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btrfs-progs: Cleanup check_tree_block() function
[btrfs-progs-unstable/devel.git] / btrfs-convert.c
blobda10ad668ea6d5965e8964fa21d6a75b46f22798
1 /*
2 * Copyright (C) 2007 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 #include "kerncompat.h"
20
21 #include <sys/ioctl.h>
22 #include <sys/mount.h>
23 #include <stdio.h>
24 #include <stdlib.h>
25 #include <sys/types.h>
26 #include <sys/stat.h>
27 #include <sys/acl.h>
28 #include <fcntl.h>
29 #include <unistd.h>
30 #include <uuid/uuid.h>
31 #include <linux/limits.h>
32
33 #include "ctree.h"
34 #include "disk-io.h"
35 #include "volumes.h"
36 #include "transaction.h"
37 #include "crc32c.h"
38 #include "utils.h"
39 #include "task-utils.h"
40 #include <ext2fs/ext2_fs.h>
41 #include <ext2fs/ext2fs.h>
42 #include <ext2fs/ext2_ext_attr.h>
43
44 #define INO_OFFSET (BTRFS_FIRST_FREE_OBJECTID - EXT2_ROOT_INO)
45 #define EXT2_IMAGE_SUBVOL_OBJECTID BTRFS_FIRST_FREE_OBJECTID
46
47 struct task_ctx {
48 uint32_t max_copy_inodes;
49 uint32_t cur_copy_inodes;
50 struct task_info *info;
51 };
52
53 static void *print_copied_inodes(void *p)
54 {
55 struct task_ctx *priv = p;
56 const char work_indicator[] = { '.', 'o', 'O', 'o' };
57 uint32_t count = 0;
58
59 task_period_start(priv->info, 1000 /* 1s */);
60 while (1) {
61 count++;
62 printf("copy inodes [%c] [%10d/%10d]\r",
63 work_indicator[count % 4], priv->cur_copy_inodes,
64 priv->max_copy_inodes);
65 fflush(stdout);
66 task_period_wait(priv->info);
67 }
68
69 return NULL;
70 }
71
72 static int after_copied_inodes(void *p)
73 {
74 struct task_ctx *priv = p;
75
76 printf("\n");
77 task_period_stop(priv->info);
78
79 return 0;
80 }
81
82 /*
83 * Open Ext2fs in readonly mode, read block allocation bitmap and
84 * inode bitmap into memory.
85 */
86 static int open_ext2fs(const char *name, ext2_filsys *ret_fs)
87 {
88 errcode_t ret;
89 ext2_filsys ext2_fs;
90 ext2_ino_t ino;
91 ret = ext2fs_open(name, 0, 0, 0, unix_io_manager, &ext2_fs);
92 if (ret) {
93 fprintf(stderr, "ext2fs_open: %s\n", error_message(ret));
94 goto fail;
95 }
96 ret = ext2fs_read_inode_bitmap(ext2_fs);
97 if (ret) {
98 fprintf(stderr, "ext2fs_read_inode_bitmap: %s\n",
99 error_message(ret));
100 goto fail;
101 }
102 ret = ext2fs_read_block_bitmap(ext2_fs);
103 if (ret) {
104 fprintf(stderr, "ext2fs_read_block_bitmap: %s\n",
105 error_message(ret));
106 goto fail;
107 }
108 /*
109 * search each block group for a free inode. this set up
110 * uninit block/inode bitmaps appropriately.
111 */
112 ino = 1;
113 while (ino <= ext2_fs->super->s_inodes_count) {
114 ext2_ino_t foo;
115 ext2fs_new_inode(ext2_fs, ino, 0, NULL, &foo);
116 ino += EXT2_INODES_PER_GROUP(ext2_fs->super);
117 }
118
119 *ret_fs = ext2_fs;
120 return 0;
121 fail:
122 return -1;
123 }
124
125 static int close_ext2fs(ext2_filsys fs)
126 {
127 ext2fs_close(fs);
128 return 0;
129 }
130
131 static int ext2_alloc_block(ext2_filsys fs, u64 goal, u64 *block_ret)
132 {
133 blk_t block;
134
135 if (!ext2fs_new_block(fs, goal, NULL, &block)) {
136 ext2fs_fast_mark_block_bitmap(fs->block_map, block);
137 *block_ret = block;
138 return 0;
139 }
140 return -ENOSPC;
141 }
142
143 static int ext2_free_block(ext2_filsys fs, u64 block)
144 {
145 BUG_ON(block != (blk_t)block);
146 ext2fs_fast_unmark_block_bitmap(fs->block_map, block);
147 return 0;
148 }
149
150 static int cache_free_extents(struct btrfs_root *root, ext2_filsys ext2_fs)
151
152 {
153 int i, ret = 0;
154 blk_t block;
155 u64 bytenr;
156 u64 blocksize = ext2_fs->blocksize;
157
158 block = ext2_fs->super->s_first_data_block;
159 for (; block < ext2_fs->super->s_blocks_count; block++) {
160 if (ext2fs_fast_test_block_bitmap(ext2_fs->block_map, block))
161 continue;
162 bytenr = block * blocksize;
163 ret = set_extent_dirty(&root->fs_info->free_space_cache,
164 bytenr, bytenr + blocksize - 1, 0);
165 BUG_ON(ret);
166 }
167
168 for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
169 bytenr = btrfs_sb_offset(i);
170 bytenr &= ~((u64)BTRFS_STRIPE_LEN - 1);
171 if (bytenr >= blocksize * ext2_fs->super->s_blocks_count)
172 break;
173 clear_extent_dirty(&root->fs_info->free_space_cache, bytenr,
174 bytenr + BTRFS_STRIPE_LEN - 1, 0);
175 }
176
177 clear_extent_dirty(&root->fs_info->free_space_cache,
178 0, BTRFS_SUPER_INFO_OFFSET - 1, 0);
179
180 return 0;
181 }
182
183 static int custom_alloc_extent(struct btrfs_root *root, u64 num_bytes,
184 u64 hint_byte, struct btrfs_key *ins)
185 {
186 u64 start;
187 u64 end;
188 u64 last = hint_byte;
189 int ret;
190 int wrapped = 0;
191 struct btrfs_block_group_cache *cache;
192
193 while(1) {
194 ret = find_first_extent_bit(&root->fs_info->free_space_cache,
195 last, &start, &end, EXTENT_DIRTY);
196 if (ret) {
197 if (wrapped++ == 0) {
198 last = 0;
199 continue;
200 } else {
201 goto fail;
202 }
203 }
204
205 start = max(last, start);
206 last = end + 1;
207 if (last - start < num_bytes)
208 continue;
209
210 last = start + num_bytes;
211 if (test_range_bit(&root->fs_info->pinned_extents,
212 start, last - 1, EXTENT_DIRTY, 0))
213 continue;
214
215 cache = btrfs_lookup_block_group(root->fs_info, start);
216 BUG_ON(!cache);
217 if (cache->flags & BTRFS_BLOCK_GROUP_SYSTEM ||
218 last > cache->key.objectid + cache->key.offset) {
219 last = cache->key.objectid + cache->key.offset;
220 continue;
221 }
222
223 clear_extent_dirty(&root->fs_info->free_space_cache,
224 start, start + num_bytes - 1, 0);
225
226 ins->objectid = start;
227 ins->offset = num_bytes;
228 ins->type = BTRFS_EXTENT_ITEM_KEY;
229 return 0;
230 }
231 fail:
232 fprintf(stderr, "not enough free space\n");
233 return -ENOSPC;
234 }
235
236 static int intersect_with_sb(u64 bytenr, u64 num_bytes)
237 {
238 int i;
239 u64 offset;
240
241 for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
242 offset = btrfs_sb_offset(i);
243 offset &= ~((u64)BTRFS_STRIPE_LEN - 1);
244
245 if (bytenr < offset + BTRFS_STRIPE_LEN &&
246 bytenr + num_bytes > offset)
247 return 1;
248 }
249 return 0;
250 }
251
252 static int custom_free_extent(struct btrfs_root *root, u64 bytenr,
253 u64 num_bytes)
254 {
255 return intersect_with_sb(bytenr, num_bytes);
256 }
257
258 static struct btrfs_extent_ops extent_ops = {
259 .alloc_extent = custom_alloc_extent,
260 .free_extent = custom_free_extent,
261 };
262
263 struct dir_iterate_data {
264 struct btrfs_trans_handle *trans;
265 struct btrfs_root *root;
266 struct btrfs_inode_item *inode;
267 u64 objectid;
268 u64 index_cnt;
269 u64 parent;
270 int errcode;
271 };
272
273 static u8 filetype_conversion_table[EXT2_FT_MAX] = {
274 [EXT2_FT_UNKNOWN] = BTRFS_FT_UNKNOWN,
275 [EXT2_FT_REG_FILE] = BTRFS_FT_REG_FILE,
276 [EXT2_FT_DIR] = BTRFS_FT_DIR,
277 [EXT2_FT_CHRDEV] = BTRFS_FT_CHRDEV,
278 [EXT2_FT_BLKDEV] = BTRFS_FT_BLKDEV,
279 [EXT2_FT_FIFO] = BTRFS_FT_FIFO,
280 [EXT2_FT_SOCK] = BTRFS_FT_SOCK,
281 [EXT2_FT_SYMLINK] = BTRFS_FT_SYMLINK,
282 };
283
284 static int dir_iterate_proc(ext2_ino_t dir, int entry,
285 struct ext2_dir_entry *dirent,
286 int offset, int blocksize,
287 char *buf,void *priv_data)
288 {
289 int ret;
290 int file_type;
291 u64 objectid;
292 u64 inode_size;
293 char dotdot[] = "..";
294 struct btrfs_key location;
295 struct dir_iterate_data *idata = (struct dir_iterate_data *)priv_data;
296 int name_len;
297
298 name_len = dirent->name_len & 0xFF;
299
300 objectid = dirent->inode + INO_OFFSET;
301 if (!strncmp(dirent->name, dotdot, name_len)) {
302 if (name_len == 2) {
303 BUG_ON(idata->parent != 0);
304 idata->parent = objectid;
305 }
306 return 0;
307 }
308 if (dirent->inode < EXT2_GOOD_OLD_FIRST_INO)
309 return 0;
310
311 location.objectid = objectid;
312 location.offset = 0;
313 btrfs_set_key_type(&location, BTRFS_INODE_ITEM_KEY);
314
315 file_type = dirent->name_len >> 8;
316 BUG_ON(file_type > EXT2_FT_SYMLINK);
317 ret = btrfs_insert_dir_item(idata->trans, idata->root,
318 dirent->name, name_len,
319 idata->objectid, &location,
320 filetype_conversion_table[file_type],
321 idata->index_cnt);
322 if (ret)
323 goto fail;
324 ret = btrfs_insert_inode_ref(idata->trans, idata->root,
325 dirent->name, name_len,
326 objectid, idata->objectid,
327 idata->index_cnt);
328 if (ret)
329 goto fail;
330 idata->index_cnt++;
331 inode_size = btrfs_stack_inode_size(idata->inode) +
332 name_len * 2;
333 btrfs_set_stack_inode_size(idata->inode, inode_size);
334 return 0;
335 fail:
336 idata->errcode = ret;
337 return BLOCK_ABORT;
338 }
339
340 static int create_dir_entries(struct btrfs_trans_handle *trans,
341 struct btrfs_root *root, u64 objectid,
342 struct btrfs_inode_item *btrfs_inode,
343 ext2_filsys ext2_fs, ext2_ino_t ext2_ino)
344 {
345 int ret;
346 errcode_t err;
347 struct dir_iterate_data data = {
348 .trans = trans,
349 .root = root,
350 .inode = btrfs_inode,
351 .objectid = objectid,
352 .index_cnt = 2,
353 .parent = 0,
354 .errcode = 0,
355 };
356
357 err = ext2fs_dir_iterate2(ext2_fs, ext2_ino, 0, NULL,
358 dir_iterate_proc, &data);
359 if (err)
360 goto error;
361 ret = data.errcode;
362 if (ret == 0 && data.parent == objectid) {
363 ret = btrfs_insert_inode_ref(trans, root, "..", 2,
364 objectid, objectid, 0);
365 }
366 return ret;
367 error:
368 fprintf(stderr, "ext2fs_dir_iterate2: %s\n", error_message(err));
369 return -1;
370 }
371
372 static int read_disk_extent(struct btrfs_root *root, u64 bytenr,
373 u32 num_bytes, char *buffer)
374 {
375 int ret;
376 struct btrfs_fs_devices *fs_devs = root->fs_info->fs_devices;
377
378 ret = pread(fs_devs->latest_bdev, buffer, num_bytes, bytenr);
379 if (ret != num_bytes)
380 goto fail;
381 ret = 0;
382 fail:
383 if (ret > 0)
384 ret = -1;
385 return ret;
386 }
387
388 static int csum_disk_extent(struct btrfs_trans_handle *trans,
389 struct btrfs_root *root,
390 u64 disk_bytenr, u64 num_bytes)
391 {
392 u32 blocksize = root->sectorsize;
393 u64 offset;
394 char *buffer;
395 int ret = 0;
396
397 buffer = malloc(blocksize);
398 if (!buffer)
399 return -ENOMEM;
400 for (offset = 0; offset < num_bytes; offset += blocksize) {
401 ret = read_disk_extent(root, disk_bytenr + offset,
402 blocksize, buffer);
403 if (ret)
404 break;
405 ret = btrfs_csum_file_block(trans,
406 root->fs_info->csum_root,
407 disk_bytenr + num_bytes,
408 disk_bytenr + offset,
409 buffer, blocksize);
410 if (ret)
411 break;
412 }
413 free(buffer);
414 return ret;
415 }
416
417 static int record_file_blocks(struct btrfs_trans_handle *trans,
418 struct btrfs_root *root, u64 objectid,
419 struct btrfs_inode_item *inode,
420 u64 file_block, u64 disk_block,
421 u64 num_blocks, int checksum)
422 {
423 int ret;
424 u64 file_pos = file_block * root->sectorsize;
425 u64 disk_bytenr = disk_block * root->sectorsize;
426 u64 num_bytes = num_blocks * root->sectorsize;
427 ret = btrfs_record_file_extent(trans, root, objectid, inode, file_pos,
428 disk_bytenr, num_bytes);
429
430 if (ret || !checksum || disk_bytenr == 0)
431 return ret;
432
433 return csum_disk_extent(trans, root, disk_bytenr, num_bytes);
434 }
435
436 struct blk_iterate_data {
437 struct btrfs_trans_handle *trans;
438 struct btrfs_root *root;
439 struct btrfs_inode_item *inode;
440 u64 objectid;
441 u64 first_block;
442 u64 disk_block;
443 u64 num_blocks;
444 u64 boundary;
445 int checksum;
446 int errcode;
447 };
448
449 static int block_iterate_proc(ext2_filsys ext2_fs,
450 u64 disk_block, u64 file_block,
451 struct blk_iterate_data *idata)
452 {
453 int ret;
454 int sb_region;
455 int do_barrier;
456 struct btrfs_root *root = idata->root;
457 struct btrfs_trans_handle *trans = idata->trans;
458 struct btrfs_block_group_cache *cache;
459 u64 bytenr = disk_block * root->sectorsize;
460
461 sb_region = intersect_with_sb(bytenr, root->sectorsize);
462 do_barrier = sb_region || disk_block >= idata->boundary;
463 if ((idata->num_blocks > 0 && do_barrier) ||
464 (file_block > idata->first_block + idata->num_blocks) ||
465 (disk_block != idata->disk_block + idata->num_blocks)) {
466 if (idata->num_blocks > 0) {
467 ret = record_file_blocks(trans, root, idata->objectid,
468 idata->inode, idata->first_block,
469 idata->disk_block, idata->num_blocks,
470 idata->checksum);
471 if (ret)
472 goto fail;
473 idata->first_block += idata->num_blocks;
474 idata->num_blocks = 0;
475 }
476 if (file_block > idata->first_block) {
477 ret = record_file_blocks(trans, root, idata->objectid,
478 idata->inode, idata->first_block,
479 0, file_block - idata->first_block,
480 idata->checksum);
481 if (ret)
482 goto fail;
483 }
484
485 if (sb_region) {
486 bytenr += BTRFS_STRIPE_LEN - 1;
487 bytenr &= ~((u64)BTRFS_STRIPE_LEN - 1);
488 } else {
489 cache = btrfs_lookup_block_group(root->fs_info, bytenr);
490 BUG_ON(!cache);
491 bytenr = cache->key.objectid + cache->key.offset;
492 }
493
494 idata->first_block = file_block;
495 idata->disk_block = disk_block;
496 idata->boundary = bytenr / root->sectorsize;
497 }
498 idata->num_blocks++;
499 return 0;
500 fail:
501 idata->errcode = ret;
502 return BLOCK_ABORT;
503 }
504
505 static int __block_iterate_proc(ext2_filsys fs, blk_t *blocknr,
506 e2_blkcnt_t blockcnt, blk_t ref_block,
507 int ref_offset, void *priv_data)
508 {
509 struct blk_iterate_data *idata;
510 idata = (struct blk_iterate_data *)priv_data;
511 return block_iterate_proc(fs, *blocknr, blockcnt, idata);
512 }
513
514 /*
515 * traverse file's data blocks, record these data blocks as file extents.
