Manage.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 #include "md_u.h"
  32 #include "md_p.h"
  33
  34 #define REGISTER_DEV            _IO (MD_MAJOR, 1)
  35 #define START_MD                _IO (MD_MAJOR, 2)
  36 #define STOP_MD                 _IO (MD_MAJOR, 3)
  37
  38 int Manage_ro(char *devname, int fd, int readonly)
  39 {
  40         /* switch to readonly or rw
  41          *
  42          * requires >= 0.90.0
  43          * first check that array is runing
  44          * use RESTART_ARRAY_RW or STOP_ARRAY_RO
  45          *
  46          */
  47         mdu_array_info_t array;
  48
  49         if (md_get_version(fd) < 9000) {
  50                 fprintf(stderr, Name ": need md driver version 0.90.0 or later\n");
  51                 return 1;
  52         }
  53         if (ioctl(fd, GET_ARRAY_INFO, &array)) {
  54                 fprintf(stderr, Name ": %s does not appear to be active.\n",
  55                         devname);
  56                 return 1;
  57         }
  58
  59         if (readonly>0) {
  60                 if (ioctl(fd, STOP_ARRAY_RO, NULL)) {
  61                         fprintf(stderr, Name ": failed to set readonly for %s: %s\n",
  62                                 devname, strerror(errno));
  63                         return 1;
  64                 }
  65         } else if (readonly < 0) {
  66                 if (ioctl(fd, RESTART_ARRAY_RW, NULL)) {
  67                         fprintf(stderr, Name ": failed to set writable for %s: %s\n",
  68                                 devname, strerror(errno));
  69                         return 1;
  70                 }
  71         }
  72         return 0;
  73 }
  74
  75 int Manage_runstop(char *devname, int fd, int runstop, int quiet)
  76 {
  77         /* Run or stop the array. array must already be configured
  78          * required >= 0.90.0
  79          */
  80         mdu_param_t param; /* unused */
  81
  82         if (runstop == -1 && md_get_version(fd) < 9000) {
  83                 if (ioctl(fd, STOP_MD, 0)) {
  84                         if (!quiet) fprintf(stderr, Name ": stopping device %s failed: %s\n",
  85                                             devname, strerror(errno));
  86                         return 1;
  87                 }
  88         }
  89
  90         if (md_get_version(fd) < 9000) {
  91                 fprintf(stderr, Name ": need md driver version 0.90.0 or later\n");
  92                 return 1;
  93         }
  94         /*
  95         if (ioctl(fd, GET_ARRAY_INFO, &array)) {
  96                 fprintf(stderr, Name ": %s does not appear to be active.\n",
  97                         devname);
  98                 return 1;
  99         }
 100         */
 101         if (runstop>0) {
 102                 if (ioctl(fd, RUN_ARRAY, &param)) {
 103                         fprintf(stderr, Name ": failed to run array %s: %s\n",
 104                                 devname, strerror(errno));
 105                         return 1;
 106                 }
 107         } else if (runstop < 0){
 108                 if (ioctl(fd, STOP_ARRAY, NULL)) {
 109                         if (quiet==0)
 110                                 fprintf(stderr, Name ": fail to stop array %s: %s\n",
 111                                         devname, strerror(errno));
 112                         return 1;
 113                 }
 114                 if (quiet <= 0)
 115                         fprintf(stderr, Name ": stopped %s\n", devname);
 116         }
 117         return 0;
 118 }
 119
 120 int Manage_resize(char *devname, int fd, long long size, int raid_disks)
 121 {
 122         mdu_array_info_t info;
 123         if (ioctl(fd, GET_ARRAY_INFO, &info) != 0) {
 124                 fprintf(stderr, Name ": Cannot get array information for %s: %s\n",
 125                         devname, strerror(errno));
 126                 return 1;
 127         }
 128         if (size >= 0)
 129                 info.size = size;
 130         if (raid_disks > 0)
 131                 info.raid_disks = raid_disks;
 132         if (ioctl(fd, SET_ARRAY_INFO, &info) != 0) {
 133                 fprintf(stderr, Name ": Cannot set device size/shape for %s: %s\n",
 134                         devname, strerror(errno));
 135                 return 1;
 136         }
 137         return 0;
 138 }
 139
 140 int Manage_reconfig(char *devname, int fd, int layout)
 141 {
 142         mdu_array_info_t info;
 143         if (ioctl(fd, GET_ARRAY_INFO, &info) != 0) {
 144                 fprintf(stderr, Name ": Cannot get array information for %s: %s\n",
 145                         devname, strerror(errno));
 146                 return 1;
 147         }
 148         info.layout = layout;
 149         printf("layout set to %d\n", info.layout);
 150         if (ioctl(fd, SET_ARRAY_INFO, &info) != 0) {
 151                 fprintf(stderr, Name ": Cannot set layout for %s: %s\n",
 152                         devname, strerror(errno));
 153                 return 1;
 154         }
 155         return 0;
 156 }
 157
 158 int Manage_subdevs(char *devname, int fd,
 159                    mddev_dev_t devlist, int verbose)
 160 {
 161         /* do something to each dev.
