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-rw-r--r--super0.c1350
1 files changed, 1350 insertions, 0 deletions
diff --git a/super0.c b/super0.c
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index 0000000..b79b97a
--- /dev/null
+++ b/super0.c
@@ -0,0 +1,1350 @@
+/*
+ * mdadm - manage Linux "md" devices aka RAID arrays.
+ *
+ * Copyright (C) 2001-2009 Neil Brown <neilb@suse.de>
+ *
+ *
+ * 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@suse.de>
+ */
+
+#define HAVE_STDINT_H 1
+#include "mdadm.h"
+#include "sha1.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;
+}
+
+static void super0_swap_endian(struct mdp_superblock_s *sb)
+{
+ /* as super0 superblocks are host-endian, it is sometimes
+ * useful to be able to swap the endianness
+ * as (almost) everything is u32's we byte-swap every 4byte
+ * number.
+ * We then also have to swap the events_hi and events_lo
+ */
+ char *sbc = (char *)sb;
+ __u32 t32;
+ int i;
+
+ for (i=0; i < MD_SB_BYTES ; i+=4) {
+ char t = sbc[i];
+ sbc[i] = sbc[i+3];
+ sbc[i+3] = t;
+ t=sbc[i+1];
+ sbc[i+1]=sbc[i+2];
+ sbc[i+2]=t;
+ }
+ t32 = sb->events_hi;
+ sb->events_hi = sb->events_lo;
+ sb->events_lo = t32;
+
+ t32 = sb->cp_events_hi;
+ sb->cp_events_hi = sb->cp_events_lo;
+ sb->cp_events_lo = t32;
+
+}
+
+static void examine_super0(struct supertype *st, char *homehost)
+{
+ mdp_super_t *sb = st->sb;
+ time_t atime;
+ int d;
+ int delta_extra = 0;
+ char *c;
+
+ printf(" Magic : %08x\n", sb->md_magic);
+ printf(" Version : %d.%02d.%02d\n",
+ sb->major_version, sb->minor_version, sb->patch_version);
+ if (sb->minor_version >= 90) {
+ printf(" UUID : %08x:%08x:%08x:%08x", sb->set_uuid0,
+ sb->set_uuid1, sb->set_uuid2, sb->set_uuid3);
+ if (homehost) {
+ char buf[20];
+ void *hash;
+
+ hash = sha1_buffer(homehost, strlen(homehost), buf);
+ if (memcmp(&sb->set_uuid2, hash, 8) == 0)
+ printf(" (local to host %s)", homehost);
+ }
+ printf("\n");
+ } else
+ printf(" UUID : %08x\n", sb->set_uuid0);
+
+ if (sb->not_persistent)
+ printf(" Eedk : not persistent\n");
+
+ 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) {
+ int ddsks = 0, ddsks_denom = 1;
+ printf(" Used Dev Size : %d%s\n", sb->size,
+ human_size((long long)sb->size<<10));
+ switch(sb->level) {
+ case 1:
+ ddsks=1;
+ break;
+ case 4:
+ case 5:
+ ddsks = sb->raid_disks - 1;
+ break;
+ case 6:
+ ddsks = sb->raid_disks - 2;
+ break;
+ case 10:
+ ddsks = sb->raid_disks;
+ ddsks_denom =
+ (sb->layout & 255) * ((sb->layout >> 8) & 255);
+ }
+ if (ddsks) {
+ long long asize = sb->size;
+ asize = (asize << 10) * ddsks / ddsks_denom;
+ printf(" Array Size : %llu%s\n",
+ asize >> 10, human_size(asize));
+ }
+ }
+ 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");
+ if (sb->minor_version > 90 && (sb->reshape_position + 1) != 0) {
+ printf(" Reshape pos'n : %llu%s\n",
+ (unsigned long long)sb->reshape_position / 2,
+ human_size((long long)sb->reshape_position << 9));
+ if (sb->delta_disks) {
+ printf(" Delta Devices : %d", sb->delta_disks);
+ printf(" (%d->%d)\n", sb->raid_disks-sb->delta_disks,
+ sb->raid_disks);
+ if (((int)sb->delta_disks) < 0)
+ delta_extra = - sb->delta_disks;
+ }
+ if (sb->new_level != sb->level) {
+ c = map_num(pers, sb->new_level);
+ printf(" New Level : %s\n", c?c:"-unknown-");
+ }
+ if (sb->new_layout != sb->layout) {
+ if (sb->level == 5) {
+ c = map_num(r5layout, sb->new_layout);
+ printf(" New Layout : %s\n",
+ c?c:"-unknown-");
+ }
+ if (sb->level == 6) {
+ c = map_num(r6layout, sb->new_layout);
+ printf(" New Layout : %s\n",
+ c?c:"-unknown-");
+ }
+ if (sb->level == 10) {
+ printf(" New Layout : near=%d, %s=%d\n",
+ sb->new_layout&255,
+ (sb->new_layout&0x10000)?"offset":"far",
+ (sb->new_layout>>8)&255);
+ }
+ }
+ if (sb->new_chunk != sb->chunk_size)
+ printf(" New Chunksize : %d\n", sb->new_chunk);
+ printf("\n");
+ }
+ atime = sb->utime;
+ printf(" Update Time : %.24s\n", ctime(&atime));
+ printf(" State : %s\n",
