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 CONV_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,
215 u64 last = hint_byte;
218 struct btrfs_block_group_cache *cache;
221 ret = find_first_extent_bit(&root->fs_info->free_space_cache,
222 last, &start, &end, EXTENT_DIRTY);
224 if (wrapped++ == 0) {
232 start = max(last, start);
234 if (last - start < num_bytes)
237 last = start + num_bytes;
238 if (test_range_bit(&root->fs_info->pinned_extents,
239 start, last - 1, EXTENT_DIRTY, 0))
242 cache = btrfs_lookup_block_group(root->fs_info, start);
244 if (cache->flags & BTRFS_BLOCK_GROUP_SYSTEM ||
245 last > cache->key.objectid + cache->key.offset) {
246 last = cache->key.objectid + cache->key.offset;
251 BUG_ON(num_bytes != root->nodesize);
252 if (check_crossing_stripes(start, num_bytes)) {
253 last = round_down(start + num_bytes,
258 clear_extent_dirty(&root->fs_info->free_space_cache,
259 start, start + num_bytes - 1, 0);
261 ins->objectid = start;
262 ins->offset = num_bytes;
263 ins->type = BTRFS_EXTENT_ITEM_KEY;
267 fprintf(stderr, "not enough free space\n");
271 static int intersect_with_sb(u64 bytenr, u64 num_bytes)
276 for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
277 offset = btrfs_sb_offset(i);
278 offset &= ~((u64)BTRFS_STRIPE_LEN - 1);
280 if (bytenr < offset + BTRFS_STRIPE_LEN &&
281 bytenr + num_bytes > offset)
287 static int custom_free_extent(struct btrfs_root *root, u64 bytenr,
290 return intersect_with_sb(bytenr, num_bytes);
293 static struct btrfs_extent_ops extent_ops = {
294 .alloc_extent = custom_alloc_extent,
295 .free_extent = custom_free_extent,
298 static int convert_insert_dirent(struct btrfs_trans_handle *trans,
299 struct btrfs_root *root,
300 const char *name, size_t name_len,
301 u64 dir, u64 objectid,
302 u8 file_type, u64 index_cnt,
303 struct btrfs_inode_item *inode)
307 struct btrfs_key location = {
308 .objectid = objectid,
310 .type = BTRFS_INODE_ITEM_KEY,
313 ret = btrfs_insert_dir_item(trans, root, name, name_len,
314 dir, &location, file_type, index_cnt);
317 ret = btrfs_insert_inode_ref(trans, root, name, name_len,
318 objectid, dir, index_cnt);
321 inode_size = btrfs_stack_inode_size(inode) + name_len * 2;
322 btrfs_set_stack_inode_size(inode, inode_size);
327 struct dir_iterate_data {
328 struct btrfs_trans_handle *trans;
329 struct btrfs_root *root;
330 struct btrfs_inode_item *inode;
337 static u8 filetype_conversion_table[EXT2_FT_MAX] = {
338 [EXT2_FT_UNKNOWN] = BTRFS_FT_UNKNOWN,
339 [EXT2_FT_REG_FILE] = BTRFS_FT_REG_FILE,
340 [EXT2_FT_DIR] = BTRFS_FT_DIR,
341 [EXT2_FT_CHRDEV] = BTRFS_FT_CHRDEV,
342 [EXT2_FT_BLKDEV] = BTRFS_FT_BLKDEV,
343 [EXT2_FT_FIFO] = BTRFS_FT_FIFO,
344 [EXT2_FT_SOCK] = BTRFS_FT_SOCK,
345 [EXT2_FT_SYMLINK] = BTRFS_FT_SYMLINK,
348 static int dir_iterate_proc(ext2_ino_t dir, int entry,
349 struct ext2_dir_entry *dirent,
350 int offset, int blocksize,
351 char *buf,void *priv_data)
356 char dotdot[] = "..";
357 struct dir_iterate_data *idata = (struct dir_iterate_data *)priv_data;
360 name_len = dirent->name_len & 0xFF;
362 objectid = dirent->inode + INO_OFFSET;
363 if (!strncmp(dirent->name, dotdot, name_len)) {
365 BUG_ON(idata->parent != 0);
366 idata->parent = objectid;
370 if (dirent->inode < EXT2_GOOD_OLD_FIRST_INO)
373 file_type = dirent->name_len >> 8;
374 BUG_ON(file_type > EXT2_FT_SYMLINK);
376 ret = convert_insert_dirent(idata->trans, idata->root, dirent->name,
377 name_len, idata->objectid, objectid,
378 filetype_conversion_table[file_type],
379 idata->index_cnt, idata->inode);
381 idata->errcode = ret;
389 static int create_dir_entries(struct btrfs_trans_handle *trans,
390 struct btrfs_root *root, u64 objectid,
391 struct btrfs_inode_item *btrfs_inode,
392 ext2_filsys ext2_fs, ext2_ino_t ext2_ino)
396 struct dir_iterate_data data = {
399 .inode = btrfs_inode,
400 .objectid = objectid,
406 err = ext2fs_dir_iterate2(ext2_fs, ext2_ino, 0, NULL,
407 dir_iterate_proc, &data);
411 if (ret == 0 && data.parent == objectid) {
412 ret = btrfs_insert_inode_ref(trans, root, "..", 2,
413 objectid, objectid, 0);
417 fprintf(stderr, "ext2fs_dir_iterate2: %s\n", error_message(err));
421 static int read_disk_extent(struct btrfs_root *root, u64 bytenr,
422 u32 num_bytes, char *buffer)
425 struct btrfs_fs_devices *fs_devs = root->fs_info->fs_devices;
427 ret = pread(fs_devs->latest_bdev, buffer, num_bytes, bytenr);
428 if (ret != num_bytes)
437 static int csum_disk_extent(struct btrfs_trans_handle *trans,
438 struct btrfs_root *root,
439 u64 disk_bytenr, u64 num_bytes)
441 u32 blocksize = root->sectorsize;
446 buffer = malloc(blocksize);
449 for (offset = 0; offset < num_bytes; offset += blocksize) {
450 ret = read_disk_extent(root, disk_bytenr + offset,
454 ret = btrfs_csum_file_block(trans,
455 root->fs_info->csum_root,
456 disk_bytenr + num_bytes,
457 disk_bytenr + offset,
466 struct blk_iterate_data {
467 struct btrfs_trans_handle *trans;
468 struct btrfs_root *root;
469 struct btrfs_inode_item *inode;
479 static void init_blk_iterate_data(struct blk_iterate_data *data,
480 struct btrfs_trans_handle *trans,
481 struct btrfs_root *root,
482 struct btrfs_inode_item *inode,
483 u64 objectid, int checksum)
488 data->objectid = objectid;
489 data->first_block = 0;
490 data->disk_block = 0;
491 data->num_blocks = 0;
492 data->boundary = (u64)-1;
493 data->checksum = checksum;
497 static int record_file_blocks(struct blk_iterate_data *data,
498 u64 file_block, u64 disk_block, u64 num_blocks)
501 struct btrfs_root *root = data->root;
502 u64 file_pos = file_block * root->sectorsize;
503 u64 disk_bytenr = disk_block * root->sectorsize;
504 u64 num_bytes = num_blocks * root->sectorsize;
505 ret = btrfs_record_file_extent(data->trans, data->root,
506 data->objectid, data->inode, file_pos,
507 disk_bytenr, num_bytes);
509 if (ret || !data->checksum || disk_bytenr == 0)
512 return csum_disk_extent(data->trans, data->root, disk_bytenr,
516 static int block_iterate_proc(u64 disk_block, u64 file_block,
517 struct blk_iterate_data *idata)
522 struct btrfs_root *root = idata->root;
523 struct btrfs_block_group_cache *cache;
524 u64 bytenr = disk_block * root->sectorsize;
526 sb_region = intersect_with_sb(bytenr, root->sectorsize);
527 do_barrier = sb_region || disk_block >= idata->boundary;
528 if ((idata->num_blocks > 0 && do_barrier) ||
529 (file_block > idata->first_block + idata->num_blocks) ||
530 (disk_block != idata->disk_block + idata->num_blocks)) {
531 if (idata->num_blocks > 0) {
532 ret = record_file_blocks(idata, idata->first_block,
537 idata->first_block += idata->num_blocks;
538 idata->num_blocks = 0;
540 if (file_block > idata->first_block) {
541 ret = record_file_blocks(idata, idata->first_block,
542 0, file_block - idata->first_block);
548 bytenr += BTRFS_STRIPE_LEN - 1;
549 bytenr &= ~((u64)BTRFS_STRIPE_LEN - 1);
551 cache = btrfs_lookup_block_group(root->fs_info, bytenr);
553 bytenr = cache->key.objectid + cache->key.offset;
556 idata->first_block = file_block;
557 idata->disk_block = disk_block;
558 idata->boundary = bytenr / root->sectorsize;
565 static int __block_iterate_proc(ext2_filsys fs, blk_t *blocknr,
566 e2_blkcnt_t blockcnt, blk_t ref_block,
567 int ref_offset, void *priv_data)
570 struct blk_iterate_data *idata;
571 idata = (struct blk_iterate_data *)priv_data;
572 ret = block_iterate_proc(*blocknr, blockcnt, idata);
574 idata->errcode = ret;
581 * traverse file's data blocks, record these data blocks as file extents.
