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);
553 fprintf(stderr, "ext2fs_block_iterate2: %s\n", error_message(err));
557 static int create_symbol_link(struct btrfs_trans_handle *trans,
558 struct btrfs_root *root, u64 objectid,
559 struct btrfs_inode_item *btrfs_inode,
560 ext2_filsys ext2_fs, ext2_ino_t ext2_ino,
561 struct ext2_inode *ext2_inode)
565 u64 inode_size = btrfs_stack_inode_size(btrfs_inode);
566 if (ext2fs_inode_data_blocks(ext2_fs, ext2_inode)) {
567 btrfs_set_stack_inode_size(btrfs_inode, inode_size + 1);
568 ret = create_file_extents(trans, root, objectid, btrfs_inode,
569 ext2_fs, ext2_ino, 1, 1);
570 btrfs_set_stack_inode_size(btrfs_inode, inode_size);
574 pathname = (char *)&(ext2_inode->i_block[0]);
575 BUG_ON(pathname[inode_size] != 0);
576 ret = btrfs_insert_inline_extent(trans, root, objectid, 0,
577 pathname, inode_size + 1);
578 btrfs_set_stack_inode_nbytes(btrfs_inode, inode_size + 1);
583 * Following xattr/acl related codes are based on codes in
584 * fs/ext3/xattr.c and fs/ext3/acl.c
586 #define EXT2_XATTR_BHDR(ptr) ((struct ext2_ext_attr_header *)(ptr))
587 #define EXT2_XATTR_BFIRST(ptr) \
588 ((struct ext2_ext_attr_entry *)(EXT2_XATTR_BHDR(ptr) + 1))
589 #define EXT2_XATTR_IHDR(inode) \
590 ((struct ext2_ext_attr_header *) ((void *)(inode) + \
591 EXT2_GOOD_OLD_INODE_SIZE + (inode)->i_extra_isize))
592 #define EXT2_XATTR_IFIRST(inode) \
593 ((struct ext2_ext_attr_entry *) ((void *)EXT2_XATTR_IHDR(inode) + \
594 sizeof(EXT2_XATTR_IHDR(inode)->h_magic)))
596 static int ext2_xattr_check_names(struct ext2_ext_attr_entry *entry,
599 struct ext2_ext_attr_entry *next;
601 while (!EXT2_EXT_IS_LAST_ENTRY(entry)) {
602 next = EXT2_EXT_ATTR_NEXT(entry);
603 if ((void *)next >= end)
610 static int ext2_xattr_check_block(const char *buf, size_t size)
613 struct ext2_ext_attr_header *header = EXT2_XATTR_BHDR(buf);
615 if (header->h_magic != EXT2_EXT_ATTR_MAGIC ||
616 header->h_blocks != 1)
618 error = ext2_xattr_check_names(EXT2_XATTR_BFIRST(buf), buf + size);
622 static int ext2_xattr_check_entry(struct ext2_ext_attr_entry *entry,
625 size_t value_size = entry->e_value_size;
627 if (entry->e_value_block != 0 || value_size > size ||
628 entry->e_value_offs + value_size > size)
633 #define EXT2_ACL_VERSION 0x0001
644 } ext2_acl_entry_short;
650 static inline int ext2_acl_count(size_t size)
653 size -= sizeof(ext2_acl_header);
654 s = size - 4 * sizeof(ext2_acl_entry_short);
656 if (size % sizeof(ext2_acl_entry_short))
658 return size / sizeof(ext2_acl_entry_short);
660 if (s % sizeof(ext2_acl_entry))
662 return s / sizeof(ext2_acl_entry) + 4;
666 #define ACL_EA_VERSION 0x0002
676 acl_ea_entry a_entries[0];
679 static inline size_t acl_ea_size(int count)
681 return sizeof(acl_ea_header) + count * sizeof(acl_ea_entry);
684 static int ext2_acl_to_xattr(void *dst, const void *src,
685 size_t dst_size, size_t src_size)
688 const void *end = src + src_size;
689 acl_ea_header *ext_acl = (acl_ea_header *)dst;
690 acl_ea_entry *dst_entry = ext_acl->a_entries;
691 ext2_acl_entry *src_entry;
693 if (src_size < sizeof(ext2_acl_header))
695 if (((ext2_acl_header *)src)->a_version !=
696 cpu_to_le32(EXT2_ACL_VERSION))
698 src += sizeof(ext2_acl_header);
699 count = ext2_acl_count(src_size);
703 BUG_ON(dst_size < acl_ea_size(count));
704 ext_acl->a_version = cpu_to_le32(ACL_EA_VERSION);
705 for (i = 0; i < count; i++, dst_entry++) {
706 src_entry = (ext2_acl_entry *)src;
707 if (src + sizeof(ext2_acl_entry_short) > end)
709 dst_entry->e_tag = src_entry->e_tag;
710 dst_entry->e_perm = src_entry->e_perm;
711 switch (le16_to_cpu(src_entry->e_tag)) {
716 src += sizeof(ext2_acl_entry_short);
717 dst_entry->e_id = cpu_to_le32(ACL_UNDEFINED_ID);
721 src += sizeof(ext2_acl_entry);
724 dst_entry->e_id = src_entry->e_id;
737 static char *xattr_prefix_table[] = {
739 [2] = "system.posix_acl_access",
740 [3] = "system.posix_acl_default",
745 static int copy_single_xattr(struct btrfs_trans_handle *trans,
746 struct btrfs_root *root, u64 objectid,
747 struct ext2_ext_attr_entry *entry,
748 const void *data, u32 datalen)
753 void *databuf = NULL;
754 char namebuf[XATTR_NAME_MAX + 1];
756 name_index = entry->e_name_index;
757 if (name_index >= ARRAY_SIZE(xattr_prefix_table) ||
758 xattr_prefix_table[name_index] == NULL)
760 name_len = strlen(xattr_prefix_table[name_index]) +
762 if (name_len >= sizeof(namebuf))
765 if (name_index == 2 || name_index == 3) {
766 size_t bufsize = acl_ea_size(ext2_acl_count(datalen));
767 databuf = malloc(bufsize);
770 ret = ext2_acl_to_xattr(databuf, data, bufsize, datalen);
776 strncpy(namebuf, xattr_prefix_table[name_index], XATTR_NAME_MAX);
777 strncat(namebuf, EXT2_EXT_ATTR_NAME(entry), entry->e_name_len);
778 if (name_len + datalen > BTRFS_LEAF_DATA_SIZE(root) -
779 sizeof(struct btrfs_item) - sizeof(struct btrfs_dir_item)) {
780 fprintf(stderr, "skip large xattr on inode %Lu name %.*s\n",
781 objectid - INO_OFFSET, name_len, namebuf);
784 ret = btrfs_insert_xattr_item(trans, root, namebuf, name_len,
785 data, datalen, objectid);
791 static int copy_extended_attrs(struct btrfs_trans_handle *trans,
792 struct btrfs_root *root, u64 objectid,
793 struct btrfs_inode_item *btrfs_inode,
794 ext2_filsys ext2_fs, ext2_ino_t ext2_ino)
800 u32 block_size = ext2_fs->blocksize;
801 u32 inode_size = EXT2_INODE_SIZE(ext2_fs->super);
802 struct ext2_inode_large *ext2_inode;
803 struct ext2_ext_attr_entry *entry;
806 char inode_buf[EXT2_GOOD_OLD_INODE_SIZE];
808 if (inode_size <= EXT2_GOOD_OLD_INODE_SIZE) {
809 ext2_inode = (struct ext2_inode_large *)inode_buf;
811 ext2_inode = (struct ext2_inode_large *)malloc(inode_size);
815 err = ext2fs_read_inode_full(ext2_fs, ext2_ino, (void *)ext2_inode,
818 fprintf(stderr, "ext2fs_read_inode_full: %s\n",
824 if (ext2_ino > ext2_fs->super->s_first_ino &&
825 inode_size > EXT2_GOOD_OLD_INODE_SIZE) {
826 if (EXT2_GOOD_OLD_INODE_SIZE +
827 ext2_inode->i_extra_isize > inode_size) {
