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         struct stat stb;
  45         dev_t rdev;
  46         int subdevs = 0, missing_disks = 0;
  47         struct mddev_dev *dv;
  48         int bitmap_fd;
  49         unsigned long long bitmapsize;
  50         int mdfd;
  51         char chosen_name[1024];
  52         int uuid[4] = {0,0,0,0};
  53         struct map_ent *map = NULL;
  54         mdu_array_info_t array;
  55         mdu_param_t param; /* not used by syscall */
  56
  57         if (s->level == UnSet) {
  58                 pr_err("a RAID level is needed to Build an array.\n");
  59                 return 1;
  60         }
  61         /* scan all devices, make sure they really are block devices */
  62         for (dv = devlist; dv; dv=dv->next) {
  63                 subdevs++;
  64                 if (strcmp("missing", dv->devname) == 0) {
  65                         missing_disks++;
  66                         continue;
  67                 }
  68                 if (stat(dv->devname, &stb)) {
  69                         pr_err("Cannot find %s: %s\n",
  70                                 dv->devname, strerror(errno));
  71                         return 1;
  72                 }
  73                 if ((stb.st_mode & S_IFMT) != S_IFBLK) {
  74                         pr_err("%s is not a block device.\n",
  75                                 dv->devname);
  76                         return 1;
  77                 }
  78         }
  79
  80         if (s->raiddisks != subdevs) {
  81                 pr_err("requested %d devices in array but listed %d\n",
  82                         s->raiddisks, subdevs);
  83                 return 1;
  84         }
  85
  86         if (s->layout == UnSet)
  87                 switch(s->level) {
  88                 default: /* no layout */
  89                         s->layout = 0;
  90                         break;
  91                 case 10:
  92                         s->layout = 0x102; /* near=2, far=1 */
  93                         if (c->verbose > 0)
  94                                 pr_err("layout defaults to n1\n");
  95                         break;
  96                 case 5:
  97                 case 6:
  98                         s->layout = map_name(r5layout, "default");
  99                         if (c->verbose > 0)
 100                                 pr_err("layout defaults to %s\n", map_num(r5layout, s->layout));
 101                         break;
 102                 case LEVEL_FAULTY:
 103                         s->layout = map_name(faultylayout, "default");
 104
 105                         if (c->verbose > 0)
 106                                 pr_err("layout defaults to %s\n", map_num(faultylayout, s->layout));
 107                         break;
 108                 }
 109
 110         /* We need to create the device.  It can have no name. */
 111         map_lock(&map);
 112         mdfd = create_mddev(mddev, NULL, c->autof, LOCAL,
 113                             chosen_name, 0);
 114         if (mdfd < 0) {
 115                 map_unlock(&map);
 116                 return 1;
 117         }
 118         mddev = chosen_name;
 119
 120         map_update(&map, fd2devnm(mdfd), "none", uuid, chosen_name);
 121         map_unlock(&map);
 122
 123         array.level = s->level;
 124         if (s->size == MAX_SIZE)
 125                 s->size = 0;
 126         array.size = s->size;
 127         array.nr_disks = s->raiddisks;
 128         array.raid_disks = s->raiddisks;
 129         array.md_minor = 0;
 130         if (fstat_is_blkdev(mdfd, mddev, &rdev))
 131                 array.md_minor = minor(rdev);
 132         array.not_persistent = 1;
 133         array.state = 0; /* not clean, but no errors */
 134         if (s->assume_clean)
 135                 array.state |= 1;
 136         array.active_disks = s->raiddisks - missing_disks;
 137         array.working_disks = s->raiddisks - missing_disks;
 138         array.spare_disks = 0;
 139         array.failed_disks = missing_disks;
 140         if (s->chunk == 0 && (s->level==0 || s->level==LEVEL_LINEAR))
 141                 s->chunk = 64;
 142         array.chunk_size = s->chunk*1024;
 143         array.layout = s->layout;
 144         if (md_set_array_info(mdfd, &array)) {
 145                 pr_err("md_set_array_info() failed for %s: %s\n",
 146                        mddev, strerror(errno));
 147                 goto abort;
 148         }
 149
 150         if (s->bitmap_file && strcmp(s->bitmap_file, "none") == 0)
