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                 s->layout = default_layout(NULL, s->level, c->verbose);
  75
  76         /* We need to create the device.  It can have no name. */
  77         map_lock(&map);
  78         mdfd = create_mddev(mddev, NULL, c->autof, LOCAL,
  79                             chosen_name, 0);
  80         if (mdfd < 0) {
  81                 map_unlock(&map);
  82                 return 1;
  83         }
  84         mddev = chosen_name;
  85
  86         map_update(&map, fd2devnm(mdfd), "none", uuid, chosen_name);
  87         map_unlock(&map);
  88
  89         array.level = s->level;
  90         if (s->size == MAX_SIZE)
  91                 s->size = 0;
  92         array.size = s->size;
  93         array.nr_disks = s->raiddisks;
  94         array.raid_disks = s->raiddisks;
  95         array.md_minor = 0;
  96         if (fstat_is_blkdev(mdfd, mddev, &rdev))
  97                 array.md_minor = minor(rdev);
  98         array.not_persistent = 1;
  99         array.state = 0; /* not clean, but no errors */
 100         if (s->assume_clean)
 101                 array.state |= 1;
 102         array.active_disks = s->raiddisks - missing_disks;
 103         array.working_disks = s->raiddisks - missing_disks;
 104         array.spare_disks = 0;
 105         array.failed_disks = missing_disks;
 106         if (s->chunk == 0 && (s->level==0 || s->level==LEVEL_LINEAR))
 107                 s->chunk = 64;
 108         array.chunk_size = s->chunk*1024;
 109         array.layout = s->layout;
 110         if (md_set_array_info(mdfd, &array)) {
 111                 pr_err("md_set_array_info() failed for %s: %s\n",
 112                        mddev, strerror(errno));
 113                 goto abort;
 114         }
 115
 116         if (s->bitmap_file && strcmp(s->bitmap_file, "none") == 0)
 117                 s->bitmap_file = NULL;
 118         if (s->bitmap_file && s->level <= 0) {
 119                 pr_err("bitmaps not meaningful with level %s\n",
 120                         map_num(pers, s->level)?:"given");
 121                 goto abort;
 122         }
 123         /* now add the devices */
 124         for ((i=0), (dv = devlist) ; dv ; i++, dv=dv->next) {
 125                 mdu_disk_info_t disk;
 126                 unsigned long long dsize;
 127                 int fd;
 128
 129                 if (strcmp("missing", dv->devname) == 0)
 130                         continue;
 131                 if (!stat_is_blkdev(dv->devname, &rdev))
 132                         goto abort;
 133                 fd = open(dv->devname, O_RDONLY|O_EXCL);
 134                 if (fd < 0) {
 135                         pr_err("Cannot open %s: %s\n",
 136                                 dv->devname, strerror(errno));
 137                         goto abort;
 138                 }
 139                 if (get_dev_size(fd, NULL, &dsize) &&
 140                     (s->size == 0 || s->size == MAX_SIZE || dsize < s->size))
 141                                 s->size = dsize;
 142                 close(fd);
 143                 disk.number = i;
 144                 disk.raid_disk = i;
 145                 disk.state = (1<<MD_DISK_SYNC) | (1<<MD_DISK_ACTIVE);
 146                 if (dv->writemostly == FlagSet)
 147                         disk.state |= 1<<MD_DISK_WRITEMOSTLY;
 148                 disk.major = major(rdev);
 149                 disk.minor = minor(rdev);
 150                 if (ioctl(mdfd, ADD_NEW_DISK, &disk)) {
 151                         pr_err("ADD_NEW_DISK failed for %s: %s\n",
 152                                dv->devname, strerror(errno));
 153                         goto abort;
 154                 }
 155         }
 156         /* now to start it */
 157         if (s->bitmap_file) {
 158                 bitmap_fd = open(s->bitmap_file, O_RDWR);
 159                 if (bitmap_fd < 0) {
 160                         int major = BITMAP_MAJOR_HI;
 161 #if 0
 162                         if (s->bitmap_chunk == UnSet) {
 163                                 pr_err("%s cannot be opened.\n", s->bitmap_file);
 164                                 goto abort;
 165                         }
 166 #endif
 167                         bitmapsize = s->size >> 9; /* FIXME wrong for RAID10 */
 168                         if (CreateBitmap(s->bitmap_file, 1, NULL,
 169                                          s->bitmap_chunk, c->delay,
 170                                          s->write_behind, bitmapsize, major)) {
 171                                 goto abort;
 172                         }
 173                         bitmap_fd = open(s->bitmap_file, O_RDWR);
 174                         if (bitmap_fd < 0) {
 175                                 pr_err("%s cannot be opened.\n", s->bitmap_file);
 176                                 goto abort;
 177                         }
 178                 }
 179                 if (bitmap_fd >= 0) {
 180                         if (ioctl(mdfd, SET_BITMAP_FILE, bitmap_fd) < 0) {
 181                                 pr_err("Cannot set bitmap file for %s: %s\n",
 182                                        mddev, strerror(errno));
 183                                 goto abort;
 184                         }
 185                 }
 186         }
 187         if (ioctl(mdfd, RUN_ARRAY, &param)) {
 188                 pr_err("RUN_ARRAY failed: %s\n", strerror(errno));
 189                 if (s->chunk & (s->chunk - 1)) {
 190                         cont_err("Problem may be that chunk size is not a power of 2\n");
 191                 }
 192                 goto abort;
 193         }
 194
 195         if (c->verbose >= 0)
 196                 pr_err("array %s built and started.\n",
 197                         mddev);
 198         wait_for(mddev, mdfd);
 199         close(mdfd);
 200         return 0;
 201
 202  abort:
 203         ioctl(mdfd, STOP_ARRAY, 0);
 204         close(mdfd);
 205         return 1;
 206 }