2 * Copyright (C) 2007 Oracle. All rights reserved.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
19 #define _XOPEN_SOURCE 600
22 #include "kerncompat.h"
24 #include <sys/ioctl.h>
25 #include <sys/mount.h>
28 #include <sys/types.h>
33 #include <uuid/uuid.h>
38 #include "transaction.h"
41 #include "task-utils.h"
42 #include <ext2fs/ext2_fs.h>
43 #include <ext2fs/ext2fs.h>
44 #include <ext2fs/ext2_ext_attr.h>
46 #define INO_OFFSET (BTRFS_FIRST_FREE_OBJECTID - EXT2_ROOT_INO)
47 #define EXT2_IMAGE_SUBVOL_OBJECTID BTRFS_FIRST_FREE_OBJECTID
50 uint32_t max_copy_inodes;
51 uint32_t cur_copy_inodes;
52 struct task_info *info;
55 static void *print_copied_inodes(void *p)
57 struct task_ctx *priv = p;
58 const char work_indicator[] = { '.', 'o', 'O', 'o' };
61 task_period_start(priv->info, 1000 /* 1s */);
64 printf("copy inodes [%c] [%10d/%10d]\r",
65 work_indicator[count % 4], priv->cur_copy_inodes,
66 priv->max_copy_inodes);
68 task_period_wait(priv->info);
74 static int after_copied_inodes(void *p)
76 struct task_ctx *priv = p;
79 task_period_stop(priv->info);
85 * Open Ext2fs in readonly mode, read block allocation bitmap and
86 * inode bitmap into memory.
88 static int open_ext2fs(const char *name, ext2_filsys *ret_fs)
93 ret = ext2fs_open(name, 0, 0, 0, unix_io_manager, &ext2_fs);
95 fprintf(stderr, "ext2fs_open: %s\n", error_message(ret));
98 ret = ext2fs_read_inode_bitmap(ext2_fs);
100 fprintf(stderr, "ext2fs_read_inode_bitmap: %s\n",
104 ret = ext2fs_read_block_bitmap(ext2_fs);
106 fprintf(stderr, "ext2fs_read_block_bitmap: %s\n",
111 * search each block group for a free inode. this set up
112 * uninit block/inode bitmaps appropriately.
115 while (ino <= ext2_fs->super->s_inodes_count) {
117 ext2fs_new_inode(ext2_fs, ino, 0, NULL, &foo);
118 ino += EXT2_INODES_PER_GROUP(ext2_fs->super);
127 static int close_ext2fs(ext2_filsys fs)
133 static int ext2_alloc_block(ext2_filsys fs, u64 goal, u64 *block_ret)
137 if (!ext2fs_new_block(fs, goal, NULL, &block)) {
138 ext2fs_fast_mark_block_bitmap(fs->block_map, block);
145 static int ext2_free_block(ext2_filsys fs, u64 block)
147 BUG_ON(block != (blk_t)block);
148 ext2fs_fast_unmark_block_bitmap(fs->block_map, block);
152 static int cache_free_extents(struct btrfs_root *root, ext2_filsys ext2_fs)
158 u64 blocksize = ext2_fs->blocksize;
160 block = ext2_fs->super->s_first_data_block;
161 for (; block < ext2_fs->super->s_blocks_count; block++) {
162 if (ext2fs_fast_test_block_bitmap(ext2_fs->block_map, block))
164 bytenr = block * blocksize;
165 ret = set_extent_dirty(&root->fs_info->free_space_cache,
166 bytenr, bytenr + blocksize - 1, 0);
170 for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
171 bytenr = btrfs_sb_offset(i);
172 bytenr &= ~((u64)BTRFS_STRIPE_LEN - 1);
173 if (bytenr >= blocksize * ext2_fs->super->s_blocks_count)
175 clear_extent_dirty(&root->fs_info->free_space_cache, bytenr,
176 bytenr + BTRFS_STRIPE_LEN - 1, 0);
179 clear_extent_dirty(&root->fs_info->free_space_cache,
180 0, BTRFS_SUPER_INFO_OFFSET - 1, 0);
185 static int custom_alloc_extent(struct btrfs_root *root, u64 num_bytes,
186 u64 hint_byte, struct btrfs_key *ins)
190 u64 last = hint_byte;
193 struct btrfs_block_group_cache *cache;
196 ret = find_first_extent_bit(&root->fs_info->free_space_cache,
197 last, &start, &end, EXTENT_DIRTY);
199 if (wrapped++ == 0) {
207 start = max(last, start);
209 if (last - start < num_bytes)
212 last = start + num_bytes;
213 if (test_range_bit(&root->fs_info->pinned_extents,
214 start, last - 1, EXTENT_DIRTY, 0))
217 cache = btrfs_lookup_block_group(root->fs_info, start);
219 if (cache->flags & BTRFS_BLOCK_GROUP_SYSTEM ||
220 last > cache->key.objectid + cache->key.offset) {
221 last = cache->key.objectid + cache->key.offset;
225 clear_extent_dirty(&root->fs_info->free_space_cache,
226 start, start + num_bytes - 1, 0);
228 ins->objectid = start;
229 ins->offset = num_bytes;
230 ins->type = BTRFS_EXTENT_ITEM_KEY;
234 fprintf(stderr, "not enough free space\n");
238 static int intersect_with_sb(u64 bytenr, u64 num_bytes)
243 for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
244 offset = btrfs_sb_offset(i);
245 offset &= ~((u64)BTRFS_STRIPE_LEN - 1);
247 if (bytenr < offset + BTRFS_STRIPE_LEN &&
248 bytenr + num_bytes > offset)
254 static int custom_free_extent(struct btrfs_root *root, u64 bytenr,
257 return intersect_with_sb(bytenr, num_bytes);
260 static struct btrfs_extent_ops extent_ops = {
261 .alloc_extent = custom_alloc_extent,
262 .free_extent = custom_free_extent,
265 struct dir_iterate_data {
266 struct btrfs_trans_handle *trans;
267 struct btrfs_root *root;
268 struct btrfs_inode_item *inode;
275 static u8 filetype_conversion_table[EXT2_FT_MAX] = {
276 [EXT2_FT_UNKNOWN] = BTRFS_FT_UNKNOWN,
277 [EXT2_FT_REG_FILE] = BTRFS_FT_REG_FILE,
278 [EXT2_FT_DIR] = BTRFS_FT_DIR,
279 [EXT2_FT_CHRDEV] = BTRFS_FT_CHRDEV,
280 [EXT2_FT_BLKDEV] = BTRFS_FT_BLKDEV,
281 [EXT2_FT_FIFO] = BTRFS_FT_FIFO,
282 [EXT2_FT_SOCK] = BTRFS_FT_SOCK,
283 [EXT2_FT_SYMLINK] = BTRFS_FT_SYMLINK,
286 static int dir_iterate_proc(ext2_ino_t dir, int entry,
287 struct ext2_dir_entry *dirent,
288 int offset, int blocksize,
289 char *buf,void *priv_data)
295 char dotdot[] = "..";
296 struct btrfs_key location;
297 struct dir_iterate_data *idata = (struct dir_iterate_data *)priv_data;
300 name_len = dirent->name_len & 0xFF;
302 objectid = dirent->inode + INO_OFFSET;
303 if (!strncmp(dirent->name, dotdot, name_len)) {
305 BUG_ON(idata->parent != 0);
306 idata->parent = objectid;
310 if (dirent->inode < EXT2_GOOD_OLD_FIRST_INO)
313 location.objectid = objectid;
315 btrfs_set_key_type(&location, BTRFS_INODE_ITEM_KEY);
317 file_type = dirent->name_len >> 8;
318 BUG_ON(file_type > EXT2_FT_SYMLINK);
319 ret = btrfs_insert_dir_item(idata->trans, idata->root,
320 dirent->name, name_len,
321 idata->objectid, &location,
322 filetype_conversion_table[file_type],
326 ret = btrfs_insert_inode_ref(idata->trans, idata->root,
327 dirent->name, name_len,
328 objectid, idata->objectid,
333 inode_size = btrfs_stack_inode_size(idata->inode) +
335 btrfs_set_stack_inode_size(idata->inode, inode_size);
338 idata->errcode = ret;
342 static int create_dir_entries(struct btrfs_trans_handle *trans,
343 struct btrfs_root *root, u64 objectid,
344 struct btrfs_inode_item *btrfs_inode,
345 ext2_filsys ext2_fs, ext2_ino_t ext2_ino)
349 struct dir_iterate_data data = {
352 .inode = btrfs_inode,
353 .objectid = objectid,
359 err = ext2fs_dir_iterate2(ext2_fs, ext2_ino, 0, NULL,
360 dir_iterate_proc, &data);
364 if (ret == 0 && data.parent == objectid) {
365 ret = btrfs_insert_inode_ref(trans, root, "..", 2,
366 objectid, objectid, 0);
370 fprintf(stderr, "ext2fs_dir_iterate2: %s\n", error_message(err));
374 static int read_disk_extent(struct btrfs_root *root, u64 bytenr,
375 u32 num_bytes, char *buffer)
378 struct btrfs_fs_devices *fs_devs = root->fs_info->fs_devices;
380 ret = pread(fs_devs->latest_bdev, buffer, num_bytes, bytenr);
381 if (ret != num_bytes)
390 static int csum_disk_extent(struct btrfs_trans_handle *trans,
391 struct btrfs_root *root,
392 u64 disk_bytenr, u64 num_bytes)
394 u32 blocksize = root->sectorsize;
399 buffer = malloc(blocksize);
402 for (offset = 0; offset < num_bytes; offset += blocksize) {
403 ret = read_disk_extent(root, disk_bytenr + offset,
407 ret = btrfs_csum_file_block(trans,
408 root->fs_info->csum_root,
409 disk_bytenr + num_bytes,
410 disk_bytenr + offset,
419 static int record_file_blocks(struct btrfs_trans_handle *trans,
420 struct btrfs_root *root, u64 objectid,
421 struct btrfs_inode_item *inode,
422 u64 file_block, u64 disk_block,
423 u64 num_blocks, int checksum)
426 u64 file_pos = file_block * root->sectorsize;
427 u64 disk_bytenr = disk_block * root->sectorsize;
428 u64 num_bytes = num_blocks * root->sectorsize;
429 ret = btrfs_record_file_extent(trans, root, objectid, inode, file_pos,
430 disk_bytenr, num_bytes);
432 if (ret || !checksum || disk_bytenr == 0)
435 return csum_disk_extent(trans, root, disk_bytenr, num_bytes);
438 struct blk_iterate_data {
439 struct btrfs_trans_handle *trans;
440 struct btrfs_root *root;
441 struct btrfs_inode_item *inode;
451 static int block_iterate_proc(ext2_filsys ext2_fs,
452 u64 disk_block, u64 file_block,
453 struct blk_iterate_data *idata)
458 struct btrfs_root *root = idata->root;
459 struct btrfs_trans_handle *trans = idata->trans;
460 struct btrfs_block_group_cache *cache;
461 u64 bytenr = disk_block * root->sectorsize;
463 sb_region = intersect_with_sb(bytenr, root->sectorsize);
464 do_barrier = sb_region || disk_block >= idata->boundary;
465 if ((idata->num_blocks > 0 && do_barrier) ||
466 (file_block > idata->first_block + idata->num_blocks) ||
467 (disk_block != idata->disk_block + idata->num_blocks)) {
468 if (idata->num_blocks > 0) {
469 ret = record_file_blocks(trans, root, idata->objectid,
470 idata->inode, idata->first_block,
471 idata->disk_block, idata->num_blocks,
475 idata->first_block += idata->num_blocks;
476 idata->num_blocks = 0;
478 if (file_block > idata->first_block) {
479 ret = record_file_blocks(trans, root, idata->objectid,
480 idata->inode, idata->first_block,
481 0, file_block - idata->first_block,
488 bytenr += BTRFS_STRIPE_LEN - 1;
489 bytenr &= ~((u64)BTRFS_STRIPE_LEN - 1);
491 cache = btrfs_lookup_block_group(root->fs_info, bytenr);
493 bytenr = cache->key.objectid + cache->key.offset;
496 idata->first_block = file_block;
497 idata->disk_block = disk_block;
498 idata->boundary = bytenr / root->sectorsize;
503 idata->errcode = ret;
507 static int __block_iterate_proc(ext2_filsys fs, blk_t *blocknr,
508 e2_blkcnt_t blockcnt, blk_t ref_block,
509 int ref_offset, void *priv_data)
511 struct blk_iterate_data *idata;
512 idata = (struct blk_iterate_data *)priv_data;
513 return block_iterate_proc(fs, *blocknr, blockcnt, idata);
517 * traverse file's data blocks, record these data blocks as file extents.
