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)
214 u64 last = hint_byte;
217 struct btrfs_block_group_cache *cache;
220 ret = find_first_extent_bit(&root->fs_info->free_space_cache,
221 last, &start, &end, EXTENT_DIRTY);
223 if (wrapped++ == 0) {
231 start = max(last, start);
233 if (last - start < num_bytes)
236 last = start + num_bytes;
237 if (test_range_bit(&root->fs_info->pinned_extents,
238 start, last - 1, EXTENT_DIRTY, 0))
241 cache = btrfs_lookup_block_group(root->fs_info, start);
243 if (cache->flags & BTRFS_BLOCK_GROUP_SYSTEM ||
244 last > cache->key.objectid + cache->key.offset) {
245 last = cache->key.objectid + cache->key.offset;
249 clear_extent_dirty(&root->fs_info->free_space_cache,
250 start, start + num_bytes - 1, 0);
252 ins->objectid = start;
253 ins->offset = num_bytes;
254 ins->type = BTRFS_EXTENT_ITEM_KEY;
258 fprintf(stderr, "not enough free space\n");
262 static int intersect_with_sb(u64 bytenr, u64 num_bytes)
267 for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
268 offset = btrfs_sb_offset(i);
269 offset &= ~((u64)BTRFS_STRIPE_LEN - 1);
271 if (bytenr < offset + BTRFS_STRIPE_LEN &&
272 bytenr + num_bytes > offset)
278 static int custom_free_extent(struct btrfs_root *root, u64 bytenr,
281 return intersect_with_sb(bytenr, num_bytes);
284 static struct btrfs_extent_ops extent_ops = {
285 .alloc_extent = custom_alloc_extent,
286 .free_extent = custom_free_extent,
289 struct dir_iterate_data {
290 struct btrfs_trans_handle *trans;
291 struct btrfs_root *root;
292 struct btrfs_inode_item *inode;
299 static u8 filetype_conversion_table[EXT2_FT_MAX] = {
300 [EXT2_FT_UNKNOWN] = BTRFS_FT_UNKNOWN,
301 [EXT2_FT_REG_FILE] = BTRFS_FT_REG_FILE,
302 [EXT2_FT_DIR] = BTRFS_FT_DIR,
303 [EXT2_FT_CHRDEV] = BTRFS_FT_CHRDEV,
304 [EXT2_FT_BLKDEV] = BTRFS_FT_BLKDEV,
305 [EXT2_FT_FIFO] = BTRFS_FT_FIFO,
306 [EXT2_FT_SOCK] = BTRFS_FT_SOCK,
307 [EXT2_FT_SYMLINK] = BTRFS_FT_SYMLINK,
310 static int dir_iterate_proc(ext2_ino_t dir, int entry,
311 struct ext2_dir_entry *dirent,
312 int offset, int blocksize,
313 char *buf,void *priv_data)
319 char dotdot[] = "..";
320 struct btrfs_key location;
321 struct dir_iterate_data *idata = (struct dir_iterate_data *)priv_data;
324 name_len = dirent->name_len & 0xFF;
326 objectid = dirent->inode + INO_OFFSET;
327 if (!strncmp(dirent->name, dotdot, name_len)) {
329 BUG_ON(idata->parent != 0);
330 idata->parent = objectid;
334 if (dirent->inode < EXT2_GOOD_OLD_FIRST_INO)
337 location.objectid = objectid;
339 btrfs_set_key_type(&location, BTRFS_INODE_ITEM_KEY);
341 file_type = dirent->name_len >> 8;
342 BUG_ON(file_type > EXT2_FT_SYMLINK);
343 ret = btrfs_insert_dir_item(idata->trans, idata->root,
344 dirent->name, name_len,
345 idata->objectid, &location,
346 filetype_conversion_table[file_type],
350 ret = btrfs_insert_inode_ref(idata->trans, idata->root,
351 dirent->name, name_len,
352 objectid, idata->objectid,
357 inode_size = btrfs_stack_inode_size(idata->inode) +
359 btrfs_set_stack_inode_size(idata->inode, inode_size);
362 idata->errcode = ret;
366 static int create_dir_entries(struct btrfs_trans_handle *trans,
367 struct btrfs_root *root, u64 objectid,
368 struct btrfs_inode_item *btrfs_inode,
369 ext2_filsys ext2_fs, ext2_ino_t ext2_ino)
373 struct dir_iterate_data data = {
376 .inode = btrfs_inode,
377 .objectid = objectid,
383 err = ext2fs_dir_iterate2(ext2_fs, ext2_ino, 0, NULL,
384 dir_iterate_proc, &data);
388 if (ret == 0 && data.parent == objectid) {
389 ret = btrfs_insert_inode_ref(trans, root, "..", 2,
390 objectid, objectid, 0);
394 fprintf(stderr, "ext2fs_dir_iterate2: %s\n", error_message(err));
398 static int read_disk_extent(struct btrfs_root *root, u64 bytenr,
399 u32 num_bytes, char *buffer)
402 struct btrfs_fs_devices *fs_devs = root->fs_info->fs_devices;
404 ret = pread(fs_devs->latest_bdev, buffer, num_bytes, bytenr);
405 if (ret != num_bytes)
414 static int csum_disk_extent(struct btrfs_trans_handle *trans,
415 struct btrfs_root *root,
416 u64 disk_bytenr, u64 num_bytes)
418 u32 blocksize = root->sectorsize;
423 buffer = malloc(blocksize);
426 for (offset = 0; offset < num_bytes; offset += blocksize) {
427 ret = read_disk_extent(root, disk_bytenr + offset,
431 ret = btrfs_csum_file_block(trans,
432 root->fs_info->csum_root,
433 disk_bytenr + num_bytes,
434 disk_bytenr + offset,
443 struct blk_iterate_data {
444 struct btrfs_trans_handle *trans;
445 struct btrfs_root *root;
446 struct btrfs_inode_item *inode;
456 static void init_blk_iterate_data(struct blk_iterate_data *data,
457 struct btrfs_trans_handle *trans,
458 struct btrfs_root *root,
459 struct btrfs_inode_item *inode,
460 u64 objectid, int checksum)
465 data->objectid = objectid;
466 data->first_block = 0;
467 data->disk_block = 0;
468 data->num_blocks = 0;
469 data->boundary = (u64)-1;
470 data->checksum = checksum;
474 static int record_file_blocks(struct blk_iterate_data *data,
475 u64 file_block, u64 disk_block, u64 num_blocks)
478 struct btrfs_root *root = data->root;
479 u64 file_pos = file_block * root->sectorsize;
480 u64 disk_bytenr = disk_block * root->sectorsize;
481 u64 num_bytes = num_blocks * root->sectorsize;
482 ret = btrfs_record_file_extent(data->trans, data->root,
483 data->objectid, data->inode, file_pos,
484 disk_bytenr, num_bytes);
486 if (ret || !data->checksum || disk_bytenr == 0)
489 return csum_disk_extent(data->trans, data->root, disk_bytenr,
493 static int block_iterate_proc(u64 disk_block, u64 file_block,
494 struct blk_iterate_data *idata)
499 struct btrfs_root *root = idata->root;
500 struct btrfs_block_group_cache *cache;
501 u64 bytenr = disk_block * root->sectorsize;
503 sb_region = intersect_with_sb(bytenr, root->sectorsize);
504 do_barrier = sb_region || disk_block >= idata->boundary;
505 if ((idata->num_blocks > 0 && do_barrier) ||
506 (file_block > idata->first_block + idata->num_blocks) ||
507 (disk_block != idata->disk_block + idata->num_blocks)) {
508 if (idata->num_blocks > 0) {
509 ret = record_file_blocks(idata, idata->first_block,
514 idata->first_block += idata->num_blocks;
515 idata->num_blocks = 0;
517 if (file_block > idata->first_block) {
518 ret = record_file_blocks(idata, idata->first_block,
519 0, file_block - idata->first_block);
525 bytenr += BTRFS_STRIPE_LEN - 1;
526 bytenr &= ~((u64)BTRFS_STRIPE_LEN - 1);
528 cache = btrfs_lookup_block_group(root->fs_info, bytenr);
530 bytenr = cache->key.objectid + cache->key.offset;
533 idata->first_block = file_block;
534 idata->disk_block = disk_block;
535 idata->boundary = bytenr / root->sectorsize;
540 idata->errcode = ret;
544 static int __block_iterate_proc(ext2_filsys fs, blk_t *blocknr,
545 e2_blkcnt_t blockcnt, blk_t ref_block,
546 int ref_offset, void *priv_data)
548 struct blk_iterate_data *idata;
549 idata = (struct blk_iterate_data *)priv_data;
550 return block_iterate_proc(*blocknr, blockcnt, idata);
554 * traverse file's data blocks, record these data blocks as file extents.