831 if (ext2_inode->i_extra_isize != 0 &&
832 EXT2_XATTR_IHDR(ext2_inode)->h_magic ==
833 EXT2_EXT_ATTR_MAGIC) {
839 void *end = (void *)ext2_inode + inode_size;
840 entry = EXT2_XATTR_IFIRST(ext2_inode);
841 total = end - (void *)entry;
842 ret = ext2_xattr_check_names(entry, end);
845 while (!EXT2_EXT_IS_LAST_ENTRY(entry)) {
846 ret = ext2_xattr_check_entry(entry, total);
849 data = (void *)EXT2_XATTR_IFIRST(ext2_inode) +
851 datalen = entry->e_value_size;
852 ret = copy_single_xattr(trans, root, objectid,
853 entry, data, datalen);
856 entry = EXT2_EXT_ATTR_NEXT(entry);
860 if (ext2_inode->i_file_acl == 0)
863 buffer = malloc(block_size);
868 err = ext2fs_read_ext_attr(ext2_fs, ext2_inode->i_file_acl, buffer);
870 fprintf(stderr, "ext2fs_read_ext_attr: %s\n",
875 ret = ext2_xattr_check_block(buffer, block_size);
879 entry = EXT2_XATTR_BFIRST(buffer);
880 while (!EXT2_EXT_IS_LAST_ENTRY(entry)) {
881 ret = ext2_xattr_check_entry(entry, block_size);
884 data = buffer + entry->e_value_offs;
885 datalen = entry->e_value_size;
886 ret = copy_single_xattr(trans, root, objectid,
887 entry, data, datalen);
890 entry = EXT2_EXT_ATTR_NEXT(entry);
894 if ((void *)ext2_inode != inode_buf)
899 #define MKDEV(ma, mi) (((ma) << MINORBITS) | (mi))
901 static inline dev_t old_decode_dev(u16 val)
903 return MKDEV((val >> 8) & 255, val & 255);
906 static inline dev_t new_decode_dev(u32 dev)
908 unsigned major = (dev & 0xfff00) >> 8;
909 unsigned minor = (dev & 0xff) | ((dev >> 12) & 0xfff00);
910 return MKDEV(major, minor);
913 static int copy_inode_item(struct btrfs_inode_item *dst,
914 struct ext2_inode *src, u32 blocksize)
916 btrfs_set_stack_inode_generation(dst, 1);
917 btrfs_set_stack_inode_size(dst, src->i_size);
918 btrfs_set_stack_inode_nbytes(dst, 0);
919 btrfs_set_stack_inode_block_group(dst, 0);
920 btrfs_set_stack_inode_nlink(dst, src->i_links_count);
921 btrfs_set_stack_inode_uid(dst, src->i_uid | (src->i_uid_high << 16));
922 btrfs_set_stack_inode_gid(dst, src->i_gid | (src->i_gid_high << 16));
923 btrfs_set_stack_inode_mode(dst, src->i_mode);
924 btrfs_set_stack_inode_rdev(dst, 0);
925 btrfs_set_stack_inode_flags(dst, 0);
926 btrfs_set_stack_timespec_sec(&dst->atime, src->i_atime);
927 btrfs_set_stack_timespec_nsec(&dst->atime, 0);
928 btrfs_set_stack_timespec_sec(&dst->ctime, src->i_ctime);
929 btrfs_set_stack_timespec_nsec(&dst->ctime, 0);
930 btrfs_set_stack_timespec_sec(&dst->mtime, src->i_mtime);
931 btrfs_set_stack_timespec_nsec(&dst->mtime, 0);
932 btrfs_set_stack_timespec_sec(&dst->otime, 0);
933 btrfs_set_stack_timespec_nsec(&dst->otime, 0);
935 if (S_ISDIR(src->i_mode)) {
936 btrfs_set_stack_inode_size(dst, 0);
937 btrfs_set_stack_inode_nlink(dst, 1);
939 if (S_ISREG(src->i_mode)) {
940 btrfs_set_stack_inode_size(dst, (u64)src->i_size_high << 32 |
943 if (!S_ISREG(src->i_mode) && !S_ISDIR(src->i_mode) &&
944 !S_ISLNK(src->i_mode)) {
945 if (src->i_block[0]) {
946 btrfs_set_stack_inode_rdev(dst,
947 old_decode_dev(src->i_block[0]));
949 btrfs_set_stack_inode_rdev(dst,
950 new_decode_dev(src->i_block[1]));
957 * copy a single inode. do all the required works, such as cloning
958 * inode item, creating file extents and creating directory entries.
960 static int copy_single_inode(struct btrfs_trans_handle *trans,
961 struct btrfs_root *root, u64 objectid,
962 ext2_filsys ext2_fs, ext2_ino_t ext2_ino,
963 struct ext2_inode *ext2_inode,
964 int datacsum, int packing, int noxattr)
967 struct btrfs_key inode_key;
968 struct btrfs_inode_item btrfs_inode;
970 if (ext2_inode->i_links_count == 0)
973 copy_inode_item(&btrfs_inode, ext2_inode, ext2_fs->blocksize);
974 if (!datacsum && S_ISREG(ext2_inode->i_mode)) {
975 u32 flags = btrfs_stack_inode_flags(&btrfs_inode) |
976 BTRFS_INODE_NODATASUM;
977 btrfs_set_stack_inode_flags(&btrfs_inode, flags);
980 switch (ext2_inode->i_mode & S_IFMT) {
982 ret = create_file_extents(trans, root, objectid, &btrfs_inode,
983 ext2_fs, ext2_ino, datacsum, packing);
986 ret = create_dir_entries(trans, root, objectid, &btrfs_inode,
990 ret = create_symbol_link(trans, root, objectid, &btrfs_inode,
991 ext2_fs, ext2_ino, ext2_inode);
1001 ret = copy_extended_attrs(trans, root, objectid, &btrfs_inode,
1006 inode_key.objectid = objectid;
1007 inode_key.offset = 0;
1008 btrfs_set_key_type(&inode_key, BTRFS_INODE_ITEM_KEY);
1009 ret = btrfs_insert_inode(trans, root, objectid, &btrfs_inode);
1013 static int copy_disk_extent(struct btrfs_root *root, u64 dst_bytenr,
1014 u64 src_bytenr, u32 num_bytes)
1018 struct btrfs_fs_devices *fs_devs = root->fs_info->fs_devices;
1020 buffer = malloc(num_bytes);
1023 ret = pread(fs_devs->latest_bdev, buffer, num_bytes, src_bytenr);
1024 if (ret != num_bytes)
1026 ret = pwrite(fs_devs->latest_bdev, buffer, num_bytes, dst_bytenr);
1027 if (ret != num_bytes)
1037 * scan ext2's inode bitmap and copy all used inodes.
1039 static int copy_inodes(struct btrfs_root *root, ext2_filsys ext2_fs,
1040 int datacsum, int packing, int noxattr)
1044 ext2_inode_scan ext2_scan;
1045 struct ext2_inode ext2_inode;
1046 ext2_ino_t ext2_ino;
1048 struct btrfs_trans_handle *trans;
1050 trans = btrfs_start_transaction(root, 1);
1053 err = ext2fs_open_inode_scan(ext2_fs, 0, &ext2_scan);
1055 fprintf(stderr, "ext2fs_open_inode_scan: %s\n", error_message(err));
1058 while (!(err = ext2fs_get_next_inode(ext2_scan, &ext2_ino,
1060 /* no more inodes */
1063 /* skip special inode in ext2fs */
1064 if (ext2_ino < EXT2_GOOD_OLD_FIRST_INO &&
1065 ext2_ino != EXT2_ROOT_INO)
1067 objectid = ext2_ino + INO_OFFSET;
1068 ret = copy_single_inode(trans, root,
1069 objectid, ext2_fs, ext2_ino,
1070 &ext2_inode, datacsum, packing,
1074 if (trans->blocks_used >= 4096) {
1075 ret = btrfs_commit_transaction(trans, root);
1077 trans = btrfs_start_transaction(root, 1);
1082 fprintf(stderr, "ext2fs_get_next_inode: %s\n", error_message(err));
1085 ret = btrfs_commit_transaction(trans, root);
1092 * Construct a range of ext2fs image file.
