Examine.c

   1 /*
   2  * mdadm - manage Linux "md" devices aka RAID arrays.
   3  *
   4  * Copyright (C) 2001-2013 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 #include        "dlink.h"
  27
  28 #if ! defined(__BIG_ENDIAN) && ! defined(__LITTLE_ENDIAN)
  29 #error no endian defined
  30 #endif
  31 #include        "md_u.h"
  32 #include        "md_p.h"
  33 int Examine(struct mddev_dev *devlist,
  34             struct context *c,
  35             struct supertype *forcest)
  36 {
  37
  38         /* Read the raid superblock from a device and
  39          * display important content.
  40          *
  41          * If cannot be found, print reason: too small, bad magic
  42          *
  43          * Print:
  44          *   version, ctime, level, size, raid+spare+
  45          *   prefered minor
  46          *   uuid
  47          *
  48          *   utime, state etc
  49          *
  50          * If (brief) gather devices for same array and just print a mdadm.conf
  51          * line including devices=
  52          * if devlist==NULL, use conf_get_devs()
  53          */
  54         int fd;
  55         int rv = 0;
  56         int err = 0;
  57
  58         struct array {
  59                 struct supertype *st;
  60                 struct mdinfo info;
  61                 void *devs;
  62                 struct array *next;
  63                 int spares;
  64         } *arrays = NULL;
  65
  66         for (; devlist ; devlist = devlist->next) {
  67                 struct supertype *st;
  68                 int have_container = 0;
  69
  70                 fd = dev_open(devlist->devname, O_RDONLY);
  71                 if (fd < 0) {
  72                         if (!c->scan) {
  73                                 pr_err("cannot open %s: %s\n",
  74                                        devlist->devname, strerror(errno));
  75                                 rv = 1;
  76                         }
  77                         err = 1;
  78                 }
  79                 else {
  80                         int container = 0;
  81                         if (forcest)
  82                                 st = dup_super(forcest);
  83                         else if (must_be_container(fd)) {
  84                                 /* might be a container */
  85                                 st = super_by_fd(fd, NULL);
  86                                 container = 1;
  87                         } else
  88                                 st = guess_super(fd);
  89                         if (st) {
  90                                 err = 1;
  91                                 st->ignore_hw_compat = 1;
  92                                 if (!container)
  93                                         err = st->ss->load_super(st, fd,
  94                                                                  (c->brief||c->scan) ? NULL
  95                                                                  :devlist->devname);
  96                                 if (err && st->ss->load_container) {
  97                                         err = st->ss->load_container(st, fd,
  98                                                                  (c->brief||c->scan) ? NULL
  99                                                                  :devlist->devname);
 100                                         if (!err)
 101                                                 have_container = 1;
 102                                 }
 103                                 st->ignore_hw_compat = 0;
 104                         } else {
 105                                 if (!c->brief) {
 106                                         pr_err("No md superblock detected on %s.\n", devlist->devname);
 107                                         rv = 1;
 108                                 }
 109                                 err = 1;
 110                         }
 111                         close(fd);
 112                 }
 113                 if (err)
 114                         continue;
 115
 116                 if (c->SparcAdjust)
 117                         st->ss->update_super(st, NULL, "sparc2.2",
 118                                              devlist->devname, 0, 0, NULL);
 119                 /* Ok, its good enough to try, though the checksum could be wrong */
 120
 121                 if (c->brief && st->ss->brief_examine_super == NULL) {
 122                         if (!c->scan)
 123                                 pr_err("No brief listing for %s on %s\n",
 124                                         st->ss->name, devlist->devname);
 125                 } else if (c->brief) {
 126                         struct array *ap;
 127                         char *d;
 128                         for (ap = arrays; ap; ap = ap->next) {
 129                                 if (st->ss == ap->st->ss &&
 130                                     st->ss->compare_super(ap->st, st) == 0)
 131                                         break;
 132                         }
 133                         if (!ap) {
 134                                 ap = xmalloc(sizeof(*ap));
 135                                 ap->devs = dl_head();
 136                                 ap->next = arrays;
 137                                 ap->spares = 0;
 138                                 ap->st = st;
 139                                 arrays = ap;
 140                                 st->ss->getinfo_super(st, &ap->info, NULL);
 141                         } else
 142                                 st->ss->getinfo_super(st, &ap->info, NULL);
 143                         if (!have_container &&
 144                             !(ap->info.disk.state & (1<<MD_DISK_SYNC)))
 145                                 ap->spares++;
 146                         d = dl_strdup(devlist->devname);
 147                         dl_add(ap->devs, d);
 148                 } else if (c->export) {
 149                         if (st->ss->export_examine_super)
 150                                 st->ss->export_examine_super(st);
 151                         st->ss->free_super(st);
 152                 } else {
 153                         printf("%s:\n",devlist->devname);
 154                         st->ss->examine_super(st, c->homehost);
 155                         st->ss->free_super(st);
 156                 }
 157         }
 158         if (c->brief) {
 159                 struct array *ap;
 160                 for (ap = arrays; ap; ap = ap->next) {
 161                         char sep='=';
 162                         char *d;
 163                         int newline = 0;
 164
 165                         ap->st->ss->brief_examine_super(ap->st, c->verbose > 0);
 166                         if (ap->spares)
 167                                 newline += printf("   spares=%d", ap->spares);
 168                         if (c->verbose > 0) {
 169                                 newline += printf("   devices");
 170                                 for (d = dl_next(ap->devs);
 171                                      d != ap->devs;
 172                                      d=dl_next(d)) {
 173                                         printf("%c%s", sep, d);
 174                                         sep=',';
 175                                 }
 176                         }
 177                         if (ap->st->ss->brief_examine_subarrays) {
 178                                 if (newline)
 179                                         printf("\n");
 180                                 ap->st->ss->brief_examine_subarrays(ap->st, c->verbose);
 181                         }
 182                         ap->st->ss->free_super(ap->st);
 183                         /* FIXME free ap */
 184                         if (ap->spares || c->verbose > 0)
 185                                 printf("\n");
 186                 }
 187         }
 188         return rv;
 189 }
 190
 191 int ExamineBadblocks(char *devname, int brief, struct supertype *forcest)
 192 {
 193         int fd = dev_open(devname, O_RDONLY);
 194         struct supertype *st = forcest;
 195         int err = 1;
 196
 197         if (fd < 0) {
 198                 pr_err("cannot open %s: %s\n", devname, strerror(errno));
 199                 return 1;
 200         }
 201         if (!st)
 202                 st = guess_super(fd);
 203         if (!st) {
 204                 if (!brief)
 205                         pr_err("No md superblock detected on %s\n", devname);
 206                 goto out;
 207         }
 208         if (!st->ss->examine_badblocks) {
 209                 pr_err("%s metadata does not support badblocks\n", st->ss->name);
 210                 goto out;
 211         }
 212         err = st->ss->load_super(st, fd, brief ? NULL : devname);
 213         if (err)
 214                 goto out;
 215         err = st->ss->examine_badblocks(st, fd, devname);
 216
 217 out:
 218         if (fd >= 0)
 219                 close(fd);
 220         if (st) {
 221                 st->ss->free_super(st);
 222                 free(st);
 223         }
 224         return err;
 225 }