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 int Build(char *mddev, struct mddev_dev *devlist,
  28           struct shape *s, struct context *c)
  29 {
  30         /* Build a linear or raid0 arrays without superblocks
  31          * We cannot really do any checks, we just do it.
  32          * For md_version < 0.90.0, we call REGISTER_DEV
  33          * with the device numbers, and then
  34          * START_MD giving the "geometry"
  35          * geometry is 0xpp00cc
  36          * where pp is personality: 1==linear, 2=raid0
  37          * cc = chunk size factor: 0==4k, 1==8k etc.
  38          */
  39         int i;
  40         dev_t rdev;
  41         int subdevs = 0, missing_disks = 0;
  42         struct mddev_dev *dv;
  43         int bitmap_fd;
  44         unsigned long long bitmapsize;
  45         int mdfd;
  46         char chosen_name[1024];
  47         int uuid[4] = {0,0,0,0};
  48         struct map_ent *map = NULL;
  49         mdu_array_info_t array;
  50         mdu_param_t param; /* not used by syscall */
  51
  52         if (s->level == UnSet) {
  53                 pr_err("a RAID level is needed to Build an array.\n");
  54                 return 1;
  55         }
  56         /* scan all devices, make sure they really are block devices */
  57         for (dv = devlist; dv; dv=dv->next) {
  58                 subdevs++;
  59                 if (strcmp("missing", dv->devname) == 0) {
  60                         missing_disks++;
  61                         continue;
  62                 }
  63                 if (!stat_is_blkdev(dv->devname, NULL))
  64                         return 1;
  65         }
  66
  67         if (s->raiddisks != subdevs) {
  68                 pr_err("requested %d devices in array but listed %d\n",
  69                         s->raiddisks, subdevs);
  70                 return 1;
  71         }
  72
  73         if (s->layout == UnSet)
  74                 switch(s->level) {
  75                 default: /* no layout */
  76                         s->layout = 0;
  77                         break;
  78                 case 10:
  79                         s->layout = 0x102; /* near=2, far=1 */
  80                         if (c->verbose > 0)
  81                                 pr_err("layout defaults to n1\n");
  82                         break;
  83                 case 5:
  84                 case 6:
  85                         s->layout = map_name(r5layout, "default");
  86                         if (c->verbose > 0)
  87                                 pr_err("layout defaults to %s\n", map_num(r5layout, s->layout));
  88                         break;
  89                 case LEVEL_FAULTY:
  90                         s->layout = map_name(faultylayout, "default");
  91
  92                         if (c->verbose > 0)
  93                                 pr_err("layout defaults to %s\n", map_num(faultylayout, s->layout));
  94                         break;
  95                 }
  96
  97         /* We need to create the device.  It can have no name. */
  98         map_lock(&map);
  99         mdfd = create_mddev(mddev, NULL, c->autof, LOCAL,
 100                             chosen_name, 0);
 101         if (mdfd < 0) {
 102                 map_unlock(&map);
 103                 return 1;
 104         }
 105         mddev = chosen_name;
 106
 107         map_update(&map, fd2devnm(mdfd), "none", uuid, chosen_name);
 108         map_unlock(&map);
 109
 110         array.level = s->level;
 111         if (s->size == MAX_SIZE)
 112                 s->size = 0;
 113         array.size = s->size;
 114         array.nr_disks = s->raiddisks;
 115         array.raid_disks = s->raiddisks;
 116         array.md_minor = 0;
 117         if (fstat_is_blkdev(mdfd, mddev, &rdev))
 118                 array.md_minor = minor(rdev);
 119         array.not_persistent = 1;
 120         array.state = 0; /* not clean, but no errors */
 121         if (s->assume_clean)
 122                 array.state |= 1;
 123         array.active_disks = s->raiddisks - missing_disks;
 124         array.working_disks = s->raiddisks - missing_disks;
 125         array.spare_disks = 0;
 126         array.failed_disks = missing_disks;
 127         if (s->chunk == 0 && (s->level==0 || s->level==LEVEL_LINEAR))
 128                 s->chunk = 64;
 129         array.chunk_size = s->chunk*1024;
 130         array.layout = s->layout;