1093 * scan block allocation bitmap, find all blocks used by the ext2fs
1094 * in this range and create file extents that point to these blocks.
1096 * Note: Before calling the function, no file extent points to blocks
1099 static int create_image_file_range(struct btrfs_trans_handle *trans,
1100 struct btrfs_root *root, u64 objectid,
1101 struct btrfs_inode_item *inode,
1102 u64 start_byte, u64 end_byte,
1103 ext2_filsys ext2_fs)
1105 u32 blocksize = ext2_fs->blocksize;
1106 u32 block = start_byte / blocksize;
1107 u32 last_block = (end_byte + blocksize - 1) / blocksize;
1109 struct blk_iterate_data data = {
1113 .objectid = objectid,
1114 .first_block = block,
1117 .boundary = (u64)-1,
1121 for (; start_byte < end_byte; block++, start_byte += blocksize) {
1122 if (!ext2fs_fast_test_block_bitmap(ext2_fs->block_map, block))
1124 ret = block_iterate_proc(NULL, block, block, &data);
1125 if (ret & BLOCK_ABORT) {
1130 if (data.num_blocks > 0) {
1131 ret = record_file_blocks(trans, root, objectid, inode,
1132 data.first_block, data.disk_block,
1133 data.num_blocks, 0);
1136 data.first_block += data.num_blocks;
1138 if (last_block > data.first_block) {
1139 ret = record_file_blocks(trans, root, objectid, inode,
1140 data.first_block, 0, last_block -
1141 data.first_block, 0);
1149 * Create the ext2fs image file.
1151 static int create_ext2_image(struct btrfs_root *root, ext2_filsys ext2_fs,
1155 struct btrfs_key key;
1156 struct btrfs_key location;
1157 struct btrfs_path path;
1158 struct btrfs_inode_item btrfs_inode;
1159 struct btrfs_inode_item *inode_item;
1160 struct extent_buffer *leaf;
1161 struct btrfs_fs_info *fs_info = root->fs_info;
1162 struct btrfs_root *extent_root = fs_info->extent_root;
1163 struct btrfs_trans_handle *trans;
1164 struct btrfs_extent_item *ei;
1165 struct btrfs_extent_inline_ref *iref;
1166 struct btrfs_extent_data_ref *dref;
1173 u32 sectorsize = root->sectorsize;
1175 total_bytes = btrfs_super_total_bytes(fs_info->super_copy);
1176 first_free = BTRFS_SUPER_INFO_OFFSET + sectorsize * 2 - 1;
1177 first_free &= ~((u64)sectorsize - 1);
1179 memset(&btrfs_inode, 0, sizeof(btrfs_inode));
1180 btrfs_set_stack_inode_generation(&btrfs_inode, 1);
1181 btrfs_set_stack_inode_size(&btrfs_inode, total_bytes);
1182 btrfs_set_stack_inode_nlink(&btrfs_inode, 1);
1183 btrfs_set_stack_inode_nbytes(&btrfs_inode, 0);
1184 btrfs_set_stack_inode_mode(&btrfs_inode, S_IFREG | 0400);
1185 btrfs_set_stack_inode_flags(&btrfs_inode, BTRFS_INODE_NODATASUM |
1186 BTRFS_INODE_READONLY);
1187 btrfs_init_path(&path);
1188 trans = btrfs_start_transaction(root, 1);
1191 objectid = btrfs_root_dirid(&root->root_item);
1192 ret = btrfs_find_free_objectid(trans, root, objectid, &objectid);
1197 * copy blocks covered by extent #0 to new positions. extent #0 is
1198 * special, we can't rely on relocate_extents_range to relocate it.
1200 for (last_byte = 0; last_byte < first_free; last_byte += sectorsize) {
1201 ret = custom_alloc_extent(root, sectorsize, 0, &key);
1204 ret = copy_disk_extent(root, key.objectid, last_byte,
1208 ret = btrfs_record_file_extent(trans, root, objectid,
1209 &btrfs_inode, last_byte,
1210 key.objectid, sectorsize);
1216 key.objectid = last_byte;
1218 btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY);
1219 ret = btrfs_search_slot(trans, fs_info->extent_root,
1224 leaf = path.nodes[0];
1225 if (path.slots[0] >= btrfs_header_nritems(leaf)) {
1226 ret = btrfs_next_leaf(extent_root, &path);
1231 leaf = path.nodes[0];
1233 btrfs_item_key_to_cpu(leaf, &key, path.slots[0]);
1234 if (last_byte > key.objectid ||
1235 key.type != BTRFS_EXTENT_ITEM_KEY) {
1240 bytenr = key.objectid;
1241 num_bytes = key.offset;
1242 ei = btrfs_item_ptr(leaf, path.slots[0],
1243 struct btrfs_extent_item);
1244 if (!(btrfs_extent_flags(leaf, ei) & BTRFS_EXTENT_FLAG_DATA)) {
1249 BUG_ON(btrfs_item_size_nr(leaf, path.slots[0]) != sizeof(*ei) +
1250 btrfs_extent_inline_ref_size(BTRFS_EXTENT_DATA_REF_KEY));
1252 iref = (struct btrfs_extent_inline_ref *)(ei + 1);
1253 key.type = btrfs_extent_inline_ref_type(leaf, iref);
1254 BUG_ON(key.type != BTRFS_EXTENT_DATA_REF_KEY);
1255 dref = (struct btrfs_extent_data_ref *)(&iref->offset);
1256 if (btrfs_extent_data_ref_root(leaf, dref) !=
1257 BTRFS_FS_TREE_OBJECTID) {
1262 if (bytenr > last_byte) {
1263 ret = create_image_file_range(trans, root, objectid,
1264 &btrfs_inode, last_byte,
1269 ret = btrfs_record_file_extent(trans, root, objectid,
1270 &btrfs_inode, bytenr, bytenr,
1274 last_byte = bytenr + num_bytes;
1275 btrfs_release_path(&path);
1277 if (trans->blocks_used >= 4096) {
1278 ret = btrfs_commit_transaction(trans, root);
1280 trans = btrfs_start_transaction(root, 1);
1284 btrfs_release_path(&path);
1285 if (total_bytes > last_byte) {
1286 ret = create_image_file_range(trans, root, objectid,
1287 &btrfs_inode, last_byte,
1288 total_bytes, ext2_fs);
1293 ret = btrfs_insert_inode(trans, root, objectid, &btrfs_inode);
1297 location.objectid = objectid;
1298 location.offset = 0;
1299 btrfs_set_key_type(&location, BTRFS_INODE_ITEM_KEY);
1300 ret = btrfs_insert_dir_item(trans, root, name, strlen(name),
1301 btrfs_root_dirid(&root->root_item),
1302 &location, EXT2_FT_REG_FILE, objectid);
1305 ret = btrfs_insert_inode_ref(trans, root, name, strlen(name),
1307 btrfs_root_dirid(&root->root_item),
1311 location.objectid = btrfs_root_dirid(&root->root_item);
1312 location.offset = 0;
1313 btrfs_set_key_type(&location, BTRFS_INODE_ITEM_KEY);
1314 ret = btrfs_lookup_inode(trans, root, &path, &location, 1);
1317 leaf = path.nodes[0];
1318 inode_item = btrfs_item_ptr(leaf, path.slots[0],
1319 struct btrfs_inode_item);
1320 btrfs_set_inode_size(leaf, inode_item, strlen(name) * 2 +
1321 btrfs_inode_size(leaf, inode_item));
1322 btrfs_mark_buffer_dirty(leaf);
1323 btrfs_release_path(&path);
1324 ret = btrfs_commit_transaction(trans, root);
1327 btrfs_release_path(&path);
1331 static struct btrfs_root * link_subvol(struct btrfs_root *root,
1332 const char *base, u64 root_objectid)
1334 struct btrfs_trans_handle *trans;
1335 struct btrfs_fs_info *fs_info = root->fs_info;
1336 struct btrfs_root *tree_root = fs_info->tree_root;
1337 struct btrfs_root *new_root = NULL;
1338 struct btrfs_path *path;