583 static int create_file_extents(struct btrfs_trans_handle *trans,
584 struct btrfs_root *root, u64 objectid,
585 struct btrfs_inode_item *btrfs_inode,
586 ext2_filsys ext2_fs, ext2_ino_t ext2_ino,
587 int datacsum, int packing)
593 u32 sectorsize = root->sectorsize;
594 u64 inode_size = btrfs_stack_inode_size(btrfs_inode);
595 struct blk_iterate_data data;
597 init_blk_iterate_data(&data, trans, root, btrfs_inode, objectid,
600 err = ext2fs_block_iterate2(ext2_fs, ext2_ino, BLOCK_FLAG_DATA_ONLY,
601 NULL, __block_iterate_proc, &data);
607 if (packing && data.first_block == 0 && data.num_blocks > 0 &&
608 inode_size <= BTRFS_MAX_INLINE_DATA_SIZE(root)) {
609 u64 num_bytes = data.num_blocks * sectorsize;
610 u64 disk_bytenr = data.disk_block * sectorsize;
613 buffer = malloc(num_bytes);
616 ret = read_disk_extent(root, disk_bytenr, num_bytes, buffer);
619 if (num_bytes > inode_size)
620 num_bytes = inode_size;
621 ret = btrfs_insert_inline_extent(trans, root, objectid,
622 0, buffer, num_bytes);
625 nbytes = btrfs_stack_inode_nbytes(btrfs_inode) + num_bytes;
626 btrfs_set_stack_inode_nbytes(btrfs_inode, nbytes);
627 } else if (data.num_blocks > 0) {
628 ret = record_file_blocks(&data, data.first_block,
629 data.disk_block, data.num_blocks);
633 data.first_block += data.num_blocks;
634 last_block = (inode_size + sectorsize - 1) / sectorsize;
635 if (last_block > data.first_block) {
636 ret = record_file_blocks(&data, data.first_block, 0,
637 last_block - data.first_block);
643 fprintf(stderr, "ext2fs_block_iterate2: %s\n", error_message(err));
647 static int create_symbol_link(struct btrfs_trans_handle *trans,
648 struct btrfs_root *root, u64 objectid,
649 struct btrfs_inode_item *btrfs_inode,
650 ext2_filsys ext2_fs, ext2_ino_t ext2_ino,
651 struct ext2_inode *ext2_inode)
655 u64 inode_size = btrfs_stack_inode_size(btrfs_inode);
656 if (ext2fs_inode_data_blocks(ext2_fs, ext2_inode)) {
657 btrfs_set_stack_inode_size(btrfs_inode, inode_size + 1);
658 ret = create_file_extents(trans, root, objectid, btrfs_inode,
659 ext2_fs, ext2_ino, 1, 1);
660 btrfs_set_stack_inode_size(btrfs_inode, inode_size);
664 pathname = (char *)&(ext2_inode->i_block[0]);
665 BUG_ON(pathname[inode_size] != 0);
666 ret = btrfs_insert_inline_extent(trans, root, objectid, 0,
667 pathname, inode_size + 1);
668 btrfs_set_stack_inode_nbytes(btrfs_inode, inode_size + 1);
673 * Following xattr/acl related codes are based on codes in
674 * fs/ext3/xattr.c and fs/ext3/acl.c
676 #define EXT2_XATTR_BHDR(ptr) ((struct ext2_ext_attr_header *)(ptr))
677 #define EXT2_XATTR_BFIRST(ptr) \
678 ((struct ext2_ext_attr_entry *)(EXT2_XATTR_BHDR(ptr) + 1))
679 #define EXT2_XATTR_IHDR(inode) \
680 ((struct ext2_ext_attr_header *) ((void *)(inode) + \
681 EXT2_GOOD_OLD_INODE_SIZE + (inode)->i_extra_isize))
682 #define EXT2_XATTR_IFIRST(inode) \
683 ((struct ext2_ext_attr_entry *) ((void *)EXT2_XATTR_IHDR(inode) + \
684 sizeof(EXT2_XATTR_IHDR(inode)->h_magic)))
686 static int ext2_xattr_check_names(struct ext2_ext_attr_entry *entry,
689 struct ext2_ext_attr_entry *next;
691 while (!EXT2_EXT_IS_LAST_ENTRY(entry)) {
692 next = EXT2_EXT_ATTR_NEXT(entry);
693 if ((void *)next >= end)
700 static int ext2_xattr_check_block(const char *buf, size_t size)
703 struct ext2_ext_attr_header *header = EXT2_XATTR_BHDR(buf);
705 if (header->h_magic != EXT2_EXT_ATTR_MAGIC ||
706 header->h_blocks != 1)
708 error = ext2_xattr_check_names(EXT2_XATTR_BFIRST(buf), buf + size);
712 static int ext2_xattr_check_entry(struct ext2_ext_attr_entry *entry,
715 size_t value_size = entry->e_value_size;
717 if (entry->e_value_block != 0 || value_size > size ||
718 entry->e_value_offs + value_size > size)
723 #define EXT2_ACL_VERSION 0x0001
725 /* 23.2.5 acl_tag_t values */
727 #define ACL_UNDEFINED_TAG (0x00)
728 #define ACL_USER_OBJ (0x01)
729 #define ACL_USER (0x02)
730 #define ACL_GROUP_OBJ (0x04)
731 #define ACL_GROUP (0x08)
732 #define ACL_MASK (0x10)
733 #define ACL_OTHER (0x20)
735 /* 23.2.7 ACL qualifier constants */
737 #define ACL_UNDEFINED_ID ((id_t)-1)
748 } ext2_acl_entry_short;
754 static inline int ext2_acl_count(size_t size)
757 size -= sizeof(ext2_acl_header);
758 s = size - 4 * sizeof(ext2_acl_entry_short);
760 if (size % sizeof(ext2_acl_entry_short))
762 return size / sizeof(ext2_acl_entry_short);
764 if (s % sizeof(ext2_acl_entry))
766 return s / sizeof(ext2_acl_entry) + 4;
770 #define ACL_EA_VERSION 0x0002
780 acl_ea_entry a_entries[0];
783 static inline size_t acl_ea_size(int count)
785 return sizeof(acl_ea_header) + count * sizeof(acl_ea_entry);
788 static int ext2_acl_to_xattr(void *dst, const void *src,
789 size_t dst_size, size_t src_size)
792 const void *end = src + src_size;
793 acl_ea_header *ext_acl = (acl_ea_header *)dst;
794 acl_ea_entry *dst_entry = ext_acl->a_entries;
795 ext2_acl_entry *src_entry;
797 if (src_size < sizeof(ext2_acl_header))
799 if (((ext2_acl_header *)src)->a_version !=
800 cpu_to_le32(EXT2_ACL_VERSION))
802 src += sizeof(ext2_acl_header);
803 count = ext2_acl_count(src_size);
807 BUG_ON(dst_size < acl_ea_size(count));
808 ext_acl->a_version = cpu_to_le32(ACL_EA_VERSION);
809 for (i = 0; i < count; i++, dst_entry++) {
810 src_entry = (ext2_acl_entry *)src;
811 if (src + sizeof(ext2_acl_entry_short) > end)
813 dst_entry->e_tag = src_entry->e_tag;
814 dst_entry->e_perm = src_entry->e_perm;
815 switch (le16_to_cpu(src_entry->e_tag)) {
820 src += sizeof(ext2_acl_entry_short);
821 dst_entry->e_id = cpu_to_le32(ACL_UNDEFINED_ID);
825 src += sizeof(ext2_acl_entry);
828 dst_entry->e_id = src_entry->e_id;
841 static char *xattr_prefix_table[] = {
843 [2] = "system.posix_acl_access",
844 [3] = "system.posix_acl_default",
849 static int copy_single_xattr(struct btrfs_trans_handle *trans,
850 struct btrfs_root *root, u64 objectid,
851 struct ext2_ext_attr_entry *entry,
852 const void *data, u32 datalen)
857 void *databuf = NULL;
858 char namebuf[XATTR_NAME_MAX + 1];
860 name_index = entry->e_name_index;
861 if (name_index >= ARRAY_SIZE(xattr_prefix_table) ||
862 xattr_prefix_table[name_index] == NULL)
864 name_len = strlen(xattr_prefix_table[name_index]) +
866 if (name_len >= sizeof(namebuf))
869 if (name_index == 2 || name_index == 3) {
870 size_t bufsize = acl_ea_size(ext2_acl_count(datalen));
871 databuf = malloc(bufsize);
874 ret = ext2_acl_to_xattr(databuf, data, bufsize, datalen);
880 strncpy(namebuf, xattr_prefix_table[name_index], XATTR_NAME_MAX);
881 strncat(namebuf, EXT2_EXT_ATTR_NAME(entry), entry->e_name_len);
882 if (name_len + datalen > BTRFS_LEAF_DATA_SIZE(root) -
883 sizeof(struct btrfs_item) - sizeof(struct btrfs_dir_item)) {
884 fprintf(stderr, "skip large xattr on inode %Lu name %.*s\n",
885 objectid - INO_OFFSET, name_len, namebuf);
888 ret = btrfs_insert_xattr_item(trans, root, namebuf, name_len,
889 data, datalen, objectid);
895 static int copy_extended_attrs(struct btrfs_trans_handle *trans,
896 struct btrfs_root *root, u64 objectid,
897 struct btrfs_inode_item *btrfs_inode,
898 ext2_filsys ext2_fs, ext2_ino_t ext2_ino)
904 u32 block_size = ext2_fs->blocksize;
905 u32 inode_size = EXT2_INODE_SIZE(ext2_fs->super);
906 struct ext2_inode_large *ext2_inode;
907 struct ext2_ext_attr_entry *entry;
910 char inode_buf[EXT2_GOOD_OLD_INODE_SIZE];
912 if (inode_size <= EXT2_GOOD_OLD_INODE_SIZE) {
913 ext2_inode = (struct ext2_inode_large *)inode_buf;
915 ext2_inode = (struct ext2_inode_large *)malloc(inode_size);
919 err = ext2fs_read_inode_full(ext2_fs, ext2_ino, (void *)ext2_inode,
922 fprintf(stderr, "ext2fs_read_inode_full: %s\n",
928 if (ext2_ino > ext2_fs->super->s_first_ino &&
929 inode_size > EXT2_GOOD_OLD_INODE_SIZE) {
930 if (EXT2_GOOD_OLD_INODE_SIZE +
931 ext2_inode->i_extra_isize > inode_size) {
935 if (ext2_inode->i_extra_isize != 0 &&
936 EXT2_XATTR_IHDR(ext2_inode)->h_magic ==
937 EXT2_EXT_ATTR_MAGIC) {
943 void *end = (void *)ext2_inode + inode_size;
944 entry = EXT2_XATTR_IFIRST(ext2_inode);
945 total = end - (void *)entry;
946 ret = ext2_xattr_check_names(entry, end);
949 while (!EXT2_EXT_IS_LAST_ENTRY(entry)) {
950 ret = ext2_xattr_check_entry(entry, total);
953 data = (void *)EXT2_XATTR_IFIRST(ext2_inode) +
955 datalen = entry->e_value_size;
956 ret = copy_single_xattr(trans, root, objectid,
957 entry, data, datalen);
