2 * Copyright (C) 2008 Oracle. All rights reserved.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
19 #define _XOPEN_SOURCE 500
24 #include <sys/types.h>
30 #include "kerncompat.h"
34 #include "transaction.h"
38 #include "extent_io.h"
40 #define HEADER_MAGIC 0xbd5c25e27295668bULL
41 #define MAX_PENDING_SIZE (256 * 1024)
42 #define BLOCK_SIZE 1024
43 #define BLOCK_MASK (BLOCK_SIZE - 1)
45 #define COMPRESS_NONE 0
46 #define COMPRESS_ZLIB 1
48 struct meta_cluster_item {
51 } __attribute__ ((__packed__));
53 struct meta_cluster_header {
58 } __attribute__ ((__packed__));
60 /* cluster header + index items + buffers */
62 struct meta_cluster_header header;
63 struct meta_cluster_item items[];
64 } __attribute__ ((__packed__));
66 #define ITEMS_PER_CLUSTER ((BLOCK_SIZE - sizeof(struct meta_cluster)) / \
67 sizeof(struct meta_cluster_item))
77 struct list_head list;
78 struct list_head ordered;
86 struct metadump_struct {
87 struct btrfs_root *root;
90 struct meta_cluster *cluster;
94 pthread_mutex_t mutex;
96 struct rb_root name_tree;
98 struct list_head list;
99 struct list_head ordered;
119 struct mdrestore_struct {
125 pthread_mutex_t mutex;
128 struct rb_root chunk_tree;
129 struct list_head list;
133 u8 uuid[BTRFS_UUID_SIZE];
134 u8 fsid[BTRFS_FSID_SIZE];
142 struct btrfs_fs_info *info;
145 static void print_usage(void) __attribute__((noreturn));
146 static int search_for_chunk_blocks(struct mdrestore_struct *mdres,
147 u64 search, u64 cluster_bytenr);
148 static struct extent_buffer *alloc_dummy_eb(u64 bytenr, u32 size);
150 static void csum_block(u8 *buf, size_t len)
152 char result[BTRFS_CRC32_SIZE];
154 crc = crc32c(crc, buf + BTRFS_CSUM_SIZE, len - BTRFS_CSUM_SIZE);
155 btrfs_csum_final(crc, result);
156 memcpy(buf, result, BTRFS_CRC32_SIZE);
159 static int has_name(struct btrfs_key *key)
162 case BTRFS_DIR_ITEM_KEY:
163 case BTRFS_DIR_INDEX_KEY:
164 case BTRFS_INODE_REF_KEY:
165 case BTRFS_INODE_EXTREF_KEY:
166 case BTRFS_XATTR_ITEM_KEY:
175 static char *generate_garbage(u32 name_len)
177 char *buf = malloc(name_len);
183 for (i = 0; i < name_len; i++) {
184 char c = rand() % 94 + 33;
194 static int name_cmp(struct rb_node *a, struct rb_node *b, int fuzz)
196 struct name *entry = rb_entry(a, struct name, n);
197 struct name *ins = rb_entry(b, struct name, n);
200 len = min(ins->len, entry->len);
201 return memcmp(ins->val, entry->val, len);
204 static int chunk_cmp(struct rb_node *a, struct rb_node *b, int fuzz)
206 struct fs_chunk *entry = rb_entry(a, struct fs_chunk, n);
207 struct fs_chunk *ins = rb_entry(b, struct fs_chunk, n);
209 if (fuzz && ins->logical >= entry->logical &&
210 ins->logical < entry->logical + entry->bytes)
213 if (ins->logical < entry->logical)
215 else if (ins->logical > entry->logical)
220 static void tree_insert(struct rb_root *root, struct rb_node *ins,
221 int (*cmp)(struct rb_node *a, struct rb_node *b,
224 struct rb_node ** p = &root->rb_node;
225 struct rb_node * parent = NULL;
231 dir = cmp(*p, ins, 0);
240 rb_link_node(ins, parent, p);
241 rb_insert_color(ins, root);
244 static struct rb_node *tree_search(struct rb_root *root,
245 struct rb_node *search,
246 int (*cmp)(struct rb_node *a,
247 struct rb_node *b, int fuzz),
250 struct rb_node *n = root->rb_node;
254 dir = cmp(n, search, fuzz);
266 static char *find_collision(struct metadump_struct *md, char *name,
270 struct rb_node *entry;
272 unsigned long checksum;
278 entry = tree_search(&md->name_tree, &tmp.n, name_cmp, 0);
280 val = rb_entry(entry, struct name, n);
285 val = malloc(sizeof(struct name));
287 fprintf(stderr, "Couldn't sanitize name, enomem\n");
292 memset(val, 0, sizeof(*val));
296 val->sub = malloc(name_len);
298 fprintf(stderr, "Couldn't sanitize name, enomem\n");
304 checksum = crc32c(~1, val->val, name_len);
305 memset(val->sub, ' ', name_len);
308 if (crc32c(~1, val->sub, name_len) == checksum &&
309 memcmp(val->sub, val->val, val->len)) {
314 if (val->sub[i] == 127) {
319 } while (val->sub[i] == 127);
324 if (val->sub[i] == '/')
326 memset(val->sub, ' ', i);
331 if (val->sub[i] == '/')
337 fprintf(stderr, "Couldn't find a collision for '%.*s', "
338 "generating normal garbage, it won't match indexes\n",
340 for (i = 0; i < name_len; i++) {
341 char c = rand() % 94 + 33;
349 tree_insert(&md->name_tree, &val->n, name_cmp);
353 static void sanitize_dir_item(struct metadump_struct *md, struct extent_buffer *eb,
356 struct btrfs_dir_item *dir_item;
359 unsigned long name_ptr;
364 int free_garbage = (md->sanitize_names == 1);
366 dir_item = btrfs_item_ptr(eb, slot, struct btrfs_dir_item);
367 total_len = btrfs_item_size_nr(eb, slot);
368 while (cur < total_len) {
369 this_len = sizeof(*dir_item) +
370 btrfs_dir_name_len(eb, dir_item) +
371 btrfs_dir_data_len(eb, dir_item);
372 name_ptr = (unsigned long)(dir_item + 1);
373 name_len = btrfs_dir_name_len(eb, dir_item);
375 if (md->sanitize_names > 1) {
376 buf = malloc(name_len);
378 fprintf(stderr, "Couldn't sanitize name, "
382 read_extent_buffer(eb, buf, name_ptr, name_len);
383 garbage = find_collision(md, buf, name_len);
385 garbage = generate_garbage(name_len);
388 fprintf(stderr, "Couldn't sanitize name, enomem\n");
391 write_extent_buffer(eb, garbage, name_ptr, name_len);
393 dir_item = (struct btrfs_dir_item *)((char *)dir_item +
400 static void sanitize_inode_ref(struct metadump_struct *md,
401 struct extent_buffer *eb, int slot, int ext)
403 struct btrfs_inode_extref *extref;
404 struct btrfs_inode_ref *ref;
407 unsigned long name_ptr;
411 int free_garbage = (md->sanitize_names == 1);
413 item_size = btrfs_item_size_nr(eb, slot);
414 ptr = btrfs_item_ptr_offset(eb, slot);
415 while (cur_offset < item_size) {
417 extref = (struct btrfs_inode_extref *)(ptr +
419 name_ptr = (unsigned long)(&extref->name);
420 len = btrfs_inode_extref_name_len(eb, extref);
421 cur_offset += sizeof(*extref);
423 ref = (struct btrfs_inode_ref *)(ptr + cur_offset);
424 len = btrfs_inode_ref_name_len(eb, ref);
425 name_ptr = (unsigned long)(ref + 1);
426 cur_offset += sizeof(*ref);
430 if (md->sanitize_names > 1) {