556 static int create_file_extents(struct btrfs_trans_handle *trans,
557 struct btrfs_root *root, u64 objectid,
558 struct btrfs_inode_item *btrfs_inode,
559 ext2_filsys ext2_fs, ext2_ino_t ext2_ino,
560 int datacsum, int packing)
566 u32 sectorsize = root->sectorsize;
567 u64 inode_size = btrfs_stack_inode_size(btrfs_inode);
568 struct blk_iterate_data data;
570 init_blk_iterate_data(&data, trans, root, btrfs_inode, objectid,
573 err = ext2fs_block_iterate2(ext2_fs, ext2_ino, BLOCK_FLAG_DATA_ONLY,
574 NULL, __block_iterate_proc, &data);
580 if (packing && data.first_block == 0 && data.num_blocks > 0 &&
581 inode_size <= BTRFS_MAX_INLINE_DATA_SIZE(root)) {
582 u64 num_bytes = data.num_blocks * sectorsize;
583 u64 disk_bytenr = data.disk_block * sectorsize;
586 buffer = malloc(num_bytes);
589 ret = read_disk_extent(root, disk_bytenr, num_bytes, buffer);
592 if (num_bytes > inode_size)
593 num_bytes = inode_size;
594 ret = btrfs_insert_inline_extent(trans, root, objectid,
595 0, buffer, num_bytes);
598 nbytes = btrfs_stack_inode_nbytes(btrfs_inode) + num_bytes;
599 btrfs_set_stack_inode_nbytes(btrfs_inode, nbytes);
600 } else if (data.num_blocks > 0) {
601 ret = record_file_blocks(&data, data.first_block,
602 data.disk_block, data.num_blocks);
606 data.first_block += data.num_blocks;
607 last_block = (inode_size + sectorsize - 1) / sectorsize;
608 if (last_block > data.first_block) {
609 ret = record_file_blocks(&data, data.first_block, 0,
610 last_block - data.first_block);
616 fprintf(stderr, "ext2fs_block_iterate2: %s\n", error_message(err));
620 static int create_symbol_link(struct btrfs_trans_handle *trans,
621 struct btrfs_root *root, u64 objectid,
622 struct btrfs_inode_item *btrfs_inode,
623 ext2_filsys ext2_fs, ext2_ino_t ext2_ino,
624 struct ext2_inode *ext2_inode)
628 u64 inode_size = btrfs_stack_inode_size(btrfs_inode);
629 if (ext2fs_inode_data_blocks(ext2_fs, ext2_inode)) {
630 btrfs_set_stack_inode_size(btrfs_inode, inode_size + 1);
631 ret = create_file_extents(trans, root, objectid, btrfs_inode,
632 ext2_fs, ext2_ino, 1, 1);
633 btrfs_set_stack_inode_size(btrfs_inode, inode_size);
637 pathname = (char *)&(ext2_inode->i_block[0]);
638 BUG_ON(pathname[inode_size] != 0);
639 ret = btrfs_insert_inline_extent(trans, root, objectid, 0,
640 pathname, inode_size + 1);
641 btrfs_set_stack_inode_nbytes(btrfs_inode, inode_size + 1);
646 * Following xattr/acl related codes are based on codes in
647 * fs/ext3/xattr.c and fs/ext3/acl.c
649 #define EXT2_XATTR_BHDR(ptr) ((struct ext2_ext_attr_header *)(ptr))
650 #define EXT2_XATTR_BFIRST(ptr) \
651 ((struct ext2_ext_attr_entry *)(EXT2_XATTR_BHDR(ptr) + 1))
652 #define EXT2_XATTR_IHDR(inode) \
653 ((struct ext2_ext_attr_header *) ((void *)(inode) + \
654 EXT2_GOOD_OLD_INODE_SIZE + (inode)->i_extra_isize))
655 #define EXT2_XATTR_IFIRST(inode) \
656 ((struct ext2_ext_attr_entry *) ((void *)EXT2_XATTR_IHDR(inode) + \
657 sizeof(EXT2_XATTR_IHDR(inode)->h_magic)))
659 static int ext2_xattr_check_names(struct ext2_ext_attr_entry *entry,
662 struct ext2_ext_attr_entry *next;
664 while (!EXT2_EXT_IS_LAST_ENTRY(entry)) {
665 next = EXT2_EXT_ATTR_NEXT(entry);
666 if ((void *)next >= end)
673 static int ext2_xattr_check_block(const char *buf, size_t size)
676 struct ext2_ext_attr_header *header = EXT2_XATTR_BHDR(buf);
678 if (header->h_magic != EXT2_EXT_ATTR_MAGIC ||
679 header->h_blocks != 1)
681 error = ext2_xattr_check_names(EXT2_XATTR_BFIRST(buf), buf + size);
685 static int ext2_xattr_check_entry(struct ext2_ext_attr_entry *entry,
688 size_t value_size = entry->e_value_size;
690 if (entry->e_value_block != 0 || value_size > size ||
691 entry->e_value_offs + value_size > size)
696 #define EXT2_ACL_VERSION 0x0001
698 /* 23.2.5 acl_tag_t values */
700 #define ACL_UNDEFINED_TAG (0x00)
701 #define ACL_USER_OBJ (0x01)
702 #define ACL_USER (0x02)
703 #define ACL_GROUP_OBJ (0x04)
704 #define ACL_GROUP (0x08)
705 #define ACL_MASK (0x10)
706 #define ACL_OTHER (0x20)
708 /* 23.2.7 ACL qualifier constants */
710 #define ACL_UNDEFINED_ID ((id_t)-1)
721 } ext2_acl_entry_short;
727 static inline int ext2_acl_count(size_t size)
730 size -= sizeof(ext2_acl_header);
731 s = size - 4 * sizeof(ext2_acl_entry_short);
733 if (size % sizeof(ext2_acl_entry_short))
735 return size / sizeof(ext2_acl_entry_short);
737 if (s % sizeof(ext2_acl_entry))
739 return s / sizeof(ext2_acl_entry) + 4;
743 #define ACL_EA_VERSION 0x0002
753 acl_ea_entry a_entries[0];
756 static inline size_t acl_ea_size(int count)
758 return sizeof(acl_ea_header) + count * sizeof(acl_ea_entry);
761 static int ext2_acl_to_xattr(void *dst, const void *src,
762 size_t dst_size, size_t src_size)
765 const void *end = src + src_size;
766 acl_ea_header *ext_acl = (acl_ea_header *)dst;
767 acl_ea_entry *dst_entry = ext_acl->a_entries;
768 ext2_acl_entry *src_entry;
770 if (src_size < sizeof(ext2_acl_header))
772 if (((ext2_acl_header *)src)->a_version !=
773 cpu_to_le32(EXT2_ACL_VERSION))
775 src += sizeof(ext2_acl_header);
776 count = ext2_acl_count(src_size);
780 BUG_ON(dst_size < acl_ea_size(count));
781 ext_acl->a_version = cpu_to_le32(ACL_EA_VERSION);
782 for (i = 0; i < count; i++, dst_entry++) {
783 src_entry = (ext2_acl_entry *)src;
784 if (src + sizeof(ext2_acl_entry_short) > end)
786 dst_entry->e_tag = src_entry->e_tag;
787 dst_entry->e_perm = src_entry->e_perm;
788 switch (le16_to_cpu(src_entry->e_tag)) {
793 src += sizeof(ext2_acl_entry_short);
794 dst_entry->e_id = cpu_to_le32(ACL_UNDEFINED_ID);
798 src += sizeof(ext2_acl_entry);
801 dst_entry->e_id = src_entry->e_id;
814 static char *xattr_prefix_table[] = {
816 [2] = "system.posix_acl_access",
817 [3] = "system.posix_acl_default",
822 static int copy_single_xattr(struct btrfs_trans_handle *trans,
823 struct btrfs_root *root, u64 objectid,
824 struct ext2_ext_attr_entry *entry,
825 const void *data, u32 datalen)
830 void *databuf = NULL;
831 char namebuf[XATTR_NAME_MAX + 1];
833 name_index = entry->e_name_index;
834 if (name_index >= ARRAY_SIZE(xattr_prefix_table) ||
835 xattr_prefix_table[name_index] == NULL)
837 name_len = strlen(xattr_prefix_table[name_index]) +
839 if (name_len >= sizeof(namebuf))
842 if (name_index == 2 || name_index == 3) {
843 size_t bufsize = acl_ea_size(ext2_acl_count(datalen));
844 databuf = malloc(bufsize);
847 ret = ext2_acl_to_xattr(databuf, data, bufsize, datalen);
853 strncpy(namebuf, xattr_prefix_table[name_index], XATTR_NAME_MAX);
854 strncat(namebuf, EXT2_EXT_ATTR_NAME(entry), entry->e_name_len);
855 if (name_len + datalen > BTRFS_LEAF_DATA_SIZE(root) -
856 sizeof(struct btrfs_item) - sizeof(struct btrfs_dir_item)) {
857 fprintf(stderr, "skip large xattr on inode %Lu name %.*s\n",
858 objectid - INO_OFFSET, name_len, namebuf);
861 ret = btrfs_insert_xattr_item(trans, root, namebuf, name_len,
