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>
30 #include <uuid/uuid.h>
31 #include <linux/limits.h>
37 #include "transaction.h"
40 #include "task-utils.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 EXT2_IMAGE_SUBVOL_OBJECTID BTRFS_FIRST_FREE_OBJECTID
49 uint32_t max_copy_inodes;
50 uint32_t cur_copy_inodes;
51 struct task_info *info;
54 static void *print_copied_inodes(void *p)
56 struct task_ctx *priv = p;
57 const char work_indicator[] = { '.', 'o', 'O', 'o' };
60 task_period_start(priv->info, 1000 /* 1s */);
63 printf("copy inodes [%c] [%10d/%10d]\r",
64 work_indicator[count % 4], priv->cur_copy_inodes,
65 priv->max_copy_inodes);
67 task_period_wait(priv->info);
73 static int after_copied_inodes(void *p)
75 struct task_ctx *priv = p;
78 task_period_stop(priv->info);
84 * Open Ext2fs in readonly mode, read block allocation bitmap and
85 * inode bitmap into memory.
87 static int open_ext2fs(const char *name, ext2_filsys *ret_fs)
92 ret = ext2fs_open(name, 0, 0, 0, unix_io_manager, &ext2_fs);
94 fprintf(stderr, "ext2fs_open: %s\n", error_message(ret));
97 ret = ext2fs_read_inode_bitmap(ext2_fs);
99 fprintf(stderr, "ext2fs_read_inode_bitmap: %s\n",
103 ret = ext2fs_read_block_bitmap(ext2_fs);
105 fprintf(stderr, "ext2fs_read_block_bitmap: %s\n",
110 * search each block group for a free inode. this set up
111 * uninit block/inode bitmaps appropriately.
114 while (ino <= ext2_fs->super->s_inodes_count) {
116 ext2fs_new_inode(ext2_fs, ino, 0, NULL, &foo);
117 ino += EXT2_INODES_PER_GROUP(ext2_fs->super);
126 static int close_ext2fs(ext2_filsys fs)
132 static int ext2_alloc_block(ext2_filsys fs, u64 goal, u64 *block_ret)
136 if (!ext2fs_new_block(fs, goal, NULL, &block)) {
137 ext2fs_fast_mark_block_bitmap(fs->block_map, block);
144 static int ext2_free_block(ext2_filsys fs, u64 block)
146 BUG_ON(block != (blk_t)block);
147 ext2fs_fast_unmark_block_bitmap(fs->block_map, block);
151 static int cache_free_extents(struct btrfs_root *root, ext2_filsys ext2_fs)
157 u64 blocksize = ext2_fs->blocksize;
159 block = ext2_fs->super->s_first_data_block;
160 for (; block < ext2_fs->super->s_blocks_count; block++) {
161 if (ext2fs_fast_test_block_bitmap(ext2_fs->block_map, block))
163 bytenr = block * blocksize;
164 ret = set_extent_dirty(&root->fs_info->free_space_cache,
165 bytenr, bytenr + blocksize - 1, 0);
169 for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
170 bytenr = btrfs_sb_offset(i);
171 bytenr &= ~((u64)BTRFS_STRIPE_LEN - 1);
172 if (bytenr >= blocksize * ext2_fs->super->s_blocks_count)
174 clear_extent_dirty(&root->fs_info->free_space_cache, bytenr,
175 bytenr + BTRFS_STRIPE_LEN - 1, 0);
178 clear_extent_dirty(&root->fs_info->free_space_cache,
179 0, BTRFS_SUPER_INFO_OFFSET - 1, 0);
184 static int custom_alloc_extent(struct btrfs_root *root, u64 num_bytes,
185 u64 hint_byte, struct btrfs_key *ins)
189 u64 last = hint_byte;
192 struct btrfs_block_group_cache *cache;
195 ret = find_first_extent_bit(&root->fs_info->free_space_cache,
196 last, &start, &end, EXTENT_DIRTY);
198 if (wrapped++ == 0) {
206 start = max(last, start);
208 if (last - start < num_bytes)
211 last = start + num_bytes;
212 if (test_range_bit(&root->fs_info->pinned_extents,
213 start, last - 1, EXTENT_DIRTY, 0))
216 cache = btrfs_lookup_block_group(root->fs_info, start);
218 if (cache->flags & BTRFS_BLOCK_GROUP_SYSTEM ||
219 last > cache->key.objectid + cache->key.offset) {
220 last = cache->key.objectid + cache->key.offset;
224 clear_extent_dirty(&root->fs_info->free_space_cache,
225 start, start + num_bytes - 1, 0);
227 ins->objectid = start;
228 ins->offset = num_bytes;
229 ins->type = BTRFS_EXTENT_ITEM_KEY;
233 fprintf(stderr, "not enough free space\n");
237 static int intersect_with_sb(u64 bytenr, u64 num_bytes)
242 for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
243 offset = btrfs_sb_offset(i);
244 offset &= ~((u64)BTRFS_STRIPE_LEN - 1);
246 if (bytenr < offset + BTRFS_STRIPE_LEN &&
247 bytenr + num_bytes > offset)
253 static int custom_free_extent(struct btrfs_root *root, u64 bytenr,
256 return intersect_with_sb(bytenr, num_bytes);
259 static struct btrfs_extent_ops extent_ops = {
260 .alloc_extent = custom_alloc_extent,
261 .free_extent = custom_free_extent,
264 struct dir_iterate_data {
265 struct btrfs_trans_handle *trans;
266 struct btrfs_root *root;
267 struct btrfs_inode_item *inode;
274 static u8 filetype_conversion_table[EXT2_FT_MAX] = {
275 [EXT2_FT_UNKNOWN] = BTRFS_FT_UNKNOWN,
276 [EXT2_FT_REG_FILE] = BTRFS_FT_REG_FILE,
277 [EXT2_FT_DIR] = BTRFS_FT_DIR,
278 [EXT2_FT_CHRDEV] = BTRFS_FT_CHRDEV,
279 [EXT2_FT_BLKDEV] = BTRFS_FT_BLKDEV,
280 [EXT2_FT_FIFO] = BTRFS_FT_FIFO,
281 [EXT2_FT_SOCK] = BTRFS_FT_SOCK,
282 [EXT2_FT_SYMLINK] = BTRFS_FT_SYMLINK,
285 static int dir_iterate_proc(ext2_ino_t dir, int entry,
286 struct ext2_dir_entry *dirent,
287 int offset, int blocksize,
288 char *buf,void *priv_data)
294 char dotdot[] = "..";
295 struct btrfs_key location;
296 struct dir_iterate_data *idata = (struct dir_iterate_data *)priv_data;
299 name_len = dirent->name_len & 0xFF;
301 objectid = dirent->inode + INO_OFFSET;
302 if (!strncmp(dirent->name, dotdot, name_len)) {
304 BUG_ON(idata->parent != 0);
305 idata->parent = objectid;
309 if (dirent->inode < EXT2_GOOD_OLD_FIRST_INO)
312 location.objectid = objectid;
314 btrfs_set_key_type(&location, BTRFS_INODE_ITEM_KEY);
316 file_type = dirent->name_len >> 8;
317 BUG_ON(file_type > EXT2_FT_SYMLINK);
318 ret = btrfs_insert_dir_item(idata->trans, idata->root,
319 dirent->name, name_len,
320 idata->objectid, &location,
321 filetype_conversion_table[file_type],
325 ret = btrfs_insert_inode_ref(idata->trans, idata->root,
326 dirent->name, name_len,
327 objectid, idata->objectid,
332 inode_size = btrfs_stack_inode_size(idata->inode) +
334 btrfs_set_stack_inode_size(idata->inode, inode_size);
337 idata->errcode = ret;
341 static int create_dir_entries(struct btrfs_trans_handle *trans,
342 struct btrfs_root *root, u64 objectid,
343 struct btrfs_inode_item *btrfs_inode,
344 ext2_filsys ext2_fs, ext2_ino_t ext2_ino)
348 struct dir_iterate_data data = {
351 .inode = btrfs_inode,
352 .objectid = objectid,
358 err = ext2fs_dir_iterate2(ext2_fs, ext2_ino, 0, NULL,
359 dir_iterate_proc, &data);
363 if (ret == 0 && data.parent == objectid) {
364 ret = btrfs_insert_inode_ref(trans, root, "..", 2,
365 objectid, objectid, 0);
369 fprintf(stderr, "ext2fs_dir_iterate2: %s\n", error_message(err));
373 static int read_disk_extent(struct btrfs_root *root, u64 bytenr,
374 u32 num_bytes, char *buffer)
377 struct btrfs_fs_devices *fs_devs = root->fs_info->fs_devices;
379 ret = pread(fs_devs->latest_bdev, buffer, num_bytes, bytenr);
380 if (ret != num_bytes)
389 static int csum_disk_extent(struct btrfs_trans_handle *trans,
390 struct btrfs_root *root,
391 u64 disk_bytenr, u64 num_bytes)
393 u32 blocksize = root->sectorsize;
398 buffer = malloc(blocksize);
401 for (offset = 0; offset < num_bytes; offset += blocksize) {
402 ret = read_disk_extent(root, disk_bytenr + offset,
406 ret = btrfs_csum_file_block(trans,
407 root->fs_info->csum_root,
408 disk_bytenr + num_bytes,
409 disk_bytenr + offset,
418 static int record_file_blocks(struct btrfs_trans_handle *trans,
419 struct btrfs_root *root, u64 objectid,
420 struct btrfs_inode_item *inode,
421 u64 file_block, u64 disk_block,
422 u64 num_blocks, int checksum)
425 u64 file_pos = file_block * root->sectorsize;
426 u64 disk_bytenr = disk_block * root->sectorsize;
427 u64 num_bytes = num_blocks * root->sectorsize;
428 ret = btrfs_record_file_extent(trans, root, objectid, inode, file_pos,
429 disk_bytenr, num_bytes);
431 if (ret || !checksum || disk_bytenr == 0)
434 return csum_disk_extent(trans, root, disk_bytenr, num_bytes);
437 struct blk_iterate_data {
438 struct btrfs_trans_handle *trans;
439 struct btrfs_root *root;
440 struct btrfs_inode_item *inode;
450 static int block_iterate_proc(ext2_filsys ext2_fs,
451 u64 disk_block, u64 file_block,
452 struct blk_iterate_data *idata)
457 struct btrfs_root *root = idata->root;
458 struct btrfs_trans_handle *trans = idata->trans;
459 struct btrfs_block_group_cache *cache;
460 u64 bytenr = disk_block * root->sectorsize;
462 sb_region = intersect_with_sb(bytenr, root->sectorsize);
463 do_barrier = sb_region || disk_block >= idata->boundary;
464 if ((idata->num_blocks > 0 && do_barrier) ||
465 (file_block > idata->first_block + idata->num_blocks) ||
466 (disk_block != idata->disk_block + idata->num_blocks)) {
467 if (idata->num_blocks > 0) {
468 ret = record_file_blocks(trans, root, idata->objectid,
469 idata->inode, idata->first_block,
470 idata->disk_block, idata->num_blocks,
474 idata->first_block += idata->num_blocks;
475 idata->num_blocks = 0;
477 if (file_block > idata->first_block) {
478 ret = record_file_blocks(trans, root, idata->objectid,
479 idata->inode, idata->first_block,
480 0, file_block - idata->first_block,
487 bytenr += BTRFS_STRIPE_LEN - 1;
488 bytenr &= ~((u64)BTRFS_STRIPE_LEN - 1);
490 cache = btrfs_lookup_block_group(root->fs_info, bytenr);
492 bytenr = cache->key.objectid + cache->key.offset;
495 idata->first_block = file_block;
496 idata->disk_block = disk_block;
497 idata->boundary = bytenr / root->sectorsize;
502 idata->errcode = ret;
506 static int __block_iterate_proc(ext2_filsys fs, blk_t *blocknr,
507 e2_blkcnt_t blockcnt, blk_t ref_block,
508 int ref_offset, void *priv_data)
510 struct blk_iterate_data *idata;
511 idata = (struct blk_iterate_data *)priv_data;
512 return block_iterate_proc(fs, *blocknr, blockcnt, idata);
516 * traverse file's data blocks, record these data blocks as file extents.