433 fprintf(stderr, "Couldn't sanitize name, "
437 read_extent_buffer(eb, buf, name_ptr, len);
438 garbage = find_collision(md, buf, len);
440 garbage = generate_garbage(len);
444 fprintf(stderr, "Couldn't sanitize name, enomem\n");
447 write_extent_buffer(eb, garbage, name_ptr, len);
453 static void sanitize_xattr(struct metadump_struct *md,
454 struct extent_buffer *eb, int slot)
456 struct btrfs_dir_item *dir_item;
457 unsigned long data_ptr;
460 dir_item = btrfs_item_ptr(eb, slot, struct btrfs_dir_item);
461 data_len = btrfs_dir_data_len(eb, dir_item);
463 data_ptr = (unsigned long)((char *)(dir_item + 1) +
464 btrfs_dir_name_len(eb, dir_item));
465 memset_extent_buffer(eb, 0, data_ptr, data_len);
468 static void sanitize_name(struct metadump_struct *md, u8 *dst,
469 struct extent_buffer *src, struct btrfs_key *key,
472 struct extent_buffer *eb;
474 eb = alloc_dummy_eb(src->start, src->len);
476 fprintf(stderr, "Couldn't sanitize name, no memory\n");
480 memcpy(eb->data, dst, eb->len);
483 case BTRFS_DIR_ITEM_KEY:
484 case BTRFS_DIR_INDEX_KEY:
485 sanitize_dir_item(md, eb, slot);
487 case BTRFS_INODE_REF_KEY:
488 sanitize_inode_ref(md, eb, slot, 0);
490 case BTRFS_INODE_EXTREF_KEY:
491 sanitize_inode_ref(md, eb, slot, 1);
493 case BTRFS_XATTR_ITEM_KEY:
494 sanitize_xattr(md, eb, slot);
500 memcpy(dst, eb->data, eb->len);
505 * zero inline extents and csum items
507 static void zero_items(struct metadump_struct *md, u8 *dst,
508 struct extent_buffer *src)
510 struct btrfs_file_extent_item *fi;
511 struct btrfs_item *item;
512 struct btrfs_key key;
513 u32 nritems = btrfs_header_nritems(src);
518 for (i = 0; i < nritems; i++) {
519 item = btrfs_item_nr(i);
520 btrfs_item_key_to_cpu(src, &key, i);
521 if (key.type == BTRFS_CSUM_ITEM_KEY) {
522 size = btrfs_item_size_nr(src, i);
523 memset(dst + btrfs_leaf_data(src) +
524 btrfs_item_offset_nr(src, i), 0, size);
528 if (md->sanitize_names && has_name(&key)) {
529 sanitize_name(md, dst, src, &key, i);
533 if (key.type != BTRFS_EXTENT_DATA_KEY)
536 fi = btrfs_item_ptr(src, i, struct btrfs_file_extent_item);
537 extent_type = btrfs_file_extent_type(src, fi);
538 if (extent_type != BTRFS_FILE_EXTENT_INLINE)
541 ptr = btrfs_file_extent_inline_start(fi);
542 size = btrfs_file_extent_inline_item_len(src, item);
543 memset(dst + ptr, 0, size);
548 * copy buffer and zero useless data in the buffer
550 static void copy_buffer(struct metadump_struct *md, u8 *dst,
551 struct extent_buffer *src)
557 memcpy(dst, src->data, src->len);
558 if (src->start == BTRFS_SUPER_INFO_OFFSET)
561 level = btrfs_header_level(src);
562 nritems = btrfs_header_nritems(src);
565 size = sizeof(struct btrfs_header);
566 memset(dst + size, 0, src->len - size);
567 } else if (level == 0) {
568 size = btrfs_leaf_data(src) +
569 btrfs_item_offset_nr(src, nritems - 1) -
570 btrfs_item_nr_offset(nritems);
571 memset(dst + btrfs_item_nr_offset(nritems), 0, size);
572 zero_items(md, dst, src);
574 size = offsetof(struct btrfs_node, ptrs) +
575 sizeof(struct btrfs_key_ptr) * nritems;
576 memset(dst + size, 0, src->len - size);
578 csum_block(dst, src->len);
581 static void *dump_worker(void *data)
583 struct metadump_struct *md = (struct metadump_struct *)data;
584 struct async_work *async;
588 pthread_mutex_lock(&md->mutex);
589 while (list_empty(&md->list)) {
591 pthread_mutex_unlock(&md->mutex);
594 pthread_cond_wait(&md->cond, &md->mutex);
596 async = list_entry(md->list.next, struct async_work, list);
597 list_del_init(&async->list);
598 pthread_mutex_unlock(&md->mutex);
600 if (md->compress_level > 0) {
601 u8 *orig = async->buffer;
603 async->bufsize = compressBound(async->size);
604 async->buffer = malloc(async->bufsize);
606 ret = compress2(async->buffer,
607 (unsigned long *)&async->bufsize,
608 orig, async->size, md->compress_level);
616 pthread_mutex_lock(&md->mutex);
618 pthread_mutex_unlock(&md->mutex);
624 static void meta_cluster_init(struct metadump_struct *md, u64 start)
626 struct meta_cluster_header *header;
630 header = &md->cluster->header;
631 header->magic = cpu_to_le64(HEADER_MAGIC);
632 header->bytenr = cpu_to_le64(start);
633 header->nritems = cpu_to_le32(0);
634 header->compress = md->compress_level > 0 ?
635 COMPRESS_ZLIB : COMPRESS_NONE;
638 static void metadump_destroy(struct metadump_struct *md, int num_threads)
643 pthread_mutex_lock(&md->mutex);
645 pthread_cond_broadcast(&md->cond);
646 pthread_mutex_unlock(&md->mutex);
648 for (i = 0; i < num_threads; i++)
649 pthread_join(md->threads[i], NULL);
651 pthread_cond_destroy(&md->cond);
652 pthread_mutex_destroy(&md->mutex);
654 while ((n = rb_first(&md->name_tree))) {
657 name = rb_entry(n, struct name, n);
658 rb_erase(n, &md->name_tree);
667 static int metadump_init(struct metadump_struct *md, struct btrfs_root *root,
668 FILE *out, int num_threads, int compress_level,
673 memset(md, 0, sizeof(*md));
674 pthread_cond_init(&md->cond, NULL);
675 pthread_mutex_init(&md->mutex, NULL);
676 INIT_LIST_HEAD(&md->list);
677 INIT_LIST_HEAD(&md->ordered);
680 md->pending_start = (u64)-1;
681 md->compress_level = compress_level;
682 md->cluster = calloc(1, BLOCK_SIZE);
683 md->sanitize_names = sanitize_names;
684 if (sanitize_names > 1)
685 crc32c_optimization_init();
688 pthread_cond_destroy(&md->cond);
689 pthread_mutex_destroy(&md->mutex);
693 meta_cluster_init(md, 0);
697 md->name_tree.rb_node = NULL;
698 md->num_threads = num_threads;
699 md->threads = calloc(num_threads, sizeof(pthread_t));
702 pthread_cond_destroy(&md->cond);
703 pthread_mutex_destroy(&md->mutex);
707 for (i = 0; i < num_threads; i++) {
708 ret = pthread_create(md->threads + i, NULL, dump_worker, md);
714 metadump_destroy(md, i + 1);
719 static int write_zero(FILE *out, size_t size)
721 static char zero[BLOCK_SIZE];
722 return fwrite(zero, size, 1, out);
725 static int write_buffers(struct metadump_struct *md, u64 *next)
727 struct meta_cluster_header *header = &md->cluster->header;
728 struct meta_cluster_item *item;
729 struct async_work *async;
735 if (list_empty(&md->ordered))
738 /* wait until all buffers are compressed */