960 entry = EXT2_EXT_ATTR_NEXT(entry);
964 if (ext2_inode->i_file_acl == 0)
967 buffer = malloc(block_size);
972 err = ext2fs_read_ext_attr(ext2_fs, ext2_inode->i_file_acl, buffer);
974 fprintf(stderr, "ext2fs_read_ext_attr: %s\n",
979 ret = ext2_xattr_check_block(buffer, block_size);
983 entry = EXT2_XATTR_BFIRST(buffer);
984 while (!EXT2_EXT_IS_LAST_ENTRY(entry)) {
985 ret = ext2_xattr_check_entry(entry, block_size);
988 data = buffer + entry->e_value_offs;
989 datalen = entry->e_value_size;
990 ret = copy_single_xattr(trans, root, objectid,
991 entry, data, datalen);
994 entry = EXT2_EXT_ATTR_NEXT(entry);
998 if ((void *)ext2_inode != inode_buf)
1002 #define MINORBITS 20
1003 #define MKDEV(ma, mi) (((ma) << MINORBITS) | (mi))
1005 static inline dev_t old_decode_dev(u16 val)
1007 return MKDEV((val >> 8) & 255, val & 255);
1010 static inline dev_t new_decode_dev(u32 dev)
1012 unsigned major = (dev & 0xfff00) >> 8;
1013 unsigned minor = (dev & 0xff) | ((dev >> 12) & 0xfff00);
1014 return MKDEV(major, minor);
1017 static int copy_inode_item(struct btrfs_inode_item *dst,
1018 struct ext2_inode *src, u32 blocksize)
1020 btrfs_set_stack_inode_generation(dst, 1);
1021 btrfs_set_stack_inode_size(dst, src->i_size);
1022 btrfs_set_stack_inode_nbytes(dst, 0);
1023 btrfs_set_stack_inode_block_group(dst, 0);
1024 btrfs_set_stack_inode_nlink(dst, src->i_links_count);
1025 btrfs_set_stack_inode_uid(dst, src->i_uid | (src->i_uid_high << 16));
1026 btrfs_set_stack_inode_gid(dst, src->i_gid | (src->i_gid_high << 16));
1027 btrfs_set_stack_inode_mode(dst, src->i_mode);
1028 btrfs_set_stack_inode_rdev(dst, 0);
1029 btrfs_set_stack_inode_flags(dst, 0);
1030 btrfs_set_stack_timespec_sec(&dst->atime, src->i_atime);
1031 btrfs_set_stack_timespec_nsec(&dst->atime, 0);
1032 btrfs_set_stack_timespec_sec(&dst->ctime, src->i_ctime);
1033 btrfs_set_stack_timespec_nsec(&dst->ctime, 0);
1034 btrfs_set_stack_timespec_sec(&dst->mtime, src->i_mtime);
1035 btrfs_set_stack_timespec_nsec(&dst->mtime, 0);
1036 btrfs_set_stack_timespec_sec(&dst->otime, 0);
1037 btrfs_set_stack_timespec_nsec(&dst->otime, 0);
1039 if (S_ISDIR(src->i_mode)) {
1040 btrfs_set_stack_inode_size(dst, 0);
1041 btrfs_set_stack_inode_nlink(dst, 1);
1043 if (S_ISREG(src->i_mode)) {
1044 btrfs_set_stack_inode_size(dst, (u64)src->i_size_high << 32 |
1047 if (!S_ISREG(src->i_mode) && !S_ISDIR(src->i_mode) &&
1048 !S_ISLNK(src->i_mode)) {
1049 if (src->i_block[0]) {
1050 btrfs_set_stack_inode_rdev(dst,
1051 old_decode_dev(src->i_block[0]));
1053 btrfs_set_stack_inode_rdev(dst,
1054 new_decode_dev(src->i_block[1]));
1061 * copy a single inode. do all the required works, such as cloning
1062 * inode item, creating file extents and creating directory entries.
1064 static int copy_single_inode(struct btrfs_trans_handle *trans,
1065 struct btrfs_root *root, u64 objectid,
1066 ext2_filsys ext2_fs, ext2_ino_t ext2_ino,
1067 struct ext2_inode *ext2_inode,
1068 int datacsum, int packing, int noxattr)
1071 struct btrfs_inode_item btrfs_inode;
1073 if (ext2_inode->i_links_count == 0)
1076 copy_inode_item(&btrfs_inode, ext2_inode, ext2_fs->blocksize);
1077 if (!datacsum && S_ISREG(ext2_inode->i_mode)) {
1078 u32 flags = btrfs_stack_inode_flags(&btrfs_inode) |
1079 BTRFS_INODE_NODATASUM;
1080 btrfs_set_stack_inode_flags(&btrfs_inode, flags);
1083 switch (ext2_inode->i_mode & S_IFMT) {
1085 ret = create_file_extents(trans, root, objectid, &btrfs_inode,
1086 ext2_fs, ext2_ino, datacsum, packing);
1089 ret = create_dir_entries(trans, root, objectid, &btrfs_inode,
1093 ret = create_symbol_link(trans, root, objectid, &btrfs_inode,
1094 ext2_fs, ext2_ino, ext2_inode);
1104 ret = copy_extended_attrs(trans, root, objectid, &btrfs_inode,
1109 return btrfs_insert_inode(trans, root, objectid, &btrfs_inode);
1112 static int copy_disk_extent(struct btrfs_root *root, u64 dst_bytenr,
1113 u64 src_bytenr, u32 num_bytes)
1117 struct btrfs_fs_devices *fs_devs = root->fs_info->fs_devices;
1119 buffer = malloc(num_bytes);
1122 ret = pread(fs_devs->latest_bdev, buffer, num_bytes, src_bytenr);
1123 if (ret != num_bytes)
1125 ret = pwrite(fs_devs->latest_bdev, buffer, num_bytes, dst_bytenr);
1126 if (ret != num_bytes)
1136 * scan ext2's inode bitmap and copy all used inodes.
1138 static int copy_inodes(struct btrfs_root *root, ext2_filsys ext2_fs,
1139 int datacsum, int packing, int noxattr, struct task_ctx *p)
1143 ext2_inode_scan ext2_scan;
1144 struct ext2_inode ext2_inode;
1145 ext2_ino_t ext2_ino;
1147 struct btrfs_trans_handle *trans;
1149 trans = btrfs_start_transaction(root, 1);
1152 err = ext2fs_open_inode_scan(ext2_fs, 0, &ext2_scan);
1154 fprintf(stderr, "ext2fs_open_inode_scan: %s\n", error_message(err));
1157 while (!(err = ext2fs_get_next_inode(ext2_scan, &ext2_ino,
1159 /* no more inodes */
1162 /* skip special inode in ext2fs */
1163 if (ext2_ino < EXT2_GOOD_OLD_FIRST_INO &&
1164 ext2_ino != EXT2_ROOT_INO)
1166 objectid = ext2_ino + INO_OFFSET;
1167 ret = copy_single_inode(trans, root,
1168 objectid, ext2_fs, ext2_ino,
1169 &ext2_inode, datacsum, packing,
1171 p->cur_copy_inodes++;
1174 if (trans->blocks_used >= 4096) {
1175 ret = btrfs_commit_transaction(trans, root);
1177 trans = btrfs_start_transaction(root, 1);
1182 fprintf(stderr, "ext2fs_get_next_inode: %s\n", error_message(err));
1185 ret = btrfs_commit_transaction(trans, root);
1192 * Construct a range of ext2fs image file.
1193 * scan block allocation bitmap, find all blocks used by the ext2fs
1194 * in this range and create file extents that point to these blocks.
1196 * Note: Before calling the function, no file extent points to blocks
1199 static int create_image_file_range(struct btrfs_trans_handle *trans,
1200 struct btrfs_root *root, u64 objectid,
1201 struct btrfs_inode_item *inode,
1202 u64 start_byte, u64 end_byte,
1203 ext2_filsys ext2_fs, int datacsum)
1205 u32 blocksize = ext2_fs->blocksize;
1206 u32 block = start_byte / blocksize;
1207 u32 last_block = (end_byte + blocksize - 1) / blocksize;
1209 struct blk_iterate_data data;
1211 init_blk_iterate_data(&data, trans, root, inode, objectid, datacsum);
1212 data.first_block = block;
1214 for (; start_byte < end_byte; block++, start_byte += blocksize) {
1215 if (!ext2fs_fast_test_block_bitmap(ext2_fs->block_map, block))
1217 ret = block_iterate_proc(block, block, &data);
1221 if (data.num_blocks > 0) {
1222 ret = record_file_blocks(&data, data.first_block,
1223 data.disk_block, data.num_blocks);
1226 data.first_block += data.num_blocks;
1228 if (last_block > data.first_block) {
1229 ret = record_file_blocks(&data, data.first_block, 0,
1230 last_block - data.first_block);
1238 * Create the ext2fs image file.
1240 static int create_ext2_image(struct btrfs_root *root, ext2_filsys ext2_fs,
1241 const char *name, int datacsum)
1244 struct btrfs_key key;
1245 struct btrfs_key location;
1246 struct btrfs_path path;
1247 struct btrfs_inode_item btrfs_inode;
1248 struct btrfs_inode_item *inode_item;
1249 struct extent_buffer *leaf;
1250 struct btrfs_fs_info *fs_info = root->fs_info;
1251 struct btrfs_root *extent_root = fs_info->extent_root;
1252 struct btrfs_trans_handle *trans;
1253 struct btrfs_extent_item *ei;
1254 struct btrfs_extent_inline_ref *iref;
1255 struct btrfs_extent_data_ref *dref;
1262 u64 flags = BTRFS_INODE_READONLY;
1263 u32 sectorsize = root->sectorsize;
1265 total_bytes = btrfs_super_total_bytes(fs_info->super_copy);
1266 first_free = BTRFS_SUPER_INFO_OFFSET + sectorsize * 2 - 1;
1267 first_free &= ~((u64)sectorsize - 1);
1269 flags |= BTRFS_INODE_NODATASUM;
1271 memset(&btrfs_inode, 0, sizeof(btrfs_inode));
1272 btrfs_set_stack_inode_generation(&btrfs_inode, 1);
1273 btrfs_set_stack_inode_size(&btrfs_inode, total_bytes);
1274 btrfs_set_stack_inode_nlink(&btrfs_inode, 1);
1275 btrfs_set_stack_inode_nbytes(&btrfs_inode, 0);
1276 btrfs_set_stack_inode_mode(&btrfs_inode, S_IFREG | 0400);
1277 btrfs_set_stack_inode_flags(&btrfs_inode, flags);
1278 btrfs_init_path(&path);
1279 trans = btrfs_start_transaction(root, 1);
1282 objectid = btrfs_root_dirid(&root->root_item);
1283 ret = btrfs_find_free_objectid(trans, root, objectid, &objectid);
1288 * copy blocks covered by extent #0 to new positions. extent #0 is
1289 * special, we can't rely on relocate_extents_range to relocate it.
