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
  68                 fd = dev_open(devlist->devname, O_RDONLY);
  69                 if (fd < 0) {
  70                         if (!scan) {
  71                                 fprintf(stderr,Name ": cannot open %s: %s\n",
  72                                         devlist->devname, strerror(errno));
  73                                 rv = 1;
  74                         }
  75                         err = 1;
  76                 }
  77                 else {
  78                         if (forcest)
  79                                 st = dup_super(forcest);
  80                         else
  81                                 st = guess_super(fd);
  82                         if (st)
  83                                 err = st->ss->load_super(st, fd,
  84                                                          (brief||scan) ? NULL
  85                                                            :devlist->devname);
  86                         else {
  87                                 if (!brief) {
  88                                         fprintf(stderr, Name ": No md superblock detected on %s.\n", devlist->devname);
  89                                         rv = 1;
  90                                 }
  91                                 err = 1;
  92                         }
  93                         close(fd);
  94                 }
  95                 if (err)
  96                         continue;
  97
  98                 if (SparcAdjust)
  99                         st->ss->update_super(st, NULL, "sparc2.2",
 100                                              devlist->devname, 0, 0, NULL);
 101                 /* Ok, its good enough to try, though the checksum could be wrong */
 102
 103                 if (brief) {
 104                         struct array *ap;
 105                         char *d;
 106                         for (ap=arrays; ap; ap=ap->next) {
 107                                 if (st->ss == ap->st->ss &&
 108                                     st->ss->compare_super(ap->st, st)==0)
 109                                         break;
 110                         }
 111                         if (!ap) {
 112                                 ap = malloc(sizeof(*ap));
 113                                 ap->devs = dl_head();
 114                                 ap->next = arrays;
 115                                 ap->spares = 0;
 116                                 ap->st = st;
 117                                 arrays = ap;
 118                                 st->ss->getinfo_super(st, &ap->info);
 119                         } else
 120                                 st->ss->getinfo_super(st, &ap->info);
 121                         if (!st->loaded_container &&
 122                             !(ap->info.disk.state & (1<<MD_DISK_SYNC)))
 123                                 ap->spares++;
 124                         d = dl_strdup(devlist->devname);
 125                         dl_add(ap->devs, d);
 126                 } else if (export) {
 127                         if (st->ss->export_examine_super)
 128                                 st->ss->export_examine_super(st);
 129                 } else {
 130                         printf("%s:\n",devlist->devname);
 131                         st->ss->examine_super(st, homehost);
 132                         st->ss->free_super(st);
 133                 }
 134         }
 135         if (brief) {
 136                 struct array *ap;
 137                 for (ap=arrays; ap; ap=ap->next) {
 138                         char sep='=';
 139                         char *d;
 140                         int newline = 0;
 141
 142                         ap->st->ss->brief_examine_super(ap->st, brief > 1);
 143                         if (ap->spares)
 144                                 newline += printf("   spares=%d", ap->spares);
 145                         if (brief > 1) {
 146                                 newline += printf("   devices");
 147                                 for (d=dl_next(ap->devs); d!= ap->devs; d=dl_next(d)) {
 148                                         printf("%c%s", sep, d);
 149                                         sep=',';
 150                                 }
 151                         }
 152                         if (ap->st->ss->brief_examine_subarrays) {
 153                                 if (newline)
 154                                         printf("\n");
 155                                 ap->st->ss->brief_examine_subarrays(ap->st, brief > 1);
 156                         }
 157                         ap->st->ss->free_super(ap->st);
 158                         /* FIXME free ap */
 159                         if (ap->spares || brief > 1)
 160                                 printf("\n");
 161                 }
 162         }
 163         return rv;
 164 }