 151                 s->bitmap_file = NULL;
 152         if (s->bitmap_file && s->level <= 0) {
 153                 pr_err("bitmaps not meaningful with level %s\n",
 154                         map_num(pers, s->level)?:"given");
 155                 goto abort;
 156         }
 157         /* now add the devices */
 158         for ((i=0), (dv = devlist) ; dv ; i++, dv=dv->next) {
 159                 mdu_disk_info_t disk;
 160                 unsigned long long dsize;
 161                 int fd;
 162
 163                 if (strcmp("missing", dv->devname) == 0)
 164                         continue;
 165                 if (stat(dv->devname, &stb)) {
 166                         pr_err("Weird: %s has disappeared.\n",
 167                                 dv->devname);
 168                         goto abort;
 169                 }
 170                 if ((stb.st_mode & S_IFMT)!= S_IFBLK) {
 171                         pr_err("Weird: %s is no longer a block device.\n",
 172                                 dv->devname);
 173                         goto abort;
 174                 }
 175                 fd = open(dv->devname, O_RDONLY|O_EXCL);
 176                 if (fd < 0) {
 177                         pr_err("Cannot open %s: %s\n",
 178                                 dv->devname, strerror(errno));
 179                         goto abort;
 180                 }
 181                 if (get_dev_size(fd, NULL, &dsize) &&
 182                     (s->size == 0 || s->size == MAX_SIZE || dsize < s->size))
 183                                 s->size = dsize;
 184                 close(fd);
 185                 disk.number = i;
 186                 disk.raid_disk = i;
 187                 disk.state = (1<<MD_DISK_SYNC) | (1<<MD_DISK_ACTIVE);
 188                 if (dv->writemostly == FlagSet)
 189                         disk.state |= 1<<MD_DISK_WRITEMOSTLY;
 190                 disk.major = major(stb.st_rdev);
 191                 disk.minor = minor(stb.st_rdev);
 192                 if (ioctl(mdfd, ADD_NEW_DISK, &disk)) {
 193                         pr_err("ADD_NEW_DISK failed for %s: %s\n",
 194                                dv->devname, strerror(errno));
 195                         goto abort;
 196                 }
 197         }
 198         /* now to start it */
 199         if (s->bitmap_file) {
 200                 bitmap_fd = open(s->bitmap_file, O_RDWR);
 201                 if (bitmap_fd < 0) {
 202                         int major = BITMAP_MAJOR_HI;
 203 #if 0
 204                         if (s->bitmap_chunk == UnSet) {
 205                                 pr_err("%s cannot be openned.", s->bitmap_file);
 206                                 goto abort;
 207                         }
 208 #endif
 209                         bitmapsize = s->size >> 9; /* FIXME wrong for RAID10 */
 210                         if (CreateBitmap(s->bitmap_file, 1, NULL,
 211                                          s->bitmap_chunk, c->delay,
 212                                          s->write_behind, bitmapsize, major)) {
 213                                 goto abort;
 214                         }
 215                         bitmap_fd = open(s->bitmap_file, O_RDWR);
 216                         if (bitmap_fd < 0) {
 217                                 pr_err("%s cannot be openned.", s->bitmap_file);
 218                                 goto abort;
 219                         }
 220                 }
 221                 if (bitmap_fd >= 0) {
 222                         if (ioctl(mdfd, SET_BITMAP_FILE, bitmap_fd) < 0) {
 223                                 pr_err("Cannot set bitmap file for %s: %s\n",
 224                                        mddev, strerror(errno));
 225                                 goto abort;
 226                         }
 227                 }
 228         }
 229         if (ioctl(mdfd, RUN_ARRAY, &param)) {
 230                 pr_err("RUN_ARRAY failed: %s\n", strerror(errno));
 231                 if (s->chunk & (s->chunk - 1)) {
 232                         cont_err("Problem may be that chunk size is not a power of 2\n");
 233                 }
 234                 goto abort;
 235         }
 236
 237         if (c->verbose >= 0)
 238                 pr_err("array %s built and started.\n",
 239                         mddev);
 240         wait_for(mddev, mdfd);
 241         close(mdfd);
 242         return 0;
 243
 244  abort:
 245         ioctl(mdfd, STOP_ARRAY, 0);
 246         close(mdfd);
 247         return 1;
 248 }