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_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 stop array %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                    mddev_dev_t devlist)
 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         mddev_dev_t dv;
 132         struct stat stb;
 133         int i,j;
 134         int save_errno;
 135         static buf[4096];
 136
 137         if (ioctl(fd, GET_ARRAY_INFO, &array)) {
 138                 fprintf(stderr, Name ": cannot get array info for %s\n",
 139                         devname);
 140                 return 1;
 141         }
 142         for (dv = devlist ; dv; dv=dv->next) {
 143                 if (stat(dv->devname, &stb)) {
 144                         fprintf(stderr, Name ": cannot find %s: %s\n",
 145                                 dv->devname, strerror(errno));
 146                         return 1;
 147                 }
 148                 if ((stb.st_mode & S_IFMT) != S_IFBLK) {
 149                         fprintf(stderr, Name ": %s is not a block device.\n",
 150                                 dv->devname);
 151                         return 1;
 152                 }
 153                 switch(dv->disposition){
 154                 default:
 155                         fprintf(stderr, Name ": internal error - devmode[%d]=%d\n",
 156                                 i, dv->disposition);
 157                         return 1;
 158                 case 'a':
 159                         /* add the device - hot or cold */
 160                         if (ioctl(fd, HOT_ADD_DISK, (unsigned long)stb.st_rdev)==0) {
 161                                 fprintf(stderr, Name ": hot added %s\n",
 162                                         dv->devname);
 163                                 continue;
 164                         }
 165                         save_errno = errno;
 166                         if (read(fd, buf, sizeof(buf)) > 0) {
 167                                 /* array is active, so don't try to add.
 168                                  * i.e. something is wrong
 169                                  */
 170                                 fprintf(stderr, Name ": hot add failed for %s: %s\n",
 171                                         dv->devname, strerror(save_errno));
 172                                 return 1;
 173                         }
 174                         /* try ADD_NEW_DISK.
 175                          * we might be creating, we might be assembling,
 176                          * it is hard to tell.
 177                          * set up number/raid_disk/state just
 178                          * in case
 179                          */
 180                         for (j=0; j<array.nr_disks; j++) {
 181                                 if (ioctl(fd, GET_DISK_INFO, &disc))
 182                                         break;
 183                                 if (disc.major==0 && disc.minor==0)
 184                                         break;
 185                                 if (disc.state & 8) /* removed */
 186                                         break;
 187                         }
 188                         disc.number =j;
 189                         disc.raid_disk = j;
 190                         disc.state = 0;
 191                         disc.major = MAJOR(stb.st_rdev);
 192                         disc.minor = MINOR(stb.st_rdev);
 193                         if (ioctl(fd,ADD_NEW_DISK, &disc)) {
 194                                 fprintf(stderr, Name ": add new disk failed for %s: %s\n",
 195                                         dv->devname, strerror(errno));
 196                                 return 1;
 197                         }
 198                         fprintf(stderr, Name ": added %s\n", dv->devname);
 199                         break;
 200
 201                 case 'r':
 202                         /* hot remove */
 203                         /* FIXME check that it is a current member */
 204                         if (ioctl(fd, HOT_REMOVE_DISK, (unsigned long)stb.st_rdev)) {
 205                                 fprintf(stderr, Name ": hot remove failed for %s: %s\n",
 206                                         dv->devname, strerror(errno));
 207                                 return 1;
 208                         }
 209                         fprintf(stderr, Name ": hot removed %s\n", dv->devname);
 210                         break;
 211
 212                 case 'f': /* set faulty */
 213                         /* FIXME check current member */
 214                         if (ioctl(fd, SET_DISK_FAULTY, (unsigned long) stb.st_rdev)) {
 215                                 fprintf(stderr, Name ": set disk faulty failed for %s:  %s\n",
 216                                         dv->devname, strerror(errno));
 217                                 return 1;
 218                         }
 219                         fprintf(stderr, Name ": set %s faulty in %s\n",
 220                                 dv->devname, devname);
 221                         break;
 222                 }
 223         }
 224         return 0;
 225
 226 }