+ (sb->state&(1 << MD_SB_CLEAN)) ? "clean":"active");
+ if (sb->state & (1 << MD_SB_BITMAP_PRESENT))
+ printf("Internal Bitmap : present\n");
+ 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 : %llu\n",
+ ((unsigned long long)sb->events_hi << 32) + sb->events_lo);
+ printf("\n");
+ if (sb->level == 5) {
+ c = map_num(r5layout, sb->layout);
+ printf(" Layout : %s\n", c?c:"-unknown-");
+ }
+ if (sb->level == 6) {
+ c = map_num(r6layout, sb->layout);
+ printf(" Layout : %s\n", c?c:"-unknown-");
+ }
+ if (sb->level == 10) {
+ printf(" Layout :");
+ print_r10_layout(sb->layout);
+ printf("\n");
+ }
+ switch(sb->level) {
+ case 0:
+ case 4:
+ case 5:
+ case 6:
+ case 10:
+ 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 + delta_extra + sb->spare_disks);
+ d++) {
+ mdp_disk_t *dp;
+ char *dv;
+ char nb[11];
+ int wonly, failfast;
+ if (d>=0) dp = &sb->disks[d];
+ else dp = &sb->this_disk;
+ snprintf(nb, sizeof(nb), "%4d", d);
+ printf("%4s %5d %5d %5d %5d ", d < 0 ? "this" : nb,
+ dp->number, dp->major, dp->minor, dp->raid_disk);
+ wonly = dp->state & (1 << MD_DISK_WRITEMOSTLY);
+ failfast = dp->state & (1<<MD_DISK_FAILFAST);
+ dp->state &= ~(wonly | failfast);
+ 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 (wonly)
+ printf(" write-mostly");
+ if (failfast)
+ printf(" failfast");
+ if (dp->state == 0)
+ printf(" spare");
+ if ((dv = map_dev(dp->major, dp->minor, 0)))
+ printf(" %s", dv);
+ printf("\n");
+ if (d == -1)
+ printf("\n");
+ }
+}
+
+static void brief_examine_super0(struct supertype *st, int verbose)
+{
+ mdp_super_t *sb = st->sb;
+ char *c=map_num(pers, sb->level);
+ char devname[20];
+
+ sprintf(devname, "/dev/md%d", sb->md_minor);
+
+ if (verbose) {
+ printf("ARRAY %s level=%s num-devices=%d",
+ devname,
+ c?c:"-unknown-", sb->raid_disks);
+ } else
+ printf("ARRAY %s", devname);
+
+ if (sb->minor_version >= 90)
+ printf(" UUID=%08x:%08x:%08x:%08x", sb->set_uuid0, sb->set_uuid1,
+ sb->set_uuid2, sb->set_uuid3);
+ else
+ printf(" UUID=%08x", sb->set_uuid0);
+ printf("\n");
+}
+
+static void export_examine_super0(struct supertype *st)
+{
+ mdp_super_t *sb = st->sb;
+
+ printf("MD_LEVEL=%s\n", map_num(pers, sb->level));
+ printf("MD_DEVICES=%d\n", sb->raid_disks);
+ if (sb->minor_version >= 90)
+ printf("MD_UUID=%08x:%08x:%08x:%08x\n",
+ sb->set_uuid0, sb->set_uuid1,
+ sb->set_uuid2, sb->set_uuid3);
+ else
+ printf("MD_UUID=%08x\n", sb->set_uuid0);
+ printf("MD_UPDATE_TIME=%llu\n",
+ __le64_to_cpu(sb->ctime) & 0xFFFFFFFFFFULL);
+ printf("MD_EVENTS=%llu\n",
+ ((unsigned long long)sb->events_hi << 32)
+ + sb->events_lo);
+}
+
+static int copy_metadata0(struct supertype *st, int from, int to)
+{
+ /* Read 64K from the appropriate offset of 'from'
+ * and if it looks a little like a 0.90 superblock,
+ * write it to the same offset of 'to'
+ */
+ void *buf;
+ unsigned long long dsize, offset;
+ const int bufsize = 64*1024;
+ mdp_super_t *super;
+
+ if (posix_memalign(&buf, 4096, bufsize) != 0)
+ return 1;
+
+ if (!get_dev_size(from, NULL, &dsize))
+ goto err;
+
+ if (dsize < MD_RESERVED_SECTORS*512)
+ goto err;
+
+ offset = MD_NEW_SIZE_SECTORS(dsize>>9);
+
+ offset *= 512;
+
+ if (lseek64(from, offset, 0) < 0LL)
+ goto err;
+ if (read(from, buf, bufsize) != bufsize)
+ goto err;
+
+ if (lseek64(to, offset, 0) < 0LL)
+ goto err;
+ super = buf;
+ if (super->md_magic != MD_SB_MAGIC ||
+ super->major_version != 0 ||
+ calc_sb0_csum(super) != super->sb_csum)
+ goto err;
+ if (write(to, buf, bufsize) != bufsize)
+ goto err;
+ free(buf);
+ return 0;
+err:
+ free(buf);
+ return 1;
+}
+
+static void detail_super0(struct supertype *st, char *homehost, char *subarray)
+{
+ mdp_super_t *sb = st->sb;
+ 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);
+ if (homehost) {
+ char buf[20];
+ void *hash = sha1_buffer(homehost,
+ strlen(homehost),
+ buf);
+ if (memcmp(&sb->set_uuid2, hash, 8)==0)
+ printf(" (local to host %s)", homehost);
+ }
