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"
39 #define HEADER_MAGIC 0xbd5c25e27295668bULL
40 #define MAX_PENDING_SIZE (256 * 1024)
41 #define BLOCK_SIZE 1024
42 #define BLOCK_MASK (BLOCK_SIZE - 1)
44 #define COMPRESS_NONE 0
45 #define COMPRESS_ZLIB 1
47 struct meta_cluster_item {
50 } __attribute__ ((__packed__));
52 struct meta_cluster_header {
57 } __attribute__ ((__packed__));
59 /* cluster header + index items + buffers */
61 struct meta_cluster_header header;
62 struct meta_cluster_item items[];
63 } __attribute__ ((__packed__));
65 #define ITEMS_PER_CLUSTER ((BLOCK_SIZE - sizeof(struct meta_cluster)) / \
66 sizeof(struct meta_cluster_item))
76 struct list_head list;
77 struct list_head ordered;
85 struct metadump_struct {
86 struct btrfs_root *root;
89 struct meta_cluster *cluster;
93 pthread_mutex_t mutex;
95 struct rb_root name_tree;
97 struct list_head list;
98 struct list_head ordered;
118 struct mdrestore_struct {
124 pthread_mutex_t mutex;
127 struct rb_root chunk_tree;
128 struct list_head list;
132 u8 uuid[BTRFS_UUID_SIZE];
133 u8 fsid[BTRFS_FSID_SIZE];
141 static int search_for_chunk_blocks(struct mdrestore_struct *mdres,
142 u64 search, u64 cluster_bytenr);
143 static struct extent_buffer *alloc_dummy_eb(u64 bytenr, u32 size);
145 static void csum_block(u8 *buf, size_t len)
147 char result[BTRFS_CRC32_SIZE];
149 crc = crc32c(crc, buf + BTRFS_CSUM_SIZE, len - BTRFS_CSUM_SIZE);
150 btrfs_csum_final(crc, result);
151 memcpy(buf, result, BTRFS_CRC32_SIZE);
154 static int has_name(struct btrfs_key *key)
157 case BTRFS_DIR_ITEM_KEY:
158 case BTRFS_DIR_INDEX_KEY:
159 case BTRFS_INODE_REF_KEY:
160 case BTRFS_INODE_EXTREF_KEY:
169 static char *generate_garbage(u32 name_len)
171 char *buf = malloc(name_len);
177 for (i = 0; i < name_len; i++) {
178 char c = rand() % 94 + 33;
188 static int name_cmp(struct rb_node *a, struct rb_node *b, int fuzz)
190 struct name *entry = rb_entry(a, struct name, n);
191 struct name *ins = rb_entry(b, struct name, n);
194 len = min(ins->len, entry->len);
195 return memcmp(ins->val, entry->val, len);
198 static int chunk_cmp(struct rb_node *a, struct rb_node *b, int fuzz)
200 struct fs_chunk *entry = rb_entry(a, struct fs_chunk, n);
201 struct fs_chunk *ins = rb_entry(b, struct fs_chunk, n);
203 if (fuzz && ins->logical >= entry->logical &&
204 ins->logical < entry->logical + entry->bytes)
207 if (ins->logical < entry->logical)
209 else if (ins->logical > entry->logical)
214 static void tree_insert(struct rb_root *root, struct rb_node *ins,
215 int (*cmp)(struct rb_node *a, struct rb_node *b,
218 struct rb_node ** p = &root->rb_node;
219 struct rb_node * parent = NULL;
225 dir = cmp(*p, ins, 0);
234 rb_link_node(ins, parent, p);
235 rb_insert_color(ins, root);
238 static struct rb_node *tree_search(struct rb_root *root,
239 struct rb_node *search,
240 int (*cmp)(struct rb_node *a,
241 struct rb_node *b, int fuzz),
244 struct rb_node *n = root->rb_node;
248 dir = cmp(n, search, fuzz);
260 static char *find_collision(struct metadump_struct *md, char *name,
264 struct rb_node *entry;
266 unsigned long checksum;
272 entry = tree_search(&md->name_tree, &tmp.n, name_cmp, 0);
274 val = rb_entry(entry, struct name, n);
279 val = malloc(sizeof(struct name));
281 fprintf(stderr, "Couldn't sanitize name, enomem\n");
285 memset(val, 0, sizeof(*val));
289 val->sub = malloc(name_len);
291 fprintf(stderr, "Couldn't sanitize name, enomem\n");
296 checksum = crc32c(~1, val->val, name_len);
297 memset(val->sub, ' ', name_len);
300 if (crc32c(~1, val->sub, name_len) == checksum &&
301 memcmp(val->sub, val->val, val->len)) {
306 if (val->sub[i] == 127) {
311 } while (val->sub[i] == 127);
316 if (val->sub[i] == '/')
318 memset(val->sub, ' ', i);
323 if (val->sub[i] == '/')
329 fprintf(stderr, "Couldn't find a collision for '%.*s', "
330 "generating normal garbage, it won't match indexes\n",
332 for (i = 0; i < name_len; i++) {
333 char c = rand() % 94 + 33;
341 tree_insert(&md->name_tree, &val->n, name_cmp);
345 static void sanitize_dir_item(struct metadump_struct *md, struct extent_buffer *eb,
348 struct btrfs_dir_item *dir_item;
351 unsigned long name_ptr;
356 int free_garbage = (md->sanitize_names == 1);
358 dir_item = btrfs_item_ptr(eb, slot, struct btrfs_dir_item);
359 total_len = btrfs_item_size_nr(eb, slot);
360 while (cur < total_len) {
361 this_len = sizeof(*dir_item) +
362 btrfs_dir_name_len(eb, dir_item) +
363 btrfs_dir_data_len(eb, dir_item);
364 name_ptr = (unsigned long)(dir_item + 1);
365 name_len = btrfs_dir_name_len(eb, dir_item);
367 if (md->sanitize_names > 1) {
368 buf = malloc(name_len);
370 fprintf(stderr, "Couldn't sanitize name, "
374 read_extent_buffer(eb, buf, name_ptr, name_len);
375 garbage = find_collision(md, buf, name_len);
