Manage.c

   1 /*
   2  * mdadm - manage Linux "md" devices aka RAID arrays.
   3  *
   4  * Copyright (C) 2001-2002 Neil Brown <neilb@cse.unsw.edu.au>
   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 #include "md_u.h"
  32 #include "md_p.h"
  33
  34 #define REGISTER_DEV            _IO (MD_MAJOR, 1)
  35 #define START_MD                _IO (MD_MAJOR, 2)
  36 #define STOP_MD                 _IO (MD_MAJOR, 3)
  37
  38 int Manage_ro(char *devname, int fd, int readonly)
  39 {
  40         /* switch to readonly or rw
  41          *
  42          * requires >= 0.90.0
  43          * first check that array is runing
  44          * use RESTART_ARRAY_RW or STOP_ARRAY_RO
  45          *
  46          */
  47         mdu_array_info_t array;
  48
  49         if (md_get_version(fd) < 9000) {
  50                 fprintf(stderr, Name ": need md driver version 0.90.0 or later\n");
  51                 return 1;
  52         }
  53         if (ioctl(fd, GET_ARRAY_INFO, &array)) {
  54                 fprintf(stderr, Name ": %s does not appear to be active.\n",
  55                         devname);
  56                 return 1;
  57         }
  58
  59         if (readonly>0) {
  60                 if (ioctl(fd, STOP_ARRAY_RO, NULL)) {
  61                         fprintf(stderr, Name ": failed to set readonly for %s: %s\n",
  62                                 devname, strerror(errno));
  63                         return 1;
  64                 }
  65         } else if (readonly < 0) {
  66                 if (ioctl(fd, RESTART_ARRAY_RW, NULL)) {
  67                         fprintf(stderr, Name ": failed to set writable for %s: %s\n",
  68                                 devname, strerror(errno));
  69                         return 1;
  70                 }
  71         }
  72         return 0;
  73 }
  74
  75 int Manage_runstop(char *devname, int fd, int runstop)
  76 {
  77         /* Run or stop the array. array must already be configured
  78          * required >= 0.90.0
  79          */
  80         mdu_param_t param; /* unused */
  81
  82         if (runstop == -1 && md_get_version(fd) < 9000) {
  83                 if (ioctl(fd, STOP_MD, 0)) {
  84                         fprintf(stderr, Name ": stopping device %s failed: %s\n",
  85                                 devname, strerror(errno));
  86                         return 1;
  87                 }
  88         }
  89
  90         if (md_get_version(fd) < 9000) {
  91                 fprintf(stderr, Name ": need md driver version 0.90.0 or later\n");
  92                 return 1;
  93         }
  94         /*
  95         if (ioctl(fd, GET_ARRAY_INFO, &array)) {
  96                 fprintf(stderr, Name ": %s does not appear to be active.\n",
  97                         devname);
  98                 return 1;
  99         }
 100         */
 101         if (runstop>0) {
 102                 if (ioctl(fd, RUN_ARRAY, &param)) {
 103                         fprintf(stderr, Name ": failed to run array %s: %s\n",
 104                                 devname, strerror(errno));
 105                         return 1;
 106                 }
 107         } else if (runstop < 0){
 108                 if (ioctl(fd, STOP_ARRAY, NULL)) {
 109                         fprintf(stderr, Name ": fail to stop array %s: %s\n",
 110                                 devname, strerror(errno));
 111                         return 1;
 112                 }
 113         }
 114         return 0;
 115 }
 116
 117 int Manage_resize(char *devname, int fd, long long size, int raid_disks)
 118 {
 119         mdu_array_info_t info;
 120         if (ioctl(fd, GET_ARRAY_INFO, &info) != 0) {
 121                 fprintf(stderr, Name ": Cannot get array information for %s: %s\n",
 122                         devname, strerror(errno));
 123                 return 1;
 124         }
 125         if (size >= 0)
 126                 info.size = size;
 127         if (raid_disks > 0)
 128                 info.raid_disks = raid_disks;
 129         if (ioctl(fd, SET_ARRAY_INFO, &info) != 0) {
 130                 fprintf(stderr, Name ": Cannot set device size/shape for %s: %s\n",
 131                         devname, strerror(errno));
 132                 return 1;
 133         }
 134         return 0;
 135 }
 136
 137 int Manage_reconfig(char *devname, int fd, int layout)
 138 {
 139         mdu_array_info_t info;
 140         if (ioctl(fd, GET_ARRAY_INFO, &info) != 0) {
 141                 fprintf(stderr, Name ": Cannot get array information for %s: %s\n",
 142                         devname, strerror(errno));
 143                 return 1;
 144         }
 145         info.layout = layout;
 146         printf("layout set to %d\n", info.layout);
 147         if (ioctl(fd, SET_ARRAY_INFO, &info) != 0) {
 148                 fprintf(stderr, Name ": Cannot set layout for %s: %s\n",
 149                         devname, strerror(errno));
 150                 return 1;
 151         }
 152         return 0;
 153 }
 154
 155 int Manage_subdevs(char *devname, int fd,
 156                    mddev_dev_t devlist)
 157 {
 158         /* do something to each dev.
