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 <ext2fs/ext2_fs.h>
42 #include <ext2fs/ext2fs.h>
43 #include <ext2fs/ext2_ext_attr.h>
45 #define INO_OFFSET (BTRFS_FIRST_FREE_OBJECTID - EXT2_ROOT_INO)
46 #define STRIPE_LEN (64 * 1024)
47 #define EXT2_IMAGE_SUBVOL_OBJECTID BTRFS_FIRST_FREE_OBJECTID
50 * Open Ext2fs in readonly mode, read block allocation bitmap and
51 * inode bitmap into memory.
53 static int open_ext2fs(const char *name, ext2_filsys *ret_fs)
58 ret = ext2fs_open(name, 0, 0, 0, unix_io_manager, &ext2_fs);
60 fprintf(stderr, "ext2fs_open: %s\n", error_message(ret));
63 ret = ext2fs_read_inode_bitmap(ext2_fs);
65 fprintf(stderr, "ext2fs_read_inode_bitmap: %s\n",
69 ret = ext2fs_read_block_bitmap(ext2_fs);
71 fprintf(stderr, "ext2fs_read_block_bitmap: %s\n",
76 * search each block group for a free inode. this set up
77 * uninit block/inode bitmaps appropriately.
80 while (ino <= ext2_fs->super->s_inodes_count) {
82 ext2fs_new_inode(ext2_fs, ino, 0, NULL, &foo);
83 ino += EXT2_INODES_PER_GROUP(ext2_fs->super);
92 static int close_ext2fs(ext2_filsys fs)
98 static int ext2_alloc_block(ext2_filsys fs, u64 goal, u64 *block_ret)
102 if (!ext2fs_new_block(fs, goal, NULL, &block)) {
103 ext2fs_fast_mark_block_bitmap(fs->block_map, block);
110 static int ext2_free_block(ext2_filsys fs, u64 block)
112 BUG_ON(block != (blk_t)block);
113 ext2fs_fast_unmark_block_bitmap(fs->block_map, block);
117 static int cache_free_extents(struct btrfs_root *root, ext2_filsys ext2_fs)
123 u64 blocksize = ext2_fs->blocksize;
125 block = ext2_fs->super->s_first_data_block;
126 for (; block < ext2_fs->super->s_blocks_count; block++) {
127 if (ext2fs_fast_test_block_bitmap(ext2_fs->block_map, block))
129 bytenr = block * blocksize;
130 ret = set_extent_dirty(&root->fs_info->free_space_cache,
131 bytenr, bytenr + blocksize - 1, 0);
135 for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
136 bytenr = btrfs_sb_offset(i);
137 bytenr &= ~((u64)STRIPE_LEN - 1);
138 if (bytenr >= blocksize * ext2_fs->super->s_blocks_count)
140 clear_extent_dirty(&root->fs_info->free_space_cache, bytenr,
141 bytenr + STRIPE_LEN - 1, 0);
144 clear_extent_dirty(&root->fs_info->free_space_cache,
145 0, BTRFS_SUPER_INFO_OFFSET - 1, 0);
150 static int custom_alloc_extent(struct btrfs_root *root, u64 num_bytes,
151 u64 hint_byte, struct btrfs_key *ins)
155 u64 last = hint_byte;
158 struct btrfs_block_group_cache *cache;
161 ret = find_first_extent_bit(&root->fs_info->free_space_cache,
162 last, &start, &end, EXTENT_DIRTY);
164 if (wrapped++ == 0) {
172 start = max(last, start);
174 if (last - start < num_bytes)
177 last = start + num_bytes;
178 if (test_range_bit(&root->fs_info->pinned_extents,
179 start, last - 1, EXTENT_DIRTY, 0))
182 cache = btrfs_lookup_block_group(root->fs_info, start);
184 if (cache->flags & BTRFS_BLOCK_GROUP_SYSTEM ||
185 last > cache->key.objectid + cache->key.offset) {
186 last = cache->key.objectid + cache->key.offset;
190 clear_extent_dirty(&root->fs_info->free_space_cache,
191 start, start + num_bytes - 1, 0);
193 ins->objectid = start;
194 ins->offset = num_bytes;
195 ins->type = BTRFS_EXTENT_ITEM_KEY;
199 fprintf(stderr, "not enough free space\n");
203 static int intersect_with_sb(u64 bytenr, u64 num_bytes)
208 for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
209 offset = btrfs_sb_offset(i);
210 offset &= ~((u64)STRIPE_LEN - 1);
212 if (bytenr < offset + STRIPE_LEN &&
213 bytenr + num_bytes > offset)
219 static int custom_free_extent(struct btrfs_root *root, u64 bytenr,
222 return intersect_with_sb(bytenr, num_bytes);
225 static struct btrfs_extent_ops extent_ops = {
226 .alloc_extent = custom_alloc_extent,
227 .free_extent = custom_free_extent,
230 struct dir_iterate_data {
231 struct btrfs_trans_handle *trans;
232 struct btrfs_root *root;
233 struct btrfs_inode_item *inode;
240 static u8 filetype_conversion_table[EXT2_FT_MAX] = {
241 [EXT2_FT_UNKNOWN] = BTRFS_FT_UNKNOWN,
242 [EXT2_FT_REG_FILE] = BTRFS_FT_REG_FILE,
243 [EXT2_FT_DIR] = BTRFS_FT_DIR,
244 [EXT2_FT_CHRDEV] = BTRFS_FT_CHRDEV,
245 [EXT2_FT_BLKDEV] = BTRFS_FT_BLKDEV,
246 [EXT2_FT_FIFO] = BTRFS_FT_FIFO,
247 [EXT2_FT_SOCK] = BTRFS_FT_SOCK,
248 [EXT2_FT_SYMLINK] = BTRFS_FT_SYMLINK,
251 static int dir_iterate_proc(ext2_ino_t dir, int entry,
252 struct ext2_dir_entry *dirent,
253 int offset, int blocksize,
254 char *buf,void *priv_data)
260 char dotdot[] = "..";
261 struct btrfs_key location;
262 struct dir_iterate_data *idata = (struct dir_iterate_data *)priv_data;
265 name_len = dirent->name_len & 0xFF;
267 objectid = dirent->inode + INO_OFFSET;
268 if (!strncmp(dirent->name, dotdot, name_len)) {
270 BUG_ON(idata->parent != 0);
271 idata->parent = objectid;
275 if (dirent->inode < EXT2_GOOD_OLD_FIRST_INO)
278 location.objectid = objectid;
280 btrfs_set_key_type(&location, BTRFS_INODE_ITEM_KEY);
282 file_type = dirent->name_len >> 8;
283 BUG_ON(file_type > EXT2_FT_SYMLINK);
284 ret = btrfs_insert_dir_item(idata->trans, idata->root,
285 dirent->name, name_len,
286 idata->objectid, &location,
287 filetype_conversion_table[file_type],
291 ret = btrfs_insert_inode_ref(idata->trans, idata->root,
292 dirent->name, name_len,
293 objectid, idata->objectid,
298 inode_size = btrfs_stack_inode_size(idata->inode) +
300 btrfs_set_stack_inode_size(idata->inode, inode_size);
303 idata->errcode = ret;
307 static int create_dir_entries(struct btrfs_trans_handle *trans,
308 struct btrfs_root *root, u64 objectid,
309 struct btrfs_inode_item *btrfs_inode,
310 ext2_filsys ext2_fs, ext2_ino_t ext2_ino)
314 struct dir_iterate_data data = {
317 .inode = btrfs_inode,
318 .objectid = objectid,
324 err = ext2fs_dir_iterate2(ext2_fs, ext2_ino, 0, NULL,
325 dir_iterate_proc, &data);
329 if (ret == 0 && data.parent == objectid) {
330 ret = btrfs_insert_inode_ref(trans, root, "..", 2,
331 objectid, objectid, 0);
335 fprintf(stderr, "ext2fs_dir_iterate2: %s\n", error_message(err));
339 static int read_disk_extent(struct btrfs_root *root, u64 bytenr,
340 u32 num_bytes, char *buffer)
343 struct btrfs_fs_devices *fs_devs = root->fs_info->fs_devices;
345 ret = pread(fs_devs->latest_bdev, buffer, num_bytes, bytenr);
346 if (ret != num_bytes)
355 static int csum_disk_extent(struct btrfs_trans_handle *trans,
356 struct btrfs_root *root,
357 u64 disk_bytenr, u64 num_bytes)
359 u32 blocksize = root->sectorsize;
364 buffer = malloc(blocksize);
367 for (offset = 0; offset < num_bytes; offset += blocksize) {
368 ret = read_disk_extent(root, disk_bytenr + offset,
372 ret = btrfs_csum_file_block(trans,
373 root->fs_info->csum_root,
374 disk_bytenr + num_bytes,
375 disk_bytenr + offset,
384 static int record_file_blocks(struct btrfs_trans_handle *trans,
385 struct btrfs_root *root, u64 objectid,
386 struct btrfs_inode_item *inode,
387 u64 file_block, u64 disk_block,
388 u64 num_blocks, int checksum)
391 u64 file_pos = file_block * root->sectorsize;
392 u64 disk_bytenr = disk_block * root->sectorsize;
393 u64 num_bytes = num_blocks * root->sectorsize;
394 ret = btrfs_record_file_extent(trans, root, objectid, inode, file_pos,
395 disk_bytenr, num_bytes);
397 if (ret || !checksum)
400 return csum_disk_extent(trans, root, disk_bytenr, num_bytes);
403 struct blk_iterate_data {
404 struct btrfs_trans_handle *trans;
405 struct btrfs_root *root;
406 struct btrfs_inode_item *inode;
416 static int block_iterate_proc(ext2_filsys ext2_fs,
417 u64 disk_block, u64 file_block,
418 struct blk_iterate_data *idata)
423 struct btrfs_root *root = idata->root;
424 struct btrfs_trans_handle *trans = idata->trans;
425 struct btrfs_block_group_cache *cache;
426 u64 bytenr = disk_block * root->sectorsize;
428 sb_region = intersect_with_sb(bytenr, root->sectorsize);
429 do_barrier = sb_region || disk_block >= idata->boundary;
430 if ((idata->num_blocks > 0 && do_barrier) ||
431 (file_block > idata->first_block + idata->num_blocks) ||
432 (disk_block != idata->disk_block + idata->num_blocks)) {
433 if (idata->num_blocks > 0) {
434 ret = record_file_blocks(trans, root, idata->objectid,
435 idata->inode, idata->first_block,
436 idata->disk_block, idata->num_blocks,
440 idata->first_block += idata->num_blocks;
441 idata->num_blocks = 0;
443 if (file_block > idata->first_block) {
444 ret = record_file_blocks(trans, root, idata->objectid,
445 idata->inode, idata->first_block,
446 0, file_block - idata->first_block,
453 bytenr += STRIPE_LEN - 1;
454 bytenr &= ~((u64)STRIPE_LEN - 1);
456 cache = btrfs_lookup_block_group(root->fs_info, bytenr);
458 bytenr = cache->key.objectid + cache->key.offset;
461 idata->first_block = file_block;
462 idata->disk_block = disk_block;
463 idata->boundary = bytenr / root->sectorsize;
468 idata->errcode = ret;
472 static int __block_iterate_proc(ext2_filsys fs, blk_t *blocknr,
473 e2_blkcnt_t blockcnt, blk_t ref_block,
474 int ref_offset, void *priv_data)
476 struct blk_iterate_data *idata;
477 idata = (struct blk_iterate_data *)priv_data;
478 return block_iterate_proc(fs, *blocknr, blockcnt, idata);
482 * traverse file's data blocks, record these data blocks as file extents.