739 while (md->num_items > md->num_ready) {
740 struct timespec ts = {
744 pthread_mutex_unlock(&md->mutex);
745 nanosleep(&ts, NULL);
746 pthread_mutex_lock(&md->mutex);
749 /* setup and write index block */
750 list_for_each_entry(async, &md->ordered, ordered) {
751 item = md->cluster->items + nritems;
752 item->bytenr = cpu_to_le64(async->start);
753 item->size = cpu_to_le32(async->bufsize);
756 header->nritems = cpu_to_le32(nritems);
758 ret = fwrite(md->cluster, BLOCK_SIZE, 1, md->out);
760 fprintf(stderr, "Error writing out cluster: %d\n", errno);
765 bytenr += le64_to_cpu(header->bytenr) + BLOCK_SIZE;
766 while (!list_empty(&md->ordered)) {
767 async = list_entry(md->ordered.next, struct async_work,
769 list_del_init(&async->ordered);
771 bytenr += async->bufsize;
773 ret = fwrite(async->buffer, async->bufsize, 1,
778 fprintf(stderr, "Error writing out cluster: %d\n",
786 /* zero unused space in the last block */
787 if (!err && bytenr & BLOCK_MASK) {
788 size_t size = BLOCK_SIZE - (bytenr & BLOCK_MASK);
791 ret = write_zero(md->out, size);
793 fprintf(stderr, "Error zeroing out buffer: %d\n",
803 static int read_data_extent(struct metadump_struct *md,
804 struct async_work *async)
806 struct btrfs_multi_bio *multi = NULL;
807 struct btrfs_device *device;
808 u64 bytes_left = async->size;
809 u64 logical = async->start;
818 read_len = bytes_left;
819 ret = btrfs_map_block(&md->root->fs_info->mapping_tree, READ,
820 logical, &read_len, &multi, 0, NULL);
822 fprintf(stderr, "Couldn't map data block %d\n", ret);
826 device = multi->stripes[0].dev;
828 if (device->fd == 0) {
830 "Device we need to read from is not open\n");
835 bytenr = multi->stripes[0].physical;
838 read_len = min(read_len, bytes_left);
839 done = pread64(fd, async->buffer+offset, read_len, bytenr);
840 if (done < read_len) {
842 fprintf(stderr, "Error reading extent %d\n",
845 fprintf(stderr, "Short read\n");
857 static int flush_pending(struct metadump_struct *md, int done)
859 struct async_work *async = NULL;
860 struct extent_buffer *eb;
861 u64 blocksize = md->root->nodesize;
867 if (md->pending_size) {
868 async = calloc(1, sizeof(*async));
872 async->start = md->pending_start;
873 async->size = md->pending_size;
874 async->bufsize = async->size;
875 async->buffer = malloc(async->bufsize);
876 if (!async->buffer) {
881 start = async->start;
885 ret = read_data_extent(md, async);
893 while (!md->data && size > 0) {
894 u64 this_read = min(blocksize, size);
895 eb = read_tree_block(md->root, start, this_read, 0);
900 "Error reading metadata block\n");
903 copy_buffer(md, async->buffer + offset, eb);
904 free_extent_buffer(eb);
910 md->pending_start = (u64)-1;
911 md->pending_size = 0;
916 pthread_mutex_lock(&md->mutex);
918 list_add_tail(&async->ordered, &md->ordered);
920 if (md->compress_level > 0) {
921 list_add_tail(&async->list, &md->list);
922 pthread_cond_signal(&md->cond);
927 if (md->num_items >= ITEMS_PER_CLUSTER || done) {
928 ret = write_buffers(md, &start);
930 fprintf(stderr, "Error writing buffers %d\n",
933 meta_cluster_init(md, start);
935 pthread_mutex_unlock(&md->mutex);
939 static int add_extent(u64 start, u64 size, struct metadump_struct *md,
943 if (md->data != data ||
944 md->pending_size + size > MAX_PENDING_SIZE ||
945 md->pending_start + md->pending_size != start) {
946 ret = flush_pending(md, 0);
949 md->pending_start = start;
951 readahead_tree_block(md->root, start, size, 0);
952 md->pending_size += size;
957 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
958 static int is_tree_block(struct btrfs_root *extent_root,
959 struct btrfs_path *path, u64 bytenr)
961 struct extent_buffer *leaf;
962 struct btrfs_key key;
966 leaf = path->nodes[0];
968 struct btrfs_extent_ref_v0 *ref_item;
970 if (path->slots[0] >= btrfs_header_nritems(leaf)) {
971 ret = btrfs_next_leaf(extent_root, path);
976 leaf = path->nodes[0];
978 btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
979 if (key.objectid != bytenr)
981 if (key.type != BTRFS_EXTENT_REF_V0_KEY)
983 ref_item = btrfs_item_ptr(leaf, path->slots[0],
984 struct btrfs_extent_ref_v0);
985 ref_objectid = btrfs_ref_objectid_v0(leaf, ref_item);
986 if (ref_objectid < BTRFS_FIRST_FREE_OBJECTID)
994 static int copy_tree_blocks(struct btrfs_root *root, struct extent_buffer *eb,
995 struct metadump_struct *metadump, int root_tree)
997 struct extent_buffer *tmp;
998 struct btrfs_root_item *ri;
999 struct btrfs_key key;
1006 ret = add_extent(btrfs_header_bytenr(eb), root->leafsize, metadump, 0);
1008 fprintf(stderr, "Error adding metadata block\n");
1012 if (btrfs_header_level(eb) == 0 && !root_tree)
1015 level = btrfs_header_level(eb);
1016 nritems = btrfs_header_nritems(eb);
1017 for (i = 0; i < nritems; i++) {
1019 btrfs_item_key_to_cpu(eb, &key, i);
1020 if (key.type != BTRFS_ROOT_ITEM_KEY)
1022 ri = btrfs_item_ptr(eb, i, struct btrfs_root_item);
1023 bytenr = btrfs_disk_root_bytenr(eb, ri);
1024 tmp = read_tree_block(root, bytenr, root->leafsize, 0);
1027 "Error reading log root block\n");
1030 ret = copy_tree_blocks(root, tmp, metadump, 0);
1031 free_extent_buffer(tmp);
1035 bytenr = btrfs_node_blockptr(eb, i);
1036 tmp = read_tree_block(root, bytenr, root->leafsize, 0);
1038 fprintf(stderr, "Error reading log block\n");
1041 ret = copy_tree_blocks(root, tmp, metadump, root_tree);
1042 free_extent_buffer(tmp);
1051 static int copy_log_trees(struct btrfs_root *root,
1052 struct metadump_struct *metadump,
1053 struct btrfs_path *path)
1055 u64 blocknr = btrfs_super_log_root(root->fs_info->super_copy);
1060 if (!root->fs_info->log_root_tree ||
1061 !root->fs_info->log_root_tree->node) {
1062 fprintf(stderr, "Error copying tree log, it wasn't setup\n");
1066 return copy_tree_blocks(root, root->fs_info->log_root_tree->node,
1070 static int copy_space_cache(struct btrfs_root *root,
1071 struct metadump_struct *metadump,
1072 struct btrfs_path *path)
1074 struct extent_buffer *leaf;
1075 struct btrfs_file_extent_item *fi;
1076 struct btrfs_key key;
1077 u64 bytenr, num_bytes;
1080 root = root->fs_info->tree_root;