516 */
517 static int create_file_extents(struct btrfs_trans_handle *trans,
518 struct btrfs_root *root, u64 objectid,
519 struct btrfs_inode_item *btrfs_inode,
520 ext2_filsys ext2_fs, ext2_ino_t ext2_ino,
521 int datacsum, int packing)
522 {
523 int ret;
524 char *buffer = NULL;
525 errcode_t err;
526 u32 last_block;
527 u32 sectorsize = root->sectorsize;
528 u64 inode_size = btrfs_stack_inode_size(btrfs_inode);
529 struct blk_iterate_data data = {
530 .trans = trans,
531 .root = root,
532 .inode = btrfs_inode,
533 .objectid = objectid,
534 .first_block = 0,
535 .disk_block = 0,
536 .num_blocks = 0,
537 .boundary = (u64)-1,
538 .checksum = datacsum,
539 .errcode = 0,
540 };
541 err = ext2fs_block_iterate2(ext2_fs, ext2_ino, BLOCK_FLAG_DATA_ONLY,
542 NULL, __block_iterate_proc, &data);
543 if (err)
544 goto error;
545 ret = data.errcode;
546 if (ret)
547 goto fail;
548 if (packing && data.first_block == 0 && data.num_blocks > 0 &&
549 inode_size <= BTRFS_MAX_INLINE_DATA_SIZE(root)) {
550 u64 num_bytes = data.num_blocks * sectorsize;
551 u64 disk_bytenr = data.disk_block * sectorsize;
552 u64 nbytes;
553
554 buffer = malloc(num_bytes);
555 if (!buffer)
556 return -ENOMEM;
557 ret = read_disk_extent(root, disk_bytenr, num_bytes, buffer);
558 if (ret)
559 goto fail;
560 if (num_bytes > inode_size)
561 num_bytes = inode_size;
562 ret = btrfs_insert_inline_extent(trans, root, objectid,
563 0, buffer, num_bytes);
564 if (ret)
565 goto fail;
566 nbytes = btrfs_stack_inode_nbytes(btrfs_inode) + num_bytes;
567 btrfs_set_stack_inode_nbytes(btrfs_inode, nbytes);
568 } else if (data.num_blocks > 0) {
569 ret = record_file_blocks(trans, root, objectid, btrfs_inode,
570 data.first_block, data.disk_block,
571 data.num_blocks, data.checksum);
572 if (ret)
573 goto fail;
574 }
575 data.first_block += data.num_blocks;
576 last_block = (inode_size + sectorsize - 1) / sectorsize;
577 if (last_block > data.first_block) {
578 ret = record_file_blocks(trans, root, objectid, btrfs_inode,
579 data.first_block, 0, last_block -
580 data.first_block, data.checksum);
581 }
582 fail:
583 free(buffer);
584 return ret;
585 error:
586 fprintf(stderr, "ext2fs_block_iterate2: %s\n", error_message(err));
587 return -1;
588 }
589
590 static int create_symbol_link(struct btrfs_trans_handle *trans,
591 struct btrfs_root *root, u64 objectid,
592 struct btrfs_inode_item *btrfs_inode,
593 ext2_filsys ext2_fs, ext2_ino_t ext2_ino,
594 struct ext2_inode *ext2_inode)
595 {
596 int ret;
597 char *pathname;
598 u64 inode_size = btrfs_stack_inode_size(btrfs_inode);
599 if (ext2fs_inode_data_blocks(ext2_fs, ext2_inode)) {
600 btrfs_set_stack_inode_size(btrfs_inode, inode_size + 1);
601 ret = create_file_extents(trans, root, objectid, btrfs_inode,
602 ext2_fs, ext2_ino, 1, 1);
603 btrfs_set_stack_inode_size(btrfs_inode, inode_size);
604 return ret;
605 }
606
607 pathname = (char *)&(ext2_inode->i_block[0]);
608 BUG_ON(pathname[inode_size] != 0);
609 ret = btrfs_insert_inline_extent(trans, root, objectid, 0,
610 pathname, inode_size + 1);
611 btrfs_set_stack_inode_nbytes(btrfs_inode, inode_size + 1);
612 return ret;
613 }
614
615 /*
616 * Following xattr/acl related codes are based on codes in
617 * fs/ext3/xattr.c and fs/ext3/acl.c
618 */
619 #define EXT2_XATTR_BHDR(ptr) ((struct ext2_ext_attr_header *)(ptr))
620 #define EXT2_XATTR_BFIRST(ptr) \
621 ((struct ext2_ext_attr_entry *)(EXT2_XATTR_BHDR(ptr) + 1))
622 #define EXT2_XATTR_IHDR(inode) \
623 ((struct ext2_ext_attr_header *) ((void *)(inode) + \
624 EXT2_GOOD_OLD_INODE_SIZE + (inode)->i_extra_isize))
625 #define EXT2_XATTR_IFIRST(inode) \
626 ((struct ext2_ext_attr_entry *) ((void *)EXT2_XATTR_IHDR(inode) + \
627 sizeof(EXT2_XATTR_IHDR(inode)->h_magic)))
628
629 static int ext2_xattr_check_names(struct ext2_ext_attr_entry *entry,
630 const void *end)
631 {
632 struct ext2_ext_attr_entry *next;
633
634 while (!EXT2_EXT_IS_LAST_ENTRY(entry)) {
635 next = EXT2_EXT_ATTR_NEXT(entry);
636 if ((void *)next >= end)
637 return -EIO;
638 entry = next;
639 }
640 return 0;
641 }
642
643 static int ext2_xattr_check_block(const char *buf, size_t size)
644 {
645 int error;
646 struct ext2_ext_attr_header *header = EXT2_XATTR_BHDR(buf);
647
648 if (header->h_magic != EXT2_EXT_ATTR_MAGIC ||
649 header->h_blocks != 1)
650 return -EIO;
651 error = ext2_xattr_check_names(EXT2_XATTR_BFIRST(buf), buf + size);
652 return error;
653 }
654
655 static int ext2_xattr_check_entry(struct ext2_ext_attr_entry *entry,
656 size_t size)
657 {
658 size_t value_size = entry->e_value_size;
659
660 if (entry->e_value_block != 0 || value_size > size ||
661 entry->e_value_offs + value_size > size)
662 return -EIO;
663 return 0;
664 }
665
666 #define EXT2_ACL_VERSION 0x0001
667
668 typedef struct {
669 __le16 e_tag;
670 __le16 e_perm;
671 __le32 e_id;
672 } ext2_acl_entry;
673
674 typedef struct {
675 __le16 e_tag;
676 __le16 e_perm;
677 } ext2_acl_entry_short;
678
679 typedef struct {
680 __le32 a_version;
681 } ext2_acl_header;
682
683 static inline int ext2_acl_count(size_t size)
684 {
685 ssize_t s;
686 size -= sizeof(ext2_acl_header);
687 s = size - 4 * sizeof(ext2_acl_entry_short);
688 if (s < 0) {
689 if (size % sizeof(ext2_acl_entry_short))
690 return -1;
691 return size / sizeof(ext2_acl_entry_short);
692 } else {
693 if (s % sizeof(ext2_acl_entry))
694 return -1;
695 return s / sizeof(ext2_acl_entry) + 4;
696 }
697 }
698
699 #define ACL_EA_VERSION 0x0002
700
701 typedef struct {
702 __le16 e_tag;
703 __le16 e_perm;
704 __le32 e_id;
705 } acl_ea_entry;
706
707 typedef struct {
708 __le32 a_version;
709 acl_ea_entry a_entries[0];
710 } acl_ea_header;
711
712 static inline size_t acl_ea_size(int count)
713 {
714 return sizeof(acl_ea_header) + count * sizeof(acl_ea_entry);
715 }
716
717 static int ext2_acl_to_xattr(void *dst, const void *src,
718 size_t dst_size, size_t src_size)
719 {
720 int i, count;
721 const void *end = src + src_size;
722 acl_ea_header *ext_acl = (acl_ea_header *)dst;
723 acl_ea_entry *dst_entry = ext_acl->a_entries;
724 ext2_acl_entry *src_entry;
725
726 if (src_size < sizeof(ext2_acl_header))
727 goto fail;
728 if (((ext2_acl_header *)src)->a_version !=
729 cpu_to_le32(EXT2_ACL_VERSION))
730 goto fail;
731 src += sizeof(ext2_acl_header);
732 count = ext2_acl_count(src_size);
733 if (count <= 0)
734 goto fail;
735
736 BUG_ON(dst_size < acl_ea_size(count));
737 ext_acl->a_version = cpu_to_le32(ACL_EA_VERSION);
738 for (i = 0; i < count; i++, dst_entry++) {
739 src_entry = (ext2_acl_entry *)src;
740 if (src + sizeof(ext2_acl_entry_short) > end)
741 goto fail;
742 dst_entry->e_tag = src_entry->e_tag;
743 dst_entry->e_perm = src_entry->e_perm;
744 switch (le16_to_cpu(src_entry->e_tag)) {
745 case ACL_USER_OBJ:
746 case ACL_GROUP_OBJ:
747 case ACL_MASK:
748 case ACL_OTHER:
749 src += sizeof(ext2_acl_entry_short);
750 dst_entry->e_id = cpu_to_le32(ACL_UNDEFINED_ID);
751 break;
752 case ACL_USER:
753 case ACL_GROUP:
754 src += sizeof(ext2_acl_entry);
755 if (src > end)
756 goto fail;
757 dst_entry->e_id = src_entry->e_id;
758 break;
759 default:
760 goto fail;
761 }
762 }
763 if (src != end)
764 goto fail;
765 return 0;
766 fail:
767 return -EINVAL;
768 }
769
770 static char *xattr_prefix_table[] = {
771 [1] = "user.",
772 [2] = "system.posix_acl_access",
773 [3] = "system.posix_acl_default",
774 [4] = "trusted.",
775 [6] = "security.",
776 };
777
778 static int copy_single_xattr(struct btrfs_trans_handle *trans,
779 struct btrfs_root *root, u64 objectid,
780 struct ext2_ext_attr_entry *entry,
781 const void *data, u32 datalen)
782 {
783 int ret = 0;
784 int name_len;
785 int name_index;
786 void *databuf = NULL;
787 char namebuf[XATTR_NAME_MAX + 1];
788
789 name_index = entry->e_name_index;
790 if (name_index >= ARRAY_SIZE(xattr_prefix_table) ||
791 xattr_prefix_table[name_index] == NULL)
792 return -EOPNOTSUPP;
793 name_len = strlen(xattr_prefix_table[name_index]) +
794 entry->e_name_len;
795 if (name_len >= sizeof(namebuf))
796 return -ERANGE;
797
798 if (name_index == 2 || name_index == 3) {
799 size_t bufsize = acl_ea_size(ext2_acl_count(datalen));
800 databuf = malloc(bufsize);
801 if (!databuf)
802 return -ENOMEM;
803 ret = ext2_acl_to_xattr(databuf, data, bufsize, datalen);
804 if (ret)
805 goto out;
806 data = databuf;
807 datalen = bufsize;
808 }
809 strncpy(namebuf, xattr_prefix_table[name_index], XATTR_NAME_MAX);
810 strncat(namebuf, EXT2_EXT_ATTR_NAME(entry), entry->e_name_len);
811 if (name_len + datalen > BTRFS_LEAF_DATA_SIZE(root) -
812 sizeof(struct btrfs_item) - sizeof(struct btrfs_dir_item)) {
813 fprintf(stderr, "skip large xattr on inode %Lu name %.*s\n",
814 objectid - INO_OFFSET, name_len, namebuf);
815 goto out;
816 }
817 ret = btrfs_insert_xattr_item(trans, root, namebuf, name_len,
818 data, datalen, objectid);
819 out:
820 free(databuf);
821 return ret;
822 }
823
