Manage.c

   1 /*
   2  * mdctl - manage Linux "md" devices aka RAID arrays.
   3  *
   4  * Copyright (C) 2001 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 "mdctl.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_array_info_t array;
  81         mdu_param_t param; /* unused */
  82
  83         if (runstop == -1 && md_get_version(fd) < 9000) {
  84                 if (ioctl(fd, STOP_MD, 0)) {
  85                         fprintf(stderr, Name ": stopping device %s failed: %s\n",
  86                                 devname, strerror(errno));
  87                         return 1;
  88                 }
  89         }
  90
  91         if (md_get_version(fd) < 9000) {
  92                 fprintf(stderr, Name ": need md driver version 0.90.0 or later\n");
  93                 return 1;
  94         }
  95         /*
  96         if (ioctl(fd, GET_ARRAY_INFO, &array)) {
  97                 fprintf(stderr, Name ": %s does not appear to be active.\n",
  98                         devname);
  99                 return 1;
 100         }
 101         */
 102         if (runstop>0) {
 103                 if (ioctl(fd, RUN_ARRAY, &param)) {
 104                         fprintf(stderr, Name ": failed to run array %s: %s\n",
 105                                 devname, strerror(errno));
 106                         return 1;
 107                 }
 108         } else if (runstop < 0){
 109                 if (ioctl(fd, STOP_ARRAY, NULL)) {
 110                         fprintf(stderr, Name ": fail to re writable for %s: %s\n",
 111                                 devname, strerror(errno));
 112                         return 1;
 113                 }
 114         }
 115         return 0;
 116 }
 117
 118 int Manage_subdevs(char *devname, int fd,
 119                    int devcnt, char *devnames[], int devmodes[])
 120  {
 121         /* do something to each dev.
 122          * devmode can be
 123          *  'a' - add the device
 124          *         try HOT_ADD_DISK
 125          *         If that fails EINVAL, try ADD_NEW_DISK
 126          *  'r' - remove the device HOT_REMOVE_DISK
 127          *  'f' - set the device faulty SET_DISK_FAULTY
 128          */
 129         mdu_array_info_t array;
 130         mdu_disk_info_t disc;
 131         struct stat stb;
 132         int i,j;
 133
 134         if (ioctl(fd, GET_ARRAY_INFO, &array)) {
 135                 fprintf(stderr, Name ": cannot get array info for %s\n",
 136                         devname);
 137                 return 1;
 138         }
 139         for (i=0 ; i<devcnt; i++) {
 140                 if (stat(devnames[i], &stb)) {
 141                         fprintf(stderr, Name ": cannot find %s: %s\n",
 142                                 devnames[i], strerror(errno));
 143                         return 1;
 144                 }
 145                 if ((stb.st_mode & S_IFMT) != S_IFBLK) {
 146                         fprintf(stderr, Name ": %s is not a block device.\n",
 147                                 devnames[i]);
 148                         return 1;
 149                 }
 150                 switch(devmodes[i]){
 151                 default:
 152                         fprintf(stderr, Name ": internal error - devmode[%d]=%d\n",
 153                                 i, devmodes[i]);
 154                         return 1;
 155                 case 'a':
 156                         /* add the device - hot or cold */
 157                         if (ioctl(fd, HOT_ADD_DISK, stb.st_rdev)==0) {
 158                                 fprintf(stderr, Name ": hot added %s\n",
 159                                         devnames[i]);
 160                                 continue;
 161                         }
 162                         /* try ADD_NEW_DISK.
 163                          * we might be creating, we might be assembling,
 164                          * it is hard to tell.
 165                          * set up number/raid_disk/state just
 166                          * in case
 167                          */
 168                         for (j=0; j<array.nr_disks; j++) {
 169                                 if (ioctl(fd, GET_DISK_INFO, &disc))
 170                                         break;
 171                                 if (disc.major==0 && disc.minor==0)
 172                                         break;
 173                                 if (disc.state & 8) /* removed */
 174                                         break;
 175                         }
 176                         disc.number =j;
 177                         disc.raid_disk = j;
 178                         disc.state = 0;
 179                         disc.major = MAJOR(stb.st_rdev);
 180                         disc.minor = MINOR(stb.st_rdev);
 181                         if (ioctl(fd,ADD_NEW_DISK, &disc)) {
 182                                 fprintf(stderr, Name ": add new disk failed for %s: %s\n",
 183                                         devnames[i], strerror(errno));
 184                                 return 1;
 185                         }
 186                         fprintf(stderr, Name ": added %s\n", devnames[i]);
 187                         break;
 188
 189                 case 'r':
 190                         /* hot remove */
 191                         /* FIXME check that it is a current member */
 192                         if (ioctl(fd, HOT_REMOVE_DISK, stb.st_rdev)) {
 193                                 fprintf(stderr, Name ": hot remove failed for %s: %s\n",
 194                                         devnames[i], strerror(errno));
 195                                 return 1;
 196                         }
 197                         fprintf(stderr, Name ": hot removed %s\n", devnames[i]);
 198                         break;
 199
 200                 case 'f': /* set faulty */
 201                         /* FIXME check current member */
 202                         if (ioctl(fd, SET_DISK_FAULTY, stb.st_rdev)) {
 203                                 fprintf(stderr, Name ": set disk faulty failed for %s:  %s\n",
 204                                         devnames[i], strerror(errno));
 205                                 return 1;
 206                         }
 207                         fprintf(stderr, Name ": set %s faulty in %s\n",
 208                                 devnames[i], devname);
 209                         break;
 210                 }
 211         }
 212         return 0;
 213
 214 }