mdadm-1.6.0
[thirdparty/mdadm.git] / 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 }