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