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* mdadm - manage Linux "md" devices aka RAID arrays.
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* Copyright (C) 2001-2004 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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* The version-1 superblock :
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* All numeric fields are little-endian.
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* total size: 256 bytes plus 2 per device.
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* 1K allows 384 devices.
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struct mdp_superblock_1 {
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/* constant array information - 128 bytes */
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__u32 magic; /* MD_SB_MAGIC: 0xa92b4efc - little endian */
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__u32 major_version; /* 1 */
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__u32 feature_map; /* 0 for now */
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__u32 pad0; /* always set to 0 when writing */
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__u8 set_uuid[16]; /* user-space generated. */
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char set_name[32]; /* set and interpreted by user-space */
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__u64 ctime; /* lo 40 bits are seconds, top 24 are microseconds or 0*/
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__u32 level; /* -4 (multipath), -1 (linear), 0,1,4,5 */
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__u32 layout; /* only for raid5 currently */
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__u64 size; /* used size of component devices, in 512byte sectors */
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__u32 chunksize; /* in 512byte sectors */
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__u32 bitmap_offset; /* sectors after start of superblock that bitmap starts
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* NOTE: signed, so bitmap can be before superblock
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* only meaningful of feature_map[0] is set.
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/* These are only valid with feature bit '4' */
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__u32 new_level; /* new level we are reshaping to */
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__u64 reshape_position; /* next address in array-space for reshape */
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__u32 delta_disks; /* change in number of raid_disks */
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__u32 new_layout; /* new layout */
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__u32 new_chunk; /* new chunk size (bytes) */
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__u8 pad1[128-124]; /* set to 0 when written */
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/* constant this-device information - 64 bytes */
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__u64 data_offset; /* sector start of data, often 0 */
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__u64 data_size; /* sectors in this device that can be used for data */
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__u64 super_offset; /* sector start of this superblock */
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__u64 recovery_offset;/* sectors before this offset (from data_offset) have been recovered */
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__u32 dev_number; /* permanent identifier of this device - not role in raid */
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__u32 cnt_corrected_read; /* number of read errors that were corrected by re-writing */
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__u8 device_uuid[16]; /* user-space setable, ignored by kernel */
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__u8 devflags; /* per-device flags. Only one defined...*/
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#define WriteMostly1 1 /* mask for writemostly flag in above */
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__u8 pad2[64-57]; /* set to 0 when writing */
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/* array state information - 64 bytes */
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__u64 utime; /* 40 bits second, 24 btes microseconds */
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__u64 events; /* incremented when superblock updated */
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__u64 resync_offset; /* data before this offset (from data_offset) known to be in sync */
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__u32 sb_csum; /* checksum upto devs[max_dev] */
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__u32 max_dev; /* size of devs[] array to consider */
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__u8 pad3[64-32]; /* set to 0 when writing */
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/* device state information. Indexed by dev_number.
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* Note there are no per-device state flags. State information is rolled
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* into the 'roles' value. If a device is spare or faulty, then it doesn't
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* have a meaningful role.