377 garbage = generate_garbage(name_len);
380 fprintf(stderr, "Couldn't sanitize name, enomem\n");
383 write_extent_buffer(eb, garbage, name_ptr, name_len);
385 dir_item = (struct btrfs_dir_item *)((char *)dir_item +
392 static void sanitize_inode_ref(struct metadump_struct *md,
393 struct extent_buffer *eb, int slot, int ext)
395 struct btrfs_inode_extref *extref;
396 struct btrfs_inode_ref *ref;
399 unsigned long name_ptr;
403 int free_garbage = (md->sanitize_names == 1);
405 item_size = btrfs_item_size_nr(eb, slot);
406 ptr = btrfs_item_ptr_offset(eb, slot);
407 while (cur_offset < item_size) {
409 extref = (struct btrfs_inode_extref *)(ptr +
411 name_ptr = (unsigned long)(&extref->name);
412 len = btrfs_inode_extref_name_len(eb, extref);
413 cur_offset += sizeof(*extref);
415 ref = (struct btrfs_inode_ref *)(ptr + cur_offset);
416 len = btrfs_inode_ref_name_len(eb, ref);
417 name_ptr = (unsigned long)(ref + 1);
418 cur_offset += sizeof(*ref);
422 if (md->sanitize_names > 1) {
425 fprintf(stderr, "Couldn't sanitize name, "
429 read_extent_buffer(eb, buf, name_ptr, len);
430 garbage = find_collision(md, buf, len);
432 garbage = generate_garbage(len);
436 fprintf(stderr, "Couldn't sanitize name, enomem\n");
439 write_extent_buffer(eb, garbage, name_ptr, len);
445 static void sanitize_name(struct metadump_struct *md, u8 *dst,
446 struct extent_buffer *src, struct btrfs_key *key,
449 struct extent_buffer *eb;
451 eb = alloc_dummy_eb(src->start, src->len);
453 fprintf(stderr, "Couldn't sanitize name, no memory\n");
457 memcpy(eb->data, dst, eb->len);
460 case BTRFS_DIR_ITEM_KEY:
461 case BTRFS_DIR_INDEX_KEY:
462 sanitize_dir_item(md, eb, slot);
464 case BTRFS_INODE_REF_KEY:
465 sanitize_inode_ref(md, eb, slot, 0);
467 case BTRFS_INODE_EXTREF_KEY:
468 sanitize_inode_ref(md, eb, slot, 1);
474 memcpy(dst, eb->data, eb->len);
479 * zero inline extents and csum items
481 static void zero_items(struct metadump_struct *md, u8 *dst,
482 struct extent_buffer *src)
484 struct btrfs_file_extent_item *fi;
485 struct btrfs_item *item;
486 struct btrfs_key key;
487 u32 nritems = btrfs_header_nritems(src);
492 for (i = 0; i < nritems; i++) {
493 item = btrfs_item_nr(src, i);
494 btrfs_item_key_to_cpu(src, &key, i);
495 if (key.type == BTRFS_CSUM_ITEM_KEY) {
496 size = btrfs_item_size_nr(src, i);
497 memset(dst + btrfs_leaf_data(src) +
498 btrfs_item_offset_nr(src, i), 0, size);
502 if (md->sanitize_names && has_name(&key)) {
503 sanitize_name(md, dst, src, &key, i);
507 if (key.type != BTRFS_EXTENT_DATA_KEY)
510 fi = btrfs_item_ptr(src, i, struct btrfs_file_extent_item);
511 extent_type = btrfs_file_extent_type(src, fi);
512 if (extent_type != BTRFS_FILE_EXTENT_INLINE)
515 ptr = btrfs_file_extent_inline_start(fi);
516 size = btrfs_file_extent_inline_item_len(src, item);
517 memset(dst + ptr, 0, size);
522 * copy buffer and zero useless data in the buffer
524 static void copy_buffer(struct metadump_struct *md, u8 *dst,
525 struct extent_buffer *src)
531 memcpy(dst, src->data, src->len);
532 if (src->start == BTRFS_SUPER_INFO_OFFSET)
535 level = btrfs_header_level(src);
536 nritems = btrfs_header_nritems(src);
539 size = sizeof(struct btrfs_header);
540 memset(dst + size, 0, src->len - size);
541 } else if (level == 0) {
542 size = btrfs_leaf_data(src) +
543 btrfs_item_offset_nr(src, nritems - 1) -
544 btrfs_item_nr_offset(nritems);
545 memset(dst + btrfs_item_nr_offset(nritems), 0, size);
546 zero_items(md, dst, src);
548 size = offsetof(struct btrfs_node, ptrs) +
549 sizeof(struct btrfs_key_ptr) * nritems;
550 memset(dst + size, 0, src->len - size);
552 csum_block(dst, src->len);
555 static void *dump_worker(void *data)
557 struct metadump_struct *md = (struct metadump_struct *)data;
558 struct async_work *async;
562 pthread_mutex_lock(&md->mutex);
563 while (list_empty(&md->list)) {
565 pthread_mutex_unlock(&md->mutex);
568 pthread_cond_wait(&md->cond, &md->mutex);
570 async = list_entry(md->list.next, struct async_work, list);
571 list_del_init(&async->list);
572 pthread_mutex_unlock(&md->mutex);
574 if (md->compress_level > 0) {
575 u8 *orig = async->buffer;
577 async->bufsize = compressBound(async->size);
578 async->buffer = malloc(async->bufsize);
580 ret = compress2(async->buffer,
581 (unsigned long *)&async->bufsize,
582 orig, async->size, md->compress_level);
590 pthread_mutex_lock(&md->mutex);
592 pthread_mutex_unlock(&md->mutex);
598 static void meta_cluster_init(struct metadump_struct *md, u64 start)
600 struct meta_cluster_header *header;
604 header = &md->cluster->header;
605 header->magic = cpu_to_le64(HEADER_MAGIC);
606 header->bytenr = cpu_to_le64(start);
607 header->nritems = cpu_to_le32(0);
608 header->compress = md->compress_level > 0 ?