+ printf("\n Events : %d.%d\n\n", sb->events_hi, sb->events_lo);
+}
+
+static void brief_detail_super0(struct supertype *st, char *subarray)
+{
+ mdp_super_t *sb = st->sb;
+ 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);
+}
+
+static int match_home0(struct supertype *st, char *homehost)
+{
+ mdp_super_t *sb = st->sb;
+ char buf[20];
+ char *hash;
+
+ if (!homehost)
+ return 0;
+ hash = sha1_buffer(homehost,
+ strlen(homehost),
+ buf);
+
+ return (memcmp(&sb->set_uuid2, hash, 8)==0);
+}
+
+static void uuid_from_super0(struct supertype *st, int uuid[4])
+{
+ mdp_super_t *super = st->sb;
+ 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;
+ }
+}
+
+static void getinfo_super0(struct supertype *st, struct mdinfo *info, char *map)
+{
+ mdp_super_t *sb = st->sb;
+ int working = 0;
+ int i;
+ int map_disks = info->array.raid_disks;
+
+ memset(info, 0, sizeof(*info));
+ 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.layout = sb->layout;
+ info->array.md_minor = sb->md_minor;
+ info->array.ctime = sb->ctime;
+ info->array.utime = sb->utime;
+ info->array.chunk_size = sb->chunk_size;
+ info->array.state = sb->state;
+ info->component_size = sb->size;
+ info->component_size *= 2;
+
+ if (sb->state & (1<<MD_SB_BITMAP_PRESENT))
+ info->bitmap_offset = 8;
+
+ 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->disk.number = sb->this_disk.number;
+
+ info->events = md_event(sb);
+ info->data_offset = 0;
+
+ sprintf(info->text_version, "0.%d", sb->minor_version);
+ info->safe_mode_delay = 200;
+
+ uuid_from_super0(st, info->uuid);
+
+ info->recovery_start = MaxSector;
+ if (sb->minor_version > 90 && (sb->reshape_position+1) != 0) {
+ info->reshape_active = 1;
+ info->reshape_progress = sb->reshape_position;
+ info->new_level = sb->new_level;
+ info->delta_disks = sb->delta_disks;
+ info->new_layout = sb->new_layout;
+ info->new_chunk = sb->new_chunk;
+ if (info->delta_disks < 0)
+ info->array.raid_disks -= info->delta_disks;
+ } else
+ info->reshape_active = 0;
+
+ info->recovery_blocked = info->reshape_active;
+
+ sprintf(info->name, "%d", sb->md_minor);
+ /* 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].raid_disk < (unsigned)info->array.raid_disks) &&
+ (sb->disks[i].state & (1<<MD_DISK_ACTIVE)) &&
+ !(sb->disks[i].state & (1<<MD_DISK_FAULTY))) {
+ working ++;
+ if (map && i < map_disks)
+ map[i] = 1;
+ } else if (map && i < map_disks)
+ map[i] = 0;
+ info->array.working_disks = working;
+}
+
+static struct mdinfo *container_content0(struct supertype *st, char *subarray)
+{
+ struct mdinfo *info;
+
+ if (subarray)
+ return NULL;
+
+ info = xmalloc(sizeof(*info));
+ getinfo_super0(st, info, NULL);
+ return info;
+}
+
+static int update_super0(struct supertype *st, struct mdinfo *info,
+ char *update,
+ char *devname, int verbose,
+ int uuid_set, char *homehost)
+{
+ /* NOTE: for 'assemble' and 'force' we need to return non-zero
+ * if any change was made. For others, the return value is
+ * ignored.
+ */
+ int rv = 0;
+ int uuid[4];
+ mdp_super_t *sb = st->sb;
+
+ if (strcmp(update, "homehost") == 0 &&
+ homehost) {
+ /* note that 'homehost' is special as it is really
+ * a "uuid" update.
+ */
+ uuid_set = 0;
+ update = "uuid";
+ info->uuid[0] = sb->set_uuid0;
+ info->uuid[1] = sb->set_uuid1;
+ }
+
+ 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;
+
+ memmove(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);
+ if (verbose >= 0)
+ pr_err("adjusting superblock of %s for 2.2/sparc compatibility.\n",
+ devname);
+ } else if (strcmp(update, "super-minor") ==0) {
+ sb->md_minor = info->array.md_minor;
+ if (verbose > 0)
+ pr_err("updating superblock of %s with minor number %d\n",
+ devname, info->array.md_minor);
+ } else if (strcmp(update, "summaries") == 0) {
+ unsigned 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;
+ } else if (strcmp(update, "force-one")==0) {
+ /* Not enough devices for a working array, so
+ * bring this one up-to-date.