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__u16 dev_roles[0]; /* role in array, or 0xffff for a spare, or 0xfffe for faulty */
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/* feature_map bits */
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#define MD_FEATURE_BITMAP_OFFSET 1
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#define MD_FEATURE_RECOVERY_OFFSET 2 /* recovery_offset is present and
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#define MD_FEATURE_RESHAPE_ACTIVE 4
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#define MD_FEATURE_ALL (1|2|4)
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#define offsetof(t,f) ((int)&(((t*)0)->f))
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static unsigned int calc_sb_1_csum(struct mdp_superblock_1 * sb)
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unsigned int disk_csum, csum;
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unsigned long long newcsum;
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int size = sizeof(*sb) + __le32_to_cpu(sb->max_dev)*2;
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unsigned int *isuper = (unsigned int*)sb;
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/* make sure I can count... */
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if (offsetof(struct mdp_superblock_1,data_offset) != 128 ||
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offsetof(struct mdp_superblock_1, utime) != 192 ||
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sizeof(struct mdp_superblock_1) != 256) {
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fprintf(stderr, "WARNING - superblock isn't sized correctly\n");
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disk_csum = sb->sb_csum;
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for (i=0; size>=4; size -= 4 )
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newcsum += __le32_to_cpu(*isuper++);
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newcsum += __le16_to_cpu(*(unsigned short*) isuper);
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csum = (newcsum & 0xffffffff) + (newcsum >> 32);
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sb->sb_csum = disk_csum;
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static void examine_super1(void *sbv)
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struct mdp_superblock_1 *sb = sbv;
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printf(" Magic : %08x\n", __le32_to_cpu(sb->magic));
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printf(" Version : %02d\n", 1);
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printf(" Feature Map : 0x%x\n", __le32_to_cpu(sb->feature_map));
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printf(" Array UUID : ");
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for (i=0; i<16; i++) {
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if ((i&3)==0 && i != 0) printf(":");
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printf("%02x", sb->set_uuid[i]);
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printf(" Name : %.32s\n", sb->set_name);
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atime = __le64_to_cpu(sb->ctime) & 0xFFFFFFFFFFULL;
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printf(" Creation Time : %.24s\n", ctime(&atime));
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c=map_num(pers, __le32_to_cpu(sb->level));
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printf(" Raid Level : %s\n", c?c:"-unknown-");
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printf(" Raid Devices : %d\n", __le32_to_cpu(sb->raid_disks));
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printf(" Device Size : %llu%s\n", (unsigned long long)sb->data_size, human_size(sb->data_size<<9));
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if (__le32_to_cpu(sb->level) >= 0) {
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switch(__le32_to_cpu(sb->level)) {
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case 1: ddsks=1;break;
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case 5: ddsks = sb->raid_disks-1; break;
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case 6: ddsks = sb->raid_disks-2; break;
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case 10: ddsks = sb->raid_disks / (sb->layout&255) / ((sb->layout>>8)&255);
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printf(" Array Size : %llu%s\n", ddsks*(unsigned long long)sb->size, human_size(ddsks*sb->size<<9));
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if (sb->size != sb->data_size)
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printf(" Used Size : %llu%s\n", (unsigned long long)sb->size, human_size(sb->size<<9));
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printf(" Data Offset : %llu sectors\n", (unsigned long long)__le64_to_cpu(sb->data_offset));
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if (sb->super_offset)
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printf(" Super Offset : %llu sectors\n", (unsigned long long)__le64_to_cpu(sb->super_offset));
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if (__le32_to_cpu(sb->feature_map) & MD_FEATURE_RECOVERY_OFFSET)
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printf("Recovery Offset : %llu sectors\n", (unsigned long long)__le64_to_cpu(sb->recovery_offset));
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printf(" State : %s\n", (__le64_to_cpu(sb->resync_offset)+1)? "active":"clean");
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printf(" Device UUID : ");
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for (i=0; i<16; i++) {
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if ((i&3)==0 && i != 0) printf(":");
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printf("%02x", sb->device_uuid[i]);
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if (sb->feature_map & __cpu_to_le32(MD_FEATURE_BITMAP_OFFSET)) {