609 COMPRESS_ZLIB : COMPRESS_NONE;
612 static int metadump_init(struct metadump_struct *md, struct btrfs_root *root,
613 FILE *out, int num_threads, int compress_level,
618 memset(md, 0, sizeof(*md));
619 pthread_cond_init(&md->cond, NULL);
620 pthread_mutex_init(&md->mutex, NULL);
621 INIT_LIST_HEAD(&md->list);
622 INIT_LIST_HEAD(&md->ordered);
625 md->pending_start = (u64)-1;
626 md->compress_level = compress_level;
627 md->cluster = calloc(1, BLOCK_SIZE);
628 md->sanitize_names = sanitize_names;
629 if (sanitize_names > 1)
630 crc32c_optimization_init();
633 pthread_cond_destroy(&md->cond);
634 pthread_mutex_destroy(&md->mutex);
638 meta_cluster_init(md, 0);
642 md->name_tree.rb_node = NULL;
643 md->num_threads = num_threads;
644 md->threads = calloc(num_threads, sizeof(pthread_t));
647 pthread_cond_destroy(&md->cond);
648 pthread_mutex_destroy(&md->mutex);
652 for (i = 0; i < num_threads; i++) {
653 ret = pthread_create(md->threads + i, NULL, dump_worker, md);
659 pthread_mutex_lock(&md->mutex);
661 pthread_cond_broadcast(&md->cond);
662 pthread_mutex_unlock(&md->mutex);
664 for (i--; i >= 0; i--)
665 pthread_join(md->threads[i], NULL);
667 pthread_cond_destroy(&md->cond);
668 pthread_mutex_destroy(&md->mutex);
676 static void metadump_destroy(struct metadump_struct *md)
681 pthread_mutex_lock(&md->mutex);
683 pthread_cond_broadcast(&md->cond);
684 pthread_mutex_unlock(&md->mutex);
686 for (i = 0; i < md->num_threads; i++)
687 pthread_join(md->threads[i], NULL);
689 pthread_cond_destroy(&md->cond);
690 pthread_mutex_destroy(&md->mutex);
692 while ((n = rb_first(&md->name_tree))) {
695 name = rb_entry(n, struct name, n);
696 rb_erase(n, &md->name_tree);
705 static int write_zero(FILE *out, size_t size)
707 static char zero[BLOCK_SIZE];
708 return fwrite(zero, size, 1, out);
711 static int write_buffers(struct metadump_struct *md, u64 *next)
713 struct meta_cluster_header *header = &md->cluster->header;
714 struct meta_cluster_item *item;
715 struct async_work *async;
721 if (list_empty(&md->ordered))
724 /* wait until all buffers are compressed */
725 while (md->num_items > md->num_ready) {
726 struct timespec ts = {
730 pthread_mutex_unlock(&md->mutex);
731 nanosleep(&ts, NULL);
732 pthread_mutex_lock(&md->mutex);
735 /* setup and write index block */
736 list_for_each_entry(async, &md->ordered, ordered) {
737 item = md->cluster->items + nritems;
738 item->bytenr = cpu_to_le64(async->start);
739 item->size = cpu_to_le32(async->bufsize);
742 header->nritems = cpu_to_le32(nritems);
744 ret = fwrite(md->cluster, BLOCK_SIZE, 1, md->out);
746 fprintf(stderr, "Error writing out cluster: %d\n", errno);
751 bytenr += le64_to_cpu(header->bytenr) + BLOCK_SIZE;
752 while (!list_empty(&md->ordered)) {
753 async = list_entry(md->ordered.next, struct async_work,
755 list_del_init(&async->ordered);
757 bytenr += async->bufsize;
759 ret = fwrite(async->buffer, async->bufsize, 1,
764 fprintf(stderr, "Error writing out cluster: %d\n",
772 /* zero unused space in the last block */
773 if (!err && bytenr & BLOCK_MASK) {
774 size_t size = BLOCK_SIZE - (bytenr & BLOCK_MASK);
777 ret = write_zero(md->out, size);
779 fprintf(stderr, "Error zeroing out buffer: %d\n",
789 static int read_data_extent(struct metadump_struct *md,
790 struct async_work *async)
792 struct btrfs_multi_bio *multi = NULL;
793 struct btrfs_device *device;
794 u64 bytes_left = async->size;
795 u64 logical = async->start;
804 read_len = bytes_left;
805 ret = btrfs_map_block(&md->root->fs_info->mapping_tree, READ,
806 logical, &read_len, &multi, 0, NULL);
808 fprintf(stderr, "Couldn't map data block %d\n", ret);
812 device = multi->stripes[0].dev;
814 if (device->fd == 0) {
816 "Device we need to read from is not open\n");
821 bytenr = multi->stripes[0].physical;
824 read_len = min(read_len, bytes_left);
825 done = pread64(fd, async->buffer+offset, read_len, bytenr);
826 if (done < read_len) {
828 fprintf(stderr, "Error reading extent %d\n",
831 fprintf(stderr, "Short read\n");
843 static int flush_pending(struct metadump_struct *md, int done)
845 struct async_work *async = NULL;
846 struct extent_buffer *eb;
847 u64 blocksize = md->root->nodesize;
853 if (md->pending_size) {
854 async = calloc(1, sizeof(*async));
858 async->start = md->pending_start;
859 async->size = md->pending_size;
860 async->bufsize = async->size;
861 async->buffer = malloc(async->bufsize);
862 if (!async->buffer) {
867 start = async->start;
871 ret = read_data_extent(md, async);
879 while (!md->data && size > 0) {
880 u64 this_read = min(blocksize, size);
881 eb = read_tree_block(md->root, start, this_read, 0);
886 "Error reading metadata block\n");
889 copy_buffer(md, async->buffer + offset, eb);
890 free_extent_buffer(eb);
896 md->pending_start = (u64)-1;
897 md->pending_size = 0;
902 pthread_mutex_lock(&md->mutex);
904 list_add_tail(&async->ordered, &md->ordered);
906 if (md->compress_level > 0) {
907 list_add_tail(&async->list, &md->list);
908 pthread_cond_signal(&md->cond);
913 if (md->num_items >= ITEMS_PER_CLUSTER || done) {
914 ret = write_buffers(md, &start);
916 fprintf(stderr, "Error writing buffers %d\n",
919 meta_cluster_init(md, start);
921 pthread_mutex_unlock(&md->mutex);
925 static int add_extent(u64 start, u64 size, struct metadump_struct *md,
929 if (md->data != data ||
930 md->pending_size + size > MAX_PENDING_SIZE ||
931 md->pending_start + md->pending_size != start) {
932 ret = flush_pending(md, 0);
935 md->pending_start = start;
937 readahead_tree_block(md->root, start, size, 0);
