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-rw-r--r--super0.c539
1 files changed, 539 insertions, 0 deletions
diff --git a/super0.c b/super0.c
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+/*
+ * mdadm - manage Linux "md" devices aka RAID arrays.
+ *
+ * Copyright (C) 2001-2004 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"
+
+/*
+ * All handling for the 0.90.0 version superblock is in
+ * this file.
+ * This includes:
+ * - finding, loading, and writing the superblock.
+ * - initialising a new superblock
+ * - printing the superblock for --examine
+ * - printing part of the superblock for --detail
+ * .. other stuff
+ */
+
+
+static unsigned long calc_sb0_csum(mdp_super_t *super)
+{
+ unsigned long csum = super->sb_csum;
+ unsigned long newcsum;
+ super->sb_csum= 0 ;
+ newcsum = calc_csum(super, MD_SB_BYTES);
+ super->sb_csum = csum;
+ return newcsum;
+}
+
+void examine_super0(void *sbv)
+{
+ mdp_super_t *sb = sbv;
+ time_t atime;
+ int d;
+ char *c;
+
+ printf(" Magic : %08x\n", sb->md_magic);
+ printf(" Version : %02d.%02d.%02d\n", sb->major_version, sb->minor_version,
+ sb->patch_version);
+ if (sb->minor_version >= 90)
+ printf(" UUID : %08x:%08x:%08x:%08x\n", sb->set_uuid0, sb->set_uuid1,
+ sb->set_uuid2, sb->set_uuid3);
+ else
+ printf(" UUID : %08x\n", sb->set_uuid0);
+
+ atime = sb->ctime;
+ printf(" Creation Time : %.24s\n", ctime(&atime));
+ c=map_num(pers, sb->level);
+ printf(" Raid Level : %s\n", c?c:"-unknown-");
+ if ((int)sb->level >= 0)
+ printf(" Device Size : %d%s\n", sb->size, human_size((long long)sb->size<<10));
+ printf(" Raid Devices : %d\n", sb->raid_disks);
+ printf(" Total Devices : %d\n", sb->nr_disks);
+ printf("Preferred Minor : %d\n", sb->md_minor);
+ printf("\n");
+ atime = sb->utime;
+ printf(" Update Time : %.24s\n", ctime(&atime));
+ printf(" State : %s\n",
+ (sb->state&(1<<MD_SB_CLEAN))?"clean":"active");
+ printf(" Active Devices : %d\n", sb->active_disks);
+ printf("Working Devices : %d\n", sb->working_disks);
+ printf(" Failed Devices : %d\n", sb->failed_disks);
+ printf(" Spare Devices : %d\n", sb->spare_disks);
+ if (calc_sb0_csum(sb) == sb->sb_csum)
+ printf(" Checksum : %x - correct\n", sb->sb_csum);
+ else
+ printf(" Checksum : %x - expected %lx\n", sb->sb_csum, calc_sb0_csum(sb));
+ printf(" Events : %d.%d\n", sb->events_hi, sb->events_lo);
+ printf("\n");
+ if (sb->level == 5) {
+ c = map_num(r5layout, sb->layout);
+ printf(" Layout : %s\n", c?c:"-unknown-");
+ }
+ switch(sb->level) {
+ case 0:
+ case 4:
+ case 5:
+ printf(" Chunk Size : %dK\n", sb->chunk_size/1024);
+ break;
+ case -1:
+ printf(" Rounding : %dK\n", sb->chunk_size/1024);
+ break;
+ default: break;
+ }
+ printf("\n");
+ printf(" Number Major Minor RaidDevice State\n");
+ for (d= -1; d<(signed int)(sb->raid_disks+sb->spare_disks); d++) {
+ mdp_disk_t *dp;
+ char *dv;
+ char nb[5];
+ if (d>=0) dp = &sb->disks[d];
+ else dp = &sb->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");
+ if ((dv=map_dev(dp->major, dp->minor)))
+ printf(" %s", dv);
+ printf("\n");