824 static int copy_extended_attrs(struct btrfs_trans_handle *trans,
825 struct btrfs_root *root, u64 objectid,
826 struct btrfs_inode_item *btrfs_inode,
827 ext2_filsys ext2_fs, ext2_ino_t ext2_ino)
828 {
829 int ret = 0;
830 int inline_ea = 0;
831 errcode_t err;
832 u32 datalen;
833 u32 block_size = ext2_fs->blocksize;
834 u32 inode_size = EXT2_INODE_SIZE(ext2_fs->super);
835 struct ext2_inode_large *ext2_inode;
836 struct ext2_ext_attr_entry *entry;
837 void *data;
838 char *buffer = NULL;
839 char inode_buf[EXT2_GOOD_OLD_INODE_SIZE];
840
841 if (inode_size <= EXT2_GOOD_OLD_INODE_SIZE) {
842 ext2_inode = (struct ext2_inode_large *)inode_buf;
843 } else {
844 ext2_inode = (struct ext2_inode_large *)malloc(inode_size);
845 if (!ext2_inode)
846 return -ENOMEM;
847 }
848 err = ext2fs_read_inode_full(ext2_fs, ext2_ino, (void *)ext2_inode,
849 inode_size);
850 if (err) {
851 fprintf(stderr, "ext2fs_read_inode_full: %s\n",
852 error_message(err));
853 ret = -1;
854 goto out;
855 }
856
857 if (ext2_ino > ext2_fs->super->s_first_ino &&
858 inode_size > EXT2_GOOD_OLD_INODE_SIZE) {
859 if (EXT2_GOOD_OLD_INODE_SIZE +
860 ext2_inode->i_extra_isize > inode_size) {
861 ret = -EIO;
862 goto out;
863 }
864 if (ext2_inode->i_extra_isize != 0 &&
865 EXT2_XATTR_IHDR(ext2_inode)->h_magic ==
866 EXT2_EXT_ATTR_MAGIC) {
867 inline_ea = 1;
868 }
869 }
870 if (inline_ea) {
871 int total;
872 void *end = (void *)ext2_inode + inode_size;
873 entry = EXT2_XATTR_IFIRST(ext2_inode);
874 total = end - (void *)entry;
875 ret = ext2_xattr_check_names(entry, end);
876 if (ret)
877 goto out;
878 while (!EXT2_EXT_IS_LAST_ENTRY(entry)) {
879 ret = ext2_xattr_check_entry(entry, total);
880 if (ret)
881 goto out;
882 data = (void *)EXT2_XATTR_IFIRST(ext2_inode) +
883 entry->e_value_offs;
884 datalen = entry->e_value_size;
885 ret = copy_single_xattr(trans, root, objectid,
886 entry, data, datalen);
887 if (ret)
888 goto out;
889 entry = EXT2_EXT_ATTR_NEXT(entry);
890 }
891 }
892
893 if (ext2_inode->i_file_acl == 0)
894 goto out;
895
896 buffer = malloc(block_size);
897 if (!buffer) {
898 ret = -ENOMEM;
899 goto out;
900 }
901 err = ext2fs_read_ext_attr(ext2_fs, ext2_inode->i_file_acl, buffer);
902 if (err) {
903 fprintf(stderr, "ext2fs_read_ext_attr: %s\n",
904 error_message(err));
905 ret = -1;
906 goto out;
907 }
908 ret = ext2_xattr_check_block(buffer, block_size);
909 if (ret)
910 goto out;
911
912 entry = EXT2_XATTR_BFIRST(buffer);
913 while (!EXT2_EXT_IS_LAST_ENTRY(entry)) {
914 ret = ext2_xattr_check_entry(entry, block_size);
915 if (ret)
916 goto out;
917 data = buffer + entry->e_value_offs;
918 datalen = entry->e_value_size;
919 ret = copy_single_xattr(trans, root, objectid,
920 entry, data, datalen);
921 if (ret)
922 goto out;
923 entry = EXT2_EXT_ATTR_NEXT(entry);
924 }
925 out:
926 free(buffer);
927 if ((void *)ext2_inode != inode_buf)
928 free(ext2_inode);
929 return ret;
930 }
931 #define MINORBITS 20
932 #define MKDEV(ma, mi) (((ma) << MINORBITS) | (mi))
933
934 static inline dev_t old_decode_dev(u16 val)
935 {
936 return MKDEV((val >> 8) & 255, val & 255);
937 }
938
939 static inline dev_t new_decode_dev(u32 dev)
940 {
941 unsigned major = (dev & 0xfff00) >> 8;
942 unsigned minor = (dev & 0xff) | ((dev >> 12) & 0xfff00);
943 return MKDEV(major, minor);
944 }
945
946 static int copy_inode_item(struct btrfs_inode_item *dst,
947 struct ext2_inode *src, u32 blocksize)
948 {
949 btrfs_set_stack_inode_generation(dst, 1);
950 btrfs_set_stack_inode_size(dst, src->i_size);
951 btrfs_set_stack_inode_nbytes(dst, 0);
952 btrfs_set_stack_inode_block_group(dst, 0);
953 btrfs_set_stack_inode_nlink(dst, src->i_links_count);
954 btrfs_set_stack_inode_uid(dst, src->i_uid | (src->i_uid_high << 16));
955 btrfs_set_stack_inode_gid(dst, src->i_gid | (src->i_gid_high << 16));
956 btrfs_set_stack_inode_mode(dst, src->i_mode);
957 btrfs_set_stack_inode_rdev(dst, 0);
958 btrfs_set_stack_inode_flags(dst, 0);
959 btrfs_set_stack_timespec_sec(&dst->atime, src->i_atime);
960 btrfs_set_stack_timespec_nsec(&dst->atime, 0);
961 btrfs_set_stack_timespec_sec(&dst->ctime, src->i_ctime);
962 btrfs_set_stack_timespec_nsec(&dst->ctime, 0);
963 btrfs_set_stack_timespec_sec(&dst->mtime, src->i_mtime);
964 btrfs_set_stack_timespec_nsec(&dst->mtime, 0);
965 btrfs_set_stack_timespec_sec(&dst->otime, 0);
966 btrfs_set_stack_timespec_nsec(&dst->otime, 0);
967
968 if (S_ISDIR(src->i_mode)) {
969 btrfs_set_stack_inode_size(dst, 0);
970 btrfs_set_stack_inode_nlink(dst, 1);
971 }
972 if (S_ISREG(src->i_mode)) {
973 btrfs_set_stack_inode_size(dst, (u64)src->i_size_high << 32 |
974 (u64)src->i_size);
975 }
976 if (!S_ISREG(src->i_mode) && !S_ISDIR(src->i_mode) &&
977 !S_ISLNK(src->i_mode)) {
978 if (src->i_block[0]) {
979 btrfs_set_stack_inode_rdev(dst,
980 old_decode_dev(src->i_block[0]));
981 } else {
982 btrfs_set_stack_inode_rdev(dst,
983 new_decode_dev(src->i_block[1]));
984 }
985 }
986 return 0;
987 }
988
989 /*
990 * copy a single inode. do all the required works, such as cloning
991 * inode item, creating file extents and creating directory entries.
992 */
993 static int copy_single_inode(struct btrfs_trans_handle *trans,
994 struct btrfs_root *root, u64 objectid,
995 ext2_filsys ext2_fs, ext2_ino_t ext2_ino,
996 struct ext2_inode *ext2_inode,
997 int datacsum, int packing, int noxattr)
998 {
999 int ret;
1000 struct btrfs_key inode_key;
1001 struct btrfs_inode_item btrfs_inode;
1002
1003 if (ext2_inode->i_links_count == 0)
1004 return 0;
1005
1006 copy_inode_item(&btrfs_inode, ext2_inode, ext2_fs->blocksize);
1007 if (!datacsum && S_ISREG(ext2_inode->i_mode)) {
1008 u32 flags = btrfs_stack_inode_flags(&btrfs_inode) |
1009 BTRFS_INODE_NODATASUM;
1010 btrfs_set_stack_inode_flags(&btrfs_inode, flags);
1011 }
1012
1013 switch (ext2_inode->i_mode & S_IFMT) {
1014 case S_IFREG:
1015 ret = create_file_extents(trans, root, objectid, &btrfs_inode,
1016 ext2_fs, ext2_ino, datacsum, packing);
1017 break;
1018 case S_IFDIR:
1019 ret = create_dir_entries(trans, root, objectid, &btrfs_inode,
1020 ext2_fs, ext2_ino);
1021 break;
1022 case S_IFLNK:
1023 ret = create_symbol_link(trans, root, objectid, &btrfs_inode,
1024 ext2_fs, ext2_ino, ext2_inode);
1025 break;
1026 default:
1027 ret = 0;
1028 break;
1029 }
1030 if (ret)
1031 return ret;
1032
1033 if (!noxattr) {
1034 ret = copy_extended_attrs(trans, root, objectid, &btrfs_inode,
1035 ext2_fs, ext2_ino);
1036 if (ret)
1037 return ret;
1038 }
1039 inode_key.objectid = objectid;
1040 inode_key.offset = 0;
1041 btrfs_set_key_type(&inode_key, BTRFS_INODE_ITEM_KEY);
1042 ret = btrfs_insert_inode(trans, root, objectid, &btrfs_inode);
1043 return ret;
1044 }
1045
1046 static int copy_disk_extent(struct btrfs_root *root, u64 dst_bytenr,
1047 u64 src_bytenr, u32 num_bytes)
1048 {
1049 int ret;
1050 char *buffer;
1051 struct btrfs_fs_devices *fs_devs = root->fs_info->fs_devices;
1052
1053 buffer = malloc(num_bytes);
1054 if (!buffer)
1055 return -ENOMEM;
1056 ret = pread(fs_devs->latest_bdev, buffer, num_bytes, src_bytenr);
1057 if (ret != num_bytes)
1058 goto fail;
1059 ret = pwrite(fs_devs->latest_bdev, buffer, num_bytes, dst_bytenr);
1060 if (ret != num_bytes)
1061 goto fail;
1062 ret = 0;
1063 fail:
1064 free(buffer);
1065 if (ret > 0)
1066 ret = -1;
1067 return ret;
1068 }
1069 /*
1070 * scan ext2's inode bitmap and copy all used inodes.
1071 */
1072 static int copy_inodes(struct btrfs_root *root, ext2_filsys ext2_fs,
1073 int datacsum, int packing, int noxattr, struct task_ctx *p)
1074 {
1075 int ret;
1076 errcode_t err;
1077 ext2_inode_scan ext2_scan;
1078 struct ext2_inode ext2_inode;
1079 ext2_ino_t ext2_ino;
1080 u64 objectid;
1081 struct btrfs_trans_handle *trans;
1082
1083 trans = btrfs_start_transaction(root, 1);
1084 if (!trans)
1085 return -ENOMEM;
1086 err = ext2fs_open_inode_scan(ext2_fs, 0, &ext2_scan);
1087 if (err) {
1088 fprintf(stderr, "ext2fs_open_inode_scan: %s\n", error_message(err));
1089 return -1;
1090 }
1091 while (!(err = ext2fs_get_next_inode(ext2_scan, &ext2_ino,
1092 &ext2_inode))) {
1093 /* no more inodes */
1094 if (ext2_ino == 0)
1095 break;
1096 /* skip special inode in ext2fs */
1097 if (ext2_ino < EXT2_GOOD_OLD_FIRST_INO &&
1098 ext2_ino != EXT2_ROOT_INO)
1099 continue;
1100 objectid = ext2_ino + INO_OFFSET;
1101 ret = copy_single_inode(trans, root,
1102 objectid, ext2_fs, ext2_ino,
1103 &ext2_inode, datacsum, packing,
1104 noxattr);
1105 p->cur_copy_inodes++;
1106 if (ret)
1107 return ret;
1108 if (trans->blocks_used >= 4096) {
1109 ret = btrfs_commit_transaction(trans, root);
1110 BUG_ON(ret);
1111 trans = btrfs_start_transaction(root, 1);
1112 BUG_ON(!trans);
1113 }
1114 }
1115 if (err) {
1116 fprintf(stderr, "ext2fs_get_next_inode: %s\n", error_message(err));
1117 return -1;
1118 }
1119 ret = btrfs_commit_transaction(trans, root);
1120 BUG_ON(ret);
1121
1122 return ret;
1123 }
1124
1125 /*
1126 * Construct a range of ext2fs image file.