1083 key.type = BTRFS_EXTENT_DATA_KEY;
1086 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1088 fprintf(stderr, "Error searching for free space inode %d\n",
1093 leaf = path->nodes[0];
1096 if (path->slots[0] >= btrfs_header_nritems(leaf)) {
1097 ret = btrfs_next_leaf(root, path);
1099 fprintf(stderr, "Error going to next leaf "
1105 leaf = path->nodes[0];
1108 btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
1109 if (key.type != BTRFS_EXTENT_DATA_KEY) {
1114 fi = btrfs_item_ptr(leaf, path->slots[0],
1115 struct btrfs_file_extent_item);
1116 if (btrfs_file_extent_type(leaf, fi) !=
1117 BTRFS_FILE_EXTENT_REG) {
1122 bytenr = btrfs_file_extent_disk_bytenr(leaf, fi);
1123 num_bytes = btrfs_file_extent_disk_num_bytes(leaf, fi);
1124 ret = add_extent(bytenr, num_bytes, metadump, 1);
1126 fprintf(stderr, "Error adding space cache blocks %d\n",
1128 btrfs_release_path(path);
1137 static int copy_from_extent_tree(struct metadump_struct *metadump,
1138 struct btrfs_path *path)
1140 struct btrfs_root *extent_root;
1141 struct extent_buffer *leaf;
1142 struct btrfs_extent_item *ei;
1143 struct btrfs_key key;
1148 extent_root = metadump->root->fs_info->extent_root;
1149 bytenr = BTRFS_SUPER_INFO_OFFSET + 4096;
1150 key.objectid = bytenr;
1151 key.type = BTRFS_EXTENT_ITEM_KEY;
1154 ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0);
1156 fprintf(stderr, "Error searching extent root %d\n", ret);
1161 leaf = path->nodes[0];
1164 if (path->slots[0] >= btrfs_header_nritems(leaf)) {
1165 ret = btrfs_next_leaf(extent_root, path);
1167 fprintf(stderr, "Error going to next leaf %d"
1175 leaf = path->nodes[0];
1178 btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
1179 if (key.objectid < bytenr ||
1180 (key.type != BTRFS_EXTENT_ITEM_KEY &&
1181 key.type != BTRFS_METADATA_ITEM_KEY)) {
1186 bytenr = key.objectid;
1187 if (key.type == BTRFS_METADATA_ITEM_KEY)
1188 num_bytes = extent_root->leafsize;
1190 num_bytes = key.offset;
1192 if (btrfs_item_size_nr(leaf, path->slots[0]) > sizeof(*ei)) {
1193 ei = btrfs_item_ptr(leaf, path->slots[0],
1194 struct btrfs_extent_item);
1195 if (btrfs_extent_flags(leaf, ei) &
1196 BTRFS_EXTENT_FLAG_TREE_BLOCK) {
1197 ret = add_extent(bytenr, num_bytes, metadump,
1200 fprintf(stderr, "Error adding block "
1206 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
1207 ret = is_tree_block(extent_root, path, bytenr);
1209 fprintf(stderr, "Error checking tree block "
1215 ret = add_extent(bytenr, num_bytes, metadump,
1218 fprintf(stderr, "Error adding block "
1225 fprintf(stderr, "Either extent tree corruption or "
1226 "you haven't built with V0 support\n");
1231 bytenr += num_bytes;
1234 btrfs_release_path(path);
1239 static int create_metadump(const char *input, FILE *out, int num_threads,
1240 int compress_level, int sanitize, int walk_trees)
1242 struct btrfs_root *root;
1243 struct btrfs_path *path = NULL;
1244 struct metadump_struct metadump;
1248 root = open_ctree(input, 0, 0);
1250 fprintf(stderr, "Open ctree failed\n");
1254 BUG_ON(root->nodesize != root->leafsize);
1256 ret = metadump_init(&metadump, root, out, num_threads,
1257 compress_level, sanitize);
1259 fprintf(stderr, "Error initing metadump %d\n", ret);
1264 ret = add_extent(BTRFS_SUPER_INFO_OFFSET, 4096, &metadump, 0);
1266 fprintf(stderr, "Error adding metadata %d\n", ret);
1271 path = btrfs_alloc_path();
1273 fprintf(stderr, "Out of memory allocing path\n");
1279 ret = copy_tree_blocks(root, root->fs_info->chunk_root->node,
1286 ret = copy_tree_blocks(root, root->fs_info->tree_root->node,
1293 ret = copy_from_extent_tree(&metadump, path);
1300 ret = copy_log_trees(root, &metadump, path);
1306 ret = copy_space_cache(root, &metadump, path);
1308 ret = flush_pending(&metadump, 1);
1312 fprintf(stderr, "Error flushing pending %d\n", ret);
1315 metadump_destroy(&metadump, num_threads);
1317 btrfs_free_path(path);
1318 ret = close_ctree(root);
1319 return err ? err : ret;
1322 static void update_super_old(u8 *buffer)
1324 struct btrfs_super_block *super = (struct btrfs_super_block *)buffer;
1325 struct btrfs_chunk *chunk;
1326 struct btrfs_disk_key *key;
1327 u32 sectorsize = btrfs_super_sectorsize(super);
1328 u64 flags = btrfs_super_flags(super);
1330 flags |= BTRFS_SUPER_FLAG_METADUMP;
1331 btrfs_set_super_flags(super, flags);
1333 key = (struct btrfs_disk_key *)(super->sys_chunk_array);
1334 chunk = (struct btrfs_chunk *)(super->sys_chunk_array +
1335 sizeof(struct btrfs_disk_key));
1337 btrfs_set_disk_key_objectid(key, BTRFS_FIRST_CHUNK_TREE_OBJECTID);
1338 btrfs_set_disk_key_type(key, BTRFS_CHUNK_ITEM_KEY);
1339 btrfs_set_disk_key_offset(key, 0);
1341 btrfs_set_stack_chunk_length(chunk, (u64)-1);
1342 btrfs_set_stack_chunk_owner(chunk, BTRFS_EXTENT_TREE_OBJECTID);
1343 btrfs_set_stack_chunk_stripe_len(chunk, BTRFS_STRIPE_LEN);
1344 btrfs_set_stack_chunk_type(chunk, BTRFS_BLOCK_GROUP_SYSTEM);
1345 btrfs_set_stack_chunk_io_align(chunk, sectorsize);
1346 btrfs_set_stack_chunk_io_width(chunk, sectorsize);
1347 btrfs_set_stack_chunk_sector_size(chunk, sectorsize);
1348 btrfs_set_stack_chunk_num_stripes(chunk, 1);
1349 btrfs_set_stack_chunk_sub_stripes(chunk, 0);
1350 chunk->stripe.devid = super->dev_item.devid;
1351 btrfs_set_stack_stripe_offset(&chunk->stripe, 0);
1352 memcpy(chunk->stripe.dev_uuid, super->dev_item.uuid, BTRFS_UUID_SIZE);
1353 btrfs_set_super_sys_array_size(super, sizeof(*key) + sizeof(*chunk));
1354 csum_block(buffer, 4096);
1357 static int update_super(u8 *buffer)
1359 struct btrfs_super_block *super = (struct btrfs_super_block *)buffer;
1360 struct btrfs_chunk *chunk;
1361 struct btrfs_disk_key *disk_key;
1362 struct btrfs_key key;
1363 u32 new_array_size = 0;
1366 u8 *ptr, *write_ptr;
1367 int old_num_stripes;
1369 write_ptr = ptr = super->sys_chunk_array;
1370 array_size = btrfs_super_sys_array_size(super);
1372 while (cur < array_size) {
1373 disk_key = (struct btrfs_disk_key *)ptr;
1374 btrfs_disk_key_to_cpu(&key, disk_key);
1376 new_array_size += sizeof(*disk_key);
1377 memmove(write_ptr, ptr, sizeof(*disk_key));
1379 write_ptr += sizeof(*disk_key);