1339 struct btrfs_inode_item *inode_item;
1340 struct extent_buffer *leaf;
1341 struct btrfs_key key;
1342 u64 dirid = btrfs_root_dirid(&root->root_item);
1344 char buf[BTRFS_NAME_LEN + 1]; /* for snprintf null */
1350 if (len < 1 || len > BTRFS_NAME_LEN)
1353 path = btrfs_alloc_path();
1356 key.objectid = dirid;
1357 key.type = BTRFS_DIR_INDEX_KEY;
1358 key.offset = (u64)-1;
1360 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1363 if (path->slots[0] > 0) {
1365 btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
1366 if (key.objectid == dirid && key.type == BTRFS_DIR_INDEX_KEY)
1367 index = key.offset + 1;
1369 btrfs_release_path(path);
1371 trans = btrfs_start_transaction(root, 1);
1374 key.objectid = dirid;
1376 key.type = BTRFS_INODE_ITEM_KEY;
1378 ret = btrfs_lookup_inode(trans, root, path, &key, 1);
1380 leaf = path->nodes[0];
1381 inode_item = btrfs_item_ptr(leaf, path->slots[0],
1382 struct btrfs_inode_item);
1384 key.objectid = root_objectid;
1385 key.offset = (u64)-1;
1386 key.type = BTRFS_ROOT_ITEM_KEY;
1388 memcpy(buf, base, len);
1389 for (i = 0; i < 1024; i++) {
1390 ret = btrfs_insert_dir_item(trans, root, buf, len,
1391 dirid, &key, BTRFS_FT_DIR, index);
1394 len = snprintf(buf, ARRAY_SIZE(buf), "%s%d", base, i);
1395 if (len < 1 || len > BTRFS_NAME_LEN) {
1403 btrfs_set_inode_size(leaf, inode_item, len * 2 +
1404 btrfs_inode_size(leaf, inode_item));
1405 btrfs_mark_buffer_dirty(leaf);
1406 btrfs_release_path(path);
1408 /* add the backref first */
1409 ret = btrfs_add_root_ref(trans, tree_root, root_objectid,
1410 BTRFS_ROOT_BACKREF_KEY,
1411 root->root_key.objectid,
1412 dirid, index, buf, len);
1415 /* now add the forward ref */
1416 ret = btrfs_add_root_ref(trans, tree_root, root->root_key.objectid,
1417 BTRFS_ROOT_REF_KEY, root_objectid,
1418 dirid, index, buf, len);
1420 ret = btrfs_commit_transaction(trans, root);
1423 new_root = btrfs_read_fs_root(fs_info, &key);
1424 if (IS_ERR(new_root))
1427 btrfs_free_path(path);
1431 static int create_chunk_mapping(struct btrfs_trans_handle *trans,
1432 struct btrfs_root *root)
1434 struct btrfs_fs_info *info = root->fs_info;
1435 struct btrfs_root *chunk_root = info->chunk_root;
1436 struct btrfs_root *extent_root = info->extent_root;
1437 struct btrfs_device *device;
1438 struct btrfs_block_group_cache *cache;
1439 struct btrfs_dev_extent *extent;
1440 struct extent_buffer *leaf;
1441 struct btrfs_chunk chunk;
1442 struct btrfs_key key;
1443 struct btrfs_path path;
1449 btrfs_init_path(&path);
1451 total_bytes = btrfs_super_total_bytes(root->fs_info->super_copy);
1452 chunk_objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID;
1454 BUG_ON(list_empty(&info->fs_devices->devices));
1455 device = list_entry(info->fs_devices->devices.next,
1456 struct btrfs_device, dev_list);
1457 BUG_ON(device->devid != info->fs_devices->latest_devid);
1459 /* delete device extent created by make_btrfs */
1460 key.objectid = device->devid;
1462 key.type = BTRFS_DEV_EXTENT_KEY;
1463 ret = btrfs_search_slot(trans, device->dev_root, &key, &path, -1, 1);
1468 ret = btrfs_del_item(trans, device->dev_root, &path);
1471 btrfs_release_path(&path);
1473 /* delete chunk item created by make_btrfs */
1474 key.objectid = chunk_objectid;
1476 key.type = BTRFS_CHUNK_ITEM_KEY;
1477 ret = btrfs_search_slot(trans, chunk_root, &key, &path, -1, 1);
1482 ret = btrfs_del_item(trans, chunk_root, &path);
1485 btrfs_release_path(&path);
1487 /* for each block group, create device extent and chunk item */
1489 while (cur_start < total_bytes) {
1490 cache = btrfs_lookup_block_group(root->fs_info, cur_start);
1493 /* insert device extent */
1494 key.objectid = device->devid;
1495 key.offset = cache->key.objectid;
1496 key.type = BTRFS_DEV_EXTENT_KEY;
1497 ret = btrfs_insert_empty_item(trans, device->dev_root, &path,
1498 &key, sizeof(*extent));
1502 leaf = path.nodes[0];
1503 extent = btrfs_item_ptr(leaf, path.slots[0],
1504 struct btrfs_dev_extent);
1506 btrfs_set_dev_extent_chunk_tree(leaf, extent,
1507 chunk_root->root_key.objectid);
1508 btrfs_set_dev_extent_chunk_objectid(leaf, extent,
1510 btrfs_set_dev_extent_chunk_offset(leaf, extent,
1511 cache->key.objectid);
1512 btrfs_set_dev_extent_length(leaf, extent, cache->key.offset);
1513 write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid,
1514 (unsigned long)btrfs_dev_extent_chunk_tree_uuid(extent),
1516 btrfs_mark_buffer_dirty(leaf);
1517 btrfs_release_path(&path);
1519 /* insert chunk item */
1520 btrfs_set_stack_chunk_length(&chunk, cache->key.offset);
1521 btrfs_set_stack_chunk_owner(&chunk,
1522 extent_root->root_key.objectid);
1523 btrfs_set_stack_chunk_stripe_len(&chunk, STRIPE_LEN);
1524 btrfs_set_stack_chunk_type(&chunk, cache->flags);
1525 btrfs_set_stack_chunk_io_align(&chunk, device->io_align);
1526 btrfs_set_stack_chunk_io_width(&chunk, device->io_width);
1527 btrfs_set_stack_chunk_sector_size(&chunk, device->sector_size);
1528 btrfs_set_stack_chunk_num_stripes(&chunk, 1);
1529 btrfs_set_stack_chunk_sub_stripes(&chunk, 0);
1530 btrfs_set_stack_stripe_devid(&chunk.stripe, device->devid);
1531 btrfs_set_stack_stripe_offset(&chunk.stripe,
1532 cache->key.objectid);
1533 memcpy(&chunk.stripe.dev_uuid, device->uuid, BTRFS_UUID_SIZE);
1535 key.objectid = chunk_objectid;
1536 key.offset = cache->key.objectid;
1537 key.type = BTRFS_CHUNK_ITEM_KEY;
1539 ret = btrfs_insert_item(trans, chunk_root, &key, &chunk,
1540 btrfs_chunk_item_size(1));
1544 cur_start = cache->key.objectid + cache->key.offset;
1547 device->bytes_used = total_bytes;
1548 ret = btrfs_update_device(trans, device);
1550 btrfs_release_path(&path);
1554 static int create_subvol(struct btrfs_trans_handle *trans,
1555 struct btrfs_root *root, u64 root_objectid)
1557 struct extent_buffer *tmp;
1558 struct btrfs_root *new_root;
1559 struct btrfs_key key;
1560 struct btrfs_root_item root_item;
1563 ret = btrfs_copy_root(trans, root, root->node, &tmp,
1567 memcpy(&root_item, &root->root_item, sizeof(root_item));
1568 btrfs_set_root_bytenr(&root_item, tmp->start);
1569 btrfs_set_root_level(&root_item, btrfs_header_level(tmp));
1570 btrfs_set_root_generation(&root_item, trans->transid);
1571 free_extent_buffer(tmp);
1573 key.objectid = root_objectid;