518 static int create_file_extents(struct btrfs_trans_handle *trans,
519 struct btrfs_root *root, u64 objectid,
520 struct btrfs_inode_item *btrfs_inode,
521 ext2_filsys ext2_fs, ext2_ino_t ext2_ino,
522 int datacsum, int packing)
528 u32 sectorsize = root->sectorsize;
529 u64 inode_size = btrfs_stack_inode_size(btrfs_inode);
530 struct blk_iterate_data data = {
533 .inode = btrfs_inode,
534 .objectid = objectid,
539 .checksum = datacsum,
542 err = ext2fs_block_iterate2(ext2_fs, ext2_ino, BLOCK_FLAG_DATA_ONLY,
543 NULL, __block_iterate_proc, &data);
549 if (packing && data.first_block == 0 && data.num_blocks > 0 &&
550 inode_size <= BTRFS_MAX_INLINE_DATA_SIZE(root)) {
551 u64 num_bytes = data.num_blocks * sectorsize;
552 u64 disk_bytenr = data.disk_block * sectorsize;
555 buffer = malloc(num_bytes);
558 ret = read_disk_extent(root, disk_bytenr, num_bytes, buffer);
561 if (num_bytes > inode_size)
562 num_bytes = inode_size;
563 ret = btrfs_insert_inline_extent(trans, root, objectid,
564 0, buffer, num_bytes);
567 nbytes = btrfs_stack_inode_nbytes(btrfs_inode) + num_bytes;
568 btrfs_set_stack_inode_nbytes(btrfs_inode, nbytes);
569 } else if (data.num_blocks > 0) {
570 ret = record_file_blocks(trans, root, objectid, btrfs_inode,
571 data.first_block, data.disk_block,
572 data.num_blocks, data.checksum);
576 data.first_block += data.num_blocks;
577 last_block = (inode_size + sectorsize - 1) / sectorsize;
578 if (last_block > data.first_block) {
579 ret = record_file_blocks(trans, root, objectid, btrfs_inode,
580 data.first_block, 0, last_block -
581 data.first_block, data.checksum);
587 fprintf(stderr, "ext2fs_block_iterate2: %s\n", error_message(err));
591 static int create_symbol_link(struct btrfs_trans_handle *trans,
592 struct btrfs_root *root, u64 objectid,
593 struct btrfs_inode_item *btrfs_inode,
594 ext2_filsys ext2_fs, ext2_ino_t ext2_ino,
595 struct ext2_inode *ext2_inode)
599 u64 inode_size = btrfs_stack_inode_size(btrfs_inode);
600 if (ext2fs_inode_data_blocks(ext2_fs, ext2_inode)) {
601 btrfs_set_stack_inode_size(btrfs_inode, inode_size + 1);
602 ret = create_file_extents(trans, root, objectid, btrfs_inode,
603 ext2_fs, ext2_ino, 1, 1);
604 btrfs_set_stack_inode_size(btrfs_inode, inode_size);
608 pathname = (char *)&(ext2_inode->i_block[0]);
609 BUG_ON(pathname[inode_size] != 0);
610 ret = btrfs_insert_inline_extent(trans, root, objectid, 0,
611 pathname, inode_size + 1);
612 btrfs_set_stack_inode_nbytes(btrfs_inode, inode_size + 1);
617 * Following xattr/acl related codes are based on codes in
618 * fs/ext3/xattr.c and fs/ext3/acl.c
620 #define EXT2_XATTR_BHDR(ptr) ((struct ext2_ext_attr_header *)(ptr))
621 #define EXT2_XATTR_BFIRST(ptr) \
622 ((struct ext2_ext_attr_entry *)(EXT2_XATTR_BHDR(ptr) + 1))
623 #define EXT2_XATTR_IHDR(inode) \
624 ((struct ext2_ext_attr_header *) ((void *)(inode) + \
625 EXT2_GOOD_OLD_INODE_SIZE + (inode)->i_extra_isize))
626 #define EXT2_XATTR_IFIRST(inode) \
627 ((struct ext2_ext_attr_entry *) ((void *)EXT2_XATTR_IHDR(inode) + \
628 sizeof(EXT2_XATTR_IHDR(inode)->h_magic)))
630 static int ext2_xattr_check_names(struct ext2_ext_attr_entry *entry,
633 struct ext2_ext_attr_entry *next;
635 while (!EXT2_EXT_IS_LAST_ENTRY(entry)) {
636 next = EXT2_EXT_ATTR_NEXT(entry);
637 if ((void *)next >= end)
644 static int ext2_xattr_check_block(const char *buf, size_t size)
647 struct ext2_ext_attr_header *header = EXT2_XATTR_BHDR(buf);
649 if (header->h_magic != EXT2_EXT_ATTR_MAGIC ||
650 header->h_blocks != 1)
652 error = ext2_xattr_check_names(EXT2_XATTR_BFIRST(buf), buf + size);
656 static int ext2_xattr_check_entry(struct ext2_ext_attr_entry *entry,
659 size_t value_size = entry->e_value_size;
661 if (entry->e_value_block != 0 || value_size > size ||
662 entry->e_value_offs + value_size > size)
667 #define EXT2_ACL_VERSION 0x0001
678 } ext2_acl_entry_short;
684 static inline int ext2_acl_count(size_t size)
687 size -= sizeof(ext2_acl_header);
688 s = size - 4 * sizeof(ext2_acl_entry_short);
690 if (size % sizeof(ext2_acl_entry_short))
692 return size / sizeof(ext2_acl_entry_short);
694 if (s % sizeof(ext2_acl_entry))
696 return s / sizeof(ext2_acl_entry) + 4;
700 #define ACL_EA_VERSION 0x0002
710 acl_ea_entry a_entries[0];
713 static inline size_t acl_ea_size(int count)
715 return sizeof(acl_ea_header) + count * sizeof(acl_ea_entry);
718 static int ext2_acl_to_xattr(void *dst, const void *src,
719 size_t dst_size, size_t src_size)
722 const void *end = src + src_size;
723 acl_ea_header *ext_acl = (acl_ea_header *)dst;
724 acl_ea_entry *dst_entry = ext_acl->a_entries;
725 ext2_acl_entry *src_entry;
727 if (src_size < sizeof(ext2_acl_header))
729 if (((ext2_acl_header *)src)->a_version !=
730 cpu_to_le32(EXT2_ACL_VERSION))
732 src += sizeof(ext2_acl_header);
733 count = ext2_acl_count(src_size);
737 BUG_ON(dst_size < acl_ea_size(count));
738 ext_acl->a_version = cpu_to_le32(ACL_EA_VERSION);
739 for (i = 0; i < count; i++, dst_entry++) {
740 src_entry = (ext2_acl_entry *)src;
741 if (src + sizeof(ext2_acl_entry_short) > end)
743 dst_entry->e_tag = src_entry->e_tag;
744 dst_entry->e_perm = src_entry->e_perm;
745 switch (le16_to_cpu(src_entry->e_tag)) {
750 src += sizeof(ext2_acl_entry_short);
751 dst_entry->e_id = cpu_to_le32(ACL_UNDEFINED_ID);
755 src += sizeof(ext2_acl_entry);
758 dst_entry->e_id = src_entry->e_id;
771 static char *xattr_prefix_table[] = {
773 [2] = "system.posix_acl_access",
774 [3] = "system.posix_acl_default",
779 static int copy_single_xattr(struct btrfs_trans_handle *trans,
780 struct btrfs_root *root, u64 objectid,
781 struct ext2_ext_attr_entry *entry,
782 const void *data, u32 datalen)
787 void *databuf = NULL;
788 char namebuf[XATTR_NAME_MAX + 1];
790 name_index = entry->e_name_index;
791 if (name_index >= ARRAY_SIZE(xattr_prefix_table) ||
792 xattr_prefix_table[name_index] == NULL)
794 name_len = strlen(xattr_prefix_table[name_index]) +
796 if (name_len >= sizeof(namebuf))
799 if (name_index == 2 || name_index == 3) {
800 size_t bufsize = acl_ea_size(ext2_acl_count(datalen));
801 databuf = malloc(bufsize);
804 ret = ext2_acl_to_xattr(databuf, data, bufsize, datalen);
810 strncpy(namebuf, xattr_prefix_table[name_index], XATTR_NAME_MAX);
811 strncat(namebuf, EXT2_EXT_ATTR_NAME(entry), entry->e_name_len);
812 if (name_len + datalen > BTRFS_LEAF_DATA_SIZE(root) -
813 sizeof(struct btrfs_item) - sizeof(struct btrfs_dir_item)) {
814 fprintf(stderr, "skip large xattr on inode %Lu name %.*s\n",
815 objectid - INO_OFFSET, name_len, namebuf);
818 ret = btrfs_insert_xattr_item(trans, root, namebuf, name_len,
819 data, datalen, objectid);
825 static int copy_extended_attrs(struct btrfs_trans_handle *trans,
826 struct btrfs_root *root, u64 objectid,
827 struct btrfs_inode_item *btrfs_inode,