938 md->pending_size += size;
943 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
944 static int is_tree_block(struct btrfs_root *extent_root,
945 struct btrfs_path *path, u64 bytenr)
947 struct extent_buffer *leaf;
948 struct btrfs_key key;
952 leaf = path->nodes[0];
954 struct btrfs_extent_ref_v0 *ref_item;
956 if (path->slots[0] >= btrfs_header_nritems(leaf)) {
957 ret = btrfs_next_leaf(extent_root, path);
962 leaf = path->nodes[0];
964 btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
965 if (key.objectid != bytenr)
967 if (key.type != BTRFS_EXTENT_REF_V0_KEY)
969 ref_item = btrfs_item_ptr(leaf, path->slots[0],
970 struct btrfs_extent_ref_v0);
971 ref_objectid = btrfs_ref_objectid_v0(leaf, ref_item);
972 if (ref_objectid < BTRFS_FIRST_FREE_OBJECTID)
980 static int copy_tree_blocks(struct btrfs_root *root, struct extent_buffer *eb,
981 struct metadump_struct *metadump, int root_tree)
983 struct extent_buffer *tmp;
984 struct btrfs_root_item *ri;
985 struct btrfs_key key;
992 ret = add_extent(btrfs_header_bytenr(eb), root->leafsize, metadump, 0);
994 fprintf(stderr, "Error adding metadata block\n");
998 if (btrfs_header_level(eb) == 0 && !root_tree)
1001 level = btrfs_header_level(eb);
1002 nritems = btrfs_header_nritems(eb);
1003 for (i = 0; i < nritems; i++) {
1005 btrfs_item_key_to_cpu(eb, &key, i);
1006 if (key.type != BTRFS_ROOT_ITEM_KEY)
1008 ri = btrfs_item_ptr(eb, i, struct btrfs_root_item);
1009 bytenr = btrfs_disk_root_bytenr(eb, ri);
1010 tmp = read_tree_block(root, bytenr, root->leafsize, 0);
1013 "Error reading log root block\n");
1016 ret = copy_tree_blocks(root, tmp, metadump, 0);
1017 free_extent_buffer(tmp);
1021 bytenr = btrfs_node_blockptr(eb, i);
1022 tmp = read_tree_block(root, bytenr, root->leafsize, 0);
1024 fprintf(stderr, "Error reading log block\n");
1027 ret = copy_tree_blocks(root, tmp, metadump, root_tree);
1028 free_extent_buffer(tmp);
1037 static int copy_log_trees(struct btrfs_root *root,
1038 struct metadump_struct *metadump,
1039 struct btrfs_path *path)
1041 u64 blocknr = btrfs_super_log_root(root->fs_info->super_copy);
1046 if (!root->fs_info->log_root_tree ||
1047 !root->fs_info->log_root_tree->node) {
1048 fprintf(stderr, "Error copying tree log, it wasn't setup\n");
1052 return copy_tree_blocks(root, root->fs_info->log_root_tree->node,
1056 static int copy_space_cache(struct btrfs_root *root,
1057 struct metadump_struct *metadump,
1058 struct btrfs_path *path)
1060 struct extent_buffer *leaf;
1061 struct btrfs_file_extent_item *fi;
1062 struct btrfs_key key;
1063 u64 bytenr, num_bytes;
1066 root = root->fs_info->tree_root;
1069 key.type = BTRFS_EXTENT_DATA_KEY;
1072 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1074 fprintf(stderr, "Error searching for free space inode %d\n",
1080 leaf = path->nodes[0];
1081 if (path->slots[0] >= btrfs_header_nritems(leaf)) {
1082 ret = btrfs_next_leaf(root, path);
1084 fprintf(stderr, "Error going to next leaf "
1090 leaf = path->nodes[0];
1093 btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
1094 if (key.type != BTRFS_EXTENT_DATA_KEY) {
1099 fi = btrfs_item_ptr(leaf, path->slots[0],
1100 struct btrfs_file_extent_item);
1101 if (btrfs_file_extent_type(leaf, fi) !=
1102 BTRFS_FILE_EXTENT_REG) {
1107 bytenr = btrfs_file_extent_disk_bytenr(leaf, fi);
1108 num_bytes = btrfs_file_extent_disk_num_bytes(leaf, fi);
1109 ret = add_extent(bytenr, num_bytes, metadump, 1);
1111 fprintf(stderr, "Error adding space cache blocks %d\n",
1113 btrfs_release_path(root, path);
1122 static int copy_from_extent_tree(struct metadump_struct *metadump,
1123 struct btrfs_path *path)
1125 struct btrfs_root *extent_root;
1126 struct extent_buffer *leaf;
1127 struct btrfs_extent_item *ei;
1128 struct btrfs_key key;
1133 extent_root = metadump->root->fs_info->extent_root;
1134 bytenr = BTRFS_SUPER_INFO_OFFSET + 4096;
1135 key.objectid = bytenr;
1136 key.type = BTRFS_EXTENT_ITEM_KEY;
1139 ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0);
1141 fprintf(stderr, "Error searching extent root %d\n", ret);
1147 leaf = path->nodes[0];
1148 if (path->slots[0] >= btrfs_header_nritems(leaf)) {
1149 ret = btrfs_next_leaf(extent_root, path);
1151 fprintf(stderr, "Error going to next leaf %d"
1159 leaf = path->nodes[0];
1162 btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
1163 if (key.objectid < bytenr ||
1164 (key.type != BTRFS_EXTENT_ITEM_KEY &&
1165 key.type != BTRFS_METADATA_ITEM_KEY)) {
1170 bytenr = key.objectid;
1171 if (key.type == BTRFS_METADATA_ITEM_KEY)
1172 num_bytes = extent_root->leafsize;
1174 num_bytes = key.offset;
1176 if (btrfs_item_size_nr(leaf, path->slots[0]) > sizeof(*ei)) {
1177 ei = btrfs_item_ptr(leaf, path->slots[0],
1178 struct btrfs_extent_item);
1179 if (btrfs_extent_flags(leaf, ei) &
1180 BTRFS_EXTENT_FLAG_TREE_BLOCK) {
1181 ret = add_extent(bytenr, num_bytes, metadump,
1184 fprintf(stderr, "Error adding block "
1190 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
1191 ret = is_tree_block(extent_root, path, bytenr);
1193 fprintf(stderr, "Error checking tree block "
1199 ret = add_extent(bytenr, num_bytes, metadump,
1202 fprintf(stderr, "Error adding block "
1209 fprintf(stderr, "Either extent tree corruption or "
1210 "you haven't built with V0 support\n");
1215 bytenr += num_bytes;
1218 btrfs_release_path(extent_root, path);
1223 static int create_metadump(const char *input, FILE *out, int num_threads,
1224 int compress_level, int sanitize, int walk_trees)
1226 struct btrfs_root *root;
1227 struct btrfs_path *path = NULL;