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printf("Internal Bitmap : %ld sectors from superblock\n",
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(long)__le32_to_cpu(sb->bitmap_offset));
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if (sb->feature_map & __le32_to_cpu(MD_FEATURE_RESHAPE_ACTIVE)) {
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printf(" Reshape pos'n : %llu%s\n", (unsigned long long)__le64_to_cpu(sb->reshape_position)/2,
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human_size(__le64_to_cpu(sb->reshape_position)<<9));
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if (__le32_to_cpu(sb->delta_disks)) {
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printf(" Delta Devices : %d", __le32_to_cpu(sb->delta_disks));
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if (__le32_to_cpu(sb->delta_disks))
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printf(" (%d->%d)\n",
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__le32_to_cpu(sb->raid_disks)-__le32_to_cpu(sb->delta_disks),
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__le32_to_cpu(sb->raid_disks));
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printf(" (%d->%d)\n", __le32_to_cpu(sb->raid_disks),
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__le32_to_cpu(sb->raid_disks)+__le32_to_cpu(sb->delta_disks));
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if (__le32_to_cpu(sb->new_level) != __le32_to_cpu(sb->level)) {
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c = map_num(pers, __le32_to_cpu(sb->new_level));
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printf(" New Level : %s\n", c?c:"-unknown-");
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if (__le32_to_cpu(sb->new_layout) != __le32_to_cpu(sb->layout)) {
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if (__le32_to_cpu(sb->level) == 5) {
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c = map_num(r5layout, __le32_to_cpu(sb->new_layout));
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printf(" New Layout : %s\n", c?c:"-unknown-");
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if (__le32_to_cpu(sb->level) == 10) {
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printf(" New Layout : near=%d, far=%d\n",
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__le32_to_cpu(sb->new_layout)&255,
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(__le32_to_cpu(sb->new_layout)>>8)&255);
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if (__le32_to_cpu(sb->new_chunk) != __le32_to_cpu(sb->chunksize))
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printf(" New Chunksize : %dK\n", __le32_to_cpu(sb->new_chunk)/2);
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if (sb->devflags & WriteMostly1)
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printf(" write-mostly");
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atime = __le64_to_cpu(sb->utime) & 0xFFFFFFFFFFULL;
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printf(" Update Time : %.24s\n", ctime(&atime));
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if (calc_sb_1_csum(sb) == sb->sb_csum)
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printf(" Checksum : %x - correct\n", __le32_to_cpu(sb->sb_csum));
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printf(" Checksum : %x - expected %x\n", __le32_to_cpu(sb->sb_csum),
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__le32_to_cpu(calc_sb_1_csum(sb)));
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printf(" Events : %llu\n", (unsigned long long)__le64_to_cpu(sb->events));
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if (__le32_to_cpu(sb->level) == 5) {
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c = map_num(r5layout, __le32_to_cpu(sb->layout));
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printf(" Layout : %s\n", c?c:"-unknown-");
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if (__le32_to_cpu(sb->level) == 10) {
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int lo = __le32_to_cpu(sb->layout);
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printf(" Layout : near=%d, far=%d\n",
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lo&255, (lo>>8)&255);
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switch(__le32_to_cpu(sb->level)) {
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printf(" Chunk Size : %dK\n", __le32_to_cpu(sb->chunksize)/2);
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printf(" Rounding : %dK\n", __le32_to_cpu(sb->chunksize)/2);
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printf(" Array State : ");
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for (d=0; d<__le32_to_cpu(sb->raid_disks); d++) {
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for (i=0; i< __le32_to_cpu(sb->max_dev); i++) {
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int role = __le16_to_cpu(sb->dev_roles[i]);
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if (i == __le32_to_cpu(sb->dev_number))
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if (cnt > 1) printf("?");
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else if (cnt == 1 && me) printf("U");
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else if (cnt == 1) printf("u");
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for (i=0; i< __le32_to_cpu(sb->max_dev); i++) {
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int role = __le16_to_cpu(sb->dev_roles[i]);
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if (faulty) printf(" %d failed", faulty);
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static void brief_examine_super1(void *sbv)
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struct mdp_superblock_1 *sb = sbv;
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char *c=map_num(pers, __le32_to_cpu(sb->level));
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printf("ARRAY /dev/?? level=%s metadata=1 num-devices=%d UUID=",
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c?c:"-unknown-", sb->raid_disks);