1380 ptr += sizeof(*disk_key);
1381 cur += sizeof(*disk_key);
1383 if (key.type == BTRFS_CHUNK_ITEM_KEY) {
1384 chunk = (struct btrfs_chunk *)ptr;
1385 old_num_stripes = btrfs_stack_chunk_num_stripes(chunk);
1386 chunk = (struct btrfs_chunk *)write_ptr;
1388 memmove(write_ptr, ptr, sizeof(*chunk));
1389 btrfs_set_stack_chunk_num_stripes(chunk, 1);
1390 btrfs_set_stack_chunk_sub_stripes(chunk, 0);
1391 btrfs_set_stack_chunk_type(chunk,
1392 BTRFS_BLOCK_GROUP_SYSTEM);
1393 chunk->stripe.devid = super->dev_item.devid;
1394 memcpy(chunk->stripe.dev_uuid, super->dev_item.uuid,
1396 new_array_size += sizeof(*chunk);
1398 fprintf(stderr, "Bogus key in the sys chunk array "
1402 write_ptr += sizeof(*chunk);
1403 ptr += btrfs_chunk_item_size(old_num_stripes);
1404 cur += btrfs_chunk_item_size(old_num_stripes);
1407 btrfs_set_super_sys_array_size(super, new_array_size);
1408 csum_block(buffer, 4096);
1413 static struct extent_buffer *alloc_dummy_eb(u64 bytenr, u32 size)
1415 struct extent_buffer *eb;
1417 eb = malloc(sizeof(struct extent_buffer) + size);
1420 memset(eb, 0, sizeof(struct extent_buffer) + size);
1427 static void truncate_item(struct extent_buffer *eb, int slot, u32 new_size)
1429 struct btrfs_item *item;
1437 old_size = btrfs_item_size_nr(eb, slot);
1438 if (old_size == new_size)
1441 nritems = btrfs_header_nritems(eb);
1442 data_end = btrfs_item_offset_nr(eb, nritems - 1);
1444 old_data_start = btrfs_item_offset_nr(eb, slot);
1445 size_diff = old_size - new_size;
1447 for (i = slot; i < nritems; i++) {
1449 item = btrfs_item_nr(i);
1450 ioff = btrfs_item_offset(eb, item);
1451 btrfs_set_item_offset(eb, item, ioff + size_diff);
1454 memmove_extent_buffer(eb, btrfs_leaf_data(eb) + data_end + size_diff,
1455 btrfs_leaf_data(eb) + data_end,
1456 old_data_start + new_size - data_end);
1457 item = btrfs_item_nr(slot);
1458 btrfs_set_item_size(eb, item, new_size);
1461 static int fixup_chunk_tree_block(struct mdrestore_struct *mdres,
1462 struct async_work *async, u8 *buffer,
1465 struct extent_buffer *eb;
1466 size_t size_left = size;
1467 u64 bytenr = async->start;
1470 if (size_left % mdres->leafsize)
1473 eb = alloc_dummy_eb(bytenr, mdres->leafsize);
1479 memcpy(eb->data, buffer, mdres->leafsize);
1481 if (btrfs_header_bytenr(eb) != bytenr)
1483 if (memcmp(mdres->fsid,
1484 eb->data + offsetof(struct btrfs_header, fsid),
1488 if (btrfs_header_owner(eb) != BTRFS_CHUNK_TREE_OBJECTID)
1491 if (btrfs_header_level(eb) != 0)
1494 for (i = 0; i < btrfs_header_nritems(eb); i++) {
1495 struct btrfs_chunk chunk;
1496 struct btrfs_key key;
1499 btrfs_item_key_to_cpu(eb, &key, i);
1500 if (key.type != BTRFS_CHUNK_ITEM_KEY)
1502 truncate_item(eb, i, sizeof(chunk));
1503 read_extent_buffer(eb, &chunk,
1504 btrfs_item_ptr_offset(eb, i),
1507 /* Zero out the RAID profile */
1508 type = btrfs_stack_chunk_type(&chunk);
1509 type &= (BTRFS_BLOCK_GROUP_DATA |
1510 BTRFS_BLOCK_GROUP_SYSTEM |
1511 BTRFS_BLOCK_GROUP_METADATA |
1512 BTRFS_BLOCK_GROUP_DUP);
1513 btrfs_set_stack_chunk_type(&chunk, type);
1515 btrfs_set_stack_chunk_num_stripes(&chunk, 1);
1516 btrfs_set_stack_chunk_sub_stripes(&chunk, 0);
1517 btrfs_set_stack_stripe_devid(&chunk.stripe, mdres->devid);
1518 memcpy(chunk.stripe.dev_uuid, mdres->uuid,
1520 write_extent_buffer(eb, &chunk,
1521 btrfs_item_ptr_offset(eb, i),
1524 memcpy(buffer, eb->data, eb->len);
1525 csum_block(buffer, eb->len);
1527 size_left -= mdres->leafsize;
1528 buffer += mdres->leafsize;
1529 bytenr += mdres->leafsize;
1536 static void write_backup_supers(int fd, u8 *buf)
1538 struct btrfs_super_block *super = (struct btrfs_super_block *)buf;
1545 if (fstat(fd, &st)) {
1546 fprintf(stderr, "Couldn't stat restore point, won't be able "
1547 "to write backup supers: %d\n", errno);
1551 size = btrfs_device_size(fd, &st);
1553 for (i = 1; i < BTRFS_SUPER_MIRROR_MAX; i++) {
1554 bytenr = btrfs_sb_offset(i);
1555 if (bytenr + 4096 > size)
1557 btrfs_set_super_bytenr(super, bytenr);
1558 csum_block(buf, 4096);
1559 ret = pwrite64(fd, buf, 4096, bytenr);
1562 fprintf(stderr, "Problem writing out backup "
1563 "super block %d, err %d\n", i, errno);
1565 fprintf(stderr, "Short write writing out "
1566 "backup super block\n");
1572 static u64 logical_to_physical(struct mdrestore_struct *mdres, u64 logical, u64 *size)
1574 struct fs_chunk *fs_chunk;
1575 struct rb_node *entry;
1576 struct fs_chunk search;
1579 if (logical == BTRFS_SUPER_INFO_OFFSET)
1582 search.logical = logical;
1583 entry = tree_search(&mdres->chunk_tree, &search.n, chunk_cmp, 1);
1585 if (mdres->in != stdin)
1586 printf("Couldn't find a chunk, using logical\n");
1589 fs_chunk = rb_entry(entry, struct fs_chunk, n);
1590 if (fs_chunk->logical > logical || fs_chunk->logical + fs_chunk->bytes < logical)
1592 offset = search.logical - fs_chunk->logical;
1594 *size = min(*size, fs_chunk->bytes + fs_chunk->logical - logical);
1595 return fs_chunk->physical + offset;
1598 static void *restore_worker(void *data)
1600 struct mdrestore_struct *mdres = (struct mdrestore_struct *)data;
1601 struct async_work *async;
1607 int compress_size = MAX_PENDING_SIZE * 4;
1609 outfd = fileno(mdres->out);
1610 buffer = malloc(compress_size);
1612 fprintf(stderr, "Error allocing buffer\n");
1613 pthread_mutex_lock(&mdres->mutex);
1615 mdres->error = -ENOMEM;
1616 pthread_mutex_unlock(&mdres->mutex);
1625 pthread_mutex_lock(&mdres->mutex);
1626 while (!mdres->leafsize || list_empty(&mdres->list)) {
1628 pthread_mutex_unlock(&mdres->mutex);
1631 pthread_cond_wait(&mdres->cond, &mdres->mutex);
1633 async = list_entry(mdres->list.next, struct async_work, list);
1634 list_del_init(&async->list);
1635 pthread_mutex_unlock(&mdres->mutex);
1637 if (mdres->compress_method == COMPRESS_ZLIB) {
1638 size = compress_size;
1639 ret = uncompress(buffer, (unsigned long *)&size,
1640 async->buffer, async->bufsize);
1642 fprintf(stderr, "Error decompressing %d\n",
1648 outbuf = async->buffer;
1649 size = async->bufsize;
1652 if (!mdres->multi_devices) {
1653 if (async->start == BTRFS_SUPER_INFO_OFFSET) {
1654 if (mdres->old_restore) {
1655 update_super_old(outbuf);
