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 #include "kerncompat.h"
21 #include <sys/ioctl.h>
22 #include <sys/mount.h>
25 #include <sys/types.h>
29 #include <uuid/uuid.h>
30 #include <linux/limits.h>
36 #include "transaction.h"
39 #include "task-utils.h"
40 #include <ext2fs/ext2_fs.h>
41 #include <ext2fs/ext2fs.h>
42 #include <ext2fs/ext2_ext_attr.h>
44 #define INO_OFFSET (BTRFS_FIRST_FREE_OBJECTID - EXT2_ROOT_INO)
45 #define EXT2_IMAGE_SUBVOL_OBJECTID BTRFS_FIRST_FREE_OBJECTID
48 uint32_t max_copy_inodes;
49 uint32_t cur_copy_inodes;
50 struct task_info *info;
53 static void *print_copied_inodes(void *p)
55 struct task_ctx *priv = p;
56 const char work_indicator[] = { '.', 'o', 'O', 'o' };
59 task_period_start(priv->info, 1000 /* 1s */);
62 printf("copy inodes [%c] [%10d/%10d]\r",
63 work_indicator[count % 4], priv->cur_copy_inodes,
64 priv->max_copy_inodes);
66 task_period_wait(priv->info);
72 static int after_copied_inodes(void *p)
74 struct task_ctx *priv = p;
77 task_period_stop(priv->info);
83 * Open Ext2fs in readonly mode, read block allocation bitmap and
84 * inode bitmap into memory.
86 static int open_ext2fs(const char *name, ext2_filsys *ret_fs)
91 ret = ext2fs_open(name, 0, 0, 0, unix_io_manager, &ext2_fs);
93 fprintf(stderr, "ext2fs_open: %s\n", error_message(ret));
96 ret = ext2fs_read_inode_bitmap(ext2_fs);
98 fprintf(stderr, "ext2fs_read_inode_bitmap: %s\n",
102 ret = ext2fs_read_block_bitmap(ext2_fs);
104 fprintf(stderr, "ext2fs_read_block_bitmap: %s\n",
109 * search each block group for a free inode. this set up
110 * uninit block/inode bitmaps appropriately.
113 while (ino <= ext2_fs->super->s_inodes_count) {
115 ext2fs_new_inode(ext2_fs, ino, 0, NULL, &foo);
116 ino += EXT2_INODES_PER_GROUP(ext2_fs->super);
125 static int close_ext2fs(ext2_filsys fs)
131 static int ext2_alloc_block(ext2_filsys fs, u64 goal, u64 *block_ret)
135 if (!ext2fs_new_block(fs, goal, NULL, &block)) {
136 ext2fs_fast_mark_block_bitmap(fs->block_map, block);
143 static int ext2_alloc_block_range(ext2_filsys fs, u64 goal, int num,
147 ext2fs_block_bitmap bitmap = fs->block_map;
148 blk_t start = ext2fs_get_block_bitmap_start(bitmap);
149 blk_t end = ext2fs_get_block_bitmap_end(bitmap);
151 for (block = max_t(u64, goal, start); block + num < end; block++) {
152 if (ext2fs_fast_test_block_bitmap_range(bitmap, block, num)) {
153 ext2fs_fast_mark_block_bitmap_range(bitmap, block,
162 static int ext2_free_block(ext2_filsys fs, u64 block)
164 BUG_ON(block != (blk_t)block);
165 ext2fs_fast_unmark_block_bitmap(fs->block_map, block);
169 static int ext2_free_block_range(ext2_filsys fs, u64 block, int num)
171 BUG_ON(block != (blk_t)block);
172 ext2fs_fast_unmark_block_bitmap_range(fs->block_map, block, num);
176 static int cache_free_extents(struct btrfs_root *root, ext2_filsys ext2_fs)
182 u64 blocksize = ext2_fs->blocksize;
184 block = ext2_fs->super->s_first_data_block;
185 for (; block < ext2_fs->super->s_blocks_count; block++) {
186 if (ext2fs_fast_test_block_bitmap(ext2_fs->block_map, block))
188 bytenr = block * blocksize;
189 ret = set_extent_dirty(&root->fs_info->free_space_cache,
190 bytenr, bytenr + blocksize - 1, 0);
194 for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
195 bytenr = btrfs_sb_offset(i);
196 bytenr &= ~((u64)BTRFS_STRIPE_LEN - 1);
197 if (bytenr >= blocksize * ext2_fs->super->s_blocks_count)
199 clear_extent_dirty(&root->fs_info->free_space_cache, bytenr,
200 bytenr + BTRFS_STRIPE_LEN - 1, 0);
203 clear_extent_dirty(&root->fs_info->free_space_cache,
204 0, BTRFS_SUPER_INFO_OFFSET - 1, 0);
209 static int custom_alloc_extent(struct btrfs_root *root, u64 num_bytes,
210 u64 hint_byte, struct btrfs_key *ins)
214 u64 last = hint_byte;
217 struct btrfs_block_group_cache *cache;
220 ret = find_first_extent_bit(&root->fs_info->free_space_cache,
221 last, &start, &end, EXTENT_DIRTY);
223 if (wrapped++ == 0) {
231 start = max(last, start);
233 if (last - start < num_bytes)
236 last = start + num_bytes;
237 if (test_range_bit(&root->fs_info->pinned_extents,
238 start, last - 1, EXTENT_DIRTY, 0))
241 cache = btrfs_lookup_block_group(root->fs_info, start);
243 if (cache->flags & BTRFS_BLOCK_GROUP_SYSTEM ||
244 last > cache->key.objectid + cache->key.offset) {
245 last = cache->key.objectid + cache->key.offset;
249 clear_extent_dirty(&root->fs_info->free_space_cache,
250 start, start + num_bytes - 1, 0);
252 ins->objectid = start;
253 ins->offset = num_bytes;
254 ins->type = BTRFS_EXTENT_ITEM_KEY;
258 fprintf(stderr, "not enough free space\n");
262 static int intersect_with_sb(u64 bytenr, u64 num_bytes)
267 for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
268 offset = btrfs_sb_offset(i);
269 offset &= ~((u64)BTRFS_STRIPE_LEN - 1);
271 if (bytenr < offset + BTRFS_STRIPE_LEN &&
272 bytenr + num_bytes > offset)
278 static int custom_free_extent(struct btrfs_root *root, u64 bytenr,
281 return intersect_with_sb(bytenr, num_bytes);
284 static struct btrfs_extent_ops extent_ops = {
285 .alloc_extent = custom_alloc_extent,
286 .free_extent = custom_free_extent,
289 struct dir_iterate_data {
290 struct btrfs_trans_handle *trans;
291 struct btrfs_root *root;
292 struct btrfs_inode_item *inode;
299 static u8 filetype_conversion_table[EXT2_FT_MAX] = {
300 [EXT2_FT_UNKNOWN] = BTRFS_FT_UNKNOWN,
301 [EXT2_FT_REG_FILE] = BTRFS_FT_REG_FILE,
302 [EXT2_FT_DIR] = BTRFS_FT_DIR,
303 [EXT2_FT_CHRDEV] = BTRFS_FT_CHRDEV,
304 [EXT2_FT_BLKDEV] = BTRFS_FT_BLKDEV,
305 [EXT2_FT_FIFO] = BTRFS_FT_FIFO,
306 [EXT2_FT_SOCK] = BTRFS_FT_SOCK,
307 [EXT2_FT_SYMLINK] = BTRFS_FT_SYMLINK,
310 static int dir_iterate_proc(ext2_ino_t dir, int entry,
311 struct ext2_dir_entry *dirent,
312 int offset, int blocksize,
313 char *buf,void *priv_data)
319 char dotdot[] = "..";
320 struct btrfs_key location;
321 struct dir_iterate_data *idata = (struct dir_iterate_data *)priv_data;
324 name_len = dirent->name_len & 0xFF;
326 objectid = dirent->inode + INO_OFFSET;
327 if (!strncmp(dirent->name, dotdot, name_len)) {
329 BUG_ON(idata->parent != 0);
330 idata->parent = objectid;
334 if (dirent->inode < EXT2_GOOD_OLD_FIRST_INO)
337 location.objectid = objectid;
339 btrfs_set_key_type(&location, BTRFS_INODE_ITEM_KEY);
341 file_type = dirent->name_len >> 8;
342 BUG_ON(file_type > EXT2_FT_SYMLINK);
343 ret = btrfs_insert_dir_item(idata->trans, idata->root,
344 dirent->name, name_len,
345 idata->objectid, &location,
346 filetype_conversion_table[file_type],
350 ret = btrfs_insert_inode_ref(idata->trans, idata->root,
351 dirent->name, name_len,
352 objectid, idata->objectid,
357 inode_size = btrfs_stack_inode_size(idata->inode) +
359 btrfs_set_stack_inode_size(idata->inode, inode_size);
362 idata->errcode = ret;
366 static int create_dir_entries(struct btrfs_trans_handle *trans,
367 struct btrfs_root *root, u64 objectid,
368 struct btrfs_inode_item *btrfs_inode,
369 ext2_filsys ext2_fs, ext2_ino_t ext2_ino)
373 struct dir_iterate_data data = {
376 .inode = btrfs_inode,
377 .objectid = objectid,
383 err = ext2fs_dir_iterate2(ext2_fs, ext2_ino, 0, NULL,
384 dir_iterate_proc, &data);
388 if (ret == 0 && data.parent == objectid) {
389 ret = btrfs_insert_inode_ref(trans, root, "..", 2,
390 objectid, objectid, 0);
394 fprintf(stderr, "ext2fs_dir_iterate2: %s\n", error_message(err));
398 static int read_disk_extent(struct btrfs_root *root, u64 bytenr,
399 u32 num_bytes, char *buffer)
402 struct btrfs_fs_devices *fs_devs = root->fs_info->fs_devices;
404 ret = pread(fs_devs->latest_bdev, buffer, num_bytes, bytenr);
405 if (ret != num_bytes)
414 static int csum_disk_extent(struct btrfs_trans_handle *trans,
415 struct btrfs_root *root,
416 u64 disk_bytenr, u64 num_bytes)
418 u32 blocksize = root->sectorsize;
423 buffer = malloc(blocksize);
426 for (offset = 0; offset < num_bytes; offset += blocksize) {
427 ret = read_disk_extent(root, disk_bytenr + offset,
431 ret = btrfs_csum_file_block(trans,
432 root->fs_info->csum_root,
433 disk_bytenr + num_bytes,
434 disk_bytenr + offset,
443 static int record_file_blocks(struct btrfs_trans_handle *trans,
444 struct btrfs_root *root, u64 objectid,
445 struct btrfs_inode_item *inode,
446 u64 file_block, u64 disk_block,
447 u64 num_blocks, int checksum)
450 u64 file_pos = file_block * root->sectorsize;
451 u64 disk_bytenr = disk_block * root->sectorsize;
452 u64 num_bytes = num_blocks * root->sectorsize;
453 ret = btrfs_record_file_extent(trans, root, objectid, inode, file_pos,
454 disk_bytenr, num_bytes);
456 if (ret || !checksum || disk_bytenr == 0)
459 return csum_disk_extent(trans, root, disk_bytenr, num_bytes);
462 struct blk_iterate_data {
463 struct btrfs_trans_handle *trans;
464 struct btrfs_root *root;
465 struct btrfs_inode_item *inode;
475 static int block_iterate_proc(ext2_filsys ext2_fs,
476 u64 disk_block, u64 file_block,
477 struct blk_iterate_data *idata)
482 struct btrfs_root *root = idata->root;
483 struct btrfs_trans_handle *trans = idata->trans;
484 struct btrfs_block_group_cache *cache;
485 u64 bytenr = disk_block * root->sectorsize;
487 sb_region = intersect_with_sb(bytenr, root->sectorsize);
488 do_barrier = sb_region || disk_block >= idata->boundary;
489 if ((idata->num_blocks > 0 && do_barrier) ||
490 (file_block > idata->first_block + idata->num_blocks) ||
491 (disk_block != idata->disk_block + idata->num_blocks)) {
492 if (idata->num_blocks > 0) {
493 ret = record_file_blocks(trans, root, idata->objectid,
494 idata->inode, idata->first_block,
495 idata->disk_block, idata->num_blocks,
499 idata->first_block += idata->num_blocks;
500 idata->num_blocks = 0;
502 if (file_block > idata->first_block) {
503 ret = record_file_blocks(trans, root, idata->objectid,
504 idata->inode, idata->first_block,
505 0, file_block - idata->first_block,
512 bytenr += BTRFS_STRIPE_LEN - 1;
513 bytenr &= ~((u64)BTRFS_STRIPE_LEN - 1);
515 cache = btrfs_lookup_block_group(root->fs_info, bytenr);
517 bytenr = cache->key.objectid + cache->key.offset;
520 idata->first_block = file_block;
521 idata->disk_block = disk_block;
522 idata->boundary = bytenr / root->sectorsize;
527 idata->errcode = ret;
531 static int __block_iterate_proc(ext2_filsys fs, blk_t *blocknr,
532 e2_blkcnt_t blockcnt, blk_t ref_block,
533 int ref_offset, void *priv_data)
535 struct blk_iterate_data *idata;
536 idata = (struct blk_iterate_data *)priv_data;
537 return block_iterate_proc(fs, *blocknr, blockcnt, idata);
541 * traverse file's data blocks, record these data blocks as file extents.