519 static int create_file_extents(struct btrfs_trans_handle *trans,
520 struct btrfs_root *root, u64 objectid,
521 struct btrfs_inode_item *btrfs_inode,
522 ext2_filsys ext2_fs, ext2_ino_t ext2_ino,
523 int datacsum, int packing)
529 u32 sectorsize = root->sectorsize;
530 u64 inode_size = btrfs_stack_inode_size(btrfs_inode);
531 struct blk_iterate_data data = {
534 .inode = btrfs_inode,
535 .objectid = objectid,
540 .checksum = datacsum,
543 err = ext2fs_block_iterate2(ext2_fs, ext2_ino, BLOCK_FLAG_DATA_ONLY,
544 NULL, __block_iterate_proc, &data);
550 if (packing && data.first_block == 0 && data.num_blocks > 0 &&
551 inode_size <= BTRFS_MAX_INLINE_DATA_SIZE(root)) {
552 u64 num_bytes = data.num_blocks * sectorsize;
553 u64 disk_bytenr = data.disk_block * sectorsize;
556 buffer = malloc(num_bytes);
559 ret = read_disk_extent(root, disk_bytenr, num_bytes, buffer);
562 if (num_bytes > inode_size)
563 num_bytes = inode_size;
564 ret = btrfs_insert_inline_extent(trans, root, objectid,
565 0, buffer, num_bytes);
568 nbytes = btrfs_stack_inode_nbytes(btrfs_inode) + num_bytes;
569 btrfs_set_stack_inode_nbytes(btrfs_inode, nbytes);
570 } else if (data.num_blocks > 0) {
571 ret = record_file_blocks(trans, root, objectid, btrfs_inode,
572 data.first_block, data.disk_block,
573 data.num_blocks, data.checksum);
577 data.first_block += data.num_blocks;
578 last_block = (inode_size + sectorsize - 1) / sectorsize;
579 if (last_block > data.first_block) {
580 ret = record_file_blocks(trans, root, objectid, btrfs_inode,
581 data.first_block, 0, last_block -
582 data.first_block, data.checksum);
588 fprintf(stderr, "ext2fs_block_iterate2: %s\n", error_message(err));
592 static int create_symbol_link(struct btrfs_trans_handle *trans,
593 struct btrfs_root *root, u64 objectid,
594 struct btrfs_inode_item *btrfs_inode,
595 ext2_filsys ext2_fs, ext2_ino_t ext2_ino,
596 struct ext2_inode *ext2_inode)
600 u64 inode_size = btrfs_stack_inode_size(btrfs_inode);
601 if (ext2fs_inode_data_blocks(ext2_fs, ext2_inode)) {
602 btrfs_set_stack_inode_size(btrfs_inode, inode_size + 1);
603 ret = create_file_extents(trans, root, objectid, btrfs_inode,
604 ext2_fs, ext2_ino, 1, 1);
605 btrfs_set_stack_inode_size(btrfs_inode, inode_size);
609 pathname = (char *)&(ext2_inode->i_block[0]);
610 BUG_ON(pathname[inode_size] != 0);
611 ret = btrfs_insert_inline_extent(trans, root, objectid, 0,
612 pathname, inode_size + 1);
613 btrfs_set_stack_inode_nbytes(btrfs_inode, inode_size + 1);
618 * Following xattr/acl related codes are based on codes in
619 * fs/ext3/xattr.c and fs/ext3/acl.c
621 #define EXT2_XATTR_BHDR(ptr) ((struct ext2_ext_attr_header *)(ptr))
622 #define EXT2_XATTR_BFIRST(ptr) \
623 ((struct ext2_ext_attr_entry *)(EXT2_XATTR_BHDR(ptr) + 1))
624 #define EXT2_XATTR_IHDR(inode) \
625 ((struct ext2_ext_attr_header *) ((void *)(inode) + \
626 EXT2_GOOD_OLD_INODE_SIZE + (inode)->i_extra_isize))
627 #define EXT2_XATTR_IFIRST(inode) \
628 ((struct ext2_ext_attr_entry *) ((void *)EXT2_XATTR_IHDR(inode) + \
629 sizeof(EXT2_XATTR_IHDR(inode)->h_magic)))
631 static int ext2_xattr_check_names(struct ext2_ext_attr_entry *entry,
634 struct ext2_ext_attr_entry *next;
636 while (!EXT2_EXT_IS_LAST_ENTRY(entry)) {
637 next = EXT2_EXT_ATTR_NEXT(entry);
638 if ((void *)next >= end)
645 static int ext2_xattr_check_block(const char *buf, size_t size)
648 struct ext2_ext_attr_header *header = EXT2_XATTR_BHDR(buf);
650 if (header->h_magic != EXT2_EXT_ATTR_MAGIC ||
651 header->h_blocks != 1)
653 error = ext2_xattr_check_names(EXT2_XATTR_BFIRST(buf), buf + size);
657 static int ext2_xattr_check_entry(struct ext2_ext_attr_entry *entry,
660 size_t value_size = entry->e_value_size;
662 if (entry->e_value_block != 0 || value_size > size ||
663 entry->e_value_offs + value_size > size)
668 #define EXT2_ACL_VERSION 0x0001
679 } ext2_acl_entry_short;
685 static inline int ext2_acl_count(size_t size)
688 size -= sizeof(ext2_acl_header);
689 s = size - 4 * sizeof(ext2_acl_entry_short);
691 if (size % sizeof(ext2_acl_entry_short))
693 return size / sizeof(ext2_acl_entry_short);
695 if (s % sizeof(ext2_acl_entry))
697 return s / sizeof(ext2_acl_entry) + 4;
701 #define ACL_EA_VERSION 0x0002
711 acl_ea_entry a_entries[0];
714 static inline size_t acl_ea_size(int count)
716 return sizeof(acl_ea_header) + count * sizeof(acl_ea_entry);
719 static int ext2_acl_to_xattr(void *dst, const void *src,
720 size_t dst_size, size_t src_size)
723 const void *end = src + src_size;
724 acl_ea_header *ext_acl = (acl_ea_header *)dst;
725 acl_ea_entry *dst_entry = ext_acl->a_entries;
726 ext2_acl_entry *src_entry;
728 if (src_size < sizeof(ext2_acl_header))
730 if (((ext2_acl_header *)src)->a_version !=
731 cpu_to_le32(EXT2_ACL_VERSION))
733 src += sizeof(ext2_acl_header);
734 count = ext2_acl_count(src_size);
738 BUG_ON(dst_size < acl_ea_size(count));
739 ext_acl->a_version = cpu_to_le32(ACL_EA_VERSION);
740 for (i = 0; i < count; i++, dst_entry++) {
741 src_entry = (ext2_acl_entry *)src;
742 if (src + sizeof(ext2_acl_entry_short) > end)
744 dst_entry->e_tag = src_entry->e_tag;
745 dst_entry->e_perm = src_entry->e_perm;
746 switch (le16_to_cpu(src_entry->e_tag)) {
751 src += sizeof(ext2_acl_entry_short);
752 dst_entry->e_id = cpu_to_le32(ACL_UNDEFINED_ID);
756 src += sizeof(ext2_acl_entry);
759 dst_entry->e_id = src_entry->e_id;
772 static char *xattr_prefix_table[] = {
774 [2] = "system.posix_acl_access",
775 [3] = "system.posix_acl_default",
780 static int copy_single_xattr(struct btrfs_trans_handle *trans,
781 struct btrfs_root *root, u64 objectid,
782 struct ext2_ext_attr_entry *entry,
783 const void *data, u32 datalen)
788 void *databuf = NULL;
789 char namebuf[XATTR_NAME_MAX + 1];
791 name_index = entry->e_name_index;
792 if (name_index >= ARRAY_SIZE(xattr_prefix_table) ||
793 xattr_prefix_table[name_index] == NULL)
795 name_len = strlen(xattr_prefix_table[name_index]) +
797 if (name_len >= sizeof(namebuf))
800 if (name_index == 2 || name_index == 3) {
801 size_t bufsize = acl_ea_size(ext2_acl_count(datalen));
802 databuf = malloc(bufsize);
805 ret = ext2_acl_to_xattr(databuf, data, bufsize, datalen);
811 strncpy(namebuf, xattr_prefix_table[name_index], XATTR_NAME_MAX);
812 strncat(namebuf, EXT2_EXT_ATTR_NAME(entry), entry->e_name_len);
813 if (name_len + datalen > BTRFS_LEAF_DATA_SIZE(root) -
814 sizeof(struct btrfs_item) - sizeof(struct btrfs_dir_item)) {
815 fprintf(stderr, "skip large xattr on inode %Lu name %.*s\n",
816 objectid - INO_OFFSET, name_len, namebuf);
819 ret = btrfs_insert_xattr_item(trans, root, namebuf, name_len,
820 data, datalen, objectid);
826 static int copy_extended_attrs(struct btrfs_trans_handle *trans,
827 struct btrfs_root *root, u64 objectid,
828 struct btrfs_inode_item *btrfs_inode,