 162          * devmode can be
 163          *  'a' - add the device
 164          *         try HOT_ADD_DISK
 165          *         If that fails EINVAL, try ADD_NEW_DISK
 166          *  'r' - remove the device HOT_REMOVE_DISK
 167          *  'f' - set the device faulty SET_DISK_FAULTY
 168          */
 169         mdu_array_info_t array;
 170         mdu_disk_info_t disc;
 171         mddev_dev_t dv;
 172         struct stat stb;
 173         int j;
 174         int tfd;
 175         struct supertype *st;
 176         void *dsuper = NULL;
 177         void *osuper = NULL; /* original super */
 178         int duuid[4];
 179         int ouuid[4];
 180
 181         if (ioctl(fd, GET_ARRAY_INFO, &array)) {
 182                 fprintf(stderr, Name ": cannot get array info for %s\n",
 183                         devname);
 184                 return 1;
 185         }
 186         for (dv = devlist ; dv; dv=dv->next) {
 187                 if (stat(dv->devname, &stb)) {
 188                         fprintf(stderr, Name ": cannot find %s: %s\n",
 189                                 dv->devname, strerror(errno));
 190                         return 1;
 191                 }
 192                 if ((stb.st_mode & S_IFMT) != S_IFBLK) {
 193                         fprintf(stderr, Name ": %s is not a block device.\n",
 194                                 dv->devname);
 195                         return 1;
 196                 }
 197                 switch(dv->disposition){
 198                 default:
 199                         fprintf(stderr, Name ": internal error - devmode[%s]=%d\n",
 200                                 dv->devname, dv->disposition);
 201                         return 1;
 202                 case 'a':
 203                         /* add the device - hot or cold */
 204                         st = super_by_version(array.major_version,
 205                                               array.minor_version);
 206                         if (!st) {
 207                                 fprintf(stderr, Name ": unsupport array - version %d.%d\n",
 208                                         array.major_version, array.minor_version);
 209                                 return 1;
 210                         }
 211
 212                         /* Make sure it isn't in use (in 2.6 or later) */
 213                         tfd = open(dv->devname, O_RDONLY|O_EXCL);
 214                         if (tfd < 0) {
 215                                 fprintf(stderr, Name ": Cannot open %s: %s\n",
 216                                         dv->devname, strerror(errno));
 217                                 return 1;
 218                         }
 219                         if (array.not_persistent==0)
 220                                 st->ss->load_super(st, tfd, &osuper, NULL);
 221                         /* will use osuper later */
 222                         close(tfd);
 223
 224                         if (array.major_version == 0 &&
 225                             md_get_version(fd)%100 < 2) {
 226                                 if (ioctl(fd, HOT_ADD_DISK,
 227                                           (unsigned long)stb.st_rdev)==0) {
 228                                         if (verbose >= 0)
 229                                                 fprintf(stderr, Name ": hot added %s\n",
 230                                                         dv->devname);
 231                                         continue;
 232                                 }
 233
 234                                 fprintf(stderr, Name ": hot add failed for %s: %s\n",
 235                                         dv->devname, strerror(errno));
 236                                 return 1;
 237                         }
 238
 239                         if (array.not_persistent == 0) {
 240
 241                                 /* need to find a sample superblock to copy, and
 242                                  * a spare slot to use
 243                                  */
 244                                 for (j=0; j<st->max_devs; j++) {
 245                                         char *dev;
 246                                         int dfd;
 247                                         disc.number = j;
 248                                         if (ioctl(fd, GET_DISK_INFO, &disc))
 249                                                 continue;
 250                                         if (disc.major==0 && disc.minor==0)
 251                                                 continue;
 252                                         if ((disc.state & 4)==0) continue; /* sync */
 253                                         /* Looks like a good device to try */
 254                                         dev = map_dev(disc.major, disc.minor, 1);
 255                                         if (!dev) continue;
 256                                         dfd = dev_open(dev, O_RDONLY);
 257                                         if (dfd < 0) continue;
 258                                         if (st->ss->load_super(st, dfd, &dsuper, NULL)) {
 259                                                 close(dfd);
 260                                                 continue;
 261                                         }
 262                                         close(dfd);
 263                                         break;
 264                                 }
 265                                 if (!dsuper) {
 266                                         fprintf(stderr, Name ": cannot find valid superblock in this array - HELP\n");
 267                                         return 1;
 268                                 }
 269                                 /* Possibly this device was recently part of the array
 270                                  * and was temporarily removed, and is now being re-added.
 271                                  * If so, we can simply re-add it.