862 data, datalen, objectid);
868 static int copy_extended_attrs(struct btrfs_trans_handle *trans,
869 struct btrfs_root *root, u64 objectid,
870 struct btrfs_inode_item *btrfs_inode,
871 ext2_filsys ext2_fs, ext2_ino_t ext2_ino)
877 u32 block_size = ext2_fs->blocksize;
878 u32 inode_size = EXT2_INODE_SIZE(ext2_fs->super);
879 struct ext2_inode_large *ext2_inode;
880 struct ext2_ext_attr_entry *entry;
883 char inode_buf[EXT2_GOOD_OLD_INODE_SIZE];
885 if (inode_size <= EXT2_GOOD_OLD_INODE_SIZE) {
886 ext2_inode = (struct ext2_inode_large *)inode_buf;
888 ext2_inode = (struct ext2_inode_large *)malloc(inode_size);
892 err = ext2fs_read_inode_full(ext2_fs, ext2_ino, (void *)ext2_inode,
895 fprintf(stderr, "ext2fs_read_inode_full: %s\n",
901 if (ext2_ino > ext2_fs->super->s_first_ino &&
902 inode_size > EXT2_GOOD_OLD_INODE_SIZE) {
903 if (EXT2_GOOD_OLD_INODE_SIZE +
904 ext2_inode->i_extra_isize > inode_size) {
908 if (ext2_inode->i_extra_isize != 0 &&
909 EXT2_XATTR_IHDR(ext2_inode)->h_magic ==
910 EXT2_EXT_ATTR_MAGIC) {
916 void *end = (void *)ext2_inode + inode_size;
917 entry = EXT2_XATTR_IFIRST(ext2_inode);
918 total = end - (void *)entry;
919 ret = ext2_xattr_check_names(entry, end);
922 while (!EXT2_EXT_IS_LAST_ENTRY(entry)) {
923 ret = ext2_xattr_check_entry(entry, total);
926 data = (void *)EXT2_XATTR_IFIRST(ext2_inode) +
928 datalen = entry->e_value_size;
929 ret = copy_single_xattr(trans, root, objectid,
930 entry, data, datalen);
933 entry = EXT2_EXT_ATTR_NEXT(entry);
937 if (ext2_inode->i_file_acl == 0)
940 buffer = malloc(block_size);
945 err = ext2fs_read_ext_attr(ext2_fs, ext2_inode->i_file_acl, buffer);
947 fprintf(stderr, "ext2fs_read_ext_attr: %s\n",
952 ret = ext2_xattr_check_block(buffer, block_size);
956 entry = EXT2_XATTR_BFIRST(buffer);
957 while (!EXT2_EXT_IS_LAST_ENTRY(entry)) {
958 ret = ext2_xattr_check_entry(entry, block_size);
961 data = buffer + entry->e_value_offs;
962 datalen = entry->e_value_size;
963 ret = copy_single_xattr(trans, root, objectid,
964 entry, data, datalen);
967 entry = EXT2_EXT_ATTR_NEXT(entry);
971 if ((void *)ext2_inode != inode_buf)
976 #define MKDEV(ma, mi) (((ma) << MINORBITS) | (mi))
978 static inline dev_t old_decode_dev(u16 val)
980 return MKDEV((val >> 8) & 255, val & 255);
983 static inline dev_t new_decode_dev(u32 dev)
985 unsigned major = (dev & 0xfff00) >> 8;
986 unsigned minor = (dev & 0xff) | ((dev >> 12) & 0xfff00);
987 return MKDEV(major, minor);
990 static int copy_inode_item(struct btrfs_inode_item *dst,
991 struct ext2_inode *src, u32 blocksize)
993 btrfs_set_stack_inode_generation(dst, 1);
994 btrfs_set_stack_inode_size(dst, src->i_size);
995 btrfs_set_stack_inode_nbytes(dst, 0);
996 btrfs_set_stack_inode_block_group(dst, 0);
997 btrfs_set_stack_inode_nlink(dst, src->i_links_count);
998 btrfs_set_stack_inode_uid(dst, src->i_uid | (src->i_uid_high << 16));
999 btrfs_set_stack_inode_gid(dst, src->i_gid | (src->i_gid_high << 16));
1000 btrfs_set_stack_inode_mode(dst, src->i_mode);
1001 btrfs_set_stack_inode_rdev(dst, 0);
1002 btrfs_set_stack_inode_flags(dst, 0);
1003 btrfs_set_stack_timespec_sec(&dst->atime, src->i_atime);
1004 btrfs_set_stack_timespec_nsec(&dst->atime, 0);
1005 btrfs_set_stack_timespec_sec(&dst->ctime, src->i_ctime);
1006 btrfs_set_stack_timespec_nsec(&dst->ctime, 0);
1007 btrfs_set_stack_timespec_sec(&dst->mtime, src->i_mtime);
1008 btrfs_set_stack_timespec_nsec(&dst->mtime, 0);
1009 btrfs_set_stack_timespec_sec(&dst->otime, 0);
1010 btrfs_set_stack_timespec_nsec(&dst->otime, 0);
1012 if (S_ISDIR(src->i_mode)) {
1013 btrfs_set_stack_inode_size(dst, 0);
1014 btrfs_set_stack_inode_nlink(dst, 1);
1016 if (S_ISREG(src->i_mode)) {
1017 btrfs_set_stack_inode_size(dst, (u64)src->i_size_high << 32 |
1020 if (!S_ISREG(src->i_mode) && !S_ISDIR(src->i_mode) &&
1021 !S_ISLNK(src->i_mode)) {
1022 if (src->i_block[0]) {
1023 btrfs_set_stack_inode_rdev(dst,
1024 old_decode_dev(src->i_block[0]));
1026 btrfs_set_stack_inode_rdev(dst,
1027 new_decode_dev(src->i_block[1]));
1034 * copy a single inode. do all the required works, such as cloning
1035 * inode item, creating file extents and creating directory entries.
1037 static int copy_single_inode(struct btrfs_trans_handle *trans,
1038 struct btrfs_root *root, u64 objectid,
1039 ext2_filsys ext2_fs, ext2_ino_t ext2_ino,
1040 struct ext2_inode *ext2_inode,
1041 int datacsum, int packing, int noxattr)
1044 struct btrfs_inode_item btrfs_inode;
1046 if (ext2_inode->i_links_count == 0)
1049 copy_inode_item(&btrfs_inode, ext2_inode, ext2_fs->blocksize);
1050 if (!datacsum && S_ISREG(ext2_inode->i_mode)) {
1051 u32 flags = btrfs_stack_inode_flags(&btrfs_inode) |
1052 BTRFS_INODE_NODATASUM;
1053 btrfs_set_stack_inode_flags(&btrfs_inode, flags);
1056 switch (ext2_inode->i_mode & S_IFMT) {
1058 ret = create_file_extents(trans, root, objectid, &btrfs_inode,
1059 ext2_fs, ext2_ino, datacsum, packing);
1062 ret = create_dir_entries(trans, root, objectid, &btrfs_inode,
1066 ret = create_symbol_link(trans, root, objectid, &btrfs_inode,
1067 ext2_fs, ext2_ino, ext2_inode);
1077 ret = copy_extended_attrs(trans, root, objectid, &btrfs_inode,
1082 return btrfs_insert_inode(trans, root, objectid, &btrfs_inode);
1085 static int copy_disk_extent(struct btrfs_root *root, u64 dst_bytenr,
1086 u64 src_bytenr, u32 num_bytes)
1090 struct btrfs_fs_devices *fs_devs = root->fs_info->fs_devices;
1092 buffer = malloc(num_bytes);
1095 ret = pread(fs_devs->latest_bdev, buffer, num_bytes, src_bytenr);
1096 if (ret != num_bytes)
1098 ret = pwrite(fs_devs->latest_bdev, buffer, num_bytes, dst_bytenr);
1099 if (ret != num_bytes)
1109 * scan ext2's inode bitmap and copy all used inodes.
1111 static int copy_inodes(struct btrfs_root *root, ext2_filsys ext2_fs,
1112 int datacsum, int packing, int noxattr, struct task_ctx *p)
1116 ext2_inode_scan ext2_scan;
1117 struct ext2_inode ext2_inode;
1118 ext2_ino_t ext2_ino;
1120 struct btrfs_trans_handle *trans;
1122 trans = btrfs_start_transaction(root, 1);
1125 err = ext2fs_open_inode_scan(ext2_fs, 0, &ext2_scan);
1127 fprintf(stderr, "ext2fs_open_inode_scan: %s\n", error_message(err));
1130 while (!(err = ext2fs_get_next_inode(ext2_scan, &ext2_ino,
1132 /* no more inodes */
1135 /* skip special inode in ext2fs */
1136 if (ext2_ino < EXT2_GOOD_OLD_FIRST_INO &&
1137 ext2_ino != EXT2_ROOT_INO)
1139 objectid = ext2_ino + INO_OFFSET;
1140 ret = copy_single_inode(trans, root,
1141 objectid, ext2_fs, ext2_ino,
1142 &ext2_inode, datacsum, packing,
1144 p->cur_copy_inodes++;
1147 if (trans->blocks_used >= 4096) {
1148 ret = btrfs_commit_transaction(trans, root);
1150 trans = btrfs_start_transaction(root, 1);
1155 fprintf(stderr, "ext2fs_get_next_inode: %s\n", error_message(err));
1158 ret = btrfs_commit_transaction(trans, root);
1165 * Construct a range of ext2fs image file.