+ */
+ __u32 ehi = sb->events_hi, elo = sb->events_lo;
+ sb->events_hi = (info->events>>32) & 0xFFFFFFFF;
+ sb->events_lo = (info->events) & 0xFFFFFFFF;
+ if (sb->events_hi != ehi ||
+ sb->events_lo != elo)
+ rv = 1;
+ } else if (strcmp(update, "force-array")==0) {
+ /* degraded array and 'force' requested, so
+ * maybe need to mark it 'clean'
+ */
+ if ((sb->level == 5 || sb->level == 4 || sb->level == 6) &&
+ (sb->state & (1 << MD_SB_CLEAN)) == 0) {
+ /* need to force clean */
+ sb->state |= (1 << MD_SB_CLEAN);
+ rv = 1;
+ }
+ } else if (strcmp(update, "assemble")==0) {
+ int d = info->disk.number;
+ int wonly = sb->disks[d].state & (1<<MD_DISK_WRITEMOSTLY);
+ int failfast = sb->disks[d].state & (1<<MD_DISK_FAILFAST);
+ int mask = (1<<MD_DISK_WRITEMOSTLY)|(1<<MD_DISK_FAILFAST);
+ int add = 0;
+ if (sb->minor_version >= 91)
+ /* During reshape we don't insist on everything
+ * being marked 'sync'
+ */
+ add = (1<<MD_DISK_SYNC);
+ if (((sb->disks[d].state & ~mask) | add) !=
+ (unsigned)info->disk.state) {
+ sb->disks[d].state = info->disk.state | wonly |failfast;
+ rv = 1;
+ }
+ if (info->reshape_active &&
+ sb->minor_version > 90 && (sb->reshape_position+1) != 0 &&
+ info->delta_disks >= 0 &&
+ info->reshape_progress < sb->reshape_position) {
+ sb->reshape_position = info->reshape_progress;
+ rv = 1;
+ }
+ if (info->reshape_active &&
+ sb->minor_version > 90 && (sb->reshape_position+1) != 0 &&
+ info->delta_disks < 0 &&
+ info->reshape_progress > sb->reshape_position) {
+ sb->reshape_position = info->reshape_progress;
+ rv = 1;
+ }
+ } else if (strcmp(update, "linear-grow-new") == 0) {
+ 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;
+ sb->this_disk = sb->disks[info->disk.number];
+ } else if (strcmp(update, "linear-grow-update") == 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;
+ } else if (strcmp(update, "resync") == 0) {
+ /* make sure resync happens */
+ sb->state &= ~(1<<MD_SB_CLEAN);
+ sb->recovery_cp = 0;
+ } else if (strcmp(update, "uuid") == 0) {
+ if (!uuid_set && homehost) {
+ char buf[20];
+ char *hash = sha1_buffer(homehost,
+ strlen(homehost),
+ buf);
+ memcpy(info->uuid+2, hash, 8);
+ }
+ sb->set_uuid0 = info->uuid[0];
+ sb->set_uuid1 = info->uuid[1];
+ sb->set_uuid2 = info->uuid[2];
+ sb->set_uuid3 = info->uuid[3];
+ if (sb->state & (1<<MD_SB_BITMAP_PRESENT)) {
+ struct bitmap_super_s *bm;
+ bm = (struct bitmap_super_s*)(sb+1);
+ uuid_from_super0(st, uuid);
+ memcpy(bm->uuid, uuid, 16);
+ }
+ } else if (strcmp(update, "metadata") == 0) {
+ /* Create some v1.0 metadata to match ours but make the
+ * ctime bigger. Also update info->array.*_version.
+ * We need to arrange that store_super writes out
+ * the v1.0 metadata.
+ * Not permitted for unclean array, or array with
+ * bitmap.
+ */
+ if (info->bitmap_offset) {
+ pr_err("Cannot update metadata when bitmap is present\n");
+ rv = -2;
+ } else if (info->array.state != 1) {
+ pr_err("Cannot update metadata on unclean array\n");
+ rv = -2;
+ } else {
+ info->array.major_version = 1;
+ info->array.minor_version = 0;
+ uuid_from_super0(st, info->uuid);
+ st->other = super1_make_v0(st, info, st->sb);
+ }
+ } else if (strcmp(update, "revert-reshape") == 0) {
+ rv = -2;
+ if (sb->minor_version <= 90)
+ pr_err("No active reshape to revert on %s\n",
+ devname);
+ else if (sb->delta_disks == 0)
+ pr_err("%s: Can only revert reshape which changes number of devices\n",
+ devname);
+ else {
+ int tmp;
+ int parity = sb->level == 6 ? 2 : 1;
+ rv = 0;
+
+ if (sb->level >= 4 && sb->level <= 6 &&
+ sb->reshape_position % (
+ sb->new_chunk/512 *
+ (sb->raid_disks - sb->delta_disks - parity))) {
+ pr_err("Reshape position is not suitably aligned.\n");
+ pr_err("Try normal assembly and stop again\n");
+ return -2;
+ }
+ sb->raid_disks -= sb->delta_disks;
+ sb->delta_disks = -sb->delta_disks;
+
+ tmp = sb->new_layout;
+ sb->new_layout = sb->layout;
+ sb->layout = tmp;
+
+ tmp = sb->new_chunk;
+ sb->new_chunk = sb->chunk_size;
+ sb->chunk_size = tmp;
+ }
+ } else if (strcmp(update, "no-bitmap") == 0) {
+ sb->state &= ~(1<<MD_SB_BITMAP_PRESENT);
+ } else if (strcmp(update, "_reshape_progress")==0)
+ sb->reshape_position = info->reshape_progress;
+ else if (strcmp(update, "writemostly")==0)
+ sb->state |= (1<<MD_DISK_WRITEMOSTLY);
+ else if (strcmp(update, "readwrite")==0)
+ sb->state &= ~(1<<MD_DISK_WRITEMOSTLY);
+ else
+ rv = -1;
+
+ sb->sb_csum = calc_sb0_csum(sb);
+ return rv;
+}
+
+/*
+ * For version-0 superblock, the homehost is 'stored' in the uuid.
