release/src/router/mdadm/Build.c

   1 /*
   2  * mdadm - manage Linux "md" devices aka RAID arrays.
   3  *
   4  * Copyright (C) 2001-2006 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@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 "mdadm.h"
  31
  32 #define REGISTER_DEV            _IO (MD_MAJOR, 1)
  33 #define START_MD                _IO (MD_MAJOR, 2)
  34 #define STOP_MD                 _IO (MD_MAJOR, 3)
  35
  36 int Build(char *mddev, int mdfd, int chunk, int level, int layout,
  37           int raiddisks,
  38           mddev_dev_t devlist, int assume_clean,
  39           char *bitmap_file, int bitmap_chunk, int write_behind, int delay, int verbose)
  40 {
  41         /* Build a linear or raid0 arrays without superblocks
  42          * We cannot really do any checks, we just do it.
  43          * For md_version < 0.90.0, we call REGISTER_DEV
  44          * with the device numbers, and then
  45          * START_MD giving the "geometry"
  46          * geometry is 0xpp00cc
  47          * where pp is personality: 1==linear, 2=raid0
  48          * cc = chunk size factor: 0==4k, 1==8k etc.
  49          *
  50          * For md_version >= 0.90.0 we call
  51          * SET_ARRAY_INFO,  ADD_NEW_DISK, RUN_ARRAY
  52          *
  53          */
  54         int i;
  55         int vers;
  56         struct stat stb;
  57         int subdevs = 0, missing_disks = 0;
  58         mddev_dev_t dv;
  59         int bitmap_fd;
  60         unsigned long long size = ~0ULL;
  61         unsigned long long bitmapsize;
  62
  63         /* scan all devices, make sure they really are block devices */
  64         for (dv = devlist; dv; dv=dv->next) {
  65                 subdevs++;
  66                 if (strcmp("missing", dv->devname) == 0) {
  67                         missing_disks++;
  68                         continue;
  69                 }
  70                 if (stat(dv->devname, &stb)) {
  71                         fprintf(stderr, Name ": Cannot find %s: %s\n",
  72                                 dv->devname, strerror(errno));
  73                         return 1;
  74                 }
  75                 if ((stb.st_mode & S_IFMT) != S_IFBLK) {
  76                         fprintf(stderr, Name ": %s is not a block device.\n",
  77                                 dv->devname);
  78                         return 1;
  79                 }
  80         }
  81
  82         if (raiddisks != subdevs) {
  83                 fprintf(stderr, Name ": requested %d devices in array but listed %d\n",
  84                         raiddisks, subdevs);
  85                 return 1;
  86         }
  87
  88         if (layout == UnSet)
  89                 switch(level) {
  90                 default: /* no layout */
  91                         layout = 0;
  92                         break;
  93                 case 10:
  94                         layout = 0x102; /* near=2, far=1 */
  95                         if (verbose > 0)
  96                                 fprintf(stderr,
  97                                         Name ": layout defaults to n1\n");
  98                         break;
  99                 case 5:
 100                 case 6:
 101                         layout = map_name(r5layout, "default");
 102                         if (verbose > 0)
 103                                 fprintf(stderr,
 104                                         Name ": layout defaults to %s\n", map_num(r5layout, layout));
 105                         break;
 106                 case LEVEL_FAULTY:
 107                         layout = map_name(faultylayout, "default");
 108
 109                         if (verbose > 0)
 110                                 fprintf(stderr,
 111                                         Name ": layout defaults to %s\n", map_num(faultylayout, layout));
 112                         break;
 113                 }
 114
 115
 116         vers = md_get_version(mdfd);
 117
 118         /* looks Ok, go for it */
 119         if (vers >= 9000) {
 120                 mdu_array_info_t array;
 121                 array.level = level;
 122                 array.size = 0;
 123                 array.nr_disks = raiddisks;
 124                 array.raid_disks = raiddisks;
 125                 array.md_minor = 0;
 126                 if (fstat(mdfd, &stb)==0)
 127                         array.md_minor = minor(stb.st_rdev);
 128                 array.not_persistent = 1;
 129                 array.state = 0; /* not clean, but no errors */
 130                 if (assume_clean)
 131                         array.state |= 1;
 132                 array.active_disks = raiddisks - missing_disks;
 133                 array.working_disks = raiddisks - missing_disks;
 134                 array.spare_disks = 0;
 135                 array.failed_disks = missing_disks;
 136                 if (chunk == 0 && (level==0 || level==LEVEL_LINEAR))
 137                         chunk = 64;
 138                 array.chunk_size = chunk*1024;
 139                 array.layout = layout;
 140                 if (ioctl(mdfd, SET_ARRAY_INFO, &array)) {
 141                         fprintf(stderr, Name ": SET_ARRAY_INFO failed for %s: %s\n",
 142                                 mddev, strerror(errno));
 143                         return 1;
 144                 }
 145         } else if (bitmap_file) {
 146                 fprintf(stderr, Name ": bitmaps not supported with this kernel\n");
 147                 return 1;
 148         }
 149         /* now add the devices */
 150         for ((i=0), (dv = devlist) ; dv ; i++, dv=dv->next) {
 151                 unsigned long long dsize;
 152                 int fd;
 153                 if (strcmp("missing", dv->devname) == 0)
 154                         continue;
 155                 if (stat(dv->devname, &stb)) {