543 static int create_file_extents(struct btrfs_trans_handle *trans,
544 struct btrfs_root *root, u64 objectid,
545 struct btrfs_inode_item *btrfs_inode,
546 ext2_filsys ext2_fs, ext2_ino_t ext2_ino,
547 int datacsum, int packing)
553 u32 sectorsize = root->sectorsize;
554 u64 inode_size = btrfs_stack_inode_size(btrfs_inode);
555 struct blk_iterate_data data = {
558 .inode = btrfs_inode,
559 .objectid = objectid,
564 .checksum = datacsum,
567 err = ext2fs_block_iterate2(ext2_fs, ext2_ino, BLOCK_FLAG_DATA_ONLY,
568 NULL, __block_iterate_proc, &data);
574 if (packing && data.first_block == 0 && data.num_blocks > 0 &&
575 inode_size <= BTRFS_MAX_INLINE_DATA_SIZE(root)) {
576 u64 num_bytes = data.num_blocks * sectorsize;
577 u64 disk_bytenr = data.disk_block * sectorsize;
580 buffer = malloc(num_bytes);
583 ret = read_disk_extent(root, disk_bytenr, num_bytes, buffer);
586 if (num_bytes > inode_size)
587 num_bytes = inode_size;
588 ret = btrfs_insert_inline_extent(trans, root, objectid,
589 0, buffer, num_bytes);
592 nbytes = btrfs_stack_inode_nbytes(btrfs_inode) + num_bytes;
593 btrfs_set_stack_inode_nbytes(btrfs_inode, nbytes);
594 } else if (data.num_blocks > 0) {
595 ret = record_file_blocks(trans, root, objectid, btrfs_inode,
596 data.first_block, data.disk_block,
597 data.num_blocks, data.checksum);
601 data.first_block += data.num_blocks;
602 last_block = (inode_size + sectorsize - 1) / sectorsize;
603 if (last_block > data.first_block) {
604 ret = record_file_blocks(trans, root, objectid, btrfs_inode,
605 data.first_block, 0, last_block -
606 data.first_block, data.checksum);
612 fprintf(stderr, "ext2fs_block_iterate2: %s\n", error_message(err));
616 static int create_symbol_link(struct btrfs_trans_handle *trans,
617 struct btrfs_root *root, u64 objectid,
618 struct btrfs_inode_item *btrfs_inode,
619 ext2_filsys ext2_fs, ext2_ino_t ext2_ino,
620 struct ext2_inode *ext2_inode)
624 u64 inode_size = btrfs_stack_inode_size(btrfs_inode);
625 if (ext2fs_inode_data_blocks(ext2_fs, ext2_inode)) {
626 btrfs_set_stack_inode_size(btrfs_inode, inode_size + 1);
627 ret = create_file_extents(trans, root, objectid, btrfs_inode,
628 ext2_fs, ext2_ino, 1, 1);
629 btrfs_set_stack_inode_size(btrfs_inode, inode_size);
633 pathname = (char *)&(ext2_inode->i_block[0]);
634 BUG_ON(pathname[inode_size] != 0);
635 ret = btrfs_insert_inline_extent(trans, root, objectid, 0,
636 pathname, inode_size + 1);
637 btrfs_set_stack_inode_nbytes(btrfs_inode, inode_size + 1);
642 * Following xattr/acl related codes are based on codes in
643 * fs/ext3/xattr.c and fs/ext3/acl.c
645 #define EXT2_XATTR_BHDR(ptr) ((struct ext2_ext_attr_header *)(ptr))
646 #define EXT2_XATTR_BFIRST(ptr) \
647 ((struct ext2_ext_attr_entry *)(EXT2_XATTR_BHDR(ptr) + 1))
648 #define EXT2_XATTR_IHDR(inode) \
649 ((struct ext2_ext_attr_header *) ((void *)(inode) + \
650 EXT2_GOOD_OLD_INODE_SIZE + (inode)->i_extra_isize))
651 #define EXT2_XATTR_IFIRST(inode) \
652 ((struct ext2_ext_attr_entry *) ((void *)EXT2_XATTR_IHDR(inode) + \
653 sizeof(EXT2_XATTR_IHDR(inode)->h_magic)))
655 static int ext2_xattr_check_names(struct ext2_ext_attr_entry *entry,
658 struct ext2_ext_attr_entry *next;
660 while (!EXT2_EXT_IS_LAST_ENTRY(entry)) {
661 next = EXT2_EXT_ATTR_NEXT(entry);
662 if ((void *)next >= end)
669 static int ext2_xattr_check_block(const char *buf, size_t size)
672 struct ext2_ext_attr_header *header = EXT2_XATTR_BHDR(buf);
674 if (header->h_magic != EXT2_EXT_ATTR_MAGIC ||
675 header->h_blocks != 1)
677 error = ext2_xattr_check_names(EXT2_XATTR_BFIRST(buf), buf + size);
681 static int ext2_xattr_check_entry(struct ext2_ext_attr_entry *entry,
684 size_t value_size = entry->e_value_size;
686 if (entry->e_value_block != 0 || value_size > size ||
687 entry->e_value_offs + value_size > size)
692 #define EXT2_ACL_VERSION 0x0001
694 /* 23.2.5 acl_tag_t values */
696 #define ACL_UNDEFINED_TAG (0x00)
697 #define ACL_USER_OBJ (0x01)
698 #define ACL_USER (0x02)
699 #define ACL_GROUP_OBJ (0x04)
700 #define ACL_GROUP (0x08)
701 #define ACL_MASK (0x10)
702 #define ACL_OTHER (0x20)
704 /* 23.2.7 ACL qualifier constants */
706 #define ACL_UNDEFINED_ID ((id_t)-1)
717 } ext2_acl_entry_short;
723 static inline int ext2_acl_count(size_t size)
726 size -= sizeof(ext2_acl_header);
727 s = size - 4 * sizeof(ext2_acl_entry_short);
729 if (size % sizeof(ext2_acl_entry_short))
731 return size / sizeof(ext2_acl_entry_short);
733 if (s % sizeof(ext2_acl_entry))
735 return s / sizeof(ext2_acl_entry) + 4;
739 #define ACL_EA_VERSION 0x0002
749 acl_ea_entry a_entries[0];
752 static inline size_t acl_ea_size(int count)
754 return sizeof(acl_ea_header) + count * sizeof(acl_ea_entry);
757 static int ext2_acl_to_xattr(void *dst, const void *src,
758 size_t dst_size, size_t src_size)
761 const void *end = src + src_size;
762 acl_ea_header *ext_acl = (acl_ea_header *)dst;
763 acl_ea_entry *dst_entry = ext_acl->a_entries;
764 ext2_acl_entry *src_entry;
766 if (src_size < sizeof(ext2_acl_header))
768 if (((ext2_acl_header *)src)->a_version !=
769 cpu_to_le32(EXT2_ACL_VERSION))
771 src += sizeof(ext2_acl_header);
772 count = ext2_acl_count(src_size);
776 BUG_ON(dst_size < acl_ea_size(count));
777 ext_acl->a_version = cpu_to_le32(ACL_EA_VERSION);
778 for (i = 0; i < count; i++, dst_entry++) {
779 src_entry = (ext2_acl_entry *)src;
780 if (src + sizeof(ext2_acl_entry_short) > end)
782 dst_entry->e_tag = src_entry->e_tag;
783 dst_entry->e_perm = src_entry->e_perm;
784 switch (le16_to_cpu(src_entry->e_tag)) {
789 src += sizeof(ext2_acl_entry_short);
790 dst_entry->e_id = cpu_to_le32(ACL_UNDEFINED_ID);
794 src += sizeof(ext2_acl_entry);
797 dst_entry->e_id = src_entry->e_id;
810 static char *xattr_prefix_table[] = {
812 [2] = "system.posix_acl_access",
813 [3] = "system.posix_acl_default",
818 static int copy_single_xattr(struct btrfs_trans_handle *trans,
819 struct btrfs_root *root, u64 objectid,
820 struct ext2_ext_attr_entry *entry,
821 const void *data, u32 datalen)
826 void *databuf = NULL;
827 char namebuf[XATTR_NAME_MAX + 1];
829 name_index = entry->e_name_index;
830 if (name_index >= ARRAY_SIZE(xattr_prefix_table) ||
831 xattr_prefix_table[name_index] == NULL)
833 name_len = strlen(xattr_prefix_table[name_index]) +
835 if (name_len >= sizeof(namebuf))
838 if (name_index == 2 || name_index == 3) {
839 size_t bufsize = acl_ea_size(ext2_acl_count(datalen));
840 databuf = malloc(bufsize);
843 ret = ext2_acl_to_xattr(databuf, data, bufsize, datalen);
849 strncpy(namebuf, xattr_prefix_table[name_index], XATTR_NAME_MAX);
850 strncat(namebuf, EXT2_EXT_ATTR_NAME(entry), entry->e_name_len);
851 if (name_len + datalen > BTRFS_LEAF_DATA_SIZE(root) -
852 sizeof(struct btrfs_item) - sizeof(struct btrfs_dir_item)) {
853 fprintf(stderr, "skip large xattr on inode %Lu name %.*s\n",
854 objectid - INO_OFFSET, name_len, namebuf);
857 ret = btrfs_insert_xattr_item(trans, root, namebuf, name_len,
858 data, datalen, objectid);
864 static int copy_extended_attrs(struct btrfs_trans_handle *trans,