1166 * scan block allocation bitmap, find all blocks used by the ext2fs
1167 * in this range and create file extents that point to these blocks.
1169 * Note: Before calling the function, no file extent points to blocks
1172 static int create_image_file_range(struct btrfs_trans_handle *trans,
1173 struct btrfs_root *root, u64 objectid,
1174 struct btrfs_inode_item *inode,
1175 u64 start_byte, u64 end_byte,
1176 ext2_filsys ext2_fs, int datacsum)
1178 u32 blocksize = ext2_fs->blocksize;
1179 u32 block = start_byte / blocksize;
1180 u32 last_block = (end_byte + blocksize - 1) / blocksize;
1182 struct blk_iterate_data data;
1184 init_blk_iterate_data(&data, trans, root, inode, objectid, datacsum);
1185 data.first_block = block;
1187 for (; start_byte < end_byte; block++, start_byte += blocksize) {
1188 if (!ext2fs_fast_test_block_bitmap(ext2_fs->block_map, block))
1190 ret = block_iterate_proc(block, block, &data);
1191 if (ret & BLOCK_ABORT) {
1196 if (data.num_blocks > 0) {
1197 ret = record_file_blocks(&data, data.first_block,
1198 data.disk_block, data.num_blocks);
1201 data.first_block += data.num_blocks;
1203 if (last_block > data.first_block) {
1204 ret = record_file_blocks(&data, data.first_block, 0,
1205 last_block - data.first_block);
1213 * Create the ext2fs image file.
1215 static int create_ext2_image(struct btrfs_root *root, ext2_filsys ext2_fs,
1216 const char *name, int datacsum)
1219 struct btrfs_key key;
1220 struct btrfs_key location;
1221 struct btrfs_path path;
1222 struct btrfs_inode_item btrfs_inode;
1223 struct btrfs_inode_item *inode_item;
1224 struct extent_buffer *leaf;
1225 struct btrfs_fs_info *fs_info = root->fs_info;
1226 struct btrfs_root *extent_root = fs_info->extent_root;
1227 struct btrfs_trans_handle *trans;
1228 struct btrfs_extent_item *ei;
1229 struct btrfs_extent_inline_ref *iref;
1230 struct btrfs_extent_data_ref *dref;
1237 u64 flags = BTRFS_INODE_READONLY;
1238 u32 sectorsize = root->sectorsize;
1240 total_bytes = btrfs_super_total_bytes(fs_info->super_copy);
1241 first_free = BTRFS_SUPER_INFO_OFFSET + sectorsize * 2 - 1;
1242 first_free &= ~((u64)sectorsize - 1);
1244 flags |= BTRFS_INODE_NODATASUM;
1246 memset(&btrfs_inode, 0, sizeof(btrfs_inode));
1247 btrfs_set_stack_inode_generation(&btrfs_inode, 1);
1248 btrfs_set_stack_inode_size(&btrfs_inode, total_bytes);
1249 btrfs_set_stack_inode_nlink(&btrfs_inode, 1);
1250 btrfs_set_stack_inode_nbytes(&btrfs_inode, 0);
1251 btrfs_set_stack_inode_mode(&btrfs_inode, S_IFREG | 0400);
1252 btrfs_set_stack_inode_flags(&btrfs_inode, flags);
1253 btrfs_init_path(&path);
1254 trans = btrfs_start_transaction(root, 1);
1257 objectid = btrfs_root_dirid(&root->root_item);
1258 ret = btrfs_find_free_objectid(trans, root, objectid, &objectid);
1263 * copy blocks covered by extent #0 to new positions. extent #0 is
1264 * special, we can't rely on relocate_extents_range to relocate it.
1266 for (last_byte = 0; last_byte < first_free; last_byte += sectorsize) {
1267 ret = custom_alloc_extent(root, sectorsize, 0, &key);
1270 ret = copy_disk_extent(root, key.objectid, last_byte,
1274 ret = btrfs_record_file_extent(trans, root, objectid,
1275 &btrfs_inode, last_byte,
1276 key.objectid, sectorsize);
1280 ret = csum_disk_extent(trans, root, key.objectid,
1288 key.objectid = last_byte;
1290 btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY);
1291 ret = btrfs_search_slot(trans, fs_info->extent_root,
1296 leaf = path.nodes[0];
1297 if (path.slots[0] >= btrfs_header_nritems(leaf)) {
1298 ret = btrfs_next_leaf(extent_root, &path);
1303 leaf = path.nodes[0];
1305 btrfs_item_key_to_cpu(leaf, &key, path.slots[0]);
1306 if (last_byte > key.objectid ||
1307 key.type != BTRFS_EXTENT_ITEM_KEY) {
1312 bytenr = key.objectid;
1313 num_bytes = key.offset;
1314 ei = btrfs_item_ptr(leaf, path.slots[0],
1315 struct btrfs_extent_item);
1316 if (!(btrfs_extent_flags(leaf, ei) & BTRFS_EXTENT_FLAG_DATA)) {
1321 BUG_ON(btrfs_item_size_nr(leaf, path.slots[0]) != sizeof(*ei) +
1322 btrfs_extent_inline_ref_size(BTRFS_EXTENT_DATA_REF_KEY));
1324 iref = (struct btrfs_extent_inline_ref *)(ei + 1);
1325 key.type = btrfs_extent_inline_ref_type(leaf, iref);
1326 BUG_ON(key.type != BTRFS_EXTENT_DATA_REF_KEY);
1327 dref = (struct btrfs_extent_data_ref *)(&iref->offset);
1328 if (btrfs_extent_data_ref_root(leaf, dref) !=
1329 BTRFS_FS_TREE_OBJECTID) {
1334 if (bytenr > last_byte) {
1335 ret = create_image_file_range(trans, root, objectid,
1336 &btrfs_inode, last_byte,
1342 ret = btrfs_record_file_extent(trans, root, objectid,
1343 &btrfs_inode, bytenr, bytenr,
1347 last_byte = bytenr + num_bytes;
1348 btrfs_release_path(&path);
1350 if (trans->blocks_used >= 4096) {
1351 ret = btrfs_commit_transaction(trans, root);
1353 trans = btrfs_start_transaction(root, 1);
1357 btrfs_release_path(&path);
1358 if (total_bytes > last_byte) {
1359 ret = create_image_file_range(trans, root, objectid,
1360 &btrfs_inode, last_byte,
1361 total_bytes, ext2_fs,
1367 ret = btrfs_insert_inode(trans, root, objectid, &btrfs_inode);
1371 location.objectid = objectid;
1372 location.offset = 0;
1373 btrfs_set_key_type(&location, BTRFS_INODE_ITEM_KEY);
1374 ret = btrfs_insert_dir_item(trans, root, name, strlen(name),
1375 btrfs_root_dirid(&root->root_item),
1376 &location, EXT2_FT_REG_FILE, objectid);
1379 ret = btrfs_insert_inode_ref(trans, root, name, strlen(name),
1381 btrfs_root_dirid(&root->root_item),
1385 location.objectid = btrfs_root_dirid(&root->root_item);
1386 location.offset = 0;
1387 btrfs_set_key_type(&location, BTRFS_INODE_ITEM_KEY);
1388 ret = btrfs_lookup_inode(trans, root, &path, &location, 1);
1391 leaf = path.nodes[0];
1392 inode_item = btrfs_item_ptr(leaf, path.slots[0],
1393 struct btrfs_inode_item);
1394 btrfs_set_inode_size(leaf, inode_item, strlen(name) * 2 +
1395 btrfs_inode_size(leaf, inode_item));
1396 btrfs_mark_buffer_dirty(leaf);
1397 btrfs_release_path(&path);
1398 ret = btrfs_commit_transaction(trans, root);
1401 btrfs_release_path(&path);
1405 static struct btrfs_root * link_subvol(struct btrfs_root *root,
1406 const char *base, u64 root_objectid)
1408 struct btrfs_trans_handle *trans;
1409 struct btrfs_fs_info *fs_info = root->fs_info;
1410 struct btrfs_root *tree_root = fs_info->tree_root;