+ if (d == -1) printf("\n");
+ }
+}
+
+void brief_examine_super0(void *sbv)
+{
+ mdp_super_t *sb = sbv;
+ char *c=map_num(pers, sb->level);
+
+ printf("ARRAY %s level=%s num-devices=%d UUID=",
+ get_md_name(sb->md_minor),
+ c?c:"-unknown-", sb->raid_disks);
+ if (sb->minor_version >= 90)
+ printf("%08x:%08x:%08x:%08x", sb->set_uuid0, sb->set_uuid1,
+ sb->set_uuid2, sb->set_uuid3);
+ else
+ printf("%08x", sb->set_uuid0);
+ printf("\n");
+}
+
+void detail_super0(void *sbv)
+{
+ mdp_super_t *sb = sbv;
+ printf(" UUID : ");
+ if (sb->minor_version >= 90)
+ printf("%08x:%08x:%08x:%08x", sb->set_uuid0, sb->set_uuid1,
+ sb->set_uuid2, sb->set_uuid3);
+ else
+ printf("%08x", sb->set_uuid0);
+ printf("\n Events : %d.%d\n\n", sb->events_hi, sb->events_lo);
+}
+
+void brief_detail_super0(void *sbv)
+{
+ mdp_super_t *sb = sbv;
+ printf(" UUID=");
+ if (sb->minor_version >= 90)
+ printf("%08x:%08x:%08x:%08x", sb->set_uuid0, sb->set_uuid1,
+ sb->set_uuid2, sb->set_uuid3);
+ else
+ printf("%08x", sb->set_uuid0);
+}
+
+void uuid_from_super0(int uuid[4], void * sbv)
+{
+ mdp_super_t *super = sbv;
+ uuid[0] = super->set_uuid0;
+ if (super->minor_version >= 90) {
+ uuid[1] = super->set_uuid1;
+ uuid[2] = super->set_uuid2;
+ uuid[3] = super->set_uuid3;
+ } else {
+ uuid[1] = 0;
+ uuid[2] = 0;
+ uuid[3] = 0;
+ }
+}
+
+void getinfo_super0(struct mdinfo *info, void *sbv)
+{
+ mdp_super_t *sb = sbv;
+ int working = 0;
+ int i;
+
+ info->array.major_version = sb->major_version;
+ info->array.minor_version = sb->minor_version;
+ info->array.patch_version = sb->patch_version;
+ info->array.raid_disks = sb->raid_disks;
+ info->array.level = sb->level;
+ info->array.md_minor = sb->md_minor;
+ info->array.ctime = sb->ctime;
+
+ info->disk.state = sb->this_disk.state;
+ info->disk.major = sb->this_disk.major;
+ info->disk.minor = sb->this_disk.minor;
+ info->disk.raid_disk = sb->this_disk.raid_disk;
+
+ info->events = md_event(sb);
+
+ uuid_from_super0(info->uuid, sbv);
+
+ /* work_disks is calculated rather than read directly */
+ for (i=0; i < MD_SB_DISKS; i++)
+ if ((sb->disks[i].state & (1<<MD_DISK_SYNC)) &&
+ (sb->disks[i].state & (1<<MD_DISK_ACTIVE)) &&
+ !(sb->disks[i].state & (1<<MD_DISK_FAULTY)))
+ working ++;
+ info->array.working_disks = working;
+}
+
+
+int update_super0(struct mdinfo *info, void *sbv, char *update, char *devname, int verbose)
+{
+ int rv = 0;
+ mdp_super_t *sb = sbv;
+ if (strcmp(update, "sparc2.2")==0 ) {
+ /* 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*)sb;
+ 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);
+ fprintf (stderr, Name ": adjusting superblock of %s for 2.2/sparc compatability.\n",
+ devname);
+ }
+ if (strcmp(update, "super-minor") ==0) {
+ sb->md_minor = info->array.md_minor;
+ if (verbose)
+ fprintf(stderr, Name ": updating superblock of %s with minor number %d\n",
+ devname, info->array.md_minor);
+ }
+ if (strcmp(update, "summaries") == 0) {
+ int i;
+ /* set nr_disks, active_disks, working_disks,
+ * failed_disks, spare_disks based on disks[]
+ * array in superblock.