+ * 8 bytes for a hash of the host leaving 8 bytes of random material.
+ * We use the first 8 bytes (64bits) of the sha1 of the host name
+ */
+static int init_super0(struct supertype *st, mdu_array_info_t *info,
+ struct shape *s, char *ignored_name,
+ char *homehost, int *uuid,
+ unsigned long long data_offset)
+{
+ mdp_super_t *sb;
+ int spares;
+
+ if (data_offset != INVALID_SECTORS) {
+ pr_err("data-offset not support for 0.90\n");
+ return 0;
+ }
+
+ if (posix_memalign((void**)&sb, 4096,
+ MD_SB_BYTES + ROUND_UP(sizeof(bitmap_super_t), 4096)) != 0) {
+ pr_err("could not allocate superblock\n");
+ return 0;
+ }
+ memset(sb, 0, MD_SB_BYTES + sizeof(bitmap_super_t));
+
+ st->sb = sb;
+ if (info == NULL) {
+ /* zeroing the superblock */
+ return 0;
+ }
+
+ spares = info->working_disks - info->active_disks;
+ if (info->raid_disks + spares > MD_SB_DISKS) {
+ pr_err("too many devices requested: %d+%d > %d\n",
+ info->raid_disks , spares, MD_SB_DISKS);
+ return 0;
+ }
+
+ sb->md_magic = MD_SB_MAGIC;
+ sb->major_version = 0;
+ sb->minor_version = 90;
+ sb->patch_version = 0;
+ sb->gvalid_words = 0; /* ignored */
+ sb->ctime = time(0);
+ sb->level = info->level;
+ sb->size = s->size;
+ if (s->size != (unsigned long long)sb->size)
+ return 0;
+ sb->nr_disks = info->nr_disks;
+ sb->raid_disks = info->raid_disks;
+ sb->md_minor = info->md_minor;
+ sb->not_persistent = 0;
+ if (uuid) {
+ sb->set_uuid0 = uuid[0];
+ sb->set_uuid1 = uuid[1];
+ sb->set_uuid2 = uuid[2];
+ sb->set_uuid3 = uuid[3];
+ } else {
+ __u32 r[4];
+ random_uuid((__u8 *)r);
+ sb->set_uuid0 = r[0];
+ sb->set_uuid1 = r[1];
+ sb->set_uuid2 = r[2];
+ sb->set_uuid3 = r[3];
+ }
+ if (homehost && !uuid) {
+ char buf[20];
+ char *hash = sha1_buffer(homehost,
+ strlen(homehost),
+ buf);
+ memcpy(&sb->set_uuid2, hash, 8);
+ }
+
+ 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->spare_disks = info->spare_disks;
+ sb->events_hi = 0;
+ sb->events_lo = 1;
+
+ sb->layout = info->layout;
+ sb->chunk_size = info->chunk_size;
+
+ return 1;
+}
+
+struct devinfo {
+ int fd;
+ char *devname;
+ mdu_disk_info_t disk;
+ struct devinfo *next;
+};
+
+/* Add a device to the superblock being created */
+static int add_to_super0(struct supertype *st, mdu_disk_info_t *dinfo,
+ int fd, char *devname, unsigned long long data_offset)
+{
+ mdp_super_t *sb = st->sb;
+ mdp_disk_t *dk = &sb->disks[dinfo->number];
+ struct devinfo *di, **dip;
+
+ dk->number = dinfo->number;
+ dk->major = dinfo->major;
+ dk->minor = dinfo->minor;
+ dk->raid_disk = dinfo->raid_disk;
+ dk->state = dinfo->state & ((1<<MD_DISK_ACTIVE) |
+ (1<<MD_DISK_SYNC));
+
+ sb->this_disk = sb->disks[dinfo->number];
+ sb->sb_csum = calc_sb0_csum(sb);
+
+ dip = (struct devinfo **)&st->info;
+ while (*dip)
+ dip = &(*dip)->next;
+ di = xmalloc(sizeof(struct devinfo));
+ di->fd = fd;
+ di->devname = devname;
+ di->disk = *dinfo;
+ di->next = NULL;
+ *dip = di;
+
+ return 0;
+}
+
+static int store_super0(struct supertype *st, int fd)
+{
+ unsigned long long dsize;
+ unsigned long long offset;
+ mdp_super_t *super = st->sb;
+
+ if (!get_dev_size(fd, NULL, &dsize))
+ return 1;
+
+ if (dsize < MD_RESERVED_SECTORS*512)
+ return 2;
+
+ if (st->other) {
+ /* Writing out v1.0 metadata for --update=metadata */
+ int ret = 0;
+
+ offset = dsize/512 - 8*2;
+ offset &= ~(4*2-1);
+ offset *= 512;
+ if (lseek64(fd, offset, 0)< 0LL)
+ ret = 3;
+ else if (write(fd, st->other, 1024) != 1024)
+ ret = 4;
+ else
+ fsync(fd);
+ free(st->other);
+ st->other = NULL;
+ return ret;
+ }
+
+ 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;
+
+ if (super->state & (1<<MD_SB_BITMAP_PRESENT)) {