1291 for (last_byte = 0; last_byte < first_free; last_byte += sectorsize) {
1292 ret = custom_alloc_extent(root, sectorsize, 0, &key, 0);
1295 ret = copy_disk_extent(root, key.objectid, last_byte,
1299 ret = btrfs_record_file_extent(trans, root, objectid,
1300 &btrfs_inode, last_byte,
1301 key.objectid, sectorsize);
1305 ret = csum_disk_extent(trans, root, key.objectid,
1313 key.objectid = last_byte;
1315 btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY);
1316 ret = btrfs_search_slot(trans, fs_info->extent_root,
1321 leaf = path.nodes[0];
1322 if (path.slots[0] >= btrfs_header_nritems(leaf)) {
1323 ret = btrfs_next_leaf(extent_root, &path);
1328 leaf = path.nodes[0];
1330 btrfs_item_key_to_cpu(leaf, &key, path.slots[0]);
1331 if (last_byte > key.objectid ||
1332 key.type != BTRFS_EXTENT_ITEM_KEY) {
1337 bytenr = key.objectid;
1338 num_bytes = key.offset;
1339 ei = btrfs_item_ptr(leaf, path.slots[0],
1340 struct btrfs_extent_item);
1341 if (!(btrfs_extent_flags(leaf, ei) & BTRFS_EXTENT_FLAG_DATA)) {
1346 BUG_ON(btrfs_item_size_nr(leaf, path.slots[0]) != sizeof(*ei) +
1347 btrfs_extent_inline_ref_size(BTRFS_EXTENT_DATA_REF_KEY));
1349 iref = (struct btrfs_extent_inline_ref *)(ei + 1);
1350 key.type = btrfs_extent_inline_ref_type(leaf, iref);
1351 BUG_ON(key.type != BTRFS_EXTENT_DATA_REF_KEY);
1352 dref = (struct btrfs_extent_data_ref *)(&iref->offset);
1353 if (btrfs_extent_data_ref_root(leaf, dref) !=
1354 BTRFS_FS_TREE_OBJECTID) {
1359 if (bytenr > last_byte) {
1360 ret = create_image_file_range(trans, root, objectid,
1361 &btrfs_inode, last_byte,
1367 ret = btrfs_record_file_extent(trans, root, objectid,
1368 &btrfs_inode, bytenr, bytenr,
1372 last_byte = bytenr + num_bytes;
1373 btrfs_release_path(&path);
1375 if (trans->blocks_used >= 4096) {
1376 ret = btrfs_commit_transaction(trans, root);
1378 trans = btrfs_start_transaction(root, 1);
1382 btrfs_release_path(&path);
1383 if (total_bytes > last_byte) {
1384 ret = create_image_file_range(trans, root, objectid,
1385 &btrfs_inode, last_byte,
1386 total_bytes, ext2_fs,
1392 ret = btrfs_insert_inode(trans, root, objectid, &btrfs_inode);
1396 location.objectid = objectid;
1397 location.offset = 0;
1398 btrfs_set_key_type(&location, BTRFS_INODE_ITEM_KEY);
1399 ret = btrfs_insert_dir_item(trans, root, name, strlen(name),
1400 btrfs_root_dirid(&root->root_item),
1401 &location, BTRFS_FT_REG_FILE, objectid);
1404 ret = btrfs_insert_inode_ref(trans, root, name, strlen(name),
1406 btrfs_root_dirid(&root->root_item),
1410 location.objectid = btrfs_root_dirid(&root->root_item);
1411 location.offset = 0;
1412 btrfs_set_key_type(&location, BTRFS_INODE_ITEM_KEY);
1413 ret = btrfs_lookup_inode(trans, root, &path, &location, 1);
1416 leaf = path.nodes[0];
1417 inode_item = btrfs_item_ptr(leaf, path.slots[0],
1418 struct btrfs_inode_item);
1419 btrfs_set_inode_size(leaf, inode_item, strlen(name) * 2 +
1420 btrfs_inode_size(leaf, inode_item));
1421 btrfs_mark_buffer_dirty(leaf);
1422 btrfs_release_path(&path);
1423 ret = btrfs_commit_transaction(trans, root);
1426 btrfs_release_path(&path);
1430 static struct btrfs_root * link_subvol(struct btrfs_root *root,
1431 const char *base, u64 root_objectid)
1433 struct btrfs_trans_handle *trans;
1434 struct btrfs_fs_info *fs_info = root->fs_info;
1435 struct btrfs_root *tree_root = fs_info->tree_root;
1436 struct btrfs_root *new_root = NULL;
1437 struct btrfs_path *path;
1438 struct btrfs_inode_item *inode_item;
1439 struct extent_buffer *leaf;
1440 struct btrfs_key key;
1441 u64 dirid = btrfs_root_dirid(&root->root_item);
1443 char buf[BTRFS_NAME_LEN + 1]; /* for snprintf null */
1449 if (len < 1 || len > BTRFS_NAME_LEN)
1452 path = btrfs_alloc_path();
1455 key.objectid = dirid;
1456 key.type = BTRFS_DIR_INDEX_KEY;
1457 key.offset = (u64)-1;
1459 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1462 if (path->slots[0] > 0) {
1464 btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
1465 if (key.objectid == dirid && key.type == BTRFS_DIR_INDEX_KEY)
1466 index = key.offset + 1;
1468 btrfs_release_path(path);
1470 trans = btrfs_start_transaction(root, 1);
1473 key.objectid = dirid;
1475 key.type = BTRFS_INODE_ITEM_KEY;
1477 ret = btrfs_lookup_inode(trans, root, path, &key, 1);
1479 leaf = path->nodes[0];
1480 inode_item = btrfs_item_ptr(leaf, path->slots[0],
1481 struct btrfs_inode_item);
1483 key.objectid = root_objectid;
1484 key.offset = (u64)-1;
1485 key.type = BTRFS_ROOT_ITEM_KEY;
1487 memcpy(buf, base, len);
1488 for (i = 0; i < 1024; i++) {
1489 ret = btrfs_insert_dir_item(trans, root, buf, len,
1490 dirid, &key, BTRFS_FT_DIR, index);
1493 len = snprintf(buf, ARRAY_SIZE(buf), "%s%d", base, i);
1494 if (len < 1 || len > BTRFS_NAME_LEN) {
1502 btrfs_set_inode_size(leaf, inode_item, len * 2 +
1503 btrfs_inode_size(leaf, inode_item));
1504 btrfs_mark_buffer_dirty(leaf);
1505 btrfs_release_path(path);
1507 /* add the backref first */
1508 ret = btrfs_add_root_ref(trans, tree_root, root_objectid,
1509 BTRFS_ROOT_BACKREF_KEY,
1510 root->root_key.objectid,
1511 dirid, index, buf, len);
1514 /* now add the forward ref */
1515 ret = btrfs_add_root_ref(trans, tree_root, root->root_key.objectid,
1516 BTRFS_ROOT_REF_KEY, root_objectid,
1517 dirid, index, buf, len);
1519 ret = btrfs_commit_transaction(trans, root);
1522 new_root = btrfs_read_fs_root(fs_info, &key);
1523 if (IS_ERR(new_root))
1526 btrfs_free_path(path);
1530 static int create_chunk_mapping(struct btrfs_trans_handle *trans,
1531 struct btrfs_root *root)
1533 struct btrfs_fs_info *info = root->fs_info;
1534 struct btrfs_root *chunk_root = info->chunk_root;
1535 struct btrfs_root *extent_root = info->extent_root;
1536 struct btrfs_device *device;
1537 struct btrfs_block_group_cache *cache;
1538 struct btrfs_dev_extent *extent;
1539 struct extent_buffer *leaf;
1540 struct btrfs_chunk chunk;
1541 struct btrfs_key key;
1542 struct btrfs_path path;
1548 btrfs_init_path(&path);
1550 total_bytes = btrfs_super_total_bytes(root->fs_info->super_copy);
1551 chunk_objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID;
1553 BUG_ON(list_empty(&info->fs_devices->devices));
1554 device = list_entry(info->fs_devices->devices.next,
1555 struct btrfs_device, dev_list);
1556 BUG_ON(device->devid != info->fs_devices->latest_devid);
1558 /* delete device extent created by make_btrfs */
1559 key.objectid = device->devid;
1561 key.type = BTRFS_DEV_EXTENT_KEY;
1562 ret = btrfs_search_slot(trans, device->dev_root, &key, &path, -1, 1);
1567 ret = btrfs_del_item(trans, device->dev_root, &path);
1570 btrfs_release_path(&path);
1572 /* delete chunk item created by make_btrfs */
1573 key.objectid = chunk_objectid;
1575 key.type = BTRFS_CHUNK_ITEM_KEY;
1576 ret = btrfs_search_slot(trans, chunk_root, &key, &path, -1, 1);
1581 ret = btrfs_del_item(trans, chunk_root, &path);
1584 btrfs_release_path(&path);
1586 /* for each block group, create device extent and chunk item */
1588 while (cur_start < total_bytes) {
1589 cache = btrfs_lookup_block_group(root->fs_info, cur_start);
1592 /* insert device extent */
1593 key.objectid = device->devid;
1594 key.offset = cache->key.objectid;
1595 key.type = BTRFS_DEV_EXTENT_KEY;
1596 ret = btrfs_insert_empty_item(trans, device->dev_root, &path,
1597 &key, sizeof(*extent));
1601 leaf = path.nodes[0];
1602 extent = btrfs_item_ptr(leaf, path.slots[0],