484 static int create_file_extents(struct btrfs_trans_handle *trans,
485 struct btrfs_root *root, u64 objectid,
486 struct btrfs_inode_item *btrfs_inode,
487 ext2_filsys ext2_fs, ext2_ino_t ext2_ino,
488 int datacsum, int packing)
494 u32 sectorsize = root->sectorsize;
495 u64 inode_size = btrfs_stack_inode_size(btrfs_inode);
496 struct blk_iterate_data data = {
499 .inode = btrfs_inode,
500 .objectid = objectid,
505 .checksum = datacsum,
508 err = ext2fs_block_iterate2(ext2_fs, ext2_ino, BLOCK_FLAG_DATA_ONLY,
509 NULL, __block_iterate_proc, &data);
515 if (packing && data.first_block == 0 && data.num_blocks > 0 &&
516 inode_size <= BTRFS_MAX_INLINE_DATA_SIZE(root)) {
517 u64 num_bytes = data.num_blocks * sectorsize;
518 u64 disk_bytenr = data.disk_block * sectorsize;
521 buffer = malloc(num_bytes);
524 ret = read_disk_extent(root, disk_bytenr, num_bytes, buffer);
527 if (num_bytes > inode_size)
528 num_bytes = inode_size;
529 ret = btrfs_insert_inline_extent(trans, root, objectid,
530 0, buffer, num_bytes);
533 nbytes = btrfs_stack_inode_nbytes(btrfs_inode) + num_bytes;
534 btrfs_set_stack_inode_nbytes(btrfs_inode, nbytes);
535 } else if (data.num_blocks > 0) {
536 ret = record_file_blocks(trans, root, objectid, btrfs_inode,
537 data.first_block, data.disk_block,
538 data.num_blocks, data.checksum);
542 data.first_block += data.num_blocks;
543 last_block = (inode_size + sectorsize - 1) / sectorsize;
544 if (last_block > data.first_block) {
545 ret = record_file_blocks(trans, root, objectid, btrfs_inode,
546 data.first_block, 0, last_block -
547 data.first_block, data.checksum);
554 fprintf(stderr, "ext2fs_block_iterate2: %s\n", error_message(err));
558 static int create_symbol_link(struct btrfs_trans_handle *trans,
559 struct btrfs_root *root, u64 objectid,
560 struct btrfs_inode_item *btrfs_inode,
561 ext2_filsys ext2_fs, ext2_ino_t ext2_ino,
562 struct ext2_inode *ext2_inode)
566 u64 inode_size = btrfs_stack_inode_size(btrfs_inode);
567 if (ext2fs_inode_data_blocks(ext2_fs, ext2_inode)) {
568 btrfs_set_stack_inode_size(btrfs_inode, inode_size + 1);
569 ret = create_file_extents(trans, root, objectid, btrfs_inode,
570 ext2_fs, ext2_ino, 1, 1);
571 btrfs_set_stack_inode_size(btrfs_inode, inode_size);
575 pathname = (char *)&(ext2_inode->i_block[0]);
576 BUG_ON(pathname[inode_size] != 0);
577 ret = btrfs_insert_inline_extent(trans, root, objectid, 0,
578 pathname, inode_size + 1);
579 btrfs_set_stack_inode_nbytes(btrfs_inode, inode_size + 1);
584 * Following xattr/acl related codes are based on codes in
585 * fs/ext3/xattr.c and fs/ext3/acl.c
587 #define EXT2_XATTR_BHDR(ptr) ((struct ext2_ext_attr_header *)(ptr))
588 #define EXT2_XATTR_BFIRST(ptr) \
589 ((struct ext2_ext_attr_entry *)(EXT2_XATTR_BHDR(ptr) + 1))
590 #define EXT2_XATTR_IHDR(inode) \
591 ((struct ext2_ext_attr_header *) ((void *)(inode) + \
592 EXT2_GOOD_OLD_INODE_SIZE + (inode)->i_extra_isize))
593 #define EXT2_XATTR_IFIRST(inode) \
594 ((struct ext2_ext_attr_entry *) ((void *)EXT2_XATTR_IHDR(inode) + \
595 sizeof(EXT2_XATTR_IHDR(inode)->h_magic)))
597 static int ext2_xattr_check_names(struct ext2_ext_attr_entry *entry,
600 struct ext2_ext_attr_entry *next;
602 while (!EXT2_EXT_IS_LAST_ENTRY(entry)) {
603 next = EXT2_EXT_ATTR_NEXT(entry);
604 if ((void *)next >= end)
611 static int ext2_xattr_check_block(const char *buf, size_t size)
614 struct ext2_ext_attr_header *header = EXT2_XATTR_BHDR(buf);
616 if (header->h_magic != EXT2_EXT_ATTR_MAGIC ||
617 header->h_blocks != 1)
619 error = ext2_xattr_check_names(EXT2_XATTR_BFIRST(buf), buf + size);
623 static int ext2_xattr_check_entry(struct ext2_ext_attr_entry *entry,
626 size_t value_size = entry->e_value_size;
628 if (entry->e_value_block != 0 || value_size > size ||
629 entry->e_value_offs + value_size > size)
634 #define EXT2_ACL_VERSION 0x0001
645 } ext2_acl_entry_short;
651 static inline int ext2_acl_count(size_t size)
654 size -= sizeof(ext2_acl_header);
655 s = size - 4 * sizeof(ext2_acl_entry_short);
657 if (size % sizeof(ext2_acl_entry_short))
659 return size / sizeof(ext2_acl_entry_short);
661 if (s % sizeof(ext2_acl_entry))
663 return s / sizeof(ext2_acl_entry) + 4;
667 #define ACL_EA_VERSION 0x0002
677 acl_ea_entry a_entries[0];
680 static inline size_t acl_ea_size(int count)
682 return sizeof(acl_ea_header) + count * sizeof(acl_ea_entry);
685 static int ext2_acl_to_xattr(void *dst, const void *src,
686 size_t dst_size, size_t src_size)
689 const void *end = src + src_size;
690 acl_ea_header *ext_acl = (acl_ea_header *)dst;
691 acl_ea_entry *dst_entry = ext_acl->a_entries;
692 ext2_acl_entry *src_entry;
694 if (src_size < sizeof(ext2_acl_header))
696 if (((ext2_acl_header *)src)->a_version !=
697 cpu_to_le32(EXT2_ACL_VERSION))
699 src += sizeof(ext2_acl_header);
700 count = ext2_acl_count(src_size);
704 BUG_ON(dst_size < acl_ea_size(count));
705 ext_acl->a_version = cpu_to_le32(ACL_EA_VERSION);
706 for (i = 0; i < count; i++, dst_entry++) {
707 src_entry = (ext2_acl_entry *)src;
708 if (src + sizeof(ext2_acl_entry_short) > end)
710 dst_entry->e_tag = src_entry->e_tag;
711 dst_entry->e_perm = src_entry->e_perm;
712 switch (le16_to_cpu(src_entry->e_tag)) {
717 src += sizeof(ext2_acl_entry_short);
718 dst_entry->e_id = cpu_to_le32(ACL_UNDEFINED_ID);
722 src += sizeof(ext2_acl_entry);
725 dst_entry->e_id = src_entry->e_id;
738 static char *xattr_prefix_table[] = {
740 [2] = "system.posix_acl_access",
741 [3] = "system.posix_acl_default",
746 static int copy_single_xattr(struct btrfs_trans_handle *trans,
747 struct btrfs_root *root, u64 objectid,
748 struct ext2_ext_attr_entry *entry,
749 const void *data, u32 datalen)
754 void *databuf = NULL;
755 char namebuf[XATTR_NAME_MAX + 1];
757 name_index = entry->e_name_index;
758 if (name_index >= ARRAY_SIZE(xattr_prefix_table) ||
759 xattr_prefix_table[name_index] == NULL)
761 name_len = strlen(xattr_prefix_table[name_index]) +
763 if (name_len >= sizeof(namebuf))
766 if (name_index == 2 || name_index == 3) {
767 size_t bufsize = acl_ea_size(ext2_acl_count(datalen));
768 databuf = malloc(bufsize);
771 ret = ext2_acl_to_xattr(databuf, data, bufsize, datalen);
777 strncpy(namebuf, xattr_prefix_table[name_index], XATTR_NAME_MAX);
778 strncat(namebuf, EXT2_EXT_ATTR_NAME(entry), entry->e_name_len);
779 if (name_len + datalen > BTRFS_LEAF_DATA_SIZE(root) -
780 sizeof(struct btrfs_item) - sizeof(struct btrfs_dir_item)) {
781 fprintf(stderr, "skip large xattr on inode %Lu name %.*s\n",
782 objectid - INO_OFFSET, name_len, namebuf);
785 ret = btrfs_insert_xattr_item(trans, root, namebuf, name_len,
786 data, datalen, objectid);
793 static int copy_extended_attrs(struct btrfs_trans_handle *trans,
794 struct btrfs_root *root, u64 objectid,