1574 key.type = BTRFS_ROOT_ITEM_KEY;
1575 key.offset = trans->transid;
1576 ret = btrfs_insert_root(trans, root->fs_info->tree_root,
1579 key.offset = (u64)-1;
1580 new_root = btrfs_read_fs_root(root->fs_info, &key);
1581 BUG_ON(!new_root || IS_ERR(new_root));
1583 ret = btrfs_make_root_dir(trans, new_root, BTRFS_FIRST_FREE_OBJECTID);
1589 static int init_btrfs(struct btrfs_root *root)
1592 struct btrfs_key location;
1593 struct btrfs_trans_handle *trans;
1594 struct btrfs_fs_info *fs_info = root->fs_info;
1595 struct extent_buffer *tmp;
1597 trans = btrfs_start_transaction(root, 1);
1599 ret = btrfs_make_block_groups(trans, root);
1602 ret = btrfs_fix_block_accounting(trans, root);
1605 ret = create_chunk_mapping(trans, root);
1608 ret = btrfs_make_root_dir(trans, fs_info->tree_root,
1609 BTRFS_ROOT_TREE_DIR_OBJECTID);
1612 memcpy(&location, &root->root_key, sizeof(location));
1613 location.offset = (u64)-1;
1614 ret = btrfs_insert_dir_item(trans, fs_info->tree_root, "default", 7,
1615 btrfs_super_root_dir(fs_info->super_copy),
1616 &location, BTRFS_FT_DIR, 0);
1619 ret = btrfs_insert_inode_ref(trans, fs_info->tree_root, "default", 7,
1621 btrfs_super_root_dir(fs_info->super_copy), 0);
1624 btrfs_set_root_dirid(&fs_info->fs_root->root_item,
1625 BTRFS_FIRST_FREE_OBJECTID);
1627 /* subvol for ext2 image file */
1628 ret = create_subvol(trans, root, EXT2_IMAGE_SUBVOL_OBJECTID);
1630 /* subvol for data relocation */
1631 ret = create_subvol(trans, root, BTRFS_DATA_RELOC_TREE_OBJECTID);
1634 extent_buffer_get(fs_info->csum_root->node);
1635 ret = __btrfs_cow_block(trans, fs_info->csum_root,
1636 fs_info->csum_root->node, NULL, 0, &tmp, 0, 0);
1638 free_extent_buffer(tmp);
1640 ret = btrfs_commit_transaction(trans, root);
1647 * Migrate super block to it's default position and zero 0 ~ 16k
1649 static int migrate_super_block(int fd, u64 old_bytenr, u32 sectorsize)
1652 struct extent_buffer *buf;
1653 struct btrfs_super_block *super;
1657 BUG_ON(sectorsize < sizeof(*super));
1658 buf = malloc(sizeof(*buf) + sectorsize);
1662 buf->len = sectorsize;
1663 ret = pread(fd, buf->data, sectorsize, old_bytenr);
1664 if (ret != sectorsize)
1667 super = (struct btrfs_super_block *)buf->data;
1668 BUG_ON(btrfs_super_bytenr(super) != old_bytenr);
1669 btrfs_set_super_bytenr(super, BTRFS_SUPER_INFO_OFFSET);
1671 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
1672 ret = pwrite(fd, buf->data, sectorsize, BTRFS_SUPER_INFO_OFFSET);
1673 if (ret != sectorsize)
1680 memset(buf->data, 0, sectorsize);
1681 for (bytenr = 0; bytenr < BTRFS_SUPER_INFO_OFFSET; ) {
1682 len = BTRFS_SUPER_INFO_OFFSET - bytenr;
1683 if (len > sectorsize)
1685 ret = pwrite(fd, buf->data, len, bytenr);
1687 fprintf(stderr, "unable to zero fill device\n");
1701 static int prepare_system_chunk_sb(struct btrfs_super_block *super)
1703 struct btrfs_chunk *chunk;
1704 struct btrfs_disk_key *key;
1705 u32 sectorsize = btrfs_super_sectorsize(super);
1707 key = (struct btrfs_disk_key *)(super->sys_chunk_array);
1708 chunk = (struct btrfs_chunk *)(super->sys_chunk_array +
1709 sizeof(struct btrfs_disk_key));
1711 btrfs_set_disk_key_objectid(key, BTRFS_FIRST_CHUNK_TREE_OBJECTID);
1712 btrfs_set_disk_key_type(key, BTRFS_CHUNK_ITEM_KEY);
1713 btrfs_set_disk_key_offset(key, 0);
1715 btrfs_set_stack_chunk_length(chunk, btrfs_super_total_bytes(super));
1716 btrfs_set_stack_chunk_owner(chunk, BTRFS_EXTENT_TREE_OBJECTID);
1717 btrfs_set_stack_chunk_stripe_len(chunk, 64 * 1024);
1718 btrfs_set_stack_chunk_type(chunk, BTRFS_BLOCK_GROUP_SYSTEM);
1719 btrfs_set_stack_chunk_io_align(chunk, sectorsize);
1720 btrfs_set_stack_chunk_io_width(chunk, sectorsize);
1721 btrfs_set_stack_chunk_sector_size(chunk, sectorsize);
1722 btrfs_set_stack_chunk_num_stripes(chunk, 1);
1723 btrfs_set_stack_chunk_sub_stripes(chunk, 0);
1724 chunk->stripe.devid = super->dev_item.devid;
1725 btrfs_set_stack_stripe_offset(&chunk->stripe, 0);
1726 memcpy(chunk->stripe.dev_uuid, super->dev_item.uuid, BTRFS_UUID_SIZE);
1727 btrfs_set_super_sys_array_size(super, sizeof(*key) + sizeof(*chunk));
1731 static int prepare_system_chunk(int fd, u64 sb_bytenr, u32 sectorsize)
1734 struct extent_buffer *buf;
1735 struct btrfs_super_block *super;
1737 BUG_ON(sectorsize < sizeof(*super));
1738 buf = malloc(sizeof(*buf) + sectorsize);
1742 buf->len = sectorsize;
1743 ret = pread(fd, buf->data, sectorsize, sb_bytenr);
1744 if (ret != sectorsize)
1747 super = (struct btrfs_super_block *)buf->data;
1748 BUG_ON(btrfs_super_bytenr(super) != sb_bytenr);
1749 BUG_ON(btrfs_super_num_devices(super) != 1);
1751 ret = prepare_system_chunk_sb(super);
1755 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
1756 ret = pwrite(fd, buf->data, sectorsize, sb_bytenr);
1757 if (ret != sectorsize)
1768 static int relocate_one_reference(struct btrfs_trans_handle *trans,
1769 struct btrfs_root *root,
1770 u64 extent_start, u64 extent_size,
1771 struct btrfs_key *extent_key,
1772 struct extent_io_tree *reloc_tree)
1774 struct extent_buffer *leaf;
1775 struct btrfs_file_extent_item *fi;
1776 struct btrfs_key key;
1777 struct btrfs_path path;
1778 struct btrfs_inode_item inode;
1779 struct blk_iterate_data data;
1786 u32 sectorsize = root->sectorsize;
1792 btrfs_init_path(&path);
1793 ret = btrfs_search_slot(trans, root, extent_key, &path, -1, 1);
1797 leaf = path.nodes[0];
1798 fi = btrfs_item_ptr(leaf, path.slots[0],
1799 struct btrfs_file_extent_item);
1800 BUG_ON(btrfs_file_extent_offset(leaf, fi) > 0);
1801 if (extent_start != btrfs_file_extent_disk_bytenr(leaf, fi) ||
1802 extent_size != btrfs_file_extent_disk_num_bytes(leaf, fi)) {
1807 bytenr = extent_start + btrfs_file_extent_offset(leaf, fi);
1808 num_bytes = btrfs_file_extent_num_bytes(leaf, fi);
1810 ret = btrfs_del_item(trans, root, &path);
1814 ret = btrfs_free_extent(trans, root, extent_start, extent_size, 0,
1815 root->root_key.objectid,
1816 extent_key->objectid, extent_key->offset);
1820 btrfs_release_path(&path);
1822 key.objectid = extent_key->objectid;
1824 key.type = BTRFS_INODE_ITEM_KEY;
1825 ret = btrfs_lookup_inode(trans, root, &path, &key, 0);
1829 leaf = path.nodes[0];
1830 ptr = btrfs_item_ptr_offset(leaf, path.slots[0]);
1831 read_extent_buffer(leaf, &inode, ptr, sizeof(inode));
