Examine.c

   1 /*
   2  * mdadm - manage Linux "md" devices aka RAID arrays.
   3  *
   4  * Copyright (C) 2001-2002 Neil Brown <neilb@cse.unsw.edu.au>
   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, int SparcAdjust)
  39 {
  40
  41         /* Read the raid superblock from a device and
  42          * display important content.
  43          *
  44          * If cannot be found, print reason: too small, bad magic
  45          *
  46          * Print:
  47          *   version, ctime, level, size, raid+spare+
  48          *   prefered minor
  49          *   uuid
  50          *
  51          *   utime, state etc
  52          *
  53          * If (brief) gather devices for same array and just print a mdadm.conf line including devices=
  54          * if devlist==NULL, use conf_get_devs(
  55          */
  56         int fd;
  57         time_t atime;
  58         mdp_super_t super;
  59         int d;
  60         char *c;
  61         int rv = 0;
  62         int err;
  63         int spares = 0;
  64
  65         struct array {
  66                 mdp_super_t super;
  67                 void *devs;
  68                 struct array *next;
  69         } *arrays = NULL;
  70
  71         for (; devlist ; devlist=devlist->next) {
  72                 fd = open(devlist->devname, O_RDONLY);
  73                 if (fd < 0) {
  74                         if (!scan)
  75                                 fprintf(stderr,Name ": cannot open %s: %s\n",
  76                                         devlist->devname, strerror(errno));
  77                         err = 1;
  78                 }
  79                 else {
  80                         err = load_super(fd, &super);
  81                         close(fd);
  82                 }
  83                 if (err && (brief||scan))
  84                         continue;
  85                 if (err) rv =1;
  86                 switch(err) {
  87                 case 1:
  88                         fprintf(stderr, Name ": cannot find device size for %s: %s\n",
  89                                 devlist->devname, strerror(errno));
  90                         continue;
  91                 case 2:
  92 /*              fprintf(stderr, Name ": %s is too small for md: size is %ld sectors\n",
  93                 devlist->devname, size);
  94 */
  95                         fprintf(stderr, Name ": %s is too small for md\n",
  96                                 devlist->devname);
  97                         continue;
  98                 case 3:
  99                         fprintf(stderr, Name ": Cannot seek to superblock on %s: %s\n",
 100                                 devlist->devname, strerror(errno));
 101                         continue;
 102                 case 4:
 103                         fprintf(stderr, Name ": Cannot read superblock on %s\n",
 104                                 devlist->devname);
 105                         continue;
 106                 case 5:
 107                         fprintf(stderr, Name ": No super block found on %s (Expected magic %08x, got %08x)\n",
 108                                 devlist->devname, MD_SB_MAGIC, super.md_magic);
 109                         continue;
 110                 case 6:
 111                         fprintf(stderr, Name ": Cannot interpret superblock on %s - version is %d\n",
 112                                 devlist->devname, super.major_version);
 113                         continue;
 114                 }
 115
 116                 /* Ok, its good enough to try, though the checksum could be wrong */
 117                 if (brief) {
 118                         struct array *ap;
 119                         char *d;
 120                         for (ap=arrays; ap; ap=ap->next) {
 121                                 if (compare_super(&ap->super, &super)==0)
 122                                         break;
 123                         }
 124                         if (!ap) {
 125                                 ap = malloc(sizeof(*ap));
 126                                 ap->super = super;
 127                                 ap->devs = dl_head();
 128                                 ap->next = arrays;
 129                                 arrays = ap;
 130                         }
 131                         d = dl_strdup(devlist->devname);
 132                         dl_add(ap->devs, d);
 133                 } else {
 134                         printf("%s:\n",devlist->devname);
 135                         printf("          Magic : %08x\n", super.md_magic);
 136                         printf("        Version : %02d.%02d.%02d\n", super.major_version, super.minor_version,
 137                                super.patch_version);
 138                         if (super.minor_version >= 90)
 139                                 printf("           UUID : %08x:%08x:%08x:%08x\n", super.set_uuid0, super.set_uuid1,
 140                                        super.set_uuid2, super.set_uuid3);
 141                         else
 142                                 printf("           UUID : %08x\n", super.set_uuid0);
 143
 144                         atime = super.ctime;
 145                         printf("  Creation Time : %.24s\n", ctime(&atime));
 146                         c=map_num(pers, super.level);
 147                         printf("     Raid Level : %s\n", c?c:"-unknown-");
 148                         printf("    Device Size : %d%s\n", super.size, human_size((long long)super.size<<10));
 149                         printf("   Raid Devices : %d\n", super.raid_disks);
 150                         printf("  Total Devices : %d\n", super.nr_disks);
 151                         printf("Preferred Minor : %d\n", super.md_minor);
 152                         printf("\n");
 153                         atime = super.utime;
 154                         printf("    Update Time : %.24s\n", ctime(&atime));
 155                         printf("          State : %s\n",
 156                                (super.state&(1<<MD_SB_CLEAN))?"clean":"dirty");
 157                         printf(" Active Devices : %d\n", super.active_disks);