828 ext2_filsys ext2_fs, ext2_ino_t ext2_ino)
834 u32 block_size = ext2_fs->blocksize;
835 u32 inode_size = EXT2_INODE_SIZE(ext2_fs->super);
836 struct ext2_inode_large *ext2_inode;
837 struct ext2_ext_attr_entry *entry;
840 char inode_buf[EXT2_GOOD_OLD_INODE_SIZE];
842 if (inode_size <= EXT2_GOOD_OLD_INODE_SIZE) {
843 ext2_inode = (struct ext2_inode_large *)inode_buf;
845 ext2_inode = (struct ext2_inode_large *)malloc(inode_size);
849 err = ext2fs_read_inode_full(ext2_fs, ext2_ino, (void *)ext2_inode,
852 fprintf(stderr, "ext2fs_read_inode_full: %s\n",
858 if (ext2_ino > ext2_fs->super->s_first_ino &&
859 inode_size > EXT2_GOOD_OLD_INODE_SIZE) {
860 if (EXT2_GOOD_OLD_INODE_SIZE +
861 ext2_inode->i_extra_isize > inode_size) {
865 if (ext2_inode->i_extra_isize != 0 &&
866 EXT2_XATTR_IHDR(ext2_inode)->h_magic ==
867 EXT2_EXT_ATTR_MAGIC) {
873 void *end = (void *)ext2_inode + inode_size;
874 entry = EXT2_XATTR_IFIRST(ext2_inode);
875 total = end - (void *)entry;
876 ret = ext2_xattr_check_names(entry, end);
879 while (!EXT2_EXT_IS_LAST_ENTRY(entry)) {
880 ret = ext2_xattr_check_entry(entry, total);
883 data = (void *)EXT2_XATTR_IFIRST(ext2_inode) +
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 (ext2_inode->i_file_acl == 0)
897 buffer = malloc(block_size);
902 err = ext2fs_read_ext_attr(ext2_fs, ext2_inode->i_file_acl, buffer);
904 fprintf(stderr, "ext2fs_read_ext_attr: %s\n",
909 ret = ext2_xattr_check_block(buffer, block_size);
913 entry = EXT2_XATTR_BFIRST(buffer);
914 while (!EXT2_EXT_IS_LAST_ENTRY(entry)) {
915 ret = ext2_xattr_check_entry(entry, block_size);
918 data = buffer + entry->e_value_offs;
919 datalen = entry->e_value_size;
920 ret = copy_single_xattr(trans, root, objectid,
921 entry, data, datalen);
924 entry = EXT2_EXT_ATTR_NEXT(entry);
928 if ((void *)ext2_inode != inode_buf)
933 #define MKDEV(ma, mi) (((ma) << MINORBITS) | (mi))
935 static inline dev_t old_decode_dev(u16 val)
937 return MKDEV((val >> 8) & 255, val & 255);
940 static inline dev_t new_decode_dev(u32 dev)
942 unsigned major = (dev & 0xfff00) >> 8;
943 unsigned minor = (dev & 0xff) | ((dev >> 12) & 0xfff00);
944 return MKDEV(major, minor);
947 static int copy_inode_item(struct btrfs_inode_item *dst,
948 struct ext2_inode *src, u32 blocksize)
950 btrfs_set_stack_inode_generation(dst, 1);
951 btrfs_set_stack_inode_size(dst, src->i_size);
952 btrfs_set_stack_inode_nbytes(dst, 0);
953 btrfs_set_stack_inode_block_group(dst, 0);
954 btrfs_set_stack_inode_nlink(dst, src->i_links_count);
955 btrfs_set_stack_inode_uid(dst, src->i_uid | (src->i_uid_high << 16));
956 btrfs_set_stack_inode_gid(dst, src->i_gid | (src->i_gid_high << 16));
957 btrfs_set_stack_inode_mode(dst, src->i_mode);
958 btrfs_set_stack_inode_rdev(dst, 0);
959 btrfs_set_stack_inode_flags(dst, 0);
960 btrfs_set_stack_timespec_sec(&dst->atime, src->i_atime);
961 btrfs_set_stack_timespec_nsec(&dst->atime, 0);
962 btrfs_set_stack_timespec_sec(&dst->ctime, src->i_ctime);
963 btrfs_set_stack_timespec_nsec(&dst->ctime, 0);
964 btrfs_set_stack_timespec_sec(&dst->mtime, src->i_mtime);
965 btrfs_set_stack_timespec_nsec(&dst->mtime, 0);
966 btrfs_set_stack_timespec_sec(&dst->otime, 0);
967 btrfs_set_stack_timespec_nsec(&dst->otime, 0);
969 if (S_ISDIR(src->i_mode)) {
970 btrfs_set_stack_inode_size(dst, 0);
971 btrfs_set_stack_inode_nlink(dst, 1);
973 if (S_ISREG(src->i_mode)) {
974 btrfs_set_stack_inode_size(dst, (u64)src->i_size_high << 32 |
977 if (!S_ISREG(src->i_mode) && !S_ISDIR(src->i_mode) &&
978 !S_ISLNK(src->i_mode)) {
979 if (src->i_block[0]) {
980 btrfs_set_stack_inode_rdev(dst,
981 old_decode_dev(src->i_block[0]));
983 btrfs_set_stack_inode_rdev(dst,
984 new_decode_dev(src->i_block[1]));
991 * copy a single inode. do all the required works, such as cloning
992 * inode item, creating file extents and creating directory entries.
994 static int copy_single_inode(struct btrfs_trans_handle *trans,
995 struct btrfs_root *root, u64 objectid,
996 ext2_filsys ext2_fs, ext2_ino_t ext2_ino,
997 struct ext2_inode *ext2_inode,
998 int datacsum, int packing, int noxattr)
1001 struct btrfs_key inode_key;
1002 struct btrfs_inode_item btrfs_inode;
1004 if (ext2_inode->i_links_count == 0)
1007 copy_inode_item(&btrfs_inode, ext2_inode, ext2_fs->blocksize);
1008 if (!datacsum && S_ISREG(ext2_inode->i_mode)) {
1009 u32 flags = btrfs_stack_inode_flags(&btrfs_inode) |
1010 BTRFS_INODE_NODATASUM;
1011 btrfs_set_stack_inode_flags(&btrfs_inode, flags);
1014 switch (ext2_inode->i_mode & S_IFMT) {
1016 ret = create_file_extents(trans, root, objectid, &btrfs_inode,
1017 ext2_fs, ext2_ino, datacsum, packing);
1020 ret = create_dir_entries(trans, root, objectid, &btrfs_inode,
1024 ret = create_symbol_link(trans, root, objectid, &btrfs_inode,
1025 ext2_fs, ext2_ino, ext2_inode);
1035 ret = copy_extended_attrs(trans, root, objectid, &btrfs_inode,
1040 inode_key.objectid = objectid;
1041 inode_key.offset = 0;
1042 btrfs_set_key_type(&inode_key, BTRFS_INODE_ITEM_KEY);
1043 ret = btrfs_insert_inode(trans, root, objectid, &btrfs_inode);
1047 static int copy_disk_extent(struct btrfs_root *root, u64 dst_bytenr,
1048 u64 src_bytenr, u32 num_bytes)
1052 struct btrfs_fs_devices *fs_devs = root->fs_info->fs_devices;
1054 buffer = malloc(num_bytes);
1057 ret = pread(fs_devs->latest_bdev, buffer, num_bytes, src_bytenr);
1058 if (ret != num_bytes)
1060 ret = pwrite(fs_devs->latest_bdev, buffer, num_bytes, dst_bytenr);
1061 if (ret != num_bytes)
1071 * scan ext2's inode bitmap and copy all used inodes.
1073 static int copy_inodes(struct btrfs_root *root, ext2_filsys ext2_fs,
1074 int datacsum, int packing, int noxattr, struct task_ctx *p)
1078 ext2_inode_scan ext2_scan;
1079 struct ext2_inode ext2_inode;
1080 ext2_ino_t ext2_ino;
1082 struct btrfs_trans_handle *trans;
1084 trans = btrfs_start_transaction(root, 1);
1087 err = ext2fs_open_inode_scan(ext2_fs, 0, &ext2_scan);
1089 fprintf(stderr, "ext2fs_open_inode_scan: %s\n", error_message(err));
1092 while (!(err = ext2fs_get_next_inode(ext2_scan, &ext2_ino,
1094 /* no more inodes */
1097 /* skip special inode in ext2fs */
1098 if (ext2_ino < EXT2_GOOD_OLD_FIRST_INO &&
1099 ext2_ino != EXT2_ROOT_INO)
1101 objectid = ext2_ino + INO_OFFSET;
1102 ret = copy_single_inode(trans, root,
1103 objectid, ext2_fs, ext2_ino,
1104 &ext2_inode, datacsum, packing,
1106 p->cur_copy_inodes++;
1109 if (trans->blocks_used >= 4096) {
1110 ret = btrfs_commit_transaction(trans, root);
1112 trans = btrfs_start_transaction(root, 1);
1117 fprintf(stderr, "ext2fs_get_next_inode: %s\n", error_message(err));
1120 ret = btrfs_commit_transaction(trans, root);
1127 * Construct a range of ext2fs image file.
1128 * scan block allocation bitmap, find all blocks used by the ext2fs
1129 * in this range and create file extents that point to these blocks.