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for (i=0; i<16; i++) {
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printf("%02x", sb->set_uuid[i]);
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if ((i&3)==0 && i != 0) printf(":");
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printf(" name=%.32s", sb->set_name);
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static void detail_super1(void *sbv)
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struct mdp_superblock_1 *sb = sbv;
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printf(" Name : %.32s\n", sb->set_name);
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for (i=0; i<16; i++) {
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if ((i&3)==0 && i != 0) printf(":");
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printf("%02x", sb->set_uuid[i]);
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printf("\n Events : %llu\n\n", (unsigned long long)__le64_to_cpu(sb->events));
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static void brief_detail_super1(void *sbv)
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struct mdp_superblock_1 *sb = sbv;
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printf(" name=%.32s", sb->set_name);
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for (i=0; i<16; i++) {
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if ((i&3)==0 && i != 0) printf(":");
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printf("%02x", sb->set_uuid[i]);
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static void uuid_from_super1(int uuid[4], void * sbv)
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struct mdp_superblock_1 *super = sbv;
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char *cuuid = (char*)uuid;
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cuuid[i] = super->set_uuid[i];
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static void getinfo_super1(struct mdinfo *info, void *sbv)
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struct mdp_superblock_1 *sb = sbv;
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info->array.major_version = 1;
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info->array.minor_version = __le32_to_cpu(sb->feature_map);
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info->array.patch_version = 0;
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info->array.raid_disks = __le32_to_cpu(sb->raid_disks);
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info->array.level = __le32_to_cpu(sb->level);
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info->array.layout = __le32_to_cpu(sb->layout);
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info->array.md_minor = -1;
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info->array.ctime = __le64_to_cpu(sb->ctime);
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info->array.utime = __le64_to_cpu(sb->utime);
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info->array.chunk_size = __le32_to_cpu(sb->chunksize)*512;
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info->data_offset = __le64_to_cpu(sb->data_offset);
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info->component_size = __le64_to_cpu(sb->size);
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info->disk.major = 0;
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info->disk.minor = 0;
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info->disk.number = __le32_to_cpu(sb->dev_number);
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if (__le32_to_cpu(sb->dev_number) >= __le32_to_cpu(sb->max_dev) ||
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__le32_to_cpu(sb->max_dev) > 512)
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role = __le16_to_cpu(sb->dev_roles[__le32_to_cpu(sb->dev_number)]);
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info->disk.raid_disk = -1;
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info->disk.state = 2; /* spare: ACTIVE, not sync, not faulty */
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info->disk.state = 1; /* faulty */
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info->disk.state = 6; /* active and in sync */
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info->disk.raid_disk = role;
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info->events = __le64_to_cpu(sb->events);
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memcpy(info->uuid, sb->set_uuid, 16);
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strncpy(info->name, sb->set_name, 32);
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if (sb->feature_map & __le32_to_cpu(MD_FEATURE_RESHAPE_ACTIVE)) {
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info->reshape_active = 1;
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info->reshape_progress = __le64_to_cpu(sb->reshape_position);
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info->new_level = __le32_to_cpu(sb->new_level);
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info->delta_disks = __le32_to_cpu(sb->delta_disks);
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info->new_layout = __le32_to_cpu(sb->new_layout);
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info->new_chunk = __le32_to_cpu(sb->new_chunk)<<9;
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info->reshape_active = 0;
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for (i=0; i< __le32_to_cpu(sb->max_dev); i++) {
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role = __le16_to_cpu(sb->dev_roles[i]);
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if (/*role == 0xFFFF || */role < info->array.raid_disks)
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info->array.working_disks = working;
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static int update_super1(struct mdinfo *info, void *sbv, char *update, char *devname, int verbose)