1603 struct btrfs_dev_extent);
1605 btrfs_set_dev_extent_chunk_tree(leaf, extent,
1606 chunk_root->root_key.objectid);
1607 btrfs_set_dev_extent_chunk_objectid(leaf, extent,
1609 btrfs_set_dev_extent_chunk_offset(leaf, extent,
1610 cache->key.objectid);
1611 btrfs_set_dev_extent_length(leaf, extent, cache->key.offset);
1612 write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid,
1613 (unsigned long)btrfs_dev_extent_chunk_tree_uuid(extent),
1615 btrfs_mark_buffer_dirty(leaf);
1616 btrfs_release_path(&path);
1618 /* insert chunk item */
1619 btrfs_set_stack_chunk_length(&chunk, cache->key.offset);
1620 btrfs_set_stack_chunk_owner(&chunk,
1621 extent_root->root_key.objectid);
1622 btrfs_set_stack_chunk_stripe_len(&chunk, BTRFS_STRIPE_LEN);
1623 btrfs_set_stack_chunk_type(&chunk, cache->flags);
1624 btrfs_set_stack_chunk_io_align(&chunk, device->io_align);
1625 btrfs_set_stack_chunk_io_width(&chunk, device->io_width);
1626 btrfs_set_stack_chunk_sector_size(&chunk, device->sector_size);
1627 btrfs_set_stack_chunk_num_stripes(&chunk, 1);
1628 btrfs_set_stack_chunk_sub_stripes(&chunk, 0);
1629 btrfs_set_stack_stripe_devid(&chunk.stripe, device->devid);
1630 btrfs_set_stack_stripe_offset(&chunk.stripe,
1631 cache->key.objectid);
1632 memcpy(&chunk.stripe.dev_uuid, device->uuid, BTRFS_UUID_SIZE);
1634 key.objectid = chunk_objectid;
1635 key.offset = cache->key.objectid;
1636 key.type = BTRFS_CHUNK_ITEM_KEY;
1638 ret = btrfs_insert_item(trans, chunk_root, &key, &chunk,
1639 btrfs_chunk_item_size(1));
1643 cur_start = cache->key.objectid + cache->key.offset;
1646 device->bytes_used = total_bytes;
1647 ret = btrfs_update_device(trans, device);
1649 btrfs_release_path(&path);
1653 static int create_subvol(struct btrfs_trans_handle *trans,
1654 struct btrfs_root *root, u64 root_objectid)
1656 struct extent_buffer *tmp;
1657 struct btrfs_root *new_root;
1658 struct btrfs_key key;
1659 struct btrfs_root_item root_item;
1662 ret = btrfs_copy_root(trans, root, root->node, &tmp,
1666 memcpy(&root_item, &root->root_item, sizeof(root_item));
1667 btrfs_set_root_bytenr(&root_item, tmp->start);
1668 btrfs_set_root_level(&root_item, btrfs_header_level(tmp));
1669 btrfs_set_root_generation(&root_item, trans->transid);
1670 free_extent_buffer(tmp);
1672 key.objectid = root_objectid;
1673 key.type = BTRFS_ROOT_ITEM_KEY;
1674 key.offset = trans->transid;
1675 ret = btrfs_insert_root(trans, root->fs_info->tree_root,
1678 key.offset = (u64)-1;
1679 new_root = btrfs_read_fs_root(root->fs_info, &key);
1680 BUG_ON(!new_root || IS_ERR(new_root));
1682 ret = btrfs_make_root_dir(trans, new_root, BTRFS_FIRST_FREE_OBJECTID);
1688 static int init_btrfs(struct btrfs_root *root)
1691 struct btrfs_key location;
1692 struct btrfs_trans_handle *trans;
1693 struct btrfs_fs_info *fs_info = root->fs_info;
1694 struct extent_buffer *tmp;
1696 trans = btrfs_start_transaction(root, 1);
1698 ret = btrfs_make_block_groups(trans, root);
1701 ret = btrfs_fix_block_accounting(trans, root);
1704 ret = create_chunk_mapping(trans, root);
1707 ret = btrfs_make_root_dir(trans, fs_info->tree_root,
1708 BTRFS_ROOT_TREE_DIR_OBJECTID);
1711 memcpy(&location, &root->root_key, sizeof(location));
1712 location.offset = (u64)-1;
1713 ret = btrfs_insert_dir_item(trans, fs_info->tree_root, "default", 7,
1714 btrfs_super_root_dir(fs_info->super_copy),
1715 &location, BTRFS_FT_DIR, 0);
1718 ret = btrfs_insert_inode_ref(trans, fs_info->tree_root, "default", 7,
1720 btrfs_super_root_dir(fs_info->super_copy), 0);
1723 btrfs_set_root_dirid(&fs_info->fs_root->root_item,
1724 BTRFS_FIRST_FREE_OBJECTID);
1726 /* subvol for ext2 image file */
1727 ret = create_subvol(trans, root, CONV_IMAGE_SUBVOL_OBJECTID);
1729 /* subvol for data relocation */
1730 ret = create_subvol(trans, root, BTRFS_DATA_RELOC_TREE_OBJECTID);
1733 extent_buffer_get(fs_info->csum_root->node);
1734 ret = __btrfs_cow_block(trans, fs_info->csum_root,
1735 fs_info->csum_root->node, NULL, 0, &tmp, 0, 0);
1737 free_extent_buffer(tmp);
1739 ret = btrfs_commit_transaction(trans, root);
1746 * Migrate super block to its default position and zero 0 ~ 16k
1748 static int migrate_super_block(int fd, u64 old_bytenr, u32 sectorsize)
1751 struct extent_buffer *buf;
1752 struct btrfs_super_block *super;
1756 BUG_ON(sectorsize < sizeof(*super));
1757 buf = malloc(sizeof(*buf) + sectorsize);
1761 buf->len = sectorsize;
1762 ret = pread(fd, buf->data, sectorsize, old_bytenr);
1763 if (ret != sectorsize)
1766 super = (struct btrfs_super_block *)buf->data;
1767 BUG_ON(btrfs_super_bytenr(super) != old_bytenr);
1768 btrfs_set_super_bytenr(super, BTRFS_SUPER_INFO_OFFSET);
1770 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
1771 ret = pwrite(fd, buf->data, sectorsize, BTRFS_SUPER_INFO_OFFSET);
1772 if (ret != sectorsize)
1779 memset(buf->data, 0, sectorsize);
1780 for (bytenr = 0; bytenr < BTRFS_SUPER_INFO_OFFSET; ) {
1781 len = BTRFS_SUPER_INFO_OFFSET - bytenr;
1782 if (len > sectorsize)
1784 ret = pwrite(fd, buf->data, len, bytenr);
1786 fprintf(stderr, "unable to zero fill device\n");
1800 static int prepare_system_chunk_sb(struct btrfs_super_block *super)
1802 struct btrfs_chunk *chunk;
1803 struct btrfs_disk_key *key;
1804 u32 sectorsize = btrfs_super_sectorsize(super);
1806 key = (struct btrfs_disk_key *)(super->sys_chunk_array);
1807 chunk = (struct btrfs_chunk *)(super->sys_chunk_array +
1808 sizeof(struct btrfs_disk_key));
1810 btrfs_set_disk_key_objectid(key, BTRFS_FIRST_CHUNK_TREE_OBJECTID);
1811 btrfs_set_disk_key_type(key, BTRFS_CHUNK_ITEM_KEY);
1812 btrfs_set_disk_key_offset(key, 0);
1814 btrfs_set_stack_chunk_length(chunk, btrfs_super_total_bytes(super));
1815 btrfs_set_stack_chunk_owner(chunk, BTRFS_EXTENT_TREE_OBJECTID);
1816 btrfs_set_stack_chunk_stripe_len(chunk, BTRFS_STRIPE_LEN);
1817 btrfs_set_stack_chunk_type(chunk, BTRFS_BLOCK_GROUP_SYSTEM);
1818 btrfs_set_stack_chunk_io_align(chunk, sectorsize);
1819 btrfs_set_stack_chunk_io_width(chunk, sectorsize);
1820 btrfs_set_stack_chunk_sector_size(chunk, sectorsize);
1821 btrfs_set_stack_chunk_num_stripes(chunk, 1);
1822 btrfs_set_stack_chunk_sub_stripes(chunk, 0);
1823 chunk->stripe.devid = super->dev_item.devid;
1824 btrfs_set_stack_stripe_offset(&chunk->stripe, 0);
1825 memcpy(chunk->stripe.dev_uuid, super->dev_item.uuid, BTRFS_UUID_SIZE);
1826 btrfs_set_super_sys_array_size(super, sizeof(*key) + sizeof(*chunk));
1830 static int prepare_system_chunk(int fd, u64 sb_bytenr)
1833 struct extent_buffer *buf;
1834 struct btrfs_super_block *super;
1836 BUG_ON(BTRFS_SUPER_INFO_SIZE < sizeof(*super));
1837 buf = malloc(sizeof(*buf) + BTRFS_SUPER_INFO_SIZE);
1841 buf->len = BTRFS_SUPER_INFO_SIZE;
1842 ret = pread(fd, buf->data, BTRFS_SUPER_INFO_SIZE, sb_bytenr);
1843 if (ret != BTRFS_SUPER_INFO_SIZE)
1846 super = (struct btrfs_super_block *)buf->data;
1847 BUG_ON(btrfs_super_bytenr(super) != sb_bytenr);
1848 BUG_ON(btrfs_super_num_devices(super) != 1);
1850 ret = prepare_system_chunk_sb(super);
1854 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
1855 ret = pwrite(fd, buf->data, BTRFS_SUPER_INFO_SIZE, sb_bytenr);
1856 if (ret != BTRFS_SUPER_INFO_SIZE)
1867 static int relocate_one_reference(struct btrfs_trans_handle *trans,
1868 struct btrfs_root *root,
1869 u64 extent_start, u64 extent_size,
1870 struct btrfs_key *extent_key,
1871 struct extent_io_tree *reloc_tree)
1873 struct extent_buffer *leaf;