795 struct btrfs_inode_item *btrfs_inode,
796 ext2_filsys ext2_fs, ext2_ino_t ext2_ino)
802 u32 block_size = ext2_fs->blocksize;
803 u32 inode_size = EXT2_INODE_SIZE(ext2_fs->super);
804 struct ext2_inode_large *ext2_inode;
805 struct ext2_ext_attr_entry *entry;
808 char inode_buf[EXT2_GOOD_OLD_INODE_SIZE];
810 if (inode_size <= EXT2_GOOD_OLD_INODE_SIZE) {
811 ext2_inode = (struct ext2_inode_large *)inode_buf;
813 ext2_inode = (struct ext2_inode_large *)malloc(inode_size);
817 err = ext2fs_read_inode_full(ext2_fs, ext2_ino, (void *)ext2_inode,
820 fprintf(stderr, "ext2fs_read_inode_full: %s\n",
826 if (ext2_ino > ext2_fs->super->s_first_ino &&
827 inode_size > EXT2_GOOD_OLD_INODE_SIZE) {
828 if (EXT2_GOOD_OLD_INODE_SIZE +
829 ext2_inode->i_extra_isize > inode_size) {
833 if (ext2_inode->i_extra_isize != 0 &&
834 EXT2_XATTR_IHDR(ext2_inode)->h_magic ==
835 EXT2_EXT_ATTR_MAGIC) {
841 void *end = (void *)ext2_inode + inode_size;
842 entry = EXT2_XATTR_IFIRST(ext2_inode);
843 total = end - (void *)entry;
844 ret = ext2_xattr_check_names(entry, end);
847 while (!EXT2_EXT_IS_LAST_ENTRY(entry)) {
848 ret = ext2_xattr_check_entry(entry, total);
851 data = (void *)EXT2_XATTR_IFIRST(ext2_inode) +
853 datalen = entry->e_value_size;
854 ret = copy_single_xattr(trans, root, objectid,
855 entry, data, datalen);
858 entry = EXT2_EXT_ATTR_NEXT(entry);
862 if (ext2_inode->i_file_acl == 0)
865 buffer = malloc(block_size);
870 err = ext2fs_read_ext_attr(ext2_fs, ext2_inode->i_file_acl, buffer);
872 fprintf(stderr, "ext2fs_read_ext_attr: %s\n",
877 ret = ext2_xattr_check_block(buffer, block_size);
881 entry = EXT2_XATTR_BFIRST(buffer);
882 while (!EXT2_EXT_IS_LAST_ENTRY(entry)) {
883 ret = ext2_xattr_check_entry(entry, block_size);
886 data = buffer + entry->e_value_offs;
887 datalen = entry->e_value_size;
888 ret = copy_single_xattr(trans, root, objectid,
889 entry, data, datalen);
892 entry = EXT2_EXT_ATTR_NEXT(entry);
897 if ((void *)ext2_inode != inode_buf)
902 #define MKDEV(ma, mi) (((ma) << MINORBITS) | (mi))
904 static inline dev_t old_decode_dev(u16 val)
906 return MKDEV((val >> 8) & 255, val & 255);
909 static inline dev_t new_decode_dev(u32 dev)
911 unsigned major = (dev & 0xfff00) >> 8;
912 unsigned minor = (dev & 0xff) | ((dev >> 12) & 0xfff00);
913 return MKDEV(major, minor);
916 static int copy_inode_item(struct btrfs_inode_item *dst,
917 struct ext2_inode *src, u32 blocksize)
919 btrfs_set_stack_inode_generation(dst, 1);
920 btrfs_set_stack_inode_size(dst, src->i_size);
921 btrfs_set_stack_inode_nbytes(dst, 0);
922 btrfs_set_stack_inode_block_group(dst, 0);
923 btrfs_set_stack_inode_nlink(dst, src->i_links_count);
924 btrfs_set_stack_inode_uid(dst, src->i_uid | (src->i_uid_high << 16));
925 btrfs_set_stack_inode_gid(dst, src->i_gid | (src->i_gid_high << 16));
926 btrfs_set_stack_inode_mode(dst, src->i_mode);
927 btrfs_set_stack_inode_rdev(dst, 0);
928 btrfs_set_stack_inode_flags(dst, 0);
929 btrfs_set_stack_timespec_sec(&dst->atime, src->i_atime);
930 btrfs_set_stack_timespec_nsec(&dst->atime, 0);
931 btrfs_set_stack_timespec_sec(&dst->ctime, src->i_ctime);
932 btrfs_set_stack_timespec_nsec(&dst->ctime, 0);
933 btrfs_set_stack_timespec_sec(&dst->mtime, src->i_mtime);
934 btrfs_set_stack_timespec_nsec(&dst->mtime, 0);
935 btrfs_set_stack_timespec_sec(&dst->otime, 0);
936 btrfs_set_stack_timespec_nsec(&dst->otime, 0);
938 if (S_ISDIR(src->i_mode)) {
939 btrfs_set_stack_inode_size(dst, 0);
940 btrfs_set_stack_inode_nlink(dst, 1);
942 if (S_ISREG(src->i_mode)) {
943 btrfs_set_stack_inode_size(dst, (u64)src->i_size_high << 32 |
946 if (!S_ISREG(src->i_mode) && !S_ISDIR(src->i_mode) &&
947 !S_ISLNK(src->i_mode)) {
948 if (src->i_block[0]) {
949 btrfs_set_stack_inode_rdev(dst,
950 old_decode_dev(src->i_block[0]));
952 btrfs_set_stack_inode_rdev(dst,
953 new_decode_dev(src->i_block[1]));
960 * copy a single inode. do all the required works, such as cloning
961 * inode item, creating file extents and creating directory entries.
963 static int copy_single_inode(struct btrfs_trans_handle *trans,
964 struct btrfs_root *root, u64 objectid,
965 ext2_filsys ext2_fs, ext2_ino_t ext2_ino,
966 struct ext2_inode *ext2_inode,
967 int datacsum, int packing, int noxattr)
970 struct btrfs_key inode_key;
971 struct btrfs_inode_item btrfs_inode;
973 if (ext2_inode->i_links_count == 0)
976 copy_inode_item(&btrfs_inode, ext2_inode, ext2_fs->blocksize);
977 if (!datacsum && S_ISREG(ext2_inode->i_mode)) {
978 u32 flags = btrfs_stack_inode_flags(&btrfs_inode) |
979 BTRFS_INODE_NODATASUM;
980 btrfs_set_stack_inode_flags(&btrfs_inode, flags);
983 switch (ext2_inode->i_mode & S_IFMT) {
985 ret = create_file_extents(trans, root, objectid, &btrfs_inode,
986 ext2_fs, ext2_ino, datacsum, packing);
989 ret = create_dir_entries(trans, root, objectid, &btrfs_inode,
993 ret = create_symbol_link(trans, root, objectid, &btrfs_inode,
994 ext2_fs, ext2_ino, ext2_inode);
1004 ret = copy_extended_attrs(trans, root, objectid, &btrfs_inode,
1009 inode_key.objectid = objectid;
1010 inode_key.offset = 0;
1011 btrfs_set_key_type(&inode_key, BTRFS_INODE_ITEM_KEY);
1012 ret = btrfs_insert_inode(trans, root, objectid, &btrfs_inode);
1016 static int copy_disk_extent(struct btrfs_root *root, u64 dst_bytenr,
1017 u64 src_bytenr, u32 num_bytes)
1021 struct btrfs_fs_devices *fs_devs = root->fs_info->fs_devices;
1023 buffer = malloc(num_bytes);
1026 ret = pread(fs_devs->latest_bdev, buffer, num_bytes, src_bytenr);
1027 if (ret != num_bytes)
1029 ret = pwrite(fs_devs->latest_bdev, buffer, num_bytes, dst_bytenr);
1030 if (ret != num_bytes)
1040 * scan ext2's inode bitmap and copy all used inodes.
1042 static int copy_inodes(struct btrfs_root *root, ext2_filsys ext2_fs,
1043 int datacsum, int packing, int noxattr)
1047 ext2_inode_scan ext2_scan;
1048 struct ext2_inode ext2_inode;
1049 ext2_ino_t ext2_ino;
1051 struct btrfs_trans_handle *trans;
1053 trans = btrfs_start_transaction(root, 1);
1056 err = ext2fs_open_inode_scan(ext2_fs, 0, &ext2_scan);
1058 fprintf(stderr, "ext2fs_open_inode_scan: %s\n", error_message(err));
1061 while (!(err = ext2fs_get_next_inode(ext2_scan, &ext2_ino,
1063 /* no more inodes */
1066 /* skip special inode in ext2fs */
1067 if (ext2_ino < EXT2_GOOD_OLD_FIRST_INO &&
1068 ext2_ino != EXT2_ROOT_INO)
1070 objectid = ext2_ino + INO_OFFSET;
1071 ret = copy_single_inode(trans, root,
1072 objectid, ext2_fs, ext2_ino,
1073 &ext2_inode, datacsum, packing,
1077 if (trans->blocks_used >= 4096) {
1078 ret = btrfs_commit_transaction(trans, root);
1080 trans = btrfs_start_transaction(root, 1);
1085 fprintf(stderr, "ext2fs_get_next_inode: %s\n", error_message(err));
1088 ret = btrfs_commit_transaction(trans, root);
1095 * Construct a range of ext2fs image file.