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struct mdp_superblock_1 *sb = sbv;
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if (strcmp(update, "force")==0) {
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sb->events = __cpu_to_le64(info->events);
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switch(__le32_to_cpu(sb->level)) {
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case 5: case 4: case 6:
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/* need to force clean */
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sb->resync_offset = ~0ULL;
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if (strcmp(update, "assemble")==0) {
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int d = info->disk.number;
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if (info->disk.state == 6)
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want = __cpu_to_le32(info->disk.raid_disk);
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if (sb->dev_roles[d] != want) {
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sb->dev_roles[d] = want;
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if (strcmp(update, "newdev") == 0) {
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int d = info->disk.number;
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memset(&sb->disks[d], 0, sizeof(sb->disks[d]));
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sb->disks[d].number = d;
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sb->disks[d].major = info->disk.major;
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sb->disks[d].minor = info->disk.minor;
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sb->disks[d].raid_disk = info->disk.raid_disk;
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sb->disks[d].state = info->disk.state;
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sb->this_disk = sb->disks[d];
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if (strcmp(update, "grow") == 0) {
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sb->raid_disks = __cpu_to_le32(info->array.raid_disks);
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if (strcmp(update, "resync") == 0) {
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/* make sure resync happens */
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sb->resync_offset = ~0ULL;
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if (strcmp(update, "uuid") == 0)
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memcpy(sb->set_uuid, info->uuid, 16);
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if (strcmp(update, "_reshape_progress")==0)
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sb->reshape_position = __cpu_to_le64(info->reshape_progress);
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sb->sb_csum = calc_sb_1_csum(sb);
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static __u64 event_super1(void *sbv)
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struct mdp_superblock_1 *sb = sbv;
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return __le64_to_cpu(sb->events);
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static int init_super1(struct supertype *st, void **sbp, mdu_array_info_t *info, unsigned long long size, char *name)
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struct mdp_superblock_1 *sb = malloc(1024 + sizeof(bitmap_super_t));
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if (info->major_version == -1)
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/* zeroing superblock */
496
spares = info->working_disks - info->active_disks;
497
if (info->raid_disks + spares > 384) {
498
fprintf(stderr, Name ": too many devices requested: %d+%d > %d\n",
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info->raid_disks , spares, 384);
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sb->magic = __cpu_to_le32(MD_SB_MAGIC);
505
sb->major_version = __cpu_to_le32(1);
509
if ((rfd = open("/dev/urandom", O_RDONLY)) < 0 ||
510
read(rfd, sb->set_uuid, 16) != 16) {
511
*(__u32*)(sb->set_uuid) = random();
512
*(__u32*)(sb->set_uuid+4) = random();
513
*(__u32*)(sb->set_uuid+8) = random();
514
*(__u32*)(sb->set_uuid+12) = random();
516
if (rfd >= 0) close(rfd);
518
memset(sb->set_name, 0, 32);
519
strcpy(sb->set_name, name);
521
sb->ctime = __cpu_to_le64((unsigned long long)time(0));
522
sb->level = __cpu_to_le32(info->level);
523
sb->layout = __cpu_to_le32(info->layout);
524
sb->size = __cpu_to_le64(size*2ULL);
525
sb->chunksize = __cpu_to_le32(info->chunk_size>>9);
526
sb->raid_disks = __cpu_to_le32(info->raid_disks);
528
sb->data_offset = __cpu_to_le64(0);
529
sb->data_size = __cpu_to_le64(0);
530
sb->super_offset = __cpu_to_le64(0);
531
sb->recovery_offset = __cpu_to_le64(0);
533
sb->utime = sb->ctime;
534
sb->events = __cpu_to_le64(1);
535
if (info->state & (1<<MD_SB_CLEAN))
536
sb->resync_offset = ~0ULL;
538
sb->resync_offset = 0;
539
sb->max_dev = __cpu_to_le32((1024- sizeof(struct mdp_superblock_1))/
540
sizeof(sb->dev_roles[0]));
541
memset(sb->pad3, 0, sizeof(sb->pad3));
543
memset(sb->dev_roles, 0xff, 1024 - sizeof(struct mdp_superblock_1));
549
/* Add a device to the superblock being created */
550
static void add_to_super1(void *sbv, mdu_disk_info_t *dk)
552
struct mdp_superblock_1 *sb = sbv;
553
__u16 *rp = sb->dev_roles + dk->number;
554
if ((dk->state & 6) == 6) /* active, sync */
555
*rp = __cpu_to_le16(dk->raid_disk);
556
else if ((dk->state & ~2) == 0) /* active or idle -> spare */
562
static int store_super1(struct supertype *st, int fd, void *sbv)
564
struct mdp_superblock_1 *sb = sbv;
565
unsigned long long sb_offset;
568
unsigned long long dsize;
571
if (ioctl(fd, BLKGETSIZE64, &dsize) != 0)
574
if (ioctl(fd, BLKGETSIZE, &size))
577
dsize = (unsigned long long)size;
585
* Calculate the position of the superblock.
586
* It is always aligned to a 4K boundary and
587
* depending on minor_version, it can be:
588
* 0: At least 8K, but less than 12K, from end of device
589
* 1: At start of device
590
* 2: 4K from start of device.