1131 * Note: Before calling the function, no file extent points to blocks
1134 static int create_image_file_range(struct btrfs_trans_handle *trans,
1135 struct btrfs_root *root, u64 objectid,
1136 struct btrfs_inode_item *inode,
1137 u64 start_byte, u64 end_byte,
1138 ext2_filsys ext2_fs)
1140 u32 blocksize = ext2_fs->blocksize;
1141 u32 block = start_byte / blocksize;
1142 u32 last_block = (end_byte + blocksize - 1) / blocksize;
1144 struct blk_iterate_data data = {
1148 .objectid = objectid,
1149 .first_block = block,
1152 .boundary = (u64)-1,
1156 for (; start_byte < end_byte; block++, start_byte += blocksize) {
1157 if (!ext2fs_fast_test_block_bitmap(ext2_fs->block_map, block))
1159 ret = block_iterate_proc(NULL, block, block, &data);
1160 if (ret & BLOCK_ABORT) {
1165 if (data.num_blocks > 0) {
1166 ret = record_file_blocks(trans, root, objectid, inode,
1167 data.first_block, data.disk_block,
1168 data.num_blocks, 0);
1171 data.first_block += data.num_blocks;
1173 if (last_block > data.first_block) {
1174 ret = record_file_blocks(trans, root, objectid, inode,
1175 data.first_block, 0, last_block -
1176 data.first_block, 0);
1184 * Create the ext2fs image file.
1186 static int create_ext2_image(struct btrfs_root *root, ext2_filsys ext2_fs,
1190 struct btrfs_key key;
1191 struct btrfs_key location;
1192 struct btrfs_path path;
1193 struct btrfs_inode_item btrfs_inode;
1194 struct btrfs_inode_item *inode_item;
1195 struct extent_buffer *leaf;
1196 struct btrfs_fs_info *fs_info = root->fs_info;
1197 struct btrfs_root *extent_root = fs_info->extent_root;
1198 struct btrfs_trans_handle *trans;
1199 struct btrfs_extent_item *ei;
1200 struct btrfs_extent_inline_ref *iref;
1201 struct btrfs_extent_data_ref *dref;
1208 u32 sectorsize = root->sectorsize;
1210 total_bytes = btrfs_super_total_bytes(fs_info->super_copy);
1211 first_free = BTRFS_SUPER_INFO_OFFSET + sectorsize * 2 - 1;
1212 first_free &= ~((u64)sectorsize - 1);
1214 memset(&btrfs_inode, 0, sizeof(btrfs_inode));
1215 btrfs_set_stack_inode_generation(&btrfs_inode, 1);
1216 btrfs_set_stack_inode_size(&btrfs_inode, total_bytes);
1217 btrfs_set_stack_inode_nlink(&btrfs_inode, 1);
1218 btrfs_set_stack_inode_nbytes(&btrfs_inode, 0);
1219 btrfs_set_stack_inode_mode(&btrfs_inode, S_IFREG | 0400);
1220 btrfs_set_stack_inode_flags(&btrfs_inode, BTRFS_INODE_NODATASUM |
1221 BTRFS_INODE_READONLY);
1222 btrfs_init_path(&path);
1223 trans = btrfs_start_transaction(root, 1);
1226 objectid = btrfs_root_dirid(&root->root_item);
1227 ret = btrfs_find_free_objectid(trans, root, objectid, &objectid);
1232 * copy blocks covered by extent #0 to new positions. extent #0 is
1233 * special, we can't rely on relocate_extents_range to relocate it.
1235 for (last_byte = 0; last_byte < first_free; last_byte += sectorsize) {
1236 ret = custom_alloc_extent(root, sectorsize, 0, &key);
1239 ret = copy_disk_extent(root, key.objectid, last_byte,
1243 ret = btrfs_record_file_extent(trans, root, objectid,
1244 &btrfs_inode, last_byte,
1245 key.objectid, sectorsize);
1251 key.objectid = last_byte;
1253 btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY);
1254 ret = btrfs_search_slot(trans, fs_info->extent_root,
1259 leaf = path.nodes[0];
1260 if (path.slots[0] >= btrfs_header_nritems(leaf)) {
1261 ret = btrfs_next_leaf(extent_root, &path);
1266 leaf = path.nodes[0];
1268 btrfs_item_key_to_cpu(leaf, &key, path.slots[0]);
1269 if (last_byte > key.objectid ||
1270 key.type != BTRFS_EXTENT_ITEM_KEY) {
1275 bytenr = key.objectid;
1276 num_bytes = key.offset;
1277 ei = btrfs_item_ptr(leaf, path.slots[0],
1278 struct btrfs_extent_item);
1279 if (!(btrfs_extent_flags(leaf, ei) & BTRFS_EXTENT_FLAG_DATA)) {
1284 BUG_ON(btrfs_item_size_nr(leaf, path.slots[0]) != sizeof(*ei) +
1285 btrfs_extent_inline_ref_size(BTRFS_EXTENT_DATA_REF_KEY));
1287 iref = (struct btrfs_extent_inline_ref *)(ei + 1);
1288 key.type = btrfs_extent_inline_ref_type(leaf, iref);
1289 BUG_ON(key.type != BTRFS_EXTENT_DATA_REF_KEY);
1290 dref = (struct btrfs_extent_data_ref *)(&iref->offset);
1291 if (btrfs_extent_data_ref_root(leaf, dref) !=
1292 BTRFS_FS_TREE_OBJECTID) {
1297 if (bytenr > last_byte) {
1298 ret = create_image_file_range(trans, root, objectid,
1299 &btrfs_inode, last_byte,
1304 ret = btrfs_record_file_extent(trans, root, objectid,
1305 &btrfs_inode, bytenr, bytenr,
1309 last_byte = bytenr + num_bytes;
1310 btrfs_release_path(&path);
1312 if (trans->blocks_used >= 4096) {
1313 ret = btrfs_commit_transaction(trans, root);
1315 trans = btrfs_start_transaction(root, 1);
1319 btrfs_release_path(&path);
1320 if (total_bytes > last_byte) {
1321 ret = create_image_file_range(trans, root, objectid,
1322 &btrfs_inode, last_byte,
1323 total_bytes, ext2_fs);
1328 ret = btrfs_insert_inode(trans, root, objectid, &btrfs_inode);
1332 location.objectid = objectid;
1333 location.offset = 0;
1334 btrfs_set_key_type(&location, BTRFS_INODE_ITEM_KEY);
1335 ret = btrfs_insert_dir_item(trans, root, name, strlen(name),
1336 btrfs_root_dirid(&root->root_item),
1337 &location, EXT2_FT_REG_FILE, objectid);
1340 ret = btrfs_insert_inode_ref(trans, root, name, strlen(name),
1342 btrfs_root_dirid(&root->root_item),
1346 location.objectid = btrfs_root_dirid(&root->root_item);
1347 location.offset = 0;
1348 btrfs_set_key_type(&location, BTRFS_INODE_ITEM_KEY);
1349 ret = btrfs_lookup_inode(trans, root, &path, &location, 1);
1352 leaf = path.nodes[0];
1353 inode_item = btrfs_item_ptr(leaf, path.slots[0],
1354 struct btrfs_inode_item);
1355 btrfs_set_inode_size(leaf, inode_item, strlen(name) * 2 +
1356 btrfs_inode_size(leaf, inode_item));
1357 btrfs_mark_buffer_dirty(leaf);
1358 btrfs_release_path(&path);
1359 ret = btrfs_commit_transaction(trans, root);
1362 btrfs_release_path(&path);
1366 static struct btrfs_root * link_subvol(struct btrfs_root *root,
1367 const char *base, u64 root_objectid)
1369 struct btrfs_trans_handle *trans;
1370 struct btrfs_fs_info *fs_info = root->fs_info;
1371 struct btrfs_root *tree_root = fs_info->tree_root;
1372 struct btrfs_root *new_root = NULL;
1373 struct btrfs_path *path;
1374 struct btrfs_inode_item *inode_item;
1375 struct extent_buffer *leaf;
1376 struct btrfs_key key;
1377 u64 dirid = btrfs_root_dirid(&root->root_item);
1379 char buf[BTRFS_NAME_LEN + 1]; /* for snprintf null */
1385 if (len < 1 || len > BTRFS_NAME_LEN)
1388 path = btrfs_alloc_path();
1391 key.objectid = dirid;
1392 key.type = BTRFS_DIR_INDEX_KEY;
1393 key.offset = (u64)-1;
1395 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1398 if (path->slots[0] > 0) {
1400 btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
1401 if (key.objectid == dirid && key.type == BTRFS_DIR_INDEX_KEY)
1402 index = key.offset + 1;
1404 btrfs_release_path(path);
1406 trans = btrfs_start_transaction(root, 1);
1409 key.objectid = dirid;
1411 key.type = BTRFS_INODE_ITEM_KEY;
1413 ret = btrfs_lookup_inode(trans, root, path, &key, 1);
1415 leaf = path->nodes[0];
1416 inode_item = btrfs_item_ptr(leaf, path->slots[0],
1417 struct btrfs_inode_item);
1419 key.objectid = root_objectid;
1420 key.offset = (u64)-1;
1421 key.type = BTRFS_ROOT_ITEM_KEY;
1423 memcpy(buf, base, len);
1424 for (i = 0; i < 1024; i++) {
1425 ret = btrfs_insert_dir_item(trans, root, buf, len,
1426 dirid, &key, BTRFS_FT_DIR, index);
1429 len = snprintf(buf, ARRAY_SIZE(buf), "%s%d", base, i);
1430 if (len < 1 || len > BTRFS_NAME_LEN) {
1438 btrfs_set_inode_size(leaf, inode_item, len * 2 +
1439 btrfs_inode_size(leaf, inode_item));
1440 btrfs_mark_buffer_dirty(leaf);
1441 btrfs_release_path(path);
1443 /* add the backref first */
1444 ret = btrfs_add_root_ref(trans, tree_root, root_objectid,
1445 BTRFS_ROOT_BACKREF_KEY,
1446 root->root_key.objectid,
1447 dirid, index, buf, len);
1450 /* now add the forward ref */
1451 ret = btrfs_add_root_ref(trans, tree_root, root->root_key.objectid,
1452 BTRFS_ROOT_REF_KEY, root_objectid,
1453 dirid, index, buf, len);
1455 ret = btrfs_commit_transaction(trans, root);
1458 new_root = btrfs_read_fs_root(fs_info, &key);
1459 if (IS_ERR(new_root))
1462 btrfs_free_path(path);
1466 static int create_chunk_mapping(struct btrfs_trans_handle *trans,
1467 struct btrfs_root *root)
1469 struct btrfs_fs_info *info = root->fs_info;
1470 struct btrfs_root *chunk_root = info->chunk_root;
