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
  66         /* scan all devices, make sure they really are block devices */
  67         for (dv = devlist; dv; dv=dv->next) {
  68                 subdevs++;
  69                 if (strcmp("missing", dv->devname) == 0) {
  70                         missing_disks++;
  71                         continue;
  72                 }
  73                 if (stat(dv->devname, &stb)) {
  74                         fprintf(stderr, Name ": Cannot find %s: %s\n",
  75                                 dv->devname, strerror(errno));
  76                         return 1;
  77                 }
  78                 if ((stb.st_mode & S_IFMT) != S_IFBLK) {
  79                         fprintf(stderr, Name ": %s is not a block device.\n",
  80                                 dv->devname);
  81                         return 1;
  82                 }
  83         }
  84
  85         if (raiddisks != subdevs) {
  86                 fprintf(stderr, Name ": requested %d devices in array but listed %d\n",
  87                         raiddisks, subdevs);
  88                 return 1;
  89         }
  90
  91         if (layout == UnSet)
  92                 switch(level) {
  93                 default: /* no layout */
  94                         layout = 0;
  95                         break;
  96                 case 10:
  97                         layout = 0x102; /* near=2, far=1 */
  98                         if (verbose > 0)
  99                                 fprintf(stderr,
 100                                         Name ": layout defaults to n1\n");
 101                         break;
 102                 case 5:
 103                 case 6:
 104                         layout = map_name(r5layout, "default");
 105                         if (verbose > 0)
 106                                 fprintf(stderr,
 107                                         Name ": layout defaults to %s\n", map_num(r5layout, layout));
 108                         break;
 109                 case LEVEL_FAULTY:
 110                         layout = map_name(faultylayout, "default");
 111
 112                         if (verbose > 0)
 113                                 fprintf(stderr,
 114                                         Name ": layout defaults to %s\n", map_num(faultylayout, layout));
 115                         break;
 116                 }
 117
 118         /* We need to create the device.  It can have no name. */
 119         mdfd = create_mddev(mddev, NULL, autof, LOCAL,
 120                             chosen_name);
 121         if (mdfd < 0)
 122                 return 1;
 123
 124         map_update(NULL, fd2devnum(mdfd), "none", uuid, chosen_name);
 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 = 0;
 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         close(mdfd);
 279         return 0;
 280
 281  abort:
 282         if (vers >= 9000)
 283             ioctl(mdfd, STOP_ARRAY, 0);
 284         else
 285             ioctl(mdfd, STOP_MD, 0);
 286         close(mdfd);
 287         return 1;
 288 }