1874 struct btrfs_file_extent_item *fi;
1875 struct btrfs_key key;
1876 struct btrfs_path path;
1877 struct btrfs_inode_item inode;
1878 struct blk_iterate_data data;
1885 u32 sectorsize = root->sectorsize;
1891 btrfs_init_path(&path);
1892 ret = btrfs_search_slot(trans, root, extent_key, &path, -1, 1);
1896 leaf = path.nodes[0];
1897 fi = btrfs_item_ptr(leaf, path.slots[0],
1898 struct btrfs_file_extent_item);
1899 BUG_ON(btrfs_file_extent_offset(leaf, fi) > 0);
1900 if (extent_start != btrfs_file_extent_disk_bytenr(leaf, fi) ||
1901 extent_size != btrfs_file_extent_disk_num_bytes(leaf, fi)) {
1906 bytenr = extent_start + btrfs_file_extent_offset(leaf, fi);
1907 num_bytes = btrfs_file_extent_num_bytes(leaf, fi);
1909 ret = btrfs_del_item(trans, root, &path);
1913 ret = btrfs_free_extent(trans, root, extent_start, extent_size, 0,
1914 root->root_key.objectid,
1915 extent_key->objectid, extent_key->offset);
1919 btrfs_release_path(&path);
1921 key.objectid = extent_key->objectid;
1923 key.type = BTRFS_INODE_ITEM_KEY;
1924 ret = btrfs_lookup_inode(trans, root, &path, &key, 0);
1928 leaf = path.nodes[0];
1929 ptr = btrfs_item_ptr_offset(leaf, path.slots[0]);
1930 read_extent_buffer(leaf, &inode, ptr, sizeof(inode));
1931 btrfs_release_path(&path);
1933 BUG_ON(num_bytes & (sectorsize - 1));
1934 nbytes = btrfs_stack_inode_nbytes(&inode) - num_bytes;
1935 btrfs_set_stack_inode_nbytes(&inode, nbytes);
1936 datacsum = !(btrfs_stack_inode_flags(&inode) & BTRFS_INODE_NODATASUM);
1938 init_blk_iterate_data(&data, trans, root, &inode, extent_key->objectid,
1940 data.first_block = extent_key->offset;
1942 cur_offset = extent_key->offset;
1943 while (num_bytes > 0) {
1944 sector_end = bytenr + sectorsize - 1;
1945 if (test_range_bit(reloc_tree, bytenr, sector_end,
1946 EXTENT_LOCKED, 1)) {
1947 ret = get_state_private(reloc_tree, bytenr, &new_pos);
1950 ret = custom_alloc_extent(root, sectorsize, 0, &key, 0);
1953 new_pos = key.objectid;
1955 if (cur_offset == extent_key->offset) {
1956 fd = root->fs_info->fs_devices->latest_bdev;
1957 readahead(fd, bytenr, num_bytes);
1959 ret = copy_disk_extent(root, new_pos, bytenr,
1963 ret = set_extent_bits(reloc_tree, bytenr, sector_end,
1964 EXTENT_LOCKED, GFP_NOFS);
1966 ret = set_state_private(reloc_tree, bytenr, new_pos);
1970 ret = block_iterate_proc(new_pos / sectorsize,
1971 cur_offset / sectorsize, &data);
1975 cur_offset += sectorsize;
1976 bytenr += sectorsize;
1977 num_bytes -= sectorsize;
1980 if (data.num_blocks > 0) {
1981 ret = record_file_blocks(&data, data.first_block,
1982 data.disk_block, data.num_blocks);
1987 key.objectid = extent_key->objectid;
1989 key.type = BTRFS_INODE_ITEM_KEY;
1990 ret = btrfs_lookup_inode(trans, root, &path, &key, 1);
1994 leaf = path.nodes[0];
1995 ptr = btrfs_item_ptr_offset(leaf, path.slots[0]);
1996 write_extent_buffer(leaf, &inode, ptr, sizeof(inode));
1997 btrfs_mark_buffer_dirty(leaf);
1998 btrfs_release_path(&path);
2001 btrfs_release_path(&path);
2005 static int relocate_extents_range(struct btrfs_root *fs_root,
2006 struct btrfs_root *image_root,
2007 u64 start_byte, u64 end_byte)
2009 struct btrfs_fs_info *info = fs_root->fs_info;
2010 struct btrfs_root *extent_root = info->extent_root;
2011 struct btrfs_root *cur_root = NULL;
2012 struct btrfs_trans_handle *trans;
2013 struct btrfs_extent_data_ref *dref;
2014 struct btrfs_extent_inline_ref *iref;
2015 struct btrfs_extent_item *ei;
2016 struct extent_buffer *leaf;
2017 struct btrfs_key key;
2018 struct btrfs_key extent_key;
2019 struct btrfs_path path;
2020 struct extent_io_tree reloc_tree;
2030 btrfs_init_path(&path);
2031 extent_io_tree_init(&reloc_tree);
2033 key.objectid = start_byte;
2035 key.type = BTRFS_EXTENT_ITEM_KEY;
2036 ret = btrfs_search_slot(NULL, extent_root, &key, &path, 0, 0);
2040 ret = btrfs_previous_item(extent_root, &path, 0,
2041 BTRFS_EXTENT_ITEM_KEY);
2045 leaf = path.nodes[0];
2046 btrfs_item_key_to_cpu(leaf, &key, path.slots[0]);
2047 if (key.objectid + key.offset > start_byte)
2048 start_byte = key.objectid;
2051 btrfs_release_path(&path);
2053 cur_root = (pass % 2 == 0) ? image_root : fs_root;
2056 trans = btrfs_start_transaction(cur_root, 1);
2059 cur_byte = start_byte;
2061 key.objectid = cur_byte;
2063 key.type = BTRFS_EXTENT_ITEM_KEY;
2064 ret = btrfs_search_slot(trans, extent_root,
2069 leaf = path.nodes[0];
2070 if (path.slots[0] >= btrfs_header_nritems(leaf)) {
2071 ret = btrfs_next_leaf(extent_root, &path);
2076 leaf = path.nodes[0];
2079 btrfs_item_key_to_cpu(leaf, &key, path.slots[0]);
2080 if (key.objectid < cur_byte ||
2081 key.type != BTRFS_EXTENT_ITEM_KEY) {
2085 if (key.objectid >= end_byte)
2090 cur_byte = key.objectid;
2091 num_bytes = key.offset;
2092 ei = btrfs_item_ptr(leaf, path.slots[0],
2093 struct btrfs_extent_item);
2094 BUG_ON(!(btrfs_extent_flags(leaf, ei) &
2095 BTRFS_EXTENT_FLAG_DATA));
2097 ptr = btrfs_item_ptr_offset(leaf, path.slots[0]);
2098 end = ptr + btrfs_item_size_nr(leaf, path.slots[0]);
2100 ptr += sizeof(struct btrfs_extent_item);
2103 iref = (struct btrfs_extent_inline_ref *)ptr;
2104 key.type = btrfs_extent_inline_ref_type(leaf, iref);
2105 BUG_ON(key.type != BTRFS_EXTENT_DATA_REF_KEY);
2106 dref = (struct btrfs_extent_data_ref *)(&iref->offset);
2107 ref_root = btrfs_extent_data_ref_root(leaf, dref);
2108 extent_key.objectid =
2109 btrfs_extent_data_ref_objectid(leaf, dref);
2111 btrfs_extent_data_ref_offset(leaf, dref);
2112 extent_key.type = BTRFS_EXTENT_DATA_KEY;
2113 BUG_ON(btrfs_extent_data_ref_count(leaf, dref) != 1);
2115 if (ref_root == cur_root->root_key.objectid)
2118 ptr += btrfs_extent_inline_ref_size(key.type);
2126 ret = relocate_one_reference(trans, cur_root, cur_byte,
2127 num_bytes, &extent_key,
2132 cur_byte += num_bytes;
2133 btrfs_release_path(&path);
2135 if (trans->blocks_used >= 4096) {
2136 ret = btrfs_commit_transaction(trans, cur_root);
2138 trans = btrfs_start_transaction(cur_root, 1);
2142 btrfs_release_path(&path);
2144 ret = btrfs_commit_transaction(trans, cur_root);
2147 if (num_extents > 0 && pass++ < 16)
2150 ret = (num_extents > 0) ? -1 : 0;
2152 btrfs_release_path(&path);
2153 extent_io_tree_cleanup(&reloc_tree);
2158 * relocate data in system chunk
2160 static int cleanup_sys_chunk(struct btrfs_root *fs_root,
2161 struct btrfs_root *image_root)
2163 struct btrfs_block_group_cache *cache;
2169 cache = btrfs_lookup_block_group(fs_root->fs_info, offset);
2173 end_byte = cache->key.objectid + cache->key.offset;
2174 if (cache->flags & BTRFS_BLOCK_GROUP_SYSTEM) {
2175 ret = relocate_extents_range(fs_root, image_root,
2176 cache->key.objectid,
2183 for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
2184 offset = btrfs_sb_offset(i);
2185 offset &= ~((u64)BTRFS_STRIPE_LEN - 1);
2187 ret = relocate_extents_range(fs_root, image_root,
2188 offset, offset + BTRFS_STRIPE_LEN);
2197 static int fixup_chunk_mapping(struct btrfs_root *root)
2199 struct btrfs_trans_handle *trans;
2200 struct btrfs_fs_info *info = root->fs_info;
2201 struct btrfs_root *chunk_root = info->chunk_root;
2202 struct extent_buffer *leaf;
2203 struct btrfs_key key;
2204 struct btrfs_path path;
2205 struct btrfs_chunk chunk;
2211 btrfs_init_path(&path);
2213 trans = btrfs_start_transaction(root, 1);
2217 * recow the whole chunk tree. this will move all chunk tree blocks
2218 * into system block group.
