?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Fix mispatch of the experimental warnings
[btrfs-progs-unstable/devel.git] / btrfs-image.c
blob9925bdbc46c75bb4ee192199dba368164812e56a
1 /*
2 * Copyright (C) 2008 Oracle. All rights reserved.
3 *
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.
7 *
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.
12 *
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.
17 */
18
19 #define _XOPEN_SOURCE 500
20 #define _GNU_SOURCE 1
21 #include <pthread.h>
22 #include <stdio.h>
23 #include <stdlib.h>
24 #include <sys/types.h>
25 #include <sys/stat.h>
26 #include <fcntl.h>
27 #include <unistd.h>
28 #include <dirent.h>
29 #include <zlib.h>
30 #include "kerncompat.h"
31 #include "crc32c.h"
32 #include "ctree.h"
33 #include "disk-io.h"
34 #include "transaction.h"
35 #include "utils.h"
36 #include "version.h"
37
38
39 #define HEADER_MAGIC 0xbd5c25e27295668bULL
40 #define MAX_PENDING_SIZE (256 * 1024)
41 #define BLOCK_SIZE 1024
42 #define BLOCK_MASK (BLOCK_SIZE - 1)
43
44 #define COMPRESS_NONE 0
45 #define COMPRESS_ZLIB 1
46
47 struct meta_cluster_item {
48 __le64 bytenr;
49 __le32 size;
50 } __attribute__ ((__packed__));
51
52 struct meta_cluster_header {
53 __le64 magic;
54 __le64 bytenr;
55 __le32 nritems;
56 u8 compress;
57 } __attribute__ ((__packed__));
58
59 /* cluster header + index items + buffers */
60 struct meta_cluster {
61 struct meta_cluster_header header;
62 struct meta_cluster_item items[];
63 } __attribute__ ((__packed__));
64
65 #define ITEMS_PER_CLUSTER ((BLOCK_SIZE - sizeof(struct meta_cluster)) / \
66 sizeof(struct meta_cluster_item))
67
68 struct async_work {
69 struct list_head list;
70 struct list_head ordered;
71 u64 start;
72 u64 size;
73 u8 *buffer;
74 size_t bufsize;
75 };
76
77 struct metadump_struct {
78 struct btrfs_root *root;
79 FILE *out;
80
81 struct meta_cluster *cluster;
82
83 pthread_t *threads;
84 size_t num_threads;
85 pthread_mutex_t mutex;
86 pthread_cond_t cond;
87
88 struct list_head list;
89 struct list_head ordered;
90 size_t num_items;
91 size_t num_ready;
92
93 u64 pending_start;
94 u64 pending_size;
95
96 int compress_level;
97 int done;
98 };
99
100 struct mdrestore_struct {
101 FILE *in;
102 FILE *out;
103
104 pthread_t *threads;
105 size_t num_threads;
106 pthread_mutex_t mutex;
107 pthread_cond_t cond;
108
109 struct list_head list;
110 size_t num_items;
111
112 int compress_method;
113 int done;
114 };
115
116 static void csum_block(u8 *buf, size_t len)
117 {
118 char result[BTRFS_CRC32_SIZE];
119 u32 crc = ~(u32)0;
120 crc = crc32c(crc, buf + BTRFS_CSUM_SIZE, len - BTRFS_CSUM_SIZE);
121 btrfs_csum_final(crc, result);
122 memcpy(buf, result, BTRFS_CRC32_SIZE);
123 }
124
125 /*
126 * zero inline extents and csum items
127 */
128 static void zero_items(u8 *dst, struct extent_buffer *src)
129 {
130 struct btrfs_file_extent_item *fi;
131 struct btrfs_item *item;
132 struct btrfs_key key;
133 u32 nritems = btrfs_header_nritems(src);
134 size_t size;
135 unsigned long ptr;