592
switch(st->minor_version) {
596
sb_offset &= ~(4*2-1);
610
if (sb_offset != __le64_to_cpu(sb->super_offset) &&
611
0 != __le64_to_cpu(sb->super_offset)
613
fprintf(stderr, Name ": internal error - sb_offset is wrong\n");
617
if (lseek64(fd, sb_offset << 9, 0)< 0LL)
620
sbsize = sizeof(*sb) + 2 * __le32_to_cpu(sb->max_dev);
622
if (write(fd, sb, sbsize) != sbsize)
629
static int load_super1(struct supertype *st, int fd, void **sbp, char *devname);
631
static int write_init_super1(struct supertype *st, void *sbv,
632
mdu_disk_info_t *dinfo, char *devname)
634
struct mdp_superblock_1 *sb = sbv;
636
int fd = open(devname, O_RDWR | O_EXCL);
640
unsigned long size, space;
641
unsigned long long dsize, array_size;
646
fprintf(stderr, Name ": Failed to open %s to write superblock\n",
651
sb->dev_number = __cpu_to_le32(dinfo->number);
652
if (dinfo->state & (1<<MD_DISK_WRITEMOSTLY))
653
sb->devflags |= WriteMostly1;
655
if ((rfd = open("/dev/urandom", O_RDONLY)) < 0 ||
656
read(rfd, sb->device_uuid, 16) != 16) {
657
*(__u32*)(sb->device_uuid) = random();
658
*(__u32*)(sb->device_uuid+4) = random();
659
*(__u32*)(sb->device_uuid+8) = random();
660
*(__u32*)(sb->device_uuid+12) = random();
662
if (rfd >= 0) close(rfd);
665
if (load_super1(st, fd, &refsbv, NULL)==0) {
666
struct mdp_superblock_1 *refsb = refsbv;
668
memcpy(sb->device_uuid, refsb->device_uuid, 16);
669
if (memcmp(sb->set_uuid, refsb->set_uuid, 16)==0) {
670
/* same array, so preserve events and dev_number */
671
sb->events = refsb->events;
672
sb->dev_number = refsb->dev_number;
678
if (ioctl(fd, BLKGETSIZE64, &dsize) != 0)
681
if (ioctl(fd, BLKGETSIZE, &size))
695
* Calculate the position of the superblock.
696
* It is always aligned to a 4K boundary and
697
* depending on minor_version, it can be:
698
* 0: At least 8K, but less than 12K, from end of device
699
* 1: At start of device
700
* 2: 4K from start of device.
701
* Depending on the array size, we might leave extra space
704
array_size = __le64_to_cpu(sb->size);
705
switch(st->minor_version) {
709
sb_offset &= ~(4*2-1);
710
sb->super_offset = __cpu_to_le64(sb_offset);
711
sb->data_offset = __cpu_to_le64(0);
712
if (sb_offset-64*2 >= array_size && array_size > 8*1024*1024*2)
713
sb->data_size = __cpu_to_le64(sb_offset-64*2);
715
sb->data_size = __cpu_to_le64(sb_offset);
718
sb->super_offset = __cpu_to_le64(0);
719
if (dsize - 64*2 >= array_size && array_size > 8*1024*1024*2)
723
sb->data_offset = __cpu_to_le64(space); /* leave space for super and bitmap */
724
sb->data_size = __cpu_to_le64(dsize - space);
728
if (dsize - 4*2 - 64*2 >= array_size && array_size > 8*1024*1024*2)
732
sb->super_offset = __cpu_to_le64(sb_offset);
733
sb->data_offset = __cpu_to_le64(sb_offset+space);
734
sb->data_size = __cpu_to_le64(dsize - 4*2 - space);
741
sb->sb_csum = calc_sb_1_csum(sb);
742
rv = store_super1(st, fd, sb);
744
fprintf(stderr, Name ": failed to write superblock to %s\n", devname);
746
if (rv == 0 && (__le32_to_cpu(sb->feature_map) & 1))
747
rv = st->ss->write_bitmap(st, fd, sbv);
752
static int compare_super1(void **firstp, void *secondv)
756
* 0 same, or first was empty, and second was copied
757
* 1 second had wrong number
761
struct mdp_superblock_1 *first = *firstp;
762
struct mdp_superblock_1 *second = secondv;
764
if (second->magic != __cpu_to_le32(MD_SB_MAGIC))
766
if (second->major_version != __cpu_to_le32(1))
770
first = malloc(1024);
771
memcpy(first, second, 1024);
775
if (memcmp(first->set_uuid, second->set_uuid, 16)!= 0)
778
if (first->ctime != second->ctime ||
779
first->level != second->level ||
780
first->layout != second->layout ||