1657 ret = update_super(outbuf);
1661 } else if (!mdres->old_restore) {
1662 ret = fixup_chunk_tree_block(mdres, async, outbuf, size);
1668 if (!mdres->fixup_offset) {
1670 u64 chunk_size = size;
1671 if (!mdres->multi_devices)
1672 bytenr = logical_to_physical(mdres,
1673 async->start + offset,
1676 bytenr = async->start + offset;
1678 ret = pwrite64(outfd, outbuf+offset, chunk_size,
1680 if (ret != chunk_size) {
1682 fprintf(stderr, "Error writing to "
1683 "device %d\n", errno);
1687 fprintf(stderr, "Short write\n");
1693 offset += chunk_size;
1695 } else if (async->start != BTRFS_SUPER_INFO_OFFSET) {
1696 ret = write_data_to_disk(mdres->info, outbuf, async->start, size, 0);
1698 printk("Error write data\n");
1704 /* backup super blocks are already there at fixup_offset stage */
1705 if (!mdres->multi_devices && async->start == BTRFS_SUPER_INFO_OFFSET)
1706 write_backup_supers(outfd, outbuf);
1708 pthread_mutex_lock(&mdres->mutex);
1709 if (err && !mdres->error)
1712 pthread_mutex_unlock(&mdres->mutex);
1714 free(async->buffer);
1722 static void mdrestore_destroy(struct mdrestore_struct *mdres, int num_threads)
1727 while ((n = rb_first(&mdres->chunk_tree))) {
1728 struct fs_chunk *entry;
1730 entry = rb_entry(n, struct fs_chunk, n);
1731 rb_erase(n, &mdres->chunk_tree);
1734 pthread_mutex_lock(&mdres->mutex);
1736 pthread_cond_broadcast(&mdres->cond);
1737 pthread_mutex_unlock(&mdres->mutex);
1739 for (i = 0; i < num_threads; i++)
1740 pthread_join(mdres->threads[i], NULL);
1742 pthread_cond_destroy(&mdres->cond);
1743 pthread_mutex_destroy(&mdres->mutex);
1744 free(mdres->threads);
1747 static int mdrestore_init(struct mdrestore_struct *mdres,
1748 FILE *in, FILE *out, int old_restore,
1749 int num_threads, int fixup_offset,
1750 struct btrfs_fs_info *info, int multi_devices)
1754 memset(mdres, 0, sizeof(*mdres));
1755 pthread_cond_init(&mdres->cond, NULL);
1756 pthread_mutex_init(&mdres->mutex, NULL);
1757 INIT_LIST_HEAD(&mdres->list);
1760 mdres->old_restore = old_restore;
1761 mdres->chunk_tree.rb_node = NULL;
1762 mdres->fixup_offset = fixup_offset;
1764 mdres->multi_devices = multi_devices;
1769 mdres->num_threads = num_threads;
1770 mdres->threads = calloc(num_threads, sizeof(pthread_t));
1771 if (!mdres->threads)
1773 for (i = 0; i < num_threads; i++) {
1774 ret = pthread_create(mdres->threads + i, NULL, restore_worker,
1780 mdrestore_destroy(mdres, i + 1);
1784 static int fill_mdres_info(struct mdrestore_struct *mdres,
1785 struct async_work *async)
1787 struct btrfs_super_block *super;
1792 /* We've already been initialized */
1793 if (mdres->leafsize)
1796 if (mdres->compress_method == COMPRESS_ZLIB) {
1797 size_t size = MAX_PENDING_SIZE * 2;
1799 buffer = malloc(MAX_PENDING_SIZE * 2);
1802 ret = uncompress(buffer, (unsigned long *)&size,
1803 async->buffer, async->bufsize);
1805 fprintf(stderr, "Error decompressing %d\n", ret);
1811 outbuf = async->buffer;
1814 super = (struct btrfs_super_block *)outbuf;
1815 mdres->leafsize = btrfs_super_leafsize(super);
1816 memcpy(mdres->fsid, super->fsid, BTRFS_FSID_SIZE);
1817 memcpy(mdres->uuid, super->dev_item.uuid,
1819 mdres->devid = le64_to_cpu(super->dev_item.devid);
1824 static int add_cluster(struct meta_cluster *cluster,
1825 struct mdrestore_struct *mdres, u64 *next)
1827 struct meta_cluster_item *item;
1828 struct meta_cluster_header *header = &cluster->header;
1829 struct async_work *async;
1834 BUG_ON(mdres->num_items);
1835 mdres->compress_method = header->compress;
1837 bytenr = le64_to_cpu(header->bytenr) + BLOCK_SIZE;
1838 nritems = le32_to_cpu(header->nritems);
1839 for (i = 0; i < nritems; i++) {
1840 item = &cluster->items[i];
1841 async = calloc(1, sizeof(*async));
1843 fprintf(stderr, "Error allocating async\n");
1846 async->start = le64_to_cpu(item->bytenr);
1847 async->bufsize = le32_to_cpu(item->size);
1848 async->buffer = malloc(async->bufsize);
1849 if (!async->buffer) {
1850 fprintf(stderr, "Error allocing async buffer\n");
1854 ret = fread(async->buffer, async->bufsize, 1, mdres->in);
1856 fprintf(stderr, "Error reading buffer %d\n", errno);
1857 free(async->buffer);
1861 bytenr += async->bufsize;
1863 pthread_mutex_lock(&mdres->mutex);
1864 if (async->start == BTRFS_SUPER_INFO_OFFSET) {
1865 ret = fill_mdres_info(mdres, async);
1867 fprintf(stderr, "Error setting up restore\n");
1868 pthread_mutex_unlock(&mdres->mutex);
1869 free(async->buffer);
1874 list_add_tail(&async->list, &mdres->list);
1876 pthread_cond_signal(&mdres->cond);
1877 pthread_mutex_unlock(&mdres->mutex);
1879 if (bytenr & BLOCK_MASK) {
1880 char buffer[BLOCK_MASK];
1881 size_t size = BLOCK_SIZE - (bytenr & BLOCK_MASK);
1884 ret = fread(buffer, size, 1, mdres->in);
1886 fprintf(stderr, "Error reading in buffer %d\n", errno);
1894 static int wait_for_worker(struct mdrestore_struct *mdres)
1898 pthread_mutex_lock(&mdres->mutex);
1900 while (!ret && mdres->num_items > 0) {
1901 struct timespec ts = {
1903 .tv_nsec = 10000000,
1905 pthread_mutex_unlock(&mdres->mutex);
1906 nanosleep(&ts, NULL);
1907 pthread_mutex_lock(&mdres->mutex);
1910 pthread_mutex_unlock(&mdres->mutex);
1914 static int read_chunk_block(struct mdrestore_struct *mdres, u8 *buffer,
1915 u64 bytenr, u64 item_bytenr, u32 bufsize,
1918 struct extent_buffer *eb;
1922 eb = alloc_dummy_eb(bytenr, mdres->leafsize);
1928 while (item_bytenr != bytenr) {
1929 buffer += mdres->leafsize;
1930 item_bytenr += mdres->leafsize;
1933 memcpy(eb->data, buffer, mdres->leafsize);
1934 if (btrfs_header_bytenr(eb) != bytenr) {
1935 fprintf(stderr, "Eb bytenr doesn't match found bytenr\n");
1940 if (memcmp(mdres->fsid, eb->data + offsetof(struct btrfs_header, fsid),
1942 fprintf(stderr, "Fsid doesn't match\n");
1947 if (btrfs_header_owner(eb) != BTRFS_CHUNK_TREE_OBJECTID) {
1948 fprintf(stderr, "Does not belong to the chunk tree\n");
1953 for (i = 0; i < btrfs_header_nritems(eb); i++) {
1954 struct btrfs_chunk chunk;
1955 struct fs_chunk *fs_chunk;
1956 struct btrfs_key key;
1958 if (btrfs_header_level(eb)) {
1959 u64 blockptr = btrfs_node_blockptr(eb, i);