+ struct bitmap_super_s * bm = (struct bitmap_super_s*)(super+1);
+ if (__le32_to_cpu(bm->magic) == BITMAP_MAGIC)
+ if (write(fd, bm, ROUND_UP(sizeof(*bm),4096)) !=
+ ROUND_UP(sizeof(*bm),4096))
+ return 5;
+ }
+
+ fsync(fd);
+ return 0;
+}
+
+static int write_init_super0(struct supertype *st)
+{
+ mdp_super_t *sb = st->sb;
+ int rv = 0;
+ struct devinfo *di;
+
+ for (di = st->info ; di && ! rv ; di = di->next) {
+
+ if (di->disk.state & (1 << MD_DISK_FAULTY))
+ continue;
+ if (di->fd == -1)
+ continue;
+ while (Kill(di->devname, NULL, 0, -1, 1) == 0)
+ ;
+
+ sb->disks[di->disk.number].state &= ~(1<<MD_DISK_FAULTY);
+
+ sb->this_disk = sb->disks[di->disk.number];
+ sb->sb_csum = calc_sb0_csum(sb);
+ rv = store_super0(st, di->fd);
+
+ if (rv == 0 && (sb->state & (1<<MD_SB_BITMAP_PRESENT)))
+ rv = st->ss->write_bitmap(st, di->fd, NoUpdate);
+
+ if (rv)
+ pr_err("failed to write superblock to %s\n",
+ di->devname);
+ }
+ return rv;
+}
+
+static int compare_super0(struct supertype *st, struct supertype *tst,
+ int verbose)
+{
+ /*
+ * 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 = st->sb;
+ mdp_super_t *second = tst->sb;
+ int uuid1[4], uuid2[4];
+
+ if (second->md_magic != MD_SB_MAGIC)
+ return 1;
+ if (!first) {
+ if (posix_memalign((void**)&first, 4096,
+ MD_SB_BYTES +
+ ROUND_UP(sizeof(struct bitmap_super_s), 4096)) != 0) {
+ pr_err("could not allocate superblock\n");
+ return 1;
+ }
+ memcpy(first, second, MD_SB_BYTES + sizeof(struct bitmap_super_s));
+ st->sb = first;
+ return 0;
+ }
+
+ uuid_from_super0(st, uuid1);
+ uuid_from_super0(tst, uuid2);
+ if (!same_uuid(uuid1, uuid2, 0))
+ 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;
+}
+
+static void free_super0(struct supertype *st);
+
+static int load_super0(struct supertype *st, int fd, char *devname)
+{
+ /* try to read in the superblock
+ * Return:
+ * 0 on success
+ * 1 on cannot get superblock
+ * 2 on superblock meaningless
+ */
+ unsigned long long dsize;
+ unsigned long long offset;
+ mdp_super_t *super;
+ int uuid[4];
+ struct bitmap_super_s *bsb;
+
+ free_super0(st);
+
+ if (!get_dev_size(fd, devname, &dsize))
+ return 1;
+
+ if (dsize < MD_RESERVED_SECTORS*512) {
+ if (devname)
+ pr_err("%s is too small for md: size is %llu sectors.\n",
+ devname, dsize);
+ return 1;
+ }
+ st->devsize = dsize;
+
+ offset = MD_NEW_SIZE_SECTORS(dsize>>9);
+
+ offset *= 512;
+
+ if (lseek64(fd, offset, 0)< 0LL) {
+ if (devname)
+ pr_err("Cannot seek to superblock on %s: %s\n",
+ devname, strerror(errno));
+ return 1;
+ }
+
+ if (posix_memalign((void**)&super, 4096,
+ MD_SB_BYTES +
+ ROUND_UP(sizeof(bitmap_super_t), 4096)) != 0) {
+ pr_err("could not allocate superblock\n");
+ return 1;
+ }
+
+ if (read(fd, super, sizeof(*super)) != MD_SB_BYTES) {
+ if (devname)
+ pr_err("Cannot read superblock on %s\n",
+ devname);
+ free(super);
+ return 1;
+ }
+
+ if (st->ss && st->minor_version == 9)
+ super0_swap_endian(super);
+
+ if (super->md_magic != MD_SB_MAGIC) {
+ if (devname)
+ pr_err("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)
+ pr_err("Cannot interpret superblock on %s - version is %d\n",
+ devname, super->major_version);
+ free(super);
+ return 2;
+ }
+ st->sb = super;
+
+ if (st->ss == NULL) {
+ st->ss = &super0;
+ st->minor_version = super->minor_version;
+ st->max_devs = MD_SB_DISKS;
+ st->info = NULL;
+ }
+
+ /* Now check on the bitmap superblock */
+ if ((super->state & (1<<MD_SB_BITMAP_PRESENT)) == 0)
+ return 0;
+ /* Read the bitmap superblock and make sure it looks
+ * valid. If it doesn't clear the bit. An --assemble --force
+ * should get that written out.