1411 struct btrfs_root *new_root = NULL;
1412 struct btrfs_path *path;
1413 struct btrfs_inode_item *inode_item;
1414 struct extent_buffer *leaf;
1415 struct btrfs_key key;
1416 u64 dirid = btrfs_root_dirid(&root->root_item);
1418 char buf[BTRFS_NAME_LEN + 1]; /* for snprintf null */
1424 if (len < 1 || len > BTRFS_NAME_LEN)
1427 path = btrfs_alloc_path();
1430 key.objectid = dirid;
1431 key.type = BTRFS_DIR_INDEX_KEY;
1432 key.offset = (u64)-1;
1434 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1437 if (path->slots[0] > 0) {
1439 btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
1440 if (key.objectid == dirid && key.type == BTRFS_DIR_INDEX_KEY)
1441 index = key.offset + 1;
1443 btrfs_release_path(path);
1445 trans = btrfs_start_transaction(root, 1);
1448 key.objectid = dirid;
1450 key.type = BTRFS_INODE_ITEM_KEY;
1452 ret = btrfs_lookup_inode(trans, root, path, &key, 1);
1454 leaf = path->nodes[0];
1455 inode_item = btrfs_item_ptr(leaf, path->slots[0],
1456 struct btrfs_inode_item);
1458 key.objectid = root_objectid;
1459 key.offset = (u64)-1;
1460 key.type = BTRFS_ROOT_ITEM_KEY;
1462 memcpy(buf, base, len);
1463 for (i = 0; i < 1024; i++) {
1464 ret = btrfs_insert_dir_item(trans, root, buf, len,
1465 dirid, &key, BTRFS_FT_DIR, index);
1468 len = snprintf(buf, ARRAY_SIZE(buf), "%s%d", base, i);
1469 if (len < 1 || len > BTRFS_NAME_LEN) {
1477 btrfs_set_inode_size(leaf, inode_item, len * 2 +
1478 btrfs_inode_size(leaf, inode_item));
1479 btrfs_mark_buffer_dirty(leaf);
1480 btrfs_release_path(path);
1482 /* add the backref first */
1483 ret = btrfs_add_root_ref(trans, tree_root, root_objectid,
1484 BTRFS_ROOT_BACKREF_KEY,
1485 root->root_key.objectid,
1486 dirid, index, buf, len);
1489 /* now add the forward ref */
1490 ret = btrfs_add_root_ref(trans, tree_root, root->root_key.objectid,
1491 BTRFS_ROOT_REF_KEY, root_objectid,
1492 dirid, index, buf, len);
1494 ret = btrfs_commit_transaction(trans, root);
1497 new_root = btrfs_read_fs_root(fs_info, &key);
1498 if (IS_ERR(new_root))
1501 btrfs_free_path(path);
1505 static int create_chunk_mapping(struct btrfs_trans_handle *trans,
1506 struct btrfs_root *root)
1508 struct btrfs_fs_info *info = root->fs_info;
1509 struct btrfs_root *chunk_root = info->chunk_root;
1510 struct btrfs_root *extent_root = info->extent_root;
1511 struct btrfs_device *device;
1512 struct btrfs_block_group_cache *cache;
1513 struct btrfs_dev_extent *extent;
1514 struct extent_buffer *leaf;
1515 struct btrfs_chunk chunk;
1516 struct btrfs_key key;
1517 struct btrfs_path path;
1523 btrfs_init_path(&path);
1525 total_bytes = btrfs_super_total_bytes(root->fs_info->super_copy);
1526 chunk_objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID;
1528 BUG_ON(list_empty(&info->fs_devices->devices));
1529 device = list_entry(info->fs_devices->devices.next,
1530 struct btrfs_device, dev_list);
1531 BUG_ON(device->devid != info->fs_devices->latest_devid);
1533 /* delete device extent created by make_btrfs */
1534 key.objectid = device->devid;
1536 key.type = BTRFS_DEV_EXTENT_KEY;
1537 ret = btrfs_search_slot(trans, device->dev_root, &key, &path, -1, 1);
1542 ret = btrfs_del_item(trans, device->dev_root, &path);
1545 btrfs_release_path(&path);
1547 /* delete chunk item created by make_btrfs */
1548 key.objectid = chunk_objectid;
1550 key.type = BTRFS_CHUNK_ITEM_KEY;
1551 ret = btrfs_search_slot(trans, chunk_root, &key, &path, -1, 1);
1556 ret = btrfs_del_item(trans, chunk_root, &path);
1559 btrfs_release_path(&path);
1561 /* for each block group, create device extent and chunk item */
1563 while (cur_start < total_bytes) {
1564 cache = btrfs_lookup_block_group(root->fs_info, cur_start);
1567 /* insert device extent */
1568 key.objectid = device->devid;
1569 key.offset = cache->key.objectid;
1570 key.type = BTRFS_DEV_EXTENT_KEY;
1571 ret = btrfs_insert_empty_item(trans, device->dev_root, &path,
1572 &key, sizeof(*extent));
1576 leaf = path.nodes[0];
1577 extent = btrfs_item_ptr(leaf, path.slots[0],
1578 struct btrfs_dev_extent);
1580 btrfs_set_dev_extent_chunk_tree(leaf, extent,
1581 chunk_root->root_key.objectid);
1582 btrfs_set_dev_extent_chunk_objectid(leaf, extent,
1584 btrfs_set_dev_extent_chunk_offset(leaf, extent,
1585 cache->key.objectid);
1586 btrfs_set_dev_extent_length(leaf, extent, cache->key.offset);
1587 write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid,
1588 (unsigned long)btrfs_dev_extent_chunk_tree_uuid(extent),
1590 btrfs_mark_buffer_dirty(leaf);
1591 btrfs_release_path(&path);
1593 /* insert chunk item */
1594 btrfs_set_stack_chunk_length(&chunk, cache->key.offset);
1595 btrfs_set_stack_chunk_owner(&chunk,
1596 extent_root->root_key.objectid);
1597 btrfs_set_stack_chunk_stripe_len(&chunk, BTRFS_STRIPE_LEN);
1598 btrfs_set_stack_chunk_type(&chunk, cache->flags);
1599 btrfs_set_stack_chunk_io_align(&chunk, device->io_align);
1600 btrfs_set_stack_chunk_io_width(&chunk, device->io_width);
1601 btrfs_set_stack_chunk_sector_size(&chunk, device->sector_size);
1602 btrfs_set_stack_chunk_num_stripes(&chunk, 1);
1603 btrfs_set_stack_chunk_sub_stripes(&chunk, 0);
1604 btrfs_set_stack_stripe_devid(&chunk.stripe, device->devid);
1605 btrfs_set_stack_stripe_offset(&chunk.stripe,
1606 cache->key.objectid);
1607 memcpy(&chunk.stripe.dev_uuid, device->uuid, BTRFS_UUID_SIZE);
1609 key.objectid = chunk_objectid;
1610 key.offset = cache->key.objectid;
1611 key.type = BTRFS_CHUNK_ITEM_KEY;
1613 ret = btrfs_insert_item(trans, chunk_root, &key, &chunk,
1614 btrfs_chunk_item_size(1));
1618 cur_start = cache->key.objectid + cache->key.offset;
1621 device->bytes_used = total_bytes;
1622 ret = btrfs_update_device(trans, device);
1624 btrfs_release_path(&path);
1628 static int create_subvol(struct btrfs_trans_handle *trans,
1629 struct btrfs_root *root, u64 root_objectid)
1631 struct extent_buffer *tmp;
1632 struct btrfs_root *new_root;
1633 struct btrfs_key key;
1634 struct btrfs_root_item root_item;
1637 ret = btrfs_copy_root(trans, root, root->node, &tmp,
1641 memcpy(&root_item, &root->root_item, sizeof(root_item));
1642 btrfs_set_root_bytenr(&root_item, tmp->start);
1643 btrfs_set_root_level(&root_item, btrfs_header_level(tmp));
1644 btrfs_set_root_generation(&root_item, trans->transid);
