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         char chosen_name[1024];
  64         int uuid[4] = {0,0,0,0};
  65         struct map_ent *map = NULL;
  66
  67         /* scan all devices, make sure they really are block devices */
  68         for (dv = devlist; dv; dv=dv->next) {
  69                 subdevs++;
  70                 if (strcmp("missing", dv->devname) == 0) {
  71                         missing_disks++;
  72                         continue;
  73                 }
  74                 if (stat(dv->devname, &stb)) {
  75                         fprintf(stderr, Name ": Cannot find %s: %s\n",
  76                                 dv->devname, strerror(errno));
  77                         return 1;
  78                 }
  79                 if ((stb.st_mode & S_IFMT) != S_IFBLK) {
  80                         fprintf(stderr, Name ": %s is not a block device.\n",
  81                                 dv->devname);
  82                         return 1;
  83                 }
  84         }
  85
  86         if (raiddisks != subdevs) {
  87                 fprintf(stderr, Name ": requested %d devices in array but listed %d\n",
  88                         raiddisks, subdevs);
  89                 return 1;
  90         }
  91
  92         if (layout == UnSet)
  93                 switch(level) {
  94                 default: /* no layout */
  95                         layout = 0;
  96                         break;
  97                 case 10:
  98                         layout = 0x102; /* near=2, far=1 */
  99                         if (verbose > 0)
 100                                 fprintf(stderr,
 101                                         Name ": layout defaults to n1\n");
 102                         break;
 103                 case 5:
 104                 case 6:
 105                         layout = map_name(r5layout, "default");
 106                         if (verbose > 0)
 107                                 fprintf(stderr,
 108                                         Name ": layout defaults to %s\n", map_num(r5layout, layout));
 109                         break;
 110                 case LEVEL_FAULTY:
 111                         layout = map_name(faultylayout, "default");
 112
 113                         if (verbose > 0)
 114                                 fprintf(stderr,
 115                                         Name ": layout defaults to %s\n", map_num(faultylayout, layout));
 116                         break;
 117                 }
 118
 119         /* We need to create the device.  It can have no name. */
 120         map_lock(&map);
 121         mdfd = create_mddev(mddev, NULL, autof, LOCAL,
 122                             chosen_name);
 123         if (mdfd < 0) {
 124                 map_unlock(&map);
 125                 return 1;
 126         }
 127         mddev = chosen_name;
 128
 129         map_update(&map, fd2devnum(mdfd), "none", uuid, chosen_name);
 130         map_unlock(&map);
 131
 132         vers = md_get_version(mdfd);
 133
 134         /* looks Ok, go for it */
 135         if (vers >= 9000) {
 136                 mdu_array_info_t array;
 137                 array.level = level;
 138                 array.size = 0;
 139                 array.nr_disks = raiddisks;
 140                 array.raid_disks = raiddisks;
 141                 array.md_minor = 0;
 142                 if (fstat(mdfd, &stb)==0)
 143                         array.md_minor = minor(stb.st_rdev);
 144                 array.not_persistent = 1;
 145                 array.state = 0; /* not clean, but no errors */
 146                 if (assume_clean)
 147                         array.state |= 1;
 148                 array.active_disks = raiddisks - missing_disks;
 149                 array.working_disks = raiddisks - missing_disks;
 150                 array.spare_disks = 0;
 151                 array.failed_disks = missing_disks;
 152                 if (chunk == 0 && (level==0 || level==LEVEL_LINEAR))
 153                         chunk = 64;
 154                 array.chunk_size = chunk*1024;
 155                 array.layout = layout;
 156                 if (ioctl(mdfd, SET_ARRAY_INFO, &array)) {
 157                         fprintf(stderr, Name ": SET_ARRAY_INFO failed for %s: %s\n",
 158                                 mddev, strerror(errno));
 159                         goto abort;
 160                 }
 161         } else if (bitmap_file) {
 162                 fprintf(stderr, Name ": bitmaps not supported with this kernel\n");
 163                 goto abort;
 164         }
 165
 166         if (bitmap_file && level <= 0) {
 167                 fprintf(stderr, Name ": bitmaps not meaningful with level %s\n",
 168                         map_num(pers, level)?:"given");
 169                 goto abort;
 170         }
 171         /* now add the devices */
 172         for ((i=0), (dv = devlist) ; dv ; i++, dv=dv->next) {
 173                 unsigned long long dsize;
 174                 int fd;
 175                 if (strcmp("missing", dv->devname) == 0)
 176                         continue;
 177                 if (stat(dv->devname, &stb)) {
 178                         fprintf(stderr, Name ": Weird: %s has disappeared.\n",
 179                                 dv->devname);
 180                         goto abort;
 181                 }
 182                 if ((stb.st_mode & S_IFMT)!= S_IFBLK) {
 183                         fprintf(stderr, Name ": Wierd: %s is no longer a block device.\n",
 184                                 dv->devname);