 131         if (md_set_array_info(mdfd, &array)) {
 132                 pr_err("md_set_array_info() failed for %s: %s\n",
 133                        mddev, strerror(errno));
 134                 goto abort;
 135         }
 136
 137         if (s->bitmap_file && strcmp(s->bitmap_file, "none") == 0)
 138                 s->bitmap_file = NULL;
 139         if (s->bitmap_file && s->level <= 0) {
 140                 pr_err("bitmaps not meaningful with level %s\n",
 141                         map_num(pers, s->level)?:"given");
 142                 goto abort;
 143         }
 144         /* now add the devices */
 145         for ((i=0), (dv = devlist) ; dv ; i++, dv=dv->next) {
 146                 mdu_disk_info_t disk;
 147                 unsigned long long dsize;
 148                 int fd;
 149
 150                 if (strcmp("missing", dv->devname) == 0)
 151                         continue;
 152                 if (!stat_is_blkdev(dv->devname, &rdev))
 153                         goto abort;
 154                 fd = open(dv->devname, O_RDONLY|O_EXCL);
 155                 if (fd < 0) {
 156                         pr_err("Cannot open %s: %s\n",
 157                                 dv->devname, strerror(errno));
 158                         goto abort;
 159                 }
 160                 if (get_dev_size(fd, NULL, &dsize) &&
 161                     (s->size == 0 || s->size == MAX_SIZE || dsize < s->size))
 162                                 s->size = dsize;
 163                 close(fd);
 164                 disk.number = i;
 165                 disk.raid_disk = i;
 166                 disk.state = (1<<MD_DISK_SYNC) | (1<<MD_DISK_ACTIVE);
 167                 if (dv->writemostly == FlagSet)
 168                         disk.state |= 1<<MD_DISK_WRITEMOSTLY;
 169                 disk.major = major(rdev);
 170                 disk.minor = minor(rdev);
 171                 if (ioctl(mdfd, ADD_NEW_DISK, &disk)) {
 172                         pr_err("ADD_NEW_DISK failed for %s: %s\n",
 173                                dv->devname, strerror(errno));
 174                         goto abort;
 175                 }
 176         }
 177         /* now to start it */
 178         if (s->bitmap_file) {
 179                 bitmap_fd = open(s->bitmap_file, O_RDWR);
 180                 if (bitmap_fd < 0) {
 181                         int major = BITMAP_MAJOR_HI;
 182 #if 0
 183                         if (s->bitmap_chunk == UnSet) {
 184                                 pr_err("%s cannot be opened.\n", s->bitmap_file);
 185                                 goto abort;
 186                         }
 187 #endif
 188                         bitmapsize = s->size >> 9; /* FIXME wrong for RAID10 */
 189                         if (CreateBitmap(s->bitmap_file, 1, NULL,
 190                                          s->bitmap_chunk, c->delay,
 191                                          s->write_behind, bitmapsize, major)) {
 192                                 goto abort;
 193                         }
 194                         bitmap_fd = open(s->bitmap_file, O_RDWR);
 195                         if (bitmap_fd < 0) {
 196                                 pr_err("%s cannot be opened.\n", s->bitmap_file);
 197                                 goto abort;
 198                         }
 199                 }
 200                 if (bitmap_fd >= 0) {
 201                         if (ioctl(mdfd, SET_BITMAP_FILE, bitmap_fd) < 0) {
 202                                 pr_err("Cannot set bitmap file for %s: %s\n",
 203                                        mddev, strerror(errno));
 204                                 goto abort;
 205                         }
 206                 }
 207         }
 208         if (ioctl(mdfd, RUN_ARRAY, &param)) {
 209                 pr_err("RUN_ARRAY failed: %s\n", strerror(errno));
 210                 if (s->chunk & (s->chunk - 1)) {
 211                         cont_err("Problem may be that chunk size is not a power of 2\n");
 212                 }
 213                 goto abort;
 214         }
 215
 216         if (c->verbose >= 0)
 217                 pr_err("array %s built and started.\n",
 218                         mddev);
 219         wait_for(mddev, mdfd);
 220         close(mdfd);
 221         return 0;
 222
 223  abort:
 224         ioctl(mdfd, STOP_ARRAY, 0);
 225         close(mdfd);
 226         return 1;
 227 }