865 struct btrfs_root *root, u64 objectid,
866 struct btrfs_inode_item *btrfs_inode,
867 ext2_filsys ext2_fs, ext2_ino_t ext2_ino)
873 u32 block_size = ext2_fs->blocksize;
874 u32 inode_size = EXT2_INODE_SIZE(ext2_fs->super);
875 struct ext2_inode_large *ext2_inode;
876 struct ext2_ext_attr_entry *entry;
879 char inode_buf[EXT2_GOOD_OLD_INODE_SIZE];
881 if (inode_size <= EXT2_GOOD_OLD_INODE_SIZE) {
882 ext2_inode = (struct ext2_inode_large *)inode_buf;
884 ext2_inode = (struct ext2_inode_large *)malloc(inode_size);
888 err = ext2fs_read_inode_full(ext2_fs, ext2_ino, (void *)ext2_inode,
891 fprintf(stderr, "ext2fs_read_inode_full: %s\n",
897 if (ext2_ino > ext2_fs->super->s_first_ino &&
898 inode_size > EXT2_GOOD_OLD_INODE_SIZE) {
899 if (EXT2_GOOD_OLD_INODE_SIZE +
900 ext2_inode->i_extra_isize > inode_size) {
904 if (ext2_inode->i_extra_isize != 0 &&
905 EXT2_XATTR_IHDR(ext2_inode)->h_magic ==
906 EXT2_EXT_ATTR_MAGIC) {
912 void *end = (void *)ext2_inode + inode_size;
913 entry = EXT2_XATTR_IFIRST(ext2_inode);
914 total = end - (void *)entry;
915 ret = ext2_xattr_check_names(entry, end);
918 while (!EXT2_EXT_IS_LAST_ENTRY(entry)) {
919 ret = ext2_xattr_check_entry(entry, total);
922 data = (void *)EXT2_XATTR_IFIRST(ext2_inode) +
924 datalen = entry->e_value_size;
925 ret = copy_single_xattr(trans, root, objectid,
926 entry, data, datalen);
929 entry = EXT2_EXT_ATTR_NEXT(entry);
933 if (ext2_inode->i_file_acl == 0)
936 buffer = malloc(block_size);
941 err = ext2fs_read_ext_attr(ext2_fs, ext2_inode->i_file_acl, buffer);
943 fprintf(stderr, "ext2fs_read_ext_attr: %s\n",
948 ret = ext2_xattr_check_block(buffer, block_size);
952 entry = EXT2_XATTR_BFIRST(buffer);
953 while (!EXT2_EXT_IS_LAST_ENTRY(entry)) {
954 ret = ext2_xattr_check_entry(entry, block_size);
957 data = buffer + entry->e_value_offs;
958 datalen = entry->e_value_size;
959 ret = copy_single_xattr(trans, root, objectid,
960 entry, data, datalen);
963 entry = EXT2_EXT_ATTR_NEXT(entry);
967 if ((void *)ext2_inode != inode_buf)
972 #define MKDEV(ma, mi) (((ma) << MINORBITS) | (mi))
974 static inline dev_t old_decode_dev(u16 val)
976 return MKDEV((val >> 8) & 255, val & 255);
979 static inline dev_t new_decode_dev(u32 dev)
981 unsigned major = (dev & 0xfff00) >> 8;
982 unsigned minor = (dev & 0xff) | ((dev >> 12) & 0xfff00);
983 return MKDEV(major, minor);
986 static int copy_inode_item(struct btrfs_inode_item *dst,
987 struct ext2_inode *src, u32 blocksize)
989 btrfs_set_stack_inode_generation(dst, 1);
990 btrfs_set_stack_inode_size(dst, src->i_size);
991 btrfs_set_stack_inode_nbytes(dst, 0);
992 btrfs_set_stack_inode_block_group(dst, 0);
993 btrfs_set_stack_inode_nlink(dst, src->i_links_count);
994 btrfs_set_stack_inode_uid(dst, src->i_uid | (src->i_uid_high << 16));
995 btrfs_set_stack_inode_gid(dst, src->i_gid | (src->i_gid_high << 16));
996 btrfs_set_stack_inode_mode(dst, src->i_mode);
997 btrfs_set_stack_inode_rdev(dst, 0);
998 btrfs_set_stack_inode_flags(dst, 0);
999 btrfs_set_stack_timespec_sec(&dst->atime, src->i_atime);
1000 btrfs_set_stack_timespec_nsec(&dst->atime, 0);
1001 btrfs_set_stack_timespec_sec(&dst->ctime, src->i_ctime);
1002 btrfs_set_stack_timespec_nsec(&dst->ctime, 0);
1003 btrfs_set_stack_timespec_sec(&dst->mtime, src->i_mtime);
1004 btrfs_set_stack_timespec_nsec(&dst->mtime, 0);
1005 btrfs_set_stack_timespec_sec(&dst->otime, 0);
1006 btrfs_set_stack_timespec_nsec(&dst->otime, 0);
1008 if (S_ISDIR(src->i_mode)) {
1009 btrfs_set_stack_inode_size(dst, 0);
1010 btrfs_set_stack_inode_nlink(dst, 1);
1012 if (S_ISREG(src->i_mode)) {
1013 btrfs_set_stack_inode_size(dst, (u64)src->i_size_high << 32 |
1016 if (!S_ISREG(src->i_mode) && !S_ISDIR(src->i_mode) &&
1017 !S_ISLNK(src->i_mode)) {
1018 if (src->i_block[0]) {
1019 btrfs_set_stack_inode_rdev(dst,
1020 old_decode_dev(src->i_block[0]));
1022 btrfs_set_stack_inode_rdev(dst,
1023 new_decode_dev(src->i_block[1]));
1030 * copy a single inode. do all the required works, such as cloning
1031 * inode item, creating file extents and creating directory entries.
1033 static int copy_single_inode(struct btrfs_trans_handle *trans,
1034 struct btrfs_root *root, u64 objectid,
1035 ext2_filsys ext2_fs, ext2_ino_t ext2_ino,
1036 struct ext2_inode *ext2_inode,
1037 int datacsum, int packing, int noxattr)
1040 struct btrfs_key inode_key;
1041 struct btrfs_inode_item btrfs_inode;
1043 if (ext2_inode->i_links_count == 0)
1046 copy_inode_item(&btrfs_inode, ext2_inode, ext2_fs->blocksize);
1047 if (!datacsum && S_ISREG(ext2_inode->i_mode)) {
1048 u32 flags = btrfs_stack_inode_flags(&btrfs_inode) |
1049 BTRFS_INODE_NODATASUM;
1050 btrfs_set_stack_inode_flags(&btrfs_inode, flags);
1053 switch (ext2_inode->i_mode & S_IFMT) {
1055 ret = create_file_extents(trans, root, objectid, &btrfs_inode,
1056 ext2_fs, ext2_ino, datacsum, packing);
1059 ret = create_dir_entries(trans, root, objectid, &btrfs_inode,
1063 ret = create_symbol_link(trans, root, objectid, &btrfs_inode,
1064 ext2_fs, ext2_ino, ext2_inode);
1074 ret = copy_extended_attrs(trans, root, objectid, &btrfs_inode,
1079 inode_key.objectid = objectid;
1080 inode_key.offset = 0;
1081 btrfs_set_key_type(&inode_key, BTRFS_INODE_ITEM_KEY);
1082 ret = btrfs_insert_inode(trans, root, objectid, &btrfs_inode);
1086 static int copy_disk_extent(struct btrfs_root *root, u64 dst_bytenr,
1087 u64 src_bytenr, u32 num_bytes)
1091 struct btrfs_fs_devices *fs_devs = root->fs_info->fs_devices;
1093 buffer = malloc(num_bytes);
1096 ret = pread(fs_devs->latest_bdev, buffer, num_bytes, src_bytenr);
1097 if (ret != num_bytes)
1099 ret = pwrite(fs_devs->latest_bdev, buffer, num_bytes, dst_bytenr);
1100 if (ret != num_bytes)
1110 * scan ext2's inode bitmap and copy all used inodes.
1112 static int copy_inodes(struct btrfs_root *root, ext2_filsys ext2_fs,
1113 int datacsum, int packing, int noxattr, struct task_ctx *p)
1117 ext2_inode_scan ext2_scan;
1118 struct ext2_inode ext2_inode;
1119 ext2_ino_t ext2_ino;
1121 struct btrfs_trans_handle *trans;
1123 trans = btrfs_start_transaction(root, 1);
1126 err = ext2fs_open_inode_scan(ext2_fs, 0, &ext2_scan);
1128 fprintf(stderr, "ext2fs_open_inode_scan: %s\n", error_message(err));
1131 while (!(err = ext2fs_get_next_inode(ext2_scan, &ext2_ino,
1133 /* no more inodes */
1136 /* skip special inode in ext2fs */
1137 if (ext2_ino < EXT2_GOOD_OLD_FIRST_INO &&
1138 ext2_ino != EXT2_ROOT_INO)
1140 objectid = ext2_ino + INO_OFFSET;
1141 ret = copy_single_inode(trans, root,
1142 objectid, ext2_fs, ext2_ino,
1143 &ext2_inode, datacsum, packing,
1145 p->cur_copy_inodes++;
1148 if (trans->blocks_used >= 4096) {
1149 ret = btrfs_commit_transaction(trans, root);
1151 trans = btrfs_start_transaction(root, 1);
1156 fprintf(stderr, "ext2fs_get_next_inode: %s\n", error_message(err));
1159 ret = btrfs_commit_transaction(trans, root);
1166 * Construct a range of ext2fs image file.
1167 * scan block allocation bitmap, find all blocks used by the ext2fs
1168 * in this range and create file extents that point to these blocks.