 158                         printf("Working Devices : %d\n", super.working_disks);
 159                         printf(" Failed Devices : %d\n", super.failed_disks);
 160                         printf("  Spare Devices : %d\n", super.spare_disks);
 161                         if (calc_sb_csum(&super) == super.sb_csum)
 162                                 printf("       Checksum : %x - correct\n", super.sb_csum);
 163                         else
 164                                 printf("       Checksum : %x - expected %lx\n", super.sb_csum, calc_sb_csum(&super));
 165                         if (SparcAdjust) {
 166                                 /* 2.2 sparc put the events in the wrong place
 167                                  * So we copy the tail of the superblock
 168                                  * up 4 bytes before continuing
 169                                  */
 170                                 __u32 *sb32 = (__u32*)&super;
 171                                 memcpy(sb32+MD_SB_GENERIC_CONSTANT_WORDS+7,
 172                                        sb32+MD_SB_GENERIC_CONSTANT_WORDS+7+1,
 173                                        (MD_SB_WORDS - (MD_SB_GENERIC_CONSTANT_WORDS+7+1))*4);
 174                                 printf (" --- adjusting superblock for 2.2/sparc compatability ---\n");
 175                         }
 176                         printf("         Events : %d.%d\n", super.events_hi, super.events_lo);
 177                         printf("\n");
 178                         if (super.level == 5) {
 179                                 c = map_num(r5layout, super.layout);
 180                                 printf("         Layout : %s\n", c?c:"-unknown-");
 181                         }
 182                         switch(super.level) {
 183                         case 0:
 184                         case 4:
 185                         case 5:
 186                                 printf("     Chunk Size : %dK\n", super.chunk_size/1024);
 187                                 break;
 188                         case -1:
 189                                 printf("       Rounding : %dK\n", super.chunk_size/1024);
 190                                 break;
 191                         default: break;
 192                         }
 193                         printf("\n");
 194                         printf("      Number   Major   Minor   RaidDevice State\n");
 195                         for (d= -1; d<(signed int)(super.raid_disks+super.spare_disks); d++) {
 196                                 mdp_disk_t *dp;
 197                                 char *dv;
 198                                 char nb[5];
 199                                 if (d>=0) dp = &super.disks[d];
 200                                 else dp = &super.this_disk;
 201                                 sprintf(nb, "%4d", d);
 202                                 printf("%4s %5d   %5d    %5d    %5d     ", d < 0 ? "this" :  nb,
 203                                        dp->number, dp->major, dp->minor, dp->raid_disk);
 204                                 if (dp->state & (1<<MD_DISK_FAULTY)) printf(" faulty");
 205                                 if (dp->state & (1<<MD_DISK_ACTIVE)) printf(" active");
 206                                 if (dp->state & (1<<MD_DISK_SYNC)) printf(" sync");
 207                                 if (dp->state & (1<<MD_DISK_REMOVED)) printf(" removed");
 208                                 if (dp->state == 0) { printf(" spare"); spares++; }
 209                                 if ((dv=map_dev(dp->major, dp->minor)))
 210                                         printf("   %s", dv);
 211                                 printf("\n");
 212                         }
 213                 }
 214                 if (SparcAdjust == 2) {
 215                         printf(" ----- updating superblock on device ----\n");
 216                         fd = open(devlist->devname, O_RDWR);
 217                         if (fd < 0) {
 218                                 fprintf(stderr, Name ": cannot open %s to update superblock: %s\n",
 219                                         devlist->devname, strerror(errno));
 220                                 err = 1;
 221                         } else {
 222                                 super.sb_csum = calc_sb_csum(&super);
 223                                 if (store_super(fd, &super)) {
 224                                         fprintf(stderr, Name ": Count not re-write superblock on %s\n",
 225                                                 devlist->devname);
 226                                         err = 1;
 227                                 }
 228                                 close(fd);
 229                         }
 230                 }
 231         }
 232         if (brief) {
 233                 struct array *ap;
 234                 for (ap=arrays; ap; ap=ap->next) {
 235                         char sep='=';
 236                         char *c=map_num(pers, ap->super.level);
 237                         char *d;
 238                         printf("ARRAY %s level=%s num-devices=%d UUID=",
 239                                get_md_name(ap->super.md_minor),
 240                                c?c:"-unknown-", ap->super.raid_disks);
 241                         if (spares) printf(" spares=%d", spares);
 242                         if (ap->super.minor_version >= 90)
 243                                 printf("%08x:%08x:%08x:%08x", ap->super.set_uuid0, ap->super.set_uuid1,
 244                                        ap->super.set_uuid2, ap->super.set_uuid3);
 245                         else
 246                                 printf("%08x", ap->super.set_uuid0);
 247                         printf("\n   devices");
 248                         for (d=dl_next(ap->devs); d!= ap->devs; d=dl_next(d)) {
 249                                 printf("%c%s", sep, d);
 250                                 sep=',';
 251                         }
 252                         printf("\n");
 253                 }
 254         }
 255         return rv;
 256 }