136 int i, extent_type;
137
138 for (i = 0; i < nritems; i++) {
139 item = btrfs_item_nr(src, i);
140 btrfs_item_key_to_cpu(src, &key, i);
141 if (key.type == BTRFS_CSUM_ITEM_KEY) {
142 size = btrfs_item_size_nr(src, i);
143 memset(dst + btrfs_leaf_data(src) +
144 btrfs_item_offset_nr(src, i), 0, size);
145 continue;
146 }
147 if (key.type != BTRFS_EXTENT_DATA_KEY)
148 continue;
149
150 fi = btrfs_item_ptr(src, i, struct btrfs_file_extent_item);
151 extent_type = btrfs_file_extent_type(src, fi);
152 if (extent_type != BTRFS_FILE_EXTENT_INLINE)
153 continue;
154
155 ptr = btrfs_file_extent_inline_start(fi);
156 size = btrfs_file_extent_inline_item_len(src, item);
157 memset(dst + ptr, 0, size);
158 }
159 }
160
161 /*
162 * copy buffer and zero useless data in the buffer
163 */
164 static void copy_buffer(u8 *dst, struct extent_buffer *src)
165 {
166 int level;
167 size_t size;
168 u32 nritems;
169
170 memcpy(dst, src->data, src->len);
171 if (src->start == BTRFS_SUPER_INFO_OFFSET)
172 return;
173
174 level = btrfs_header_level(src);
175 nritems = btrfs_header_nritems(src);
176
177 if (nritems == 0) {
178 size = sizeof(struct btrfs_header);
179 memset(dst + size, 0, src->len - size);
180 } else if (level == 0) {
181 size = btrfs_leaf_data(src) +
182 btrfs_item_offset_nr(src, nritems - 1) -
183 btrfs_item_nr_offset(nritems);
184 memset(dst + btrfs_item_nr_offset(nritems), 0, size);
185 zero_items(dst, src);
186 } else {
187 size = offsetof(struct btrfs_node, ptrs) +
188 sizeof(struct btrfs_key_ptr) * nritems;
189 memset(dst + size, 0, src->len - size);
190 }
191 csum_block(dst, src->len);
192 }
193
194 static void *dump_worker(void *data)
195 {
196 struct metadump_struct *md = (struct metadump_struct *)data;
197 struct async_work *async;
198 int ret;
199
200 while (1) {
201 pthread_mutex_lock(&md->mutex);
202 while (list_empty(&md->list)) {
203 if (md->done) {
204 pthread_mutex_unlock(&md->mutex);
205 goto out;
206 }
207 pthread_cond_wait(&md->cond, &md->mutex);
208 }
209 async = list_entry(md->list.next, struct async_work, list);
210 list_del_init(&async->list);
211 pthread_mutex_unlock(&md->mutex);
212
213 if (md->compress_level > 0) {
214 u8 *orig = async->buffer;
215
216 async->bufsize = compressBound(async->size);
217 async->buffer = malloc(async->bufsize);
218
219 ret = compress2(async->buffer,
220 (unsigned long *)&async->bufsize,
221 orig, async->size, md->compress_level);
222 BUG_ON(ret != Z_OK);
223
224 free(orig);
225 }
226
227 pthread_mutex_lock(&md->mutex);
228 md->num_ready++;
229 pthread_mutex_unlock(&md->mutex);
230 }
231 out:
232 pthread_exit(NULL);
233 }
234
235 static void meta_cluster_init(struct metadump_struct *md, u64 start)
236 {
237 struct meta_cluster_header *header;
238
239 md->num_items = 0;
240 md->num_ready = 0;
241 header = &md->cluster->header;
242 header->magic = cpu_to_le64(HEADER_MAGIC);
243 header->bytenr = cpu_to_le64(start);
244 header->nritems = cpu_to_le32(0);
245 header->compress = md->compress_level > 0 ?