 159          * devmode can be
 160          *  'a' - add the device
 161          *         try HOT_ADD_DISK
 162          *         If that fails EINVAL, try ADD_NEW_DISK
 163          *  'r' - remove the device HOT_REMOVE_DISK
 164          *  'f' - set the device faulty SET_DISK_FAULTY
 165          */
 166         mdu_array_info_t array;
 167         mdu_disk_info_t disc;
 168         mddev_dev_t dv;
 169         struct stat stb;
 170         int j;
 171         int save_errno;
 172         static char buf[4096];
 173
 174         if (ioctl(fd, GET_ARRAY_INFO, &array)) {
 175                 fprintf(stderr, Name ": cannot get array info for %s\n",
 176                         devname);
 177                 return 1;
 178         }
 179         for (dv = devlist ; dv; dv=dv->next) {
 180                 if (stat(dv->devname, &stb)) {
 181                         fprintf(stderr, Name ": cannot find %s: %s\n",
 182                                 dv->devname, strerror(errno));
 183                         return 1;
 184                 }
 185                 if ((stb.st_mode & S_IFMT) != S_IFBLK) {
 186                         fprintf(stderr, Name ": %s is not a block device.\n",
 187                                 dv->devname);
 188                         return 1;
 189                 }
 190                 switch(dv->disposition){
 191                 default:
 192                         fprintf(stderr, Name ": internal error - devmode[%s]=%d\n",
 193                                 dv->devname, dv->disposition);
 194                         return 1;
 195                 case 'a':
 196                         /* add the device - hot or cold */
 197                         if (ioctl(fd, HOT_ADD_DISK, (unsigned long)stb.st_rdev)==0) {
 198                                 fprintf(stderr, Name ": hot added %s\n",
 199                                         dv->devname);
 200                                 continue;
 201                         }
 202                         save_errno = errno;
 203                         if (read(fd, buf, sizeof(buf)) > 0) {
 204                                 /* array is active, so don't try to add.
 205                                  * i.e. something is wrong
 206                                  */
 207                                 fprintf(stderr, Name ": hot add failed for %s: %s\n",
 208                                         dv->devname, strerror(save_errno));
 209                                 return 1;
 210                         }
 211                         /* try ADD_NEW_DISK.
 212                          * we might be creating, we might be assembling,
 213                          * it is hard to tell.
 214                          * set up number/raid_disk/state just
 215                          * in case
 216                          */
 217                         for (j=0; j<array.nr_disks; j++) {
 218                                 disc.number = j;
 219                                 if (ioctl(fd, GET_DISK_INFO, &disc))
 220                                         break;
 221                                 if (disc.major==0 && disc.minor==0)
 222                                         break;
 223                                 if (disc.state & 8) /* removed */
 224                                         break;
 225                         }
 226                         disc.number =j;
 227                         disc.raid_disk = j;
 228                         disc.state = 0;
 229                         disc.major = MAJOR(stb.st_rdev);
 230                         disc.minor = MINOR(stb.st_rdev);
 231                         if (ioctl(fd,ADD_NEW_DISK, &disc)) {
 232                                 fprintf(stderr, Name ": add new device failed for %s: %s\n",
 233                                         dv->devname, strerror(errno));
 234                                 return 1;
 235                         }
 236                         fprintf(stderr, Name ": added %s\n", dv->devname);
 237                         break;
 238
 239                 case 'r':
 240                         /* hot remove */
 241                         /* FIXME check that it is a current member */
 242                         if (ioctl(fd, HOT_REMOVE_DISK, (unsigned long)stb.st_rdev)) {
 243                                 fprintf(stderr, Name ": hot remove failed for %s: %s\n",
 244                                         dv->devname, strerror(errno));
 245                                 return 1;
 246                         }
 247                         fprintf(stderr, Name ": hot removed %s\n", dv->devname);
 248                         break;
 249
 250                 case 'f': /* set faulty */
 251                         /* FIXME check current member */
 252                         if (ioctl(fd, SET_DISK_FAULTY, (unsigned long) stb.st_rdev)) {
 253                                 fprintf(stderr, Name ": set device faulty failed for %s:  %s\n",
 254                                         dv->devname, strerror(errno));
 255                                 return 1;
 256                         }
 257                         fprintf(stderr, Name ": set %s faulty in %s\n",
 258                                 dv->devname, devname);
 259                         break;
 260                 }
 261         }
 262         return 0;
 263
 264 }