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mdadm/Examine.c

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/*
* mdadm - manage Linux "md" devices aka RAID arrays.
*
* Copyright (C) 2001-2002 Neil Brown <neilb@cse.unsw.edu.au>
*
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Author: Neil Brown
* Email: <neilb@cse.unsw.edu.au>
* Paper: Neil Brown
* School of Computer Science and Engineering
* The University of New South Wales
* Sydney, 2052
* Australia
*/
#include "mdadm.h"
#include "dlink.h"
#if ! defined(__BIG_ENDIAN) && ! defined(__LITTLE_ENDIAN)
#error no endian defined
#endif
#include "md_u.h"
#include "md_p.h"
int Examine(mddev_dev_t devlist, int brief, int scan, int SparcAdjust)
{
/* Read the raid superblock from a device and
* display important content.
*
* If cannot be found, print reason: too small, bad magic
*
* Print:
* version, ctime, level, size, raid+spare+
* prefered minor
* uuid
*
* utime, state etc
*
* If (brief) gather devices for same array and just print a mdadm.conf line including devices=
* if devlist==NULL, use conf_get_devs(
*/
int fd;
time_t atime;
mdp_super_t super;
int d;
char *c;
int rv = 0;
int err;
int spares = 0;
struct array {
mdp_super_t super;
void *devs;
struct array *next;
} *arrays = NULL;
for (; devlist ; devlist=devlist->next) {
fd = open(devlist->devname, O_RDONLY);
if (fd < 0) {
if (!scan)
fprintf(stderr,Name ": cannot open %s: %s\n",
devlist->devname, strerror(errno));
err = 1;
}
else {
err = load_super(fd, &super);
close(fd);
}
if (err && (brief||scan))
continue;
if (err) rv =1;
switch(err) {
case 1:
fprintf(stderr, Name ": cannot find device size for %s: %s\n",
devlist->devname, strerror(errno));
continue;
case 2:
/* fprintf(stderr, Name ": %s is too small for md: size is %ld sectors\n",
devlist->devname, size);
*/
fprintf(stderr, Name ": %s is too small for md\n",
devlist->devname);
continue;
case 3:
fprintf(stderr, Name ": Cannot seek to superblock on %s: %s\n",
devlist->devname, strerror(errno));
continue;
case 4:
fprintf(stderr, Name ": Cannot read superblock on %s\n",
devlist->devname);
continue;
case 5:
fprintf(stderr, Name ": No super block found on %s (Expected magic %08x, got %08x)\n",
devlist->devname, MD_SB_MAGIC, super.md_magic);
continue;
case 6:
fprintf(stderr, Name ": Cannot interpret superblock on %s - version is %d\n",
devlist->devname, super.major_version);
continue;
}
/* Ok, its good enough to try, though the checksum could be wrong */
if (brief) {
struct array *ap;
char *d;
for (ap=arrays; ap; ap=ap->next) {
if (compare_super(&ap->super, &super)==0)
break;
}
if (!ap) {
ap = malloc(sizeof(*ap));
ap->super = super;
ap->devs = dl_head();
ap->next = arrays;
arrays = ap;
}
d = dl_strdup(devlist->devname);
dl_add(ap->devs, d);
} else {
printf("%s:\n",devlist->devname);
printf(" Magic : %08x\n", super.md_magic);
printf(" Version : %02d.%02d.%02d\n", super.major_version, super.minor_version,
super.patch_version);
if (super.minor_version >= 90)
printf(" UUID : %08x:%08x:%08x:%08x\n", super.set_uuid0, super.set_uuid1,
super.set_uuid2, super.set_uuid3);
else
printf(" UUID : %08x\n", super.set_uuid0);
atime = super.ctime;
printf(" Creation Time : %.24s\n", ctime(&atime));
c=map_num(pers, super.level);
printf(" Raid Level : %s\n", c?c:"-unknown-");
if (super.level <= 0)
printf(" Device Size : %u%s\n", super.size, human_size((long long)super.size<<10));
printf(" Raid Devices : %d\n", super.raid_disks);
printf(" Total Devices : %d\n", super.nr_disks);
printf("Preferred Minor : %d\n", super.md_minor);
