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                         fprintf(stderr, Name ": Cannot find %s: %s\n",
  70                                 dv->devname, strerror(errno));
  71                         return 1;
  72                 }
  73                 if ((stb.st_mode & S_IFMT) != S_IFBLK) {
  74                         fprintf(stderr, Name ": %s is not a block device.\n",
  75                                 dv->devname);
  76                         return 1;
  77                 }
  78         }
  79
  80         if (raiddisks != subdevs) {
  81                 fprintf(stderr, Name ": 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                                 fprintf(stderr,
  95                                         Name ": layout defaults to n1\n");
  96                         break;
  97                 case 5:
  98                 case 6:
  99                         layout = map_name(r5layout, "default");
 100                         if (verbose > 0)
 101                                 fprintf(stderr,
 102                                         Name ": layout defaults to %s\n", map_num(r5layout, layout));
 103                         break;
 104                 case LEVEL_FAULTY:
 105                         layout = map_name(faultylayout, "default");
 106
 107                         if (verbose > 0)
 108                                 fprintf(stderr,
 109                                         Name ": layout defaults to %s\n", map_num(faultylayout, layout));
 110                         break;
 111                 }
 112
 113         /* We need to create the device.  It can have no name. */
 114         map_lock(&map);
 115         mdfd = create_mddev(mddev, NULL, autof, LOCAL,
 116                             chosen_name);
 117         if (mdfd < 0) {
 118                 map_unlock(&map);
 119                 return 1;
 120         }
 121         mddev = chosen_name;
 122
 123         map_update(&map, fd2devnum(mdfd), "none", uuid, chosen_name);
 124         map_unlock(&map);
 125
 126         vers = md_get_version(mdfd);
 127
 128         /* looks Ok, go for it */
 129         if (vers >= 9000) {
 130                 mdu_array_info_t array;
 131                 array.level = level;
 132                 array.size = size;
 133                 array.nr_disks = raiddisks;
 134                 array.raid_disks = raiddisks;
 135                 array.md_minor = 0;
 136                 if (fstat(mdfd, &stb)==0)
 137                         array.md_minor = minor(stb.st_rdev);
 138                 array.not_persistent = 1;
 139                 array.state = 0; /* not clean, but no errors */
 140                 if (assume_clean)
 141                         array.state |= 1;
 142                 array.active_disks = raiddisks - missing_disks;
 143                 array.working_disks = raiddisks - missing_disks;
 144                 array.spare_disks = 0;
 145                 array.failed_disks = missing_disks;
 146                 if (chunk == 0 && (level==0 || level==LEVEL_LINEAR))
 147                         chunk = 64;
 148                 array.chunk_size = chunk*1024;
 149                 array.layout = layout;
 150                 if (ioctl(mdfd, SET_ARRAY_INFO, &array)) {
 151                         fprintf(stderr, Name ": SET_ARRAY_INFO failed for %s: %s\n",
 152                                 mddev, strerror(errno));
 153                         goto abort;
 154                 }
 155         } else if (bitmap_file) {
 156                 fprintf(stderr, Name ": bitmaps not supported with this kernel\n");
 157                 goto abort;
 158         }
 159
 160         if (bitmap_file && level <= 0) {
 161                 fprintf(stderr, Name ": bitmaps not meaningful with level %s\n",
 162                         map_num(pers, level)?:"given");
 163                 goto abort;
 164         }
 165         /* now add the devices */
 166         for ((i=0), (dv = devlist) ; dv ; i++, dv=dv->next) {
 167                 unsigned long long dsize;
 168                 int fd;
 169                 if (strcmp("missing", dv->devname) == 0)
 170                         continue;
 171                 if (stat(dv->devname, &stb)) {
 172                         fprintf(stderr, Name ": Weird: %s has disappeared.\n",
 173                                 dv->devname);
 174                         goto abort;
 175                 }
 176                 if ((stb.st_mode & S_IFMT)!= S_IFBLK) {
 177                         fprintf(stderr, Name ": Wierd: %s is no longer a block device.\n",
 178                                 dv->devname);
 179                         goto abort;
 180                 }
 181                 fd = open(dv->devname, O_RDONLY|O_EXCL);
 182                 if (fd < 0) {
 183                         fprintf(stderr, Name ": Cannot open %s: %s\n",
 184                                 dv->devname, strerror(errno));
 185                         goto abort;
 186                 }
 187                 if (get_dev_size(fd, NULL, &dsize) &&