1127 * scan block allocation bitmap, find all blocks used by the ext2fs
1128 * in this range and create file extents that point to these blocks.
1129 *
1130 * Note: Before calling the function, no file extent points to blocks
1131 * in this range
1132 */
1133 static int create_image_file_range(struct btrfs_trans_handle *trans,
1134 struct btrfs_root *root, u64 objectid,
1135 struct btrfs_inode_item *inode,
1136 u64 start_byte, u64 end_byte,
1137 ext2_filsys ext2_fs)
1138 {
1139 u32 blocksize = ext2_fs->blocksize;
1140 u32 block = start_byte / blocksize;
1141 u32 last_block = (end_byte + blocksize - 1) / blocksize;
1142 int ret = 0;
1143 struct blk_iterate_data data = {
1144 .trans = trans,
1145 .root = root,
1146 .inode = inode,
1147 .objectid = objectid,
1148 .first_block = block,
1149 .disk_block = 0,
1150 .num_blocks = 0,
1151 .boundary = (u64)-1,
1152 .checksum = 0,
1153 .errcode = 0,
1154 };
1155 for (; start_byte < end_byte; block++, start_byte += blocksize) {
1156 if (!ext2fs_fast_test_block_bitmap(ext2_fs->block_map, block))
1157 continue;
1158 ret = block_iterate_proc(NULL, block, block, &data);
1159 if (ret & BLOCK_ABORT) {
1160 ret = data.errcode;
1161 goto fail;
1162 }
1163 }
1164 if (data.num_blocks > 0) {
1165 ret = record_file_blocks(trans, root, objectid, inode,
1166 data.first_block, data.disk_block,
1167 data.num_blocks, 0);
1168 if (ret)
1169 goto fail;
1170 data.first_block += data.num_blocks;
1171 }
1172 if (last_block > data.first_block) {
1173 ret = record_file_blocks(trans, root, objectid, inode,
1174 data.first_block, 0, last_block -
1175 data.first_block, 0);
1176 if (ret)
1177 goto fail;
1178 }
1179 fail:
1180 return ret;
1181 }
1182 /*
1183 * Create the ext2fs image file.
1184 */
1185 static int create_ext2_image(struct btrfs_root *root, ext2_filsys ext2_fs,
1186 const char *name)
1187 {
1188 int ret;
1189 struct btrfs_key key;
1190 struct btrfs_key location;
1191 struct btrfs_path path;
1192 struct btrfs_inode_item btrfs_inode;
1193 struct btrfs_inode_item *inode_item;
1194 struct extent_buffer *leaf;
1195 struct btrfs_fs_info *fs_info = root->fs_info;
1196 struct btrfs_root *extent_root = fs_info->extent_root;
1197 struct btrfs_trans_handle *trans;
1198 struct btrfs_extent_item *ei;
1199 struct btrfs_extent_inline_ref *iref;
1200 struct btrfs_extent_data_ref *dref;
1201 u64 bytenr;
1202 u64 num_bytes;
1203 u64 objectid;
1204 u64 last_byte;
1205 u64 first_free;
1206 u64 total_bytes;
1207 u32 sectorsize = root->sectorsize;
1208
1209 total_bytes = btrfs_super_total_bytes(fs_info->super_copy);
1210 first_free = BTRFS_SUPER_INFO_OFFSET + sectorsize * 2 - 1;
1211 first_free &= ~((u64)sectorsize - 1);
1212
1213 memset(&btrfs_inode, 0, sizeof(btrfs_inode));
1214 btrfs_set_stack_inode_generation(&btrfs_inode, 1);
1215 btrfs_set_stack_inode_size(&btrfs_inode, total_bytes);
1216 btrfs_set_stack_inode_nlink(&btrfs_inode, 1);
1217 btrfs_set_stack_inode_nbytes(&btrfs_inode, 0);
1218 btrfs_set_stack_inode_mode(&btrfs_inode, S_IFREG | 0400);
1219 btrfs_set_stack_inode_flags(&btrfs_inode, BTRFS_INODE_NODATASUM |
1220 BTRFS_INODE_READONLY);
1221 btrfs_init_path(&path);
1222 trans = btrfs_start_transaction(root, 1);
1223 BUG_ON(!trans);
1224
1225 objectid = btrfs_root_dirid(&root->root_item);
1226 ret = btrfs_find_free_objectid(trans, root, objectid, &objectid);
1227 if (ret)
1228 goto fail;
1229
1230 /*
1231 * copy blocks covered by extent #0 to new positions. extent #0 is
1232 * special, we can't rely on relocate_extents_range to relocate it.
1233 */
1234 for (last_byte = 0; last_byte < first_free; last_byte += sectorsize) {
1235 ret = custom_alloc_extent(root, sectorsize, 0, &key);
1236 if (ret)
1237 goto fail;
1238 ret = copy_disk_extent(root, key.objectid, last_byte,
1239 sectorsize);
1240 if (ret)
1241 goto fail;
1242 ret = btrfs_record_file_extent(trans, root, objectid,
1243 &btrfs_inode, last_byte,
1244 key.objectid, sectorsize);
1245 if (ret)
1246 goto fail;
1247 }
1248
1249 while(1) {
1250 key.objectid = last_byte;
1251 key.offset = 0;
1252 btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY);
1253 ret = btrfs_search_slot(trans, fs_info->extent_root,
1254 &key, &path, 0, 0);
1255 if (ret < 0)
1256 goto fail;
1257 next:
1258 leaf = path.nodes[0];
1259 if (path.slots[0] >= btrfs_header_nritems(leaf)) {
1260 ret = btrfs_next_leaf(extent_root, &path);
1261 if (ret < 0)
1262 goto fail;
1263 if (ret > 0)
1264 break;
1265 leaf = path.nodes[0];
1266 }
1267 btrfs_item_key_to_cpu(leaf, &key, path.slots[0]);
1268 if (last_byte > key.objectid ||
1269 key.type != BTRFS_EXTENT_ITEM_KEY) {
1270 path.slots[0]++;
1271 goto next;
1272 }
1273
1274 bytenr = key.objectid;
1275 num_bytes = key.offset;
1276 ei = btrfs_item_ptr(leaf, path.slots[0],
1277 struct btrfs_extent_item);
1278 if (!(btrfs_extent_flags(leaf, ei) & BTRFS_EXTENT_FLAG_DATA)) {
1279 path.slots[0]++;
1280 goto next;
1281 }
1282
1283 BUG_ON(btrfs_item_size_nr(leaf, path.slots[0]) != sizeof(*ei) +
1284 btrfs_extent_inline_ref_size(BTRFS_EXTENT_DATA_REF_KEY));
1285
1286 iref = (struct btrfs_extent_inline_ref *)(ei + 1);
1287 key.type = btrfs_extent_inline_ref_type(leaf, iref);
1288 BUG_ON(key.type != BTRFS_EXTENT_DATA_REF_KEY);
1289 dref = (struct btrfs_extent_data_ref *)(&iref->offset);
1290 if (btrfs_extent_data_ref_root(leaf, dref) !=
1291 BTRFS_FS_TREE_OBJECTID) {
1292 path.slots[0]++;
1293 goto next;
1294 }
1295
1296 if (bytenr > last_byte) {
1297 ret = create_image_file_range(trans, root, objectid,
1298 &btrfs_inode, last_byte,
1299 bytenr, ext2_fs);
1300 if (ret)
1301 goto fail;
1302 }
1303 ret = btrfs_record_file_extent(trans, root, objectid,
1304 &btrfs_inode, bytenr, bytenr,
1305 num_bytes);
1306 if (ret)
1307 goto fail;
1308 last_byte = bytenr + num_bytes;
1309 btrfs_release_path(&path);
1310
1311 if (trans->blocks_used >= 4096) {
1312 ret = btrfs_commit_transaction(trans, root);
1313 BUG_ON(ret);
1314 trans = btrfs_start_transaction(root, 1);
1315 BUG_ON(!trans);
1316 }
1317 }
1318 btrfs_release_path(&path);
1319 if (total_bytes > last_byte) {
1320 ret = create_image_file_range(trans, root, objectid,
1321 &btrfs_inode, last_byte,
1322 total_bytes, ext2_fs);
1323 if (ret)
1324 goto fail;
1325 }
1326
1327 ret = btrfs_insert_inode(trans, root, objectid, &btrfs_inode);
1328 if (ret)
1329 goto fail;
1330
1331 location.objectid = objectid;
1332 location.offset = 0;
1333 btrfs_set_key_type(&location, BTRFS_INODE_ITEM_KEY);
1334 ret = btrfs_insert_dir_item(trans, root, name, strlen(name),
1335 btrfs_root_dirid(&root->root_item),
1336 &location, EXT2_FT_REG_FILE, objectid);
1337 if (ret)
1338 goto fail;
1339 ret = btrfs_insert_inode_ref(trans, root, name, strlen(name),
1340 objectid,
1341 btrfs_root_dirid(&root->root_item),
1342 objectid);
1343 if (ret)
1344 goto fail;
1345 location.objectid = btrfs_root_dirid(&root->root_item);
1346 location.offset = 0;
1347 btrfs_set_key_type(&location, BTRFS_INODE_ITEM_KEY);
1348 ret = btrfs_lookup_inode(trans, root, &path, &location, 1);
1349 if (ret)
1350 goto fail;
1351 leaf = path.nodes[0];
1352 inode_item = btrfs_item_ptr(leaf, path.slots[0],
1353 struct btrfs_inode_item);
1354 btrfs_set_inode_size(leaf, inode_item, strlen(name) * 2 +
1355 btrfs_inode_size(leaf, inode_item));
1356 btrfs_mark_buffer_dirty(leaf);
1357 btrfs_release_path(&path);
1358 ret = btrfs_commit_transaction(trans, root);
1359 BUG_ON(ret);
1360 fail:
1361 btrfs_release_path(&path);
1362 return ret;
1363 }
1364
1365 static struct btrfs_root * link_subvol(struct btrfs_root *root,
1366 const char *base, u64 root_objectid)
1367 {
1368 struct btrfs_trans_handle *trans;
1369 struct btrfs_fs_info *fs_info = root->fs_info;
1370 struct btrfs_root *tree_root = fs_info->tree_root;
1371 struct btrfs_root *new_root = NULL;
1372 struct btrfs_path *path;
1373 struct btrfs_inode_item *inode_item;
1374 struct extent_buffer *leaf;
1375 struct btrfs_key key;
1376 u64 dirid = btrfs_root_dirid(&root->root_item);
1377 u64 index = 2;
1378 char buf[BTRFS_NAME_LEN + 1]; /* for snprintf null */
1379 int len;
1380 int i;
1381 int ret;
1382
1383 len = strlen(base);
1384 if (len < 1 || len > BTRFS_NAME_LEN)
1385 return NULL;
1386
1387 path = btrfs_alloc_path();
1388 BUG_ON(!path);
1389
1390 key.objectid = dirid;
1391 key.type = BTRFS_DIR_INDEX_KEY;
1392 key.offset = (u64)-1;
1393
1394 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1395 BUG_ON(ret <= 0);
1396
1397 if (path->slots[0] > 0) {
1398 path->slots[0]--;
1399 btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
1400 if (key.objectid == dirid && key.type == BTRFS_DIR_INDEX_KEY)
1401 index = key.offset + 1;
1402 }
1403 btrfs_release_path(path);
1404
1405 trans = btrfs_start_transaction(root, 1);
1406 BUG_ON(!trans);
1407
1408 key.objectid = dirid;
1409 key.offset = 0;
1410 key.type = BTRFS_INODE_ITEM_KEY;
1411
1412 ret = btrfs_lookup_inode(trans, root, path, &key, 1);
1413 BUG_ON(ret);
1414 leaf = path->nodes[0];
1415 inode_item = btrfs_item_ptr(leaf, path->slots[0],
1416 struct btrfs_inode_item);
1417
1418 key.objectid = root_objectid;
1419 key.offset = (u64)-1;
1420 key.type = BTRFS_ROOT_ITEM_KEY;
1421
1422 memcpy(buf, base, len);
1423 for (i = 0; i < 1024; i++) {
1424 ret = btrfs_insert_dir_item(trans, root, buf, len,
1425 dirid, &key, BTRFS_FT_DIR, index);
1426 if (ret != -EEXIST)
1427 break;
1428 len = snprintf(buf, ARRAY_SIZE(buf), "%s%d", base, i);
1429 if (len < 1 || len > BTRFS_NAME_LEN) {
1430 ret = -EINVAL;
1431 break;
1432 }
1433 }
1434 if (ret)
1435 goto fail;
1436
1437 btrfs_set_inode_size(leaf, inode_item, len * 2 +
1438 btrfs_inode_size(leaf, inode_item));
1439 btrfs_mark_buffer_dirty(leaf);
1440 btrfs_release_path(path);
1441
1442 /* add the backref first */
1443 ret = btrfs_add_root_ref(trans, tree_root, root_objectid,
1444 BTRFS_ROOT_BACKREF_KEY,
1445 root->root_key.objectid,
1446 dirid, index, buf, len);
1447 BUG_ON(ret);
1448
1449 /* now add the forward ref */
1450 ret = btrfs_add_root_ref(trans, tree_root, root->root_key.objectid,
1451 BTRFS_ROOT_REF_KEY, root_objectid,
1452 dirid, index, buf, len);
1453
1454 ret = btrfs_commit_transaction(trans, root);
1455 BUG_ON(ret);
1456
1457 new_root = btrfs_read_fs_root(fs_info, &key);
1458 if (IS_ERR(new_root))
1459 new_root = NULL;
1460 fail:
1461 btrfs_free_path(path);
1462 return new_root;
1463 }
1464
1465 static int create_chunk_mapping(struct btrfs_trans_handle *trans,
1466 struct btrfs_root *root)
1467 {
1468 struct btrfs_fs_info *info = root->fs_info;