1096 * scan block allocation bitmap, find all blocks used by the ext2fs
1097 * in this range and create file extents that point to these blocks.
1099 * Note: Before calling the function, no file extent points to blocks
1102 static int create_image_file_range(struct btrfs_trans_handle *trans,
1103 struct btrfs_root *root, u64 objectid,
1104 struct btrfs_inode_item *inode,
1105 u64 start_byte, u64 end_byte,
1106 ext2_filsys ext2_fs)
1108 u32 blocksize = ext2_fs->blocksize;
1109 u32 block = start_byte / blocksize;
1110 u32 last_block = (end_byte + blocksize - 1) / blocksize;
1112 struct blk_iterate_data data = {
1116 .objectid = objectid,
1117 .first_block = block,
1120 .boundary = (u64)-1,
1124 for (; start_byte < end_byte; block++, start_byte += blocksize) {
1125 if (!ext2fs_fast_test_block_bitmap(ext2_fs->block_map, block))
1127 ret = block_iterate_proc(NULL, block, block, &data);
1128 if (ret & BLOCK_ABORT) {
1133 if (data.num_blocks > 0) {
1134 ret = record_file_blocks(trans, root, objectid, inode,
1135 data.first_block, data.disk_block,
1136 data.num_blocks, 0);
1139 data.first_block += data.num_blocks;
1141 if (last_block > data.first_block) {
1142 ret = record_file_blocks(trans, root, objectid, inode,
1143 data.first_block, 0, last_block -
1144 data.first_block, 0);
1152 * Create the ext2fs image file.
1154 static int create_ext2_image(struct btrfs_root *root, ext2_filsys ext2_fs,
1158 struct btrfs_key key;
1159 struct btrfs_key location;
1160 struct btrfs_path path;
1161 struct btrfs_inode_item btrfs_inode;
1162 struct btrfs_inode_item *inode_item;
1163 struct extent_buffer *leaf;
1164 struct btrfs_fs_info *fs_info = root->fs_info;
1165 struct btrfs_root *extent_root = fs_info->extent_root;
1166 struct btrfs_trans_handle *trans;
1167 struct btrfs_extent_item *ei;
1168 struct btrfs_extent_inline_ref *iref;
1169 struct btrfs_extent_data_ref *dref;
1176 u32 sectorsize = root->sectorsize;
1178 total_bytes = btrfs_super_total_bytes(fs_info->super_copy);
1179 first_free = BTRFS_SUPER_INFO_OFFSET + sectorsize * 2 - 1;
1180 first_free &= ~((u64)sectorsize - 1);
1182 memset(&btrfs_inode, 0, sizeof(btrfs_inode));
1183 btrfs_set_stack_inode_generation(&btrfs_inode, 1);
1184 btrfs_set_stack_inode_size(&btrfs_inode, total_bytes);
1185 btrfs_set_stack_inode_nlink(&btrfs_inode, 1);
1186 btrfs_set_stack_inode_nbytes(&btrfs_inode, 0);
1187 btrfs_set_stack_inode_mode(&btrfs_inode, S_IFREG | 0400);
1188 btrfs_set_stack_inode_flags(&btrfs_inode, BTRFS_INODE_NODATASUM |
1189 BTRFS_INODE_READONLY);
1190 btrfs_init_path(&path);
1191 trans = btrfs_start_transaction(root, 1);
1194 objectid = btrfs_root_dirid(&root->root_item);
1195 ret = btrfs_find_free_objectid(trans, root, objectid, &objectid);
1200 * copy blocks covered by extent #0 to new positions. extent #0 is
1201 * special, we can't rely on relocate_extents_range to relocate it.
1203 for (last_byte = 0; last_byte < first_free; last_byte += sectorsize) {
1204 ret = custom_alloc_extent(root, sectorsize, 0, &key);
1207 ret = copy_disk_extent(root, key.objectid, last_byte,
1211 ret = btrfs_record_file_extent(trans, root, objectid,
1212 &btrfs_inode, last_byte,
1213 key.objectid, sectorsize);
1219 key.objectid = last_byte;
1221 btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY);
1222 ret = btrfs_search_slot(trans, fs_info->extent_root,
1227 leaf = path.nodes[0];
1228 if (path.slots[0] >= btrfs_header_nritems(leaf)) {
1229 ret = btrfs_next_leaf(extent_root, &path);
1234 leaf = path.nodes[0];
1236 btrfs_item_key_to_cpu(leaf, &key, path.slots[0]);
1237 if (last_byte > key.objectid ||
1238 key.type != BTRFS_EXTENT_ITEM_KEY) {
1243 bytenr = key.objectid;
1244 num_bytes = key.offset;
1245 ei = btrfs_item_ptr(leaf, path.slots[0],
1246 struct btrfs_extent_item);
1247 if (!(btrfs_extent_flags(leaf, ei) & BTRFS_EXTENT_FLAG_DATA)) {
1252 BUG_ON(btrfs_item_size_nr(leaf, path.slots[0]) != sizeof(*ei) +
1253 btrfs_extent_inline_ref_size(BTRFS_EXTENT_DATA_REF_KEY));
1255 iref = (struct btrfs_extent_inline_ref *)(ei + 1);
1256 key.type = btrfs_extent_inline_ref_type(leaf, iref);
1257 BUG_ON(key.type != BTRFS_EXTENT_DATA_REF_KEY);
1258 dref = (struct btrfs_extent_data_ref *)(&iref->offset);
1259 if (btrfs_extent_data_ref_root(leaf, dref) !=
1260 BTRFS_FS_TREE_OBJECTID) {
1265 if (bytenr > last_byte) {
1266 ret = create_image_file_range(trans, root, objectid,
1267 &btrfs_inode, last_byte,
1272 ret = btrfs_record_file_extent(trans, root, objectid,
1273 &btrfs_inode, bytenr, bytenr,
1277 last_byte = bytenr + num_bytes;
1278 btrfs_release_path(&path);
1280 if (trans->blocks_used >= 4096) {
1281 ret = btrfs_commit_transaction(trans, root);
1283 trans = btrfs_start_transaction(root, 1);
1287 btrfs_release_path(&path);
1288 if (total_bytes > last_byte) {
1289 ret = create_image_file_range(trans, root, objectid,
1290 &btrfs_inode, last_byte,
1291 total_bytes, ext2_fs);
1296 ret = btrfs_insert_inode(trans, root, objectid, &btrfs_inode);
1300 location.objectid = objectid;
1301 location.offset = 0;
1302 btrfs_set_key_type(&location, BTRFS_INODE_ITEM_KEY);
1303 ret = btrfs_insert_dir_item(trans, root, name, strlen(name),
1304 btrfs_root_dirid(&root->root_item),
1305 &location, EXT2_FT_REG_FILE, objectid);
1308 ret = btrfs_insert_inode_ref(trans, root, name, strlen(name),
1310 btrfs_root_dirid(&root->root_item),
1314 location.objectid = btrfs_root_dirid(&root->root_item);
1315 location.offset = 0;
1316 btrfs_set_key_type(&location, BTRFS_INODE_ITEM_KEY);
1317 ret = btrfs_lookup_inode(trans, root, &path, &location, 1);
1320 leaf = path.nodes[0];
1321 inode_item = btrfs_item_ptr(leaf, path.slots[0],
1322 struct btrfs_inode_item);
1323 btrfs_set_inode_size(leaf, inode_item, strlen(name) * 2 +
1324 btrfs_inode_size(leaf, inode_item));
1325 btrfs_mark_buffer_dirty(leaf);
1326 btrfs_release_path(&path);
1327 ret = btrfs_commit_transaction(trans, root);
1330 btrfs_release_path(&path);
1334 static struct btrfs_root * link_subvol(struct btrfs_root *root,
1335 const char *base, u64 root_objectid)
1337 struct btrfs_trans_handle *trans;
1338 struct btrfs_fs_info *fs_info = root->fs_info;
1339 struct btrfs_root *tree_root = fs_info->tree_root;
1340 struct btrfs_root *new_root = NULL;
1341 struct btrfs_path *path;
1342 struct btrfs_inode_item *inode_item;
1343 struct extent_buffer *leaf;
1344 struct btrfs_key key;
1345 u64 dirid = btrfs_root_dirid(&root->root_item);
1347 char buf[BTRFS_NAME_LEN + 1]; /* for snprintf null */
1353 if (len < 1 || len > BTRFS_NAME_LEN)
1356 path = btrfs_alloc_path();
1359 key.objectid = dirid;
1360 key.type = BTRFS_DIR_INDEX_KEY;
1361 key.offset = (u64)-1;
1363 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1366 if (path->slots[0] > 0) {
1368 btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
1369 if (key.objectid == dirid && key.type == BTRFS_DIR_INDEX_KEY)
1370 index = key.offset + 1;
1372 btrfs_release_path(path);
1374 trans = btrfs_start_transaction(root, 1);
1377 key.objectid = dirid;
1379 key.type = BTRFS_INODE_ITEM_KEY;
1381 ret = btrfs_lookup_inode(trans, root, path, &key, 1);
1383 leaf = path->nodes[0];
1384 inode_item = btrfs_item_ptr(leaf, path->slots[0],
1385 struct btrfs_inode_item);