246 COMPRESS_ZLIB : COMPRESS_NONE;
247 }
248
249 static int metadump_init(struct metadump_struct *md, struct btrfs_root *root,
250 FILE *out, int num_threads, int compress_level)
251 {
252 int i, ret;
253
254 memset(md, 0, sizeof(*md));
255 pthread_cond_init(&md->cond, NULL);
256 pthread_mutex_init(&md->mutex, NULL);
257 INIT_LIST_HEAD(&md->list);
258 INIT_LIST_HEAD(&md->ordered);
259 md->root = root;
260 md->out = out;
261 md->pending_start = (u64)-1;
262 md->compress_level = compress_level;
263 md->cluster = calloc(1, BLOCK_SIZE);
264 if (!md->cluster)
265 return -ENOMEM;
266
267 meta_cluster_init(md, 0);
268 if (!num_threads)
269 return 0;
270
271 md->num_threads = num_threads;
272 md->threads = calloc(num_threads, sizeof(pthread_t));
273 if (!md->threads)
274 return -ENOMEM;
275 for (i = 0; i < num_threads; i++) {
276 ret = pthread_create(md->threads + i, NULL, dump_worker, md);
277 if (ret)
278 break;
279 }
280 return ret;
281 }
282
283 static void metadump_destroy(struct metadump_struct *md)
284 {
285 int i;
286 pthread_mutex_lock(&md->mutex);
287 md->done = 1;
288 pthread_cond_broadcast(&md->cond);
289 pthread_mutex_unlock(&md->mutex);
290
291 for (i = 0; i < md->num_threads; i++)
292 pthread_join(md->threads[i], NULL);
293
294 pthread_cond_destroy(&md->cond);
295 pthread_mutex_destroy(&md->mutex);
296 free(md->threads);
297 free(md->cluster);
298 }
299
300 static int write_zero(FILE *out, size_t size)
301 {
302 static char zero[BLOCK_SIZE];
303 return fwrite(zero, size, 1, out);
304 }
305
306 static int write_buffers(struct metadump_struct *md, u64 *next)
307 {
308 struct meta_cluster_header *header = &md->cluster->header;
309 struct meta_cluster_item *item;
310 struct async_work *async;
311 u64 bytenr = 0;
312 u32 nritems = 0;
313 int ret;
314
315 if (list_empty(&md->ordered))
316 goto out;
317
318 /* wait until all buffers are compressed */
319 while (md->num_items > md->num_ready) {
320 struct timespec ts = {
321 .tv_sec = 0,
322 .tv_nsec = 10000000,
323 };
324 pthread_mutex_unlock(&md->mutex);
325 nanosleep(&ts, NULL);
326 pthread_mutex_lock(&md->mutex);
327 }
328
329 /* setup and write index block */
330 list_for_each_entry(async, &md->ordered, ordered) {
331 item = md->cluster->items + nritems;
332 item->bytenr = cpu_to_le64(async->start);
333 item->size = cpu_to_le32(async->bufsize);
334 nritems++;
335 }
336 header->nritems = cpu_to_le32(nritems);
337
338 ret = fwrite(md->cluster, BLOCK_SIZE, 1, md->out);
339 BUG_ON(ret != 1);
340
341 /* write buffers */
342 bytenr += le64_to_cpu(header->bytenr) + BLOCK_SIZE;
343 while (!list_empty(&md->ordered)) {
344 async = list_entry(md->ordered.next, struct async_work,
345 ordered);
346 list_del_init(&async->ordered);
347
348 bytenr += async->bufsize;
349 ret = fwrite(async->buffer, async->bufsize, 1, md->out);
350 BUG_ON(ret != 1);
351
352 free(async->buffer);
353 free(async);
354 }
355
356 /* zero unused space in the last block */
357 if (bytenr & BLOCK_MASK) {
358 size_t size = BLOCK_SIZE - (bytenr & BLOCK_MASK);
359
360 bytenr += size;
361 ret = write_zero(md->out, size);
362 BUG_ON(ret != 1);
363 }
364 out:
365 *next = bytenr;
366 return 0;
367 }
368