1645 free_extent_buffer(tmp);
1647 key.objectid = root_objectid;
1648 key.type = BTRFS_ROOT_ITEM_KEY;
1649 key.offset = trans->transid;
1650 ret = btrfs_insert_root(trans, root->fs_info->tree_root,
1653 key.offset = (u64)-1;
1654 new_root = btrfs_read_fs_root(root->fs_info, &key);
1655 BUG_ON(!new_root || IS_ERR(new_root));
1657 ret = btrfs_make_root_dir(trans, new_root, BTRFS_FIRST_FREE_OBJECTID);
1663 static int init_btrfs(struct btrfs_root *root)
1666 struct btrfs_key location;
1667 struct btrfs_trans_handle *trans;
1668 struct btrfs_fs_info *fs_info = root->fs_info;
1669 struct extent_buffer *tmp;
1671 trans = btrfs_start_transaction(root, 1);
1673 ret = btrfs_make_block_groups(trans, root);
1676 ret = btrfs_fix_block_accounting(trans, root);
1679 ret = create_chunk_mapping(trans, root);
1682 ret = btrfs_make_root_dir(trans, fs_info->tree_root,
1683 BTRFS_ROOT_TREE_DIR_OBJECTID);
1686 memcpy(&location, &root->root_key, sizeof(location));
1687 location.offset = (u64)-1;
1688 ret = btrfs_insert_dir_item(trans, fs_info->tree_root, "default", 7,
1689 btrfs_super_root_dir(fs_info->super_copy),
1690 &location, BTRFS_FT_DIR, 0);
1693 ret = btrfs_insert_inode_ref(trans, fs_info->tree_root, "default", 7,
1695 btrfs_super_root_dir(fs_info->super_copy), 0);
1698 btrfs_set_root_dirid(&fs_info->fs_root->root_item,
1699 BTRFS_FIRST_FREE_OBJECTID);
1701 /* subvol for ext2 image file */
1702 ret = create_subvol(trans, root, CONV_IMAGE_SUBVOL_OBJECTID);
1704 /* subvol for data relocation */
1705 ret = create_subvol(trans, root, BTRFS_DATA_RELOC_TREE_OBJECTID);
1708 extent_buffer_get(fs_info->csum_root->node);
1709 ret = __btrfs_cow_block(trans, fs_info->csum_root,
1710 fs_info->csum_root->node, NULL, 0, &tmp, 0, 0);
1712 free_extent_buffer(tmp);
1714 ret = btrfs_commit_transaction(trans, root);
1721 * Migrate super block to its default position and zero 0 ~ 16k
1723 static int migrate_super_block(int fd, u64 old_bytenr, u32 sectorsize)
1726 struct extent_buffer *buf;
1727 struct btrfs_super_block *super;
1731 BUG_ON(sectorsize < sizeof(*super));
1732 buf = malloc(sizeof(*buf) + sectorsize);
1736 buf->len = sectorsize;
1737 ret = pread(fd, buf->data, sectorsize, old_bytenr);
1738 if (ret != sectorsize)
1741 super = (struct btrfs_super_block *)buf->data;
1742 BUG_ON(btrfs_super_bytenr(super) != old_bytenr);
1743 btrfs_set_super_bytenr(super, BTRFS_SUPER_INFO_OFFSET);
1745 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
1746 ret = pwrite(fd, buf->data, sectorsize, BTRFS_SUPER_INFO_OFFSET);
1747 if (ret != sectorsize)
1754 memset(buf->data, 0, sectorsize);
1755 for (bytenr = 0; bytenr < BTRFS_SUPER_INFO_OFFSET; ) {
1756 len = BTRFS_SUPER_INFO_OFFSET - bytenr;
1757 if (len > sectorsize)
1759 ret = pwrite(fd, buf->data, len, bytenr);
1761 fprintf(stderr, "unable to zero fill device\n");
1775 static int prepare_system_chunk_sb(struct btrfs_super_block *super)
1777 struct btrfs_chunk *chunk;
1778 struct btrfs_disk_key *key;
1779 u32 sectorsize = btrfs_super_sectorsize(super);
1781 key = (struct btrfs_disk_key *)(super->sys_chunk_array);
1782 chunk = (struct btrfs_chunk *)(super->sys_chunk_array +
1783 sizeof(struct btrfs_disk_key));
1785 btrfs_set_disk_key_objectid(key, BTRFS_FIRST_CHUNK_TREE_OBJECTID);
1786 btrfs_set_disk_key_type(key, BTRFS_CHUNK_ITEM_KEY);
1787 btrfs_set_disk_key_offset(key, 0);
1789 btrfs_set_stack_chunk_length(chunk, btrfs_super_total_bytes(super));
1790 btrfs_set_stack_chunk_owner(chunk, BTRFS_EXTENT_TREE_OBJECTID);
1791 btrfs_set_stack_chunk_stripe_len(chunk, BTRFS_STRIPE_LEN);
1792 btrfs_set_stack_chunk_type(chunk, BTRFS_BLOCK_GROUP_SYSTEM);
1793 btrfs_set_stack_chunk_io_align(chunk, sectorsize);
1794 btrfs_set_stack_chunk_io_width(chunk, sectorsize);
1795 btrfs_set_stack_chunk_sector_size(chunk, sectorsize);
1796 btrfs_set_stack_chunk_num_stripes(chunk, 1);
1797 btrfs_set_stack_chunk_sub_stripes(chunk, 0);
1798 chunk->stripe.devid = super->dev_item.devid;
1799 btrfs_set_stack_stripe_offset(&chunk->stripe, 0);
1800 memcpy(chunk->stripe.dev_uuid, super->dev_item.uuid, BTRFS_UUID_SIZE);
1801 btrfs_set_super_sys_array_size(super, sizeof(*key) + sizeof(*chunk));
1805 static int prepare_system_chunk(int fd, u64 sb_bytenr)
1808 struct extent_buffer *buf;
1809 struct btrfs_super_block *super;
1811 BUG_ON(BTRFS_SUPER_INFO_SIZE < sizeof(*super));
1812 buf = malloc(sizeof(*buf) + BTRFS_SUPER_INFO_SIZE);
1816 buf->len = BTRFS_SUPER_INFO_SIZE;
1817 ret = pread(fd, buf->data, BTRFS_SUPER_INFO_SIZE, sb_bytenr);
1818 if (ret != BTRFS_SUPER_INFO_SIZE)
1821 super = (struct btrfs_super_block *)buf->data;
1822 BUG_ON(btrfs_super_bytenr(super) != sb_bytenr);
1823 BUG_ON(btrfs_super_num_devices(super) != 1);
1825 ret = prepare_system_chunk_sb(super);
1829 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
1830 ret = pwrite(fd, buf->data, BTRFS_SUPER_INFO_SIZE, sb_bytenr);
1831 if (ret != BTRFS_SUPER_INFO_SIZE)
1842 static int relocate_one_reference(struct btrfs_trans_handle *trans,
1843 struct btrfs_root *root,
1844 u64 extent_start, u64 extent_size,
1845 struct btrfs_key *extent_key,
1846 struct extent_io_tree *reloc_tree)
1848 struct extent_buffer *leaf;
1849 struct btrfs_file_extent_item *fi;
1850 struct btrfs_key key;
1851 struct btrfs_path path;
1852 struct btrfs_inode_item inode;
1853 struct blk_iterate_data data;
1860 u32 sectorsize = root->sectorsize;
1866 btrfs_init_path(&path);
1867 ret = btrfs_search_slot(trans, root, extent_key, &path, -1, 1);
1871 leaf = path.nodes[0];
1872 fi = btrfs_item_ptr(leaf, path.slots[0],
1873 struct btrfs_file_extent_item);
1874 BUG_ON(btrfs_file_extent_offset(leaf, fi) > 0);
1875 if (extent_start != btrfs_file_extent_disk_bytenr(leaf, fi) ||
1876 extent_size != btrfs_file_extent_disk_num_bytes(leaf, fi)) {
1881 bytenr = extent_start + btrfs_file_extent_offset(leaf, fi);
1882 num_bytes = btrfs_file_extent_num_bytes(leaf, fi);
1884 ret = btrfs_del_item(trans, root, &path);
1888 ret = btrfs_free_extent(trans, root, extent_start, extent_size, 0,
1889 root->root_key.objectid,
1890 extent_key->objectid, extent_key->offset);
1894 btrfs_release_path(&path);
1896 key.objectid = extent_key->objectid;
1898 key.type = BTRFS_INODE_ITEM_KEY;
1899 ret = btrfs_lookup_inode(trans, root, &path, &key, 0);
1903 leaf = path.nodes[0];