1961 ret = search_for_chunk_blocks(mdres, blockptr,
1968 /* Yay a leaf! We loves leafs! */
1969 btrfs_item_key_to_cpu(eb, &key, i);
1970 if (key.type != BTRFS_CHUNK_ITEM_KEY)
1973 fs_chunk = malloc(sizeof(struct fs_chunk));
1975 fprintf(stderr, "Erorr allocating chunk\n");
1979 memset(fs_chunk, 0, sizeof(*fs_chunk));
1980 read_extent_buffer(eb, &chunk, btrfs_item_ptr_offset(eb, i),
1983 fs_chunk->logical = key.offset;
1984 fs_chunk->physical = btrfs_stack_stripe_offset(&chunk.stripe);
1985 fs_chunk->bytes = btrfs_stack_chunk_length(&chunk);
1986 tree_insert(&mdres->chunk_tree, &fs_chunk->n, chunk_cmp);
1993 /* If you have to ask you aren't worthy */
1994 static int search_for_chunk_blocks(struct mdrestore_struct *mdres,
1995 u64 search, u64 cluster_bytenr)
1997 struct meta_cluster *cluster;
1998 struct meta_cluster_header *header;
1999 struct meta_cluster_item *item;
2000 u64 current_cluster = cluster_bytenr, bytenr;
2002 u32 bufsize, nritems, i;
2003 u32 max_size = MAX_PENDING_SIZE * 2;
2004 u8 *buffer, *tmp = NULL;
2007 cluster = malloc(BLOCK_SIZE);
2009 fprintf(stderr, "Error allocating cluster\n");
2013 buffer = malloc(max_size);
2015 fprintf(stderr, "Error allocing buffer\n");
2020 if (mdres->compress_method == COMPRESS_ZLIB) {
2021 tmp = malloc(max_size);
2023 fprintf(stderr, "Error allocing tmp buffer\n");
2030 bytenr = current_cluster;
2032 if (fseek(mdres->in, current_cluster, SEEK_SET)) {
2033 fprintf(stderr, "Error seeking: %d\n", errno);
2038 ret = fread(cluster, BLOCK_SIZE, 1, mdres->in);
2040 if (cluster_bytenr != 0) {
2042 current_cluster = 0;
2046 printf("ok this is where we screwed up?\n");
2049 } else if (ret < 0) {
2050 fprintf(stderr, "Error reading image\n");
2055 header = &cluster->header;
2056 if (le64_to_cpu(header->magic) != HEADER_MAGIC ||
2057 le64_to_cpu(header->bytenr) != current_cluster) {
2058 fprintf(stderr, "bad header in metadump image\n");
2063 bytenr += BLOCK_SIZE;
2064 nritems = le32_to_cpu(header->nritems);
2065 for (i = 0; i < nritems; i++) {
2068 item = &cluster->items[i];
2069 bufsize = le32_to_cpu(item->size);
2070 item_bytenr = le64_to_cpu(item->bytenr);
2072 if (bufsize > max_size) {
2073 fprintf(stderr, "item %u size %u too big\n",
2079 if (mdres->compress_method == COMPRESS_ZLIB) {
2080 ret = fread(tmp, bufsize, 1, mdres->in);
2082 fprintf(stderr, "Error reading: %d\n",
2089 ret = uncompress(buffer,
2090 (unsigned long *)&size, tmp,
2093 fprintf(stderr, "Error decompressing "
2099 ret = fread(buffer, bufsize, 1, mdres->in);
2101 fprintf(stderr, "Error reading: %d\n",
2110 if (item_bytenr <= search &&
2111 item_bytenr + size > search) {
2112 ret = read_chunk_block(mdres, buffer, search,
2126 if (bytenr & BLOCK_MASK)
2127 bytenr += BLOCK_SIZE - (bytenr & BLOCK_MASK);
2128 current_cluster = bytenr;
2137 static int build_chunk_tree(struct mdrestore_struct *mdres,
2138 struct meta_cluster *cluster)
2140 struct btrfs_super_block *super;
2141 struct meta_cluster_header *header;
2142 struct meta_cluster_item *item = NULL;
2143 u64 chunk_root_bytenr = 0;
2149 /* We can't seek with stdin so don't bother doing this */
2150 if (mdres->in == stdin)
2153 ret = fread(cluster, BLOCK_SIZE, 1, mdres->in);
2155 fprintf(stderr, "Error reading in cluster: %d\n", errno);
2160 header = &cluster->header;
2161 if (le64_to_cpu(header->magic) != HEADER_MAGIC ||
2162 le64_to_cpu(header->bytenr) != 0) {
2163 fprintf(stderr, "bad header in metadump image\n");
2167 bytenr += BLOCK_SIZE;
2168 mdres->compress_method = header->compress;
2169 nritems = le32_to_cpu(header->nritems);
2170 for (i = 0; i < nritems; i++) {
2171 item = &cluster->items[i];
2173 if (le64_to_cpu(item->bytenr) == BTRFS_SUPER_INFO_OFFSET)
2175 bytenr += le32_to_cpu(item->size);
2176 if (fseek(mdres->in, le32_to_cpu(item->size), SEEK_CUR)) {
2177 fprintf(stderr, "Error seeking: %d\n", errno);
2182 if (!item || le64_to_cpu(item->bytenr) != BTRFS_SUPER_INFO_OFFSET) {
2183 fprintf(stderr, "Huh, didn't find the super?\n");
2187 buffer = malloc(le32_to_cpu(item->size));
2189 fprintf(stderr, "Error allocing buffer\n");
2193 ret = fread(buffer, le32_to_cpu(item->size), 1, mdres->in);
2195 fprintf(stderr, "Error reading buffer: %d\n", errno);
2200 if (mdres->compress_method == COMPRESS_ZLIB) {
2201 size_t size = MAX_PENDING_SIZE * 2;
2204 tmp = malloc(MAX_PENDING_SIZE * 2);
2209 ret = uncompress(tmp, (unsigned long *)&size,
2210 buffer, le32_to_cpu(item->size));
2212 fprintf(stderr, "Error decompressing %d\n", ret);
2221 pthread_mutex_lock(&mdres->mutex);
2222 super = (struct btrfs_super_block *)buffer;
2223 chunk_root_bytenr = btrfs_super_chunk_root(super);
2224 mdres->leafsize = btrfs_super_leafsize(super);
2225 memcpy(mdres->fsid, super->fsid, BTRFS_FSID_SIZE);
2226 memcpy(mdres->uuid, super->dev_item.uuid,
2228 mdres->devid = le64_to_cpu(super->dev_item.devid);
2230 pthread_mutex_unlock(&mdres->mutex);
2232 return search_for_chunk_blocks(mdres, chunk_root_bytenr, 0);
2235 static int __restore_metadump(const char *input, FILE *out, int old_restore,
2236 int num_threads, int fixup_offset,
2237 const char *target, int multi_devices)
2239 struct meta_cluster *cluster = NULL;
2240 struct meta_cluster_header *header;
2241 struct mdrestore_struct mdrestore;
2242 struct btrfs_fs_info *info = NULL;
2247 if (!strcmp(input, "-")) {
2250 in = fopen(input, "r");
2252 perror("unable to open metadump image");
2257 /* NOTE: open with write mode */
2260 info = open_ctree_fs_info(target, 0, 0,
2262 OPEN_CTREE_RESTORE |
2263 OPEN_CTREE_PARTIAL);
2265 fprintf(stderr, "%s: open ctree failed\n", __func__);
2271 cluster = malloc(BLOCK_SIZE);
2273 fprintf(stderr, "Error allocating cluster\n");
2278 ret = mdrestore_init(&mdrestore, in, out, old_restore, num_threads,
2279 fixup_offset, info, multi_devices);
2281 fprintf(stderr, "Error initing mdrestore %d\n", ret);
2282 goto failed_cluster;
2285 if (!multi_devices) {
2286 ret = build_chunk_tree(&mdrestore, cluster);
2291 if (in != stdin && fseek(in, 0, SEEK_SET)) {
2292 fprintf(stderr, "Error seeking %d\n", errno);
2297 ret = fread(cluster, BLOCK_SIZE, 1, in);
2301 header = &cluster->header;
