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, struct mddev_dev *devlist,
  32           struct shape *s, struct context *c)
  33 {
  34         /* Build a linear or raid0 arrays without superblocks
  35          * We cannot really do any checks, we just do it.
  36          * For md_version < 0.90.0, we call REGISTER_DEV
  37          * with the device numbers, and then
  38          * START_MD giving the "geometry"
  39          * geometry is 0xpp00cc
  40          * where pp is personality: 1==linear, 2=raid0
  41          * cc = chunk size factor: 0==4k, 1==8k etc.
  42          */
  43         int i;
  44         dev_t rdev;
  45         int subdevs = 0, missing_disks = 0;
  46         struct mddev_dev *dv;
  47         int bitmap_fd;
  48         unsigned long long bitmapsize;
  49         int mdfd;
  50         char chosen_name[1024];
  51         int uuid[4] = {0,0,0,0};
  52         struct map_ent *map = NULL;
  53         mdu_array_info_t array;
  54         mdu_param_t param; /* not used by syscall */
  55
  56         if (s->level == UnSet) {
  57                 pr_err("a RAID level is needed to Build an array.\n");
  58                 return 1;
  59         }
  60         /* scan all devices, make sure they really are block devices */
  61         for (dv = devlist; dv; dv=dv->next) {
  62                 subdevs++;
  63                 if (strcmp("missing", dv->devname) == 0) {
  64                         missing_disks++;
  65                         continue;
  66                 }
  67                 if (!stat_is_blkdev(dv->devname, NULL))
  68                         return 1;
  69         }
  70
  71         if (s->raiddisks != subdevs) {
  72                 pr_err("requested %d devices in array but listed %d\n",
  73                         s->raiddisks, subdevs);
  74                 return 1;
  75         }
  76
  77         if (s->layout == UnSet)
  78                 switch(s->level) {
  79                 default: /* no layout */
  80                         s->layout = 0;
  81                         break;
  82                 case 10:
  83                         s->layout = 0x102; /* near=2, far=1 */
  84                         if (c->verbose > 0)
  85                                 pr_err("layout defaults to n1\n");
  86                         break;
  87                 case 5:
  88                 case 6:
  89                         s->layout = map_name(r5layout, "default");
  90                         if (c->verbose > 0)
  91                                 pr_err("layout defaults to %s\n", map_num(r5layout, s->layout));
  92                         break;
  93                 case LEVEL_FAULTY:
  94                         s->layout = map_name(faultylayout, "default");
  95
  96                         if (c->verbose > 0)
  97                                 pr_err("layout defaults to %s\n", map_num(faultylayout, s->layout));
  98                         break;
  99                 }
 100
 101         /* We need to create the device.  It can have no name. */
 102         map_lock(&map);
 103         mdfd = create_mddev(mddev, NULL, c->autof, LOCAL,
 104                             chosen_name, 0);
 105         if (mdfd < 0) {
 106                 map_unlock(&map);
 107                 return 1;
 108         }
 109         mddev = chosen_name;
 110
 111         map_update(&map, fd2devnm(mdfd), "none", uuid, chosen_name);
 112         map_unlock(&map);
 113
 114         array.level = s->level;
 115         if (s->size == MAX_SIZE)
 116                 s->size = 0;
 117         array.size = s->size;
 118         array.nr_disks = s->raiddisks;
 119         array.raid_disks = s->raiddisks;
 120         array.md_minor = 0;
 121         if (fstat_is_blkdev(mdfd, mddev, &rdev))
 122                 array.md_minor = minor(rdev);
 123         array.not_persistent = 1;
 124         array.state = 0; /* not clean, but no errors */
 125         if (s->assume_clean)
 126                 array.state |= 1;
 127         array.active_disks = s->raiddisks - missing_disks;
 128         array.working_disks = s->raiddisks - missing_disks;
 129         array.spare_disks = 0;
 130         array.failed_disks = missing_disks;
 131         if (s->chunk == 0 && (s->level==0 || s->level==LEVEL_LINEAR))
 132                 s->chunk = 64;
 133         array.chunk_size = s->chunk*1024;
 134         array.layout = s->layout;