1832 btrfs_release_path(&path);
1834 BUG_ON(num_bytes & (sectorsize - 1));
1835 nbytes = btrfs_stack_inode_nbytes(&inode) - num_bytes;
1836 btrfs_set_stack_inode_nbytes(&inode, nbytes);
1837 datacsum = !(btrfs_stack_inode_flags(&inode) & BTRFS_INODE_NODATASUM);
1839 data = (struct blk_iterate_data) {
1843 .objectid = extent_key->objectid,
1844 .first_block = extent_key->offset / sectorsize,
1847 .boundary = (u64)-1,
1848 .checksum = datacsum,
1852 cur_offset = extent_key->offset;
1853 while (num_bytes > 0) {
1854 sector_end = bytenr + sectorsize - 1;
1855 if (test_range_bit(reloc_tree, bytenr, sector_end,
1856 EXTENT_LOCKED, 1)) {
1857 ret = get_state_private(reloc_tree, bytenr, &new_pos);
1860 ret = custom_alloc_extent(root, sectorsize, 0, &key);
1863 new_pos = key.objectid;
1865 if (cur_offset == extent_key->offset) {
1866 fd = root->fs_info->fs_devices->latest_bdev;
1867 readahead(fd, bytenr, num_bytes);
1869 ret = copy_disk_extent(root, new_pos, bytenr,
1873 ret = set_extent_bits(reloc_tree, bytenr, sector_end,
1874 EXTENT_LOCKED, GFP_NOFS);
1876 ret = set_state_private(reloc_tree, bytenr, new_pos);
1880 ret = block_iterate_proc(NULL, new_pos / sectorsize,
1881 cur_offset / sectorsize, &data);
1882 if (ret & BLOCK_ABORT) {
1887 cur_offset += sectorsize;
1888 bytenr += sectorsize;
1889 num_bytes -= sectorsize;
1892 if (data.num_blocks > 0) {
1893 ret = record_file_blocks(trans, root,
1894 extent_key->objectid, &inode,
1895 data.first_block, data.disk_block,
1896 data.num_blocks, datacsum);
1901 key.objectid = extent_key->objectid;
1903 key.type = BTRFS_INODE_ITEM_KEY;
1904 ret = btrfs_lookup_inode(trans, root, &path, &key, 1);
1908 leaf = path.nodes[0];
1909 ptr = btrfs_item_ptr_offset(leaf, path.slots[0]);
1910 write_extent_buffer(leaf, &inode, ptr, sizeof(inode));
1911 btrfs_mark_buffer_dirty(leaf);
1912 btrfs_release_path(&path);
1915 btrfs_release_path(&path);
1919 static int relocate_extents_range(struct btrfs_root *fs_root,
1920 struct btrfs_root *ext2_root,
1921 u64 start_byte, u64 end_byte)
1923 struct btrfs_fs_info *info = fs_root->fs_info;
1924 struct btrfs_root *extent_root = info->extent_root;
1925 struct btrfs_root *cur_root = NULL;
1926 struct btrfs_trans_handle *trans;
1927 struct btrfs_extent_data_ref *dref;
1928 struct btrfs_extent_inline_ref *iref;
1929 struct btrfs_extent_item *ei;
1930 struct extent_buffer *leaf;
1931 struct btrfs_key key;
1932 struct btrfs_key extent_key;
1933 struct btrfs_path path;
1934 struct extent_io_tree reloc_tree;
1944 btrfs_init_path(&path);
1945 extent_io_tree_init(&reloc_tree);
1947 key.objectid = start_byte;
1949 key.type = BTRFS_EXTENT_ITEM_KEY;
1950 ret = btrfs_search_slot(NULL, extent_root, &key, &path, 0, 0);
1954 ret = btrfs_previous_item(extent_root, &path, 0,
1955 BTRFS_EXTENT_ITEM_KEY);
1959 leaf = path.nodes[0];
1960 btrfs_item_key_to_cpu(leaf, &key, path.slots[0]);
1961 if (key.objectid + key.offset > start_byte)
1962 start_byte = key.objectid;
1965 btrfs_release_path(&path);
1967 cur_root = (pass % 2 == 0) ? ext2_root : fs_root;
1970 trans = btrfs_start_transaction(cur_root, 1);
1973 cur_byte = start_byte;
1975 key.objectid = cur_byte;
1977 key.type = BTRFS_EXTENT_ITEM_KEY;
1978 ret = btrfs_search_slot(trans, extent_root,
1983 leaf = path.nodes[0];
1984 if (path.slots[0] >= btrfs_header_nritems(leaf)) {
1985 ret = btrfs_next_leaf(extent_root, &path);
1990 leaf = path.nodes[0];
1993 btrfs_item_key_to_cpu(leaf, &key, path.slots[0]);
1994 if (key.objectid < cur_byte ||
1995 key.type != BTRFS_EXTENT_ITEM_KEY) {
1999 if (key.objectid >= end_byte)
2004 cur_byte = key.objectid;
2005 num_bytes = key.offset;
2006 ei = btrfs_item_ptr(leaf, path.slots[0],
2007 struct btrfs_extent_item);
2008 BUG_ON(!(btrfs_extent_flags(leaf, ei) &
2009 BTRFS_EXTENT_FLAG_DATA));
2011 ptr = btrfs_item_ptr_offset(leaf, path.slots[0]);
2012 end = ptr + btrfs_item_size_nr(leaf, path.slots[0]);
2014 ptr += sizeof(struct btrfs_extent_item);
2017 iref = (struct btrfs_extent_inline_ref *)ptr;
2018 key.type = btrfs_extent_inline_ref_type(leaf, iref);
2019 BUG_ON(key.type != BTRFS_EXTENT_DATA_REF_KEY);
2020 dref = (struct btrfs_extent_data_ref *)(&iref->offset);
2021 ref_root = btrfs_extent_data_ref_root(leaf, dref);
2022 extent_key.objectid =
2023 btrfs_extent_data_ref_objectid(leaf, dref);
2025 btrfs_extent_data_ref_offset(leaf, dref);
2026 extent_key.type = BTRFS_EXTENT_DATA_KEY;
2027 BUG_ON(btrfs_extent_data_ref_count(leaf, dref) != 1);
2029 if (ref_root == cur_root->root_key.objectid)
2032 ptr += btrfs_extent_inline_ref_size(key.type);
2040 ret = relocate_one_reference(trans, cur_root, cur_byte,
2041 num_bytes, &extent_key,
2046 cur_byte += num_bytes;
2047 btrfs_release_path(&path);
2049 if (trans->blocks_used >= 4096) {
2050 ret = btrfs_commit_transaction(trans, cur_root);
2052 trans = btrfs_start_transaction(cur_root, 1);
2056 btrfs_release_path(&path);
2058 ret = btrfs_commit_transaction(trans, cur_root);
2061 if (num_extents > 0 && pass++ < 16)
2064 ret = (num_extents > 0) ? -1 : 0;
2066 btrfs_release_path(&path);
2067 extent_io_tree_cleanup(&reloc_tree);
2072 * relocate data in system chunk
2074 static int cleanup_sys_chunk(struct btrfs_root *fs_root,
2075 struct btrfs_root *ext2_root)
2077 struct btrfs_block_group_cache *cache;
2083 cache = btrfs_lookup_block_group(fs_root->fs_info, offset);
2087 end_byte = cache->key.objectid + cache->key.offset;
2088 if (cache->flags & BTRFS_BLOCK_GROUP_SYSTEM) {
2089 ret = relocate_extents_range(fs_root, ext2_root,
2090 cache->key.objectid,
2097 for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
2098 offset = btrfs_sb_offset(i);
2099 offset &= ~((u64)STRIPE_LEN - 1);
2101 ret = relocate_extents_range(fs_root, ext2_root,
2102 offset, offset + STRIPE_LEN);
2111 static int fixup_chunk_mapping(struct btrfs_root *root)
2113 struct btrfs_trans_handle *trans;
2114 struct btrfs_fs_info *info = root->fs_info;
2115 struct btrfs_root *chunk_root = info->chunk_root;
2116 struct extent_buffer *leaf;
2117 struct btrfs_key key;
2118 struct btrfs_path path;
2119 struct btrfs_chunk chunk;
2125 btrfs_init_path(&path);
2127 trans = btrfs_start_transaction(root, 1);
2131 * recow the whole chunk tree. this will move all chunk tree blocks
2132 * into system block group.