829 ext2_filsys ext2_fs, ext2_ino_t ext2_ino)
835 u32 block_size = ext2_fs->blocksize;
836 u32 inode_size = EXT2_INODE_SIZE(ext2_fs->super);
837 struct ext2_inode_large *ext2_inode;
838 struct ext2_ext_attr_entry *entry;
841 char inode_buf[EXT2_GOOD_OLD_INODE_SIZE];
843 if (inode_size <= EXT2_GOOD_OLD_INODE_SIZE) {
844 ext2_inode = (struct ext2_inode_large *)inode_buf;
846 ext2_inode = (struct ext2_inode_large *)malloc(inode_size);
850 err = ext2fs_read_inode_full(ext2_fs, ext2_ino, (void *)ext2_inode,
853 fprintf(stderr, "ext2fs_read_inode_full: %s\n",
859 if (ext2_ino > ext2_fs->super->s_first_ino &&
860 inode_size > EXT2_GOOD_OLD_INODE_SIZE) {
861 if (EXT2_GOOD_OLD_INODE_SIZE +
862 ext2_inode->i_extra_isize > inode_size) {
866 if (ext2_inode->i_extra_isize != 0 &&
867 EXT2_XATTR_IHDR(ext2_inode)->h_magic ==
868 EXT2_EXT_ATTR_MAGIC) {
874 void *end = (void *)ext2_inode + inode_size;
875 entry = EXT2_XATTR_IFIRST(ext2_inode);
876 total = end - (void *)entry;
877 ret = ext2_xattr_check_names(entry, end);
880 while (!EXT2_EXT_IS_LAST_ENTRY(entry)) {
881 ret = ext2_xattr_check_entry(entry, total);
884 data = (void *)EXT2_XATTR_IFIRST(ext2_inode) +
886 datalen = entry->e_value_size;
887 ret = copy_single_xattr(trans, root, objectid,
888 entry, data, datalen);
891 entry = EXT2_EXT_ATTR_NEXT(entry);
895 if (ext2_inode->i_file_acl == 0)
898 buffer = malloc(block_size);
903 err = ext2fs_read_ext_attr(ext2_fs, ext2_inode->i_file_acl, buffer);
905 fprintf(stderr, "ext2fs_read_ext_attr: %s\n",
910 ret = ext2_xattr_check_block(buffer, block_size);
914 entry = EXT2_XATTR_BFIRST(buffer);
915 while (!EXT2_EXT_IS_LAST_ENTRY(entry)) {
916 ret = ext2_xattr_check_entry(entry, block_size);
919 data = buffer + entry->e_value_offs;
920 datalen = entry->e_value_size;
921 ret = copy_single_xattr(trans, root, objectid,
922 entry, data, datalen);
925 entry = EXT2_EXT_ATTR_NEXT(entry);
929 if ((void *)ext2_inode != inode_buf)
934 #define MKDEV(ma, mi) (((ma) << MINORBITS) | (mi))
936 static inline dev_t old_decode_dev(u16 val)
938 return MKDEV((val >> 8) & 255, val & 255);
941 static inline dev_t new_decode_dev(u32 dev)
943 unsigned major = (dev & 0xfff00) >> 8;
944 unsigned minor = (dev & 0xff) | ((dev >> 12) & 0xfff00);
945 return MKDEV(major, minor);
948 static int copy_inode_item(struct btrfs_inode_item *dst,
949 struct ext2_inode *src, u32 blocksize)
951 btrfs_set_stack_inode_generation(dst, 1);
952 btrfs_set_stack_inode_size(dst, src->i_size);
953 btrfs_set_stack_inode_nbytes(dst, 0);
954 btrfs_set_stack_inode_block_group(dst, 0);
955 btrfs_set_stack_inode_nlink(dst, src->i_links_count);
956 btrfs_set_stack_inode_uid(dst, src->i_uid | (src->i_uid_high << 16));
957 btrfs_set_stack_inode_gid(dst, src->i_gid | (src->i_gid_high << 16));
958 btrfs_set_stack_inode_mode(dst, src->i_mode);
959 btrfs_set_stack_inode_rdev(dst, 0);
960 btrfs_set_stack_inode_flags(dst, 0);
961 btrfs_set_stack_timespec_sec(&dst->atime, src->i_atime);
962 btrfs_set_stack_timespec_nsec(&dst->atime, 0);
963 btrfs_set_stack_timespec_sec(&dst->ctime, src->i_ctime);
964 btrfs_set_stack_timespec_nsec(&dst->ctime, 0);
965 btrfs_set_stack_timespec_sec(&dst->mtime, src->i_mtime);
966 btrfs_set_stack_timespec_nsec(&dst->mtime, 0);
967 btrfs_set_stack_timespec_sec(&dst->otime, 0);
968 btrfs_set_stack_timespec_nsec(&dst->otime, 0);
970 if (S_ISDIR(src->i_mode)) {
971 btrfs_set_stack_inode_size(dst, 0);
972 btrfs_set_stack_inode_nlink(dst, 1);
974 if (S_ISREG(src->i_mode)) {
975 btrfs_set_stack_inode_size(dst, (u64)src->i_size_high << 32 |
978 if (!S_ISREG(src->i_mode) && !S_ISDIR(src->i_mode) &&
979 !S_ISLNK(src->i_mode)) {
980 if (src->i_block[0]) {
981 btrfs_set_stack_inode_rdev(dst,
982 old_decode_dev(src->i_block[0]));
984 btrfs_set_stack_inode_rdev(dst,
985 new_decode_dev(src->i_block[1]));
992 * copy a single inode. do all the required works, such as cloning
993 * inode item, creating file extents and creating directory entries.
995 static int copy_single_inode(struct btrfs_trans_handle *trans,
996 struct btrfs_root *root, u64 objectid,
997 ext2_filsys ext2_fs, ext2_ino_t ext2_ino,
998 struct ext2_inode *ext2_inode,
999 int datacsum, int packing, int noxattr)
1002 struct btrfs_key inode_key;
1003 struct btrfs_inode_item btrfs_inode;
1005 if (ext2_inode->i_links_count == 0)
1008 copy_inode_item(&btrfs_inode, ext2_inode, ext2_fs->blocksize);
1009 if (!datacsum && S_ISREG(ext2_inode->i_mode)) {
1010 u32 flags = btrfs_stack_inode_flags(&btrfs_inode) |
1011 BTRFS_INODE_NODATASUM;
1012 btrfs_set_stack_inode_flags(&btrfs_inode, flags);
1015 switch (ext2_inode->i_mode & S_IFMT) {
1017 ret = create_file_extents(trans, root, objectid, &btrfs_inode,
1018 ext2_fs, ext2_ino, datacsum, packing);
1021 ret = create_dir_entries(trans, root, objectid, &btrfs_inode,
1025 ret = create_symbol_link(trans, root, objectid, &btrfs_inode,
1026 ext2_fs, ext2_ino, ext2_inode);
1036 ret = copy_extended_attrs(trans, root, objectid, &btrfs_inode,
1041 inode_key.objectid = objectid;
1042 inode_key.offset = 0;
1043 btrfs_set_key_type(&inode_key, BTRFS_INODE_ITEM_KEY);
1044 ret = btrfs_insert_inode(trans, root, objectid, &btrfs_inode);
1048 static int copy_disk_extent(struct btrfs_root *root, u64 dst_bytenr,
1049 u64 src_bytenr, u32 num_bytes)
1053 struct btrfs_fs_devices *fs_devs = root->fs_info->fs_devices;
1055 buffer = malloc(num_bytes);
1058 ret = pread(fs_devs->latest_bdev, buffer, num_bytes, src_bytenr);
1059 if (ret != num_bytes)
1061 ret = pwrite(fs_devs->latest_bdev, buffer, num_bytes, dst_bytenr);
1062 if (ret != num_bytes)
1072 * scan ext2's inode bitmap and copy all used inodes.
1074 static int copy_inodes(struct btrfs_root *root, ext2_filsys ext2_fs,
1075 int datacsum, int packing, int noxattr, struct task_ctx *p)
1079 ext2_inode_scan ext2_scan;
1080 struct ext2_inode ext2_inode;
1081 ext2_ino_t ext2_ino;
1083 struct btrfs_trans_handle *trans;
1085 trans = btrfs_start_transaction(root, 1);
1088 err = ext2fs_open_inode_scan(ext2_fs, 0, &ext2_scan);
1090 fprintf(stderr, "ext2fs_open_inode_scan: %s\n", error_message(err));
1093 while (!(err = ext2fs_get_next_inode(ext2_scan, &ext2_ino,
1095 /* no more inodes */
1098 /* skip special inode in ext2fs */
1099 if (ext2_ino < EXT2_GOOD_OLD_FIRST_INO &&
1100 ext2_ino != EXT2_ROOT_INO)
1102 objectid = ext2_ino + INO_OFFSET;
1103 ret = copy_single_inode(trans, root,
1104 objectid, ext2_fs, ext2_ino,
1105 &ext2_inode, datacsum, packing,
1107 p->cur_copy_inodes++;
1110 if (trans->blocks_used >= 4096) {
1111 ret = btrfs_commit_transaction(trans, root);
1113 trans = btrfs_start_transaction(root, 1);
1118 fprintf(stderr, "ext2fs_get_next_inode: %s\n", error_message(err));
1121 ret = btrfs_commit_transaction(trans, root);
1128 * Construct a range of ext2fs image file.