1170 * Note: Before calling the function, no file extent points to blocks
1173 static int create_image_file_range(struct btrfs_trans_handle *trans,
1174 struct btrfs_root *root, u64 objectid,
1175 struct btrfs_inode_item *inode,
1176 u64 start_byte, u64 end_byte,
1177 ext2_filsys ext2_fs, int datacsum)
1179 u32 blocksize = ext2_fs->blocksize;
1180 u32 block = start_byte / blocksize;
1181 u32 last_block = (end_byte + blocksize - 1) / blocksize;
1183 struct blk_iterate_data data = {
1187 .objectid = objectid,
1188 .first_block = block,
1191 .boundary = (u64)-1,
1192 .checksum = datacsum,
1195 for (; start_byte < end_byte; block++, start_byte += blocksize) {
1196 if (!ext2fs_fast_test_block_bitmap(ext2_fs->block_map, block))
1198 ret = block_iterate_proc(NULL, block, block, &data);
1199 if (ret & BLOCK_ABORT) {
1204 if (data.num_blocks > 0) {
1205 ret = record_file_blocks(trans, root, objectid, inode,
1206 data.first_block, data.disk_block,
1207 data.num_blocks, datacsum);
1210 data.first_block += data.num_blocks;
1212 if (last_block > data.first_block) {
1213 ret = record_file_blocks(trans, root, objectid, inode,
1214 data.first_block, 0, last_block -
1215 data.first_block, datacsum);
1223 * Create the ext2fs image file.
1225 static int create_ext2_image(struct btrfs_root *root, ext2_filsys ext2_fs,
1226 const char *name, int datacsum)
1229 struct btrfs_key key;
1230 struct btrfs_key location;
1231 struct btrfs_path path;
1232 struct btrfs_inode_item btrfs_inode;
1233 struct btrfs_inode_item *inode_item;
1234 struct extent_buffer *leaf;
1235 struct btrfs_fs_info *fs_info = root->fs_info;
1236 struct btrfs_root *extent_root = fs_info->extent_root;
1237 struct btrfs_trans_handle *trans;
1238 struct btrfs_extent_item *ei;
1239 struct btrfs_extent_inline_ref *iref;
1240 struct btrfs_extent_data_ref *dref;
1247 u64 flags = BTRFS_INODE_READONLY;
1248 u32 sectorsize = root->sectorsize;
1250 total_bytes = btrfs_super_total_bytes(fs_info->super_copy);
1251 first_free = BTRFS_SUPER_INFO_OFFSET + sectorsize * 2 - 1;
1252 first_free &= ~((u64)sectorsize - 1);
1254 flags |= BTRFS_INODE_NODATASUM;
1256 memset(&btrfs_inode, 0, sizeof(btrfs_inode));
1257 btrfs_set_stack_inode_generation(&btrfs_inode, 1);
1258 btrfs_set_stack_inode_size(&btrfs_inode, total_bytes);
1259 btrfs_set_stack_inode_nlink(&btrfs_inode, 1);
1260 btrfs_set_stack_inode_nbytes(&btrfs_inode, 0);
1261 btrfs_set_stack_inode_mode(&btrfs_inode, S_IFREG | 0400);
1262 btrfs_set_stack_inode_flags(&btrfs_inode, flags);
1263 btrfs_init_path(&path);
1264 trans = btrfs_start_transaction(root, 1);
1267 objectid = btrfs_root_dirid(&root->root_item);
1268 ret = btrfs_find_free_objectid(trans, root, objectid, &objectid);
1273 * copy blocks covered by extent #0 to new positions. extent #0 is
1274 * special, we can't rely on relocate_extents_range to relocate it.
1276 for (last_byte = 0; last_byte < first_free; last_byte += sectorsize) {
1277 ret = custom_alloc_extent(root, sectorsize, 0, &key);
1280 ret = copy_disk_extent(root, key.objectid, last_byte,
1284 ret = btrfs_record_file_extent(trans, root, objectid,
1285 &btrfs_inode, last_byte,
1286 key.objectid, sectorsize);
1290 ret = csum_disk_extent(trans, root, key.objectid,
1298 key.objectid = last_byte;
1300 btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY);
1301 ret = btrfs_search_slot(trans, fs_info->extent_root,
1306 leaf = path.nodes[0];
1307 if (path.slots[0] >= btrfs_header_nritems(leaf)) {
1308 ret = btrfs_next_leaf(extent_root, &path);
1313 leaf = path.nodes[0];
1315 btrfs_item_key_to_cpu(leaf, &key, path.slots[0]);
1316 if (last_byte > key.objectid ||
1317 key.type != BTRFS_EXTENT_ITEM_KEY) {
1322 bytenr = key.objectid;
1323 num_bytes = key.offset;
1324 ei = btrfs_item_ptr(leaf, path.slots[0],
1325 struct btrfs_extent_item);
1326 if (!(btrfs_extent_flags(leaf, ei) & BTRFS_EXTENT_FLAG_DATA)) {
1331 BUG_ON(btrfs_item_size_nr(leaf, path.slots[0]) != sizeof(*ei) +
1332 btrfs_extent_inline_ref_size(BTRFS_EXTENT_DATA_REF_KEY));
1334 iref = (struct btrfs_extent_inline_ref *)(ei + 1);
1335 key.type = btrfs_extent_inline_ref_type(leaf, iref);
1336 BUG_ON(key.type != BTRFS_EXTENT_DATA_REF_KEY);
1337 dref = (struct btrfs_extent_data_ref *)(&iref->offset);
1338 if (btrfs_extent_data_ref_root(leaf, dref) !=
1339 BTRFS_FS_TREE_OBJECTID) {
1344 if (bytenr > last_byte) {
1345 ret = create_image_file_range(trans, root, objectid,
1346 &btrfs_inode, last_byte,
1352 ret = btrfs_record_file_extent(trans, root, objectid,
1353 &btrfs_inode, bytenr, bytenr,
1357 last_byte = bytenr + num_bytes;
1358 btrfs_release_path(&path);
1360 if (trans->blocks_used >= 4096) {
1361 ret = btrfs_commit_transaction(trans, root);
1363 trans = btrfs_start_transaction(root, 1);
1367 btrfs_release_path(&path);
1368 if (total_bytes > last_byte) {
1369 ret = create_image_file_range(trans, root, objectid,
1370 &btrfs_inode, last_byte,
1371 total_bytes, ext2_fs,
1377 ret = btrfs_insert_inode(trans, root, objectid, &btrfs_inode);
1381 location.objectid = objectid;
1382 location.offset = 0;
1383 btrfs_set_key_type(&location, BTRFS_INODE_ITEM_KEY);
1384 ret = btrfs_insert_dir_item(trans, root, name, strlen(name),
1385 btrfs_root_dirid(&root->root_item),
1386 &location, EXT2_FT_REG_FILE, objectid);
1389 ret = btrfs_insert_inode_ref(trans, root, name, strlen(name),
1391 btrfs_root_dirid(&root->root_item),
1395 location.objectid = btrfs_root_dirid(&root->root_item);
1396 location.offset = 0;
1397 btrfs_set_key_type(&location, BTRFS_INODE_ITEM_KEY);
1398 ret = btrfs_lookup_inode(trans, root, &path, &location, 1);
1401 leaf = path.nodes[0];
1402 inode_item = btrfs_item_ptr(leaf, path.slots[0],
1403 struct btrfs_inode_item);
1404 btrfs_set_inode_size(leaf, inode_item, strlen(name) * 2 +
1405 btrfs_inode_size(leaf, inode_item));
1406 btrfs_mark_buffer_dirty(leaf);
1407 btrfs_release_path(&path);
1408 ret = btrfs_commit_transaction(trans, root);
1411 btrfs_release_path(&path);
1415 static struct btrfs_root * link_subvol(struct btrfs_root *root,
1416 const char *base, u64 root_objectid)
1418 struct btrfs_trans_handle *trans;
1419 struct btrfs_fs_info *fs_info = root->fs_info;
1420 struct btrfs_root *tree_root = fs_info->tree_root;
1421 struct btrfs_root *new_root = NULL;
1422 struct btrfs_path *path;
1423 struct btrfs_inode_item *inode_item;
1424 struct extent_buffer *leaf;
1425 struct btrfs_key key;
1426 u64 dirid = btrfs_root_dirid(&root->root_item);
1428 char buf[BTRFS_NAME_LEN + 1]; /* for snprintf null */
1434 if (len < 1 || len > BTRFS_NAME_LEN)
1437 path = btrfs_alloc_path();
1440 key.objectid = dirid;
1441 key.type = BTRFS_DIR_INDEX_KEY;
1442 key.offset = (u64)-1;
1444 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1447 if (path->slots[0] > 0) {
1449 btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
1450 if (key.objectid == dirid && key.type == BTRFS_DIR_INDEX_KEY)
1451 index = key.offset + 1;
1453 btrfs_release_path(path);
1455 trans = btrfs_start_transaction(root, 1);
1458 key.objectid = dirid;
1460 key.type = BTRFS_INODE_ITEM_KEY;
1462 ret = btrfs_lookup_inode(trans, root, path, &key, 1);
1464 leaf = path->nodes[0];
1465 inode_item = btrfs_item_ptr(leaf, path->slots[0],
1466 struct btrfs_inode_item);
1468 key.objectid = root_objectid;
1469 key.offset = (u64)-1;
1470 key.type = BTRFS_ROOT_ITEM_KEY;
1472 memcpy(buf, base, len);
1473 for (i = 0; i < 1024; i++) {
1474 ret = btrfs_insert_dir_item(trans, root, buf, len,
1475 dirid, &key, BTRFS_FT_DIR, index);
1478 len = snprintf(buf, ARRAY_SIZE(buf), "%s%d", base, i);
1479 if (len < 1 || len > BTRFS_NAME_LEN) {
1487 btrfs_set_inode_size(leaf, inode_item, len * 2 +
1488 btrfs_inode_size(leaf, inode_item));
1489 btrfs_mark_buffer_dirty(leaf);
1490 btrfs_release_path(path);
1492 /* add the backref first */
1493 ret = btrfs_add_root_ref(trans, tree_root, root_objectid,
1494 BTRFS_ROOT_BACKREF_KEY,
1495 root->root_key.objectid,
1496 dirid, index, buf, len);
1499 /* now add the forward ref */
1500 ret = btrfs_add_root_ref(trans, tree_root, root->root_key.objectid,
1501 BTRFS_ROOT_REF_KEY, root_objectid,
1502 dirid, index, buf, len);
1504 ret = btrfs_commit_transaction(trans, root);
1507 new_root = btrfs_read_fs_root(fs_info, &key);
1508 if (IS_ERR(new_root))
1511 btrfs_free_path(path);
1515 static int create_chunk_mapping(struct btrfs_trans_handle *trans,
1516 struct btrfs_root *root)