2134 memset(&key, 0, sizeof(key));
2136 ret = btrfs_search_slot(trans, chunk_root, &key, &path, 0, 1);
2140 ret = btrfs_next_leaf(chunk_root, &path);
2146 btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]);
2147 btrfs_release_path(&path);
2149 btrfs_release_path(&path);
2151 /* fixup the system chunk array in super block */
2152 btrfs_set_super_sys_array_size(info->super_copy, 0);
2154 key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID;
2156 key.type = BTRFS_CHUNK_ITEM_KEY;
2158 ret = btrfs_search_slot(trans, chunk_root, &key, &path, 0, 0);
2163 leaf = path.nodes[0];
2164 if (path.slots[0] >= btrfs_header_nritems(leaf)) {
2165 ret = btrfs_next_leaf(chunk_root, &path);
2170 leaf = path.nodes[0];
2172 btrfs_item_key_to_cpu(leaf, &key, path.slots[0]);
2173 if (key.type != BTRFS_CHUNK_ITEM_KEY)
2176 ptr = btrfs_item_ptr_offset(leaf, path.slots[0]);
2177 size = btrfs_item_size_nr(leaf, path.slots[0]);
2178 BUG_ON(size != sizeof(chunk));
2179 read_extent_buffer(leaf, &chunk, ptr, size);
2180 type = btrfs_stack_chunk_type(&chunk);
2182 if (!(type & BTRFS_BLOCK_GROUP_SYSTEM))
2185 ret = btrfs_add_system_chunk(trans, chunk_root, &key,
2193 ret = btrfs_commit_transaction(trans, root);
2196 btrfs_release_path(&path);
2200 static int do_convert(const char *devname, int datacsum, int packing,
2209 ext2_filsys ext2_fs;
2210 struct btrfs_root *root;
2211 struct btrfs_root *ext2_root;
2213 ret = open_ext2fs(devname, &ext2_fs);
2215 fprintf(stderr, "unable to open the Ext2fs\n");
2218 blocksize = ext2_fs->blocksize;
2219 total_bytes = (u64)ext2_fs->super->s_blocks_count * blocksize;
2220 if (blocksize < 4096) {
2221 fprintf(stderr, "block size is too small\n");
2224 if (!(ext2_fs->super->s_feature_incompat &
2225 EXT2_FEATURE_INCOMPAT_FILETYPE)) {
2226 fprintf(stderr, "filetype feature is missing\n");
2229 for (i = 0; i < 7; i++) {
2230 ret = ext2_alloc_block(ext2_fs, 0, blocks + i);
2232 fprintf(stderr, "not enough free space\n");
2235 blocks[i] *= blocksize;
2237 super_bytenr = blocks[0];
2238 fd = open(devname, O_RDWR);
2240 fprintf(stderr, "unable to open %s\n", devname);
2243 ret = make_btrfs(fd, devname, ext2_fs->super->s_volume_name,
2244 blocks, total_bytes, blocksize, blocksize,
2245 blocksize, blocksize, 0);
2247 fprintf(stderr, "unable to create initial ctree: %s\n",
2251 /* create a system chunk that maps the whole device */
2252 ret = prepare_system_chunk(fd, super_bytenr, blocksize);
2254 fprintf(stderr, "unable to update system chunk\n");
2257 root = open_ctree_fd(fd, devname, super_bytenr, OPEN_CTREE_WRITES);
2259 fprintf(stderr, "unable to open ctree\n");
2262 ret = cache_free_extents(root, ext2_fs);
2264 fprintf(stderr, "error during cache_free_extents %d\n", ret);
2267 root->fs_info->extent_ops = &extent_ops;
2268 /* recover block allocation bitmap */
2269 for (i = 0; i < 7; i++) {
2270 blocks[i] /= blocksize;
2271 ext2_free_block(ext2_fs, blocks[i]);
2273 ret = init_btrfs(root);
2275 fprintf(stderr, "unable to setup the root tree\n");
2278 printf("creating btrfs metadata.\n");
2279 ret = copy_inodes(root, ext2_fs, datacsum, packing, noxattr);
2281 fprintf(stderr, "error during copy_inodes %d\n", ret);
2284 printf("creating ext2fs image file.\n");
2285 ext2_root = link_subvol(root, "ext2_saved", EXT2_IMAGE_SUBVOL_OBJECTID);
2287 fprintf(stderr, "unable to create subvol\n");
2290 ret = create_ext2_image(ext2_root, ext2_fs, "image");
2292 fprintf(stderr, "error during create_ext2_image %d\n", ret);
2295 printf("cleaning up system chunk.\n");
2296 ret = cleanup_sys_chunk(root, ext2_root);
2298 fprintf(stderr, "error during cleanup_sys_chunk %d\n", ret);
2301 ret = close_ctree(root);
2303 fprintf(stderr, "error during close_ctree %d\n", ret);
2306 close_ext2fs(ext2_fs);
2309 * If this step succeed, we get a mountable btrfs. Otherwise
2310 * the ext2fs is left unchanged.
2312 ret = migrate_super_block(fd, super_bytenr, blocksize);
2314 fprintf(stderr, "unable to migrate super block\n");
2318 root = open_ctree_fd(fd, devname, 0, OPEN_CTREE_WRITES);
2320 fprintf(stderr, "unable to open ctree\n");
2323 /* move chunk tree into system chunk. */
2324 ret = fixup_chunk_mapping(root);
2326 fprintf(stderr, "error during fixup_chunk_tree\n");
2329 ret = close_ctree(root);
2332 printf("conversion complete.\n");
2337 fprintf(stderr, "conversion aborted.\n");
2341 static int may_rollback(struct btrfs_root *root)
2343 struct btrfs_fs_info *info = root->fs_info;
2344 struct btrfs_multi_bio *multi = NULL;
2352 if (btrfs_super_num_devices(info->super_copy) != 1)
2355 bytenr = BTRFS_SUPER_INFO_OFFSET;
2356 total_bytes = btrfs_super_total_bytes(root->fs_info->super_copy);
2359 ret = btrfs_map_block(&info->mapping_tree, WRITE, bytenr,
2360 &length, &multi, 0, NULL);
2364 num_stripes = multi->num_stripes;
2365 physical = multi->stripes[0].physical;
2368 if (num_stripes != 1 || physical != bytenr)
2372 if (bytenr >= total_bytes)
2380 static int do_rollback(const char *devname, int force)
2385 struct btrfs_root *root;
2386 struct btrfs_root *ext2_root;
2387 struct btrfs_root *chunk_root;
2388 struct btrfs_dir_item *dir;
2389 struct btrfs_inode_item *inode;
2390 struct btrfs_file_extent_item *fi;
2391 struct btrfs_trans_handle *trans;
2392 struct extent_buffer *leaf;
2393 struct btrfs_block_group_cache *cache1;
2394 struct btrfs_block_group_cache *cache2;
2395 struct btrfs_key key;
2396 struct btrfs_path path;
2397 struct extent_io_tree io_tree;
2412 extent_io_tree_init(&io_tree);
2414 fd = open(devname, O_RDWR);
2416 fprintf(stderr, "unable to open %s\n", devname);
2419 root = open_ctree_fd(fd, devname, 0, OPEN_CTREE_WRITES);
2421 fprintf(stderr, "unable to open ctree\n");
2424 ret = may_rollback(root);
2426 fprintf(stderr, "unable to do rollback\n");
2430 sectorsize = root->sectorsize;
2431 buf = malloc(sectorsize);
2433 fprintf(stderr, "unable to allocate memory\n");
2437 btrfs_init_path(&path);
2439 key.objectid = EXT2_IMAGE_SUBVOL_OBJECTID;
2440 key.type = BTRFS_ROOT_ITEM_KEY;
2441 key.offset = (u64)-1;
2442 ext2_root = btrfs_read_fs_root(root->fs_info, &key);
2443 if (!ext2_root || IS_ERR(ext2_root)) {