+ * Also make sure extra slots aren't 'failed'
+ */
+ sb->nr_disks = sb->active_disks =
+ sb->working_disks = sb->failed_disks =
+ sb->spare_disks = 0;
+ for (i=0; i < MD_SB_DISKS ; i++)
+ if (sb->disks[i].major ||
+ sb->disks[i].minor) {
+ int state = sb->disks[i].state;
+ if (state & (1<<MD_DISK_REMOVED))
+ continue;
+ sb->nr_disks++;
+ if (state & (1<<MD_DISK_ACTIVE))
+ sb->active_disks++;
+ if (state & (1<<MD_DISK_FAULTY))
+ sb->failed_disks++;
+ else
+ sb->working_disks++;
+ if (state == 0)
+ sb->spare_disks++;
+ } else if (i >= sb->raid_disks && sb->disks[i].number == 0)
+ sb->disks[i].state = 0;
+ }
+ if (strcmp(update, "force")==0) {
+ sb->events_hi = (info->events>>32) & 0xFFFFFFFF;
+ sb->events_lo = (info->events) & 0xFFFFFFFF;
+ if (sb->level == 5 || sb->level == 4 || sb->level == 6)
+ /* need to force clean */
+ sb->state |= (1 << MD_SB_CLEAN);
+ }
+ if (strcmp(update, "assemble")==0) {
+ int d = info->disk.number;
+ if (sb->disks[d].state != info->disk.state) {
+ sb->disks[d].state = info->disk.state;
+ rv = 1;
+ }
+ }
+ if (strcmp(update, "newdev") == 0) {
+ int d = info->disk.number;
+ memset(&sb->disks[d], 0, sizeof(sb->disks[d]));
+ sb->disks[d].number = d;
+ sb->disks[d].major = info->disk.major;
+ sb->disks[d].minor = info->disk.minor;
+ sb->disks[d].raid_disk = info->disk.raid_disk;
+ sb->disks[d].state = info->disk.state;
+ sb->this_disk = sb->disks[d];
+ }
+ if (strcmp(update, "grow") == 0) {
+ sb->raid_disks = info->array.raid_disks;
+ sb->nr_disks = info->array.nr_disks;
+ sb->active_disks = info->array.active_disks;
+ sb->working_disks = info->array.working_disks;
+ memset(&sb->disks[info->disk.number], 0, sizeof(sb->disks[0]));
+ sb->disks[info->disk.number].number = info->disk.number;
+ sb->disks[info->disk.number].major = info->disk.major;
+ sb->disks[info->disk.number].minor = info->disk.minor;
+ sb->disks[info->disk.number].raid_disk = info->disk.raid_disk;
+ sb->disks[info->disk.number].state = info->disk.state;
+ if (sb->this_disk.number == info->disk.number)
+ sb->this_disk = sb->disks[info->disk.number];
+ }
+ if (strcmp(update, "resync") == 0) {
+ /* make sure resync happens */
+ sb->state &= ~(1<<MD_SB_CLEAN);
+ sb->recovery_cp = 0;
+ }
+
+ sb->sb_csum = calc_sb0_csum(sb);
+ return rv;
+}
+
+__u64 event_super0(void *sbv)
+{
+ mdp_super_t *sb = sbv;
+ return md_event(sb);
+}
+
+
+
+void init_super0(void **sbp, mdu_array_info_t *info)
+{
+ mdp_super_t *sb = malloc(MD_SB_BYTES);
+ memset(sb, 0, MD_SB_BYTES);
+
+ sb->md_magic = MD_SB_MAGIC;
+ sb->major_version = 0;
+ sb->minor_version = 90;
+ sb->patch_version = 0;
+ sb->gvalid_words = 0; /* ignored */
+ sb->set_uuid0 = random();
+ sb->ctime = time(0);
+ sb->level = info->level;
+ sb->size = info->size;
+ sb->nr_disks = info->nr_disks;
+ sb->raid_disks = info->raid_disks;
+ sb->md_minor = info->md_minor;
+ sb->not_persistent = 0;
+ sb->set_uuid1 = random();
+ sb->set_uuid2 = random();
+ sb->set_uuid3 = random();
+
+ sb->utime = sb->ctime;
+ sb->state = info->state;
+ sb->active_disks = info->active_disks;
+ sb->working_disks = info->working_disks;
+ sb->failed_disks = info->failed_disks;
+ sb->events_hi = 0;
+ sb->events_lo = 1;
+
+ sb->layout = info->layout;
+ sb->chunk_size = info->chunk_size;
+
+ *sbp = sb;
+}
+
+/* Add a device to the superblock being created */
+void add_to_super0(void *sbv, mdu_disk_info_t *dinfo)
+{
+ mdp_super_t *sb = sbv;
+ mdp_disk_t *dk = &sb->disks[dinfo->number];
+
+ dk->number = dinfo->number;
+ dk->major = dinfo->major;
+ dk->minor = dinfo->minor;
+ dk->raid_disk = dinfo->raid_disk;
+ dk->state = dinfo->state;
+}
+
+int store_super0(int fd, mdp_super_t *super)
+{
+ unsigned long size;