1387 key.objectid = root_objectid;
1388 key.offset = (u64)-1;
1389 key.type = BTRFS_ROOT_ITEM_KEY;
1391 memcpy(buf, base, len);
1392 for (i = 0; i < 1024; i++) {
1393 ret = btrfs_insert_dir_item(trans, root, buf, len,
1394 dirid, &key, BTRFS_FT_DIR, index);
1397 len = snprintf(buf, ARRAY_SIZE(buf), "%s%d", base, i);
1398 if (len < 1 || len > BTRFS_NAME_LEN) {
1406 btrfs_set_inode_size(leaf, inode_item, len * 2 +
1407 btrfs_inode_size(leaf, inode_item));
1408 btrfs_mark_buffer_dirty(leaf);
1409 btrfs_release_path(path);
1411 /* add the backref first */
1412 ret = btrfs_add_root_ref(trans, tree_root, root_objectid,
1413 BTRFS_ROOT_BACKREF_KEY,
1414 root->root_key.objectid,
1415 dirid, index, buf, len);
1418 /* now add the forward ref */
1419 ret = btrfs_add_root_ref(trans, tree_root, root->root_key.objectid,
1420 BTRFS_ROOT_REF_KEY, root_objectid,
1421 dirid, index, buf, len);
1423 ret = btrfs_commit_transaction(trans, root);
1426 new_root = btrfs_read_fs_root(fs_info, &key);
1427 if (IS_ERR(new_root))
1430 btrfs_free_path(path);
1434 static int create_chunk_mapping(struct btrfs_trans_handle *trans,
1435 struct btrfs_root *root)
1437 struct btrfs_fs_info *info = root->fs_info;
1438 struct btrfs_root *chunk_root = info->chunk_root;
1439 struct btrfs_root *extent_root = info->extent_root;
1440 struct btrfs_device *device;
1441 struct btrfs_block_group_cache *cache;
1442 struct btrfs_dev_extent *extent;
1443 struct extent_buffer *leaf;
1444 struct btrfs_chunk chunk;
1445 struct btrfs_key key;
1446 struct btrfs_path path;
1452 btrfs_init_path(&path);
1454 total_bytes = btrfs_super_total_bytes(root->fs_info->super_copy);
1455 chunk_objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID;
1457 BUG_ON(list_empty(&info->fs_devices->devices));
1458 device = list_entry(info->fs_devices->devices.next,
1459 struct btrfs_device, dev_list);
1460 BUG_ON(device->devid != info->fs_devices->latest_devid);
1462 /* delete device extent created by make_btrfs */
1463 key.objectid = device->devid;
1465 key.type = BTRFS_DEV_EXTENT_KEY;
1466 ret = btrfs_search_slot(trans, device->dev_root, &key, &path, -1, 1);
1471 ret = btrfs_del_item(trans, device->dev_root, &path);
1474 btrfs_release_path(&path);
1476 /* delete chunk item created by make_btrfs */
1477 key.objectid = chunk_objectid;
1479 key.type = BTRFS_CHUNK_ITEM_KEY;
1480 ret = btrfs_search_slot(trans, chunk_root, &key, &path, -1, 1);
1485 ret = btrfs_del_item(trans, chunk_root, &path);
1488 btrfs_release_path(&path);
1490 /* for each block group, create device extent and chunk item */
1492 while (cur_start < total_bytes) {
1493 cache = btrfs_lookup_block_group(root->fs_info, cur_start);
1496 /* insert device extent */
1497 key.objectid = device->devid;
1498 key.offset = cache->key.objectid;
1499 key.type = BTRFS_DEV_EXTENT_KEY;
1500 ret = btrfs_insert_empty_item(trans, device->dev_root, &path,
1501 &key, sizeof(*extent));
1505 leaf = path.nodes[0];
1506 extent = btrfs_item_ptr(leaf, path.slots[0],
1507 struct btrfs_dev_extent);
1509 btrfs_set_dev_extent_chunk_tree(leaf, extent,
1510 chunk_root->root_key.objectid);
1511 btrfs_set_dev_extent_chunk_objectid(leaf, extent,
1513 btrfs_set_dev_extent_chunk_offset(leaf, extent,
1514 cache->key.objectid);
1515 btrfs_set_dev_extent_length(leaf, extent, cache->key.offset);
1516 write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid,
1517 (unsigned long)btrfs_dev_extent_chunk_tree_uuid(extent),
1519 btrfs_mark_buffer_dirty(leaf);
1520 btrfs_release_path(&path);
1522 /* insert chunk item */
1523 btrfs_set_stack_chunk_length(&chunk, cache->key.offset);
1524 btrfs_set_stack_chunk_owner(&chunk,
1525 extent_root->root_key.objectid);
1526 btrfs_set_stack_chunk_stripe_len(&chunk, STRIPE_LEN);
1527 btrfs_set_stack_chunk_type(&chunk, cache->flags);
1528 btrfs_set_stack_chunk_io_align(&chunk, device->io_align);
1529 btrfs_set_stack_chunk_io_width(&chunk, device->io_width);
1530 btrfs_set_stack_chunk_sector_size(&chunk, device->sector_size);
1531 btrfs_set_stack_chunk_num_stripes(&chunk, 1);
1532 btrfs_set_stack_chunk_sub_stripes(&chunk, 0);
1533 btrfs_set_stack_stripe_devid(&chunk.stripe, device->devid);
1534 btrfs_set_stack_stripe_offset(&chunk.stripe,
1535 cache->key.objectid);
1536 memcpy(&chunk.stripe.dev_uuid, device->uuid, BTRFS_UUID_SIZE);
1538 key.objectid = chunk_objectid;
1539 key.offset = cache->key.objectid;
1540 key.type = BTRFS_CHUNK_ITEM_KEY;
1542 ret = btrfs_insert_item(trans, chunk_root, &key, &chunk,
1543 btrfs_chunk_item_size(1));
1547 cur_start = cache->key.objectid + cache->key.offset;
1550 device->bytes_used = total_bytes;
1551 ret = btrfs_update_device(trans, device);
1553 btrfs_release_path(&path);
1557 static int create_subvol(struct btrfs_trans_handle *trans,
1558 struct btrfs_root *root, u64 root_objectid)
1560 struct extent_buffer *tmp;
1561 struct btrfs_root *new_root;
1562 struct btrfs_key key;
1563 struct btrfs_root_item root_item;
1566 ret = btrfs_copy_root(trans, root, root->node, &tmp,
1570 memcpy(&root_item, &root->root_item, sizeof(root_item));
1571 btrfs_set_root_bytenr(&root_item, tmp->start);
1572 btrfs_set_root_level(&root_item, btrfs_header_level(tmp));
1573 btrfs_set_root_generation(&root_item, trans->transid);
1574 free_extent_buffer(tmp);
1576 key.objectid = root_objectid;
1577 key.type = BTRFS_ROOT_ITEM_KEY;
1578 key.offset = trans->transid;
1579 ret = btrfs_insert_root(trans, root->fs_info->tree_root,
1582 key.offset = (u64)-1;
1583 new_root = btrfs_read_fs_root(root->fs_info, &key);
1584 BUG_ON(!new_root || IS_ERR(new_root));
1586 ret = btrfs_make_root_dir(trans, new_root, BTRFS_FIRST_FREE_OBJECTID);
1592 static int init_btrfs(struct btrfs_root *root)
1595 struct btrfs_key location;
1596 struct btrfs_trans_handle *trans;
1597 struct btrfs_fs_info *fs_info = root->fs_info;
1598 struct extent_buffer *tmp;
1600 trans = btrfs_start_transaction(root, 1);
1602 ret = btrfs_make_block_groups(trans, root);
1605 ret = btrfs_fix_block_accounting(trans, root);
1608 ret = create_chunk_mapping(trans, root);
1611 ret = btrfs_make_root_dir(trans, fs_info->tree_root,
1612 BTRFS_ROOT_TREE_DIR_OBJECTID);
1615 memcpy(&location, &root->root_key, sizeof(location));
1616 location.offset = (u64)-1;
1617 ret = btrfs_insert_dir_item(trans, fs_info->tree_root, "default", 7,
1618 btrfs_super_root_dir(fs_info->super_copy),
1619 &location, BTRFS_FT_DIR, 0);
1622 ret = btrfs_insert_inode_ref(trans, fs_info->tree_root, "default", 7,
1624 btrfs_super_root_dir(fs_info->super_copy), 0);
1627 btrfs_set_root_dirid(&fs_info->fs_root->root_item,
1628 BTRFS_FIRST_FREE_OBJECTID);
1630 /* subvol for ext2 image file */
1631 ret = create_subvol(trans, root, EXT2_IMAGE_SUBVOL_OBJECTID);
1633 /* subvol for data relocation */
1634 ret = create_subvol(trans, root, BTRFS_DATA_RELOC_TREE_OBJECTID);
1637 ret = __btrfs_cow_block(trans, fs_info->csum_root,
1638 fs_info->csum_root->node, NULL, 0, &tmp, 0, 0);
1640 free_extent_buffer(tmp);
1642 ret = btrfs_commit_transaction(trans, root);
1649 * Migrate super block to it's default position and zero 0 ~ 16k
1651 static int migrate_super_block(int fd, u64 old_bytenr, u32 sectorsize)
1654 struct extent_buffer *buf;
1655 struct btrfs_super_block *super;