1904 ptr = btrfs_item_ptr_offset(leaf, path.slots[0]);
1905 read_extent_buffer(leaf, &inode, ptr, sizeof(inode));
1906 btrfs_release_path(&path);
1908 BUG_ON(num_bytes & (sectorsize - 1));
1909 nbytes = btrfs_stack_inode_nbytes(&inode) - num_bytes;
1910 btrfs_set_stack_inode_nbytes(&inode, nbytes);
1911 datacsum = !(btrfs_stack_inode_flags(&inode) & BTRFS_INODE_NODATASUM);
1913 init_blk_iterate_data(&data, trans, root, &inode, extent_key->objectid,
1915 data.first_block = extent_key->offset;
1917 cur_offset = extent_key->offset;
1918 while (num_bytes > 0) {
1919 sector_end = bytenr + sectorsize - 1;
1920 if (test_range_bit(reloc_tree, bytenr, sector_end,
1921 EXTENT_LOCKED, 1)) {
1922 ret = get_state_private(reloc_tree, bytenr, &new_pos);
1925 ret = custom_alloc_extent(root, sectorsize, 0, &key);
1928 new_pos = key.objectid;
1930 if (cur_offset == extent_key->offset) {
1931 fd = root->fs_info->fs_devices->latest_bdev;
1932 readahead(fd, bytenr, num_bytes);
1934 ret = copy_disk_extent(root, new_pos, bytenr,
1938 ret = set_extent_bits(reloc_tree, bytenr, sector_end,
1939 EXTENT_LOCKED, GFP_NOFS);
1941 ret = set_state_private(reloc_tree, bytenr, new_pos);
1945 ret = block_iterate_proc(new_pos / sectorsize,
1946 cur_offset / sectorsize, &data);
1947 if (ret & BLOCK_ABORT) {
1952 cur_offset += sectorsize;
1953 bytenr += sectorsize;
1954 num_bytes -= sectorsize;
1957 if (data.num_blocks > 0) {
1958 ret = record_file_blocks(&data, data.first_block,
1959 data.disk_block, data.num_blocks);
1964 key.objectid = extent_key->objectid;
1966 key.type = BTRFS_INODE_ITEM_KEY;
1967 ret = btrfs_lookup_inode(trans, root, &path, &key, 1);
1971 leaf = path.nodes[0];
1972 ptr = btrfs_item_ptr_offset(leaf, path.slots[0]);
1973 write_extent_buffer(leaf, &inode, ptr, sizeof(inode));
1974 btrfs_mark_buffer_dirty(leaf);
1975 btrfs_release_path(&path);
1978 btrfs_release_path(&path);
1982 static int relocate_extents_range(struct btrfs_root *fs_root,
1983 struct btrfs_root *image_root,
1984 u64 start_byte, u64 end_byte)
1986 struct btrfs_fs_info *info = fs_root->fs_info;
1987 struct btrfs_root *extent_root = info->extent_root;
1988 struct btrfs_root *cur_root = NULL;
1989 struct btrfs_trans_handle *trans;
1990 struct btrfs_extent_data_ref *dref;
1991 struct btrfs_extent_inline_ref *iref;
1992 struct btrfs_extent_item *ei;
1993 struct extent_buffer *leaf;
1994 struct btrfs_key key;
1995 struct btrfs_key extent_key;
1996 struct btrfs_path path;
1997 struct extent_io_tree reloc_tree;
2007 btrfs_init_path(&path);
2008 extent_io_tree_init(&reloc_tree);
2010 key.objectid = start_byte;
2012 key.type = BTRFS_EXTENT_ITEM_KEY;
2013 ret = btrfs_search_slot(NULL, extent_root, &key, &path, 0, 0);
2017 ret = btrfs_previous_item(extent_root, &path, 0,
2018 BTRFS_EXTENT_ITEM_KEY);
2022 leaf = path.nodes[0];
2023 btrfs_item_key_to_cpu(leaf, &key, path.slots[0]);
2024 if (key.objectid + key.offset > start_byte)
2025 start_byte = key.objectid;
2028 btrfs_release_path(&path);
2030 cur_root = (pass % 2 == 0) ? image_root : fs_root;
2033 trans = btrfs_start_transaction(cur_root, 1);
2036 cur_byte = start_byte;
2038 key.objectid = cur_byte;
2040 key.type = BTRFS_EXTENT_ITEM_KEY;
2041 ret = btrfs_search_slot(trans, extent_root,
2046 leaf = path.nodes[0];
2047 if (path.slots[0] >= btrfs_header_nritems(leaf)) {
2048 ret = btrfs_next_leaf(extent_root, &path);
2053 leaf = path.nodes[0];
2056 btrfs_item_key_to_cpu(leaf, &key, path.slots[0]);
2057 if (key.objectid < cur_byte ||
2058 key.type != BTRFS_EXTENT_ITEM_KEY) {
2062 if (key.objectid >= end_byte)
2067 cur_byte = key.objectid;
2068 num_bytes = key.offset;
2069 ei = btrfs_item_ptr(leaf, path.slots[0],
2070 struct btrfs_extent_item);
2071 BUG_ON(!(btrfs_extent_flags(leaf, ei) &
2072 BTRFS_EXTENT_FLAG_DATA));
2074 ptr = btrfs_item_ptr_offset(leaf, path.slots[0]);
2075 end = ptr + btrfs_item_size_nr(leaf, path.slots[0]);
2077 ptr += sizeof(struct btrfs_extent_item);
2080 iref = (struct btrfs_extent_inline_ref *)ptr;
2081 key.type = btrfs_extent_inline_ref_type(leaf, iref);
2082 BUG_ON(key.type != BTRFS_EXTENT_DATA_REF_KEY);
2083 dref = (struct btrfs_extent_data_ref *)(&iref->offset);
2084 ref_root = btrfs_extent_data_ref_root(leaf, dref);
2085 extent_key.objectid =
2086 btrfs_extent_data_ref_objectid(leaf, dref);
2088 btrfs_extent_data_ref_offset(leaf, dref);
2089 extent_key.type = BTRFS_EXTENT_DATA_KEY;
2090 BUG_ON(btrfs_extent_data_ref_count(leaf, dref) != 1);
2092 if (ref_root == cur_root->root_key.objectid)
2095 ptr += btrfs_extent_inline_ref_size(key.type);
2103 ret = relocate_one_reference(trans, cur_root, cur_byte,
2104 num_bytes, &extent_key,
2109 cur_byte += num_bytes;
2110 btrfs_release_path(&path);
2112 if (trans->blocks_used >= 4096) {
2113 ret = btrfs_commit_transaction(trans, cur_root);
2115 trans = btrfs_start_transaction(cur_root, 1);
2119 btrfs_release_path(&path);
2121 ret = btrfs_commit_transaction(trans, cur_root);
2124 if (num_extents > 0 && pass++ < 16)
2127 ret = (num_extents > 0) ? -1 : 0;
2129 btrfs_release_path(&path);
2130 extent_io_tree_cleanup(&reloc_tree);
2135 * relocate data in system chunk
2137 static int cleanup_sys_chunk(struct btrfs_root *fs_root,
2138 struct btrfs_root *image_root)
2140 struct btrfs_block_group_cache *cache;
2146 cache = btrfs_lookup_block_group(fs_root->fs_info, offset);
2150 end_byte = cache->key.objectid + cache->key.offset;
2151 if (cache->flags & BTRFS_BLOCK_GROUP_SYSTEM) {
2152 ret = relocate_extents_range(fs_root, image_root,
2153 cache->key.objectid,
2160 for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
2161 offset = btrfs_sb_offset(i);
2162 offset &= ~((u64)BTRFS_STRIPE_LEN - 1);
2164 ret = relocate_extents_range(fs_root, image_root,
2165 offset, offset + BTRFS_STRIPE_LEN);
2174 static int fixup_chunk_mapping(struct btrfs_root *root)
2176 struct btrfs_trans_handle *trans;
2177 struct btrfs_fs_info *info = root->fs_info;
2178 struct btrfs_root *chunk_root = info->chunk_root;
2179 struct extent_buffer *leaf;
2180 struct btrfs_key key;
2181 struct btrfs_path path;
2182 struct btrfs_chunk chunk;
2188 btrfs_init_path(&path);
2190 trans = btrfs_start_transaction(root, 1);
2194 * recow the whole chunk tree. this will move all chunk tree blocks
2195 * into system block group.