781
first->size != second->size ||
782
first->chunksize != second->chunksize ||
783
first->raid_disks != second->raid_disks)
788
static int load_super1(struct supertype *st, int fd, void **sbp, char *devname)
791
unsigned long long dsize;
792
unsigned long long sb_offset;
793
struct mdp_superblock_1 *super;
797
if (st->ss == NULL) {
800
/* guess... choose latest ctime */
802
for (st->minor_version = 0; st->minor_version <= 2 ; st->minor_version++) {
803
switch(load_super1(st, fd, sbp, devname)) {
804
case 0: super = *sbp;
805
if (bestvers == -1 ||
806
bestctime < __le64_to_cpu(super->ctime)) {
807
bestvers = st->minor_version;
808
bestctime = __le64_to_cpu(super->ctime);
813
case 1: st->ss = NULL; return 1; /*bad device */
814
case 2: break; /* bad, try next */
817
if (bestvers != -1) {
819
st->minor_version = bestvers;
822
rv = load_super1(st, fd, sbp, devname);
823
if (rv) st->ss = NULL;
830
if (ioctl(fd, BLKGETSIZE64, &dsize) != 0)
833
if (ioctl(fd, BLKGETSIZE, &size)) {
835
fprintf(stderr, Name ": cannot find device size for %s: %s\n",
836
devname, strerror(errno));
845
fprintf(stderr, Name ": %s is too small for md: size is %llu sectors.\n",
851
* Calculate the position of the superblock.
852
* It is always aligned to a 4K boundary and
853
* depeding on minor_version, it can be:
854
* 0: At least 8K, but less than 12K, from end of device
855
* 1: At start of device
856
* 2: 4K from start of device.
858
switch(st->minor_version) {
862
sb_offset &= ~(4*2-1);
874
ioctl(fd, BLKFLSBUF, 0); /* make sure we read current data */
877
if (lseek64(fd, sb_offset << 9, 0)< 0LL) {
879
fprintf(stderr, Name ": Cannot seek to superblock on %s: %s\n",
880
devname, strerror(errno));
884
super = malloc(1024 + sizeof(bitmap_super_t));
886
if (read(fd, super, 1024) != 1024) {
888
fprintf(stderr, Name ": Cannot read superblock on %s\n",
894
if (__le32_to_cpu(super->magic) != MD_SB_MAGIC) {
896
fprintf(stderr, Name ": No super block found on %s (Expected magic %08x, got %08x)\n",
897
devname, MD_SB_MAGIC, __le32_to_cpu(super->magic));
902
if (__le32_to_cpu(super->major_version) != 1) {
904
fprintf(stderr, Name ": Cannot interpret superblock on %s - version is %d\n",
905
devname, __le32_to_cpu(super->major_version));
909
if (__le64_to_cpu(super->super_offset) != sb_offset) {
911
fprintf(stderr, Name ": No superblock found on %s (super_offset is wrong)\n",
921
static struct supertype *match_metadata_desc1(char *arg)
923
struct supertype *st = malloc(sizeof(*st));
928
if (strcmp(arg, "1") == 0 ||
929
strcmp(arg, "1.0") == 0 ||
930
strcmp(arg, "default/large") == 0) {
931
st->minor_version = 0;
934
if (strcmp(arg, "1.1") == 0) {
935
st->minor_version = 1;
938
if (strcmp(arg, "1.2") == 0) {
939
st->minor_version = 2;
947
/* find available size on device with this devsize, using
948
* superblock type st, and reserving 'reserve' sectors for
951
static __u64 avail_size1(struct supertype *st, __u64 devsize)
956
/* if the device is bigger than 8Gig, save 64k for bitmap usage,
957
* if biffer than 200Gig, save 128k
959
if (devsize > 200*1024*1024*2)
961
else if (devsize > 8*1024*1024*2)
964
switch(st->minor_version) {
967
return ((devsize - 8*2 ) & ~(4*2-1));
969
/* at start, 4K for superblock and possible bitmap */
970
return devsize - 4*2;
972
/* 4k from start, 4K for superblock and possible bitmap */
973
return devsize - (4+4)*2;
979
add_internal_bitmap1(struct supertype *st, void *sbv,
980
int chunk, int delay, int write_behind, unsigned long long size,
981
int may_change, int major)
984
* If not may_change, then this is a 'Grow', and the bitmap
985
* must fit after the superblock.