 156                         fprintf(stderr, Name ": Weird: %s has disappeared.\n",
 157                                 dv->devname);
 158                         goto abort;
 159                 }
 160                 if ((stb.st_mode & S_IFMT)!= S_IFBLK) {
 161                         fprintf(stderr, Name ": Wierd: %s is no longer a block device.\n",
 162                                 dv->devname);
 163                         goto abort;
 164                 }
 165                 fd = open(dv->devname, O_RDONLY|O_EXCL);
 166                 if (fd < 0) {
 167                         fprintf(stderr, Name ": Cannot open %s: %s\n",
 168                                 dv->devname, strerror(errno));
 169                         goto abort;
 170                 }
 171                 if (get_dev_size(fd, NULL, &dsize) &&
 172                     (size == 0 || dsize < size))
 173                                 size = dsize;
 174                 close(fd);
 175                 if (vers>= 9000) {
 176                         mdu_disk_info_t disk;
 177                         disk.number = i;
 178                         disk.raid_disk = i;
 179                         disk.state = (1<<MD_DISK_SYNC) | (1<<MD_DISK_ACTIVE);
 180                         if (dv->writemostly)
 181                                 disk.state |= 1<<MD_DISK_WRITEMOSTLY;
 182                         disk.major = major(stb.st_rdev);
 183                         disk.minor = minor(stb.st_rdev);
 184                         if (ioctl(mdfd, ADD_NEW_DISK, &disk)) {
 185                                 fprintf(stderr, Name ": ADD_NEW_DISK failed for %s: %s\n",
 186                                         dv->devname, strerror(errno));
 187                                 goto abort;
 188                         }
 189                 } else {
 190                         if (ioctl(mdfd, REGISTER_DEV, &stb.st_rdev)) {
 191                                 fprintf(stderr, Name ": REGISTER_DEV failed for %s: %s.\n",
 192                                         dv->devname, strerror(errno));
 193                                 goto abort;
 194                         }
 195                 }
 196         }
 197         /* now to start it */
 198         if (vers >= 9000) {
 199                 mdu_param_t param; /* not used by syscall */
 200                 if (bitmap_file) {
 201                         bitmap_fd = open(bitmap_file, O_RDWR);
 202                         if (bitmap_fd < 0) {
 203                                 int major = BITMAP_MAJOR_HI;
 204 #if 0
 205                                 if (bitmap_chunk == UnSet) {
 206                                         fprintf(stderr, Name ": %s cannot be openned.",
 207                                                 bitmap_file);
 208                                         return 1;
 209                                 }
 210 #endif
 211                                 if (vers < 9003) {
 212                                         major = BITMAP_MAJOR_HOSTENDIAN;
 213 #ifdef __BIG_ENDIAN
 214                                         fprintf(stderr, Name ": Warning - bitmaps created on this kernel are not portable\n"
 215                                                 "  between different architectures.  Consider upgrading the Linux kernel.\n");
 216 #endif
 217                                 }
 218                                 bitmapsize = size>>9; /* FIXME wrong for RAID10 */
 219                                 if (CreateBitmap(bitmap_file, 1, NULL, bitmap_chunk,
 220                                                  delay, write_behind, bitmapsize, major)) {
 221                                         return 1;
 222                                 }
 223                                 bitmap_fd = open(bitmap_file, O_RDWR);
 224                                 if (bitmap_fd < 0) {
 225                                         fprintf(stderr, Name ": %s cannot be openned.",
 226                                                 bitmap_file);
 227                                         return 1;
 228                                 }
 229                         }
 230                         if (bitmap_fd >= 0) {
 231                                 if (ioctl(mdfd, SET_BITMAP_FILE, bitmap_fd) < 0) {
 232                                         fprintf(stderr, Name ": Cannot set bitmap file for %s: %s\n",
 233                                                 mddev, strerror(errno));
 234                                         return 1;
 235                                 }
 236                         }
 237                 }
 238                 if (ioctl(mdfd, RUN_ARRAY, &param)) {
 239                         fprintf(stderr, Name ": RUN_ARRAY failed: %s\n",
 240                                 strerror(errno));
 241                         goto abort;
 242                 }
 243         } else {
 244                 unsigned long arg;
 245                 arg=0;
 246                 while (chunk > 4096) {
 247                         arg++;
 248                         chunk >>= 1;
 249                 }
 250                 if (level == 0)
 251                         chunk |= 0x20000;
 252                 else    chunk |= 0x10000;
 253                 if (ioctl(mdfd, START_MD, arg)) {
 254                         fprintf(stderr, Name ": START_MD failed: %s\n",
 255                                 strerror(errno));
 256                         goto abort;
 257                 }
 258         }
 259         if (verbose >= 0)
 260                 fprintf(stderr, Name ": array %s built and started.\n",
 261                         mddev);
 262         return 0;
 263
 264  abort:
 265         if (vers >= 9000)
 266             ioctl(mdfd, STOP_ARRAY, 0);
 267         else
 268             ioctl(mdfd, STOP_MD, 0);
 269         return 1;
 270
 271 }