1469 struct btrfs_root *chunk_root = info->chunk_root;
1470 struct btrfs_root *extent_root = info->extent_root;
1471 struct btrfs_device *device;
1472 struct btrfs_block_group_cache *cache;
1473 struct btrfs_dev_extent *extent;
1474 struct extent_buffer *leaf;
1475 struct btrfs_chunk chunk;
1476 struct btrfs_key key;
1477 struct btrfs_path path;
1478 u64 cur_start;
1479 u64 total_bytes;
1480 u64 chunk_objectid;
1481 int ret;
1482
1483 btrfs_init_path(&path);
1484
1485 total_bytes = btrfs_super_total_bytes(root->fs_info->super_copy);
1486 chunk_objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID;
1487
1488 BUG_ON(list_empty(&info->fs_devices->devices));
1489 device = list_entry(info->fs_devices->devices.next,
1490 struct btrfs_device, dev_list);
1491 BUG_ON(device->devid != info->fs_devices->latest_devid);
1492
1493 /* delete device extent created by make_btrfs */
1494 key.objectid = device->devid;
1495 key.offset = 0;
1496 key.type = BTRFS_DEV_EXTENT_KEY;
1497 ret = btrfs_search_slot(trans, device->dev_root, &key, &path, -1, 1);
1498 if (ret < 0)
1499 goto err;
1500
1501 BUG_ON(ret > 0);
1502 ret = btrfs_del_item(trans, device->dev_root, &path);
1503 if (ret)
1504 goto err;
1505 btrfs_release_path(&path);
1506
1507 /* delete chunk item created by make_btrfs */
1508 key.objectid = chunk_objectid;
1509 key.offset = 0;
1510 key.type = BTRFS_CHUNK_ITEM_KEY;
1511 ret = btrfs_search_slot(trans, chunk_root, &key, &path, -1, 1);
1512 if (ret < 0)
1513 goto err;
1514
1515 BUG_ON(ret > 0);
1516 ret = btrfs_del_item(trans, chunk_root, &path);
1517 if (ret)
1518 goto err;
1519 btrfs_release_path(&path);
1520
1521 /* for each block group, create device extent and chunk item */
1522 cur_start = 0;
1523 while (cur_start < total_bytes) {
1524 cache = btrfs_lookup_block_group(root->fs_info, cur_start);
1525 BUG_ON(!cache);
1526
1527 /* insert device extent */
1528 key.objectid = device->devid;
1529 key.offset = cache->key.objectid;
1530 key.type = BTRFS_DEV_EXTENT_KEY;
1531 ret = btrfs_insert_empty_item(trans, device->dev_root, &path,
1532 &key, sizeof(*extent));
1533 if (ret)
1534 goto err;
1535
1536 leaf = path.nodes[0];
1537 extent = btrfs_item_ptr(leaf, path.slots[0],
1538 struct btrfs_dev_extent);
1539
1540 btrfs_set_dev_extent_chunk_tree(leaf, extent,
1541 chunk_root->root_key.objectid);
1542 btrfs_set_dev_extent_chunk_objectid(leaf, extent,
1543 chunk_objectid);
1544 btrfs_set_dev_extent_chunk_offset(leaf, extent,
1545 cache->key.objectid);
1546 btrfs_set_dev_extent_length(leaf, extent, cache->key.offset);
1547 write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid,
1548 (unsigned long)btrfs_dev_extent_chunk_tree_uuid(extent),
1549 BTRFS_UUID_SIZE);
1550 btrfs_mark_buffer_dirty(leaf);
1551 btrfs_release_path(&path);
1552
1553 /* insert chunk item */
1554 btrfs_set_stack_chunk_length(&chunk, cache->key.offset);
1555 btrfs_set_stack_chunk_owner(&chunk,
1556 extent_root->root_key.objectid);
1557 btrfs_set_stack_chunk_stripe_len(&chunk, BTRFS_STRIPE_LEN);
1558 btrfs_set_stack_chunk_type(&chunk, cache->flags);
1559 btrfs_set_stack_chunk_io_align(&chunk, device->io_align);
1560 btrfs_set_stack_chunk_io_width(&chunk, device->io_width);
1561 btrfs_set_stack_chunk_sector_size(&chunk, device->sector_size);
1562 btrfs_set_stack_chunk_num_stripes(&chunk, 1);
1563 btrfs_set_stack_chunk_sub_stripes(&chunk, 0);
1564 btrfs_set_stack_stripe_devid(&chunk.stripe, device->devid);
1565 btrfs_set_stack_stripe_offset(&chunk.stripe,
1566 cache->key.objectid);
1567 memcpy(&chunk.stripe.dev_uuid, device->uuid, BTRFS_UUID_SIZE);
1568
1569 key.objectid = chunk_objectid;
1570 key.offset = cache->key.objectid;
1571 key.type = BTRFS_CHUNK_ITEM_KEY;
1572
1573 ret = btrfs_insert_item(trans, chunk_root, &key, &chunk,
1574 btrfs_chunk_item_size(1));
1575 if (ret)
1576 goto err;
1577
1578 cur_start = cache->key.objectid + cache->key.offset;
1579 }
1580
1581 device->bytes_used = total_bytes;
1582 ret = btrfs_update_device(trans, device);
1583 err:
1584 btrfs_release_path(&path);
1585 return ret;
1586 }
1587
1588 static int create_subvol(struct btrfs_trans_handle *trans,
1589 struct btrfs_root *root, u64 root_objectid)
1590 {
1591 struct extent_buffer *tmp;
1592 struct btrfs_root *new_root;
1593 struct btrfs_key key;
1594 struct btrfs_root_item root_item;
1595 int ret;
1596
1597 ret = btrfs_copy_root(trans, root, root->node, &tmp,
1598 root_objectid);
1599 BUG_ON(ret);
1600
1601 memcpy(&root_item, &root->root_item, sizeof(root_item));
1602 btrfs_set_root_bytenr(&root_item, tmp->start);
1603 btrfs_set_root_level(&root_item, btrfs_header_level(tmp));
1604 btrfs_set_root_generation(&root_item, trans->transid);
1605 free_extent_buffer(tmp);
1606
1607 key.objectid = root_objectid;
1608 key.type = BTRFS_ROOT_ITEM_KEY;
1609 key.offset = trans->transid;
1610 ret = btrfs_insert_root(trans, root->fs_info->tree_root,
1611 &key, &root_item);
1612
1613 key.offset = (u64)-1;
1614 new_root = btrfs_read_fs_root(root->fs_info, &key);
1615 BUG_ON(!new_root || IS_ERR(new_root));
1616
1617 ret = btrfs_make_root_dir(trans, new_root, BTRFS_FIRST_FREE_OBJECTID);
1618 BUG_ON(ret);
1619
1620 return 0;
1621 }
1622
1623 static int init_btrfs(struct btrfs_root *root)
1624 {
1625 int ret;
1626 struct btrfs_key location;
1627 struct btrfs_trans_handle *trans;
1628 struct btrfs_fs_info *fs_info = root->fs_info;
1629 struct extent_buffer *tmp;
1630
1631 trans = btrfs_start_transaction(root, 1);
1632 BUG_ON(!trans);
1633 ret = btrfs_make_block_groups(trans, root);
1634 if (ret)
1635 goto err;
1636 ret = btrfs_fix_block_accounting(trans, root);
1637 if (ret)
1638 goto err;
1639 ret = create_chunk_mapping(trans, root);
1640 if (ret)
1641 goto err;
1642 ret = btrfs_make_root_dir(trans, fs_info->tree_root,
1643 BTRFS_ROOT_TREE_DIR_OBJECTID);
1644 if (ret)
1645 goto err;
1646 memcpy(&location, &root->root_key, sizeof(location));
1647 location.offset = (u64)-1;
1648 ret = btrfs_insert_dir_item(trans, fs_info->tree_root, "default", 7,
1649 btrfs_super_root_dir(fs_info->super_copy),
1650 &location, BTRFS_FT_DIR, 0);
1651 if (ret)
1652 goto err;
1653 ret = btrfs_insert_inode_ref(trans, fs_info->tree_root, "default", 7,
1654 location.objectid,
1655 btrfs_super_root_dir(fs_info->super_copy), 0);
1656 if (ret)
1657 goto err;
1658 btrfs_set_root_dirid(&fs_info->fs_root->root_item,
1659 BTRFS_FIRST_FREE_OBJECTID);
1660
1661 /* subvol for ext2 image file */
1662 ret = create_subvol(trans, root, EXT2_IMAGE_SUBVOL_OBJECTID);
1663 BUG_ON(ret);
1664 /* subvol for data relocation */
1665 ret = create_subvol(trans, root, BTRFS_DATA_RELOC_TREE_OBJECTID);
1666 BUG_ON(ret);
1667
1668 extent_buffer_get(fs_info->csum_root->node);
1669 ret = __btrfs_cow_block(trans, fs_info->csum_root,
1670 fs_info->csum_root->node, NULL, 0, &tmp, 0, 0);
1671 BUG_ON(ret);
1672 free_extent_buffer(tmp);
1673
1674 ret = btrfs_commit_transaction(trans, root);
1675 BUG_ON(ret);
1676 err:
1677 return ret;
1678 }
1679
1680 /*
1681 * Migrate super block to its default position and zero 0 ~ 16k
1682 */
1683 static int migrate_super_block(int fd, u64 old_bytenr, u32 sectorsize)
1684 {
1685 int ret;
1686 struct extent_buffer *buf;
1687 struct btrfs_super_block *super;
1688 u32 len;
1689 u32 bytenr;
1690
1691 BUG_ON(sectorsize < sizeof(*super));
1692 buf = malloc(sizeof(*buf) + sectorsize);
1693 if (!buf)
1694 return -ENOMEM;
1695
1696 buf->len = sectorsize;
1697 ret = pread(fd, buf->data, sectorsize, old_bytenr);
1698 if (ret != sectorsize)
1699 goto fail;
1700
1701 super = (struct btrfs_super_block *)buf->data;
1702 BUG_ON(btrfs_super_bytenr(super) != old_bytenr);
1703 btrfs_set_super_bytenr(super, BTRFS_SUPER_INFO_OFFSET);
1704
1705 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
1706 ret = pwrite(fd, buf->data, sectorsize, BTRFS_SUPER_INFO_OFFSET);
1707 if (ret != sectorsize)
1708 goto fail;
1709
1710 ret = fsync(fd);
1711 if (ret)
1712 goto fail;
1713
1714 memset(buf->data, 0, sectorsize);
1715 for (bytenr = 0; bytenr < BTRFS_SUPER_INFO_OFFSET; ) {
1716 len = BTRFS_SUPER_INFO_OFFSET - bytenr;
1717 if (len > sectorsize)
1718 len = sectorsize;
1719 ret = pwrite(fd, buf->data, len, bytenr);
1720 if (ret != len) {
1721 fprintf(stderr, "unable to zero fill device\n");
1722 break;
1723 }
1724 bytenr += len;
1725 }
1726 ret = 0;
1727 fsync(fd);
1728 fail:
1729 free(buf);
1730 if (ret > 0)
1731 ret = -1;
1732 return ret;
1733 }
1734
1735 static int prepare_system_chunk_sb(struct btrfs_super_block *super)
1736 {
1737 struct btrfs_chunk *chunk;
1738 struct btrfs_disk_key *key;
1739 u32 sectorsize = btrfs_super_sectorsize(super);
1740
1741 key = (struct btrfs_disk_key *)(super->sys_chunk_array);
1742 chunk = (struct btrfs_chunk *)(super->sys_chunk_array +
1743 sizeof(struct btrfs_disk_key));
1744
1745 btrfs_set_disk_key_objectid(key, BTRFS_FIRST_CHUNK_TREE_OBJECTID);
1746 btrfs_set_disk_key_type(key, BTRFS_CHUNK_ITEM_KEY);
1747 btrfs_set_disk_key_offset(key, 0);
1748
1749 btrfs_set_stack_chunk_length(chunk, btrfs_super_total_bytes(super));
1750 btrfs_set_stack_chunk_owner(chunk, BTRFS_EXTENT_TREE_OBJECTID);
1751 btrfs_set_stack_chunk_stripe_len(chunk, BTRFS_STRIPE_LEN);
1752 btrfs_set_stack_chunk_type(chunk, BTRFS_BLOCK_GROUP_SYSTEM);
1753 btrfs_set_stack_chunk_io_align(chunk, sectorsize);
1754 btrfs_set_stack_chunk_io_width(chunk, sectorsize);
1755 btrfs_set_stack_chunk_sector_size(chunk, sectorsize);
1756 btrfs_set_stack_chunk_num_stripes(chunk, 1);
1757 btrfs_set_stack_chunk_sub_stripes(chunk, 0);
1758 chunk->stripe.devid = super->dev_item.devid;
1759 btrfs_set_stack_stripe_offset(&chunk->stripe, 0);
1760 memcpy(chunk->stripe.dev_uuid, super->dev_item.uuid, BTRFS_UUID_SIZE);
1761 btrfs_set_super_sys_array_size(super, sizeof(*key) + sizeof(*chunk));
1762 return 0;
1763 }
1764
1765 static int prepare_system_chunk(int fd, u64 sb_bytenr, u32 sectorsize)
1766 {
1767 int ret;
1768 struct extent_buffer *buf;
1769 struct btrfs_super_block *super;
1770
1771 BUG_ON(sectorsize < sizeof(*super));
1772 buf = malloc(sizeof(*buf) + sectorsize);
1773 if (!buf)
1774 return -ENOMEM;
1775
1776 buf->len = sectorsize;
1777 ret = pread(fd, buf->data, sectorsize, sb_bytenr);
1778 if (ret != sectorsize)
1779 goto fail;
1780
1781 super = (struct btrfs_super_block *)buf->data;
1782 BUG_ON(btrfs_super_bytenr(super) != sb_bytenr);
1783 BUG_ON(btrfs_super_num_devices(super) != 1);
1784
1785 ret = prepare_system_chunk_sb(super);
1786 if (ret)
1787 goto fail;