1228 struct metadump_struct metadump;
1232 root = open_ctree(input, 0, 0);
1234 fprintf(stderr, "Open ctree failed\n");
1238 BUG_ON(root->nodesize != root->leafsize);
1240 ret = metadump_init(&metadump, root, out, num_threads,
1241 compress_level, sanitize);
1243 fprintf(stderr, "Error initing metadump %d\n", ret);
1248 ret = add_extent(BTRFS_SUPER_INFO_OFFSET, 4096, &metadump, 0);
1250 fprintf(stderr, "Error adding metadata %d\n", ret);
1255 path = btrfs_alloc_path();
1257 fprintf(stderr, "Out of memory allocing path\n");
1263 ret = copy_tree_blocks(root, root->fs_info->chunk_root->node,
1270 ret = copy_tree_blocks(root, root->fs_info->tree_root->node,
1277 ret = copy_from_extent_tree(&metadump, path);
1284 ret = copy_log_trees(root, &metadump, path);
1290 ret = copy_space_cache(root, &metadump, path);
1292 ret = flush_pending(&metadump, 1);
1296 fprintf(stderr, "Error flushing pending %d\n", ret);
1299 metadump_destroy(&metadump);
1301 btrfs_free_path(path);
1302 ret = close_ctree(root);
1303 return err ? err : ret;
1306 static void update_super_old(u8 *buffer)
1308 struct btrfs_super_block *super = (struct btrfs_super_block *)buffer;
1309 struct btrfs_chunk *chunk;
1310 struct btrfs_disk_key *key;
1311 u32 sectorsize = btrfs_super_sectorsize(super);
1312 u64 flags = btrfs_super_flags(super);
1314 flags |= BTRFS_SUPER_FLAG_METADUMP;
1315 btrfs_set_super_flags(super, flags);
1317 key = (struct btrfs_disk_key *)(super->sys_chunk_array);
1318 chunk = (struct btrfs_chunk *)(super->sys_chunk_array +
1319 sizeof(struct btrfs_disk_key));
1321 btrfs_set_disk_key_objectid(key, BTRFS_FIRST_CHUNK_TREE_OBJECTID);
1322 btrfs_set_disk_key_type(key, BTRFS_CHUNK_ITEM_KEY);
1323 btrfs_set_disk_key_offset(key, 0);
1325 btrfs_set_stack_chunk_length(chunk, (u64)-1);
1326 btrfs_set_stack_chunk_owner(chunk, BTRFS_EXTENT_TREE_OBJECTID);
1327 btrfs_set_stack_chunk_stripe_len(chunk, 64 * 1024);
1328 btrfs_set_stack_chunk_type(chunk, BTRFS_BLOCK_GROUP_SYSTEM);
1329 btrfs_set_stack_chunk_io_align(chunk, sectorsize);
1330 btrfs_set_stack_chunk_io_width(chunk, sectorsize);
1331 btrfs_set_stack_chunk_sector_size(chunk, sectorsize);
1332 btrfs_set_stack_chunk_num_stripes(chunk, 1);
1333 btrfs_set_stack_chunk_sub_stripes(chunk, 0);
1334 chunk->stripe.devid = super->dev_item.devid;
1335 chunk->stripe.offset = cpu_to_le64(0);
1336 memcpy(chunk->stripe.dev_uuid, super->dev_item.uuid, BTRFS_UUID_SIZE);
1337 btrfs_set_super_sys_array_size(super, sizeof(*key) + sizeof(*chunk));
1338 csum_block(buffer, 4096);
1341 static int update_super(u8 *buffer)
1343 struct btrfs_super_block *super = (struct btrfs_super_block *)buffer;
1344 struct btrfs_chunk *chunk;
1345 struct btrfs_disk_key *disk_key;
1346 struct btrfs_key key;
1347 u32 new_array_size = 0;
1351 u8 *ptr, *write_ptr;
1352 int old_num_stripes;
1354 write_ptr = ptr = super->sys_chunk_array;
1355 array_size = btrfs_super_sys_array_size(super);
1357 while (cur < array_size) {
1358 disk_key = (struct btrfs_disk_key *)ptr;
1359 btrfs_disk_key_to_cpu(&key, disk_key);
1361 new_array_size += sizeof(*disk_key);
1362 memmove(write_ptr, ptr, sizeof(*disk_key));
1364 write_ptr += sizeof(*disk_key);
1365 ptr += sizeof(*disk_key);
1366 cur += sizeof(*disk_key);
1367 new_cur += sizeof(*disk_key);
1369 if (key.type == BTRFS_CHUNK_ITEM_KEY) {
1370 chunk = (struct btrfs_chunk *)ptr;
1371 old_num_stripes = btrfs_stack_chunk_num_stripes(chunk);
1372 chunk = (struct btrfs_chunk *)write_ptr;
1374 memmove(write_ptr, ptr, sizeof(*chunk));
1375 btrfs_set_stack_chunk_num_stripes(chunk, 1);
1376 btrfs_set_stack_chunk_sub_stripes(chunk, 0);
1377 btrfs_set_stack_chunk_type(chunk,
1378 BTRFS_BLOCK_GROUP_SYSTEM);
1379 chunk->stripe.devid = super->dev_item.devid;
1380 memcpy(chunk->stripe.dev_uuid, super->dev_item.uuid,
1382 new_array_size += sizeof(*chunk);
1383 new_cur += sizeof(*chunk);
1385 fprintf(stderr, "Bogus key in the sys chunk array "
1389 write_ptr += sizeof(*chunk);
1390 ptr += btrfs_chunk_item_size(old_num_stripes);
1391 cur += btrfs_chunk_item_size(old_num_stripes);
1394 btrfs_set_super_sys_array_size(super, new_array_size);
1395 csum_block(buffer, 4096);
1400 static struct extent_buffer *alloc_dummy_eb(u64 bytenr, u32 size)
1402 struct extent_buffer *eb;
1404 eb = malloc(sizeof(struct extent_buffer) + size);
1407 memset(eb, 0, sizeof(struct extent_buffer) + size);
1414 static void truncate_item(struct extent_buffer *eb, int slot, u32 new_size)
1416 struct btrfs_item *item;
1424 old_size = btrfs_item_size_nr(eb, slot);
1425 if (old_size == new_size)
1428 nritems = btrfs_header_nritems(eb);
1429 data_end = btrfs_item_offset_nr(eb, nritems - 1);
1431 old_data_start = btrfs_item_offset_nr(eb, slot);
1432 size_diff = old_size - new_size;
1434 for (i = slot; i < nritems; i++) {
1436 item = btrfs_item_nr(eb, i);
1437 ioff = btrfs_item_offset(eb, item);
1438 btrfs_set_item_offset(eb, item, ioff + size_diff);
1441 memmove_extent_buffer(eb, btrfs_leaf_data(eb) + data_end + size_diff,
1442 btrfs_leaf_data(eb) + data_end,
1443 old_data_start + new_size - data_end);
1444 item = btrfs_item_nr(eb, slot);
1445 btrfs_set_item_size(eb, item, new_size);
1448 static int fixup_chunk_tree_block(struct mdrestore_struct *mdres,
1449 struct async_work *async, u8 *buffer,
1452 struct extent_buffer *eb;
1453 size_t size_left = size;
1454 u64 bytenr = async->start;
1457 if (size_left % mdres->leafsize)
1460 eb = alloc_dummy_eb(bytenr, mdres->leafsize);
1466 memcpy(eb->data, buffer, mdres->leafsize);
1468 if (btrfs_header_bytenr(eb) != bytenr)
1470 if (memcmp(mdres->fsid,