2302 if (le64_to_cpu(header->magic) != HEADER_MAGIC ||
2303 le64_to_cpu(header->bytenr) != bytenr) {
2304 fprintf(stderr, "bad header in metadump image\n");
2308 ret = add_cluster(cluster, &mdrestore, &bytenr);
2310 fprintf(stderr, "Error adding cluster\n");
2314 ret = wait_for_worker(&mdrestore);
2316 fprintf(stderr, "One of the threads errored out %d\n",
2322 mdrestore_destroy(&mdrestore, num_threads);
2326 if (fixup_offset && info)
2327 close_ctree(info->chunk_root);
2334 static int restore_metadump(const char *input, FILE *out, int old_restore,
2335 int num_threads, int multi_devices)
2337 return __restore_metadump(input, out, old_restore, num_threads, 0, NULL,
2341 static int fixup_metadump(const char *input, FILE *out, int num_threads,
2344 return __restore_metadump(input, out, 0, num_threads, 1, target, 1);
2347 static int update_disk_super_on_device(struct btrfs_fs_info *info,
2348 const char *other_dev, u64 cur_devid)
2350 struct btrfs_key key;
2351 struct extent_buffer *leaf;
2352 struct btrfs_path path;
2353 struct btrfs_dev_item *dev_item;
2354 struct btrfs_super_block *disk_super;
2355 char dev_uuid[BTRFS_UUID_SIZE];
2356 char fs_uuid[BTRFS_UUID_SIZE];
2357 u64 devid, type, io_align, io_width;
2358 u64 sector_size, total_bytes, bytes_used;
2363 key.objectid = BTRFS_DEV_ITEMS_OBJECTID;
2364 key.type = BTRFS_DEV_ITEM_KEY;
2365 key.offset = cur_devid;
2367 btrfs_init_path(&path);
2368 ret = btrfs_search_slot(NULL, info->chunk_root, &key, &path, 0, 0);
2370 fprintf(stderr, "search key fails\n");
2374 leaf = path.nodes[0];
2375 dev_item = btrfs_item_ptr(leaf, path.slots[0],
2376 struct btrfs_dev_item);
2378 devid = btrfs_device_id(leaf, dev_item);
2379 if (devid != cur_devid) {
2380 printk("devid %llu mismatch with %llu\n", devid, cur_devid);
2384 type = btrfs_device_type(leaf, dev_item);
2385 io_align = btrfs_device_io_align(leaf, dev_item);
2386 io_width = btrfs_device_io_width(leaf, dev_item);
2387 sector_size = btrfs_device_sector_size(leaf, dev_item);
2388 total_bytes = btrfs_device_total_bytes(leaf, dev_item);
2389 bytes_used = btrfs_device_bytes_used(leaf, dev_item);
2390 read_extent_buffer(leaf, dev_uuid, (unsigned long)btrfs_device_uuid(dev_item), BTRFS_UUID_SIZE);
2391 read_extent_buffer(leaf, fs_uuid, (unsigned long)btrfs_device_fsid(dev_item), BTRFS_UUID_SIZE);
2393 btrfs_release_path(&path);
2395 printk("update disk super on %s devid=%llu\n", other_dev, devid);
2397 /* update other devices' super block */
2398 fp = open(other_dev, O_CREAT | O_RDWR, 0600);
2400 fprintf(stderr, "could not open %s\n", other_dev);
2404 buf = malloc(BTRFS_SUPER_INFO_SIZE);
2410 memcpy(buf, info->super_copy, BTRFS_SUPER_INFO_SIZE);
2412 disk_super = (struct btrfs_super_block *)buf;
2413 dev_item = &disk_super->dev_item;
2415 btrfs_set_stack_device_type(dev_item, type);
2416 btrfs_set_stack_device_id(dev_item, devid);
2417 btrfs_set_stack_device_total_bytes(dev_item, total_bytes);
2418 btrfs_set_stack_device_bytes_used(dev_item, bytes_used);
2419 btrfs_set_stack_device_io_align(dev_item, io_align);
2420 btrfs_set_stack_device_io_width(dev_item, io_width);
2421 btrfs_set_stack_device_sector_size(dev_item, sector_size);
2422 memcpy(dev_item->uuid, dev_uuid, BTRFS_UUID_SIZE);
2423 memcpy(dev_item->fsid, fs_uuid, BTRFS_UUID_SIZE);
2424 csum_block((u8 *)buf, BTRFS_SUPER_INFO_SIZE);
2426 ret = pwrite64(fp, buf, BTRFS_SUPER_INFO_SIZE, BTRFS_SUPER_INFO_OFFSET);
2427 if (ret != BTRFS_SUPER_INFO_SIZE) {
2432 write_backup_supers(fp, (u8 *)buf);
2440 static void print_usage(void)
2442 fprintf(stderr, "usage: btrfs-image [options] source target\n");
2443 fprintf(stderr, "\t-r \trestore metadump image\n");
2444 fprintf(stderr, "\t-c value\tcompression level (0 ~ 9)\n");
2445 fprintf(stderr, "\t-t value\tnumber of threads (1 ~ 32)\n");
2446 fprintf(stderr, "\t-o \tdon't mess with the chunk tree when restoring\n");
2447 fprintf(stderr, "\t-s \tsanitize file names, use once to just use garbage, use twice if you want crc collisions\n");
2448 fprintf(stderr, "\t-w \twalk all trees instead of using extent tree, do this if your extent tree is broken\n");
2452 int main(int argc, char *argv[])
2456 u64 num_threads = 0;
2457 u64 compress_level = 0;
2459 int old_restore = 0;
2461 int multi_devices = 0;
2468 int c = getopt(argc, argv, "rc:t:oswm");
2476 num_threads = arg_strtou64(optarg);
2477 if (num_threads > 32)
2481 compress_level = arg_strtou64(optarg);
2482 if (compress_level > 9)
2503 if ((old_restore) && create)
2506 argc = argc - optind;
2509 if (multi_devices && dev_cnt < 2)
2511 if (!multi_devices && dev_cnt != 1)
2514 source = argv[optind];
2515 target = argv[optind + 1];
2517 if (create && !strcmp(target, "-")) {
2520 out = fopen(target, "w+");
2522 perror("unable to create target file");
2527 if (num_threads == 0 && compress_level > 0) {
2528 num_threads = sysconf(_SC_NPROCESSORS_ONLN);
2529 if (num_threads <= 0)
2534 ret = create_metadump(source, out, num_threads,
2535 compress_level, sanitize, walk_trees);
2537 ret = restore_metadump(source, out, old_restore, 1,
2540 printk("%s failed (%s)\n", (create) ? "create" : "restore",
2545 /* extended support for multiple devices */
2546 if (!create && multi_devices) {
2547 struct btrfs_fs_info *info;
2551 info = open_ctree_fs_info(target, 0, 0,
2552 OPEN_CTREE_PARTIAL |
2553 OPEN_CTREE_RESTORE);
2556 fprintf(stderr, "unable to open %s error = %s\n",
2557 target, strerror(e));
2561 total_devs = btrfs_super_num_devices(info->super_copy);
2562 if (total_devs != dev_cnt) {
2563 printk("it needs %llu devices but has only %d\n",
2564 total_devs, dev_cnt);
2565 close_ctree(info->chunk_root);
2569 /* update super block on other disks */
2570 for (i = 2; i <= dev_cnt; i++) {
2571 ret = update_disk_super_on_device(info,
2572 argv[optind + i], (u64)i);
2574 printk("update disk super failed devid=%d (error=%d)\n",
2576 close_ctree(info->chunk_root);
2581 close_ctree(info->chunk_root);
2583 /* fix metadata block to map correct chunk */
2584 ret = fixup_metadump(source, out, 1, target);
2586 fprintf(stderr, "fix metadump failed (error=%d)\n",