369 static int flush_pending(struct metadump_struct *md, int done)
370 {
371 struct async_work *async = NULL;
372 struct extent_buffer *eb;
373 u64 blocksize = md->root->nodesize;
374 u64 start;
375 u64 size;
376 size_t offset;
377 int ret;
378
379 if (md->pending_size) {
380 async = calloc(1, sizeof(*async));
381 if (!async)
382 return -ENOMEM;
383
384 async->start = md->pending_start;
385 async->size = md->pending_size;
386 async->bufsize = async->size;
387 async->buffer = malloc(async->bufsize);
388
389 offset = 0;
390 start = async->start;
391 size = async->size;
392 while (size > 0) {
393 eb = read_tree_block(md->root, start, blocksize, 0);
394 BUG_ON(!eb);
395 copy_buffer(async->buffer + offset, eb);
396 free_extent_buffer(eb);
397 start += blocksize;
398 offset += blocksize;
399 size -= blocksize;
400 }
401
402 md->pending_start = (u64)-1;
403 md->pending_size = 0;
404 } else if (!done) {
405 return 0;
406 }
407
408 pthread_mutex_lock(&md->mutex);
409 if (async) {
410 list_add_tail(&async->ordered, &md->ordered);
411 md->num_items++;
412 if (md->compress_level > 0) {
413 list_add_tail(&async->list, &md->list);
414 pthread_cond_signal(&md->cond);
415 } else {
416 md->num_ready++;
417 }
418 }
419 if (md->num_items >= ITEMS_PER_CLUSTER || done) {
420 ret = write_buffers(md, &start);
421 BUG_ON(ret);
422 meta_cluster_init(md, start);
423 }
424 pthread_mutex_unlock(&md->mutex);
425 return 0;
426 }
427
428 static int add_metadata(u64 start, u64 size, struct metadump_struct *md)
429 {
430 int ret;
431 if (md->pending_size + size > MAX_PENDING_SIZE ||
432 md->pending_start + md->pending_size != start) {
433 ret = flush_pending(md, 0);
434 if (ret)
435 return ret;
436 md->pending_start = start;
437 }
438 readahead_tree_block(md->root, start, size, 0);
439 md->pending_size += size;
440 return 0;
441 }
442
443 static int create_metadump(const char *input, FILE *out, int num_threads,
444 int compress_level)
445 {
446 struct btrfs_root *root;
447 struct btrfs_root *extent_root;
448 struct btrfs_path *path;
449 struct extent_buffer *leaf;
450 struct btrfs_extent_ref *ref_item;
451 struct btrfs_key key;
452 struct metadump_struct metadump;
453 u64 bytenr;
454 u64 num_bytes;
455 u64 ref_objectid;
456 int ret;
457
458 root = open_ctree(input, 0, 0);
459 BUG_ON(root->nodesize != root->leafsize);
460
461 ret = metadump_init(&metadump, root, out, num_threads,
462 compress_level);
463 BUG_ON(ret);
464
465 ret = add_metadata(BTRFS_SUPER_INFO_OFFSET, 4096, &metadump);
466 BUG_ON(ret);
467
468 extent_root = root->fs_info->extent_root;
469 path = btrfs_alloc_path();
470
471 bytenr = BTRFS_SUPER_INFO_OFFSET + 4096;
472 key.objectid = bytenr;
473 key.type = BTRFS_EXTENT_ITEM_KEY;
474 key.offset = 0;
475
476 ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0);
477 BUG_ON(ret < 0);
478
479 while (1) {
480 leaf = path->nodes[0];
481 if (path->slots[0] >= btrfs_header_nritems(leaf)) {
482 ret = btrfs_next_leaf(extent_root, path);
483 BUG_ON(ret < 0);
484 if (ret > 0)
485 break;
486 leaf = path->nodes[0];
487 }
488
489 btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
490 if (key.objectid < bytenr ||