1471 eb->data + offsetof(struct btrfs_header, fsid),
1475 if (btrfs_header_owner(eb) != BTRFS_CHUNK_TREE_OBJECTID)
1478 if (btrfs_header_level(eb) != 0)
1481 for (i = 0; i < btrfs_header_nritems(eb); i++) {
1482 struct btrfs_chunk chunk;
1483 struct btrfs_key key;
1486 btrfs_item_key_to_cpu(eb, &key, i);
1487 if (key.type != BTRFS_CHUNK_ITEM_KEY)
1489 truncate_item(eb, i, sizeof(chunk));
1490 read_extent_buffer(eb, &chunk,
1491 btrfs_item_ptr_offset(eb, i),
1494 /* Zero out the RAID profile */
1495 type = btrfs_stack_chunk_type(&chunk);
1496 type &= (BTRFS_BLOCK_GROUP_DATA |
1497 BTRFS_BLOCK_GROUP_SYSTEM |
1498 BTRFS_BLOCK_GROUP_METADATA);
1499 btrfs_set_stack_chunk_type(&chunk, type);
1501 btrfs_set_stack_chunk_num_stripes(&chunk, 1);
1502 btrfs_set_stack_chunk_sub_stripes(&chunk, 0);
1503 btrfs_set_stack_stripe_devid(&chunk.stripe, mdres->devid);
1504 memcpy(chunk.stripe.dev_uuid, mdres->uuid,
1506 write_extent_buffer(eb, &chunk,
1507 btrfs_item_ptr_offset(eb, i),
1510 memcpy(buffer, eb->data, eb->len);
1511 csum_block(buffer, eb->len);
1513 size_left -= mdres->leafsize;
1514 buffer += mdres->leafsize;
1515 bytenr += mdres->leafsize;
1521 static void write_backup_supers(int fd, u8 *buf)
1523 struct btrfs_super_block *super = (struct btrfs_super_block *)buf;
1530 if (fstat(fd, &st)) {
1531 fprintf(stderr, "Couldn't stat restore point, won't be able "
1532 "to write backup supers: %d\n", errno);
1536 size = btrfs_device_size(fd, &st);
1538 for (i = 1; i < BTRFS_SUPER_MIRROR_MAX; i++) {
1539 bytenr = btrfs_sb_offset(i);
1540 if (bytenr + 4096 > size)
1542 btrfs_set_super_bytenr(super, bytenr);
1543 csum_block(buf, 4096);
1544 ret = pwrite64(fd, buf, 4096, bytenr);
1547 fprintf(stderr, "Problem writing out backup "
1548 "super block %d, err %d\n", i, errno);
1550 fprintf(stderr, "Short write writing out "
1551 "backup super block\n");
1557 static u64 logical_to_physical(struct mdrestore_struct *mdres, u64 logical, u64 *size)
1559 struct fs_chunk *fs_chunk;
1560 struct rb_node *entry;
1561 struct fs_chunk search;
1564 if (logical == BTRFS_SUPER_INFO_OFFSET)
1567 search.logical = logical;
1568 entry = tree_search(&mdres->chunk_tree, &search.n, chunk_cmp, 1);
1570 if (mdres->in != stdin)
1571 printf("Couldn't find a chunk, using logical\n");
1574 fs_chunk = rb_entry(entry, struct fs_chunk, n);
1575 if (fs_chunk->logical > logical || fs_chunk->logical + fs_chunk->bytes < logical)
1577 offset = search.logical - fs_chunk->logical;
1579 *size = min(*size, fs_chunk->bytes + fs_chunk->logical - logical);
1580 return fs_chunk->physical + offset;
1583 static void *restore_worker(void *data)
1585 struct mdrestore_struct *mdres = (struct mdrestore_struct *)data;
1586 struct async_work *async;
1593 outfd = fileno(mdres->out);
1594 buffer = malloc(MAX_PENDING_SIZE * 2);
1596 fprintf(stderr, "Error allocing buffer\n");
1597 pthread_mutex_lock(&mdres->mutex);
1599 mdres->error = -ENOMEM;
1600 pthread_mutex_unlock(&mdres->mutex);
1609 pthread_mutex_lock(&mdres->mutex);
1610 while (!mdres->leafsize || list_empty(&mdres->list)) {
1612 pthread_mutex_unlock(&mdres->mutex);
1615 pthread_cond_wait(&mdres->cond, &mdres->mutex);
1617 async = list_entry(mdres->list.next, struct async_work, list);
1618 list_del_init(&async->list);
1619 pthread_mutex_unlock(&mdres->mutex);
1621 if (mdres->compress_method == COMPRESS_ZLIB) {
1622 size = MAX_PENDING_SIZE * 2;
1623 ret = uncompress(buffer, (unsigned long *)&size,
1624 async->buffer, async->bufsize);
1626 fprintf(stderr, "Error decompressing %d\n",
1632 outbuf = async->buffer;
1633 size = async->bufsize;
1636 if (async->start == BTRFS_SUPER_INFO_OFFSET) {
1637 if (mdres->old_restore) {
1638 update_super_old(outbuf);
1640 ret = update_super(outbuf);
1644 } else if (!mdres->old_restore) {
1645 ret = fixup_chunk_tree_block(mdres, async, outbuf, size);
1651 u64 chunk_size = size;
1652 bytenr = logical_to_physical(mdres,
1653 async->start + offset,
1655 ret = pwrite64(outfd, outbuf+offset, chunk_size,
1657 if (ret < chunk_size) {
1659 fprintf(stderr, "Error writing to "
1660 "device %d\n", errno);
1664 fprintf(stderr, "Short write\n");
1670 offset += chunk_size;
1673 if (async->start == BTRFS_SUPER_INFO_OFFSET)
1674 write_backup_supers(outfd, outbuf);
1676 pthread_mutex_lock(&mdres->mutex);
1677 if (err && !mdres->error)
1680 pthread_mutex_unlock(&mdres->mutex);
1682 free(async->buffer);
1690 static void mdrestore_destroy(struct mdrestore_struct *mdres)
1695 while ((n = rb_first(&mdres->chunk_tree))) {
1696 struct fs_chunk *entry;
1698 entry = rb_entry(n, struct fs_chunk, n);
1699 rb_erase(n, &mdres->chunk_tree);
1702 pthread_mutex_lock(&mdres->mutex);
1704 pthread_cond_broadcast(&mdres->cond);
1705 pthread_mutex_unlock(&mdres->mutex);
1707 for (i = 0; i < mdres->num_threads; i++)
1708 pthread_join(mdres->threads[i], NULL);
1710 pthread_cond_destroy(&mdres->cond);
1711 pthread_mutex_destroy(&mdres->mutex);
1712 free(mdres->threads);
1715 static int mdrestore_init(struct mdrestore_struct *mdres,
1716 FILE *in, FILE *out, int old_restore,
1721 memset(mdres, 0, sizeof(*mdres));
1722 pthread_cond_init(&mdres->cond, NULL);
1723 pthread_mutex_init(&mdres->mutex, NULL);
1724 INIT_LIST_HEAD(&mdres->list);
1727 mdres->old_restore = old_restore;
1728 mdres->chunk_tree.rb_node = NULL;
1733 mdres->num_threads = num_threads;
1734 mdres->threads = calloc(num_threads, sizeof(pthread_t));
1735 if (!mdres->threads)
1737 for (i = 0; i < num_threads; i++) {
1738 ret = pthread_create(mdres->threads + i, NULL, restore_worker,
1744 mdrestore_destroy(mdres);