1518 struct btrfs_fs_info *info = root->fs_info;
1519 struct btrfs_root *chunk_root = info->chunk_root;
1520 struct btrfs_root *extent_root = info->extent_root;
1521 struct btrfs_device *device;
1522 struct btrfs_block_group_cache *cache;
1523 struct btrfs_dev_extent *extent;
1524 struct extent_buffer *leaf;
1525 struct btrfs_chunk chunk;
1526 struct btrfs_key key;
1527 struct btrfs_path path;
1533 btrfs_init_path(&path);
1535 total_bytes = btrfs_super_total_bytes(root->fs_info->super_copy);
1536 chunk_objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID;
1538 BUG_ON(list_empty(&info->fs_devices->devices));
1539 device = list_entry(info->fs_devices->devices.next,
1540 struct btrfs_device, dev_list);
1541 BUG_ON(device->devid != info->fs_devices->latest_devid);
1543 /* delete device extent created by make_btrfs */
1544 key.objectid = device->devid;
1546 key.type = BTRFS_DEV_EXTENT_KEY;
1547 ret = btrfs_search_slot(trans, device->dev_root, &key, &path, -1, 1);
1552 ret = btrfs_del_item(trans, device->dev_root, &path);
1555 btrfs_release_path(&path);
1557 /* delete chunk item created by make_btrfs */
1558 key.objectid = chunk_objectid;
1560 key.type = BTRFS_CHUNK_ITEM_KEY;
1561 ret = btrfs_search_slot(trans, chunk_root, &key, &path, -1, 1);
1566 ret = btrfs_del_item(trans, chunk_root, &path);
1569 btrfs_release_path(&path);
1571 /* for each block group, create device extent and chunk item */
1573 while (cur_start < total_bytes) {
1574 cache = btrfs_lookup_block_group(root->fs_info, cur_start);
1577 /* insert device extent */
1578 key.objectid = device->devid;
1579 key.offset = cache->key.objectid;
1580 key.type = BTRFS_DEV_EXTENT_KEY;
1581 ret = btrfs_insert_empty_item(trans, device->dev_root, &path,
1582 &key, sizeof(*extent));
1586 leaf = path.nodes[0];
1587 extent = btrfs_item_ptr(leaf, path.slots[0],
1588 struct btrfs_dev_extent);
1590 btrfs_set_dev_extent_chunk_tree(leaf, extent,
1591 chunk_root->root_key.objectid);
1592 btrfs_set_dev_extent_chunk_objectid(leaf, extent,
1594 btrfs_set_dev_extent_chunk_offset(leaf, extent,
1595 cache->key.objectid);
1596 btrfs_set_dev_extent_length(leaf, extent, cache->key.offset);
1597 write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid,
1598 (unsigned long)btrfs_dev_extent_chunk_tree_uuid(extent),
1600 btrfs_mark_buffer_dirty(leaf);
1601 btrfs_release_path(&path);
1603 /* insert chunk item */
1604 btrfs_set_stack_chunk_length(&chunk, cache->key.offset);
1605 btrfs_set_stack_chunk_owner(&chunk,
1606 extent_root->root_key.objectid);
1607 btrfs_set_stack_chunk_stripe_len(&chunk, BTRFS_STRIPE_LEN);
1608 btrfs_set_stack_chunk_type(&chunk, cache->flags);
1609 btrfs_set_stack_chunk_io_align(&chunk, device->io_align);
1610 btrfs_set_stack_chunk_io_width(&chunk, device->io_width);
1611 btrfs_set_stack_chunk_sector_size(&chunk, device->sector_size);
1612 btrfs_set_stack_chunk_num_stripes(&chunk, 1);
1613 btrfs_set_stack_chunk_sub_stripes(&chunk, 0);
1614 btrfs_set_stack_stripe_devid(&chunk.stripe, device->devid);
1615 btrfs_set_stack_stripe_offset(&chunk.stripe,
1616 cache->key.objectid);
1617 memcpy(&chunk.stripe.dev_uuid, device->uuid, BTRFS_UUID_SIZE);
1619 key.objectid = chunk_objectid;
1620 key.offset = cache->key.objectid;
1621 key.type = BTRFS_CHUNK_ITEM_KEY;
1623 ret = btrfs_insert_item(trans, chunk_root, &key, &chunk,
1624 btrfs_chunk_item_size(1));
1628 cur_start = cache->key.objectid + cache->key.offset;
1631 device->bytes_used = total_bytes;
1632 ret = btrfs_update_device(trans, device);
1634 btrfs_release_path(&path);
1638 static int create_subvol(struct btrfs_trans_handle *trans,
1639 struct btrfs_root *root, u64 root_objectid)
1641 struct extent_buffer *tmp;
1642 struct btrfs_root *new_root;
1643 struct btrfs_key key;
1644 struct btrfs_root_item root_item;
1647 ret = btrfs_copy_root(trans, root, root->node, &tmp,
1651 memcpy(&root_item, &root->root_item, sizeof(root_item));
1652 btrfs_set_root_bytenr(&root_item, tmp->start);
1653 btrfs_set_root_level(&root_item, btrfs_header_level(tmp));
1654 btrfs_set_root_generation(&root_item, trans->transid);
1655 free_extent_buffer(tmp);
1657 key.objectid = root_objectid;
1658 key.type = BTRFS_ROOT_ITEM_KEY;
1659 key.offset = trans->transid;
1660 ret = btrfs_insert_root(trans, root->fs_info->tree_root,
1663 key.offset = (u64)-1;
1664 new_root = btrfs_read_fs_root(root->fs_info, &key);
1665 BUG_ON(!new_root || IS_ERR(new_root));
1667 ret = btrfs_make_root_dir(trans, new_root, BTRFS_FIRST_FREE_OBJECTID);
1673 static int init_btrfs(struct btrfs_root *root)
1676 struct btrfs_key location;
1677 struct btrfs_trans_handle *trans;
1678 struct btrfs_fs_info *fs_info = root->fs_info;
1679 struct extent_buffer *tmp;
1681 trans = btrfs_start_transaction(root, 1);
1683 ret = btrfs_make_block_groups(trans, root);
1686 ret = btrfs_fix_block_accounting(trans, root);
1689 ret = create_chunk_mapping(trans, root);
1692 ret = btrfs_make_root_dir(trans, fs_info->tree_root,
1693 BTRFS_ROOT_TREE_DIR_OBJECTID);
1696 memcpy(&location, &root->root_key, sizeof(location));
1697 location.offset = (u64)-1;
1698 ret = btrfs_insert_dir_item(trans, fs_info->tree_root, "default", 7,
1699 btrfs_super_root_dir(fs_info->super_copy),
1700 &location, BTRFS_FT_DIR, 0);
1703 ret = btrfs_insert_inode_ref(trans, fs_info->tree_root, "default", 7,
1705 btrfs_super_root_dir(fs_info->super_copy), 0);
1708 btrfs_set_root_dirid(&fs_info->fs_root->root_item,
1709 BTRFS_FIRST_FREE_OBJECTID);
1711 /* subvol for ext2 image file */
1712 ret = create_subvol(trans, root, EXT2_IMAGE_SUBVOL_OBJECTID);
1714 /* subvol for data relocation */
1715 ret = create_subvol(trans, root, BTRFS_DATA_RELOC_TREE_OBJECTID);
1718 extent_buffer_get(fs_info->csum_root->node);
1719 ret = __btrfs_cow_block(trans, fs_info->csum_root,
1720 fs_info->csum_root->node, NULL, 0, &tmp, 0, 0);
1722 free_extent_buffer(tmp);
1724 ret = btrfs_commit_transaction(trans, root);
1731 * Migrate super block to its default position and zero 0 ~ 16k
1733 static int migrate_super_block(int fd, u64 old_bytenr, u32 sectorsize)
1736 struct extent_buffer *buf;
1737 struct btrfs_super_block *super;
1741 BUG_ON(sectorsize < sizeof(*super));
1742 buf = malloc(sizeof(*buf) + sectorsize);
1746 buf->len = sectorsize;
1747 ret = pread(fd, buf->data, sectorsize, old_bytenr);
1748 if (ret != sectorsize)
1751 super = (struct btrfs_super_block *)buf->data;
1752 BUG_ON(btrfs_super_bytenr(super) != old_bytenr);
1753 btrfs_set_super_bytenr(super, BTRFS_SUPER_INFO_OFFSET);
1755 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
1756 ret = pwrite(fd, buf->data, sectorsize, BTRFS_SUPER_INFO_OFFSET);
1757 if (ret != sectorsize)
1764 memset(buf->data, 0, sectorsize);
1765 for (bytenr = 0; bytenr < BTRFS_SUPER_INFO_OFFSET; ) {
1766 len = BTRFS_SUPER_INFO_OFFSET - bytenr;
1767 if (len > sectorsize)
1769 ret = pwrite(fd, buf->data, len, bytenr);
1771 fprintf(stderr, "unable to zero fill device\n");
1785 static int prepare_system_chunk_sb(struct btrfs_super_block *super)
1787 struct btrfs_chunk *chunk;
1788 struct btrfs_disk_key *key;
1789 u32 sectorsize = btrfs_super_sectorsize(super);
1791 key = (struct btrfs_disk_key *)(super->sys_chunk_array);
1792 chunk = (struct btrfs_chunk *)(super->sys_chunk_array +
1793 sizeof(struct btrfs_disk_key));
1795 btrfs_set_disk_key_objectid(key, BTRFS_FIRST_CHUNK_TREE_OBJECTID);
1796 btrfs_set_disk_key_type(key, BTRFS_CHUNK_ITEM_KEY);
1797 btrfs_set_disk_key_offset(key, 0);
1799 btrfs_set_stack_chunk_length(chunk, btrfs_super_total_bytes(super));
1800 btrfs_set_stack_chunk_owner(chunk, BTRFS_EXTENT_TREE_OBJECTID);
1801 btrfs_set_stack_chunk_stripe_len(chunk, BTRFS_STRIPE_LEN);
1802 btrfs_set_stack_chunk_type(chunk, BTRFS_BLOCK_GROUP_SYSTEM);
1803 btrfs_set_stack_chunk_io_align(chunk, sectorsize);
1804 btrfs_set_stack_chunk_io_width(chunk, sectorsize);
1805 btrfs_set_stack_chunk_sector_size(chunk, sectorsize);
1806 btrfs_set_stack_chunk_num_stripes(chunk, 1);
1807 btrfs_set_stack_chunk_sub_stripes(chunk, 0);
1808 chunk->stripe.devid = super->dev_item.devid;
1809 btrfs_set_stack_stripe_offset(&chunk->stripe, 0);
1810 memcpy(chunk->stripe.dev_uuid, super->dev_item.uuid, BTRFS_UUID_SIZE);
1811 btrfs_set_super_sys_array_size(super, sizeof(*key) + sizeof(*chunk));
1815 static int prepare_system_chunk(int fd, u64 sb_bytenr)
1818 struct extent_buffer *buf;
1819 struct btrfs_super_block *super;
