Create.c

   1 /*
   2  * mdctl - manage Linux "md" devices aka RAID arrays.
   3  *
   4  * Copyright (C) 2001 Neil Brown <neilb@cse.unsw.edu.au>
   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 "mdctl.h"
  31 #include        "md_u.h"
  32 #include        "md_p.h"
  33
  34 int Create(char *mddev, int mdfd,
  35            int chunk, int level, int layout, int size, int raiddisks, int sparedisks,
  36            int subdevs, char *subdev[],
  37            int runstop, int verbose)
  38 {
  39         /*
  40          * Create a new raid array.
  41          *
  42          * First check that necessary details are available
  43          * (i.e. level, raid-disks)
  44          *
  45          * Then check each disk to see what might be on it
  46          * and report anything interesting.
  47          *
  48          * If anything looks odd, and runstop not set,
  49          * abort.
  50          *
  51          * SET_ARRAY_INFO and ADD_NEW_DISK, and
  52          * if runstop==run, or raiddisks diskswere used,
  53          * RUN_ARRAY
  54          */
  55         int minsize, maxsize;
  56         int maxdisc= -1, mindisc = -1;
  57         int i;
  58         int fail=0, warn=0;
  59         struct stat stb;
  60
  61         mdu_array_info_t array;
  62
  63
  64         if (md_get_version(mdfd) < 9000) {
  65             fprintf(stderr, Name ": Create requires md driver verison 0.90.0 or later\n");
  66             return 1;
  67         }
  68         if (level == -10) {
  69                 fprintf(stderr,
  70                         Name ": a RAID level is needed to create an array.\n");
  71                 return 1;
  72         }
  73         if (raiddisks < 1) {
  74                 fprintf(stderr,
  75                         Name ": a number of --raid-disks must be given to create an array\n");
  76                 return 1;
  77         }
  78         if (raiddisks+sparedisks > MD_SB_DISKS) {
  79                 fprintf(stderr,
  80                         Name ": too many discs requested: %d+%d > %d\n",
  81                         raiddisks, sparedisks, MD_SB_DISKS);
  82                 return 1;
  83         }
  84         if (subdevs > raiddisks+sparedisks) {
  85             fprintf(stderr, Name ": You have listed more disks (%d) than are in the array(%d)!\n", subdevs, raiddisks+sparedisks);
  86             return 1;
  87         }
  88         /* now set some defaults */
  89         if (layout == -1)
  90                 switch(level) {
  91                 default: /* no layout */
  92                         layout = 0;
  93                         break;
  94                 case 5:
  95                         layout = map_name(r5layout, "default");
  96                         if (verbose)
  97                                 fprintf(stderr,
  98                                         Name ": layout defaults to %s\n", map_num(r5layout, layout));
  99                         break;
 100                 }
 101
 102         if (chunk == 0) {
 103                 chunk = 64;
 104                 if (verbose)
 105                         fprintf(stderr, Name ": chunk size defaults to 64K\n");
 106         }
 107
 108         /* now look at the subdevs */
 109         for (i=0; i<subdevs; i++) {
 110                 char *dname = subdev[i];
 111                 int dsize, freesize;
 112                 int fd = open(dname, O_RDONLY, 0);
 113                 if (fd <0 ) {
 114                         fprintf(stderr, Name ": Cannot open %s: %s\n",
 115                                 dname, strerror(errno));
 116                         fail=1;
 117                         continue;
 118                 }
 119                 if (ioctl(fd, BLKGETSIZE, &dsize)) {
 120                         fprintf(stderr, Name ": Cannot get size of %s: %s\n",
 121                                 dname, strerror(errno));
 122                         fail = 1;
 123                         close(fd);
 124                         continue;
 125                 }
 126                 if (dsize < MD_RESERVED_SECTORS*2) {
 127                     fprintf(stderr, Name ": %s is too small: %dK\n",
 128                             dname, dsize/2);
 129                     fail = 1;
 130                     close(fd);
 131                     continue;
 132                 }
 133                 freesize = MD_NEW_SIZE_SECTORS(dsize);
 134                 freesize /= 2;
 135
 136                 if (size && freesize < size) {
 137                     fprintf(stderr, Name ": %s is smaller that given size."