491 key.type != BTRFS_EXTENT_ITEM_KEY) {
492 path->slots[0]++;
493 continue;
494 }
495
496 bytenr = key.objectid;
497 num_bytes = key.offset;
498 while (1) {
499 path->slots[0]++;
500 if (path->slots[0] >= btrfs_header_nritems(leaf)) {
501 ret = btrfs_next_leaf(extent_root, path);
502 BUG_ON(ret < 0);
503 if (ret > 0)
504 break;
505 leaf = path->nodes[0];
506 }
507 btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
508 if (key.objectid != bytenr)
509 break;
510 if (key.type != BTRFS_EXTENT_REF_KEY)
511 continue;
512 ref_item = btrfs_item_ptr(leaf, path->slots[0],
513 struct btrfs_extent_ref);
514 ref_objectid = btrfs_ref_objectid(leaf, ref_item);
515 if (ref_objectid < BTRFS_FIRST_FREE_OBJECTID) {
516 ret = add_metadata(bytenr, num_bytes,
517 &metadump);
518 BUG_ON(ret);
519 break;
520 }
521 }
522 bytenr += num_bytes;
523 }
524
525 ret = flush_pending(&metadump, 1);
526 BUG_ON(ret);
527
528 metadump_destroy(&metadump);
529
530 btrfs_free_path(path);
531 ret = close_ctree(root);
532 return 0;
533 }
534
535 static void update_super(u8 *buffer)
536 {
537 struct btrfs_super_block *super = (struct btrfs_super_block *)buffer;
538 struct btrfs_chunk *chunk;
539 struct btrfs_disk_key *key;
540 u32 sectorsize = btrfs_super_sectorsize(super);
541 u64 flags = btrfs_super_flags(super);
542
543 flags |= BTRFS_SUPER_FLAG_METADUMP;
544 btrfs_set_super_flags(super, flags);
545
546 key = (struct btrfs_disk_key *)(super->sys_chunk_array);
547 chunk = (struct btrfs_chunk *)(super->sys_chunk_array +
548 sizeof(struct btrfs_disk_key));
549
550 btrfs_set_disk_key_objectid(key, BTRFS_FIRST_CHUNK_TREE_OBJECTID);
551 btrfs_set_disk_key_type(key, BTRFS_CHUNK_ITEM_KEY);
552 btrfs_set_disk_key_offset(key, 0);
553
554 btrfs_set_stack_chunk_length(chunk, (u64)-1);
555 btrfs_set_stack_chunk_owner(chunk, BTRFS_EXTENT_TREE_OBJECTID);
556 btrfs_set_stack_chunk_stripe_len(chunk, 64 * 1024);
557 btrfs_set_stack_chunk_type(chunk, BTRFS_BLOCK_GROUP_SYSTEM);
558 btrfs_set_stack_chunk_io_align(chunk, sectorsize);
559 btrfs_set_stack_chunk_io_width(chunk, sectorsize);
560 btrfs_set_stack_chunk_sector_size(chunk, sectorsize);
561 btrfs_set_stack_chunk_num_stripes(chunk, 1);
562 btrfs_set_stack_chunk_sub_stripes(chunk, 0);
563 chunk->stripe.devid = super->dev_item.devid;
564 chunk->stripe.offset = cpu_to_le64(0);
565 memcpy(chunk->stripe.dev_uuid, super->dev_item.uuid, BTRFS_UUID_SIZE);
566 btrfs_set_super_sys_array_size(super, sizeof(*key) + sizeof(*chunk));
567 csum_block(buffer, 4096);
568 }
569
570 static void *restore_worker(void *data)
571 {
572 struct mdrestore_struct *mdres = (struct mdrestore_struct *)data;
573 struct async_work *async;
574 size_t size;
575 u8 *buffer;
576 u8 *outbuf;
577 int outfd;
578 int ret;
579
580 outfd = fileno(mdres->out);
581 buffer = malloc(MAX_PENDING_SIZE * 2);
582 BUG_ON(!buffer);
583
584 while (1) {
585 pthread_mutex_lock(&mdres->mutex);
586 while (list_empty(&mdres->list)) {
587 if (mdres->done) {
588 pthread_mutex_unlock(&mdres->mutex);
589 goto out;
590 }
591 pthread_cond_wait(&mdres->cond, &mdres->mutex);
592 }
593 async = list_entry(mdres->list.next, struct async_work, list);
594 list_del_init(&async->list);