+ unsigned long long dsize;
+ unsigned long long offset;
+
+#ifdef BLKGETSIZE64
+ if (ioctl(fd, BLKGETSIZE64, &dsize) != 0)
+#endif
+ {
+ if (ioctl(fd, BLKGETSIZE, &size))
+ return 1;
+ else
+ dsize = ((unsigned long long)size)<<9;
+ }
+
+ if (dsize < MD_RESERVED_SECTORS*2)
+ return 2;
+
+ offset = MD_NEW_SIZE_SECTORS(dsize>>9);
+
+ offset *= 512;
+
+ if (lseek64(fd, offset, 0)< 0LL)
+ return 3;
+
+ if (write(fd, super, sizeof(*super)) != sizeof(*super))
+ return 4;
+
+ return 0;
+}
+
+int write_init_super0(void *sbv, mdu_disk_info_t *dinfo, char *devname)
+{
+ mdp_super_t *sb = sbv;
+ int fd = open(devname, O_RDWR, O_EXCL);
+ int rv;
+
+ if (fd < 0) {
+ fprintf(stderr, Name ": Failed to open %s to write superblock\n", devname);
+ return -1;
+ }
+
+ sb->this_disk = sb->disks[dinfo->number];
+ sb->sb_csum = calc_sb0_csum(sb);
+ rv = store_super0(fd, sb);
+ close(fd);
+ if (rv)
+ fprintf(stderr, Name ": failed to write superblock to %s\n", devname);
+ return rv;
+}
+
+int compare_super0(void **firstp, void *secondv)
+{
+ /*
+ * return:
+ * 0 same, or first was empty, and second was copied
+ * 1 second had wrong number
+ * 2 wrong uuid
+ * 3 wrong other info
+ */
+ mdp_super_t *first = *firstp;
+ mdp_super_t *second = secondv;
+
+ int uuid1[4], uuid2[4];
+ if (second->md_magic != MD_SB_MAGIC)
+ return 1;
+ if (!first) {
+ first = malloc(MD_SB_BYTES);
+ memcpy(first, second, MD_SB_BYTES);
+ *firstp = first;
+ return 0;
+ }
+
+ uuid_from_super0(uuid1, first);
+ uuid_from_super0(uuid2, second);
+ if (!same_uuid(uuid1, uuid2))
+ return 2;
+ if (first->major_version != second->major_version ||
+ first->minor_version != second->minor_version ||
+ first->patch_version != second->patch_version ||
+ first->gvalid_words != second->gvalid_words ||
+ first->ctime != second->ctime ||
+ first->level != second->level ||
+ first->size != second->size ||
+ first->raid_disks != second->raid_disks )
+ return 3;
+
+ return 0;
+}
+
+
+int load_super0(int fd, void **sbp, char *devname)
+{
+ /* try to read in the superblock
+ * Return:
+ * 0 on success
+ * 1 on cannot get superblock
+ * 2 on superblock meaningless
+ */
+ unsigned long size;
+ unsigned long long dsize;
+ unsigned long long offset;
+ mdp_super_t *super;
+
+#ifdef BLKGETSIZE64
+ if (ioctl(fd, BLKGETSIZE64, &dsize) != 0)
+#endif
+ {
+ if (ioctl(fd, BLKGETSIZE, &size)) {
+ if (devname)
+ fprintf(stderr, Name ": cannot find device size for %s: %s\n",
+ devname, strerror(errno));
+ return 1;
+ } else
+ dsize = size << 9;
+ }
+
+ if (dsize < MD_RESERVED_SECTORS*2) {
+ if (devname)
+ fprintf(stderr, Name ": %s is too small for md: size is %ld sectors.\n",
+ devname, size);
+ return 1;
+ }
+
+ offset = MD_NEW_SIZE_SECTORS(dsize>>9);
+
+ offset *= 512;
+
+ ioctl(fd, BLKFLSBUF, 0); /* make sure we read current data */
+
+ if (lseek64(fd, offset, 0)< 0LL) {
+ if (devname)
+ fprintf(stderr, Name ": Cannot seek to superblock on %s: %s\n",
+ devname, strerror(errno));
+ return 1;
+ }
+
+ super = malloc(MD_SB_BYTES);
+
+ if (read(fd, super, sizeof(*super)) != MD_SB_BYTES) {
+ if (devname)
+ fprintf(stderr, Name ": Cannot read superblock on %s\n",
+ devname);
+ free(super);
+ return 1;
+ }
+
+ if (super->md_magic != MD_SB_MAGIC) {
+ if (devname)
+ fprintf(stderr, Name ": No super block found on %s (Expected magic %08x, got %08x)\n",
+ devname, MD_SB_MAGIC, super->md_magic);
+ free(super);
+ return 2;
+ }
+
+ if (super->major_version != 0) {
+ if (devname)
+ fprintf(stderr, Name ": Cannot interpret superblock on %s - version is %d\n",
+ devname, super->major_version);
+ free(super);
+ return 2;
+ }
+ *sbp = super;
+ return 0;
+}
generated by cgit (git 2.34.1) at 2024-11-11 18:25:30 +0000