2220 memset(&key, 0, sizeof(key));
2222 ret = btrfs_search_slot(trans, chunk_root, &key, &path, 0, 1);
2226 ret = btrfs_next_leaf(chunk_root, &path);
2232 btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]);
2233 btrfs_release_path(&path);
2235 btrfs_release_path(&path);
2237 /* fixup the system chunk array in super block */
2238 btrfs_set_super_sys_array_size(info->super_copy, 0);
2240 key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID;
2242 key.type = BTRFS_CHUNK_ITEM_KEY;
2244 ret = btrfs_search_slot(trans, chunk_root, &key, &path, 0, 0);
2249 leaf = path.nodes[0];
2250 if (path.slots[0] >= btrfs_header_nritems(leaf)) {
2251 ret = btrfs_next_leaf(chunk_root, &path);
2256 leaf = path.nodes[0];
2258 btrfs_item_key_to_cpu(leaf, &key, path.slots[0]);
2259 if (key.type != BTRFS_CHUNK_ITEM_KEY)
2262 ptr = btrfs_item_ptr_offset(leaf, path.slots[0]);
2263 size = btrfs_item_size_nr(leaf, path.slots[0]);
2264 BUG_ON(size != sizeof(chunk));
2265 read_extent_buffer(leaf, &chunk, ptr, size);
2266 type = btrfs_stack_chunk_type(&chunk);
2268 if (!(type & BTRFS_BLOCK_GROUP_SYSTEM))
2271 ret = btrfs_add_system_chunk(trans, chunk_root, &key,
2279 ret = btrfs_commit_transaction(trans, root);
2282 btrfs_release_path(&path);
2286 static int do_convert(const char *devname, int datacsum, int packing, int noxattr,
2287 u32 nodesize, int copylabel, const char *fslabel, int progress,
2290 int i, ret, blocks_per_node;
2296 ext2_filsys ext2_fs;
2297 struct btrfs_root *root;
2298 struct btrfs_root *image_root;
2299 struct task_ctx ctx;
2300 char features_buf[64];
2301 struct btrfs_mkfs_config mkfs_cfg;
2303 ret = open_ext2fs(devname, &ext2_fs);
2305 fprintf(stderr, "unable to open the Ext2fs\n");
2308 blocksize = ext2_fs->blocksize;
2309 total_bytes = (u64)ext2_fs->super->s_blocks_count * blocksize;
2310 if (blocksize < 4096) {
2311 fprintf(stderr, "block size is too small\n");
2314 if (!(ext2_fs->super->s_feature_incompat &
2315 EXT2_FEATURE_INCOMPAT_FILETYPE)) {
2316 fprintf(stderr, "filetype feature is missing\n");
2319 if (btrfs_check_nodesize(nodesize, blocksize))
2321 blocks_per_node = nodesize / blocksize;
2322 ret = -blocks_per_node;
2323 for (i = 0; i < 7; i++) {
2324 if (nodesize == blocksize)
2325 ret = ext2_alloc_block(ext2_fs, 0, blocks + i);
2327 ret = ext2_alloc_block_range(ext2_fs,
2328 ret + blocks_per_node, blocks_per_node,
2331 fprintf(stderr, "not enough free space\n");
2334 blocks[i] *= blocksize;
2336 super_bytenr = blocks[0];
2337 fd = open(devname, O_RDWR);
2339 fprintf(stderr, "unable to open %s\n", devname);
2342 btrfs_parse_features_to_string(features_buf, features);
2343 if (features == BTRFS_MKFS_DEFAULT_FEATURES)
2344 strcat(features_buf, " (default)");
2346 printf("create btrfs filesystem:\n");
2347 printf("\tblocksize: %u\n", blocksize);
2348 printf("\tnodesize: %u\n", nodesize);
2349 printf("\tfeatures: %s\n", features_buf);
2351 mkfs_cfg.label = ext2_fs->super->s_volume_name;
2352 mkfs_cfg.fs_uuid = NULL;
2353 memcpy(mkfs_cfg.blocks, blocks, sizeof(blocks));
2354 mkfs_cfg.num_bytes = total_bytes;
2355 mkfs_cfg.nodesize = nodesize;
2356 mkfs_cfg.sectorsize = blocksize;
2357 mkfs_cfg.stripesize = blocksize;
2358 mkfs_cfg.features = features;
2360 ret = make_btrfs(fd, &mkfs_cfg);
2362 fprintf(stderr, "unable to create initial ctree: %s\n",
2366 /* create a system chunk that maps the whole device */
2367 ret = prepare_system_chunk(fd, super_bytenr);
2369 fprintf(stderr, "unable to update system chunk\n");
2372 root = open_ctree_fd(fd, devname, super_bytenr, OPEN_CTREE_WRITES);
2374 fprintf(stderr, "unable to open ctree\n");
2377 ret = cache_free_extents(root, ext2_fs);
2379 fprintf(stderr, "error during cache_free_extents %d\n", ret);
2382 root->fs_info->extent_ops = &extent_ops;
2383 /* recover block allocation bitmap */
2384 for (i = 0; i < 7; i++) {
2385 blocks[i] /= blocksize;
2386 if (nodesize == blocksize)
2387 ext2_free_block(ext2_fs, blocks[i]);
2389 ext2_free_block_range(ext2_fs, blocks[i],
2392 ret = init_btrfs(root);
2394 fprintf(stderr, "unable to setup the root tree\n");
2397 printf("creating btrfs metadata.\n");
2398 ctx.max_copy_inodes = (ext2_fs->super->s_inodes_count
2399 - ext2_fs->super->s_free_inodes_count);
2400 ctx.cur_copy_inodes = 0;
2403 ctx.info = task_init(print_copied_inodes, after_copied_inodes, &ctx);
2404 task_start(ctx.info);
2406 ret = copy_inodes(root, ext2_fs, datacsum, packing, noxattr, &ctx);
2408 fprintf(stderr, "error during copy_inodes %d\n", ret);
2412 task_stop(ctx.info);
2413 task_deinit(ctx.info);
2415 printf("creating ext2fs image file.\n");
2416 image_root = link_subvol(root, "ext2_saved", CONV_IMAGE_SUBVOL_OBJECTID);
2418 fprintf(stderr, "unable to create subvol\n");
2421 ret = create_ext2_image(image_root, ext2_fs, "image", datacsum);
2423 fprintf(stderr, "error during create_ext2_image %d\n", ret);
2426 memset(root->fs_info->super_copy->label, 0, BTRFS_LABEL_SIZE);
2427 if (copylabel == 1) {
2428 strncpy(root->fs_info->super_copy->label,
2429 ext2_fs->super->s_volume_name, 16);
2430 fprintf(stderr, "copy label '%s'\n",
2431 root->fs_info->super_copy->label);
2432 } else if (copylabel == -1) {
2433 strncpy(root->fs_info->super_copy->label, fslabel, BTRFS_LABEL_SIZE);
2434 fprintf(stderr, "set label to '%s'\n", fslabel);
2437 printf("cleaning up system chunk.\n");
2438 ret = cleanup_sys_chunk(root, image_root);
2440 fprintf(stderr, "error during cleanup_sys_chunk %d\n", ret);
2443 ret = close_ctree(root);
2445 fprintf(stderr, "error during close_ctree %d\n", ret);
2448 close_ext2fs(ext2_fs);
2451 * If this step succeed, we get a mountable btrfs. Otherwise
2452 * the ext2fs is left unchanged.
2454 ret = migrate_super_block(fd, super_bytenr, blocksize);
2456 fprintf(stderr, "unable to migrate super block\n");
2460 root = open_ctree_fd(fd, devname, 0, OPEN_CTREE_WRITES);
2462 fprintf(stderr, "unable to open ctree\n");
2465 /* move chunk tree into system chunk. */
2466 ret = fixup_chunk_mapping(root);
2468 fprintf(stderr, "error during fixup_chunk_tree\n");
2471 ret = close_ctree(root);
2474 printf("conversion complete.\n");
2479 fprintf(stderr, "conversion aborted.\n");
2483 static int may_rollback(struct btrfs_root *root)
2485 struct btrfs_fs_info *info = root->fs_info;
2486 struct btrfs_multi_bio *multi = NULL;
2494 if (btrfs_super_num_devices(info->super_copy) != 1)
2497 bytenr = BTRFS_SUPER_INFO_OFFSET;
2498 total_bytes = btrfs_super_total_bytes(root->fs_info->super_copy);
2501 ret = btrfs_map_block(&info->mapping_tree, WRITE, bytenr,
2502 &length, &multi, 0, NULL);
2504 if (ret == -ENOENT) {
2505 /* removed block group at the tail */
2506 if (length == (u64)-1)
2509 /* removed block group in the middle */
2515 num_stripes = multi->num_stripes;
2516 physical = multi->stripes[0].physical;
2519 if (num_stripes != 1 || physical != bytenr)
2523 if (bytenr >= total_bytes)
2531 static int do_rollback(const char *devname)
2536 struct btrfs_root *root;
2537 struct btrfs_root *image_root;
2538 struct btrfs_root *chunk_root;
2539 struct btrfs_dir_item *dir;
2540 struct btrfs_inode_item *inode;
2541 struct btrfs_file_extent_item *fi;
2542 struct btrfs_trans_handle *trans;
2543 struct extent_buffer *leaf;
2544 struct btrfs_block_group_cache *cache1;
2545 struct btrfs_block_group_cache *cache2;
2546 struct btrfs_key key;
2547 struct btrfs_path path;
2548 struct extent_io_tree io_tree;
2563 extent_io_tree_init(&io_tree);
2565 fd = open(devname, O_RDWR);
2567 fprintf(stderr, "unable to open %s\n", devname);
2570 root = open_ctree_fd(fd, devname, 0, OPEN_CTREE_WRITES);
2572 fprintf(stderr, "unable to open ctree\n");
2575 ret = may_rollback(root);
2577 fprintf(stderr, "unable to do rollback\n");
2581 sectorsize = root->sectorsize;
2582 buf = malloc(sectorsize);
2584 fprintf(stderr, "unable to allocate memory\n");
2588 btrfs_init_path(&path);
2590 key.objectid = CONV_IMAGE_SUBVOL_OBJECTID;
2591 key.type = BTRFS_ROOT_ITEM_KEY;
2592 key.offset = (u64)-1;
2593 image_root = btrfs_read_fs_root(root->fs_info, &key);
2594 if (!image_root || IS_ERR(image_root)) {
2595 fprintf(stderr, "unable to open subvol %llu\n",
2596 (unsigned long long)key.objectid);
2601 root_dir = btrfs_root_dirid(&root->root_item);
2602 dir = btrfs_lookup_dir_item(NULL, image_root, &path,
2603 root_dir, name, strlen(name), 0);
2604 if (!dir || IS_ERR(dir)) {
2605 fprintf(stderr, "unable to find file %s\n", name);