595 pthread_mutex_unlock(&mdres->mutex);
596
597 if (mdres->compress_method == COMPRESS_ZLIB) {
598 size = MAX_PENDING_SIZE * 2;
599 ret = uncompress(buffer, (unsigned long *)&size,
600 async->buffer, async->bufsize);
601 BUG_ON(ret != Z_OK);
602 outbuf = buffer;
603 } else {
604 outbuf = async->buffer;
605 size = async->bufsize;
606 }
607
608 if (async->start == BTRFS_SUPER_INFO_OFFSET)
609 update_super(outbuf);
610
611 ret = pwrite64(outfd, outbuf, size, async->start);
612 BUG_ON(ret != size);
613
614 pthread_mutex_lock(&mdres->mutex);
615 mdres->num_items--;
616 pthread_mutex_unlock(&mdres->mutex);
617
618 free(async->buffer);
619 free(async);
620 }
621 out:
622 free(buffer);
623 pthread_exit(NULL);
624 }
625
626 static int mdresotre_init(struct mdrestore_struct *mdres,
627 FILE *in, FILE *out, int num_threads)
628 {
629 int i, ret = 0;
630
631 memset(mdres, 0, sizeof(*mdres));
632 pthread_cond_init(&mdres->cond, NULL);
633 pthread_mutex_init(&mdres->mutex, NULL);
634 INIT_LIST_HEAD(&mdres->list);
635 mdres->in = in;
636 mdres->out = out;
637
638 if (!num_threads)
639 return 0;
640
641 mdres->num_threads = num_threads;
642 mdres->threads = calloc(num_threads, sizeof(pthread_t));
643 if (!mdres->threads)
644 return -ENOMEM;
645 for (i = 0; i < num_threads; i++) {
646 ret = pthread_create(mdres->threads + i, NULL, restore_worker,
647 mdres);
648 if (ret)
649 break;
650 }
651 return ret;
652 }
653
654 static void mdresotre_destroy(struct mdrestore_struct *mdres)
655 {
656 int i;
657 pthread_mutex_lock(&mdres->mutex);
658 mdres->done = 1;
659 pthread_cond_broadcast(&mdres->cond);
660 pthread_mutex_unlock(&mdres->mutex);
661
662 for (i = 0; i < mdres->num_threads; i++)
663 pthread_join(mdres->threads[i], NULL);
664
665 pthread_cond_destroy(&mdres->cond);
666 pthread_mutex_destroy(&mdres->mutex);
667 free(mdres->threads);
668 }
669
670 static int add_cluster(struct meta_cluster *cluster,
671 struct mdrestore_struct *mdres, u64 *next)
672 {
673 struct meta_cluster_item *item;
674 struct meta_cluster_header *header = &cluster->header;
675 struct async_work *async;
676 u64 bytenr;
677 u32 i, nritems;
678 int ret;
679
680 BUG_ON(mdres->num_items);
681 mdres->compress_method = header->compress;
682
683 bytenr = le64_to_cpu(header->bytenr) + BLOCK_SIZE;
684 nritems = le32_to_cpu(header->nritems);
685 for (i = 0; i < nritems; i++) {
686 item = &cluster->items[i];
687 async = calloc(1, sizeof(*async));
688 async->start = le64_to_cpu(item->bytenr);
689 async->bufsize = le32_to_cpu(item->size);
690 async->buffer = malloc(async->bufsize);
691 ret = fread(async->buffer, async->bufsize, 1, mdres->in);
692 BUG_ON(ret != 1);
693 bytenr += async->bufsize;
694
695 pthread_mutex_lock(&mdres->mutex);
696 list_add_tail(&async->list, &mdres->list);
697 mdres->num_items++;
698 pthread_cond_signal(&mdres->cond);
699 pthread_mutex_unlock(&mdres->mutex);
700 }
701 if (bytenr & BLOCK_MASK) {
702 char buffer[BLOCK_MASK];
703 size_t size = BLOCK_SIZE - (bytenr & BLOCK_MASK);
704
705 bytenr += size;
706 ret = fread(buffer, size, 1, mdres->in);
707 BUG_ON(ret != 1);
708 }
709 *next = bytenr;
710 return 0;
711 }
712
713 static int wait_for_worker(struct mdrestore_struct *mdres)