1129 * scan block allocation bitmap, find all blocks used by the ext2fs
1130 * in this range and create file extents that point to these blocks.
1132 * Note: Before calling the function, no file extent points to blocks
1135 static int create_image_file_range(struct btrfs_trans_handle *trans,
1136 struct btrfs_root *root, u64 objectid,
1137 struct btrfs_inode_item *inode,
1138 u64 start_byte, u64 end_byte,
1139 ext2_filsys ext2_fs)
1141 u32 blocksize = ext2_fs->blocksize;
1142 u32 block = start_byte / blocksize;
1143 u32 last_block = (end_byte + blocksize - 1) / blocksize;
1145 struct blk_iterate_data data = {
1149 .objectid = objectid,
1150 .first_block = block,
1153 .boundary = (u64)-1,
1157 for (; start_byte < end_byte; block++, start_byte += blocksize) {
1158 if (!ext2fs_fast_test_block_bitmap(ext2_fs->block_map, block))
1160 ret = block_iterate_proc(NULL, block, block, &data);
1161 if (ret & BLOCK_ABORT) {
1166 if (data.num_blocks > 0) {
1167 ret = record_file_blocks(trans, root, objectid, inode,
1168 data.first_block, data.disk_block,
1169 data.num_blocks, 0);
1172 data.first_block += data.num_blocks;
1174 if (last_block > data.first_block) {
1175 ret = record_file_blocks(trans, root, objectid, inode,
1176 data.first_block, 0, last_block -
1177 data.first_block, 0);
1185 * Create the ext2fs image file.
1187 static int create_ext2_image(struct btrfs_root *root, ext2_filsys ext2_fs,
1191 struct btrfs_key key;
1192 struct btrfs_key location;
1193 struct btrfs_path path;
1194 struct btrfs_inode_item btrfs_inode;
1195 struct btrfs_inode_item *inode_item;
1196 struct extent_buffer *leaf;
1197 struct btrfs_fs_info *fs_info = root->fs_info;
1198 struct btrfs_root *extent_root = fs_info->extent_root;
1199 struct btrfs_trans_handle *trans;
1200 struct btrfs_extent_item *ei;
1201 struct btrfs_extent_inline_ref *iref;
1202 struct btrfs_extent_data_ref *dref;
1209 u32 sectorsize = root->sectorsize;
1211 total_bytes = btrfs_super_total_bytes(fs_info->super_copy);
1212 first_free = BTRFS_SUPER_INFO_OFFSET + sectorsize * 2 - 1;
1213 first_free &= ~((u64)sectorsize - 1);
1215 memset(&btrfs_inode, 0, sizeof(btrfs_inode));
1216 btrfs_set_stack_inode_generation(&btrfs_inode, 1);
1217 btrfs_set_stack_inode_size(&btrfs_inode, total_bytes);
1218 btrfs_set_stack_inode_nlink(&btrfs_inode, 1);
1219 btrfs_set_stack_inode_nbytes(&btrfs_inode, 0);
1220 btrfs_set_stack_inode_mode(&btrfs_inode, S_IFREG | 0400);
1221 btrfs_set_stack_inode_flags(&btrfs_inode, BTRFS_INODE_NODATASUM |
1222 BTRFS_INODE_READONLY);
1223 btrfs_init_path(&path);
1224 trans = btrfs_start_transaction(root, 1);
1227 objectid = btrfs_root_dirid(&root->root_item);
1228 ret = btrfs_find_free_objectid(trans, root, objectid, &objectid);
1233 * copy blocks covered by extent #0 to new positions. extent #0 is
1234 * special, we can't rely on relocate_extents_range to relocate it.
1236 for (last_byte = 0; last_byte < first_free; last_byte += sectorsize) {
1237 ret = custom_alloc_extent(root, sectorsize, 0, &key);
1240 ret = copy_disk_extent(root, key.objectid, last_byte,
1244 ret = btrfs_record_file_extent(trans, root, objectid,
1245 &btrfs_inode, last_byte,
1246 key.objectid, sectorsize);
1252 key.objectid = last_byte;
1254 btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY);
1255 ret = btrfs_search_slot(trans, fs_info->extent_root,
1260 leaf = path.nodes[0];
1261 if (path.slots[0] >= btrfs_header_nritems(leaf)) {
1262 ret = btrfs_next_leaf(extent_root, &path);
1267 leaf = path.nodes[0];
1269 btrfs_item_key_to_cpu(leaf, &key, path.slots[0]);
1270 if (last_byte > key.objectid ||
1271 key.type != BTRFS_EXTENT_ITEM_KEY) {
1276 bytenr = key.objectid;
1277 num_bytes = key.offset;
1278 ei = btrfs_item_ptr(leaf, path.slots[0],
1279 struct btrfs_extent_item);
1280 if (!(btrfs_extent_flags(leaf, ei) & BTRFS_EXTENT_FLAG_DATA)) {
1285 BUG_ON(btrfs_item_size_nr(leaf, path.slots[0]) != sizeof(*ei) +
1286 btrfs_extent_inline_ref_size(BTRFS_EXTENT_DATA_REF_KEY));
1288 iref = (struct btrfs_extent_inline_ref *)(ei + 1);
1289 key.type = btrfs_extent_inline_ref_type(leaf, iref);
1290 BUG_ON(key.type != BTRFS_EXTENT_DATA_REF_KEY);
1291 dref = (struct btrfs_extent_data_ref *)(&iref->offset);
1292 if (btrfs_extent_data_ref_root(leaf, dref) !=
1293 BTRFS_FS_TREE_OBJECTID) {
1298 if (bytenr > last_byte) {
1299 ret = create_image_file_range(trans, root, objectid,
1300 &btrfs_inode, last_byte,
1305 ret = btrfs_record_file_extent(trans, root, objectid,
1306 &btrfs_inode, bytenr, bytenr,
1310 last_byte = bytenr + num_bytes;
1311 btrfs_release_path(&path);
1313 if (trans->blocks_used >= 4096) {
1314 ret = btrfs_commit_transaction(trans, root);
1316 trans = btrfs_start_transaction(root, 1);
1320 btrfs_release_path(&path);
1321 if (total_bytes > last_byte) {
1322 ret = create_image_file_range(trans, root, objectid,
1323 &btrfs_inode, last_byte,
1324 total_bytes, ext2_fs);
1329 ret = btrfs_insert_inode(trans, root, objectid, &btrfs_inode);
1333 location.objectid = objectid;
1334 location.offset = 0;
1335 btrfs_set_key_type(&location, BTRFS_INODE_ITEM_KEY);
1336 ret = btrfs_insert_dir_item(trans, root, name, strlen(name),
1337 btrfs_root_dirid(&root->root_item),
1338 &location, EXT2_FT_REG_FILE, objectid);
1341 ret = btrfs_insert_inode_ref(trans, root, name, strlen(name),
1343 btrfs_root_dirid(&root->root_item),
1347 location.objectid = btrfs_root_dirid(&root->root_item);
1348 location.offset = 0;
1349 btrfs_set_key_type(&location, BTRFS_INODE_ITEM_KEY);
1350 ret = btrfs_lookup_inode(trans, root, &path, &location, 1);
1353 leaf = path.nodes[0];
1354 inode_item = btrfs_item_ptr(leaf, path.slots[0],
1355 struct btrfs_inode_item);
1356 btrfs_set_inode_size(leaf, inode_item, strlen(name) * 2 +
1357 btrfs_inode_size(leaf, inode_item));
1358 btrfs_mark_buffer_dirty(leaf);
1359 btrfs_release_path(&path);
1360 ret = btrfs_commit_transaction(trans, root);
1363 btrfs_release_path(&path);
1367 static struct btrfs_root * link_subvol(struct btrfs_root *root,
1368 const char *base, u64 root_objectid)
1370 struct btrfs_trans_handle *trans;
1371 struct btrfs_fs_info *fs_info = root->fs_info;
1372 struct btrfs_root *tree_root = fs_info->tree_root;
1373 struct btrfs_root *new_root = NULL;
1374 struct btrfs_path *path;
1375 struct btrfs_inode_item *inode_item;
1376 struct extent_buffer *leaf;
1377 struct btrfs_key key;
1378 u64 dirid = btrfs_root_dirid(&root->root_item);
1380 char buf[BTRFS_NAME_LEN + 1]; /* for snprintf null */
1386 if (len < 1 || len > BTRFS_NAME_LEN)
1389 path = btrfs_alloc_path();
1392 key.objectid = dirid;
1393 key.type = BTRFS_DIR_INDEX_KEY;
1394 key.offset = (u64)-1;
1396 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1399 if (path->slots[0] > 0) {
1401 btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
1402 if (key.objectid == dirid && key.type == BTRFS_DIR_INDEX_KEY)
1403 index = key.offset + 1;
1405 btrfs_release_path(path);
1407 trans = btrfs_start_transaction(root, 1);
1410 key.objectid = dirid;
1412 key.type = BTRFS_INODE_ITEM_KEY;
1414 ret = btrfs_lookup_inode(trans, root, path, &key, 1);
1416 leaf = path->nodes[0];
1417 inode_item = btrfs_item_ptr(leaf, path->slots[0],
1418 struct btrfs_inode_item);
1420 key.objectid = root_objectid;
1421 key.offset = (u64)-1;
1422 key.type = BTRFS_ROOT_ITEM_KEY;
1424 memcpy(buf, base, len);
1425 for (i = 0; i < 1024; i++) {
1426 ret = btrfs_insert_dir_item(trans, root, buf, len,
1427 dirid, &key, BTRFS_FT_DIR, index);
1430 len = snprintf(buf, ARRAY_SIZE(buf), "%s%d", base, i);
1431 if (len < 1 || len > BTRFS_NAME_LEN) {
1439 btrfs_set_inode_size(leaf, inode_item, len * 2 +
1440 btrfs_inode_size(leaf, inode_item));
1441 btrfs_mark_buffer_dirty(leaf);
1442 btrfs_release_path(path);
1444 /* add the backref first */
1445 ret = btrfs_add_root_ref(trans, tree_root, root_objectid,
1446 BTRFS_ROOT_BACKREF_KEY,
1447 root->root_key.objectid,
1448 dirid, index, buf, len);
1451 /* now add the forward ref */
1452 ret = btrfs_add_root_ref(trans, tree_root, root->root_key.objectid,
1453 BTRFS_ROOT_REF_KEY, root_objectid,
1454 dirid, index, buf, len);
1456 ret = btrfs_commit_transaction(trans, root);
1459 new_root = btrfs_read_fs_root(fs_info, &key);
1460 if (IS_ERR(new_root))
1463 btrfs_free_path(path);
1467 static int create_chunk_mapping(struct btrfs_trans_handle *trans,
1468 struct btrfs_root *root)