1748 static int fill_mdres_info(struct mdrestore_struct *mdres,
1749 struct async_work *async)
1751 struct btrfs_super_block *super;
1756 /* We've already been initialized */
1757 if (mdres->leafsize)
1760 if (mdres->compress_method == COMPRESS_ZLIB) {
1761 size_t size = MAX_PENDING_SIZE * 2;
1763 buffer = malloc(MAX_PENDING_SIZE * 2);
1766 ret = uncompress(buffer, (unsigned long *)&size,
1767 async->buffer, async->bufsize);
1769 fprintf(stderr, "Error decompressing %d\n", ret);
1775 outbuf = async->buffer;
1778 super = (struct btrfs_super_block *)outbuf;
1779 mdres->leafsize = btrfs_super_leafsize(super);
1780 memcpy(mdres->fsid, super->fsid, BTRFS_FSID_SIZE);
1781 memcpy(mdres->uuid, super->dev_item.uuid,
1783 mdres->devid = le64_to_cpu(super->dev_item.devid);
1788 static int add_cluster(struct meta_cluster *cluster,
1789 struct mdrestore_struct *mdres, u64 *next)
1791 struct meta_cluster_item *item;
1792 struct meta_cluster_header *header = &cluster->header;
1793 struct async_work *async;
1798 BUG_ON(mdres->num_items);
1799 mdres->compress_method = header->compress;
1801 bytenr = le64_to_cpu(header->bytenr) + BLOCK_SIZE;
1802 nritems = le32_to_cpu(header->nritems);
1803 for (i = 0; i < nritems; i++) {
1804 item = &cluster->items[i];
1805 async = calloc(1, sizeof(*async));
1807 fprintf(stderr, "Error allocating async\n");
1810 async->start = le64_to_cpu(item->bytenr);
1811 async->bufsize = le32_to_cpu(item->size);
1812 async->buffer = malloc(async->bufsize);
1813 if (!async->buffer) {
1814 fprintf(stderr, "Error allocing async buffer\n");
1818 ret = fread(async->buffer, async->bufsize, 1, mdres->in);
1820 fprintf(stderr, "Error reading buffer %d\n", errno);
1821 free(async->buffer);
1825 bytenr += async->bufsize;
1827 pthread_mutex_lock(&mdres->mutex);
1828 if (async->start == BTRFS_SUPER_INFO_OFFSET) {
1829 ret = fill_mdres_info(mdres, async);
1831 fprintf(stderr, "Error setting up restore\n");
1832 pthread_mutex_unlock(&mdres->mutex);
1833 free(async->buffer);
1838 list_add_tail(&async->list, &mdres->list);
1840 pthread_cond_signal(&mdres->cond);
1841 pthread_mutex_unlock(&mdres->mutex);
1843 if (bytenr & BLOCK_MASK) {
1844 char buffer[BLOCK_MASK];
1845 size_t size = BLOCK_SIZE - (bytenr & BLOCK_MASK);
1848 ret = fread(buffer, size, 1, mdres->in);
1850 fprintf(stderr, "Error reading in buffer %d\n", errno);
1858 static int wait_for_worker(struct mdrestore_struct *mdres)
1862 pthread_mutex_lock(&mdres->mutex);
1864 while (!ret && mdres->num_items > 0) {
1865 struct timespec ts = {
1867 .tv_nsec = 10000000,
1869 pthread_mutex_unlock(&mdres->mutex);
1870 nanosleep(&ts, NULL);
1871 pthread_mutex_lock(&mdres->mutex);
1874 pthread_mutex_unlock(&mdres->mutex);
1878 static int read_chunk_block(struct mdrestore_struct *mdres, u8 *buffer,
1879 u64 bytenr, u64 item_bytenr, u32 bufsize,
1882 struct extent_buffer *eb;
1886 eb = alloc_dummy_eb(bytenr, mdres->leafsize);
1892 while (item_bytenr != bytenr) {
1893 buffer += mdres->leafsize;
1894 item_bytenr += mdres->leafsize;
1897 memcpy(eb->data, buffer, mdres->leafsize);
1898 if (btrfs_header_bytenr(eb) != bytenr) {
1899 fprintf(stderr, "Eb bytenr doesn't match found bytenr\n");
1904 if (memcmp(mdres->fsid, eb->data + offsetof(struct btrfs_header, fsid),
1906 fprintf(stderr, "Fsid doesn't match\n");
1911 if (btrfs_header_owner(eb) != BTRFS_CHUNK_TREE_OBJECTID) {
1912 fprintf(stderr, "Does not belong to the chunk tree\n");
1917 for (i = 0; i < btrfs_header_nritems(eb); i++) {
1918 struct btrfs_chunk chunk;
1919 struct fs_chunk *fs_chunk;
1920 struct btrfs_key key;
1922 if (btrfs_header_level(eb)) {
1923 u64 blockptr = btrfs_node_blockptr(eb, i);
1925 ret = search_for_chunk_blocks(mdres, blockptr,
1932 /* Yay a leaf! We loves leafs! */
1933 btrfs_item_key_to_cpu(eb, &key, i);
1934 if (key.type != BTRFS_CHUNK_ITEM_KEY)
1937 fs_chunk = malloc(sizeof(struct fs_chunk));
1939 fprintf(stderr, "Erorr allocating chunk\n");
1943 memset(fs_chunk, 0, sizeof(*fs_chunk));
1944 read_extent_buffer(eb, &chunk, btrfs_item_ptr_offset(eb, i),
1947 fs_chunk->logical = key.offset;
1948 fs_chunk->physical = btrfs_stack_stripe_offset(&chunk.stripe);
1949 fs_chunk->bytes = btrfs_stack_chunk_length(&chunk);
1950 tree_insert(&mdres->chunk_tree, &fs_chunk->n, chunk_cmp);
1957 /* If you have to ask you aren't worthy */
1958 static int search_for_chunk_blocks(struct mdrestore_struct *mdres,
1959 u64 search, u64 cluster_bytenr)
1961 struct meta_cluster *cluster;
1962 struct meta_cluster_header *header;
1963 struct meta_cluster_item *item;
1964 u64 current_cluster = cluster_bytenr, bytenr;
1966 u32 bufsize, nritems, i;
1967 u8 *buffer, *tmp = NULL;
1970 cluster = malloc(BLOCK_SIZE);
1972 fprintf(stderr, "Error allocating cluster\n");
1976 buffer = malloc(MAX_PENDING_SIZE * 2);
1978 fprintf(stderr, "Error allocing buffer\n");
1983 if (mdres->compress_method == COMPRESS_ZLIB) {
1984 tmp = malloc(MAX_PENDING_SIZE * 2);
1986 fprintf(stderr, "Error allocing tmp buffer\n");
1993 bytenr = current_cluster;
1995 if (fseek(mdres->in, current_cluster, SEEK_SET)) {
1996 fprintf(stderr, "Error seeking: %d\n", errno);
2001 ret = fread(cluster, BLOCK_SIZE, 1, mdres->in);
2003 if (cluster_bytenr != 0) {
2005 current_cluster = 0;
2009 printf("ok this is where we screwed up?\n");
2012 } else if (ret < 0) {
2013 fprintf(stderr, "Error reading image\n");
2018 header = &cluster->header;
2019 if (le64_to_cpu(header->magic) != HEADER_MAGIC ||
2020 le64_to_cpu(header->bytenr) != current_cluster) {
2021 fprintf(stderr, "bad header in metadump image\n");