714 {
715 pthread_mutex_lock(&mdres->mutex);
716 while (mdres->num_items > 0) {
717 struct timespec ts = {
718 .tv_sec = 0,
719 .tv_nsec = 10000000,
720 };
721 pthread_mutex_unlock(&mdres->mutex);
722 nanosleep(&ts, NULL);
723 pthread_mutex_lock(&mdres->mutex);
724 }
725 pthread_mutex_unlock(&mdres->mutex);
726 return 0;
727 }
728
729 static int restore_metadump(const char *input, FILE *out, int num_threads)
730 {
731 struct meta_cluster *cluster;
732 struct meta_cluster_header *header;
733 struct mdrestore_struct mdrestore;
734 u64 bytenr = 0;
735 FILE *in;
736 int ret;
737
738 if (!strcmp(input, "-")) {
739 in = stdin;
740 } else {
741 in = fopen(input, "r");
742 if (!in) {
743 perror("unable to open metadump image");
744 exit(1);
745 }
746 }
747
748 cluster = malloc(BLOCK_SIZE);
749 BUG_ON(!cluster);
750
751 ret = mdresotre_init(&mdrestore, in, out, num_threads);
752 BUG_ON(ret);
753
754 while (1) {
755 ret = fread(cluster, BLOCK_SIZE, 1, in);
756 if (!ret)
757 break;
758
759 header = &cluster->header;
760 if (le64_to_cpu(header->magic) != HEADER_MAGIC ||
761 le64_to_cpu(header->bytenr) != bytenr) {
762 fprintf(stderr, "bad header in metadump image\n");
763 exit(1);
764 }
765 ret = add_cluster(cluster, &mdrestore, &bytenr);
766 BUG_ON(ret);
767
768 wait_for_worker(&mdrestore);
769 }
770
771 mdresotre_destroy(&mdrestore);
772 free(cluster);
773 if (in != stdin)
774 fclose(in);
775 return ret;
776 }
777
778 static void print_usage(void)
779 {
780 fprintf(stderr, "usage: btrfs-image [options] source target\n");
781 fprintf(stderr, "\t-r \trestore metadump image\n");
782 fprintf(stderr, "\t-c value\tcompression level (0 ~ 9)\n");
783 fprintf(stderr, "\t-t value\tnumber of threads (1 ~ 32)\n");
784 exit(1);
785 }
786
787 int main(int argc, char *argv[])
788 {
789 char *source;
790 char *target;
791 int num_threads = 0;
792 int compress_level = 0;
793 int create = 1;
794 int ret;
795 FILE *out;
796
797 while (1) {
798 int c = getopt(argc, argv, "rc:t:");
799 if (c < 0)
800 break;
801 switch (c) {
802 case 'r':
803 create = 0;
804 break;
805 case 't':
806 num_threads = atoi(optarg);
807 if (num_threads <= 0 || num_threads > 32)
808 print_usage();
809 break;
810 case 'c':
811 compress_level = atoi(optarg);
812 if (compress_level < 0 || compress_level > 9)
813 print_usage();
814 break;
815 default:
816 print_usage();
817 }
818 }
819
820 argc = argc - optind;
821 if (argc != 2)
822 print_usage();
823 source = argv[optind];
824 target = argv[optind + 1];
825
826 if (create && !strcmp(target, "-")) {
827 out = stdout;
828 } else {
829 out = fopen(target, "w+");
830 if (!out) {
831 perror("unable to create target file");
832 exit(1);
833 }
834 }
835
836 if (num_threads == 0 && compress_level > 0) {
837 num_threads = sysconf(_SC_NPROCESSORS_ONLN);
838 if (num_threads <= 0)
839 num_threads = 1;
840 }
841
842 if (create)
843 ret = create_metadump(source, out, num_threads,
844 compress_level);
845 else
846 ret = restore_metadump(source, out, 1);
847
848 if (out == stdout)
849 fflush(out);
850 else
851 fclose(out);
852
853 exit(0);
854 }
(deprecated) Btrfs progs developments and patch integration