Examine.c

   1 /*
   2  * mdadm - manage Linux "md" devices aka RAID arrays.
   3  *
   4  * Copyright (C) 2001-2006 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@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        "dlink.h"
  32
  33 #if ! defined(__BIG_ENDIAN) && ! defined(__LITTLE_ENDIAN)
  34 #error no endian defined
  35 #endif
  36 #include        "md_u.h"
  37 #include        "md_p.h"
  38 int Examine(mddev_dev_t devlist, int brief, int export, int scan,
  39             int SparcAdjust, struct supertype *forcest,
  40             char *homehost)
  41 {
  42
  43         /* Read the raid superblock from a device and
  44          * display important content.
  45          *
  46          * If cannot be found, print reason: too small, bad magic
  47          *
  48          * Print:
  49          *   version, ctime, level, size, raid+spare+
  50          *   prefered minor
  51          *   uuid
  52          *
  53          *   utime, state etc
  54          *
  55          * If (brief) gather devices for same array and just print a mdadm.conf line including devices=
  56          * if devlist==NULL, use conf_get_devs()
  57          */
  58         int fd;
  59         int rv = 0;
  60         int err = 0;
  61
  62         struct array {
  63                 struct supertype *st;
  64                 struct mdinfo info;
  65                 void *devs;
  66                 struct array *next;
  67                 int spares;
  68         } *arrays = NULL;
  69
  70         for (; devlist ; devlist=devlist->next) {
  71                 struct supertype *st = forcest;
  72
  73                 fd = dev_open(devlist->devname, O_RDONLY);
  74                 if (fd < 0) {
  75                         if (!scan) {
  76                                 fprintf(stderr,Name ": cannot open %s: %s\n",
  77                                         devlist->devname, strerror(errno));
  78                                 rv = 1;
  79                         }
  80                         err = 1;
  81                 }
  82                 else {
  83                         if (!st)
  84                                 st = guess_super(fd);
  85                         if (st)
  86                                 err = st->ss->load_super(st, fd,
  87                                                          (brief||scan) ? NULL
  88                                                            :devlist->devname);
  89                         else {
  90                                 if (!brief) {
  91                                         fprintf(stderr, Name ": No md superblock detected on %s.\n", devlist->devname);
  92                                         rv = 1;
  93                                 }
  94                                 err = 1;
  95                         }
  96                         close(fd);
  97                 }
  98                 if (err)
  99                         continue;
 100
 101                 if (SparcAdjust)
 102                         st->ss->update_super(st, NULL, "sparc2.2",
 103                                              devlist->devname, 0, 0, NULL);
 104                 /* Ok, its good enough to try, though the checksum could be wrong */
 105
 106                 if (brief) {
 107                         struct array *ap;
 108                         char *d;
 109                         for (ap=arrays; ap; ap=ap->next) {
 110                                 if (st->ss == ap->st->ss &&
 111                                     st->ss->compare_super(ap->st, st)==0)
 112                                         break;
 113                         }
 114                         if (!ap) {
 115                                 ap = malloc(sizeof(*ap));
 116                                 ap->devs = dl_head();
 117                                 ap->next = arrays;
 118                                 ap->spares = 0;
 119                                 ap->st = st;
 120                                 arrays = ap;
 121                                 st->ss->getinfo_super(st, &ap->info);
 122                         } else {
 123                                 st->ss->getinfo_super(st, &ap->info);
 124                                 st->ss->free_super(st);
 125                         }
 126                         if (!(ap->info.disk.state & MD_DISK_SYNC))
 127                                 ap->spares++;
 128                         d = dl_strdup(devlist->devname);
 129                         dl_add(ap->devs, d);
 130                 } else if (export) {
 131                         st->ss->export_examine_super(st);
 132                 } else {
 133                         printf("%s:\n",devlist->devname);
 134                         st->ss->examine_super(st, homehost);
 135                         st->ss->free_super(st);
 136                 }
 137         }
 138         if (brief) {
 139                 struct array *ap;
 140                 for (ap=arrays; ap; ap=ap->next) {
 141                         char sep='=';
 142                         char *d;
 143                         ap->st->ss->brief_examine_super(ap->st);
 144                         if (ap->spares) printf("   spares=%d", ap->spares);
 145                         if (brief > 1) {
 146                                 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                         ap->st->ss->free_super(ap->st);
 153                         /* FIXME free ap */
 154                         if (ap->spares || brief > 1)
 155                                 printf("\n");
 156                 }
 157         }
 158         return rv;
 159 }