1470 struct btrfs_fs_info *info = root->fs_info;
1471 struct btrfs_root *chunk_root = info->chunk_root;
1472 struct btrfs_root *extent_root = info->extent_root;
1473 struct btrfs_device *device;
1474 struct btrfs_block_group_cache *cache;
1475 struct btrfs_dev_extent *extent;
1476 struct extent_buffer *leaf;
1477 struct btrfs_chunk chunk;
1478 struct btrfs_key key;
1479 struct btrfs_path path;
1485 btrfs_init_path(&path);
1487 total_bytes = btrfs_super_total_bytes(root->fs_info->super_copy);
1488 chunk_objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID;
1490 BUG_ON(list_empty(&info->fs_devices->devices));
1491 device = list_entry(info->fs_devices->devices.next,
1492 struct btrfs_device, dev_list);
1493 BUG_ON(device->devid != info->fs_devices->latest_devid);
1495 /* delete device extent created by make_btrfs */
1496 key.objectid = device->devid;
1498 key.type = BTRFS_DEV_EXTENT_KEY;
1499 ret = btrfs_search_slot(trans, device->dev_root, &key, &path, -1, 1);
1504 ret = btrfs_del_item(trans, device->dev_root, &path);
1507 btrfs_release_path(&path);
1509 /* delete chunk item created by make_btrfs */
1510 key.objectid = chunk_objectid;
1512 key.type = BTRFS_CHUNK_ITEM_KEY;
1513 ret = btrfs_search_slot(trans, chunk_root, &key, &path, -1, 1);
1518 ret = btrfs_del_item(trans, chunk_root, &path);
1521 btrfs_release_path(&path);
1523 /* for each block group, create device extent and chunk item */
1525 while (cur_start < total_bytes) {
1526 cache = btrfs_lookup_block_group(root->fs_info, cur_start);
1529 /* insert device extent */
1530 key.objectid = device->devid;
1531 key.offset = cache->key.objectid;
1532 key.type = BTRFS_DEV_EXTENT_KEY;
1533 ret = btrfs_insert_empty_item(trans, device->dev_root, &path,
1534 &key, sizeof(*extent));
1538 leaf = path.nodes[0];
1539 extent = btrfs_item_ptr(leaf, path.slots[0],
1540 struct btrfs_dev_extent);
1542 btrfs_set_dev_extent_chunk_tree(leaf, extent,
1543 chunk_root->root_key.objectid);
1544 btrfs_set_dev_extent_chunk_objectid(leaf, extent,
1546 btrfs_set_dev_extent_chunk_offset(leaf, extent,
1547 cache->key.objectid);
1548 btrfs_set_dev_extent_length(leaf, extent, cache->key.offset);
1549 write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid,
1550 (unsigned long)btrfs_dev_extent_chunk_tree_uuid(extent),
1552 btrfs_mark_buffer_dirty(leaf);
1553 btrfs_release_path(&path);
1555 /* insert chunk item */
1556 btrfs_set_stack_chunk_length(&chunk, cache->key.offset);
1557 btrfs_set_stack_chunk_owner(&chunk,
1558 extent_root->root_key.objectid);
1559 btrfs_set_stack_chunk_stripe_len(&chunk, BTRFS_STRIPE_LEN);
1560 btrfs_set_stack_chunk_type(&chunk, cache->flags);
1561 btrfs_set_stack_chunk_io_align(&chunk, device->io_align);
1562 btrfs_set_stack_chunk_io_width(&chunk, device->io_width);
1563 btrfs_set_stack_chunk_sector_size(&chunk, device->sector_size);
1564 btrfs_set_stack_chunk_num_stripes(&chunk, 1);
1565 btrfs_set_stack_chunk_sub_stripes(&chunk, 0);
1566 btrfs_set_stack_stripe_devid(&chunk.stripe, device->devid);
1567 btrfs_set_stack_stripe_offset(&chunk.stripe,
1568 cache->key.objectid);
1569 memcpy(&chunk.stripe.dev_uuid, device->uuid, BTRFS_UUID_SIZE);
1571 key.objectid = chunk_objectid;
1572 key.offset = cache->key.objectid;
1573 key.type = BTRFS_CHUNK_ITEM_KEY;
1575 ret = btrfs_insert_item(trans, chunk_root, &key, &chunk,
1576 btrfs_chunk_item_size(1));
1580 cur_start = cache->key.objectid + cache->key.offset;
1583 device->bytes_used = total_bytes;
1584 ret = btrfs_update_device(trans, device);
1586 btrfs_release_path(&path);
1590 static int create_subvol(struct btrfs_trans_handle *trans,
1591 struct btrfs_root *root, u64 root_objectid)
1593 struct extent_buffer *tmp;
1594 struct btrfs_root *new_root;
1595 struct btrfs_key key;
1596 struct btrfs_root_item root_item;
1599 ret = btrfs_copy_root(trans, root, root->node, &tmp,
1603 memcpy(&root_item, &root->root_item, sizeof(root_item));
1604 btrfs_set_root_bytenr(&root_item, tmp->start);
1605 btrfs_set_root_level(&root_item, btrfs_header_level(tmp));
1606 btrfs_set_root_generation(&root_item, trans->transid);
1607 free_extent_buffer(tmp);
1609 key.objectid = root_objectid;
1610 key.type = BTRFS_ROOT_ITEM_KEY;
1611 key.offset = trans->transid;
1612 ret = btrfs_insert_root(trans, root->fs_info->tree_root,
1615 key.offset = (u64)-1;
1616 new_root = btrfs_read_fs_root(root->fs_info, &key);
1617 BUG_ON(!new_root || IS_ERR(new_root));
1619 ret = btrfs_make_root_dir(trans, new_root, BTRFS_FIRST_FREE_OBJECTID);
1625 static int init_btrfs(struct btrfs_root *root)
1628 struct btrfs_key location;
1629 struct btrfs_trans_handle *trans;
1630 struct btrfs_fs_info *fs_info = root->fs_info;
1631 struct extent_buffer *tmp;
1633 trans = btrfs_start_transaction(root, 1);
1635 ret = btrfs_make_block_groups(trans, root);
1638 ret = btrfs_fix_block_accounting(trans, root);
1641 ret = create_chunk_mapping(trans, root);
1644 ret = btrfs_make_root_dir(trans, fs_info->tree_root,
1645 BTRFS_ROOT_TREE_DIR_OBJECTID);
1648 memcpy(&location, &root->root_key, sizeof(location));
1649 location.offset = (u64)-1;
1650 ret = btrfs_insert_dir_item(trans, fs_info->tree_root, "default", 7,
1651 btrfs_super_root_dir(fs_info->super_copy),
1652 &location, BTRFS_FT_DIR, 0);
1655 ret = btrfs_insert_inode_ref(trans, fs_info->tree_root, "default", 7,
1657 btrfs_super_root_dir(fs_info->super_copy), 0);
1660 btrfs_set_root_dirid(&fs_info->fs_root->root_item,
1661 BTRFS_FIRST_FREE_OBJECTID);
1663 /* subvol for ext2 image file */
1664 ret = create_subvol(trans, root, EXT2_IMAGE_SUBVOL_OBJECTID);
1666 /* subvol for data relocation */
1667 ret = create_subvol(trans, root, BTRFS_DATA_RELOC_TREE_OBJECTID);
1670 extent_buffer_get(fs_info->csum_root->node);
1671 ret = __btrfs_cow_block(trans, fs_info->csum_root,
1672 fs_info->csum_root->node, NULL, 0, &tmp, 0, 0);
1674 free_extent_buffer(tmp);
1676 ret = btrfs_commit_transaction(trans, root);
1683 * Migrate super block to its default position and zero 0 ~ 16k
1685 static int migrate_super_block(int fd, u64 old_bytenr, u32 sectorsize)
1688 struct extent_buffer *buf;
1689 struct btrfs_super_block *super;
1693 BUG_ON(sectorsize < sizeof(*super));
1694 buf = malloc(sizeof(*buf) + sectorsize);
1698 buf->len = sectorsize;
1699 ret = pread(fd, buf->data, sectorsize, old_bytenr);
1700 if (ret != sectorsize)
1703 super = (struct btrfs_super_block *)buf->data;
1704 BUG_ON(btrfs_super_bytenr(super) != old_bytenr);
1705 btrfs_set_super_bytenr(super, BTRFS_SUPER_INFO_OFFSET);
1707 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
1708 ret = pwrite(fd, buf->data, sectorsize, BTRFS_SUPER_INFO_OFFSET);
1709 if (ret != sectorsize)
1716 memset(buf->data, 0, sectorsize);
1717 for (bytenr = 0; bytenr < BTRFS_SUPER_INFO_OFFSET; ) {
1718 len = BTRFS_SUPER_INFO_OFFSET - bytenr;
1719 if (len > sectorsize)
1721 ret = pwrite(fd, buf->data, len, bytenr);
1723 fprintf(stderr, "unable to zero fill device\n");
1737 static int prepare_system_chunk_sb(struct btrfs_super_block *super)
1739 struct btrfs_chunk *chunk;
1740 struct btrfs_disk_key *key;
1741 u32 sectorsize = btrfs_super_sectorsize(super);
1743 key = (struct btrfs_disk_key *)(super->sys_chunk_array);
1744 chunk = (struct btrfs_chunk *)(super->sys_chunk_array +
1745 sizeof(struct btrfs_disk_key));
1747 btrfs_set_disk_key_objectid(key, BTRFS_FIRST_CHUNK_TREE_OBJECTID);
1748 btrfs_set_disk_key_type(key, BTRFS_CHUNK_ITEM_KEY);
1749 btrfs_set_disk_key_offset(key, 0);
1751 btrfs_set_stack_chunk_length(chunk, btrfs_super_total_bytes(super));
1752 btrfs_set_stack_chunk_owner(chunk, BTRFS_EXTENT_TREE_OBJECTID);
1753 btrfs_set_stack_chunk_stripe_len(chunk, BTRFS_STRIPE_LEN);
1754 btrfs_set_stack_chunk_type(chunk, BTRFS_BLOCK_GROUP_SYSTEM);
1755 btrfs_set_stack_chunk_io_align(chunk, sectorsize);
1756 btrfs_set_stack_chunk_io_width(chunk, sectorsize);
1757 btrfs_set_stack_chunk_sector_size(chunk, sectorsize);
1758 btrfs_set_stack_chunk_num_stripes(chunk, 1);
1759 btrfs_set_stack_chunk_sub_stripes(chunk, 0);
1760 chunk->stripe.devid = super->dev_item.devid;
1761 btrfs_set_stack_stripe_offset(&chunk->stripe, 0);
1762 memcpy(chunk->stripe.dev_uuid, super->dev_item.uuid, BTRFS_UUID_SIZE);
1763 btrfs_set_super_sys_array_size(super, sizeof(*key) + sizeof(*chunk));
1767 static int prepare_system_chunk(int fd, u64 sb_bytenr, u32 sectorsize)
1770 struct extent_buffer *buf;