 135         if (md_set_array_info(mdfd, &array)) {
 136                 pr_err("md_set_array_info() failed for %s: %s\n",
 137                        mddev, strerror(errno));
 138                 goto abort;
 139         }
 140
 141         if (s->bitmap_file && strcmp(s->bitmap_file, "none") == 0)
 142                 s->bitmap_file = NULL;
 143         if (s->bitmap_file && s->level <= 0) {
 144                 pr_err("bitmaps not meaningful with level %s\n",
 145                         map_num(pers, s->level)?:"given");
 146                 goto abort;
 147         }
 148         /* now add the devices */
 149         for ((i=0), (dv = devlist) ; dv ; i++, dv=dv->next) {
 150                 mdu_disk_info_t disk;
 151                 unsigned long long dsize;
 152                 int fd;
 153
 154                 if (strcmp("missing", dv->devname) == 0)
 155                         continue;
 156                 if (!stat_is_blkdev(dv->devname, &rdev))
 157                         goto abort;
 158                 fd = open(dv->devname, O_RDONLY|O_EXCL);
 159                 if (fd < 0) {
 160                         pr_err("Cannot open %s: %s\n",
 161                                 dv->devname, strerror(errno));
 162                         goto abort;
 163                 }
 164                 if (get_dev_size(fd, NULL, &dsize) &&
 165                     (s->size == 0 || s->size == MAX_SIZE || dsize < s->size))
 166                                 s->size = dsize;
 167                 close(fd);
 168                 disk.number = i;
 169                 disk.raid_disk = i;
 170                 disk.state = (1<<MD_DISK_SYNC) | (1<<MD_DISK_ACTIVE);
 171                 if (dv->writemostly == FlagSet)
 172                         disk.state |= 1<<MD_DISK_WRITEMOSTLY;
 173                 disk.major = major(rdev);
 174                 disk.minor = minor(rdev);
 175                 if (ioctl(mdfd, ADD_NEW_DISK, &disk)) {
 176                         pr_err("ADD_NEW_DISK failed for %s: %s\n",
 177                                dv->devname, strerror(errno));
 178                         goto abort;
 179                 }
 180         }
 181         /* now to start it */
 182         if (s->bitmap_file) {
 183                 bitmap_fd = open(s->bitmap_file, O_RDWR);
 184                 if (bitmap_fd < 0) {
 185                         int major = BITMAP_MAJOR_HI;
 186 #if 0
 187                         if (s->bitmap_chunk == UnSet) {
 188                                 pr_err("%s cannot be openned.", s->bitmap_file);
 189                                 goto abort;
 190                         }
 191 #endif
 192                         bitmapsize = s->size >> 9; /* FIXME wrong for RAID10 */
 193                         if (CreateBitmap(s->bitmap_file, 1, NULL,
 194                                          s->bitmap_chunk, c->delay,
 195                                          s->write_behind, bitmapsize, major)) {
 196                                 goto abort;
 197                         }
 198                         bitmap_fd = open(s->bitmap_file, O_RDWR);
 199                         if (bitmap_fd < 0) {
 200                                 pr_err("%s cannot be openned.", s->bitmap_file);
 201                                 goto abort;
 202                         }
 203                 }
 204                 if (bitmap_fd >= 0) {
 205                         if (ioctl(mdfd, SET_BITMAP_FILE, bitmap_fd) < 0) {
 206                                 pr_err("Cannot set bitmap file for %s: %s\n",
 207                                        mddev, strerror(errno));
 208                                 goto abort;
 209                         }
 210                 }
 211         }
 212         if (ioctl(mdfd, RUN_ARRAY, &param)) {
 213                 pr_err("RUN_ARRAY failed: %s\n", strerror(errno));
 214                 if (s->chunk & (s->chunk - 1)) {
 215                         cont_err("Problem may be that chunk size is not a power of 2\n");
 216                 }
 217                 goto abort;
 218         }
 219
 220         if (c->verbose >= 0)
 221                 pr_err("array %s built and started.\n",
 222                         mddev);
 223         wait_for(mddev, mdfd);
 224         close(mdfd);
 225         return 0;
 226
 227  abort:
 228         ioctl(mdfd, STOP_ARRAY, 0);
 229         close(mdfd);
 230         return 1;
 231 }