1471 struct btrfs_root *extent_root = info->extent_root;
1472 struct btrfs_device *device;
1473 struct btrfs_block_group_cache *cache;
1474 struct btrfs_dev_extent *extent;
1475 struct extent_buffer *leaf;
1476 struct btrfs_chunk chunk;
1477 struct btrfs_key key;
1478 struct btrfs_path path;
1484 btrfs_init_path(&path);
1486 total_bytes = btrfs_super_total_bytes(root->fs_info->super_copy);
1487 chunk_objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID;
1489 BUG_ON(list_empty(&info->fs_devices->devices));
1490 device = list_entry(info->fs_devices->devices.next,
1491 struct btrfs_device, dev_list);
1492 BUG_ON(device->devid != info->fs_devices->latest_devid);
1494 /* delete device extent created by make_btrfs */
1495 key.objectid = device->devid;
1497 key.type = BTRFS_DEV_EXTENT_KEY;
1498 ret = btrfs_search_slot(trans, device->dev_root, &key, &path, -1, 1);
1503 ret = btrfs_del_item(trans, device->dev_root, &path);
1506 btrfs_release_path(&path);
1508 /* delete chunk item created by make_btrfs */
1509 key.objectid = chunk_objectid;
1511 key.type = BTRFS_CHUNK_ITEM_KEY;
1512 ret = btrfs_search_slot(trans, chunk_root, &key, &path, -1, 1);
1517 ret = btrfs_del_item(trans, chunk_root, &path);
1520 btrfs_release_path(&path);
1522 /* for each block group, create device extent and chunk item */
1524 while (cur_start < total_bytes) {
1525 cache = btrfs_lookup_block_group(root->fs_info, cur_start);
1528 /* insert device extent */
1529 key.objectid = device->devid;
1530 key.offset = cache->key.objectid;
1531 key.type = BTRFS_DEV_EXTENT_KEY;
1532 ret = btrfs_insert_empty_item(trans, device->dev_root, &path,
1533 &key, sizeof(*extent));
1537 leaf = path.nodes[0];
1538 extent = btrfs_item_ptr(leaf, path.slots[0],
1539 struct btrfs_dev_extent);
1541 btrfs_set_dev_extent_chunk_tree(leaf, extent,
1542 chunk_root->root_key.objectid);
1543 btrfs_set_dev_extent_chunk_objectid(leaf, extent,
1545 btrfs_set_dev_extent_chunk_offset(leaf, extent,
1546 cache->key.objectid);
1547 btrfs_set_dev_extent_length(leaf, extent, cache->key.offset);
1548 write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid,
1549 (unsigned long)btrfs_dev_extent_chunk_tree_uuid(extent),
1551 btrfs_mark_buffer_dirty(leaf);
1552 btrfs_release_path(&path);
1554 /* insert chunk item */
1555 btrfs_set_stack_chunk_length(&chunk, cache->key.offset);
1556 btrfs_set_stack_chunk_owner(&chunk,
1557 extent_root->root_key.objectid);
1558 btrfs_set_stack_chunk_stripe_len(&chunk, BTRFS_STRIPE_LEN);
1559 btrfs_set_stack_chunk_type(&chunk, cache->flags);
1560 btrfs_set_stack_chunk_io_align(&chunk, device->io_align);
1561 btrfs_set_stack_chunk_io_width(&chunk, device->io_width);
1562 btrfs_set_stack_chunk_sector_size(&chunk, device->sector_size);
1563 btrfs_set_stack_chunk_num_stripes(&chunk, 1);
1564 btrfs_set_stack_chunk_sub_stripes(&chunk, 0);
1565 btrfs_set_stack_stripe_devid(&chunk.stripe, device->devid);
1566 btrfs_set_stack_stripe_offset(&chunk.stripe,
1567 cache->key.objectid);
1568 memcpy(&chunk.stripe.dev_uuid, device->uuid, BTRFS_UUID_SIZE);
1570 key.objectid = chunk_objectid;
1571 key.offset = cache->key.objectid;
1572 key.type = BTRFS_CHUNK_ITEM_KEY;
1574 ret = btrfs_insert_item(trans, chunk_root, &key, &chunk,
1575 btrfs_chunk_item_size(1));
1579 cur_start = cache->key.objectid + cache->key.offset;
1582 device->bytes_used = total_bytes;
1583 ret = btrfs_update_device(trans, device);
1585 btrfs_release_path(&path);
1589 static int create_subvol(struct btrfs_trans_handle *trans,
1590 struct btrfs_root *root, u64 root_objectid)
1592 struct extent_buffer *tmp;
1593 struct btrfs_root *new_root;
1594 struct btrfs_key key;
1595 struct btrfs_root_item root_item;
1598 ret = btrfs_copy_root(trans, root, root->node, &tmp,
1602 memcpy(&root_item, &root->root_item, sizeof(root_item));
1603 btrfs_set_root_bytenr(&root_item, tmp->start);
1604 btrfs_set_root_level(&root_item, btrfs_header_level(tmp));
1605 btrfs_set_root_generation(&root_item, trans->transid);
1606 free_extent_buffer(tmp);
1608 key.objectid = root_objectid;
1609 key.type = BTRFS_ROOT_ITEM_KEY;
1610 key.offset = trans->transid;
1611 ret = btrfs_insert_root(trans, root->fs_info->tree_root,
1614 key.offset = (u64)-1;
1615 new_root = btrfs_read_fs_root(root->fs_info, &key);
1616 BUG_ON(!new_root || IS_ERR(new_root));
1618 ret = btrfs_make_root_dir(trans, new_root, BTRFS_FIRST_FREE_OBJECTID);
1624 static int init_btrfs(struct btrfs_root *root)
1627 struct btrfs_key location;
1628 struct btrfs_trans_handle *trans;
1629 struct btrfs_fs_info *fs_info = root->fs_info;
1630 struct extent_buffer *tmp;
1632 trans = btrfs_start_transaction(root, 1);
1634 ret = btrfs_make_block_groups(trans, root);
1637 ret = btrfs_fix_block_accounting(trans, root);
1640 ret = create_chunk_mapping(trans, root);
1643 ret = btrfs_make_root_dir(trans, fs_info->tree_root,
1644 BTRFS_ROOT_TREE_DIR_OBJECTID);
1647 memcpy(&location, &root->root_key, sizeof(location));
1648 location.offset = (u64)-1;
1649 ret = btrfs_insert_dir_item(trans, fs_info->tree_root, "default", 7,
1650 btrfs_super_root_dir(fs_info->super_copy),
1651 &location, BTRFS_FT_DIR, 0);
1654 ret = btrfs_insert_inode_ref(trans, fs_info->tree_root, "default", 7,
1656 btrfs_super_root_dir(fs_info->super_copy), 0);
1659 btrfs_set_root_dirid(&fs_info->fs_root->root_item,
1660 BTRFS_FIRST_FREE_OBJECTID);
1662 /* subvol for ext2 image file */
1663 ret = create_subvol(trans, root, EXT2_IMAGE_SUBVOL_OBJECTID);
1665 /* subvol for data relocation */
1666 ret = create_subvol(trans, root, BTRFS_DATA_RELOC_TREE_OBJECTID);
1669 extent_buffer_get(fs_info->csum_root->node);
1670 ret = __btrfs_cow_block(trans, fs_info->csum_root,
1671 fs_info->csum_root->node, NULL, 0, &tmp, 0, 0);
1673 free_extent_buffer(tmp);
1675 ret = btrfs_commit_transaction(trans, root);
1682 * Migrate super block to its default position and zero 0 ~ 16k
1684 static int migrate_super_block(int fd, u64 old_bytenr, u32 sectorsize)
1687 struct extent_buffer *buf;
1688 struct btrfs_super_block *super;
1692 BUG_ON(sectorsize < sizeof(*super));
1693 buf = malloc(sizeof(*buf) + sectorsize);
1697 buf->len = sectorsize;
1698 ret = pread(fd, buf->data, sectorsize, old_bytenr);
1699 if (ret != sectorsize)
1702 super = (struct btrfs_super_block *)buf->data;
1703 BUG_ON(btrfs_super_bytenr(super) != old_bytenr);
1704 btrfs_set_super_bytenr(super, BTRFS_SUPER_INFO_OFFSET);
1706 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
1707 ret = pwrite(fd, buf->data, sectorsize, BTRFS_SUPER_INFO_OFFSET);
1708 if (ret != sectorsize)
1715 memset(buf->data, 0, sectorsize);
1716 for (bytenr = 0; bytenr < BTRFS_SUPER_INFO_OFFSET; ) {
1717 len = BTRFS_SUPER_INFO_OFFSET - bytenr;
1718 if (len > sectorsize)
1720 ret = pwrite(fd, buf->data, len, bytenr);
1722 fprintf(stderr, "unable to zero fill device\n");
1736 static int prepare_system_chunk_sb(struct btrfs_super_block *super)
1738 struct btrfs_chunk *chunk;
1739 struct btrfs_disk_key *key;
1740 u32 sectorsize = btrfs_super_sectorsize(super);
1742 key = (struct btrfs_disk_key *)(super->sys_chunk_array);
1743 chunk = (struct btrfs_chunk *)(super->sys_chunk_array +
1744 sizeof(struct btrfs_disk_key));
1746 btrfs_set_disk_key_objectid(key, BTRFS_FIRST_CHUNK_TREE_OBJECTID);
1747 btrfs_set_disk_key_type(key, BTRFS_CHUNK_ITEM_KEY);
1748 btrfs_set_disk_key_offset(key, 0);
1750 btrfs_set_stack_chunk_length(chunk, btrfs_super_total_bytes(super));
1751 btrfs_set_stack_chunk_owner(chunk, BTRFS_EXTENT_TREE_OBJECTID);
1752 btrfs_set_stack_chunk_stripe_len(chunk, BTRFS_STRIPE_LEN);
1753 btrfs_set_stack_chunk_type(chunk, BTRFS_BLOCK_GROUP_SYSTEM);
1754 btrfs_set_stack_chunk_io_align(chunk, sectorsize);
1755 btrfs_set_stack_chunk_io_width(chunk, sectorsize);
1756 btrfs_set_stack_chunk_sector_size(chunk, sectorsize);
1757 btrfs_set_stack_chunk_num_stripes(chunk, 1);
1758 btrfs_set_stack_chunk_sub_stripes(chunk, 0);
1759 chunk->stripe.devid = super->dev_item.devid;
1760 btrfs_set_stack_stripe_offset(&chunk->stripe, 0);
1761 memcpy(chunk->stripe.dev_uuid, super->dev_item.uuid, BTRFS_UUID_SIZE);
1762 btrfs_set_super_sys_array_size(super, sizeof(*key) + sizeof(*chunk));
1766 static int prepare_system_chunk(int fd, u64 sb_bytenr, u32 sectorsize)
1769 struct extent_buffer *buf;
1770 struct btrfs_super_block *super;