printf("\n");
atime = super.utime;
printf(" Update Time : %.24s\n", ctime(&atime));
printf(" State : %s\n",
(super.state&(1<<MD_SB_CLEAN))?"clean":"dirty");
printf(" Active Devices : %d\n", super.active_disks);
printf("Working Devices : %d\n", super.working_disks);
printf(" Failed Devices : %d\n", super.failed_disks);
printf(" Spare Devices : %d\n", super.spare_disks);
if (calc_sb_csum(&super) == super.sb_csum)
printf(" Checksum : %x - correct\n", super.sb_csum);
else
printf(" Checksum : %x - expected %lx\n", super.sb_csum, calc_sb_csum(&super));
if (SparcAdjust) {
/* 2.2 sparc put the events in the wrong place
* So we copy the tail of the superblock
* up 4 bytes before continuing
*/
__u32 *sb32 = (__u32*)&super;
memcpy(sb32+MD_SB_GENERIC_CONSTANT_WORDS+7,
sb32+MD_SB_GENERIC_CONSTANT_WORDS+7+1,
(MD_SB_WORDS - (MD_SB_GENERIC_CONSTANT_WORDS+7+1))*4);
printf (" --- adjusting superblock for 2.2/sparc compatability ---\n");
}
printf(" Events : %d.%d\n", super.events_hi, super.events_lo);
if (super.events_hi == super.cp_events_hi &&
super.events_lo == super.cp_events_lo &&
super.recovery_cp > 0 &&
(super.state & (1<<MD_SB_CLEAN)) == 0 )
printf("Sync checkpoint : %d KB (%d%%)\n", super.recovery_cp/2, super.recovery_cp/(super.size/100*2));
printf("\n");
if (super.level == 5) {
c = map_num(r5layout, super.layout);
printf(" Layout : %s\n", c?c:"-unknown-");
}
if (super.level == 10)
printf(" Layout : near=%d, far=%d\n",
super.layout&255, (super.layout>>8) & 255);
switch(super.level) {
case 0:
case 4:
case 5:
printf(" Chunk Size : %dK\n", super.chunk_size/1024);
break;
case -1:
printf(" Rounding : %dK\n", super.chunk_size/1024);
break;
default: break;
}
printf("\n");
printf(" Number Major Minor RaidDevice State\n");
for (d= -1; d<(signed int)(super.raid_disks+super.spare_disks); d++) {
mdp_disk_t *dp;
char *dv;
char nb[5];
if (d>=0) dp = &super.disks[d];
else dp = &super.this_disk;
sprintf(nb, "%4d", d);
printf("%4s %5d %5d %5d %5d ", d < 0 ? "this" : nb,
dp->number, dp->major, dp->minor, dp->raid_disk);
if (dp->state & (1<<MD_DISK_FAULTY)) printf(" faulty");
if (dp->state & (1<<MD_DISK_ACTIVE)) printf(" active");
if (dp->state & (1<<MD_DISK_SYNC)) printf(" sync");
if (dp->state & (1<<MD_DISK_REMOVED)) printf(" removed");
if (dp->state == 0) { printf(" spare"); spares++; }
if ((dv=map_dev(dp->major, dp->minor)))
printf(" %s", dv);
printf("\n");
if (d == -1) printf("\n");
}
}
if (SparcAdjust == 2) {
printf(" ----- updating superblock on device ----\n");
fd = open(devlist->devname, O_RDWR);
if (fd < 0) {
fprintf(stderr, Name ": cannot open %s to update superblock: %s\n",
devlist->devname, strerror(errno));
err = 1;
} else {
super.sb_csum = calc_sb_csum(&super);
if (store_super(fd, &super)) {
fprintf(stderr, Name ": Count not re-write superblock on %s\n",
devlist->devname);
err = 1;
}
close(fd);
}
}
}
if (brief) {
struct array *ap;
for (ap=arrays; ap; ap=ap->next) {
char sep='=';
char *c=map_num(pers, ap->super.level);
char *d;
printf("ARRAY %s level=%s num-devices=%d UUID=",
get_md_name(ap->super.md_minor),
c?c:"-unknown-", ap->super.raid_disks);
if (spares) printf(" spares=%d", spares);
if (ap->super.minor_version >= 90)
printf("%08x:%08x:%08x:%08x", ap->super.set_uuid0, ap->super.set_uuid1,
ap->super.set_uuid2, ap->super.set_uuid3);
else
printf("%08x", ap->super.set_uuid0);
printf("\n devices");
for (d=dl_next(ap->devs); d!= ap->devs; d=dl_next(d)) {
printf("%c%s", sep, d);
sep=',';
}
printf("\n");
}
}
return rv;
}
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