1771 struct btrfs_super_block *super;
1773 BUG_ON(sectorsize < sizeof(*super));
1774 buf = malloc(sizeof(*buf) + sectorsize);
1778 buf->len = sectorsize;
1779 ret = pread(fd, buf->data, sectorsize, sb_bytenr);
1780 if (ret != sectorsize)
1783 super = (struct btrfs_super_block *)buf->data;
1784 BUG_ON(btrfs_super_bytenr(super) != sb_bytenr);
1785 BUG_ON(btrfs_super_num_devices(super) != 1);
1787 ret = prepare_system_chunk_sb(super);
1791 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
1792 ret = pwrite(fd, buf->data, sectorsize, sb_bytenr);
1793 if (ret != sectorsize)
1804 static int relocate_one_reference(struct btrfs_trans_handle *trans,
1805 struct btrfs_root *root,
1806 u64 extent_start, u64 extent_size,
1807 struct btrfs_key *extent_key,
1808 struct extent_io_tree *reloc_tree)
1810 struct extent_buffer *leaf;
1811 struct btrfs_file_extent_item *fi;
1812 struct btrfs_key key;
1813 struct btrfs_path path;
1814 struct btrfs_inode_item inode;
1815 struct blk_iterate_data data;
1822 u32 sectorsize = root->sectorsize;
1828 btrfs_init_path(&path);
1829 ret = btrfs_search_slot(trans, root, extent_key, &path, -1, 1);
1833 leaf = path.nodes[0];
1834 fi = btrfs_item_ptr(leaf, path.slots[0],
1835 struct btrfs_file_extent_item);
1836 BUG_ON(btrfs_file_extent_offset(leaf, fi) > 0);
1837 if (extent_start != btrfs_file_extent_disk_bytenr(leaf, fi) ||
1838 extent_size != btrfs_file_extent_disk_num_bytes(leaf, fi)) {
1843 bytenr = extent_start + btrfs_file_extent_offset(leaf, fi);
1844 num_bytes = btrfs_file_extent_num_bytes(leaf, fi);
1846 ret = btrfs_del_item(trans, root, &path);
1850 ret = btrfs_free_extent(trans, root, extent_start, extent_size, 0,
1851 root->root_key.objectid,
1852 extent_key->objectid, extent_key->offset);
1856 btrfs_release_path(&path);
1858 key.objectid = extent_key->objectid;
1860 key.type = BTRFS_INODE_ITEM_KEY;
1861 ret = btrfs_lookup_inode(trans, root, &path, &key, 0);
1865 leaf = path.nodes[0];
1866 ptr = btrfs_item_ptr_offset(leaf, path.slots[0]);
1867 read_extent_buffer(leaf, &inode, ptr, sizeof(inode));
1868 btrfs_release_path(&path);
1870 BUG_ON(num_bytes & (sectorsize - 1));
1871 nbytes = btrfs_stack_inode_nbytes(&inode) - num_bytes;
1872 btrfs_set_stack_inode_nbytes(&inode, nbytes);
1873 datacsum = !(btrfs_stack_inode_flags(&inode) & BTRFS_INODE_NODATASUM);
1875 data = (struct blk_iterate_data) {
1879 .objectid = extent_key->objectid,
1880 .first_block = extent_key->offset / sectorsize,
1883 .boundary = (u64)-1,
1884 .checksum = datacsum,
1888 cur_offset = extent_key->offset;
1889 while (num_bytes > 0) {
1890 sector_end = bytenr + sectorsize - 1;
1891 if (test_range_bit(reloc_tree, bytenr, sector_end,
1892 EXTENT_LOCKED, 1)) {
1893 ret = get_state_private(reloc_tree, bytenr, &new_pos);
1896 ret = custom_alloc_extent(root, sectorsize, 0, &key);
1899 new_pos = key.objectid;
1901 if (cur_offset == extent_key->offset) {
1902 fd = root->fs_info->fs_devices->latest_bdev;
1903 readahead(fd, bytenr, num_bytes);
1905 ret = copy_disk_extent(root, new_pos, bytenr,
1909 ret = set_extent_bits(reloc_tree, bytenr, sector_end,
1910 EXTENT_LOCKED, GFP_NOFS);
1912 ret = set_state_private(reloc_tree, bytenr, new_pos);
1916 ret = block_iterate_proc(NULL, new_pos / sectorsize,
1917 cur_offset / sectorsize, &data);
1918 if (ret & BLOCK_ABORT) {
1923 cur_offset += sectorsize;
1924 bytenr += sectorsize;
1925 num_bytes -= sectorsize;
1928 if (data.num_blocks > 0) {
1929 ret = record_file_blocks(trans, root,
1930 extent_key->objectid, &inode,
1931 data.first_block, data.disk_block,
1932 data.num_blocks, datacsum);
1937 key.objectid = extent_key->objectid;
1939 key.type = BTRFS_INODE_ITEM_KEY;
1940 ret = btrfs_lookup_inode(trans, root, &path, &key, 1);
1944 leaf = path.nodes[0];
1945 ptr = btrfs_item_ptr_offset(leaf, path.slots[0]);
1946 write_extent_buffer(leaf, &inode, ptr, sizeof(inode));
1947 btrfs_mark_buffer_dirty(leaf);
1948 btrfs_release_path(&path);
1951 btrfs_release_path(&path);
1955 static int relocate_extents_range(struct btrfs_root *fs_root,
1956 struct btrfs_root *ext2_root,
1957 u64 start_byte, u64 end_byte)
1959 struct btrfs_fs_info *info = fs_root->fs_info;
1960 struct btrfs_root *extent_root = info->extent_root;
1961 struct btrfs_root *cur_root = NULL;
1962 struct btrfs_trans_handle *trans;
1963 struct btrfs_extent_data_ref *dref;
1964 struct btrfs_extent_inline_ref *iref;
1965 struct btrfs_extent_item *ei;
1966 struct extent_buffer *leaf;
1967 struct btrfs_key key;
1968 struct btrfs_key extent_key;
1969 struct btrfs_path path;
1970 struct extent_io_tree reloc_tree;
1980 btrfs_init_path(&path);
1981 extent_io_tree_init(&reloc_tree);
1983 key.objectid = start_byte;
1985 key.type = BTRFS_EXTENT_ITEM_KEY;
1986 ret = btrfs_search_slot(NULL, extent_root, &key, &path, 0, 0);
1990 ret = btrfs_previous_item(extent_root, &path, 0,
1991 BTRFS_EXTENT_ITEM_KEY);
1995 leaf = path.nodes[0];
1996 btrfs_item_key_to_cpu(leaf, &key, path.slots[0]);
1997 if (key.objectid + key.offset > start_byte)
1998 start_byte = key.objectid;
2001 btrfs_release_path(&path);
2003 cur_root = (pass % 2 == 0) ? ext2_root : fs_root;
2006 trans = btrfs_start_transaction(cur_root, 1);
2009 cur_byte = start_byte;
2011 key.objectid = cur_byte;
2013 key.type = BTRFS_EXTENT_ITEM_KEY;
2014 ret = btrfs_search_slot(trans, extent_root,
2019 leaf = path.nodes[0];
2020 if (path.slots[0] >= btrfs_header_nritems(leaf)) {
2021 ret = btrfs_next_leaf(extent_root, &path);
2026 leaf = path.nodes[0];
2029 btrfs_item_key_to_cpu(leaf, &key, path.slots[0]);
2030 if (key.objectid < cur_byte ||
2031 key.type != BTRFS_EXTENT_ITEM_KEY) {
2035 if (key.objectid >= end_byte)
2040 cur_byte = key.objectid;
2041 num_bytes = key.offset;
2042 ei = btrfs_item_ptr(leaf, path.slots[0],
2043 struct btrfs_extent_item);
2044 BUG_ON(!(btrfs_extent_flags(leaf, ei) &
2045 BTRFS_EXTENT_FLAG_DATA));
2047 ptr = btrfs_item_ptr_offset(leaf, path.slots[0]);
2048 end = ptr + btrfs_item_size_nr(leaf, path.slots[0]);
2050 ptr += sizeof(struct btrfs_extent_item);
2053 iref = (struct btrfs_extent_inline_ref *)ptr;
2054 key.type = btrfs_extent_inline_ref_type(leaf, iref);
2055 BUG_ON(key.type != BTRFS_EXTENT_DATA_REF_KEY);
2056 dref = (struct btrfs_extent_data_ref *)(&iref->offset);
2057 ref_root = btrfs_extent_data_ref_root(leaf, dref);
2058 extent_key.objectid =
2059 btrfs_extent_data_ref_objectid(leaf, dref);
2061 btrfs_extent_data_ref_offset(leaf, dref);
2062 extent_key.type = BTRFS_EXTENT_DATA_KEY;
2063 BUG_ON(btrfs_extent_data_ref_count(leaf, dref) != 1);
2065 if (ref_root == cur_root->root_key.objectid)
2068 ptr += btrfs_extent_inline_ref_size(key.type);
2076 ret = relocate_one_reference(trans, cur_root, cur_byte,
2077 num_bytes, &extent_key,
2082 cur_byte += num_bytes;
2083 btrfs_release_path(&path);
2085 if (trans->blocks_used >= 4096) {
2086 ret = btrfs_commit_transaction(trans, cur_root);
2088 trans = btrfs_start_transaction(cur_root, 1);
2092 btrfs_release_path(&path);
2094 ret = btrfs_commit_transaction(trans, cur_root);
2097 if (num_extents > 0 && pass++ < 16)
2100 ret = (num_extents > 0) ? -1 : 0;
2102 btrfs_release_path(&path);
2103 extent_io_tree_cleanup(&reloc_tree);
2108 * relocate data in system chunk
2110 static int cleanup_sys_chunk(struct btrfs_root *fs_root,
2111 struct btrfs_root *ext2_root)
2113 struct btrfs_block_group_cache *cache;
2119 cache = btrfs_lookup_block_group(fs_root->fs_info, offset);
2123 end_byte = cache->key.objectid + cache->key.offset;
2124 if (cache->flags & BTRFS_BLOCK_GROUP_SYSTEM) {
2125 ret = relocate_extents_range(fs_root, ext2_root,
2126 cache->key.objectid,
2133 for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
2134 offset = btrfs_sb_offset(i);
2135 offset &= ~((u64)BTRFS_STRIPE_LEN - 1);
2137 ret = relocate_extents_range(fs_root, ext2_root,
2138 offset, offset + BTRFS_STRIPE_LEN);
2147 static int fixup_chunk_mapping(struct btrfs_root *root)
2149 struct btrfs_trans_handle *trans;
2150 struct btrfs_fs_info *info = root->fs_info;
2151 struct btrfs_root *chunk_root = info->chunk_root;
2152 struct extent_buffer *leaf;
2153 struct btrfs_key key;
2154 struct btrfs_path path;
2155 struct btrfs_chunk chunk;
2161 btrfs_init_path(&path);
2163 trans = btrfs_start_transaction(root, 1);
2167 * recow the whole chunk tree. this will move all chunk tree blocks
2168 * into system block group.
