                         array.md_minor = minor(stb.st_rdev);
 139                 array.not_persistent = 1;
 140                 array.state = 0; /* not clean, but no errors */
 141                 if (s->assume_clean)
 142                         array.state |= 1;
 143                 array.active_disks = s->raiddisks - missing_disks;
 144                 array.working_disks = s->raiddisks - missing_disks;
 145                 array.spare_disks = 0;
 146                 array.failed_disks = missing_disks;
 147                 if (s->chunk == 0 && (s->level==0 || s->level==LEVEL_LINEAR))
 148                         s->chunk = 64;
 149                 array.chunk_size = s->chunk*1024;
 150                 array.layout = s->layout;
 151                 if (md_set_array_info(mdfd, &array)) {
 152                         pr_err("md_set_array_info() failed for %s: %s\n",
 153                                 mddev, strerror(errno));
 154                         goto abort;
 155                 }
 156         } else if (s->bitmap_file) {
 157                 pr_err("bitmaps not supported with this kernel\n");
 158                 goto abort;
 159         }
 160
 161         if (s->bitmap_file && strcmp(s->bitmap_file, "none") == 0)
 162                 s->bitmap_file = NULL;
 163         if (s->bitmap_file && s->level <= 0) {
 164                 pr_err("bitmaps not meaningful with level %s\n",
 165                         map_num(pers, s->level)?:"given");
 166                 goto abort;
 167         }
 168         /* now add the devices */
 169         for ((i=0), (dv = devlist) ; dv ; i++, dv=dv->next) {
 170                 unsigned long long dsize;
 171                 int fd;
 172                 if (strcmp("missing", dv->devname) == 0)
 173                         continue;
 174                 if (stat(dv->devname, &stb)) {
 175                         pr_err("Weird: %s has disappeared.\n",
 176                                 dv->devname);
 177                         goto abort;
 178                 }
 179                 if ((stb.st_mode & S_IFMT)!= S_IFBLK) {
 180                         pr_err("Weird: %s is no longer a block device.\n",
 181                                 dv->devname);
 182                         goto abort;
 183                 }
 184                 fd = open(dv->devname, O_RDONLY|O_EXCL);
 185                 if (fd < 0) {
 186                         pr_err("Cannot open %s: %s\n",
 187                                 dv->devname, strerror(errno));
 188                         goto abort;
 189                 }
 190                 if (get_dev_size(fd, NULL, &dsize) &&
 191                     (s->size == 0 || s->size == MAX_SIZE || dsize < s->size))
 192                                 s->size = dsize;
 193                 close(fd);
 194                 if (vers >= 9000) {
 195                         mdu_disk_info_t disk;
 196                         disk.number = i;
 197                         disk.raid_disk = i;
 198                         disk.state = (1<<MD_DISK_SYNC) | (1<<MD_DISK_ACTIVE);
 199                         if (dv->writemostly == FlagSet)
 200                                 disk.state |= 1<<MD_DISK_WRITEMOSTLY;
 201                         disk.major = major(stb.st_rdev);
 202                         disk.minor = minor(stb.st_rdev);
 203                         if (ioctl(mdfd, ADD_NEW_DISK, &disk)) {
 204                                 pr_err("ADD_NEW_DISK failed for %s: %s\n",
 205                                         dv->devname, strerror(errno));
 206                                 goto abort;
 207                         }
 208                 } else {
 209                         if (ioctl(mdfd, REGISTER_DEV, &stb.st_rdev)) {
 210                                 pr_err("REGISTER_DEV failed for %s: %s.\n",
 211                                         dv->devname, strerror(errno));
 212                                 goto abort;
 213                         }
 214                 }
 215         }
 216         /* now to start it */
 217         if (vers >= 9000) {
 218                 mdu_param_t param; /* not used by syscall */
 219                 if (s->bitmap_file) {
 220                         bitmap_fd = open(s->bitmap_file, O_RDWR);
 221                         if (bitmap_fd < 0) {
 222                                 int major = BITMAP_MAJOR_HI;
 223 #if 0
 224                                 if (s->bitmap_chunk == UnSet) {
 225                                         pr_err("%s cannot be openned.",
 226                                                 s->bitmap_file);
 227                                         goto abort;
 228                                 }
 229 #endif
 230                                 if (vers < 9003) {
 231                                         major = BITMAP_MAJOR_HOSTENDIAN;
 232 #ifdef __BIG_ENDIAN
 233                                         pr_err("Warning - bitmaps created on this kernel are not portable\n"
 234                                                 "  between different architectures.  Consider upgrading the Linux kernel.\n");
 235 #endif
 236                                 }
 237                                 bitmapsize = s->size>>9; /* FIXME wrong for RAID10 */
 238                                 if (CreateBitmap(s->bitmap_file, 1, NULL, s->bitmap_chunk,
 239                                                  c->delay, s->write_behind, bitmapsize, major)) {
 240                                         goto abort;
 241                                 }
 242                                 bitmap_fd = open(s->bitmap_file, O_RDWR);
 243                                 if (bitmap_fd < 0) {
 244                                         pr_err("%s cannot be openned.",
 245                                                 s->bitmap_file);
 246                                         goto abort;
 247                                 }
 248                         }
 249                         if (bitmap_fd >= 0) {
 250                                 if (ioctl(mdfd, SET_BITMAP_FILE, bitmap_fd) < 0) {
 251                                         pr_err("Cannot set bitmap file for %s: %s\n",
 252                                                 mddev, strerror(errno));
 253                                         goto abort;
 254                                 }
 255                         }
 256                 }
 257                 if (ioctl(mdfd, RUN_ARRAY, &param)) {
 258                         pr_err("RUN_ARRAY failed: %s\n",
 259                                 strerror(errno));
 260                         if (s->chunk & (s->chunk-1)) {
 261                                 cont_err("Problem may be that chunk size is not a power of 2\n");
 262                         }
 263                         goto abort;
 264                 }
 265         } else {
 266                 unsigned long arg;
 267                 arg=0;
 268                 while (s->chunk > 4096) {
 269                         arg++;
 270                         s->chunk >>= 1;
 271                 }
 272                 if (s->level == 0)
 273                         arg |= 0x20000;
 274                 else
 275                         arg |= 0x10000;
 276                 if (ioctl(mdfd, START_MD, arg)) {
 277                         pr_err("START_MD failed: %s\n",
 278                                 strerror(errno));
 279                         goto abort;
 280                 }
 281         }
 282         if (c->verbose >= 0)
 283                 pr_err("array %s built and started.\n",
 284                         mddev);
 285         wait_for(mddev, mdfd);
 286         close(mdfd);
 287         return 0;
 288
 289  abort:
 290         if (vers >= 9000)
 291             ioctl(mdfd, STOP_ARRAY, 0);
 292         else
 293             ioctl(mdfd, STOP_MD, 0);
 294         close(mdfd);
 295         return 1;
 296 }