1788
1789 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
1790 ret = pwrite(fd, buf->data, sectorsize, sb_bytenr);
1791 if (ret != sectorsize)
1792 goto fail;
1793
1794 ret = 0;
1795 fail:
1796 free(buf);
1797 if (ret > 0)
1798 ret = -1;
1799 return ret;
1800 }
1801
1802 static int relocate_one_reference(struct btrfs_trans_handle *trans,
1803 struct btrfs_root *root,
1804 u64 extent_start, u64 extent_size,
1805 struct btrfs_key *extent_key,
1806 struct extent_io_tree *reloc_tree)
1807 {
1808 struct extent_buffer *leaf;
1809 struct btrfs_file_extent_item *fi;
1810 struct btrfs_key key;
1811 struct btrfs_path path;
1812 struct btrfs_inode_item inode;
1813 struct blk_iterate_data data;
1814 u64 bytenr;
1815 u64 num_bytes;
1816 u64 cur_offset;
1817 u64 new_pos;
1818 u64 nbytes;
1819 u64 sector_end;
1820 u32 sectorsize = root->sectorsize;
1821 unsigned long ptr;
1822 int datacsum;
1823 int fd;
1824 int ret;
1825
1826 btrfs_init_path(&path);
1827 ret = btrfs_search_slot(trans, root, extent_key, &path, -1, 1);
1828 if (ret)
1829 goto fail;
1830
1831 leaf = path.nodes[0];
1832 fi = btrfs_item_ptr(leaf, path.slots[0],
1833 struct btrfs_file_extent_item);
1834 BUG_ON(btrfs_file_extent_offset(leaf, fi) > 0);
1835 if (extent_start != btrfs_file_extent_disk_bytenr(leaf, fi) ||
1836 extent_size != btrfs_file_extent_disk_num_bytes(leaf, fi)) {
1837 ret = 1;
1838 goto fail;
1839 }
1840
1841 bytenr = extent_start + btrfs_file_extent_offset(leaf, fi);
1842 num_bytes = btrfs_file_extent_num_bytes(leaf, fi);
1843
1844 ret = btrfs_del_item(trans, root, &path);
1845 if (ret)
1846 goto fail;
1847
1848 ret = btrfs_free_extent(trans, root, extent_start, extent_size, 0,
1849 root->root_key.objectid,
1850 extent_key->objectid, extent_key->offset);
1851 if (ret)
1852 goto fail;
1853
1854 btrfs_release_path(&path);
1855
1856 key.objectid = extent_key->objectid;
1857 key.offset = 0;
1858 key.type = BTRFS_INODE_ITEM_KEY;
1859 ret = btrfs_lookup_inode(trans, root, &path, &key, 0);
1860 if (ret)
1861 goto fail;
1862
1863 leaf = path.nodes[0];
1864 ptr = btrfs_item_ptr_offset(leaf, path.slots[0]);
1865 read_extent_buffer(leaf, &inode, ptr, sizeof(inode));
1866 btrfs_release_path(&path);
1867
1868 BUG_ON(num_bytes & (sectorsize - 1));
1869 nbytes = btrfs_stack_inode_nbytes(&inode) - num_bytes;
1870 btrfs_set_stack_inode_nbytes(&inode, nbytes);
1871 datacsum = !(btrfs_stack_inode_flags(&inode) & BTRFS_INODE_NODATASUM);
1872
1873 data = (struct blk_iterate_data) {
1874 .trans = trans,
1875 .root = root,
1876 .inode = &inode,
1877 .objectid = extent_key->objectid,
1878 .first_block = extent_key->offset / sectorsize,
1879 .disk_block = 0,
1880 .num_blocks = 0,
1881 .boundary = (u64)-1,
1882 .checksum = datacsum,
1883 .errcode = 0,
1884 };
1885
1886 cur_offset = extent_key->offset;
1887 while (num_bytes > 0) {
1888 sector_end = bytenr + sectorsize - 1;
1889 if (test_range_bit(reloc_tree, bytenr, sector_end,
1890 EXTENT_LOCKED, 1)) {
1891 ret = get_state_private(reloc_tree, bytenr, &new_pos);
1892 BUG_ON(ret);
1893 } else {
1894 ret = custom_alloc_extent(root, sectorsize, 0, &key);
1895 if (ret)
1896 goto fail;
1897 new_pos = key.objectid;
1898
1899 if (cur_offset == extent_key->offset) {
1900 fd = root->fs_info->fs_devices->latest_bdev;
1901 readahead(fd, bytenr, num_bytes);
1902 }
1903 ret = copy_disk_extent(root, new_pos, bytenr,
1904 sectorsize);
1905 if (ret)
1906 goto fail;
1907 ret = set_extent_bits(reloc_tree, bytenr, sector_end,
1908 EXTENT_LOCKED, GFP_NOFS);
1909 BUG_ON(ret);
1910 ret = set_state_private(reloc_tree, bytenr, new_pos);
1911 BUG_ON(ret);
1912 }
1913
1914 ret = block_iterate_proc(NULL, new_pos / sectorsize,
1915 cur_offset / sectorsize, &data);
1916 if (ret & BLOCK_ABORT) {
1917 ret = data.errcode;
1918 goto fail;
1919 }
1920
1921 cur_offset += sectorsize;
1922 bytenr += sectorsize;
1923 num_bytes -= sectorsize;
1924 }
1925
1926 if (data.num_blocks > 0) {
1927 ret = record_file_blocks(trans, root,
1928 extent_key->objectid, &inode,
1929 data.first_block, data.disk_block,
1930 data.num_blocks, datacsum);
1931 if (ret)
1932 goto fail;
1933 }
1934
1935 key.objectid = extent_key->objectid;
1936 key.offset = 0;
1937 key.type = BTRFS_INODE_ITEM_KEY;
1938 ret = btrfs_lookup_inode(trans, root, &path, &key, 1);
1939 if (ret)
1940 goto fail;
1941
1942 leaf = path.nodes[0];
1943 ptr = btrfs_item_ptr_offset(leaf, path.slots[0]);
1944 write_extent_buffer(leaf, &inode, ptr, sizeof(inode));
1945 btrfs_mark_buffer_dirty(leaf);
1946 btrfs_release_path(&path);
1947
1948 fail:
1949 btrfs_release_path(&path);
1950 return ret;
1951 }
1952
1953 static int relocate_extents_range(struct btrfs_root *fs_root,
1954 struct btrfs_root *ext2_root,
1955 u64 start_byte, u64 end_byte)
1956 {
1957 struct btrfs_fs_info *info = fs_root->fs_info;
1958 struct btrfs_root *extent_root = info->extent_root;
1959 struct btrfs_root *cur_root = NULL;
1960 struct btrfs_trans_handle *trans;
1961 struct btrfs_extent_data_ref *dref;
1962 struct btrfs_extent_inline_ref *iref;
1963 struct btrfs_extent_item *ei;
1964 struct extent_buffer *leaf;
1965 struct btrfs_key key;
1966 struct btrfs_key extent_key;
1967 struct btrfs_path path;
1968 struct extent_io_tree reloc_tree;
1969 unsigned long ptr;
1970 unsigned long end;
1971 u64 cur_byte;
1972 u64 num_bytes;
1973 u64 ref_root;
1974 u64 num_extents;
1975 int pass = 0;
1976 int ret;
1977
1978 btrfs_init_path(&path);
1979 extent_io_tree_init(&reloc_tree);
1980
1981 key.objectid = start_byte;
1982 key.offset = 0;
1983 key.type = BTRFS_EXTENT_ITEM_KEY;
1984 ret = btrfs_search_slot(NULL, extent_root, &key, &path, 0, 0);
1985 if (ret < 0)
1986 goto fail;
1987 if (ret > 0) {
1988 ret = btrfs_previous_item(extent_root, &path, 0,
1989 BTRFS_EXTENT_ITEM_KEY);
1990 if (ret < 0)
1991 goto fail;
1992 if (ret == 0) {
1993 leaf = path.nodes[0];
1994 btrfs_item_key_to_cpu(leaf, &key, path.slots[0]);
1995 if (key.objectid + key.offset > start_byte)
1996 start_byte = key.objectid;
1997 }
1998 }
1999 btrfs_release_path(&path);
2000 again:
2001 cur_root = (pass % 2 == 0) ? ext2_root : fs_root;
2002 num_extents = 0;
2003
2004 trans = btrfs_start_transaction(cur_root, 1);
2005 BUG_ON(!trans);
2006
2007 cur_byte = start_byte;
2008 while (1) {
2009 key.objectid = cur_byte;
2010 key.offset = 0;
2011 key.type = BTRFS_EXTENT_ITEM_KEY;
2012 ret = btrfs_search_slot(trans, extent_root,
2013 &key, &path, 0, 0);
2014 if (ret < 0)
2015 goto fail;
2016 next:
2017 leaf = path.nodes[0];
2018 if (path.slots[0] >= btrfs_header_nritems(leaf)) {
2019 ret = btrfs_next_leaf(extent_root, &path);
2020 if (ret < 0)
2021 goto fail;
2022 if (ret > 0)
2023 break;
2024 leaf = path.nodes[0];
2025 }
2026
2027 btrfs_item_key_to_cpu(leaf, &key, path.slots[0]);
2028 if (key.objectid < cur_byte ||
2029 key.type != BTRFS_EXTENT_ITEM_KEY) {
2030 path.slots[0]++;
2031 goto next;
2032 }
2033 if (key.objectid >= end_byte)
2034 break;
2035
2036 num_extents++;
2037
2038 cur_byte = key.objectid;
2039 num_bytes = key.offset;
2040 ei = btrfs_item_ptr(leaf, path.slots[0],
2041 struct btrfs_extent_item);
2042 BUG_ON(!(btrfs_extent_flags(leaf, ei) &
2043 BTRFS_EXTENT_FLAG_DATA));
2044
2045 ptr = btrfs_item_ptr_offset(leaf, path.slots[0]);
2046 end = ptr + btrfs_item_size_nr(leaf, path.slots[0]);
2047
2048 ptr += sizeof(struct btrfs_extent_item);
2049
2050 while (ptr < end) {
2051 iref = (struct btrfs_extent_inline_ref *)ptr;
2052 key.type = btrfs_extent_inline_ref_type(leaf, iref);
2053 BUG_ON(key.type != BTRFS_EXTENT_DATA_REF_KEY);
2054 dref = (struct btrfs_extent_data_ref *)(&iref->offset);
2055 ref_root = btrfs_extent_data_ref_root(leaf, dref);
2056 extent_key.objectid =
2057 btrfs_extent_data_ref_objectid(leaf, dref);
2058 extent_key.offset =
2059 btrfs_extent_data_ref_offset(leaf, dref);
2060 extent_key.type = BTRFS_EXTENT_DATA_KEY;
2061 BUG_ON(btrfs_extent_data_ref_count(leaf, dref) != 1);
2062
2063 if (ref_root == cur_root->root_key.objectid)
2064 break;
2065
2066 ptr += btrfs_extent_inline_ref_size(key.type);
2067 }
2068
2069 if (ptr >= end) {
2070 path.slots[0]++;
2071 goto next;
2072 }
2073
2074 ret = relocate_one_reference(trans, cur_root, cur_byte,
2075 num_bytes, &extent_key,
2076 &reloc_tree);
2077 if (ret < 0)
2078 goto fail;
2079
2080 cur_byte += num_bytes;
2081 btrfs_release_path(&path);
2082
2083 if (trans->blocks_used >= 4096) {
2084 ret = btrfs_commit_transaction(trans, cur_root);
2085 BUG_ON(ret);
2086 trans = btrfs_start_transaction(cur_root, 1);
2087 BUG_ON(!trans);
2088 }
2089 }
2090 btrfs_release_path(&path);
2091
2092 ret = btrfs_commit_transaction(trans, cur_root);
2093 BUG_ON(ret);
2094
2095 if (num_extents > 0 && pass++ < 16)
2096 goto again;
2097
2098 ret = (num_extents > 0) ? -1 : 0;
2099 fail:
2100 btrfs_release_path(&path);
2101 extent_io_tree_cleanup(&reloc_tree);
2102 return ret;
2103 }
2104
2105 /*
2106 * relocate data in system chunk
2107 */
2108 static int cleanup_sys_chunk(struct btrfs_root *fs_root,
2109 struct btrfs_root *ext2_root)
2110 {
2111 struct btrfs_block_group_cache *cache;
2112 int i, ret = 0;
2113 u64 offset = 0;
2114 u64 end_byte;
2115
2116 while(1) {
2117 cache = btrfs_lookup_block_group(fs_root->fs_info, offset);
2118 if (!cache)
2119 break;
2120
2121 end_byte = cache->key.objectid + cache->key.offset;
2122 if (cache->flags & BTRFS_BLOCK_GROUP_SYSTEM) {
2123 ret = relocate_extents_range(fs_root, ext2_root,
2124 cache->key.objectid,
2125 end_byte);
2126 if (ret)
2127 goto fail;
2128 }
2129 offset = end_byte;
2130 }
2131 for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
2132 offset = btrfs_sb_offset(i);
2133 offset &= ~((u64)BTRFS_STRIPE_LEN - 1);
2134
2135 ret = relocate_extents_range(fs_root, ext2_root,
2136 offset, offset + BTRFS_STRIPE_LEN);
2137 if (ret)
2138 goto fail;
2139 }
2140 ret = 0;
2141 fail:
2142 return ret;
2143 }
2144
2145 static int fixup_chunk_mapping(struct btrfs_root *root)
2146 {
2147 struct btrfs_trans_handle *trans;
2148 struct btrfs_fs_info *info = root->fs_info;
2149 struct btrfs_root *chunk_root = info->chunk_root;
2150 struct extent_buffer *leaf;
2151 struct btrfs_key key;
2152 struct btrfs_path path;
2153 struct btrfs_chunk chunk;
2154 unsigned long ptr;
2155 u32 size;
2156 u64 type;
2157 int ret;
2158
2159 btrfs_init_path(&path);
2160
2161 trans = btrfs_start_transaction(root, 1);
2162 BUG_ON(!trans);
2163
2164 /*
2165 * recow the whole chunk tree. this will move all chunk tree blocks
2166 * into system block group.