2026 bytenr += BLOCK_SIZE;
2027 nritems = le32_to_cpu(header->nritems);
2028 for (i = 0; i < nritems; i++) {
2031 item = &cluster->items[i];
2032 bufsize = le32_to_cpu(item->size);
2033 item_bytenr = le64_to_cpu(item->bytenr);
2035 if (mdres->compress_method == COMPRESS_ZLIB) {
2036 ret = fread(tmp, bufsize, 1, mdres->in);
2038 fprintf(stderr, "Error reading: %d\n",
2044 size = MAX_PENDING_SIZE * 2;
2045 ret = uncompress(buffer,
2046 (unsigned long *)&size, tmp,
2049 fprintf(stderr, "Error decompressing "
2055 ret = fread(buffer, bufsize, 1, mdres->in);
2057 fprintf(stderr, "Error reading: %d\n",
2066 if (item_bytenr <= search &&
2067 item_bytenr + size > search) {
2068 ret = read_chunk_block(mdres, buffer, search,
2082 if (bytenr & BLOCK_MASK)
2083 bytenr += BLOCK_SIZE - (bytenr & BLOCK_MASK);
2084 current_cluster = bytenr;
2093 static int build_chunk_tree(struct mdrestore_struct *mdres,
2094 struct meta_cluster *cluster)
2096 struct btrfs_super_block *super;
2097 struct meta_cluster_header *header;
2098 struct meta_cluster_item *item = NULL;
2099 u64 chunk_root_bytenr = 0;
2105 /* We can't seek with stdin so don't bother doing this */
2106 if (mdres->in == stdin)
2109 ret = fread(cluster, BLOCK_SIZE, 1, mdres->in);
2111 fprintf(stderr, "Error reading in cluster: %d\n", errno);
2116 header = &cluster->header;
2117 if (le64_to_cpu(header->magic) != HEADER_MAGIC ||
2118 le64_to_cpu(header->bytenr) != 0) {
2119 fprintf(stderr, "bad header in metadump image\n");
2123 bytenr += BLOCK_SIZE;
2124 mdres->compress_method = header->compress;
2125 nritems = le32_to_cpu(header->nritems);
2126 for (i = 0; i < nritems; i++) {
2127 item = &cluster->items[i];
2129 if (le64_to_cpu(item->bytenr) == BTRFS_SUPER_INFO_OFFSET)
2131 bytenr += le32_to_cpu(item->size);
2132 if (fseek(mdres->in, le32_to_cpu(item->size), SEEK_CUR)) {
2133 fprintf(stderr, "Error seeking: %d\n", errno);
2138 if (!item || le64_to_cpu(item->bytenr) != BTRFS_SUPER_INFO_OFFSET) {
2139 fprintf(stderr, "Huh, didn't find the super?\n");
2143 buffer = malloc(le32_to_cpu(item->size));
2145 fprintf(stderr, "Error allocing buffer\n");
2149 ret = fread(buffer, le32_to_cpu(item->size), 1, mdres->in);
2151 fprintf(stderr, "Error reading buffer: %d\n", errno);
2156 if (mdres->compress_method == COMPRESS_ZLIB) {
2157 size_t size = MAX_PENDING_SIZE * 2;
2160 tmp = malloc(MAX_PENDING_SIZE * 2);
2165 ret = uncompress(tmp, (unsigned long *)&size,
2166 buffer, le32_to_cpu(item->size));
2168 fprintf(stderr, "Error decompressing %d\n", ret);
2177 super = (struct btrfs_super_block *)buffer;
2178 chunk_root_bytenr = btrfs_super_chunk_root(super);
2179 mdres->leafsize = btrfs_super_leafsize(super);
2180 memcpy(mdres->fsid, super->fsid, BTRFS_FSID_SIZE);
2181 memcpy(mdres->uuid, super->dev_item.uuid,
2183 mdres->devid = le64_to_cpu(super->dev_item.devid);
2186 return search_for_chunk_blocks(mdres, chunk_root_bytenr, 0);
2189 static int restore_metadump(const char *input, FILE *out, int old_restore,
2192 struct meta_cluster *cluster = NULL;
2193 struct meta_cluster_header *header;
2194 struct mdrestore_struct mdrestore;
2199 if (!strcmp(input, "-")) {
2202 in = fopen(input, "r");
2204 perror("unable to open metadump image");
2209 cluster = malloc(BLOCK_SIZE);
2211 fprintf(stderr, "Error allocating cluster\n");
2217 ret = mdrestore_init(&mdrestore, in, out, old_restore, num_threads);
2219 fprintf(stderr, "Error initing mdrestore %d\n", ret);
2226 ret = build_chunk_tree(&mdrestore, cluster);
2230 if (in != stdin && fseek(in, 0, SEEK_SET)) {
2231 fprintf(stderr, "Error seeking %d\n", errno);
2236 ret = fread(cluster, BLOCK_SIZE, 1, in);
2240 header = &cluster->header;
2241 if (le64_to_cpu(header->magic) != HEADER_MAGIC ||
2242 le64_to_cpu(header->bytenr) != bytenr) {
2243 fprintf(stderr, "bad header in metadump image\n");
2247 ret = add_cluster(cluster, &mdrestore, &bytenr);
2249 fprintf(stderr, "Error adding cluster\n");
2253 ret = wait_for_worker(&mdrestore);
2255 fprintf(stderr, "One of the threads errored out %d\n",
2261 mdrestore_destroy(&mdrestore);
2268 static void print_usage(void)
2270 fprintf(stderr, "usage: btrfs-image [options] source target\n");
2271 fprintf(stderr, "\t-r \trestore metadump image\n");
2272 fprintf(stderr, "\t-c value\tcompression level (0 ~ 9)\n");
2273 fprintf(stderr, "\t-t value\tnumber of threads (1 ~ 32)\n");
2274 fprintf(stderr, "\t-o \tdon't mess with the chunk tree when restoring\n");
2275 fprintf(stderr, "\t-s \tsanitize file names, use once to just use garbage, use twice if you want crc collisions\n");
2276 fprintf(stderr, "\t-w \twalk all trees instead of using extent tree, do this if your extent tree is broken\n");
2280 int main(int argc, char *argv[])
2284 int num_threads = 0;
2285 int compress_level = 0;
2287 int old_restore = 0;
2294 int c = getopt(argc, argv, "rc:t:osw");
2302 num_threads = atoi(optarg);
2303 if (num_threads <= 0 || num_threads > 32)
2307 compress_level = atoi(optarg);
2308 if (compress_level < 0 || compress_level > 9)
2325 if (old_restore && create)
2328 argc = argc - optind;
2331 source = argv[optind];
2332 target = argv[optind + 1];
2334 if (create && !strcmp(target, "-")) {
2337 out = fopen(target, "w+");
2339 perror("unable to create target file");
2344 if (num_threads == 0 && compress_level > 0) {
2345 num_threads = sysconf(_SC_NPROCESSORS_ONLN);
2346 if (num_threads <= 0)
2351 ret = create_metadump(source, out, num_threads,
2352 compress_level, sanitize, walk_trees);
2354 ret = restore_metadump(source, out, old_restore, 1);