1772 BUG_ON(sectorsize < sizeof(*super));
1773 buf = malloc(sizeof(*buf) + sectorsize);
1777 buf->len = sectorsize;
1778 ret = pread(fd, buf->data, sectorsize, sb_bytenr);
1779 if (ret != sectorsize)
1782 super = (struct btrfs_super_block *)buf->data;
1783 BUG_ON(btrfs_super_bytenr(super) != sb_bytenr);
1784 BUG_ON(btrfs_super_num_devices(super) != 1);
1786 ret = prepare_system_chunk_sb(super);
1790 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
1791 ret = pwrite(fd, buf->data, sectorsize, sb_bytenr);
1792 if (ret != sectorsize)
1803 static int relocate_one_reference(struct btrfs_trans_handle *trans,
1804 struct btrfs_root *root,
1805 u64 extent_start, u64 extent_size,
1806 struct btrfs_key *extent_key,
1807 struct extent_io_tree *reloc_tree)
1809 struct extent_buffer *leaf;
1810 struct btrfs_file_extent_item *fi;
1811 struct btrfs_key key;
1812 struct btrfs_path path;
1813 struct btrfs_inode_item inode;
1814 struct blk_iterate_data data;
1821 u32 sectorsize = root->sectorsize;
1827 btrfs_init_path(&path);
1828 ret = btrfs_search_slot(trans, root, extent_key, &path, -1, 1);
1832 leaf = path.nodes[0];
1833 fi = btrfs_item_ptr(leaf, path.slots[0],
1834 struct btrfs_file_extent_item);
1835 BUG_ON(btrfs_file_extent_offset(leaf, fi) > 0);
1836 if (extent_start != btrfs_file_extent_disk_bytenr(leaf, fi) ||
1837 extent_size != btrfs_file_extent_disk_num_bytes(leaf, fi)) {
1842 bytenr = extent_start + btrfs_file_extent_offset(leaf, fi);
1843 num_bytes = btrfs_file_extent_num_bytes(leaf, fi);
1845 ret = btrfs_del_item(trans, root, &path);
1849 ret = btrfs_free_extent(trans, root, extent_start, extent_size, 0,
1850 root->root_key.objectid,
1851 extent_key->objectid, extent_key->offset);
1855 btrfs_release_path(&path);
1857 key.objectid = extent_key->objectid;
1859 key.type = BTRFS_INODE_ITEM_KEY;
1860 ret = btrfs_lookup_inode(trans, root, &path, &key, 0);
1864 leaf = path.nodes[0];
1865 ptr = btrfs_item_ptr_offset(leaf, path.slots[0]);
1866 read_extent_buffer(leaf, &inode, ptr, sizeof(inode));
1867 btrfs_release_path(&path);
1869 BUG_ON(num_bytes & (sectorsize - 1));
1870 nbytes = btrfs_stack_inode_nbytes(&inode) - num_bytes;
1871 btrfs_set_stack_inode_nbytes(&inode, nbytes);
1872 datacsum = !(btrfs_stack_inode_flags(&inode) & BTRFS_INODE_NODATASUM);
1874 data = (struct blk_iterate_data) {
1878 .objectid = extent_key->objectid,
1879 .first_block = extent_key->offset / sectorsize,
1882 .boundary = (u64)-1,
1883 .checksum = datacsum,
1887 cur_offset = extent_key->offset;
1888 while (num_bytes > 0) {
1889 sector_end = bytenr + sectorsize - 1;
1890 if (test_range_bit(reloc_tree, bytenr, sector_end,
1891 EXTENT_LOCKED, 1)) {
1892 ret = get_state_private(reloc_tree, bytenr, &new_pos);
1895 ret = custom_alloc_extent(root, sectorsize, 0, &key);
1898 new_pos = key.objectid;
1900 if (cur_offset == extent_key->offset) {
1901 fd = root->fs_info->fs_devices->latest_bdev;
1902 readahead(fd, bytenr, num_bytes);
1904 ret = copy_disk_extent(root, new_pos, bytenr,
1908 ret = set_extent_bits(reloc_tree, bytenr, sector_end,
1909 EXTENT_LOCKED, GFP_NOFS);
1911 ret = set_state_private(reloc_tree, bytenr, new_pos);
1915 ret = block_iterate_proc(NULL, new_pos / sectorsize,
1916 cur_offset / sectorsize, &data);
1917 if (ret & BLOCK_ABORT) {
1922 cur_offset += sectorsize;
1923 bytenr += sectorsize;
1924 num_bytes -= sectorsize;
1927 if (data.num_blocks > 0) {
1928 ret = record_file_blocks(trans, root,
1929 extent_key->objectid, &inode,
1930 data.first_block, data.disk_block,
1931 data.num_blocks, datacsum);
1936 key.objectid = extent_key->objectid;
1938 key.type = BTRFS_INODE_ITEM_KEY;
1939 ret = btrfs_lookup_inode(trans, root, &path, &key, 1);
1943 leaf = path.nodes[0];
1944 ptr = btrfs_item_ptr_offset(leaf, path.slots[0]);
1945 write_extent_buffer(leaf, &inode, ptr, sizeof(inode));
1946 btrfs_mark_buffer_dirty(leaf);
1947 btrfs_release_path(&path);
1950 btrfs_release_path(&path);
1954 static int relocate_extents_range(struct btrfs_root *fs_root,
1955 struct btrfs_root *ext2_root,
1956 u64 start_byte, u64 end_byte)
1958 struct btrfs_fs_info *info = fs_root->fs_info;
1959 struct btrfs_root *extent_root = info->extent_root;
1960 struct btrfs_root *cur_root = NULL;
1961 struct btrfs_trans_handle *trans;
1962 struct btrfs_extent_data_ref *dref;
1963 struct btrfs_extent_inline_ref *iref;
1964 struct btrfs_extent_item *ei;
1965 struct extent_buffer *leaf;
1966 struct btrfs_key key;
1967 struct btrfs_key extent_key;
1968 struct btrfs_path path;
1969 struct extent_io_tree reloc_tree;
1979 btrfs_init_path(&path);
1980 extent_io_tree_init(&reloc_tree);
1982 key.objectid = start_byte;
1984 key.type = BTRFS_EXTENT_ITEM_KEY;
1985 ret = btrfs_search_slot(NULL, extent_root, &key, &path, 0, 0);
1989 ret = btrfs_previous_item(extent_root, &path, 0,
1990 BTRFS_EXTENT_ITEM_KEY);
1994 leaf = path.nodes[0];
1995 btrfs_item_key_to_cpu(leaf, &key, path.slots[0]);
1996 if (key.objectid + key.offset > start_byte)
1997 start_byte = key.objectid;
2000 btrfs_release_path(&path);
2002 cur_root = (pass % 2 == 0) ? ext2_root : fs_root;
2005 trans = btrfs_start_transaction(cur_root, 1);
2008 cur_byte = start_byte;
2010 key.objectid = cur_byte;
2012 key.type = BTRFS_EXTENT_ITEM_KEY;
2013 ret = btrfs_search_slot(trans, extent_root,
2018 leaf = path.nodes[0];
2019 if (path.slots[0] >= btrfs_header_nritems(leaf)) {
2020 ret = btrfs_next_leaf(extent_root, &path);
2025 leaf = path.nodes[0];
2028 btrfs_item_key_to_cpu(leaf, &key, path.slots[0]);
2029 if (key.objectid < cur_byte ||
2030 key.type != BTRFS_EXTENT_ITEM_KEY) {
2034 if (key.objectid >= end_byte)
2039 cur_byte = key.objectid;
2040 num_bytes = key.offset;
2041 ei = btrfs_item_ptr(leaf, path.slots[0],
2042 struct btrfs_extent_item);
2043 BUG_ON(!(btrfs_extent_flags(leaf, ei) &
2044 BTRFS_EXTENT_FLAG_DATA));
2046 ptr = btrfs_item_ptr_offset(leaf, path.slots[0]);
2047 end = ptr + btrfs_item_size_nr(leaf, path.slots[0]);
2049 ptr += sizeof(struct btrfs_extent_item);
2052 iref = (struct btrfs_extent_inline_ref *)ptr;
2053 key.type = btrfs_extent_inline_ref_type(leaf, iref);
2054 BUG_ON(key.type != BTRFS_EXTENT_DATA_REF_KEY);
2055 dref = (struct btrfs_extent_data_ref *)(&iref->offset);
2056 ref_root = btrfs_extent_data_ref_root(leaf, dref);
2057 extent_key.objectid =
2058 btrfs_extent_data_ref_objectid(leaf, dref);
2060 btrfs_extent_data_ref_offset(leaf, dref);
2061 extent_key.type = BTRFS_EXTENT_DATA_KEY;
2062 BUG_ON(btrfs_extent_data_ref_count(leaf, dref) != 1);
2064 if (ref_root == cur_root->root_key.objectid)
2067 ptr += btrfs_extent_inline_ref_size(key.type);
2075 ret = relocate_one_reference(trans, cur_root, cur_byte,
2076 num_bytes, &extent_key,
2081 cur_byte += num_bytes;
2082 btrfs_release_path(&path);
2084 if (trans->blocks_used >= 4096) {
2085 ret = btrfs_commit_transaction(trans, cur_root);
2087 trans = btrfs_start_transaction(cur_root, 1);
2091 btrfs_release_path(&path);
2093 ret = btrfs_commit_transaction(trans, cur_root);
2096 if (num_extents > 0 && pass++ < 16)
2099 ret = (num_extents > 0) ? -1 : 0;
2101 btrfs_release_path(&path);
2102 extent_io_tree_cleanup(&reloc_tree);
2107 * relocate data in system chunk
2109 static int cleanup_sys_chunk(struct btrfs_root *fs_root,
2110 struct btrfs_root *ext2_root)
2112 struct btrfs_block_group_cache *cache;
2118 cache = btrfs_lookup_block_group(fs_root->fs_info, offset);
2122 end_byte = cache->key.objectid + cache->key.offset;
2123 if (cache->flags & BTRFS_BLOCK_GROUP_SYSTEM) {
2124 ret = relocate_extents_range(fs_root, ext2_root,
2125 cache->key.objectid,
2132 for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
2133 offset = btrfs_sb_offset(i);
2134 offset &= ~((u64)BTRFS_STRIPE_LEN - 1);
2136 ret = relocate_extents_range(fs_root, ext2_root,
2137 offset, offset + BTRFS_STRIPE_LEN);
2146 static int fixup_chunk_mapping(struct btrfs_root *root)
2148 struct btrfs_trans_handle *trans;
2149 struct btrfs_fs_info *info = root->fs_info;
2150 struct btrfs_root *chunk_root = info->chunk_root;
2151 struct extent_buffer *leaf;
2152 struct btrfs_key key;
2153 struct btrfs_path path;
2154 struct btrfs_chunk chunk;
2160 btrfs_init_path(&path);
2162 trans = btrfs_start_transaction(root, 1);
2166 * recow the whole chunk tree. this will move all chunk tree blocks
2167 * into system block group.