2167 */
2168 memset(&key, 0, sizeof(key));
2169 while (1) {
2170 ret = btrfs_search_slot(trans, chunk_root, &key, &path, 0, 1);
2171 if (ret < 0)
2172 goto err;
2173
2174 ret = btrfs_next_leaf(chunk_root, &path);
2175 if (ret < 0)
2176 goto err;
2177 if (ret > 0)
2178 break;
2179
2180 btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]);
2181 btrfs_release_path(&path);
2182 }
2183 btrfs_release_path(&path);
2184
2185 /* fixup the system chunk array in super block */
2186 btrfs_set_super_sys_array_size(info->super_copy, 0);
2187
2188 key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID;
2189 key.offset = 0;
2190 key.type = BTRFS_CHUNK_ITEM_KEY;
2191
2192 ret = btrfs_search_slot(trans, chunk_root, &key, &path, 0, 0);
2193 if (ret < 0)
2194 goto err;
2195 BUG_ON(ret != 0);
2196 while(1) {
2197 leaf = path.nodes[0];
2198 if (path.slots[0] >= btrfs_header_nritems(leaf)) {
2199 ret = btrfs_next_leaf(chunk_root, &path);
2200 if (ret < 0)
2201 goto err;
2202 if (ret > 0)
2203 break;
2204 leaf = path.nodes[0];
2205 }
2206 btrfs_item_key_to_cpu(leaf, &key, path.slots[0]);
2207 if (key.type != BTRFS_CHUNK_ITEM_KEY)
2208 goto next;
2209
2210 ptr = btrfs_item_ptr_offset(leaf, path.slots[0]);
2211 size = btrfs_item_size_nr(leaf, path.slots[0]);
2212 BUG_ON(size != sizeof(chunk));
2213 read_extent_buffer(leaf, &chunk, ptr, size);
2214 type = btrfs_stack_chunk_type(&chunk);
2215
2216 if (!(type & BTRFS_BLOCK_GROUP_SYSTEM))
2217 goto next;
2218
2219 ret = btrfs_add_system_chunk(trans, chunk_root, &key,
2220 &chunk, size);
2221 if (ret)
2222 goto err;
2223 next:
2224 path.slots[0]++;
2225 }
2226
2227 ret = btrfs_commit_transaction(trans, root);
2228 BUG_ON(ret);
2229 err:
2230 btrfs_release_path(&path);
2231 return ret;
2232 }
2233
2234 static int do_convert(const char *devname, int datacsum, int packing, int noxattr,
2235 int copylabel, const char *fslabel, int progress)
2236 {
2237 int i, ret;
2238 int fd = -1;
2239 u32 blocksize;
2240 u64 blocks[7];
2241 u64 total_bytes;
2242 u64 super_bytenr;
2243 ext2_filsys ext2_fs;
2244 struct btrfs_root *root;
2245 struct btrfs_root *ext2_root;
2246 struct task_ctx ctx;
2247
2248 ret = open_ext2fs(devname, &ext2_fs);
2249 if (ret) {
2250 fprintf(stderr, "unable to open the Ext2fs\n");
2251 goto fail;
2252 }
2253 blocksize = ext2_fs->blocksize;
2254 total_bytes = (u64)ext2_fs->super->s_blocks_count * blocksize;
2255 if (blocksize < 4096) {
2256 fprintf(stderr, "block size is too small\n");
2257 goto fail;
2258 }
2259 if (!(ext2_fs->super->s_feature_incompat &
2260 EXT2_FEATURE_INCOMPAT_FILETYPE)) {
2261 fprintf(stderr, "filetype feature is missing\n");
2262 goto fail;
2263 }
2264 for (i = 0; i < 7; i++) {
2265 ret = ext2_alloc_block(ext2_fs, 0, blocks + i);
2266 if (ret) {
2267 fprintf(stderr, "not enough free space\n");
2268 goto fail;
2269 }
2270 blocks[i] *= blocksize;
2271 }
2272 super_bytenr = blocks[0];
2273 fd = open(devname, O_RDWR);
2274 if (fd < 0) {
2275 fprintf(stderr, "unable to open %s\n", devname);
2276 goto fail;
2277 }
2278 ret = make_btrfs(fd, devname, ext2_fs->super->s_volume_name,
2279 NULL, blocks, total_bytes, blocksize, blocksize,
2280 blocksize, blocksize, 0);
2281 if (ret) {
2282 fprintf(stderr, "unable to create initial ctree: %s\n",
2283 strerror(-ret));
2284 goto fail;
2285 }
2286 /* create a system chunk that maps the whole device */
2287 ret = prepare_system_chunk(fd, super_bytenr, blocksize);
2288 if (ret) {
2289 fprintf(stderr, "unable to update system chunk\n");
2290 goto fail;
2291 }
2292 root = open_ctree_fd(fd, devname, super_bytenr, OPEN_CTREE_WRITES);
2293 if (!root) {
2294 fprintf(stderr, "unable to open ctree\n");
2295 goto fail;
2296 }
2297 ret = cache_free_extents(root, ext2_fs);
2298 if (ret) {
2299 fprintf(stderr, "error during cache_free_extents %d\n", ret);
2300 goto fail;
2301 }
2302 root->fs_info->extent_ops = &extent_ops;
2303 /* recover block allocation bitmap */
2304 for (i = 0; i < 7; i++) {
2305 blocks[i] /= blocksize;
2306 ext2_free_block(ext2_fs, blocks[i]);
2307 }
2308 ret = init_btrfs(root);
2309 if (ret) {
2310 fprintf(stderr, "unable to setup the root tree\n");
2311 goto fail;
2312 }
2313 printf("creating btrfs metadata.\n");
2314 ctx.max_copy_inodes = (ext2_fs->super->s_inodes_count
2315 - ext2_fs->super->s_free_inodes_count);
2316 ctx.cur_copy_inodes = 0;
2317
2318 if (progress) {
2319 ctx.info = task_init(print_copied_inodes, after_copied_inodes, &ctx);
2320 task_start(ctx.info);
2321 }
2322 ret = copy_inodes(root, ext2_fs, datacsum, packing, noxattr, &ctx);
2323 if (ret) {
2324 fprintf(stderr, "error during copy_inodes %d\n", ret);
2325 goto fail;
2326 }
2327 if (progress) {
2328 task_stop(ctx.info);
2329 task_deinit(ctx.info);
2330 }
2331 printf("creating ext2fs image file.\n");
2332 ext2_root = link_subvol(root, "ext2_saved", EXT2_IMAGE_SUBVOL_OBJECTID);
2333 if (!ext2_root) {
2334 fprintf(stderr, "unable to create subvol\n");
2335 goto fail;
2336 }
2337 ret = create_ext2_image(ext2_root, ext2_fs, "image");
2338 if (ret) {
2339 fprintf(stderr, "error during create_ext2_image %d\n", ret);
2340 goto fail;
2341 }
2342 memset(root->fs_info->super_copy->label, 0, BTRFS_LABEL_SIZE);
2343 if (copylabel == 1) {
2344 strncpy(root->fs_info->super_copy->label,
2345 ext2_fs->super->s_volume_name, 16);
2346 fprintf(stderr, "copy label '%s'\n",
2347 root->fs_info->super_copy->label);
2348 } else if (copylabel == -1) {
2349 strncpy(root->fs_info->super_copy->label, fslabel, BTRFS_LABEL_SIZE);
2350 fprintf(stderr, "set label to '%s'\n", fslabel);
2351 }
2352
2353 printf("cleaning up system chunk.\n");
2354 ret = cleanup_sys_chunk(root, ext2_root);
2355 if (ret) {
2356 fprintf(stderr, "error during cleanup_sys_chunk %d\n", ret);
2357 goto fail;
2358 }
2359 ret = close_ctree(root);
2360 if (ret) {
2361 fprintf(stderr, "error during close_ctree %d\n", ret);
2362 goto fail;
2363 }
2364 close_ext2fs(ext2_fs);
2365
2366 /*
2367 * If this step succeed, we get a mountable btrfs. Otherwise
2368 * the ext2fs is left unchanged.