 185                         goto abort;
 186                 }
 187                 fd = open(dv->devname, O_RDONLY|O_EXCL);
 188                 if (fd < 0) {
 189                         fprintf(stderr, Name ": Cannot open %s: %s\n",
 190                                 dv->devname, strerror(errno));
 191                         goto abort;
 192                 }
 193                 if (get_dev_size(fd, NULL, &dsize) &&
 194                     (size == 0 || dsize < size))
 195                                 size = dsize;
 196                 close(fd);
 197                 if (vers>= 9000) {
 198                         mdu_disk_info_t disk;
 199                         disk.number = i;
 200                         disk.raid_disk = i;
 201                         disk.state = (1<<MD_DISK_SYNC) | (1<<MD_DISK_ACTIVE);
 202                         if (dv->writemostly == 1)
 203                                 disk.state |= 1<<MD_DISK_WRITEMOSTLY;
 204                         disk.major = major(stb.st_rdev);
 205                         disk.minor = minor(stb.st_rdev);
 206                         if (ioctl(mdfd, ADD_NEW_DISK, &disk)) {
 207                                 fprintf(stderr, Name ": ADD_NEW_DISK failed for %s: %s\n",
 208                                         dv->devname, strerror(errno));
 209                                 goto abort;
 210                         }
 211                 } else {
 212                         if (ioctl(mdfd, REGISTER_DEV, &stb.st_rdev)) {
 213                                 fprintf(stderr, Name ": REGISTER_DEV failed for %s: %s.\n",
 214                                         dv->devname, strerror(errno));
 215                                 goto abort;
 216                         }
 217                 }
 218         }
 219         /* now to start it */
 220         if (vers >= 9000) {
 221                 mdu_param_t param; /* not used by syscall */
 222                 if (bitmap_file) {
 223                         bitmap_fd = open(bitmap_file, O_RDWR);
 224                         if (bitmap_fd < 0) {
 225                                 int major = BITMAP_MAJOR_HI;
 226 #if 0
 227                                 if (bitmap_chunk == UnSet) {
 228                                         fprintf(stderr, Name ": %s cannot be openned.",
 229                                                 bitmap_file);
 230                                         goto abort;
 231                                 }
 232 #endif
 233                                 if (vers < 9003) {
 234                                         major = BITMAP_MAJOR_HOSTENDIAN;
 235 #ifdef __BIG_ENDIAN
 236                                         fprintf(stderr, Name ": Warning - bitmaps created on this kernel are not portable\n"
 237                                                 "  between different architectures.  Consider upgrading the Linux kernel.\n");
 238 #endif
 239                                 }
 240                                 bitmapsize = size>>9; /* FIXME wrong for RAID10 */
 241                                 if (CreateBitmap(bitmap_file, 1, NULL, bitmap_chunk,
 242                                                  delay, write_behind, bitmapsize, major)) {
 243                                         goto abort;
 244                                 }
 245                                 bitmap_fd = open(bitmap_file, O_RDWR);
 246                                 if (bitmap_fd < 0) {
 247                                         fprintf(stderr, Name ": %s cannot be openned.",
 248                                                 bitmap_file);
 249                                         goto abort;
 250                                 }
 251                         }
 252                         if (bitmap_fd >= 0) {
 253                                 if (ioctl(mdfd, SET_BITMAP_FILE, bitmap_fd) < 0) {
 254                                         fprintf(stderr, Name ": Cannot set bitmap file for %s: %s\n",
 255                                                 mddev, strerror(errno));
 256                                         goto abort;
 257                                 }
 258                         }
 259                 }
 260                 if (ioctl(mdfd, RUN_ARRAY, &param)) {
 261                         fprintf(stderr, Name ": RUN_ARRAY failed: %s\n",
 262                                 strerror(errno));
 263                         goto abort;
 264                 }
 265         } else {
 266                 unsigned long arg;
 267                 arg=0;
 268                 while (chunk > 4096) {
 269                         arg++;
 270                         chunk >>= 1;
 271                 }
 272                 if (level == 0)
 273                         chunk |= 0x20000;
 274                 else    chunk |= 0x10000;
 275                 if (ioctl(mdfd, START_MD, arg)) {
 276                         fprintf(stderr, Name ": START_MD failed: %s\n",
 277                                 strerror(errno));
 278                         goto abort;
 279                 }
 280         }
 281         if (verbose >= 0)
 282                 fprintf(stderr, Name ": array %s built and started.\n",
 283                         mddev);
 284         wait_for(mddev, mdfd);
 285         close(mdfd);
 286         return 0;
 287
 288  abort:
 289         if (vers >= 9000)
 290             ioctl(mdfd, STOP_ARRAY, 0);
 291         else
 292             ioctl(mdfd, STOP_MD, 0);
 293         close(mdfd);
 294         return 1;
 295 }