 272                                  */
 273                                 st->ss->uuid_from_super(duuid, dsuper);
 274
 275                                 /* re-add doesn't work for version-1 superblocks
 276                                  * before 2.6.18 :-(
 277                                  */
 278                                 if (array.major_version == 1 &&
 279                                     get_linux_version() <= 2006018)
 280                                         ;
 281                                 else if (osuper) {
 282                                         st->ss->uuid_from_super(ouuid, osuper);
 283                                         if (memcmp(duuid, ouuid, sizeof(ouuid))==0) {
 284                                                 /* look close enough for now.  Kernel
 285                                                  * will worry about where a bitmap
 286                                                  * based reconstruct is possible
 287                                                  */
 288                                                 struct mdinfo mdi;
 289                                                 st->ss->getinfo_super(&mdi, osuper);
 290                                                 disc.major = major(stb.st_rdev);
 291                                                 disc.minor = minor(stb.st_rdev);
 292                                                 disc.number = mdi.disk.number;
 293                                                 disc.raid_disk = mdi.disk.raid_disk;
 294                                                 disc.state = mdi.disk.state;
 295                                                 if (ioctl(fd, ADD_NEW_DISK, &disc) == 0) {
 296                                                         if (verbose >= 0)
 297                                                                 fprintf(stderr, Name ": re-added %s\n", dv->devname);
 298                                                         continue;
 299                                                 }
 300                                                 /* fall back on normal-add */
 301                                         }
 302                                 }
 303                         }
 304                         /* in 2.6.17 and earlier, version-1 superblocks won't
 305                          * use the number we write, but will choose a free number.
 306                          * we must choose the same free number, which requires
 307                          * starting at 'raid_disks' and counting up
 308                          */
 309                         for (j = array.raid_disks; j< st->max_devs; j++) {
 310                                 disc.number = j;
 311                                 if (ioctl(fd, GET_DISK_INFO, &disc))
 312                                         break;
 313                                 if (disc.major==0 && disc.minor==0)
 314                                         break;
 315                                 if (disc.state & 8) /* removed */
 316                                         break;
 317                         }
 318                         disc.major = major(stb.st_rdev);
 319                         disc.minor = minor(stb.st_rdev);
 320                         disc.number =j;
 321                         disc.state = 0;
 322                         if (array.not_persistent==0) {
 323                                 if (dv->writemostly)
 324                                         disc.state |= 1 << MD_DISK_WRITEMOSTLY;
 325                                 st->ss->add_to_super(dsuper, &disc);
 326                                 if (st->ss->write_init_super(st, dsuper, &disc, dv->devname))
 327                                         return 1;
 328                         } else if (dv->re_add) {
 329                                 /*  this had better be raid1.
 330                                  * As we are "--re-add"ing we must find a spare slot
 331                                  * to fill.
 332                                  */
 333                                 char *used = malloc(array.raid_disks);
 334                                 memset(used, 0, array.raid_disks);
 335                                 for (j=0; j< st->max_devs; j++) {
 336                                         mdu_disk_info_t disc2;
 337                                         disc2.number = j;
 338                                         if (ioctl(fd, GET_DISK_INFO, &disc2))
 339                                                 continue;
 340                                         if (disc2.major==0 && disc2.minor==0)
 341                                                 continue;
 342                                         if (disc2.state & 8) /* removed */
 343                                                 continue;
 344                                         if (disc2.raid_disk < 0)
 345                                                 continue;
 346                                         if (disc2.raid_disk > array.raid_disks)
 347                                                 continue;
 348                                         used[disc2.raid_disk] = 1;
 349                                 }
 350                                 for (j=0 ; j<array.raid_disks; j++)
 351                                         if (!used[j]) {
 352                                                 disc.raid_disk = j;
 353                                                 disc.state |= (1<<MD_DISK_SYNC);
 354                                                 break;
 355                                         }
 356                         }
 357                         if (dv->writemostly)
 358                                 disc.state |= (1 << MD_DISK_WRITEMOSTLY);
 359                         if (ioctl(fd,ADD_NEW_DISK, &disc)) {
 360                                 fprintf(stderr, Name ": add new device failed for %s as %d: %s\n",
 361                                         dv->devname, j, strerror(errno));
 362                                 return 1;
 363                         }
 364                         if (verbose >= 0)
 365                                 fprintf(stderr, Name ": added %s\n", dv->devname);
 366                         break;
 367
 368                 case 'r':
 369                         /* hot remove */
 370                         /* FIXME check that it is a current member */
 371                         if (ioctl(fd, HOT_REMOVE_DISK, (unsigned long)stb.st_rdev)) {
 372                                 fprintf(stderr, Name ": hot remove failed for %s: %s\n",
 373                                         dv->devname, strerror(errno));
 374                                 return 1;
 375                         }
 376                         if (verbose >= 0)
 377                                 fprintf(stderr, Name ": hot removed %s\n", dv->devname);
 378                         break;
 379
 380                 case 'f': /* set faulty */
 381                         /* FIXME check current member */
 382                         if (ioctl(fd, SET_DISK_FAULTY, (unsigned long) stb.st_rdev)) {
 383                                 fprintf(stderr, Name ": set device faulty failed for %s:  %s\n",
 384                                         dv->devname, strerror(errno));
 385                                 return 1;
 386                         }
 387                         if (verbose >= 0)
 388                                 fprintf(stderr, Name ": set %s faulty in %s\n",
 389                                         dv->devname, devname);
 390                         break;
 391                 }
 392         }
 393         return 0;
 394
 395 }