+ */
+ if (read(fd, super+1, ROUND_UP(sizeof(struct bitmap_super_s),4096)) !=
+ ROUND_UP(sizeof(struct bitmap_super_s), 4096))
+ goto no_bitmap;
+
+ uuid_from_super0(st, uuid);
+ bsb = (struct bitmap_super_s *)(super+1);
+ if (__le32_to_cpu(bsb->magic) != BITMAP_MAGIC ||
+ memcmp(bsb->uuid, uuid, 16) != 0)
+ goto no_bitmap;
+ return 0;
+
+ no_bitmap:
+ super->state &= ~(1<<MD_SB_BITMAP_PRESENT);
+
+ return 0;
+}
+
+static struct supertype *match_metadata_desc0(char *arg)
+{
+ struct supertype *st = xcalloc(1, sizeof(*st));
+
+ st->container_devnm[0] = 0;
+ st->ss = &super0;
+ st->info = NULL;
+ st->minor_version = 90;
+ st->max_devs = MD_SB_DISKS;
+ st->sb = NULL;
+ /* we sometimes get 00.90 */
+ while (arg[0] == '0' && arg[1] == '0')
+ arg++;
+ if (strcmp(arg, "0") == 0 ||
+#ifdef DEFAULT_OLD_METADATA /* ifndef in super1.c */
+ strcmp(arg, "default") == 0 ||
+#endif /* DEFAULT_OLD_METADATA */
+ strcmp(arg, "0.90") == 0 ||
+ strcmp(arg, "") == 0 /* no metadata - i.e. non_persistent */
+ )
+ return st;
+
+ st->minor_version = 91; /* reshape in progress */
+ if (strcmp(arg, "0.91") == 0) /* For dup_super support */
+ return st;
+
+ st->minor_version = 9; /* flag for 'byte-swapped' */
+ if (strcmp(arg, "0.swap")==0 ||
+ strcmp(arg, "0.9") == 0) /* For dup_super support */
+ return st;
+
+ free(st);
+ return NULL;
+}
+
+static __u64 avail_size0(struct supertype *st, __u64 devsize,
+ unsigned long long data_offset)
+{
+ if (data_offset != 0 && data_offset != INVALID_SECTORS)
+ return 0ULL;
+ if (devsize < MD_RESERVED_SECTORS)
+ return 0ULL;
+ return MD_NEW_SIZE_SECTORS(devsize);
+}
+
+static int add_internal_bitmap0(struct supertype *st, int *chunkp,
+ int delay, int write_behind,
+ unsigned long long size, int may_change,
+ int major)
+{
+ /*
+ * The bitmap comes immediately after the superblock and must be 60K in size
+ * at most. The default size is between 30K and 60K
+ *
+ * size is in sectors, chunk is in bytes !!!
+ */
+ unsigned long long bits;
+ unsigned long long max_bits = (60*1024 - sizeof(bitmap_super_t))*8;
+ unsigned long long min_chunk;
+ int chunk = *chunkp;
+ mdp_super_t *sb = st->sb;
+ bitmap_super_t *bms = (bitmap_super_t*)(((char*)sb) + MD_SB_BYTES);
+ int uuid[4];
+
+ min_chunk = 4096; /* sub-page chunks don't work yet.. */
+ bits = (size * 512) / min_chunk + 1;
+ while (bits > max_bits) {
+ min_chunk *= 2;
+ bits = (bits+1)/2;
+ }
+ if (chunk == UnSet) {
+ /* A chunk size less than a few Megabytes gives poor
+ * performance without increasing resync noticeably
+ */
+ chunk = min_chunk;
+ if (chunk < 64*1024*1024)
+ chunk = 64*1024*1024;
+ } else if ((unsigned long long)chunk < min_chunk)
+ return -EINVAL; /* chunk size too small */
+
+ sb->state |= (1<<MD_SB_BITMAP_PRESENT);
+
+ memset(bms, 0, sizeof(*bms));
+ bms->magic = __cpu_to_le32(BITMAP_MAGIC);
+ bms->version = __cpu_to_le32(major);
+ uuid_from_super0(st, uuid);
+ memcpy(bms->uuid, uuid, 16);
+ bms->chunksize = __cpu_to_le32(chunk);
+ bms->daemon_sleep = __cpu_to_le32(delay);
+ bms->sync_size = __cpu_to_le64(size);
+ bms->write_behind = __cpu_to_le32(write_behind);
+ *chunkp = chunk;
+ return 0;
+}
+
+static int locate_bitmap0(struct supertype *st, int fd, int node_num)
+{
+ unsigned long long dsize;
+ unsigned long long offset;
+
+ if (!get_dev_size(fd, NULL, &dsize))
+ return -1;
+
+ if (dsize < MD_RESERVED_SECTORS*512)
+ return -1;
+
+ offset = MD_NEW_SIZE_SECTORS(dsize>>9);
+
+ offset *= 512;
+
+ offset += MD_SB_BYTES;
+
+ lseek64(fd, offset, 0);
+ return 0;
+}
+