2170 memset(&key, 0, sizeof(key));
2172 ret = btrfs_search_slot(trans, chunk_root, &key, &path, 0, 1);
2176 ret = btrfs_next_leaf(chunk_root, &path);
2182 btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]);
2183 btrfs_release_path(&path);
2185 btrfs_release_path(&path);
2187 /* fixup the system chunk array in super block */
2188 btrfs_set_super_sys_array_size(info->super_copy, 0);
2190 key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID;
2192 key.type = BTRFS_CHUNK_ITEM_KEY;
2194 ret = btrfs_search_slot(trans, chunk_root, &key, &path, 0, 0);
2199 leaf = path.nodes[0];
2200 if (path.slots[0] >= btrfs_header_nritems(leaf)) {
2201 ret = btrfs_next_leaf(chunk_root, &path);
2206 leaf = path.nodes[0];
2208 btrfs_item_key_to_cpu(leaf, &key, path.slots[0]);
2209 if (key.type != BTRFS_CHUNK_ITEM_KEY)
2212 ptr = btrfs_item_ptr_offset(leaf, path.slots[0]);
2213 size = btrfs_item_size_nr(leaf, path.slots[0]);
2214 BUG_ON(size != sizeof(chunk));
2215 read_extent_buffer(leaf, &chunk, ptr, size);
2216 type = btrfs_stack_chunk_type(&chunk);
2218 if (!(type & BTRFS_BLOCK_GROUP_SYSTEM))
2221 ret = btrfs_add_system_chunk(trans, chunk_root, &key,
2229 ret = btrfs_commit_transaction(trans, root);
2232 btrfs_release_path(&path);
2236 static int do_convert(const char *devname, int datacsum, int packing, int noxattr,
2237 int copylabel, const char *fslabel, int progress)
2245 ext2_filsys ext2_fs;
2246 struct btrfs_root *root;
2247 struct btrfs_root *ext2_root;
2248 struct task_ctx ctx;
2250 ret = open_ext2fs(devname, &ext2_fs);
2252 fprintf(stderr, "unable to open the Ext2fs\n");
2255 blocksize = ext2_fs->blocksize;
2256 total_bytes = (u64)ext2_fs->super->s_blocks_count * blocksize;
2257 if (blocksize < 4096) {
2258 fprintf(stderr, "block size is too small\n");
2261 if (!(ext2_fs->super->s_feature_incompat &
2262 EXT2_FEATURE_INCOMPAT_FILETYPE)) {
2263 fprintf(stderr, "filetype feature is missing\n");
2266 for (i = 0; i < 7; i++) {
2267 ret = ext2_alloc_block(ext2_fs, 0, blocks + i);
2269 fprintf(stderr, "not enough free space\n");
2272 blocks[i] *= blocksize;
2274 super_bytenr = blocks[0];
2275 fd = open(devname, O_RDWR);
2277 fprintf(stderr, "unable to open %s\n", devname);
2280 ret = make_btrfs(fd, devname, ext2_fs->super->s_volume_name,
2281 NULL, blocks, total_bytes, blocksize, blocksize,
2282 blocksize, blocksize, 0);
2284 fprintf(stderr, "unable to create initial ctree: %s\n",
2288 /* create a system chunk that maps the whole device */
2289 ret = prepare_system_chunk(fd, super_bytenr, blocksize);
2291 fprintf(stderr, "unable to update system chunk\n");
2294 root = open_ctree_fd(fd, devname, super_bytenr, OPEN_CTREE_WRITES);
2296 fprintf(stderr, "unable to open ctree\n");
2299 ret = cache_free_extents(root, ext2_fs);
2301 fprintf(stderr, "error during cache_free_extents %d\n", ret);
2304 root->fs_info->extent_ops = &extent_ops;
2305 /* recover block allocation bitmap */
2306 for (i = 0; i < 7; i++) {
2307 blocks[i] /= blocksize;
2308 ext2_free_block(ext2_fs, blocks[i]);
2310 ret = init_btrfs(root);
2312 fprintf(stderr, "unable to setup the root tree\n");
2315 printf("creating btrfs metadata.\n");
2316 ctx.max_copy_inodes = (ext2_fs->super->s_inodes_count
2317 - ext2_fs->super->s_free_inodes_count);
2318 ctx.cur_copy_inodes = 0;
2321 ctx.info = task_init(print_copied_inodes, after_copied_inodes, &ctx);
2322 task_start(ctx.info);
2324 ret = copy_inodes(root, ext2_fs, datacsum, packing, noxattr, &ctx);
2326 fprintf(stderr, "error during copy_inodes %d\n", ret);
2330 task_stop(ctx.info);
2331 task_deinit(ctx.info);
2333 printf("creating ext2fs image file.\n");
2334 ext2_root = link_subvol(root, "ext2_saved", EXT2_IMAGE_SUBVOL_OBJECTID);
2336 fprintf(stderr, "unable to create subvol\n");
2339 ret = create_ext2_image(ext2_root, ext2_fs, "image");
2341 fprintf(stderr, "error during create_ext2_image %d\n", ret);
2344 memset(root->fs_info->super_copy->label, 0, BTRFS_LABEL_SIZE);
2345 if (copylabel == 1) {
2346 strncpy(root->fs_info->super_copy->label,
2347 ext2_fs->super->s_volume_name, 16);
2348 fprintf(stderr, "copy label '%s'\n",
2349 root->fs_info->super_copy->label);
2350 } else if (copylabel == -1) {
2351 strncpy(root->fs_info->super_copy->label, fslabel, BTRFS_LABEL_SIZE);
2352 fprintf(stderr, "set label to '%s'\n", fslabel);
2355 printf("cleaning up system chunk.\n");
2356 ret = cleanup_sys_chunk(root, ext2_root);
2358 fprintf(stderr, "error during cleanup_sys_chunk %d\n", ret);
2361 ret = close_ctree(root);
2363 fprintf(stderr, "error during close_ctree %d\n", ret);
2366 close_ext2fs(ext2_fs);
2369 * If this step succeed, we get a mountable btrfs. Otherwise
2370 * the ext2fs is left unchanged.