2608 leaf = path.nodes[0];
2609 btrfs_dir_item_key_to_cpu(leaf, dir, &key);
2610 btrfs_release_path(&path);
2612 objectid = key.objectid;
2614 ret = btrfs_lookup_inode(NULL, image_root, &path, &key, 0);
2616 fprintf(stderr, "unable to find inode item\n");
2619 leaf = path.nodes[0];
2620 inode = btrfs_item_ptr(leaf, path.slots[0], struct btrfs_inode_item);
2621 total_bytes = btrfs_inode_size(leaf, inode);
2622 btrfs_release_path(&path);
2624 key.objectid = objectid;
2626 btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY);
2627 ret = btrfs_search_slot(NULL, image_root, &key, &path, 0, 0);
2629 fprintf(stderr, "unable to find first file extent\n");
2630 btrfs_release_path(&path);
2634 /* build mapping tree for the relocated blocks */
2635 for (offset = 0; offset < total_bytes; ) {
2636 leaf = path.nodes[0];
2637 if (path.slots[0] >= btrfs_header_nritems(leaf)) {
2638 ret = btrfs_next_leaf(root, &path);
2644 btrfs_item_key_to_cpu(leaf, &key, path.slots[0]);
2645 if (key.objectid != objectid || key.offset != offset ||
2646 btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY)
2649 fi = btrfs_item_ptr(leaf, path.slots[0],
2650 struct btrfs_file_extent_item);
2651 if (btrfs_file_extent_type(leaf, fi) != BTRFS_FILE_EXTENT_REG)
2653 if (btrfs_file_extent_compression(leaf, fi) ||
2654 btrfs_file_extent_encryption(leaf, fi) ||
2655 btrfs_file_extent_other_encoding(leaf, fi))
2658 bytenr = btrfs_file_extent_disk_bytenr(leaf, fi);
2659 /* skip holes and direct mapped extents */
2660 if (bytenr == 0 || bytenr == offset)
2663 bytenr += btrfs_file_extent_offset(leaf, fi);
2664 num_bytes = btrfs_file_extent_num_bytes(leaf, fi);
2666 cache1 = btrfs_lookup_block_group(root->fs_info, offset);
2667 cache2 = btrfs_lookup_block_group(root->fs_info,
2668 offset + num_bytes - 1);
2669 if (!cache1 || cache1 != cache2 ||
2670 (!(cache1->flags & BTRFS_BLOCK_GROUP_SYSTEM) &&
2671 !intersect_with_sb(offset, num_bytes)))
2674 set_extent_bits(&io_tree, offset, offset + num_bytes - 1,
2675 EXTENT_LOCKED, GFP_NOFS);
2676 set_state_private(&io_tree, offset, bytenr);
2678 offset += btrfs_file_extent_num_bytes(leaf, fi);
2681 btrfs_release_path(&path);
2683 if (offset < total_bytes) {
2684 fprintf(stderr, "unable to build extent mapping\n");
2688 first_free = BTRFS_SUPER_INFO_OFFSET + 2 * sectorsize - 1;
2689 first_free &= ~((u64)sectorsize - 1);
2690 /* backup for extent #0 should exist */
2691 if(!test_range_bit(&io_tree, 0, first_free - 1, EXTENT_LOCKED, 1)) {
2692 fprintf(stderr, "no backup for the first extent\n");
2695 /* force no allocation from system block group */
2696 root->fs_info->system_allocs = -1;
2697 trans = btrfs_start_transaction(root, 1);
2700 * recow the whole chunk tree, this will remove all chunk tree blocks
2701 * from system block group
2703 chunk_root = root->fs_info->chunk_root;
2704 memset(&key, 0, sizeof(key));
2706 ret = btrfs_search_slot(trans, chunk_root, &key, &path, 0, 1);
2710 ret = btrfs_next_leaf(chunk_root, &path);
2714 btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]);
2715 btrfs_release_path(&path);
2717 btrfs_release_path(&path);
2722 cache1 = btrfs_lookup_block_group(root->fs_info, offset);
2726 if (cache1->flags & BTRFS_BLOCK_GROUP_SYSTEM)
2727 num_bytes += btrfs_block_group_used(&cache1->item);
2729 offset = cache1->key.objectid + cache1->key.offset;
2731 /* only extent #0 left in system block group? */
2732 if (num_bytes > first_free) {
2733 fprintf(stderr, "unable to empty system block group\n");
2736 /* create a system chunk that maps the whole device */
2737 ret = prepare_system_chunk_sb(root->fs_info->super_copy);
2739 fprintf(stderr, "unable to update system chunk\n");
2743 ret = btrfs_commit_transaction(trans, root);
2746 ret = close_ctree(root);
2748 fprintf(stderr, "error during close_ctree %d\n", ret);
2752 /* zero btrfs super block mirrors */
2753 memset(buf, 0, sectorsize);
2754 for (i = 1 ; i < BTRFS_SUPER_MIRROR_MAX; i++) {
2755 bytenr = btrfs_sb_offset(i);
2756 if (bytenr >= total_bytes)
2758 ret = pwrite(fd, buf, sectorsize, bytenr);
2759 if (ret != sectorsize) {
2761 "error during zeroing supreblock %d: %d\n",
2767 sb_bytenr = (u64)-1;
2768 /* copy all relocated blocks back */
2770 ret = find_first_extent_bit(&io_tree, 0, &start, &end,
2775 ret = get_state_private(&io_tree, start, &bytenr);
2778 clear_extent_bits(&io_tree, start, end, EXTENT_LOCKED,
2781 while (start <= end) {
2782 if (start == BTRFS_SUPER_INFO_OFFSET) {
2786 ret = pread(fd, buf, sectorsize, bytenr);
2788 fprintf(stderr, "error during pread %d\n", ret);
2791 BUG_ON(ret != sectorsize);
2792 ret = pwrite(fd, buf, sectorsize, start);
2794 fprintf(stderr, "error during pwrite %d\n", ret);
2797 BUG_ON(ret != sectorsize);
2799 start += sectorsize;
2800 bytenr += sectorsize;
2806 fprintf(stderr, "error during fsync %d\n", ret);
2810 * finally, overwrite btrfs super block.
2812 ret = pread(fd, buf, sectorsize, sb_bytenr);
2814 fprintf(stderr, "error during pread %d\n", ret);
2817 BUG_ON(ret != sectorsize);
2818 ret = pwrite(fd, buf, sectorsize, BTRFS_SUPER_INFO_OFFSET);
2820 fprintf(stderr, "error during pwrite %d\n", ret);
2823 BUG_ON(ret != sectorsize);
2826 fprintf(stderr, "error during fsync %d\n", ret);
2832 extent_io_tree_cleanup(&io_tree);
2833 printf("rollback complete.\n");
2840 fprintf(stderr, "rollback aborted.\n");
2844 static void print_usage(void)
2846 printf("usage: btrfs-convert [options] device\n");
2847 printf("options:\n");
2848 printf("\t-d|--no-datasum disable data checksum, sets NODATASUM\n");
2849 printf("\t-i|--no-xattr ignore xattrs and ACLs\n");
2850 printf("\t-n|--no-inline disable inlining of small files to metadata\n");
2851 printf("\t-N|--nodesize SIZE set filesystem metadata nodesize\n");
2852 printf("\t-r|--rollback roll back to ext2fs\n");
2853 printf("\t-l|--label LABEL set filesystem label\n");
2854 printf("\t-L|--copy-label use label from converted filesystem\n");
2855 printf("\t-p|--progress show converting progress (default)\n");
2856 printf("\t-O|--features LIST comma separated list of filesystem features\n");
2857 printf("\t--no-progress show only overview, not the detailed progress\n");
2860 int main(int argc, char *argv[])
2866 u32 nodesize = max_t(u32, sysconf(_SC_PAGESIZE),
2867 BTRFS_MKFS_DEFAULT_NODE_SIZE);
2870 int usage_error = 0;
2873 char *fslabel = NULL;
2874 u64 features = BTRFS_MKFS_DEFAULT_FEATURES;
2877 enum { GETOPT_VAL_NO_PROGRESS = 256 };
2878 static const struct option long_options[] = {
2879 { "no-progress", no_argument, NULL,
2880 GETOPT_VAL_NO_PROGRESS },
2881 { "no-datasum", no_argument, NULL, 'd' },
2882 { "no-inline", no_argument, NULL, 'n' },
2883 { "no-xattr", no_argument, NULL, 'i' },
2884 { "rollback", no_argument, NULL, 'r' },
2885 { "features", required_argument, NULL, 'O' },
2886 { "progress", no_argument, NULL, 'p' },
2887 { "label", required_argument, NULL, 'l' },
2888 { "copy-label", no_argument, NULL, 'L' },
2889 { "nodesize", required_argument, NULL, 'N' },
2890 { "help", no_argument, NULL, GETOPT_VAL_HELP},
2891 { NULL, 0, NULL, 0 }
2893 int c = getopt_long(argc, argv, "dinN:rl:LpO:", long_options, NULL);
2908 nodesize = parse_size(optarg);
2915 fslabel = strdup(optarg);
2916 if (strlen(fslabel) > BTRFS_LABEL_SIZE) {
2918 "warning: label too long, trimmed to %d bytes\n",
2920 fslabel[BTRFS_LABEL_SIZE] = 0;
2930 char *orig = strdup(optarg);
2933 tmp = btrfs_parse_fs_features(tmp, &features);
2936 "Unrecognized filesystem feature '%s'\n",
2942 if (features & BTRFS_FEATURE_LIST_ALL) {
2943 btrfs_list_all_fs_features(
2944 ~BTRFS_CONVERT_ALLOWED_FEATURES);
2947 if (features & ~BTRFS_CONVERT_ALLOWED_FEATURES) {
2950 btrfs_parse_features_to_string(buf,
2951 features & ~BTRFS_CONVERT_ALLOWED_FEATURES);
2953 "ERROR: features not allowed for convert: %s\n",
2960 case GETOPT_VAL_NO_PROGRESS:
2963 case GETOPT_VAL_HELP:
2966 return c != GETOPT_VAL_HELP;
2969 argc = argc - optind;
2971 if (check_argc_exact(argc, 1)) {
2976 if (rollback && (!datacsum || noxattr || !packing)) {
2978 "Usage error: -d, -i, -n options do not apply to rollback\n");
2987 file = argv[optind];
2988 ret = check_mounted(file);
2990 fprintf(stderr, "Could not check mount status: %s\n",
2994 fprintf(stderr, "%s is mounted\n", file);
2999 ret = do_rollback(file);
3001 ret = do_convert(file, datacsum, packing, noxattr, nodesize,
3002 copylabel, fslabel, progress, features);