2444 fprintf(stderr, "unable to open subvol %llu\n",
2450 root_dir = btrfs_root_dirid(&root->root_item);
2451 dir = btrfs_lookup_dir_item(NULL, ext2_root, &path,
2452 root_dir, name, strlen(name), 0);
2453 if (!dir || IS_ERR(dir)) {
2454 fprintf(stderr, "unable to find file %s\n", name);
2457 leaf = path.nodes[0];
2458 btrfs_dir_item_key_to_cpu(leaf, dir, &key);
2459 btrfs_release_path(&path);
2461 objectid = key.objectid;
2463 ret = btrfs_lookup_inode(NULL, ext2_root, &path, &key, 0);
2465 fprintf(stderr, "unable to find inode item\n");
2468 leaf = path.nodes[0];
2469 inode = btrfs_item_ptr(leaf, path.slots[0], struct btrfs_inode_item);
2470 total_bytes = btrfs_inode_size(leaf, inode);
2471 btrfs_release_path(&path);
2473 key.objectid = objectid;
2475 btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY);
2476 ret = btrfs_search_slot(NULL, ext2_root, &key, &path, 0, 0);
2478 fprintf(stderr, "unable to find first file extent\n");
2479 btrfs_release_path(&path);
2483 /* build mapping tree for the relocated blocks */
2484 for (offset = 0; offset < total_bytes; ) {
2485 leaf = path.nodes[0];
2486 if (path.slots[0] >= btrfs_header_nritems(leaf)) {
2487 ret = btrfs_next_leaf(root, &path);
2493 btrfs_item_key_to_cpu(leaf, &key, path.slots[0]);
2494 if (key.objectid != objectid || key.offset != offset ||
2495 btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY)
2498 fi = btrfs_item_ptr(leaf, path.slots[0],
2499 struct btrfs_file_extent_item);
2500 if (btrfs_file_extent_type(leaf, fi) != BTRFS_FILE_EXTENT_REG)
2502 if (btrfs_file_extent_compression(leaf, fi) ||
2503 btrfs_file_extent_encryption(leaf, fi) ||
2504 btrfs_file_extent_other_encoding(leaf, fi))
2507 bytenr = btrfs_file_extent_disk_bytenr(leaf, fi);
2508 /* skip holes and direct mapped extents */
2509 if (bytenr == 0 || bytenr == offset)
2512 bytenr += btrfs_file_extent_offset(leaf, fi);
2513 num_bytes = btrfs_file_extent_num_bytes(leaf, fi);
2515 cache1 = btrfs_lookup_block_group(root->fs_info, offset);
2516 cache2 = btrfs_lookup_block_group(root->fs_info,
2517 offset + num_bytes - 1);
2518 if (!cache1 || cache1 != cache2 ||
2519 (!(cache1->flags & BTRFS_BLOCK_GROUP_SYSTEM) &&
2520 !intersect_with_sb(offset, num_bytes)))
2523 set_extent_bits(&io_tree, offset, offset + num_bytes - 1,
2524 EXTENT_LOCKED, GFP_NOFS);
2525 set_state_private(&io_tree, offset, bytenr);
2527 offset += btrfs_file_extent_num_bytes(leaf, fi);
2530 btrfs_release_path(&path);
2532 if (offset < total_bytes) {
2533 fprintf(stderr, "unable to build extent mapping\n");
2537 first_free = BTRFS_SUPER_INFO_OFFSET + 2 * sectorsize - 1;
2538 first_free &= ~((u64)sectorsize - 1);
2539 /* backup for extent #0 should exist */
2540 if(!test_range_bit(&io_tree, 0, first_free - 1, EXTENT_LOCKED, 1)) {
2541 fprintf(stderr, "no backup for the first extent\n");
2544 /* force no allocation from system block group */
2545 root->fs_info->system_allocs = -1;
2546 trans = btrfs_start_transaction(root, 1);
2549 * recow the whole chunk tree, this will remove all chunk tree blocks
2550 * from system block group
2552 chunk_root = root->fs_info->chunk_root;
2553 memset(&key, 0, sizeof(key));
2555 ret = btrfs_search_slot(trans, chunk_root, &key, &path, 0, 1);
2559 ret = btrfs_next_leaf(chunk_root, &path);
2563 btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]);
2564 btrfs_release_path(&path);
2566 btrfs_release_path(&path);
2571 cache1 = btrfs_lookup_block_group(root->fs_info, offset);
2575 if (cache1->flags & BTRFS_BLOCK_GROUP_SYSTEM)
2576 num_bytes += btrfs_block_group_used(&cache1->item);
2578 offset = cache1->key.objectid + cache1->key.offset;
2580 /* only extent #0 left in system block group? */
2581 if (num_bytes > first_free) {
2582 fprintf(stderr, "unable to empty system block group\n");
2585 /* create a system chunk that maps the whole device */
2586 ret = prepare_system_chunk_sb(root->fs_info->super_copy);
2588 fprintf(stderr, "unable to update system chunk\n");
2592 ret = btrfs_commit_transaction(trans, root);
2595 ret = close_ctree(root);
2597 fprintf(stderr, "error during close_ctree %d\n", ret);
2601 /* zero btrfs super block mirrors */
2602 memset(buf, 0, sectorsize);
2603 for (i = 1 ; i < BTRFS_SUPER_MIRROR_MAX; i++) {
2604 bytenr = btrfs_sb_offset(i);
2605 if (bytenr >= total_bytes)
2607 ret = pwrite(fd, buf, sectorsize, bytenr);
2610 sb_bytenr = (u64)-1;
2611 /* copy all relocated blocks back */
2613 ret = find_first_extent_bit(&io_tree, 0, &start, &end,
2618 ret = get_state_private(&io_tree, start, &bytenr);
2621 clear_extent_bits(&io_tree, start, end, EXTENT_LOCKED,
2624 while (start <= end) {
2625 if (start == BTRFS_SUPER_INFO_OFFSET) {
2629 ret = pread(fd, buf, sectorsize, bytenr);
2631 fprintf(stderr, "error during pread %d\n", ret);
2634 BUG_ON(ret != sectorsize);
2635 ret = pwrite(fd, buf, sectorsize, start);
2637 fprintf(stderr, "error during pwrite %d\n", ret);
2640 BUG_ON(ret != sectorsize);
2642 start += sectorsize;
2643 bytenr += sectorsize;
2649 fprintf(stderr, "error during fsync %d\n", ret);
2653 * finally, overwrite btrfs super block.
2655 ret = pread(fd, buf, sectorsize, sb_bytenr);
2657 fprintf(stderr, "error during pread %d\n", ret);
2660 BUG_ON(ret != sectorsize);
2661 ret = pwrite(fd, buf, sectorsize, BTRFS_SUPER_INFO_OFFSET);
2663 fprintf(stderr, "error during pwrite %d\n", ret);
2666 BUG_ON(ret != sectorsize);
2669 fprintf(stderr, "error during fsync %d\n", ret);
2675 extent_io_tree_cleanup(&io_tree);
2676 printf("rollback complete.\n");
2683 fprintf(stderr, "rollback aborted.\n");
2687 static void print_usage(void)
2689 printf("usage: btrfs-convert [-d] [-i] [-n] [-r] device\n");
2690 printf("\t-d disable data checksum\n");
2691 printf("\t-i ignore xattrs and ACLs\n");
2692 printf("\t-n disable packing of small files\n");
2693 printf("\t-r roll back to ext2fs\n");
2696 int main(int argc, char *argv[])
2705 int c = getopt(argc, argv, "dinr");
2726 argc = argc - optind;
2732 file = argv[optind];
2733 if (check_mounted(file)) {
2734 fprintf(stderr, "%s is mounted\n", file);
2739 ret = do_rollback(file, 0);
2741 ret = do_convert(file, datacsum, packing, noxattr);