1659 BUG_ON(sectorsize < sizeof(*super));
1660 buf = malloc(sizeof(*buf) + sectorsize);
1664 buf->len = sectorsize;
1665 ret = pread(fd, buf->data, sectorsize, old_bytenr);
1666 if (ret != sectorsize)
1669 super = (struct btrfs_super_block *)buf->data;
1670 BUG_ON(btrfs_super_bytenr(super) != old_bytenr);
1671 btrfs_set_super_bytenr(super, BTRFS_SUPER_INFO_OFFSET);
1673 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
1674 ret = pwrite(fd, buf->data, sectorsize, BTRFS_SUPER_INFO_OFFSET);
1675 if (ret != sectorsize)
1682 memset(buf->data, 0, sectorsize);
1683 for (bytenr = 0; bytenr < BTRFS_SUPER_INFO_OFFSET; ) {
1684 len = BTRFS_SUPER_INFO_OFFSET - bytenr;
1685 if (len > sectorsize)
1687 ret = pwrite(fd, buf->data, len, bytenr);
1689 fprintf(stderr, "unable to zero fill device\n");
1703 static int prepare_system_chunk_sb(struct btrfs_super_block *super)
1705 struct btrfs_chunk *chunk;
1706 struct btrfs_disk_key *key;
1707 u32 sectorsize = btrfs_super_sectorsize(super);
1709 key = (struct btrfs_disk_key *)(super->sys_chunk_array);
1710 chunk = (struct btrfs_chunk *)(super->sys_chunk_array +
1711 sizeof(struct btrfs_disk_key));
1713 btrfs_set_disk_key_objectid(key, BTRFS_FIRST_CHUNK_TREE_OBJECTID);
1714 btrfs_set_disk_key_type(key, BTRFS_CHUNK_ITEM_KEY);
1715 btrfs_set_disk_key_offset(key, 0);
1717 btrfs_set_stack_chunk_length(chunk, btrfs_super_total_bytes(super));
1718 btrfs_set_stack_chunk_owner(chunk, BTRFS_EXTENT_TREE_OBJECTID);
1719 btrfs_set_stack_chunk_stripe_len(chunk, 64 * 1024);
1720 btrfs_set_stack_chunk_type(chunk, BTRFS_BLOCK_GROUP_SYSTEM);
1721 btrfs_set_stack_chunk_io_align(chunk, sectorsize);
1722 btrfs_set_stack_chunk_io_width(chunk, sectorsize);
1723 btrfs_set_stack_chunk_sector_size(chunk, sectorsize);
1724 btrfs_set_stack_chunk_num_stripes(chunk, 1);
1725 btrfs_set_stack_chunk_sub_stripes(chunk, 0);
1726 chunk->stripe.devid = super->dev_item.devid;
1727 btrfs_set_stack_stripe_offset(&chunk->stripe, 0);
1728 memcpy(chunk->stripe.dev_uuid, super->dev_item.uuid, BTRFS_UUID_SIZE);
1729 btrfs_set_super_sys_array_size(super, sizeof(*key) + sizeof(*chunk));
1733 static int prepare_system_chunk(int fd, u64 sb_bytenr, u32 sectorsize)
1736 struct extent_buffer *buf;
1737 struct btrfs_super_block *super;
1739 BUG_ON(sectorsize < sizeof(*super));
1740 buf = malloc(sizeof(*buf) + sectorsize);
1744 buf->len = sectorsize;
1745 ret = pread(fd, buf->data, sectorsize, sb_bytenr);
1746 if (ret != sectorsize)
1749 super = (struct btrfs_super_block *)buf->data;
1750 BUG_ON(btrfs_super_bytenr(super) != sb_bytenr);
1751 BUG_ON(btrfs_super_num_devices(super) != 1);
1753 ret = prepare_system_chunk_sb(super);
1757 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
1758 ret = pwrite(fd, buf->data, sectorsize, sb_bytenr);
1759 if (ret != sectorsize)
1770 static int relocate_one_reference(struct btrfs_trans_handle *trans,
1771 struct btrfs_root *root,
1772 u64 extent_start, u64 extent_size,
1773 struct btrfs_key *extent_key,
1774 struct extent_io_tree *reloc_tree)
1776 struct extent_buffer *leaf;
1777 struct btrfs_file_extent_item *fi;
1778 struct btrfs_key key;
1779 struct btrfs_path path;
1780 struct btrfs_inode_item inode;
1781 struct blk_iterate_data data;
1788 u32 sectorsize = root->sectorsize;
1794 btrfs_init_path(&path);
1795 ret = btrfs_search_slot(trans, root, extent_key, &path, -1, 1);
1799 leaf = path.nodes[0];
1800 fi = btrfs_item_ptr(leaf, path.slots[0],
1801 struct btrfs_file_extent_item);
1802 BUG_ON(btrfs_file_extent_offset(leaf, fi) > 0);
1803 if (extent_start != btrfs_file_extent_disk_bytenr(leaf, fi) ||
1804 extent_size != btrfs_file_extent_disk_num_bytes(leaf, fi)) {
1809 bytenr = extent_start + btrfs_file_extent_offset(leaf, fi);
1810 num_bytes = btrfs_file_extent_num_bytes(leaf, fi);
1812 ret = btrfs_del_item(trans, root, &path);
1816 ret = btrfs_free_extent(trans, root, extent_start, extent_size, 0,
1817 root->root_key.objectid,
1818 extent_key->objectid, extent_key->offset);
1822 btrfs_release_path(&path);
1824 key.objectid = extent_key->objectid;
1826 key.type = BTRFS_INODE_ITEM_KEY;
1827 ret = btrfs_lookup_inode(trans, root, &path, &key, 0);
1831 leaf = path.nodes[0];
1832 ptr = btrfs_item_ptr_offset(leaf, path.slots[0]);
1833 read_extent_buffer(leaf, &inode, ptr, sizeof(inode));
1834 btrfs_release_path(&path);
1836 BUG_ON(num_bytes & (sectorsize - 1));
1837 nbytes = btrfs_stack_inode_nbytes(&inode) - num_bytes;
1838 btrfs_set_stack_inode_nbytes(&inode, nbytes);
1839 datacsum = !(btrfs_stack_inode_flags(&inode) & BTRFS_INODE_NODATASUM);
1841 data = (struct blk_iterate_data) {
1845 .objectid = extent_key->objectid,
1846 .first_block = extent_key->offset / sectorsize,
1849 .boundary = (u64)-1,
1850 .checksum = datacsum,
1854 cur_offset = extent_key->offset;
1855 while (num_bytes > 0) {
1856 sector_end = bytenr + sectorsize - 1;
1857 if (test_range_bit(reloc_tree, bytenr, sector_end,
1858 EXTENT_LOCKED, 1)) {
1859 ret = get_state_private(reloc_tree, bytenr, &new_pos);
1862 ret = custom_alloc_extent(root, sectorsize, 0, &key);
1865 new_pos = key.objectid;
1867 if (cur_offset == extent_key->offset) {
1868 fd = root->fs_info->fs_devices->latest_bdev;
1869 readahead(fd, bytenr, num_bytes);
1871 ret = copy_disk_extent(root, new_pos, bytenr,
1875 ret = set_extent_bits(reloc_tree, bytenr, sector_end,
1876 EXTENT_LOCKED, GFP_NOFS);
1878 ret = set_state_private(reloc_tree, bytenr, new_pos);
1882 ret = block_iterate_proc(NULL, new_pos / sectorsize,
1883 cur_offset / sectorsize, &data);
1884 if (ret & BLOCK_ABORT) {
1889 cur_offset += sectorsize;
1890 bytenr += sectorsize;
1891 num_bytes -= sectorsize;
1894 if (data.num_blocks > 0) {
1895 ret = record_file_blocks(trans, root,
1896 extent_key->objectid, &inode,
1897 data.first_block, data.disk_block,
1898 data.num_blocks, datacsum);
1903 key.objectid = extent_key->objectid;
1905 key.type = BTRFS_INODE_ITEM_KEY;
1906 ret = btrfs_lookup_inode(trans, root, &path, &key, 1);
1910 leaf = path.nodes[0];
1911 ptr = btrfs_item_ptr_offset(leaf, path.slots[0]);
1912 write_extent_buffer(leaf, &inode, ptr, sizeof(inode));
1913 btrfs_mark_buffer_dirty(leaf);
1914 btrfs_release_path(&path);
1917 btrfs_release_path(&path);
1921 static int relocate_extents_range(struct btrfs_root *fs_root,
1922 struct btrfs_root *ext2_root,
1923 u64 start_byte, u64 end_byte)
1925 struct btrfs_fs_info *info = fs_root->fs_info;
1926 struct btrfs_root *extent_root = info->extent_root;
1927 struct btrfs_root *cur_root = NULL;
1928 struct btrfs_trans_handle *trans;
1929 struct btrfs_extent_data_ref *dref;
1930 struct btrfs_extent_inline_ref *iref;
1931 struct btrfs_extent_item *ei;
1932 struct extent_buffer *leaf;
1933 struct btrfs_key key;
1934 struct btrfs_key extent_key;
1935 struct btrfs_path path;
1936 struct extent_io_tree reloc_tree;
1946 btrfs_init_path(&path);
1947 extent_io_tree_init(&reloc_tree);
1949 key.objectid = start_byte;
1951 key.type = BTRFS_EXTENT_ITEM_KEY;
1952 ret = btrfs_search_slot(NULL, extent_root, &key, &path, 0, 0);
1956 ret = btrfs_previous_item(extent_root, &path, 0,
1957 BTRFS_EXTENT_ITEM_KEY);
1961 leaf = path.nodes[0];
1962 btrfs_item_key_to_cpu(leaf, &key, path.slots[0]);
