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 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         void *super = NULL;
  60         int rv = 0;
  61         int err = 0;
  62
  63         struct array {
  64                 void *super;
  65                 struct supertype *st;
  66                 struct mdinfo info;
  67                 void *devs;
  68                 struct array *next;
  69                 int spares;
  70         } *arrays = NULL;
  71
  72         for (; devlist ; devlist=devlist->next) {
  73                 struct supertype *st = forcest;
  74
  75                 fd = dev_open(devlist->devname, O_RDONLY);
  76                 if (fd < 0) {
  77                         if (!scan) {
  78                                 fprintf(stderr,Name ": cannot open %s: %s\n",
  79                                         devlist->devname, strerror(errno));
  80                                 err = 1;
  81                         }
  82                 }
  83                 else {
  84                         if (!st)
  85                                 st = guess_super(fd);
  86                         if (st)
  87                                 err = st->ss->load_super(st, fd, &super, (brief||scan)?NULL:devlist->devname);
  88                         else {
  89                                 if (!brief)
  90                                         fprintf(stderr, Name ": No md superblock detected on %s.\n", devlist->devname);
  91                                 err = 1;
  92                         }
  93                         close(fd);
  94                 }
  95                 if (err) {
  96                         rv = 1;
  97                         continue;
  98                 }
  99
 100                 if (SparcAdjust)
 101                         st->ss->update_super(NULL, super, "sparc2.2", devlist->devname, 0, 0, NULL);
 102                 /* Ok, its good enough to try, though the checksum could be wrong */
 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 && st->ss->compare_super(&ap->super, super)==0)
 108                                         break;
 109                         }
 110                         if (!ap) {
 111                                 ap = malloc(sizeof(*ap));
 112                                 ap->super = super;
 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(&ap->info, super);
 119                         } else {
 120                                 st->ss->getinfo_super(&ap->info, super);
 121                                 free(super);
 122                         }
 123                         if (!(ap->info.disk.state & MD_DISK_SYNC))
 124                                 ap->spares++;
 125                         d = dl_strdup(devlist->devname);
 126                         dl_add(ap->devs, d);
 127                 } else {
 128                         printf("%s:\n",devlist->devname);
 129                         st->ss->examine_super(super, homehost);
 130                         free(super);
 131                 }
 132         }
 133         if (brief) {
 134                 struct array *ap;
 135                 for (ap=arrays; ap; ap=ap->next) {
 136                         char sep='=';
 137                         char *d;
 138                         ap->st->ss->brief_examine_super(ap->super);
 139                         if (ap->spares) printf("   spares=%d", ap->spares);
 140                         if (brief > 1) {
 141                                 printf("   devices");
 142                                 for (d=dl_next(ap->devs); d!= ap->devs; d=dl_next(d)) {
 143                                         printf("%c%s", sep, d);
 144                                         sep=',';
 145                                 }
 146                         }
 147                         free(ap->super);
 148                         /* FIXME free ap */
 149                         if (ap->spares || brief > 1)
 150                                 printf("\n");
 151                 }
 152         }
 153         return rv;
 154 }