2169 memset(&key, 0, sizeof(key));
2171 ret = btrfs_search_slot(trans, chunk_root, &key, &path, 0, 1);
2175 ret = btrfs_next_leaf(chunk_root, &path);
2181 btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]);
2182 btrfs_release_path(&path);
2184 btrfs_release_path(&path);
2186 /* fixup the system chunk array in super block */
2187 btrfs_set_super_sys_array_size(info->super_copy, 0);
2189 key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID;
2191 key.type = BTRFS_CHUNK_ITEM_KEY;
2193 ret = btrfs_search_slot(trans, chunk_root, &key, &path, 0, 0);
2198 leaf = path.nodes[0];
2199 if (path.slots[0] >= btrfs_header_nritems(leaf)) {
2200 ret = btrfs_next_leaf(chunk_root, &path);
2205 leaf = path.nodes[0];
2207 btrfs_item_key_to_cpu(leaf, &key, path.slots[0]);
2208 if (key.type != BTRFS_CHUNK_ITEM_KEY)
2211 ptr = btrfs_item_ptr_offset(leaf, path.slots[0]);
2212 size = btrfs_item_size_nr(leaf, path.slots[0]);
2213 BUG_ON(size != sizeof(chunk));
2214 read_extent_buffer(leaf, &chunk, ptr, size);
2215 type = btrfs_stack_chunk_type(&chunk);
2217 if (!(type & BTRFS_BLOCK_GROUP_SYSTEM))
2220 ret = btrfs_add_system_chunk(trans, chunk_root, &key,
2228 ret = btrfs_commit_transaction(trans, root);
2231 btrfs_release_path(&path);
2235 static int do_convert(const char *devname, int datacsum, int packing, int noxattr,
2236 int copylabel, const char *fslabel, int progress)
2244 ext2_filsys ext2_fs;
2245 struct btrfs_root *root;
2246 struct btrfs_root *ext2_root;
2247 struct task_ctx ctx;
2249 ret = open_ext2fs(devname, &ext2_fs);
2251 fprintf(stderr, "unable to open the Ext2fs\n");
2254 blocksize = ext2_fs->blocksize;
2255 total_bytes = (u64)ext2_fs->super->s_blocks_count * blocksize;
2256 if (blocksize < 4096) {
2257 fprintf(stderr, "block size is too small\n");
2260 if (!(ext2_fs->super->s_feature_incompat &
2261 EXT2_FEATURE_INCOMPAT_FILETYPE)) {
2262 fprintf(stderr, "filetype feature is missing\n");
2265 for (i = 0; i < 7; i++) {
2266 ret = ext2_alloc_block(ext2_fs, 0, blocks + i);
2268 fprintf(stderr, "not enough free space\n");
2271 blocks[i] *= blocksize;
2273 super_bytenr = blocks[0];
2274 fd = open(devname, O_RDWR);
2276 fprintf(stderr, "unable to open %s\n", devname);
2279 ret = make_btrfs(fd, devname, ext2_fs->super->s_volume_name,
2280 NULL, blocks, total_bytes, blocksize, blocksize,
2281 blocksize, blocksize, 0);
2283 fprintf(stderr, "unable to create initial ctree: %s\n",
2287 /* create a system chunk that maps the whole device */
2288 ret = prepare_system_chunk(fd, super_bytenr, blocksize);
2290 fprintf(stderr, "unable to update system chunk\n");
2293 root = open_ctree_fd(fd, devname, super_bytenr, OPEN_CTREE_WRITES);
2295 fprintf(stderr, "unable to open ctree\n");
2298 ret = cache_free_extents(root, ext2_fs);
2300 fprintf(stderr, "error during cache_free_extents %d\n", ret);
2303 root->fs_info->extent_ops = &extent_ops;
2304 /* recover block allocation bitmap */
2305 for (i = 0; i < 7; i++) {
2306 blocks[i] /= blocksize;
2307 ext2_free_block(ext2_fs, blocks[i]);
2309 ret = init_btrfs(root);
2311 fprintf(stderr, "unable to setup the root tree\n");
2314 printf("creating btrfs metadata.\n");
2315 ctx.max_copy_inodes = (ext2_fs->super->s_inodes_count
2316 - ext2_fs->super->s_free_inodes_count);
2317 ctx.cur_copy_inodes = 0;
2320 ctx.info = task_init(print_copied_inodes, after_copied_inodes, &ctx);
2321 task_start(ctx.info);
2323 ret = copy_inodes(root, ext2_fs, datacsum, packing, noxattr, &ctx);
2325 fprintf(stderr, "error during copy_inodes %d\n", ret);
2329 task_stop(ctx.info);
2330 task_deinit(ctx.info);
2332 printf("creating ext2fs image file.\n");
2333 ext2_root = link_subvol(root, "ext2_saved", EXT2_IMAGE_SUBVOL_OBJECTID);
2335 fprintf(stderr, "unable to create subvol\n");
2338 ret = create_ext2_image(ext2_root, ext2_fs, "image");
2340 fprintf(stderr, "error during create_ext2_image %d\n", ret);
2343 memset(root->fs_info->super_copy->label, 0, BTRFS_LABEL_SIZE);
2344 if (copylabel == 1) {
2345 strncpy(root->fs_info->super_copy->label,
2346 ext2_fs->super->s_volume_name, 16);
2347 fprintf(stderr, "copy label '%s'\n",
2348 root->fs_info->super_copy->label);
2349 } else if (copylabel == -1) {
2350 strncpy(root->fs_info->super_copy->label, fslabel, BTRFS_LABEL_SIZE);
2351 fprintf(stderr, "set label to '%s'\n", fslabel);
2354 printf("cleaning up system chunk.\n");
2355 ret = cleanup_sys_chunk(root, ext2_root);
2357 fprintf(stderr, "error during cleanup_sys_chunk %d\n", ret);
2360 ret = close_ctree(root);
2362 fprintf(stderr, "error during close_ctree %d\n", ret);
2365 close_ext2fs(ext2_fs);
2368 * If this step succeed, we get a mountable btrfs. Otherwise
2369 * the ext2fs is left unchanged.