1963 if (key.objectid + key.offset > start_byte)
1964 start_byte = key.objectid;
1967 btrfs_release_path(&path);
1969 cur_root = (pass % 2 == 0) ? ext2_root : fs_root;
1972 trans = btrfs_start_transaction(cur_root, 1);
1975 cur_byte = start_byte;
1977 key.objectid = cur_byte;
1979 key.type = BTRFS_EXTENT_ITEM_KEY;
1980 ret = btrfs_search_slot(trans, extent_root,
1985 leaf = path.nodes[0];
1986 if (path.slots[0] >= btrfs_header_nritems(leaf)) {
1987 ret = btrfs_next_leaf(extent_root, &path);
1992 leaf = path.nodes[0];
1995 btrfs_item_key_to_cpu(leaf, &key, path.slots[0]);
1996 if (key.objectid < cur_byte ||
1997 key.type != BTRFS_EXTENT_ITEM_KEY) {
2001 if (key.objectid >= end_byte)
2006 cur_byte = key.objectid;
2007 num_bytes = key.offset;
2008 ei = btrfs_item_ptr(leaf, path.slots[0],
2009 struct btrfs_extent_item);
2010 BUG_ON(!(btrfs_extent_flags(leaf, ei) &
2011 BTRFS_EXTENT_FLAG_DATA));
2013 ptr = btrfs_item_ptr_offset(leaf, path.slots[0]);
2014 end = ptr + btrfs_item_size_nr(leaf, path.slots[0]);
2016 ptr += sizeof(struct btrfs_extent_item);
2019 iref = (struct btrfs_extent_inline_ref *)ptr;
2020 key.type = btrfs_extent_inline_ref_type(leaf, iref);
2021 BUG_ON(key.type != BTRFS_EXTENT_DATA_REF_KEY);
2022 dref = (struct btrfs_extent_data_ref *)(&iref->offset);
2023 ref_root = btrfs_extent_data_ref_root(leaf, dref);
2024 extent_key.objectid =
2025 btrfs_extent_data_ref_objectid(leaf, dref);
2027 btrfs_extent_data_ref_offset(leaf, dref);
2028 extent_key.type = BTRFS_EXTENT_DATA_KEY;
2029 BUG_ON(btrfs_extent_data_ref_count(leaf, dref) != 1);
2031 if (ref_root == cur_root->root_key.objectid)
2034 ptr += btrfs_extent_inline_ref_size(key.type);
2042 ret = relocate_one_reference(trans, cur_root, cur_byte,
2043 num_bytes, &extent_key,
2048 cur_byte += num_bytes;
2049 btrfs_release_path(&path);
2051 if (trans->blocks_used >= 4096) {
2052 ret = btrfs_commit_transaction(trans, cur_root);
2054 trans = btrfs_start_transaction(cur_root, 1);
2058 btrfs_release_path(&path);
2060 ret = btrfs_commit_transaction(trans, cur_root);
2063 if (num_extents > 0 && pass++ < 16)
2066 ret = (num_extents > 0) ? -1 : 0;
2068 btrfs_release_path(&path);
2069 extent_io_tree_cleanup(&reloc_tree);
2074 * relocate data in system chunk
2076 static int cleanup_sys_chunk(struct btrfs_root *fs_root,
2077 struct btrfs_root *ext2_root)
2079 struct btrfs_block_group_cache *cache;
2085 cache = btrfs_lookup_block_group(fs_root->fs_info, offset);
2089 end_byte = cache->key.objectid + cache->key.offset;
2090 if (cache->flags & BTRFS_BLOCK_GROUP_SYSTEM) {
2091 ret = relocate_extents_range(fs_root, ext2_root,
2092 cache->key.objectid,
2099 for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
2100 offset = btrfs_sb_offset(i);
2101 offset &= ~((u64)STRIPE_LEN - 1);
2103 ret = relocate_extents_range(fs_root, ext2_root,
2104 offset, offset + STRIPE_LEN);
2113 static int fixup_chunk_mapping(struct btrfs_root *root)
2115 struct btrfs_trans_handle *trans;
2116 struct btrfs_fs_info *info = root->fs_info;
2117 struct btrfs_root *chunk_root = info->chunk_root;
2118 struct extent_buffer *leaf;
2119 struct btrfs_key key;
2120 struct btrfs_path path;
2121 struct btrfs_chunk chunk;
2127 btrfs_init_path(&path);
2129 trans = btrfs_start_transaction(root, 1);
2133 * recow the whole chunk tree. this will move all chunk tree blocks
2134 * into system block group.
2136 memset(&key, 0, sizeof(key));
2138 ret = btrfs_search_slot(trans, chunk_root, &key, &path, 0, 1);
2142 ret = btrfs_next_leaf(chunk_root, &path);
2148 btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]);
2149 btrfs_release_path(&path);
2151 btrfs_release_path(&path);
2153 /* fixup the system chunk array in super block */
2154 btrfs_set_super_sys_array_size(info->super_copy, 0);
2156 key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID;
2158 key.type = BTRFS_CHUNK_ITEM_KEY;
2160 ret = btrfs_search_slot(trans, chunk_root, &key, &path, 0, 0);
2165 leaf = path.nodes[0];
2166 if (path.slots[0] >= btrfs_header_nritems(leaf)) {
2167 ret = btrfs_next_leaf(chunk_root, &path);
2172 leaf = path.nodes[0];
2174 btrfs_item_key_to_cpu(leaf, &key, path.slots[0]);
2175 if (key.type != BTRFS_CHUNK_ITEM_KEY)
2178 ptr = btrfs_item_ptr_offset(leaf, path.slots[0]);
2179 size = btrfs_item_size_nr(leaf, path.slots[0]);
2180 BUG_ON(size != sizeof(chunk));
2181 read_extent_buffer(leaf, &chunk, ptr, size);
2182 type = btrfs_stack_chunk_type(&chunk);
2184 if (!(type & BTRFS_BLOCK_GROUP_SYSTEM))
2187 ret = btrfs_add_system_chunk(trans, chunk_root, &key,
2195 ret = btrfs_commit_transaction(trans, root);
2198 btrfs_release_path(&path);
2202 static int do_convert(const char *devname, int datacsum, int packing,
2211 ext2_filsys ext2_fs;
2212 struct btrfs_root *root;
2213 struct btrfs_root *ext2_root;
2215 ret = open_ext2fs(devname, &ext2_fs);
2217 fprintf(stderr, "unable to open the Ext2fs\n");
2220 blocksize = ext2_fs->blocksize;
2221 total_bytes = (u64)ext2_fs->super->s_blocks_count * blocksize;
2222 if (blocksize < 4096) {
2223 fprintf(stderr, "block size is too small\n");
2226 if (!(ext2_fs->super->s_feature_incompat &
2227 EXT2_FEATURE_INCOMPAT_FILETYPE)) {
2228 fprintf(stderr, "filetype feature is missing\n");
2231 for (i = 0; i < 7; i++) {
2232 ret = ext2_alloc_block(ext2_fs, 0, blocks + i);
2234 fprintf(stderr, "not enough free space\n");
2237 blocks[i] *= blocksize;
2239 super_bytenr = blocks[0];
2240 fd = open(devname, O_RDWR);
2242 fprintf(stderr, "unable to open %s\n", devname);
2245 ret = make_btrfs(fd, devname, ext2_fs->super->s_volume_name,
2246 blocks, total_bytes, blocksize, blocksize,
2247 blocksize, blocksize, 0);
2249 fprintf(stderr, "unable to create initial ctree: %s\n",
2253 /* create a system chunk that maps the whole device */
2254 ret = prepare_system_chunk(fd, super_bytenr, blocksize);
2256 fprintf(stderr, "unable to update system chunk\n");
2259 root = open_ctree_fd(fd, devname, super_bytenr, O_RDWR);
2261 fprintf(stderr, "unable to open ctree\n");
2264 ret = cache_free_extents(root, ext2_fs);
2266 fprintf(stderr, "error during cache_free_extents %d\n", ret);
2269 root->fs_info->extent_ops = &extent_ops;
2270 /* recover block allocation bitmap */
2271 for (i = 0; i < 7; i++) {
2272 blocks[i] /= blocksize;
2273 ext2_free_block(ext2_fs, blocks[i]);
2275 ret = init_btrfs(root);
2277 fprintf(stderr, "unable to setup the root tree\n");
2280 printf("creating btrfs metadata.\n");
2281 ret = copy_inodes(root, ext2_fs, datacsum, packing, noxattr);
2283 fprintf(stderr, "error during copy_inodes %d\n", ret);
2286 printf("creating ext2fs image file.\n");
2287 ext2_root = link_subvol(root, "ext2_saved", EXT2_IMAGE_SUBVOL_OBJECTID);
2289 fprintf(stderr, "unable to create subvol\n");
2292 ret = create_ext2_image(ext2_root, ext2_fs, "image");
2294 fprintf(stderr, "error during create_ext2_image %d\n", ret);
2297 printf("cleaning up system chunk.\n");
2298 ret = cleanup_sys_chunk(root, ext2_root);
2300 fprintf(stderr, "error during cleanup_sys_chunk %d\n", ret);
2303 ret = close_ctree(root);
2305 fprintf(stderr, "error during close_ctree %d\n", ret);
2308 close_ext2fs(ext2_fs);
2311 * If this step succeed, we get a mountable btrfs. Otherwise
2312 * the ext2fs is left unchanged.