1821 BUG_ON(BTRFS_SUPER_INFO_SIZE < sizeof(*super));
1822 buf = malloc(sizeof(*buf) + BTRFS_SUPER_INFO_SIZE);
1826 buf->len = BTRFS_SUPER_INFO_SIZE;
1827 ret = pread(fd, buf->data, BTRFS_SUPER_INFO_SIZE, sb_bytenr);
1828 if (ret != BTRFS_SUPER_INFO_SIZE)
1831 super = (struct btrfs_super_block *)buf->data;
1832 BUG_ON(btrfs_super_bytenr(super) != sb_bytenr);
1833 BUG_ON(btrfs_super_num_devices(super) != 1);
1835 ret = prepare_system_chunk_sb(super);
1839 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
1840 ret = pwrite(fd, buf->data, BTRFS_SUPER_INFO_SIZE, sb_bytenr);
1841 if (ret != BTRFS_SUPER_INFO_SIZE)
1852 static int relocate_one_reference(struct btrfs_trans_handle *trans,
1853 struct btrfs_root *root,
1854 u64 extent_start, u64 extent_size,
1855 struct btrfs_key *extent_key,
1856 struct extent_io_tree *reloc_tree)
1858 struct extent_buffer *leaf;
1859 struct btrfs_file_extent_item *fi;
1860 struct btrfs_key key;
1861 struct btrfs_path path;
1862 struct btrfs_inode_item inode;
1863 struct blk_iterate_data data;
1870 u32 sectorsize = root->sectorsize;
1876 btrfs_init_path(&path);
1877 ret = btrfs_search_slot(trans, root, extent_key, &path, -1, 1);
1881 leaf = path.nodes[0];
1882 fi = btrfs_item_ptr(leaf, path.slots[0],
1883 struct btrfs_file_extent_item);
1884 BUG_ON(btrfs_file_extent_offset(leaf, fi) > 0);
1885 if (extent_start != btrfs_file_extent_disk_bytenr(leaf, fi) ||
1886 extent_size != btrfs_file_extent_disk_num_bytes(leaf, fi)) {
1891 bytenr = extent_start + btrfs_file_extent_offset(leaf, fi);
1892 num_bytes = btrfs_file_extent_num_bytes(leaf, fi);
1894 ret = btrfs_del_item(trans, root, &path);
1898 ret = btrfs_free_extent(trans, root, extent_start, extent_size, 0,
1899 root->root_key.objectid,
1900 extent_key->objectid, extent_key->offset);
1904 btrfs_release_path(&path);
1906 key.objectid = extent_key->objectid;
1908 key.type = BTRFS_INODE_ITEM_KEY;
1909 ret = btrfs_lookup_inode(trans, root, &path, &key, 0);
1913 leaf = path.nodes[0];
1914 ptr = btrfs_item_ptr_offset(leaf, path.slots[0]);
1915 read_extent_buffer(leaf, &inode, ptr, sizeof(inode));
1916 btrfs_release_path(&path);
1918 BUG_ON(num_bytes & (sectorsize - 1));
1919 nbytes = btrfs_stack_inode_nbytes(&inode) - num_bytes;
1920 btrfs_set_stack_inode_nbytes(&inode, nbytes);
1921 datacsum = !(btrfs_stack_inode_flags(&inode) & BTRFS_INODE_NODATASUM);
1923 data = (struct blk_iterate_data) {
1927 .objectid = extent_key->objectid,
1928 .first_block = extent_key->offset / sectorsize,
1931 .boundary = (u64)-1,
1932 .checksum = datacsum,
1936 cur_offset = extent_key->offset;
1937 while (num_bytes > 0) {
1938 sector_end = bytenr + sectorsize - 1;
1939 if (test_range_bit(reloc_tree, bytenr, sector_end,
1940 EXTENT_LOCKED, 1)) {
1941 ret = get_state_private(reloc_tree, bytenr, &new_pos);
1944 ret = custom_alloc_extent(root, sectorsize, 0, &key);
1947 new_pos = key.objectid;
1949 if (cur_offset == extent_key->offset) {
1950 fd = root->fs_info->fs_devices->latest_bdev;
1951 readahead(fd, bytenr, num_bytes);
1953 ret = copy_disk_extent(root, new_pos, bytenr,
1957 ret = set_extent_bits(reloc_tree, bytenr, sector_end,
1958 EXTENT_LOCKED, GFP_NOFS);
1960 ret = set_state_private(reloc_tree, bytenr, new_pos);
1964 ret = block_iterate_proc(NULL, new_pos / sectorsize,
1965 cur_offset / sectorsize, &data);
1966 if (ret & BLOCK_ABORT) {
1971 cur_offset += sectorsize;
1972 bytenr += sectorsize;
1973 num_bytes -= sectorsize;
1976 if (data.num_blocks > 0) {
1977 ret = record_file_blocks(trans, root,
1978 extent_key->objectid, &inode,
1979 data.first_block, data.disk_block,
1980 data.num_blocks, datacsum);
1985 key.objectid = extent_key->objectid;
1987 key.type = BTRFS_INODE_ITEM_KEY;
1988 ret = btrfs_lookup_inode(trans, root, &path, &key, 1);
1992 leaf = path.nodes[0];
1993 ptr = btrfs_item_ptr_offset(leaf, path.slots[0]);
1994 write_extent_buffer(leaf, &inode, ptr, sizeof(inode));
1995 btrfs_mark_buffer_dirty(leaf);
1996 btrfs_release_path(&path);
1999 btrfs_release_path(&path);
2003 static int relocate_extents_range(struct btrfs_root *fs_root,
2004 struct btrfs_root *ext2_root,
2005 u64 start_byte, u64 end_byte)
2007 struct btrfs_fs_info *info = fs_root->fs_info;
2008 struct btrfs_root *extent_root = info->extent_root;
2009 struct btrfs_root *cur_root = NULL;
2010 struct btrfs_trans_handle *trans;
2011 struct btrfs_extent_data_ref *dref;
2012 struct btrfs_extent_inline_ref *iref;
2013 struct btrfs_extent_item *ei;
2014 struct extent_buffer *leaf;
2015 struct btrfs_key key;
2016 struct btrfs_key extent_key;
2017 struct btrfs_path path;
2018 struct extent_io_tree reloc_tree;
2028 btrfs_init_path(&path);
2029 extent_io_tree_init(&reloc_tree);
2031 key.objectid = start_byte;
2033 key.type = BTRFS_EXTENT_ITEM_KEY;
2034 ret = btrfs_search_slot(NULL, extent_root, &key, &path, 0, 0);
2038 ret = btrfs_previous_item(extent_root, &path, 0,
2039 BTRFS_EXTENT_ITEM_KEY);
2043 leaf = path.nodes[0];
2044 btrfs_item_key_to_cpu(leaf, &key, path.slots[0]);
2045 if (key.objectid + key.offset > start_byte)
2046 start_byte = key.objectid;
2049 btrfs_release_path(&path);
2051 cur_root = (pass % 2 == 0) ? ext2_root : fs_root;
2054 trans = btrfs_start_transaction(cur_root, 1);
2057 cur_byte = start_byte;
2059 key.objectid = cur_byte;
2061 key.type = BTRFS_EXTENT_ITEM_KEY;
2062 ret = btrfs_search_slot(trans, extent_root,
2067 leaf = path.nodes[0];
2068 if (path.slots[0] >= btrfs_header_nritems(leaf)) {
2069 ret = btrfs_next_leaf(extent_root, &path);
2074 leaf = path.nodes[0];
2077 btrfs_item_key_to_cpu(leaf, &key, path.slots[0]);
2078 if (key.objectid < cur_byte ||
2079 key.type != BTRFS_EXTENT_ITEM_KEY) {
2083 if (key.objectid >= end_byte)
2088 cur_byte = key.objectid;
2089 num_bytes = key.offset;
2090 ei = btrfs_item_ptr(leaf, path.slots[0],
2091 struct btrfs_extent_item);
2092 BUG_ON(!(btrfs_extent_flags(leaf, ei) &
2093 BTRFS_EXTENT_FLAG_DATA));
2095 ptr = btrfs_item_ptr_offset(leaf, path.slots[0]);
2096 end = ptr + btrfs_item_size_nr(leaf, path.slots[0]);
2098 ptr += sizeof(struct btrfs_extent_item);
2101 iref = (struct btrfs_extent_inline_ref *)ptr;
2102 key.type = btrfs_extent_inline_ref_type(leaf, iref);
2103 BUG_ON(key.type != BTRFS_EXTENT_DATA_REF_KEY);
2104 dref = (struct btrfs_extent_data_ref *)(&iref->offset);
2105 ref_root = btrfs_extent_data_ref_root(leaf, dref);
2106 extent_key.objectid =
2107 btrfs_extent_data_ref_objectid(leaf, dref);
2109 btrfs_extent_data_ref_offset(leaf, dref);
2110 extent_key.type = BTRFS_EXTENT_DATA_KEY;
2111 BUG_ON(btrfs_extent_data_ref_count(leaf, dref) != 1);
2113 if (ref_root == cur_root->root_key.objectid)
2116 ptr += btrfs_extent_inline_ref_size(key.type);
2124 ret = relocate_one_reference(trans, cur_root, cur_byte,
2125 num_bytes, &extent_key,
2130 cur_byte += num_bytes;
2131 btrfs_release_path(&path);
2133 if (trans->blocks_used >= 4096) {
2134 ret = btrfs_commit_transaction(trans, cur_root);
2136 trans = btrfs_start_transaction(cur_root, 1);
2140 btrfs_release_path(&path);
2142 ret = btrfs_commit_transaction(trans, cur_root);
2145 if (num_extents > 0 && pass++ < 16)
2148 ret = (num_extents > 0) ? -1 : 0;
2150 btrfs_release_path(&path);
2151 extent_io_tree_cleanup(&reloc_tree);
2156 * relocate data in system chunk
2158 static int cleanup_sys_chunk(struct btrfs_root *fs_root,
2159 struct btrfs_root *ext2_root)
2161 struct btrfs_block_group_cache *cache;
2167 cache = btrfs_lookup_block_group(fs_root->fs_info, offset);
2171 end_byte = cache->key.objectid + cache->key.offset;
2172 if (cache->flags & BTRFS_BLOCK_GROUP_SYSTEM) {
2173 ret = relocate_extents_range(fs_root, ext2_root,
2174 cache->key.objectid,
2181 for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
2182 offset = btrfs_sb_offset(i);
2183 offset &= ~((u64)BTRFS_STRIPE_LEN - 1);
2185 ret = relocate_extents_range(fs_root, ext2_root,
2186 offset, offset + BTRFS_STRIPE_LEN);
2195 static int fixup_chunk_mapping(struct btrfs_root *root)
2197 struct btrfs_trans_handle *trans;
2198 struct btrfs_fs_info *info = root->fs_info;
2199 struct btrfs_root *chunk_root = info->chunk_root;
2200 struct extent_buffer *leaf;
2201 struct btrfs_key key;
2202 struct btrfs_path path;
2203 struct btrfs_chunk chunk;
2209 btrfs_init_path(&path);
2211 trans = btrfs_start_transaction(root, 1);
2215 * recow the whole chunk tree. this will move all chunk tree blocks
2216 * into system block group.