2371 ret = migrate_super_block(fd, super_bytenr, blocksize);
2373 fprintf(stderr, "unable to migrate super block\n");
2377 root = open_ctree_fd(fd, devname, 0, OPEN_CTREE_WRITES);
2379 fprintf(stderr, "unable to open ctree\n");
2382 /* move chunk tree into system chunk. */
2383 ret = fixup_chunk_mapping(root);
2385 fprintf(stderr, "error during fixup_chunk_tree\n");
2388 ret = close_ctree(root);
2391 printf("conversion complete.\n");
2396 fprintf(stderr, "conversion aborted.\n");
2400 static int may_rollback(struct btrfs_root *root)
2402 struct btrfs_fs_info *info = root->fs_info;
2403 struct btrfs_multi_bio *multi = NULL;
2411 if (btrfs_super_num_devices(info->super_copy) != 1)
2414 bytenr = BTRFS_SUPER_INFO_OFFSET;
2415 total_bytes = btrfs_super_total_bytes(root->fs_info->super_copy);
2418 ret = btrfs_map_block(&info->mapping_tree, WRITE, bytenr,
2419 &length, &multi, 0, NULL);
2421 if (ret == -ENOENT) {
2422 /* removed block group at the tail */
2423 if (length == (u64)-1)
2426 /* removed block group in the middle */
2432 num_stripes = multi->num_stripes;
2433 physical = multi->stripes[0].physical;
2436 if (num_stripes != 1 || physical != bytenr)
2440 if (bytenr >= total_bytes)
2448 static int do_rollback(const char *devname)
2453 struct btrfs_root *root;
2454 struct btrfs_root *ext2_root;
2455 struct btrfs_root *chunk_root;
2456 struct btrfs_dir_item *dir;
2457 struct btrfs_inode_item *inode;
2458 struct btrfs_file_extent_item *fi;
2459 struct btrfs_trans_handle *trans;
2460 struct extent_buffer *leaf;
2461 struct btrfs_block_group_cache *cache1;
2462 struct btrfs_block_group_cache *cache2;
2463 struct btrfs_key key;
2464 struct btrfs_path path;
2465 struct extent_io_tree io_tree;
2480 extent_io_tree_init(&io_tree);
2482 fd = open(devname, O_RDWR);
2484 fprintf(stderr, "unable to open %s\n", devname);
2487 root = open_ctree_fd(fd, devname, 0, OPEN_CTREE_WRITES);
2489 fprintf(stderr, "unable to open ctree\n");
2492 ret = may_rollback(root);
2494 fprintf(stderr, "unable to do rollback\n");
2498 sectorsize = root->sectorsize;
2499 buf = malloc(sectorsize);
2501 fprintf(stderr, "unable to allocate memory\n");
2505 btrfs_init_path(&path);
2507 key.objectid = EXT2_IMAGE_SUBVOL_OBJECTID;
2508 key.type = BTRFS_ROOT_ITEM_KEY;
2509 key.offset = (u64)-1;
2510 ext2_root = btrfs_read_fs_root(root->fs_info, &key);
2511 if (!ext2_root || IS_ERR(ext2_root)) {
2512 fprintf(stderr, "unable to open subvol %llu\n",
2513 (unsigned long long)key.objectid);
2518 root_dir = btrfs_root_dirid(&root->root_item);
2519 dir = btrfs_lookup_dir_item(NULL, ext2_root, &path,
2520 root_dir, name, strlen(name), 0);
2521 if (!dir || IS_ERR(dir)) {
2522 fprintf(stderr, "unable to find file %s\n", name);
2525 leaf = path.nodes[0];
2526 btrfs_dir_item_key_to_cpu(leaf, dir, &key);
2527 btrfs_release_path(&path);
2529 objectid = key.objectid;
2531 ret = btrfs_lookup_inode(NULL, ext2_root, &path, &key, 0);
2533 fprintf(stderr, "unable to find inode item\n");
2536 leaf = path.nodes[0];
2537 inode = btrfs_item_ptr(leaf, path.slots[0], struct btrfs_inode_item);
2538 total_bytes = btrfs_inode_size(leaf, inode);
2539 btrfs_release_path(&path);
2541 key.objectid = objectid;
2543 btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY);
2544 ret = btrfs_search_slot(NULL, ext2_root, &key, &path, 0, 0);
2546 fprintf(stderr, "unable to find first file extent\n");
2547 btrfs_release_path(&path);
2551 /* build mapping tree for the relocated blocks */
2552 for (offset = 0; offset < total_bytes; ) {
2553 leaf = path.nodes[0];
2554 if (path.slots[0] >= btrfs_header_nritems(leaf)) {
2555 ret = btrfs_next_leaf(root, &path);
2561 btrfs_item_key_to_cpu(leaf, &key, path.slots[0]);
2562 if (key.objectid != objectid || key.offset != offset ||
2563 btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY)
2566 fi = btrfs_item_ptr(leaf, path.slots[0],
2567 struct btrfs_file_extent_item);
2568 if (btrfs_file_extent_type(leaf, fi) != BTRFS_FILE_EXTENT_REG)
2570 if (btrfs_file_extent_compression(leaf, fi) ||
2571 btrfs_file_extent_encryption(leaf, fi) ||
2572 btrfs_file_extent_other_encoding(leaf, fi))
2575 bytenr = btrfs_file_extent_disk_bytenr(leaf, fi);
2576 /* skip holes and direct mapped extents */
2577 if (bytenr == 0 || bytenr == offset)
2580 bytenr += btrfs_file_extent_offset(leaf, fi);
2581 num_bytes = btrfs_file_extent_num_bytes(leaf, fi);
2583 cache1 = btrfs_lookup_block_group(root->fs_info, offset);
2584 cache2 = btrfs_lookup_block_group(root->fs_info,
2585 offset + num_bytes - 1);
2586 if (!cache1 || cache1 != cache2 ||
2587 (!(cache1->flags & BTRFS_BLOCK_GROUP_SYSTEM) &&
2588 !intersect_with_sb(offset, num_bytes)))
2591 set_extent_bits(&io_tree, offset, offset + num_bytes - 1,
2592 EXTENT_LOCKED, GFP_NOFS);
2593 set_state_private(&io_tree, offset, bytenr);
2595 offset += btrfs_file_extent_num_bytes(leaf, fi);
2598 btrfs_release_path(&path);
2600 if (offset < total_bytes) {
2601 fprintf(stderr, "unable to build extent mapping\n");
2605 first_free = BTRFS_SUPER_INFO_OFFSET + 2 * sectorsize - 1;
2606 first_free &= ~((u64)sectorsize - 1);
2607 /* backup for extent #0 should exist */
2608 if(!test_range_bit(&io_tree, 0, first_free - 1, EXTENT_LOCKED, 1)) {
2609 fprintf(stderr, "no backup for the first extent\n");
2612 /* force no allocation from system block group */
2613 root->fs_info->system_allocs = -1;
2614 trans = btrfs_start_transaction(root, 1);
2617 * recow the whole chunk tree, this will remove all chunk tree blocks
2618 * from system block group
2620 chunk_root = root->fs_info->chunk_root;
2621 memset(&key, 0, sizeof(key));
2623 ret = btrfs_search_slot(trans, chunk_root, &key, &path, 0, 1);
2627 ret = btrfs_next_leaf(chunk_root, &path);
2631 btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]);
2632 btrfs_release_path(&path);
2634 btrfs_release_path(&path);
2639 cache1 = btrfs_lookup_block_group(root->fs_info, offset);
2643 if (cache1->flags & BTRFS_BLOCK_GROUP_SYSTEM)
2644 num_bytes += btrfs_block_group_used(&cache1->item);
2646 offset = cache1->key.objectid + cache1->key.offset;
2648 /* only extent #0 left in system block group? */
2649 if (num_bytes > first_free) {
2650 fprintf(stderr, "unable to empty system block group\n");
2653 /* create a system chunk that maps the whole device */
2654 ret = prepare_system_chunk_sb(root->fs_info->super_copy);
2656 fprintf(stderr, "unable to update system chunk\n");
2660 ret = btrfs_commit_transaction(trans, root);
2663 ret = close_ctree(root);
2665 fprintf(stderr, "error during close_ctree %d\n", ret);
2669 /* zero btrfs super block mirrors */
2670 memset(buf, 0, sectorsize);
2671 for (i = 1 ; i < BTRFS_SUPER_MIRROR_MAX; i++) {
2672 bytenr = btrfs_sb_offset(i);
2673 if (bytenr >= total_bytes)
2675 ret = pwrite(fd, buf, sectorsize, bytenr);
2676 if (ret != sectorsize) {
2678 "error during zeroing supreblock %d: %d\n",
2684 sb_bytenr = (u64)-1;
2685 /* copy all relocated blocks back */
2687 ret = find_first_extent_bit(&io_tree, 0, &start, &end,
2692 ret = get_state_private(&io_tree, start, &bytenr);
2695 clear_extent_bits(&io_tree, start, end, EXTENT_LOCKED,
2698 while (start <= end) {
2699 if (start == BTRFS_SUPER_INFO_OFFSET) {
2703 ret = pread(fd, buf, sectorsize, bytenr);
2705 fprintf(stderr, "error during pread %d\n", ret);
2708 BUG_ON(ret != sectorsize);
2709 ret = pwrite(fd, buf, sectorsize, start);
2711 fprintf(stderr, "error during pwrite %d\n", ret);
2714 BUG_ON(ret != sectorsize);
2716 start += sectorsize;
2717 bytenr += sectorsize;
2723 fprintf(stderr, "error during fsync %d\n", ret);
2727 * finally, overwrite btrfs super block.
2729 ret = pread(fd, buf, sectorsize, sb_bytenr);
2731 fprintf(stderr, "error during pread %d\n", ret);
2734 BUG_ON(ret != sectorsize);
2735 ret = pwrite(fd, buf, sectorsize, BTRFS_SUPER_INFO_OFFSET);
2737 fprintf(stderr, "error during pwrite %d\n", ret);
2740 BUG_ON(ret != sectorsize);
2743 fprintf(stderr, "error during fsync %d\n", ret);
2749 extent_io_tree_cleanup(&io_tree);
2750 printf("rollback complete.\n");
2757 fprintf(stderr, "rollback aborted.\n");
2761 static void print_usage(void)
2763 printf("usage: btrfs-convert [options] device\n");
2764 printf("\t-d disable data checksum\n");
2765 printf("\t-i ignore xattrs and ACLs\n");
2766 printf("\t-n disable packing of small files\n");
2767 printf("\t-r roll back to ext2fs\n");
2768 printf("\t-l LABEL set filesystem label\n");
2769 printf("\t-L use label from converted fs\n");
2770 printf("\t-p show converting progress (default)\n");
2771 printf("\t--no-progress show only overview, not the detailed progress\n");
2774 int main(int argc, char *argv[])
2782 int usage_error = 0;
2785 char *fslabel = NULL;
2789 enum { GETOPT_VAL_NO_PROGRESS = 256 };
2790 static const struct option long_options[] = {
2791 { "no-progress", no_argument, NULL, GETOPT_VAL_IEC},
2792 { NULL, 0, NULL, 0 }
2794 int c = getopt_long(argc, argv, "dinrl:Lp", long_options,
2814 fslabel = strdup(optarg);
2815 if (strlen(fslabel) > BTRFS_LABEL_SIZE) {
2817 "warning: label too long, trimmed to %d bytes\n",
2819 fslabel[BTRFS_LABEL_SIZE] = 0;
2828 case GETOPT_VAL_NO_PROGRESS:
2836 argc = argc - optind;
2838 if (check_argc_exact(argc, 1)) {
2843 if (rollback && (!datacsum || noxattr || !packing)) {
2845 "Usage error: -d, -i, -n options do not apply to rollback\n");
2854 file = argv[optind];
2855 ret = check_mounted(file);
2857 fprintf(stderr, "Could not check mount status: %s\n",
2861 fprintf(stderr, "%s is mounted\n", file);
2866 ret = do_rollback(file);
2868 ret = do_convert(file, datacsum, packing, noxattr, copylabel, fslabel, progress);