diff options
Diffstat (limited to 'super0.c')
| -rw-r--r-- | super0.c | 1350 |
1 files changed, 1350 insertions, 0 deletions
diff --git a/super0.c b/super0.c new file mode 100644 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", +}; 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