2218 memset(&key, 0, sizeof(key));
2220 ret = btrfs_search_slot(trans, chunk_root, &key, &path, 0, 1);
2224 ret = btrfs_next_leaf(chunk_root, &path);
2230 btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]);
2231 btrfs_release_path(&path);
2233 btrfs_release_path(&path);
2235 /* fixup the system chunk array in super block */
2236 btrfs_set_super_sys_array_size(info->super_copy, 0);
2238 key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID;
2240 key.type = BTRFS_CHUNK_ITEM_KEY;
2242 ret = btrfs_search_slot(trans, chunk_root, &key, &path, 0, 0);
2247 leaf = path.nodes[0];
2248 if (path.slots[0] >= btrfs_header_nritems(leaf)) {
2249 ret = btrfs_next_leaf(chunk_root, &path);
2254 leaf = path.nodes[0];
2256 btrfs_item_key_to_cpu(leaf, &key, path.slots[0]);
2257 if (key.type != BTRFS_CHUNK_ITEM_KEY)
2260 ptr = btrfs_item_ptr_offset(leaf, path.slots[0]);
2261 size = btrfs_item_size_nr(leaf, path.slots[0]);
2262 BUG_ON(size != sizeof(chunk));
2263 read_extent_buffer(leaf, &chunk, ptr, size);
2264 type = btrfs_stack_chunk_type(&chunk);
2266 if (!(type & BTRFS_BLOCK_GROUP_SYSTEM))
2269 ret = btrfs_add_system_chunk(trans, chunk_root, &key,
2277 ret = btrfs_commit_transaction(trans, root);
2280 btrfs_release_path(&path);
2284 static int do_convert(const char *devname, int datacsum, int packing, int noxattr,
2285 u32 nodesize, int copylabel, const char *fslabel, int progress,
2288 int i, ret, blocks_per_node;
2294 ext2_filsys ext2_fs;
2295 struct btrfs_root *root;
2296 struct btrfs_root *ext2_root;
2297 struct task_ctx ctx;
2298 char features_buf[64];
2300 ret = open_ext2fs(devname, &ext2_fs);
2302 fprintf(stderr, "unable to open the Ext2fs\n");
2305 blocksize = ext2_fs->blocksize;
2306 total_bytes = (u64)ext2_fs->super->s_blocks_count * blocksize;
2307 if (blocksize < 4096) {
2308 fprintf(stderr, "block size is too small\n");
2311 if (!(ext2_fs->super->s_feature_incompat &
2312 EXT2_FEATURE_INCOMPAT_FILETYPE)) {
2313 fprintf(stderr, "filetype feature is missing\n");
2316 if (btrfs_check_nodesize(nodesize, blocksize))
2318 blocks_per_node = nodesize / blocksize;
2319 ret = -blocks_per_node;
2320 for (i = 0; i < 7; i++) {
2321 if (nodesize == blocksize)
2322 ret = ext2_alloc_block(ext2_fs, 0, blocks + i);
2324 ret = ext2_alloc_block_range(ext2_fs,
2325 ret + blocks_per_node, blocks_per_node,
2328 fprintf(stderr, "not enough free space\n");
2331 blocks[i] *= blocksize;
2333 super_bytenr = blocks[0];
2334 fd = open(devname, O_RDWR);
2336 fprintf(stderr, "unable to open %s\n", devname);
2339 btrfs_parse_features_to_string(features_buf, features);
2340 if (features == BTRFS_MKFS_DEFAULT_FEATURES)
2341 strcat(features_buf, " (default)");
2343 printf("create btrfs filesystem:\n");
2344 printf("\tblocksize: %u\n", blocksize);
2345 printf("\tnodesize: %u\n", nodesize);
2346 printf("\tfeatures: %s\n", features_buf);
2347 ret = make_btrfs(fd, devname, ext2_fs->super->s_volume_name,
2348 NULL, blocks, total_bytes, nodesize,
2349 blocksize, blocksize, features);
2351 fprintf(stderr, "unable to create initial ctree: %s\n",
2355 /* create a system chunk that maps the whole device */
2356 ret = prepare_system_chunk(fd, super_bytenr);
2358 fprintf(stderr, "unable to update system chunk\n");
2361 root = open_ctree_fd(fd, devname, super_bytenr, OPEN_CTREE_WRITES);
2363 fprintf(stderr, "unable to open ctree\n");
2366 ret = cache_free_extents(root, ext2_fs);
2368 fprintf(stderr, "error during cache_free_extents %d\n", ret);
2371 root->fs_info->extent_ops = &extent_ops;
2372 /* recover block allocation bitmap */
2373 for (i = 0; i < 7; i++) {
2374 blocks[i] /= blocksize;
2375 if (nodesize == blocksize)
2376 ext2_free_block(ext2_fs, blocks[i]);
2378 ext2_free_block_range(ext2_fs, blocks[i],
2381 ret = init_btrfs(root);
2383 fprintf(stderr, "unable to setup the root tree\n");
2386 printf("creating btrfs metadata.\n");
2387 ctx.max_copy_inodes = (ext2_fs->super->s_inodes_count
2388 - ext2_fs->super->s_free_inodes_count);
2389 ctx.cur_copy_inodes = 0;
2392 ctx.info = task_init(print_copied_inodes, after_copied_inodes, &ctx);
2393 task_start(ctx.info);
2395 ret = copy_inodes(root, ext2_fs, datacsum, packing, noxattr, &ctx);
2397 fprintf(stderr, "error during copy_inodes %d\n", ret);
2401 task_stop(ctx.info);
2402 task_deinit(ctx.info);
2404 printf("creating ext2fs image file.\n");
2405 ext2_root = link_subvol(root, "ext2_saved", EXT2_IMAGE_SUBVOL_OBJECTID);
2407 fprintf(stderr, "unable to create subvol\n");
2410 ret = create_ext2_image(ext2_root, ext2_fs, "image", datacsum);
2412 fprintf(stderr, "error during create_ext2_image %d\n", ret);
2415 memset(root->fs_info->super_copy->label, 0, BTRFS_LABEL_SIZE);
2416 if (copylabel == 1) {
2417 strncpy(root->fs_info->super_copy->label,
2418 ext2_fs->super->s_volume_name, 16);
2419 fprintf(stderr, "copy label '%s'\n",
2420 root->fs_info->super_copy->label);
2421 } else if (copylabel == -1) {
2422 strncpy(root->fs_info->super_copy->label, fslabel, BTRFS_LABEL_SIZE);
2423 fprintf(stderr, "set label to '%s'\n", fslabel);
2426 printf("cleaning up system chunk.\n");
2427 ret = cleanup_sys_chunk(root, ext2_root);
2429 fprintf(stderr, "error during cleanup_sys_chunk %d\n", ret);
2432 ret = close_ctree(root);
2434 fprintf(stderr, "error during close_ctree %d\n", ret);
2437 close_ext2fs(ext2_fs);
2440 * If this step succeed, we get a mountable btrfs. Otherwise
2441 * the ext2fs is left unchanged.