2372 ret = migrate_super_block(fd, super_bytenr, blocksize);
2374 fprintf(stderr, "unable to migrate super block\n");
2378 root = open_ctree_fd(fd, devname, 0, OPEN_CTREE_WRITES);
2380 fprintf(stderr, "unable to open ctree\n");
2383 /* move chunk tree into system chunk. */
2384 ret = fixup_chunk_mapping(root);
2386 fprintf(stderr, "error during fixup_chunk_tree\n");
2389 ret = close_ctree(root);
2392 printf("conversion complete.\n");
2397 fprintf(stderr, "conversion aborted.\n");
2401 static int may_rollback(struct btrfs_root *root)
2403 struct btrfs_fs_info *info = root->fs_info;
2404 struct btrfs_multi_bio *multi = NULL;
2412 if (btrfs_super_num_devices(info->super_copy) != 1)
2415 bytenr = BTRFS_SUPER_INFO_OFFSET;
2416 total_bytes = btrfs_super_total_bytes(root->fs_info->super_copy);
2419 ret = btrfs_map_block(&info->mapping_tree, WRITE, bytenr,
2420 &length, &multi, 0, NULL);
2424 num_stripes = multi->num_stripes;
2425 physical = multi->stripes[0].physical;
2428 if (num_stripes != 1 || physical != bytenr)
2432 if (bytenr >= total_bytes)
2440 static int do_rollback(const char *devname)
2445 struct btrfs_root *root;
2446 struct btrfs_root *ext2_root;
2447 struct btrfs_root *chunk_root;
2448 struct btrfs_dir_item *dir;
2449 struct btrfs_inode_item *inode;
2450 struct btrfs_file_extent_item *fi;
2451 struct btrfs_trans_handle *trans;
2452 struct extent_buffer *leaf;
2453 struct btrfs_block_group_cache *cache1;
2454 struct btrfs_block_group_cache *cache2;
2455 struct btrfs_key key;
2456 struct btrfs_path path;
2457 struct extent_io_tree io_tree;
2472 extent_io_tree_init(&io_tree);
2474 fd = open(devname, O_RDWR);
2476 fprintf(stderr, "unable to open %s\n", devname);
2479 root = open_ctree_fd(fd, devname, 0, OPEN_CTREE_WRITES);
2481 fprintf(stderr, "unable to open ctree\n");
2484 ret = may_rollback(root);
2486 fprintf(stderr, "unable to do rollback\n");
2490 sectorsize = root->sectorsize;
2491 buf = malloc(sectorsize);
2493 fprintf(stderr, "unable to allocate memory\n");
2497 btrfs_init_path(&path);
2499 key.objectid = EXT2_IMAGE_SUBVOL_OBJECTID;
2500 key.type = BTRFS_ROOT_ITEM_KEY;
2501 key.offset = (u64)-1;
2502 ext2_root = btrfs_read_fs_root(root->fs_info, &key);
2503 if (!ext2_root || IS_ERR(ext2_root)) {
2504 fprintf(stderr, "unable to open subvol %llu\n",
2505 (unsigned long long)key.objectid);
2510 root_dir = btrfs_root_dirid(&root->root_item);
2511 dir = btrfs_lookup_dir_item(NULL, ext2_root, &path,
2512 root_dir, name, strlen(name), 0);
2513 if (!dir || IS_ERR(dir)) {
2514 fprintf(stderr, "unable to find file %s\n", name);
2517 leaf = path.nodes[0];
2518 btrfs_dir_item_key_to_cpu(leaf, dir, &key);
2519 btrfs_release_path(&path);
2521 objectid = key.objectid;
2523 ret = btrfs_lookup_inode(NULL, ext2_root, &path, &key, 0);
2525 fprintf(stderr, "unable to find inode item\n");
2528 leaf = path.nodes[0];
2529 inode = btrfs_item_ptr(leaf, path.slots[0], struct btrfs_inode_item);
2530 total_bytes = btrfs_inode_size(leaf, inode);
2531 btrfs_release_path(&path);
2533 key.objectid = objectid;
2535 btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY);
2536 ret = btrfs_search_slot(NULL, ext2_root, &key, &path, 0, 0);
2538 fprintf(stderr, "unable to find first file extent\n");
2539 btrfs_release_path(&path);
2543 /* build mapping tree for the relocated blocks */
2544 for (offset = 0; offset < total_bytes; ) {
2545 leaf = path.nodes[0];
2546 if (path.slots[0] >= btrfs_header_nritems(leaf)) {
2547 ret = btrfs_next_leaf(root, &path);
2553 btrfs_item_key_to_cpu(leaf, &key, path.slots[0]);
2554 if (key.objectid != objectid || key.offset != offset ||
2555 btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY)
2558 fi = btrfs_item_ptr(leaf, path.slots[0],
2559 struct btrfs_file_extent_item);
2560 if (btrfs_file_extent_type(leaf, fi) != BTRFS_FILE_EXTENT_REG)
2562 if (btrfs_file_extent_compression(leaf, fi) ||
2563 btrfs_file_extent_encryption(leaf, fi) ||
2564 btrfs_file_extent_other_encoding(leaf, fi))
2567 bytenr = btrfs_file_extent_disk_bytenr(leaf, fi);
2568 /* skip holes and direct mapped extents */
2569 if (bytenr == 0 || bytenr == offset)
2572 bytenr += btrfs_file_extent_offset(leaf, fi);
2573 num_bytes = btrfs_file_extent_num_bytes(leaf, fi);
2575 cache1 = btrfs_lookup_block_group(root->fs_info, offset);
2576 cache2 = btrfs_lookup_block_group(root->fs_info,
2577 offset + num_bytes - 1);
2578 if (!cache1 || cache1 != cache2 ||
2579 (!(cache1->flags & BTRFS_BLOCK_GROUP_SYSTEM) &&
2580 !intersect_with_sb(offset, num_bytes)))
2583 set_extent_bits(&io_tree, offset, offset + num_bytes - 1,
2584 EXTENT_LOCKED, GFP_NOFS);
2585 set_state_private(&io_tree, offset, bytenr);
2587 offset += btrfs_file_extent_num_bytes(leaf, fi);
2590 btrfs_release_path(&path);
2592 if (offset < total_bytes) {
2593 fprintf(stderr, "unable to build extent mapping\n");
2597 first_free = BTRFS_SUPER_INFO_OFFSET + 2 * sectorsize - 1;
2598 first_free &= ~((u64)sectorsize - 1);
2599 /* backup for extent #0 should exist */
2600 if(!test_range_bit(&io_tree, 0, first_free - 1, EXTENT_LOCKED, 1)) {
2601 fprintf(stderr, "no backup for the first extent\n");
2604 /* force no allocation from system block group */
2605 root->fs_info->system_allocs = -1;
2606 trans = btrfs_start_transaction(root, 1);
2609 * recow the whole chunk tree, this will remove all chunk tree blocks
2610 * from system block group
2612 chunk_root = root->fs_info->chunk_root;
2613 memset(&key, 0, sizeof(key));
2615 ret = btrfs_search_slot(trans, chunk_root, &key, &path, 0, 1);
2619 ret = btrfs_next_leaf(chunk_root, &path);
2623 btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]);
2624 btrfs_release_path(&path);
2626 btrfs_release_path(&path);
2631 cache1 = btrfs_lookup_block_group(root->fs_info, offset);
2635 if (cache1->flags & BTRFS_BLOCK_GROUP_SYSTEM)
2636 num_bytes += btrfs_block_group_used(&cache1->item);
2638 offset = cache1->key.objectid + cache1->key.offset;
2640 /* only extent #0 left in system block group? */
2641 if (num_bytes > first_free) {
2642 fprintf(stderr, "unable to empty system block group\n");
2645 /* create a system chunk that maps the whole device */
2646 ret = prepare_system_chunk_sb(root->fs_info->super_copy);
2648 fprintf(stderr, "unable to update system chunk\n");
2652 ret = btrfs_commit_transaction(trans, root);
2655 ret = close_ctree(root);
2657 fprintf(stderr, "error during close_ctree %d\n", ret);
2661 /* zero btrfs super block mirrors */
2662 memset(buf, 0, sectorsize);
2663 for (i = 1 ; i < BTRFS_SUPER_MIRROR_MAX; i++) {
2664 bytenr = btrfs_sb_offset(i);
2665 if (bytenr >= total_bytes)
2667 ret = pwrite(fd, buf, sectorsize, bytenr);
2670 sb_bytenr = (u64)-1;
2671 /* copy all relocated blocks back */
2673 ret = find_first_extent_bit(&io_tree, 0, &start, &end,
2678 ret = get_state_private(&io_tree, start, &bytenr);
2681 clear_extent_bits(&io_tree, start, end, EXTENT_LOCKED,
2684 while (start <= end) {
2685 if (start == BTRFS_SUPER_INFO_OFFSET) {
2689 ret = pread(fd, buf, sectorsize, bytenr);
2691 fprintf(stderr, "error during pread %d\n", ret);
2694 BUG_ON(ret != sectorsize);
2695 ret = pwrite(fd, buf, sectorsize, start);
2697 fprintf(stderr, "error during pwrite %d\n", ret);
2700 BUG_ON(ret != sectorsize);
2702 start += sectorsize;
2703 bytenr += sectorsize;
2709 fprintf(stderr, "error during fsync %d\n", ret);
2713 * finally, overwrite btrfs super block.
2715 ret = pread(fd, buf, sectorsize, sb_bytenr);
2717 fprintf(stderr, "error during pread %d\n", ret);
2720 BUG_ON(ret != sectorsize);
2721 ret = pwrite(fd, buf, sectorsize, BTRFS_SUPER_INFO_OFFSET);
2723 fprintf(stderr, "error during pwrite %d\n", ret);
2726 BUG_ON(ret != sectorsize);
2729 fprintf(stderr, "error during fsync %d\n", ret);
2735 extent_io_tree_cleanup(&io_tree);
2736 printf("rollback complete.\n");
2743 fprintf(stderr, "rollback aborted.\n");
2747 static void print_usage(void)
2749 printf("usage: btrfs-convert [-d] [-i] [-n] [-r] [-l label] [-L] device\n");
2750 printf("\t-d disable data checksum\n");
2751 printf("\t-i ignore xattrs and ACLs\n");
2752 printf("\t-n disable packing of small files\n");
2753 printf("\t-r roll back to ext2fs\n");
2754 printf("\t-l LABEL set filesystem label\n");
2755 printf("\t-L use label from converted fs\n");
2756 printf("\t-p show converting progress\n");
2759 int main(int argc, char *argv[])
2767 int usage_error = 0;
2770 char *fslabel = NULL;
2773 int c = getopt(argc, argv, "dinrl:Lp");
2791 fslabel = strdup(optarg);
2792 if (strlen(fslabel) > BTRFS_LABEL_SIZE) {
2794 "warning: label too long, trimmed to %d bytes\n",
2796 fslabel[BTRFS_LABEL_SIZE] = 0;
2810 argc = argc - optind;
2812 if (check_argc_exact(argc, 1)) {
2817 if (rollback && (!datacsum || noxattr || !packing)) {
2819 "Usage error: -d, -i, -n options do not apply to rollback\n");
2828 file = argv[optind];
2829 ret = check_mounted(file);
2831 fprintf(stderr, "Could not check mount status: %s\n",
2835 fprintf(stderr, "%s is mounted\n", file);
2840 ret = do_rollback(file);
2842 ret = do_convert(file, datacsum, packing, noxattr, copylabel, fslabel, progress);