2314 ret = migrate_super_block(fd, super_bytenr, blocksize);
2316 fprintf(stderr, "unable to migrate super block\n");
2320 root = open_ctree_fd(fd, devname, 0, O_RDWR);
2322 fprintf(stderr, "unable to open ctree\n");
2325 /* move chunk tree into system chunk. */
2326 ret = fixup_chunk_mapping(root);
2328 fprintf(stderr, "error during fixup_chunk_tree\n");
2331 ret = close_ctree(root);
2334 printf("conversion complete.\n");
2339 fprintf(stderr, "conversion aborted.\n");
2343 static int may_rollback(struct btrfs_root *root)
2345 struct btrfs_fs_info *info = root->fs_info;
2346 struct btrfs_multi_bio *multi = NULL;
2354 if (btrfs_super_num_devices(info->super_copy) != 1)
2357 bytenr = BTRFS_SUPER_INFO_OFFSET;
2358 total_bytes = btrfs_super_total_bytes(root->fs_info->super_copy);
2361 ret = btrfs_map_block(&info->mapping_tree, WRITE, bytenr,
2362 &length, &multi, 0, NULL);
2366 num_stripes = multi->num_stripes;
2367 physical = multi->stripes[0].physical;
2370 if (num_stripes != 1 || physical != bytenr)
2374 if (bytenr >= total_bytes)
2382 static int do_rollback(const char *devname, int force)
2387 struct btrfs_root *root;
2388 struct btrfs_root *ext2_root;
2389 struct btrfs_root *chunk_root;
2390 struct btrfs_dir_item *dir;
2391 struct btrfs_inode_item *inode;
2392 struct btrfs_file_extent_item *fi;
2393 struct btrfs_trans_handle *trans;
2394 struct extent_buffer *leaf;
2395 struct btrfs_block_group_cache *cache1;
2396 struct btrfs_block_group_cache *cache2;
2397 struct btrfs_key key;
2398 struct btrfs_path path;
2399 struct extent_io_tree io_tree;
2414 extent_io_tree_init(&io_tree);
2416 fd = open(devname, O_RDWR);
2418 fprintf(stderr, "unable to open %s\n", devname);
2421 root = open_ctree_fd(fd, devname, 0, O_RDWR);
2423 fprintf(stderr, "unable to open ctree\n");
2426 ret = may_rollback(root);
2428 fprintf(stderr, "unable to do rollback\n");
2432 sectorsize = root->sectorsize;
2433 buf = malloc(sectorsize);
2435 fprintf(stderr, "unable to allocate memory\n");
2439 btrfs_init_path(&path);
2441 key.objectid = EXT2_IMAGE_SUBVOL_OBJECTID;
2442 key.type = BTRFS_ROOT_ITEM_KEY;
2443 key.offset = (u64)-1;
2444 ext2_root = btrfs_read_fs_root(root->fs_info, &key);
2445 if (!ext2_root || IS_ERR(ext2_root)) {
2446 fprintf(stderr, "unable to open subvol %llu\n",
2452 root_dir = btrfs_root_dirid(&root->root_item);
2453 dir = btrfs_lookup_dir_item(NULL, ext2_root, &path,
2454 root_dir, name, strlen(name), 0);
2455 if (!dir || IS_ERR(dir)) {
2456 fprintf(stderr, "unable to find file %s\n", name);
2459 leaf = path.nodes[0];
2460 btrfs_dir_item_key_to_cpu(leaf, dir, &key);
2461 btrfs_release_path(&path);
2463 objectid = key.objectid;
2465 ret = btrfs_lookup_inode(NULL, ext2_root, &path, &key, 0);
2467 fprintf(stderr, "unable to find inode item\n");
2470 leaf = path.nodes[0];
2471 inode = btrfs_item_ptr(leaf, path.slots[0], struct btrfs_inode_item);
2472 total_bytes = btrfs_inode_size(leaf, inode);
2473 btrfs_release_path(&path);
2475 key.objectid = objectid;
2477 btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY);
2478 ret = btrfs_search_slot(NULL, ext2_root, &key, &path, 0, 0);
2480 fprintf(stderr, "unable to find first file extent\n");
2481 btrfs_release_path(&path);
2485 /* build mapping tree for the relocated blocks */
2486 for (offset = 0; offset < total_bytes; ) {
2487 leaf = path.nodes[0];
2488 if (path.slots[0] >= btrfs_header_nritems(leaf)) {
2489 ret = btrfs_next_leaf(root, &path);
2495 btrfs_item_key_to_cpu(leaf, &key, path.slots[0]);
2496 if (key.objectid != objectid || key.offset != offset ||
2497 btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY)
2500 fi = btrfs_item_ptr(leaf, path.slots[0],
2501 struct btrfs_file_extent_item);
2502 if (btrfs_file_extent_type(leaf, fi) != BTRFS_FILE_EXTENT_REG)
2504 if (btrfs_file_extent_compression(leaf, fi) ||
2505 btrfs_file_extent_encryption(leaf, fi) ||
2506 btrfs_file_extent_other_encoding(leaf, fi))
2509 bytenr = btrfs_file_extent_disk_bytenr(leaf, fi);
2510 /* skip holes and direct mapped extents */
2511 if (bytenr == 0 || bytenr == offset)
2514 bytenr += btrfs_file_extent_offset(leaf, fi);
2515 num_bytes = btrfs_file_extent_num_bytes(leaf, fi);
2517 cache1 = btrfs_lookup_block_group(root->fs_info, offset);
2518 cache2 = btrfs_lookup_block_group(root->fs_info,
2519 offset + num_bytes - 1);
2520 if (!cache1 || cache1 != cache2 ||
2521 (!(cache1->flags & BTRFS_BLOCK_GROUP_SYSTEM) &&
2522 !intersect_with_sb(offset, num_bytes)))
2525 set_extent_bits(&io_tree, offset, offset + num_bytes - 1,
2526 EXTENT_LOCKED, GFP_NOFS);
2527 set_state_private(&io_tree, offset, bytenr);
2529 offset += btrfs_file_extent_num_bytes(leaf, fi);
2532 btrfs_release_path(&path);
2534 if (offset < total_bytes) {
2535 fprintf(stderr, "unable to build extent mapping\n");
2539 first_free = BTRFS_SUPER_INFO_OFFSET + 2 * sectorsize - 1;
2540 first_free &= ~((u64)sectorsize - 1);
2541 /* backup for extent #0 should exist */
2542 if(!test_range_bit(&io_tree, 0, first_free - 1, EXTENT_LOCKED, 1)) {
2543 fprintf(stderr, "no backup for the first extent\n");
2546 /* force no allocation from system block group */
2547 root->fs_info->system_allocs = -1;
2548 trans = btrfs_start_transaction(root, 1);
2551 * recow the whole chunk tree, this will remove all chunk tree blocks
2552 * from system block group
2554 chunk_root = root->fs_info->chunk_root;
2555 memset(&key, 0, sizeof(key));
2557 ret = btrfs_search_slot(trans, chunk_root, &key, &path, 0, 1);
2561 ret = btrfs_next_leaf(chunk_root, &path);
2565 btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]);
2566 btrfs_release_path(&path);
2568 btrfs_release_path(&path);
2573 cache1 = btrfs_lookup_block_group(root->fs_info, offset);
2577 if (cache1->flags & BTRFS_BLOCK_GROUP_SYSTEM)
2578 num_bytes += btrfs_block_group_used(&cache1->item);
2580 offset = cache1->key.objectid + cache1->key.offset;
2582 /* only extent #0 left in system block group? */
2583 if (num_bytes > first_free) {
2584 fprintf(stderr, "unable to empty system block group\n");
2587 /* create a system chunk that maps the whole device */
2588 ret = prepare_system_chunk_sb(root->fs_info->super_copy);
2590 fprintf(stderr, "unable to update system chunk\n");
2594 ret = btrfs_commit_transaction(trans, root);
2597 ret = close_ctree(root);
2599 fprintf(stderr, "error during close_ctree %d\n", ret);
2603 /* zero btrfs super block mirrors */
2604 memset(buf, 0, sectorsize);
2605 for (i = 1 ; i < BTRFS_SUPER_MIRROR_MAX; i++) {
2606 bytenr = btrfs_sb_offset(i);
2607 if (bytenr >= total_bytes)
2609 ret = pwrite(fd, buf, sectorsize, bytenr);
2612 sb_bytenr = (u64)-1;
2613 /* copy all relocated blocks back */
2615 ret = find_first_extent_bit(&io_tree, 0, &start, &end,
2620 ret = get_state_private(&io_tree, start, &bytenr);
2623 clear_extent_bits(&io_tree, start, end, EXTENT_LOCKED,
2626 while (start <= end) {
2627 if (start == BTRFS_SUPER_INFO_OFFSET) {
2631 ret = pread(fd, buf, sectorsize, bytenr);
2633 fprintf(stderr, "error during pread %d\n", ret);
2636 BUG_ON(ret != sectorsize);
2637 ret = pwrite(fd, buf, sectorsize, start);
2639 fprintf(stderr, "error during pwrite %d\n", ret);
2642 BUG_ON(ret != sectorsize);
2644 start += sectorsize;
2645 bytenr += sectorsize;
2651 fprintf(stderr, "error during fsync %d\n", ret);
2655 * finally, overwrite btrfs super block.
2657 ret = pread(fd, buf, sectorsize, sb_bytenr);
2659 fprintf(stderr, "error during pread %d\n", ret);
2662 BUG_ON(ret != sectorsize);
2663 ret = pwrite(fd, buf, sectorsize, BTRFS_SUPER_INFO_OFFSET);
2665 fprintf(stderr, "error during pwrite %d\n", ret);
2668 BUG_ON(ret != sectorsize);
2671 fprintf(stderr, "error during fsync %d\n", ret);
2677 extent_io_tree_cleanup(&io_tree);
2678 printf("rollback complete.\n");
2685 fprintf(stderr, "rollback aborted.\n");
2689 static void print_usage(void)
2691 printf("usage: btrfs-convert [-d] [-i] [-n] [-r] device\n");
2692 printf("\t-d disable data checksum\n");
2693 printf("\t-i ignore xattrs and ACLs\n");
2694 printf("\t-n disable packing of small files\n");
2695 printf("\t-r roll back to ext2fs\n");
2698 int main(int argc, char *argv[])
2707 int c = getopt(argc, argv, "dinr");
2728 argc = argc - optind;
2734 file = argv[optind];
2735 if (check_mounted(file)) {
2736 fprintf(stderr, "%s is mounted\n", file);
2741 ret = do_rollback(file, 0);
2743 ret = do_convert(file, datacsum, packing, noxattr);