2443 ret = migrate_super_block(fd, super_bytenr, blocksize);
2445 fprintf(stderr, "unable to migrate super block\n");
2449 root = open_ctree_fd(fd, devname, 0, OPEN_CTREE_WRITES);
2451 fprintf(stderr, "unable to open ctree\n");
2454 /* move chunk tree into system chunk. */
2455 ret = fixup_chunk_mapping(root);
2457 fprintf(stderr, "error during fixup_chunk_tree\n");
2460 ret = close_ctree(root);
2463 printf("conversion complete.\n");
2468 fprintf(stderr, "conversion aborted.\n");
2472 static int may_rollback(struct btrfs_root *root)
2474 struct btrfs_fs_info *info = root->fs_info;
2475 struct btrfs_multi_bio *multi = NULL;
2483 if (btrfs_super_num_devices(info->super_copy) != 1)
2486 bytenr = BTRFS_SUPER_INFO_OFFSET;
2487 total_bytes = btrfs_super_total_bytes(root->fs_info->super_copy);
2490 ret = btrfs_map_block(&info->mapping_tree, WRITE, bytenr,
2491 &length, &multi, 0, NULL);
2493 if (ret == -ENOENT) {
2494 /* removed block group at the tail */
2495 if (length == (u64)-1)
2498 /* removed block group in the middle */
2504 num_stripes = multi->num_stripes;
2505 physical = multi->stripes[0].physical;
2508 if (num_stripes != 1 || physical != bytenr)
2512 if (bytenr >= total_bytes)
2520 static int do_rollback(const char *devname)
2525 struct btrfs_root *root;
2526 struct btrfs_root *ext2_root;
2527 struct btrfs_root *chunk_root;
2528 struct btrfs_dir_item *dir;
2529 struct btrfs_inode_item *inode;
2530 struct btrfs_file_extent_item *fi;
2531 struct btrfs_trans_handle *trans;
2532 struct extent_buffer *leaf;
2533 struct btrfs_block_group_cache *cache1;
2534 struct btrfs_block_group_cache *cache2;
2535 struct btrfs_key key;
2536 struct btrfs_path path;
2537 struct extent_io_tree io_tree;
2552 extent_io_tree_init(&io_tree);
2554 fd = open(devname, O_RDWR);
2556 fprintf(stderr, "unable to open %s\n", devname);
2559 root = open_ctree_fd(fd, devname, 0, OPEN_CTREE_WRITES);
2561 fprintf(stderr, "unable to open ctree\n");
2564 ret = may_rollback(root);
2566 fprintf(stderr, "unable to do rollback\n");
2570 sectorsize = root->sectorsize;
2571 buf = malloc(sectorsize);
2573 fprintf(stderr, "unable to allocate memory\n");
2577 btrfs_init_path(&path);
2579 key.objectid = EXT2_IMAGE_SUBVOL_OBJECTID;
2580 key.type = BTRFS_ROOT_ITEM_KEY;
2581 key.offset = (u64)-1;
2582 ext2_root = btrfs_read_fs_root(root->fs_info, &key);
2583 if (!ext2_root || IS_ERR(ext2_root)) {
2584 fprintf(stderr, "unable to open subvol %llu\n",
2585 (unsigned long long)key.objectid);
2590 root_dir = btrfs_root_dirid(&root->root_item);
2591 dir = btrfs_lookup_dir_item(NULL, ext2_root, &path,
2592 root_dir, name, strlen(name), 0);
2593 if (!dir || IS_ERR(dir)) {
2594 fprintf(stderr, "unable to find file %s\n", name);
2597 leaf = path.nodes[0];
2598 btrfs_dir_item_key_to_cpu(leaf, dir, &key);
2599 btrfs_release_path(&path);
2601 objectid = key.objectid;
2603 ret = btrfs_lookup_inode(NULL, ext2_root, &path, &key, 0);
2605 fprintf(stderr, "unable to find inode item\n");
2608 leaf = path.nodes[0];
2609 inode = btrfs_item_ptr(leaf, path.slots[0], struct btrfs_inode_item);
2610 total_bytes = btrfs_inode_size(leaf, inode);
2611 btrfs_release_path(&path);
2613 key.objectid = objectid;
2615 btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY);
2616 ret = btrfs_search_slot(NULL, ext2_root, &key, &path, 0, 0);
2618 fprintf(stderr, "unable to find first file extent\n");
2619 btrfs_release_path(&path);
2623 /* build mapping tree for the relocated blocks */
2624 for (offset = 0; offset < total_bytes; ) {
2625 leaf = path.nodes[0];
2626 if (path.slots[0] >= btrfs_header_nritems(leaf)) {
2627 ret = btrfs_next_leaf(root, &path);
2633 btrfs_item_key_to_cpu(leaf, &key, path.slots[0]);
2634 if (key.objectid != objectid || key.offset != offset ||
2635 btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY)
2638 fi = btrfs_item_ptr(leaf, path.slots[0],
2639 struct btrfs_file_extent_item);
2640 if (btrfs_file_extent_type(leaf, fi) != BTRFS_FILE_EXTENT_REG)
2642 if (btrfs_file_extent_compression(leaf, fi) ||
2643 btrfs_file_extent_encryption(leaf, fi) ||
2644 btrfs_file_extent_other_encoding(leaf, fi))
2647 bytenr = btrfs_file_extent_disk_bytenr(leaf, fi);
2648 /* skip holes and direct mapped extents */
2649 if (bytenr == 0 || bytenr == offset)
2652 bytenr += btrfs_file_extent_offset(leaf, fi);
2653 num_bytes = btrfs_file_extent_num_bytes(leaf, fi);
2655 cache1 = btrfs_lookup_block_group(root->fs_info, offset);
2656 cache2 = btrfs_lookup_block_group(root->fs_info,
2657 offset + num_bytes - 1);
2658 if (!cache1 || cache1 != cache2 ||
2659 (!(cache1->flags & BTRFS_BLOCK_GROUP_SYSTEM) &&
2660 !intersect_with_sb(offset, num_bytes)))
2663 set_extent_bits(&io_tree, offset, offset + num_bytes - 1,
2664 EXTENT_LOCKED, GFP_NOFS);
2665 set_state_private(&io_tree, offset, bytenr);
2667 offset += btrfs_file_extent_num_bytes(leaf, fi);
2670 btrfs_release_path(&path);
2672 if (offset < total_bytes) {
2673 fprintf(stderr, "unable to build extent mapping\n");
2677 first_free = BTRFS_SUPER_INFO_OFFSET + 2 * sectorsize - 1;
2678 first_free &= ~((u64)sectorsize - 1);
2679 /* backup for extent #0 should exist */
2680 if(!test_range_bit(&io_tree, 0, first_free - 1, EXTENT_LOCKED, 1)) {
2681 fprintf(stderr, "no backup for the first extent\n");
2684 /* force no allocation from system block group */
2685 root->fs_info->system_allocs = -1;
2686 trans = btrfs_start_transaction(root, 1);
2689 * recow the whole chunk tree, this will remove all chunk tree blocks
2690 * from system block group
2692 chunk_root = root->fs_info->chunk_root;
2693 memset(&key, 0, sizeof(key));
2695 ret = btrfs_search_slot(trans, chunk_root, &key, &path, 0, 1);
2699 ret = btrfs_next_leaf(chunk_root, &path);
2703 btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]);
2704 btrfs_release_path(&path);
2706 btrfs_release_path(&path);
2711 cache1 = btrfs_lookup_block_group(root->fs_info, offset);
2715 if (cache1->flags & BTRFS_BLOCK_GROUP_SYSTEM)
2716 num_bytes += btrfs_block_group_used(&cache1->item);
2718 offset = cache1->key.objectid + cache1->key.offset;
2720 /* only extent #0 left in system block group? */
2721 if (num_bytes > first_free) {
2722 fprintf(stderr, "unable to empty system block group\n");
2725 /* create a system chunk that maps the whole device */
2726 ret = prepare_system_chunk_sb(root->fs_info->super_copy);
2728 fprintf(stderr, "unable to update system chunk\n");
2732 ret = btrfs_commit_transaction(trans, root);
2735 ret = close_ctree(root);
2737 fprintf(stderr, "error during close_ctree %d\n", ret);
2741 /* zero btrfs super block mirrors */
2742 memset(buf, 0, sectorsize);
2743 for (i = 1 ; i < BTRFS_SUPER_MIRROR_MAX; i++) {
2744 bytenr = btrfs_sb_offset(i);
2745 if (bytenr >= total_bytes)
2747 ret = pwrite(fd, buf, sectorsize, bytenr);
2748 if (ret != sectorsize) {
2750 "error during zeroing supreblock %d: %d\n",
2756 sb_bytenr = (u64)-1;
2757 /* copy all relocated blocks back */
2759 ret = find_first_extent_bit(&io_tree, 0, &start, &end,
2764 ret = get_state_private(&io_tree, start, &bytenr);
2767 clear_extent_bits(&io_tree, start, end, EXTENT_LOCKED,
2770 while (start <= end) {
2771 if (start == BTRFS_SUPER_INFO_OFFSET) {
2775 ret = pread(fd, buf, sectorsize, bytenr);
2777 fprintf(stderr, "error during pread %d\n", ret);
2780 BUG_ON(ret != sectorsize);
2781 ret = pwrite(fd, buf, sectorsize, start);
2783 fprintf(stderr, "error during pwrite %d\n", ret);
2786 BUG_ON(ret != sectorsize);
2788 start += sectorsize;
2789 bytenr += sectorsize;
2795 fprintf(stderr, "error during fsync %d\n", ret);
2799 * finally, overwrite btrfs super block.
2801 ret = pread(fd, buf, sectorsize, sb_bytenr);
2803 fprintf(stderr, "error during pread %d\n", ret);
2806 BUG_ON(ret != sectorsize);
2807 ret = pwrite(fd, buf, sectorsize, BTRFS_SUPER_INFO_OFFSET);
2809 fprintf(stderr, "error during pwrite %d\n", ret);
2812 BUG_ON(ret != sectorsize);
2815 fprintf(stderr, "error during fsync %d\n", ret);
2821 extent_io_tree_cleanup(&io_tree);
2822 printf("rollback complete.\n");
2829 fprintf(stderr, "rollback aborted.\n");
2833 static void print_usage(void)
2835 printf("usage: btrfs-convert [options] device\n");
2836 printf("options:\n");
2837 printf("\t-d|--no-datasum disable data checksum, sets NODATASUM\n");
2838 printf("\t-i|--no-xattr ignore xattrs and ACLs\n");
2839 printf("\t-n|--no-inline disable inlining of small files to metadata\n");
2840 printf("\t-N|--nodesize SIZE set filesystem metadata nodesize\n");
2841 printf("\t-r|--rollback roll back to ext2fs\n");
2842 printf("\t-l|--label LABEL set filesystem label\n");
2843 printf("\t-L|--copy-label use label from converted filesystem\n");
2844 printf("\t-p|--progress show converting progress (default)\n");
2845 printf("\t-O|--features LIST comma separated list of filesystem features\n");
2846 printf("\t--no-progress show only overview, not the detailed progress\n");
2849 int main(int argc, char *argv[])
2855 u32 nodesize = max_t(u32, sysconf(_SC_PAGESIZE),
2856 BTRFS_MKFS_DEFAULT_NODE_SIZE);
2859 int usage_error = 0;
2862 char *fslabel = NULL;
2863 u64 features = BTRFS_MKFS_DEFAULT_FEATURES;
2866 enum { GETOPT_VAL_NO_PROGRESS = 256 };
2867 static const struct option long_options[] = {
2868 { "no-progress", no_argument, NULL,
2869 GETOPT_VAL_NO_PROGRESS },
2870 { "no-datasum", no_argument, NULL, 'd' },
2871 { "no-inline", no_argument, NULL, 'n' },
2872 { "no-xattr", no_argument, NULL, 'i' },
2873 { "rollback", no_argument, NULL, 'r' },
2874 { "features", required_argument, NULL, 'O' },
2875 { "progress", no_argument, NULL, 'p' },
2876 { "label", required_argument, NULL, 'l' },
2877 { "copy-label", no_argument, NULL, 'L' },
2878 { "nodesize", required_argument, NULL, 'N' },
2879 { NULL, 0, NULL, 0 }
2881 int c = getopt_long(argc, argv, "dinN:rl:LpO:", long_options, NULL);
2896 nodesize = parse_size(optarg);
2903 fslabel = strdup(optarg);
2904 if (strlen(fslabel) > BTRFS_LABEL_SIZE) {
2906 "warning: label too long, trimmed to %d bytes\n",
2908 fslabel[BTRFS_LABEL_SIZE] = 0;
2918 char *orig = strdup(optarg);
2921 tmp = btrfs_parse_fs_features(tmp, &features);
2924 "Unrecognized filesystem feature '%s'\n",
2930 if (features & BTRFS_FEATURE_LIST_ALL) {
2931 btrfs_list_all_fs_features(
2932 ~BTRFS_CONVERT_ALLOWED_FEATURES);
2935 if (features & ~BTRFS_CONVERT_ALLOWED_FEATURES) {
2938 btrfs_parse_features_to_string(buf,
2939 features & ~BTRFS_CONVERT_ALLOWED_FEATURES);
2941 "ERROR: features not allowed for convert: %s\n",
2948 case GETOPT_VAL_NO_PROGRESS:
2956 argc = argc - optind;
2958 if (check_argc_exact(argc, 1)) {
2963 if (rollback && (!datacsum || noxattr || !packing)) {
2965 "Usage error: -d, -i, -n options do not apply to rollback\n");
2974 file = argv[optind];
2975 ret = check_mounted(file);
2977 fprintf(stderr, "Could not check mount status: %s\n",
2981 fprintf(stderr, "%s is mounted\n", file);
2986 ret = do_rollback(file);
2988 ret = do_convert(file, datacsum, packing, noxattr, nodesize,
2989 copylabel, fslabel, progress, features);