+static int write_bitmap0(struct supertype *st, int fd, enum bitmap_update update)
+{
+ unsigned long long dsize;
+ unsigned long long offset;
+ mdp_super_t *sb = st->sb;
+
+ int rv = 0;
+
+ int towrite, n;
+ void *buf;
+
+ if (!get_dev_size(fd, NULL, &dsize))
+ return 1;
+
+ if (dsize < MD_RESERVED_SECTORS*512)
+ return -1;
+
+ offset = MD_NEW_SIZE_SECTORS(dsize>>9);
+
+ offset *= 512;
+
+ if (lseek64(fd, offset + 4096, 0)< 0LL)
+ return 3;
+
+ if (posix_memalign(&buf, 4096, 4096))
+ return -ENOMEM;
+
+ memset(buf, 0xff, 4096);
+ memcpy(buf, ((char*)sb)+MD_SB_BYTES, sizeof(bitmap_super_t));
+ towrite = 60*1024;
+ while (towrite > 0) {
+ n = towrite;
+ if (n > 4096)
+ n = 4096;
+ n = write(fd, buf, n);
+ if (n > 0)
+ towrite -= n;
+ else
+ break;
+ memset(buf, 0xff, 4096);
+ }
+ fsync(fd);
+ if (towrite)
+ rv = -2;
+
+ free(buf);
+ return rv;
+}
+
+static void free_super0(struct supertype *st)
+{
+ if (st->sb)
+ free(st->sb);
+ while (st->info) {
+ struct devinfo *di = st->info;
+ st->info = di->next;
+ if (di->fd >= 0)
+ close(di->fd);
+ free(di);
+ }
+ st->sb = NULL;
+}
+
+static int validate_geometry0(struct supertype *st, int level,
+ int layout, int raiddisks,
+ int *chunk, unsigned long long size,
+ unsigned long long data_offset,
+ char *subdev, unsigned long long *freesize,
+ int consistency_policy, int verbose)
+{
+ unsigned long long ldsize;
+ int fd;
+ unsigned int tbmax = 4;
+
+ /* prior to linux 3.1, a but limits usable device size to 2TB.
+ * It was introduced in 2.6.29, but we won't worry about that detail
+ */
+ if (get_linux_version() < 3001000)
+ tbmax = 2;
+
+ if (level == LEVEL_CONTAINER) {
+ if (verbose)
+ pr_err("0.90 metadata does not support containers\n");
+ return 0;
+ }
+ if (raiddisks > MD_SB_DISKS) {
+ if (verbose)
+ pr_err("0.90 metadata supports at most %d devices per array\n",
+ MD_SB_DISKS);
+ return 0;
+ }
+ if (size >= tbmax * 2ULL*1024*1024*1024) {
+ if (verbose)
+ pr_err("0.90 metadata supports at most %d terabytes per device\n", tbmax);
+ return 0;
+ }
+ if (*chunk == UnSet)
+ *chunk = DEFAULT_CHUNK;
+
+ if (level == 0 && layout != UnSet) {
+ if (verbose)
+ pr_err("0.90 metadata does not support layouts for RAID0\n");
+ return 0;
+ }
+
+ if (!subdev)
+ return 1;
+
+ fd = open(subdev, O_RDONLY|O_EXCL, 0);
+ if (fd < 0) {
+ if (verbose)
+ pr_err("super0.90 cannot open %s: %s\n",
+ subdev, strerror(errno));
+ return 0;
+ }
+
+ if (!get_dev_size(fd, subdev, &ldsize)) {
+ close(fd);
+ return 0;
+ }
+ close(fd);
+
+ if (ldsize < MD_RESERVED_SECTORS * 512)
+ return 0;
+ *freesize = MD_NEW_SIZE_SECTORS(ldsize >> 9);
+ return 1;
+}
+
+struct superswitch super0 = {
+ .examine_super = examine_super0,
+ .brief_examine_super = brief_examine_super0,
+ .export_examine_super = export_examine_super0,
+ .detail_super = detail_super0,
+ .brief_detail_super = brief_detail_super0,
+ .write_init_super = write_init_super0,
+ .validate_geometry = validate_geometry0,
+ .add_to_super = add_to_super0,
+ .copy_metadata = copy_metadata0,
+ .match_home = match_home0,
+ .uuid_from_super = uuid_from_super0,
+ .getinfo_super = getinfo_super0,
+ .container_content = container_content0,
+ .update_super = update_super0,
+ .init_super = init_super0,
+ .store_super = store_super0,
+ .compare_super = compare_super0,
+ .load_super = load_super0,
+ .match_metadata_desc = match_metadata_desc0,
+ .avail_size = avail_size0,
+ .add_internal_bitmap = add_internal_bitmap0,
+ .locate_bitmap = locate_bitmap0,
+ .write_bitmap = write_bitmap0,
+ .free_super = free_super0,
+ .name = "0.90",
+};