 188                     (size == 0 || dsize < size))
 189                                 size = dsize;
 190                 close(fd);
 191                 if (vers >= 9000) {
 192                         mdu_disk_info_t disk;
 193                         disk.number = i;
 194                         disk.raid_disk = i;
 195                         disk.state = (1<<MD_DISK_SYNC) | (1<<MD_DISK_ACTIVE);
 196                         if (dv->writemostly == 1)
 197                                 disk.state |= 1<<MD_DISK_WRITEMOSTLY;
 198                         disk.major = major(stb.st_rdev);
 199                         disk.minor = minor(stb.st_rdev);
 200                         if (ioctl(mdfd, ADD_NEW_DISK, &disk)) {
 201                                 fprintf(stderr, Name ": ADD_NEW_DISK failed for %s: %s\n",
 202                                         dv->devname, strerror(errno));
 203                                 goto abort;
 204                         }
 205                 } else {
 206                         if (ioctl(mdfd, REGISTER_DEV, &stb.st_rdev)) {
 207                                 fprintf(stderr, Name ": REGISTER_DEV failed for %s: %s.\n",
 208                                         dv->devname, strerror(errno));
 209                                 goto abort;
 210                         }
 211                 }
 212         }
 213         /* now to start it */
 214         if (vers >= 9000) {
 215                 mdu_param_t param; /* not used by syscall */
 216                 if (bitmap_file) {
 217                         bitmap_fd = open(bitmap_file, O_RDWR);
 218                         if (bitmap_fd < 0) {
 219                                 int major = BITMAP_MAJOR_HI;
 220 #if 0
 221                                 if (bitmap_chunk == UnSet) {
 222                                         fprintf(stderr, Name ": %s cannot be openned.",
 223                                                 bitmap_file);
 224                                         goto abort;
 225                                 }
 226 #endif
 227                                 if (vers < 9003) {
 228                                         major = BITMAP_MAJOR_HOSTENDIAN;
 229 #ifdef __BIG_ENDIAN
 230                                         fprintf(stderr, Name ": Warning - bitmaps created on this kernel are not portable\n"
 231                                                 "  between different architectures.  Consider upgrading the Linux kernel.\n");
 232 #endif
 233                                 }
 234                                 bitmapsize = size>>9; /* FIXME wrong for RAID10 */
 235                                 if (CreateBitmap(bitmap_file, 1, NULL, bitmap_chunk,
 236                                                  delay, write_behind, bitmapsize, major)) {
 237                                         goto abort;
 238                                 }
 239                                 bitmap_fd = open(bitmap_file, O_RDWR);
 240                                 if (bitmap_fd < 0) {
 241                                         fprintf(stderr, Name ": %s cannot be openned.",
 242                                                 bitmap_file);
 243                                         goto abort;
 244                                 }
 245                         }
 246                         if (bitmap_fd >= 0) {
 247                                 if (ioctl(mdfd, SET_BITMAP_FILE, bitmap_fd) < 0) {
 248                                         fprintf(stderr, Name ": Cannot set bitmap file for %s: %s\n",
 249                                                 mddev, strerror(errno));
 250                                         goto abort;
 251                                 }
 252                         }
 253                 }
 254                 if (ioctl(mdfd, RUN_ARRAY, &param)) {
 255                         fprintf(stderr, Name ": RUN_ARRAY failed: %s\n",
 256                                 strerror(errno));
 257                         goto abort;
 258                 }
 259         } else {
 260                 unsigned long arg;
 261                 arg=0;
 262                 while (chunk > 4096) {
 263                         arg++;
 264                         chunk >>= 1;
 265                 }
 266                 if (level == 0)
 267                         chunk |= 0x20000;
 268                 else    chunk |= 0x10000;
 269                 if (ioctl(mdfd, START_MD, arg)) {
 270                         fprintf(stderr, Name ": START_MD failed: %s\n",
 271                                 strerror(errno));
 272                         goto abort;
 273                 }
 274         }
 275         if (verbose >= 0)
 276                 fprintf(stderr, Name ": array %s built and started.\n",
 277                         mddev);
 278         wait_for(mddev, mdfd);
 279         close(mdfd);
 280         return 0;
 281
 282  abort:
 283         if (vers >= 9000)
 284             ioctl(mdfd, STOP_ARRAY, 0);
 285         else
 286             ioctl(mdfd, STOP_MD, 0);
 287         close(mdfd);
 288         return 1;
 289 }