986
* If may_change, then this is create, and we can put the bitmap
987
* before the superblock if we like, or may move the start.
988
* For now, just squeeze the bitmap into 3k and don't change anything.
990
* size is in sectors, chunk is in bytes !!!
993
unsigned long long bits;
994
unsigned long long max_bits = (3*512 - sizeof(bitmap_super_t)) * 8;
995
unsigned long long min_chunk;
996
struct mdp_superblock_1 *sb = sbv;
997
bitmap_super_t *bms = (bitmap_super_t*)(((char*)sb) + 1024);
999
if (st->minor_version && !may_change &&
1000
__le64_to_cpu(sb->data_offset) - __le64_to_cpu(sb->super_offset) < 8)
1001
return 0; /* doesn't fit */
1005
min_chunk = 4096; /* sub-page chunks don't work yet.. */
1006
bits = (size*512)/min_chunk +1;
1007
while (bits > max_bits) {
1013
else if (chunk < min_chunk)
1014
return 0; /* chunk size too small */
1015
if (chunk == 0) /* rounding problem */
1018
sb->bitmap_offset = __cpu_to_le32(2);
1020
sb->feature_map = __cpu_to_le32(__le32_to_cpu(sb->feature_map) | 1);
1021
memset(bms, 0, sizeof(*bms));
1022
bms->magic = __cpu_to_le32(BITMAP_MAGIC);
1023
bms->version = __cpu_to_le32(major);
1024
uuid_from_super1((int*)bms->uuid, sb);
1025
bms->chunksize = __cpu_to_le32(chunk);
1026
bms->daemon_sleep = __cpu_to_le32(delay);
1027
bms->sync_size = __cpu_to_le64(size);
1028
bms->write_behind = __cpu_to_le32(write_behind);
1034
void locate_bitmap1(struct supertype *st, int fd, void *sbv)
1036
unsigned long long offset;
1037
struct mdp_superblock_1 *sb;
1041
if (st->ss->load_super(st, fd, &sbv, NULL))
1042
return; /* no error I hope... */
1047
offset = __le64_to_cpu(sb->super_offset);
1048
offset += (long) __le32_to_cpu(sb->bitmap_offset);
1051
lseek64(fd, offset<<9, 0);
1054
int write_bitmap1(struct supertype *st, int fd, void *sbv)
1056
struct mdp_superblock_1 *sb = sbv;
1057
bitmap_super_t *bms = (bitmap_super_t*)(((char*)sb)+1024);
1063
locate_bitmap1(st, fd, sbv);
1065
if (write(fd, ((char*)sb)+1024, sizeof(bitmap_super_t)) !=
1066
sizeof(bitmap_super_t))
1068
towrite = __le64_to_cpu(bms->sync_size) / (__le32_to_cpu(bms->chunksize)>>9);
1069
towrite = (towrite+7) >> 3; /* bits to bytes */
1070
memset(buf, 0xff, sizeof(buf));
1071
while (towrite > 0) {
1073
if (n > sizeof(buf))
1075
n = write(fd, buf, n);
1088
struct superswitch super1 = {
1090
.examine_super = examine_super1,
1091
.brief_examine_super = brief_examine_super1,
1092
.detail_super = detail_super1,
1093
.brief_detail_super = brief_detail_super1,
1095
.uuid_from_super = uuid_from_super1,
1096
.getinfo_super = getinfo_super1,
1097
.update_super = update_super1,
1098
.event_super = event_super1,
1099
.init_super = init_super1,
1100
.add_to_super = add_to_super1,
1101
.store_super = store_super1,
1102
.write_init_super = write_init_super1,
1103
.compare_super = compare_super1,
1104
.load_super = load_super1,
1105
.match_metadata_desc = match_metadata_desc1,
1106
.avail_size = avail_size1,
1107
.add_internal_bitmap = add_internal_bitmap1,
1108
.locate_bitmap = locate_bitmap1,
1109
.write_bitmap = write_bitmap1,
1111
#if __BYTE_ORDER == BIG_ENDIAN