Examine.c

   1 /*
   2  * mdadm - manage Linux "md" devices aka RAID arrays.
   3  *
   4  * Copyright (C) 2001-2009 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(mddev_dev_t devlist, int brief, int export, int scan,
  34             int SparcAdjust, struct supertype *forcest,
  35             char *homehost)
  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 line including devices=
  51          * if devlist==NULL, use conf_get_devs()
  52          */
  53         int fd;
  54         int rv = 0;
  55         int err = 0;
  56
  57         struct array {
  58                 struct supertype *st;
  59                 struct mdinfo info;
  60                 void *devs;
  61                 struct array *next;
  62                 int spares;
  63         } *arrays = NULL;
  64
  65         for (; devlist ; devlist=devlist->next) {
  66                 struct supertype *st;
  67                 int have_container = 0;
  68
  69                 fd = dev_open(devlist->devname, O_RDONLY);
  70                 if (fd < 0) {
  71                         if (!scan) {
  72                                 fprintf(stderr,Name ": cannot open %s: %s\n",
  73                                         devlist->devname, strerror(errno));
  74                                 rv = 1;
  75                         }
  76                         err = 1;
  77                 }
  78                 else {
  79                         unsigned long long size;
  80                         int container = 0;
  81                         if (forcest)
  82                                 st = dup_super(forcest);
  83                         else if (get_dev_size(fd, NULL, &size) == 0 || size == 0) {
  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                                 if (!container)
  92                                         err = st->ss->load_super(st, fd,
  93                                                                  (brief||scan) ? NULL
  94                                                                  :devlist->devname);
  95                                 if (err && st->ss->load_container) {
  96                                         err = st->ss->load_container(st, fd,
  97                                                                  (brief||scan) ? NULL
  98                                                                  :devlist->devname);
  99                                         if (!err)
 100                                                 have_container = 1;
 101                                 }
 102                         } else {
 103                                 if (!brief) {
 104                                         fprintf(stderr, Name ": No md superblock detected on %s.\n", devlist->devname);
 105                                         rv = 1;
 106                                 }
 107                                 err = 1;
 108                         }
 109                         close(fd);
 110                 }
 111                 if (err)
 112                         continue;
 113
 114                 if (SparcAdjust)
 115                         st->ss->update_super(st, NULL, "sparc2.2",
 116                                              devlist->devname, 0, 0, NULL);
 117                 /* Ok, its good enough to try, though the checksum could be wrong */
 118
 119                 if (brief && st->ss->brief_examine_super == NULL) {
 120                         if (!scan)
 121                                 fprintf(stderr, Name ": No brief listing for %s on %s\n",
 122                                         st->ss->name, devlist->devname);
 123                 } else if (brief) {
 124                         struct array *ap;
 125                         char *d;
 126                         for (ap=arrays; ap; ap=ap->next) {
 127                                 if (st->ss == ap->st->ss &&
 128                                     st->ss->compare_super(ap->st, st)==0)
 129                                         break;
 130                         }
 131                         if (!ap) {
 132                                 ap = malloc(sizeof(*ap));
 133                                 ap->devs = dl_head();
 134                                 ap->next = arrays;
 135                                 ap->spares = 0;
 136                                 ap->st = st;
 137                                 arrays = ap;
 138                                 st->ss->getinfo_super(st, &ap->info, NULL);
 139                         } else
 140                                 st->ss->getinfo_super(st, &ap->info, NULL);
 141                         if (!have_container &&
 142                             !(ap->info.disk.state & (1<<MD_DISK_SYNC)))
 143                                 ap->spares++;
 144                         d = dl_strdup(devlist->devname);
 145                         dl_add(ap->devs, d);
 146                 } else if (export) {
 147                         if (st->ss->export_examine_super)
 148                                 st->ss->export_examine_super(st);
 149                 } else {
 150                         printf("%s:\n",devlist->devname);
 151                         st->ss->examine_super(st, homehost);
 152                         st->ss->free_super(st);
 153                 }
 154         }
 155         if (brief) {
 156                 struct array *ap;
 157                 for (ap=arrays; ap; ap=ap->next) {
 158                         char sep='=';
 159                         char *d;
 160                         int newline = 0;
 161
 162                         ap->st->ss->brief_examine_super(ap->st, brief > 1);
 163                         if (ap->spares)
 164                                 newline += printf("   spares=%d", ap->spares);
 165                         if (brief > 1) {
 166                                 newline += printf("   devices");
 167                                 for (d=dl_next(ap->devs); d!= ap->devs; d=dl_next(d)) {
 168                                         printf("%c%s", sep, d);
 169                                         sep=',';
 170                                 }
 171                         }
 172                         if (ap->st->ss->brief_examine_subarrays) {
 173                                 if (newline)
 174                                         printf("\n");
 175                                 ap->st->ss->brief_examine_subarrays(ap->st, brief > 1);
 176                         }
 177                         ap->st->ss->free_super(ap->st);
 178                         /* FIXME free ap */
 179                         if (ap->spares || brief > 1)
 180                                 printf("\n");
 181                 }
 182         }
 183         return rv;
 184 }