2369 */
2370 ret = migrate_super_block(fd, super_bytenr, blocksize);
2371 if (ret) {
2372 fprintf(stderr, "unable to migrate super block\n");
2373 goto fail;
2374 }
2375
2376 root = open_ctree_fd(fd, devname, 0, OPEN_CTREE_WRITES);
2377 if (!root) {
2378 fprintf(stderr, "unable to open ctree\n");
2379 goto fail;
2380 }
2381 /* move chunk tree into system chunk. */
2382 ret = fixup_chunk_mapping(root);
2383 if (ret) {
2384 fprintf(stderr, "error during fixup_chunk_tree\n");
2385 goto fail;
2386 }
2387 ret = close_ctree(root);
2388 close(fd);
2389
2390 printf("conversion complete.\n");
2391 return 0;
2392 fail:
2393 if (fd != -1)
2394 close(fd);
2395 fprintf(stderr, "conversion aborted.\n");
2396 return -1;
2397 }
2398
2399 static int may_rollback(struct btrfs_root *root)
2400 {
2401 struct btrfs_fs_info *info = root->fs_info;
2402 struct btrfs_multi_bio *multi = NULL;
2403 u64 bytenr;
2404 u64 length;
2405 u64 physical;
2406 u64 total_bytes;
2407 int num_stripes;
2408 int ret;
2409
2410 if (btrfs_super_num_devices(info->super_copy) != 1)
2411 goto fail;
2412
2413 bytenr = BTRFS_SUPER_INFO_OFFSET;
2414 total_bytes = btrfs_super_total_bytes(root->fs_info->super_copy);
2415
2416 while (1) {
2417 ret = btrfs_map_block(&info->mapping_tree, WRITE, bytenr,
2418 &length, &multi, 0, NULL);
2419 if (ret) {
2420 if (ret == -ENOENT) {
2421 /* removed block group at the tail */
2422 if (length == (u64)-1)
2423 break;
2424
2425 /* removed block group in the middle */
2426 goto next;
2427 }
2428 goto fail;
2429 }
2430
2431 num_stripes = multi->num_stripes;
2432 physical = multi->stripes[0].physical;
2433 kfree(multi);
2434
2435 if (num_stripes != 1 || physical != bytenr)
2436 goto fail;
2437 next:
2438 bytenr += length;
2439 if (bytenr >= total_bytes)
2440 break;
2441 }
2442 return 0;
2443 fail:
2444 return -1;
2445 }
2446
2447 static int do_rollback(const char *devname)
2448 {
2449 int fd = -1;
2450 int ret;
2451 int i;
2452 struct btrfs_root *root;
2453 struct btrfs_root *ext2_root;
2454 struct btrfs_root *chunk_root;
2455 struct btrfs_dir_item *dir;
2456 struct btrfs_inode_item *inode;
2457 struct btrfs_file_extent_item *fi;
2458 struct btrfs_trans_handle *trans;
2459 struct extent_buffer *leaf;
2460 struct btrfs_block_group_cache *cache1;
2461 struct btrfs_block_group_cache *cache2;
2462 struct btrfs_key key;
2463 struct btrfs_path path;
2464 struct extent_io_tree io_tree;
2465 char *buf = NULL;
2466 char *name;
2467 u64 bytenr;
2468 u64 num_bytes;
2469 u64 root_dir;
2470 u64 objectid;
2471 u64 offset;
2472 u64 start;
2473 u64 end;
2474 u64 sb_bytenr;
2475 u64 first_free;
2476 u64 total_bytes;
2477 u32 sectorsize;
2478
2479 extent_io_tree_init(&io_tree);
2480
2481 fd = open(devname, O_RDWR);
2482 if (fd < 0) {
2483 fprintf(stderr, "unable to open %s\n", devname);
2484 goto fail;
2485 }
2486 root = open_ctree_fd(fd, devname, 0, OPEN_CTREE_WRITES);
2487 if (!root) {
2488 fprintf(stderr, "unable to open ctree\n");
2489 goto fail;
2490 }
2491 ret = may_rollback(root);
2492 if (ret < 0) {
2493 fprintf(stderr, "unable to do rollback\n");
2494 goto fail;
2495 }
2496
2497 sectorsize = root->sectorsize;
2498 buf = malloc(sectorsize);
2499 if (!buf) {
2500 fprintf(stderr, "unable to allocate memory\n");
2501 goto fail;
2502 }
2503
2504 btrfs_init_path(&path);
2505
2506 key.objectid = EXT2_IMAGE_SUBVOL_OBJECTID;
2507 key.type = BTRFS_ROOT_ITEM_KEY;
2508 key.offset = (u64)-1;
2509 ext2_root = btrfs_read_fs_root(root->fs_info, &key);
2510 if (!ext2_root || IS_ERR(ext2_root)) {
2511 fprintf(stderr, "unable to open subvol %llu\n",
2512 (unsigned long long)key.objectid);
2513 goto fail;
2514 }
2515
2516 name = "image";
2517 root_dir = btrfs_root_dirid(&root->root_item);
2518 dir = btrfs_lookup_dir_item(NULL, ext2_root, &path,
2519 root_dir, name, strlen(name), 0);
2520 if (!dir || IS_ERR(dir)) {
2521 fprintf(stderr, "unable to find file %s\n", name);
2522 goto fail;
2523 }
2524 leaf = path.nodes[0];
2525 btrfs_dir_item_key_to_cpu(leaf, dir, &key);
2526 btrfs_release_path(&path);
2527
2528 objectid = key.objectid;
2529
2530 ret = btrfs_lookup_inode(NULL, ext2_root, &path, &key, 0);
2531 if (ret) {
2532 fprintf(stderr, "unable to find inode item\n");
2533 goto fail;
2534 }
2535 leaf = path.nodes[0];
2536 inode = btrfs_item_ptr(leaf, path.slots[0], struct btrfs_inode_item);
2537 total_bytes = btrfs_inode_size(leaf, inode);
2538 btrfs_release_path(&path);
2539
2540 key.objectid = objectid;
2541 key.offset = 0;
2542 btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY);
2543 ret = btrfs_search_slot(NULL, ext2_root, &key, &path, 0, 0);
2544 if (ret != 0) {
2545 fprintf(stderr, "unable to find first file extent\n");
2546 btrfs_release_path(&path);
2547 goto fail;
2548 }
2549
2550 /* build mapping tree for the relocated blocks */
2551 for (offset = 0; offset < total_bytes; ) {
2552 leaf = path.nodes[0];
2553 if (path.slots[0] >= btrfs_header_nritems(leaf)) {
2554 ret = btrfs_next_leaf(root, &path);
2555 if (ret != 0)
2556 break;
2557 continue;
2558 }
2559
2560 btrfs_item_key_to_cpu(leaf, &key, path.slots[0]);
2561 if (key.objectid != objectid || key.offset != offset ||
2562 btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY)
2563 break;
2564
2565 fi = btrfs_item_ptr(leaf, path.slots[0],
2566 struct btrfs_file_extent_item);
2567 if (btrfs_file_extent_type(leaf, fi) != BTRFS_FILE_EXTENT_REG)
2568 break;
2569 if (btrfs_file_extent_compression(leaf, fi) ||
2570 btrfs_file_extent_encryption(leaf, fi) ||
2571 btrfs_file_extent_other_encoding(leaf, fi))
2572 break;
2573
2574 bytenr = btrfs_file_extent_disk_bytenr(leaf, fi);
2575 /* skip holes and direct mapped extents */
2576 if (bytenr == 0 || bytenr == offset)
2577 goto next_extent;
2578
2579 bytenr += btrfs_file_extent_offset(leaf, fi);
2580 num_bytes = btrfs_file_extent_num_bytes(leaf, fi);
2581
2582 cache1 = btrfs_lookup_block_group(root->fs_info, offset);
2583 cache2 = btrfs_lookup_block_group(root->fs_info,
2584 offset + num_bytes - 1);
2585 if (!cache1 || cache1 != cache2 ||
2586 (!(cache1->flags & BTRFS_BLOCK_GROUP_SYSTEM) &&
2587 !intersect_with_sb(offset, num_bytes)))
2588 break;
2589
2590 set_extent_bits(&io_tree, offset, offset + num_bytes - 1,
2591 EXTENT_LOCKED, GFP_NOFS);
2592 set_state_private(&io_tree, offset, bytenr);
2593 next_extent:
2594 offset += btrfs_file_extent_num_bytes(leaf, fi);
2595 path.slots[0]++;
2596 }
2597 btrfs_release_path(&path);
2598
2599 if (offset < total_bytes) {
2600 fprintf(stderr, "unable to build extent mapping\n");
2601 goto fail;
2602 }
2603
2604 first_free = BTRFS_SUPER_INFO_OFFSET + 2 * sectorsize - 1;
2605 first_free &= ~((u64)sectorsize - 1);
2606 /* backup for extent #0 should exist */
2607 if(!test_range_bit(&io_tree, 0, first_free - 1, EXTENT_LOCKED, 1)) {
2608 fprintf(stderr, "no backup for the first extent\n");
2609 goto fail;
2610 }
2611 /* force no allocation from system block group */
2612 root->fs_info->system_allocs = -1;
2613 trans = btrfs_start_transaction(root, 1);
2614 BUG_ON(!trans);
2615 /*
2616 * recow the whole chunk tree, this will remove all chunk tree blocks
2617 * from system block group
2618 */
2619 chunk_root = root->fs_info->chunk_root;
2620 memset(&key, 0, sizeof(key));
2621 while (1) {
2622 ret = btrfs_search_slot(trans, chunk_root, &key, &path, 0, 1);
2623 if (ret < 0)
2624 break;
2625
2626 ret = btrfs_next_leaf(chunk_root, &path);
2627 if (ret)
2628 break;
2629
2630 btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]);
2631 btrfs_release_path(&path);
2632 }
2633 btrfs_release_path(&path);
2634
2635 offset = 0;
2636 num_bytes = 0;
2637 while(1) {
2638 cache1 = btrfs_lookup_block_group(root->fs_info, offset);
2639 if (!cache1)
2640 break;
2641
2642 if (cache1->flags & BTRFS_BLOCK_GROUP_SYSTEM)
2643 num_bytes += btrfs_block_group_used(&cache1->item);
2644
2645 offset = cache1->key.objectid + cache1->key.offset;
2646 }
2647 /* only extent #0 left in system block group? */
2648 if (num_bytes > first_free) {
2649 fprintf(stderr, "unable to empty system block group\n");
2650 goto fail;
2651 }
2652 /* create a system chunk that maps the whole device */
2653 ret = prepare_system_chunk_sb(root->fs_info->super_copy);
2654 if (ret) {
2655 fprintf(stderr, "unable to update system chunk\n");
2656 goto fail;
2657 }
2658
2659 ret = btrfs_commit_transaction(trans, root);
2660 BUG_ON(ret);
2661
2662 ret = close_ctree(root);
2663 if (ret) {
2664 fprintf(stderr, "error during close_ctree %d\n", ret);
2665 goto fail;
2666 }
2667
2668 /* zero btrfs super block mirrors */
2669 memset(buf, 0, sectorsize);
2670 for (i = 1 ; i < BTRFS_SUPER_MIRROR_MAX; i++) {
2671 bytenr = btrfs_sb_offset(i);
2672 if (bytenr >= total_bytes)
2673 break;
2674 ret = pwrite(fd, buf, sectorsize, bytenr);
2675 if (ret != sectorsize) {
2676 fprintf(stderr,
2677 "error during zeroing supreblock %d: %d\n",
2678 i, ret);
2679 goto fail;
2680 }
2681 }
2682
2683 sb_bytenr = (u64)-1;
2684 /* copy all relocated blocks back */
2685 while(1) {
2686 ret = find_first_extent_bit(&io_tree, 0, &start, &end,
2687 EXTENT_LOCKED);
2688 if (ret)
2689 break;
2690
2691 ret = get_state_private(&io_tree, start, &bytenr);
2692 BUG_ON(ret);
2693
2694 clear_extent_bits(&io_tree, start, end, EXTENT_LOCKED,
2695 GFP_NOFS);
2696
2697 while (start <= end) {
2698 if (start == BTRFS_SUPER_INFO_OFFSET) {
2699 sb_bytenr = bytenr;
2700 goto next_sector;
2701 }
2702 ret = pread(fd, buf, sectorsize, bytenr);
2703 if (ret < 0) {
2704 fprintf(stderr, "error during pread %d\n", ret);
2705 goto fail;
2706 }
2707 BUG_ON(ret != sectorsize);
2708 ret = pwrite(fd, buf, sectorsize, start);
2709 if (ret < 0) {
2710 fprintf(stderr, "error during pwrite %d\n", ret);
2711 goto fail;
2712 }
2713 BUG_ON(ret != sectorsize);
2714 next_sector:
2715 start += sectorsize;
2716 bytenr += sectorsize;
2717 }
2718 }
2719
2720 ret = fsync(fd);
2721 if (ret) {
2722 fprintf(stderr, "error during fsync %d\n", ret);
2723 goto fail;
2724 }
2725 /*
2726 * finally, overwrite btrfs super block.
2727 */
2728 ret = pread(fd, buf, sectorsize, sb_bytenr);
2729 if (ret < 0) {
2730 fprintf(stderr, "error during pread %d\n", ret);
2731 goto fail;
2732 }
2733 BUG_ON(ret != sectorsize);
2734 ret = pwrite(fd, buf, sectorsize, BTRFS_SUPER_INFO_OFFSET);
2735 if (ret < 0) {
2736 fprintf(stderr, "error during pwrite %d\n", ret);
2737 goto fail;
2738 }
2739 BUG_ON(ret != sectorsize);
2740 ret = fsync(fd);
2741 if (ret) {
2742 fprintf(stderr, "error during fsync %d\n", ret);
2743 goto fail;
2744 }
2745
2746 close(fd);
2747 free(buf);
2748 extent_io_tree_cleanup(&io_tree);
2749 printf("rollback complete.\n");
2750 return 0;
2751
2752 fail:
2753 if (fd != -1)
2754 close(fd);
2755 free(buf);
2756 fprintf(stderr, "rollback aborted.\n");
2757 return -1;
2758 }
2759
2760 static void print_usage(void)
2761 {
2762 printf("usage: btrfs-convert [-d] [-i] [-n] [-r] [-l label] [-L] device\n");
2763 printf("\t-d disable data checksum\n");
2764 printf("\t-i ignore xattrs and ACLs\n");
2765 printf("\t-n disable packing of small files\n");
2766 printf("\t-r roll back to ext2fs\n");
2767 printf("\t-l LABEL set filesystem label\n");
2768 printf("\t-L use label from converted fs\n");
2769 printf("\t-p show converting progress\n");
2770 }
2771
2772 int main(int argc, char *argv[])
2773 {
2774 int ret;
2775 int packing = 1;
2776 int noxattr = 0;
2777 int datacsum = 1;
2778 int rollback = 0;
2779 int copylabel = 0;
2780 int usage_error = 0;
2781 int progress = 0;
2782 char *file;
2783 char *fslabel = NULL;
2784
2785 while(1) {
2786 int c = getopt(argc, argv, "dinrl:Lp");
2787 if (c < 0)
2788 break;
2789 switch(c) {
2790 case 'd':
2791 datacsum = 0;
2792 break;
2793 case 'i':
2794 noxattr = 1;
2795 break;
2796 case 'n':
2797 packing = 0;
2798 break;
2799 case 'r':
2800 rollback = 1;
2801 break;
2802 case 'l':
2803 copylabel = -1;
2804 fslabel = strdup(optarg);
2805 if (strlen(fslabel) > BTRFS_LABEL_SIZE) {
2806 fprintf(stderr,
2807 "warning: label too long, trimmed to %d bytes\n",
2808 BTRFS_LABEL_SIZE);
2809 fslabel[BTRFS_LABEL_SIZE] = 0;
2810 }
2811 break;
2812 case 'L':
2813 copylabel = 1;
2814 break;
2815 case 'p':
2816 progress = 1;
2817 break;
2818 default:
2819 print_usage();
2820 return 1;
2821 }
2822 }
2823 argc = argc - optind;
2824 set_argv0(argv);
2825 if (check_argc_exact(argc, 1)) {
2826 print_usage();
2827 return 1;
2828 }
2829
2830 if (rollback && (!datacsum || noxattr || !packing)) {
2831 fprintf(stderr,
2832 "Usage error: -d, -i, -n options do not apply to rollback\n");
2833 usage_error++;
2834 }
2835
2836 if (usage_error) {
2837 print_usage();
2838 return 1;
2839 }
2840
2841 file = argv[optind];
2842 ret = check_mounted(file);
2843 if (ret < 0) {
2844 fprintf(stderr, "Could not check mount status: %s\n",
2845 strerror(-ret));
2846 return 1;
2847 } else if (ret) {
2848 fprintf(stderr, "%s is mounted\n", file);
2849 return 1;
2850 }
2851
2852 if (rollback) {
2853 ret = do_rollback(file);
2854 } else {
2855 ret = do_convert(file, datacsum, packing, noxattr, copylabel, fslabel, progress);
2856 }
2857 if (ret)
2858 return 1;
2859 return 0;
2860 }
(deprecated) Btrfs progs developments and patch integration