 138                             " %dK < %dK + superblock\n", dname, freesize, size);
 139                     fail = 1;
 140                     close(fd);
 141                     continue;
 142                 }
 143                 if (maxdisc< 0 || (maxdisc>=0 && freesize > maxsize)) {
 144                     maxdisc = i;
 145                     maxsize = freesize;
 146                 }
 147                 if (mindisc < 0 || (mindisc >=0 && freesize < minsize)) {
 148                     mindisc = i;
 149                     minsize = freesize;
 150                 }
 151                 warn |= check_ext2(fd, dname);
 152                 warn |= check_reiser(fd, dname);
 153                 warn |= check_raid(fd, dname);
 154                 close(fd);
 155         }
 156         if (fail) {
 157             fprintf(stderr, Name ": create aborted\n");
 158             return 1;
 159         }
 160         if (size == 0) {
 161             if (mindisc == -1) {
 162                 fprintf(stderr, Name ": no size and no drives given - aborting create.\n");
 163                 return 1;
 164             }
 165             size = minsize;
 166             if (verbose)
 167                 fprintf(stderr, Name ": size set to %dK\n", size);
 168         }
 169         if ((maxsize-size)*100 > maxsize) {
 170             fprintf(stderr, Name ": largest drive (%s) exceed size (%dK) by more than 1%\n",
 171                     subdev[maxdisc], size);
 172             warn = 1;
 173         }
 174
 175         if (warn) {
 176             if (runstop!= 1) {
 177                 if (!ask("Continue creating array? ")) {
 178                     fprintf(stderr, Name ": create aborted.\n");
 179                     return 1;
 180                 }
 181             } else {
 182                 if (verbose)
 183                     fprintf(stderr, Name ": creation continuing despite oddities due to --run\n");
 184             }
 185         }
 186
 187         /* Ok, lets try some ioctls */
 188
 189         array.level = level;
 190         array.size = size;
 191         array.nr_disks = raiddisks+sparedisks+(level==4||level==5);
 192         array.raid_disks = raiddisks;
 193         /* The kernel should *know* what md_minor we are dealing
 194          * with, but it chooses to trust me instead. Sigh
 195          */
 196         array.md_minor = 0;
 197         if (fstat(mdfd, &stb)==0)
 198                 array.md_minor = MINOR(stb.st_rdev);
 199         array.not_persistent = 0;
 200         if (level == 4 || level == 5)
 201             array.state = 1; /* clean, but one drive will be missing */
 202         else
 203             array.state = 0; /* not clean, but no errors */
 204
 205         /* There is lots of redundancy in these disk counts,
 206          * raid_disks is the most meaningful value
 207          *          it describes the geometry of the array
 208          *          it is constant
 209          * nr_disks is total number of used slots.
 210          *          it should be raid_disks+spare_disks
 211          * spare_disks is the number of extra disks present
 212          *          see above
 213          * active_disks is the number of working disks in
 214          *          active slots. (With raid_disks)
 215          * working_disks is the total number of working disks,
 216          *          including spares
 217          * failed_disks is the number of disks marked failed
 218          *
 219          * Ideally, the kernel would keep these (except raid_disks)
 220          * up-to-date as we ADD_NEW_DISK, but it doesn't (yet).
 221          * So for now, we assume that all raid and spare
 222          * devices will be given.
 223          */
 224         array.active_disks=raiddisks-(level==4||level==5);
 225         array.working_disks=raiddisks+sparedisks;
 226         array.spare_disks=sparedisks + (level==4||level==5);
 227         array.failed_disks=0;
 228         array.layout = layout;
 229         array.chunk_size = chunk*1024;
 230
 231         if (ioctl(mdfd, SET_ARRAY_INFO, &array)) {
 232             fprintf(stderr, Name ": SET_ARRAY_INFO failed for %s: %s\n",
 233                     mddev, strerror(errno));
 234             return 1;
 235         }
 236
 237         for (i=0; i<subdevs; i++) {
 238             int fd = open(subdev[i], O_RDONLY, 0);
 239             struct stat stb;
 240             mdu_disk_info_t disk;
 241             if (fd < 0) {
 242                 fprintf(stderr, Name ": failed to open %s after earlier success - aborting\n",
 243                         subdev[i]);
 244                 return 1;
 245             }
 246             fstat(fd, &stb);
 247             disk.number = i;
 248             if ((level==4 || level==5) &&
 249                 disk.number >= raiddisks-1)
 250                 disk.number++;
 251             disk.raid_disk = disk.number;
 252             if (disk.raid_disk < raiddisks)
 253                 disk.state = 6; /* active and in sync */
 254             else
 255                 disk.state = 0;
 256             disk.major = MAJOR(stb.st_rdev);
 257             disk.minor = MINOR(stb.st_rdev);
 258             close(fd);
 259             if (ioctl(mdfd, ADD_NEW_DISK, &disk)) {
 260                 fprintf(stderr, Name ": ADD_NEW_DISK for %s failed: %s\n",
 261                         subdev[i], strerror(errno));
 262                 return 1;
 263             }
 264         }
 265
 266         /* hack */
 267         if (level==4 || level==5) {
 268                 mdu_disk_info_t disk;
 269                 disk.number = raiddisks-1;
 270                 disk.raid_disk = disk.number;
 271                 disk.state = 1; /* faulty */
 272                 disk.major = disk.minor = 0;
 273                 ioctl(mdfd,ADD_NEW_DISK, &disk);
 274         }
 275
 276         /* param is not actually used */
 277         if (runstop == 1 || subdevs >= raiddisks) {
 278                 mdu_param_t param;
 279                 if (ioctl(mdfd, RUN_ARRAY, &param)) {
 280                         fprintf(stderr, Name ": RUN_ARRAY failed: %s\n",
 281                                 strerror(errno));
 282                         return 1;
 283                 }
 284                 fprintf(stderr, Name ": array %s started.\n", mddev);
 285         } else {
 286                 fprintf(stderr, Name ": not starting array - not enough discs.\n");
 287         }
 288         return 0;
 289 }