2197 memset(&key, 0, sizeof(key));
2199 ret = btrfs_search_slot(trans, chunk_root, &key, &path, 0, 1);
2203 ret = btrfs_next_leaf(chunk_root, &path);
2209 btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]);
2210 btrfs_release_path(&path);
2212 btrfs_release_path(&path);
2214 /* fixup the system chunk array in super block */
2215 btrfs_set_super_sys_array_size(info->super_copy, 0);
2217 key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID;
2219 key.type = BTRFS_CHUNK_ITEM_KEY;
2221 ret = btrfs_search_slot(trans, chunk_root, &key, &path, 0, 0);
2226 leaf = path.nodes[0];
2227 if (path.slots[0] >= btrfs_header_nritems(leaf)) {
2228 ret = btrfs_next_leaf(chunk_root, &path);
2233 leaf = path.nodes[0];
2235 btrfs_item_key_to_cpu(leaf, &key, path.slots[0]);
2236 if (key.type != BTRFS_CHUNK_ITEM_KEY)
2239 ptr = btrfs_item_ptr_offset(leaf, path.slots[0]);
2240 size = btrfs_item_size_nr(leaf, path.slots[0]);
2241 BUG_ON(size != sizeof(chunk));
2242 read_extent_buffer(leaf, &chunk, ptr, size);
2243 type = btrfs_stack_chunk_type(&chunk);
2245 if (!(type & BTRFS_BLOCK_GROUP_SYSTEM))
2248 ret = btrfs_add_system_chunk(trans, chunk_root, &key,
2256 ret = btrfs_commit_transaction(trans, root);
2259 btrfs_release_path(&path);
2263 static int do_convert(const char *devname, int datacsum, int packing, int noxattr,
2264 u32 nodesize, int copylabel, const char *fslabel, int progress,
2267 int i, ret, blocks_per_node;
2273 ext2_filsys ext2_fs;
2274 struct btrfs_root *root;
2275 struct btrfs_root *image_root;
2276 struct task_ctx ctx;
2277 char features_buf[64];
2279 ret = open_ext2fs(devname, &ext2_fs);
2281 fprintf(stderr, "unable to open the Ext2fs\n");
2284 blocksize = ext2_fs->blocksize;
2285 total_bytes = (u64)ext2_fs->super->s_blocks_count * blocksize;
2286 if (blocksize < 4096) {
2287 fprintf(stderr, "block size is too small\n");
2290 if (!(ext2_fs->super->s_feature_incompat &
2291 EXT2_FEATURE_INCOMPAT_FILETYPE)) {
2292 fprintf(stderr, "filetype feature is missing\n");
2295 if (btrfs_check_nodesize(nodesize, blocksize))
2297 blocks_per_node = nodesize / blocksize;
2298 ret = -blocks_per_node;
2299 for (i = 0; i < 7; i++) {
2300 if (nodesize == blocksize)
2301 ret = ext2_alloc_block(ext2_fs, 0, blocks + i);
2303 ret = ext2_alloc_block_range(ext2_fs,
2304 ret + blocks_per_node, blocks_per_node,
2307 fprintf(stderr, "not enough free space\n");
2310 blocks[i] *= blocksize;
2312 super_bytenr = blocks[0];
2313 fd = open(devname, O_RDWR);
2315 fprintf(stderr, "unable to open %s\n", devname);
2318 btrfs_parse_features_to_string(features_buf, features);
2319 if (features == BTRFS_MKFS_DEFAULT_FEATURES)
2320 strcat(features_buf, " (default)");
2322 printf("create btrfs filesystem:\n");
2323 printf("\tblocksize: %u\n", blocksize);
2324 printf("\tnodesize: %u\n", nodesize);
2325 printf("\tfeatures: %s\n", features_buf);
2326 ret = make_btrfs(fd, devname, ext2_fs->super->s_volume_name,
2327 NULL, blocks, total_bytes, nodesize,
2328 blocksize, blocksize, features);
2330 fprintf(stderr, "unable to create initial ctree: %s\n",
2334 /* create a system chunk that maps the whole device */
2335 ret = prepare_system_chunk(fd, super_bytenr);
2337 fprintf(stderr, "unable to update system chunk\n");
2340 root = open_ctree_fd(fd, devname, super_bytenr, OPEN_CTREE_WRITES);
2342 fprintf(stderr, "unable to open ctree\n");
2345 ret = cache_free_extents(root, ext2_fs);
2347 fprintf(stderr, "error during cache_free_extents %d\n", ret);
2350 root->fs_info->extent_ops = &extent_ops;
2351 /* recover block allocation bitmap */
2352 for (i = 0; i < 7; i++) {
2353 blocks[i] /= blocksize;
2354 if (nodesize == blocksize)
2355 ext2_free_block(ext2_fs, blocks[i]);
2357 ext2_free_block_range(ext2_fs, blocks[i],
2360 ret = init_btrfs(root);
2362 fprintf(stderr, "unable to setup the root tree\n");
2365 printf("creating btrfs metadata.\n");
2366 ctx.max_copy_inodes = (ext2_fs->super->s_inodes_count
2367 - ext2_fs->super->s_free_inodes_count);
2368 ctx.cur_copy_inodes = 0;
2371 ctx.info = task_init(print_copied_inodes, after_copied_inodes, &ctx);
2372 task_start(ctx.info);
2374 ret = copy_inodes(root, ext2_fs, datacsum, packing, noxattr, &ctx);
2376 fprintf(stderr, "error during copy_inodes %d\n", ret);
2380 task_stop(ctx.info);
2381 task_deinit(ctx.info);
2383 printf("creating ext2fs image file.\n");
2384 image_root = link_subvol(root, "ext2_saved", CONV_IMAGE_SUBVOL_OBJECTID);
2386 fprintf(stderr, "unable to create subvol\n");
2389 ret = create_ext2_image(image_root, ext2_fs, "image", datacsum);
2391 fprintf(stderr, "error during create_ext2_image %d\n", ret);
2394 memset(root->fs_info->super_copy->label, 0, BTRFS_LABEL_SIZE);
2395 if (copylabel == 1) {
2396 strncpy(root->fs_info->super_copy->label,
2397 ext2_fs->super->s_volume_name, 16);
2398 fprintf(stderr, "copy label '%s'\n",
2399 root->fs_info->super_copy->label);
2400 } else if (copylabel == -1) {
2401 strncpy(root->fs_info->super_copy->label, fslabel, BTRFS_LABEL_SIZE);
2402 fprintf(stderr, "set label to '%s'\n", fslabel);
2405 printf("cleaning up system chunk.\n");
2406 ret = cleanup_sys_chunk(root, image_root);
2408 fprintf(stderr, "error during cleanup_sys_chunk %d\n", ret);
2411 ret = close_ctree(root);
2413 fprintf(stderr, "error during close_ctree %d\n", ret);
2416 close_ext2fs(ext2_fs);
2419 * If this step succeed, we get a mountable btrfs. Otherwise
2420 * the ext2fs is left unchanged.
2422 ret = migrate_super_block(fd, super_bytenr, blocksize);
2424 fprintf(stderr, "unable to migrate super block\n");
2428 root = open_ctree_fd(fd, devname, 0, OPEN_CTREE_WRITES);
2430 fprintf(stderr, "unable to open ctree\n");
2433 /* move chunk tree into system chunk. */
2434 ret = fixup_chunk_mapping(root);
2436 fprintf(stderr, "error during fixup_chunk_tree\n");
2439 ret = close_ctree(root);
2442 printf("conversion complete.\n");
2447 fprintf(stderr, "conversion aborted.\n");
2451 static int may_rollback(struct btrfs_root *root)
2453 struct btrfs_fs_info *info = root->fs_info;
2454 struct btrfs_multi_bio *multi = NULL;
2462 if (btrfs_super_num_devices(info->super_copy) != 1)
2465 bytenr = BTRFS_SUPER_INFO_OFFSET;
2466 total_bytes = btrfs_super_total_bytes(root->fs_info->super_copy);
2469 ret = btrfs_map_block(&info->mapping_tree, WRITE, bytenr,
2470 &length, &multi, 0, NULL);
2472 if (ret == -ENOENT) {
2473 /* removed block group at the tail */
2474 if (length == (u64)-1)
2477 /* removed block group in the middle */
2483 num_stripes = multi->num_stripes;
2484 physical = multi->stripes[0].physical;
2487 if (num_stripes != 1 || physical != bytenr)
2491 if (bytenr >= total_bytes)
2499 static int do_rollback(const char *devname)
2504 struct btrfs_root *root;
2505 struct btrfs_root *image_root;
2506 struct btrfs_root *chunk_root;
2507 struct btrfs_dir_item *dir;
2508 struct btrfs_inode_item *inode;
2509 struct btrfs_file_extent_item *fi;
2510 struct btrfs_trans_handle *trans;
2511 struct extent_buffer *leaf;
2512 struct btrfs_block_group_cache *cache1;
2513 struct btrfs_block_group_cache *cache2;
2514 struct btrfs_key key;
2515 struct btrfs_path path;
2516 struct extent_io_tree io_tree;
2531 extent_io_tree_init(&io_tree);
2533 fd = open(devname, O_RDWR);
2535 fprintf(stderr, "unable to open %s\n", devname);
2538 root = open_ctree_fd(fd, devname, 0, OPEN_CTREE_WRITES);
2540 fprintf(stderr, "unable to open ctree\n");
2543 ret = may_rollback(root);
2545 fprintf(stderr, "unable to do rollback\n");
2549 sectorsize = root->sectorsize;
2550 buf = malloc(sectorsize);
2552 fprintf(stderr, "unable to allocate memory\n");
2556 btrfs_init_path(&path);
2558 key.objectid = CONV_IMAGE_SUBVOL_OBJECTID;
2559 key.type = BTRFS_ROOT_ITEM_KEY;
2560 key.offset = (u64)-1;
2561 image_root = btrfs_read_fs_root(root->fs_info, &key);
2562 if (!image_root || IS_ERR(image_root)) {
2563 fprintf(stderr, "unable to open subvol %llu\n",
2564 (unsigned long long)key.objectid);
2569 root_dir = btrfs_root_dirid(&root->root_item);
2570 dir = btrfs_lookup_dir_item(NULL, image_root, &path,
2571 root_dir, name, strlen(name), 0);
2572 if (!dir || IS_ERR(dir)) {
2573 fprintf(stderr, "unable to find file %s\n", name);
2576 leaf = path.nodes[0];
2577 btrfs_dir_item_key_to_cpu(leaf, dir, &key);
2578 btrfs_release_path(&path);
2580 objectid = key.objectid;
2582 ret = btrfs_lookup_inode(NULL, image_root, &path, &key, 0);
2584 fprintf(stderr, "unable to find inode item\n");
2587 leaf = path.nodes[0];
2588 inode = btrfs_item_ptr(leaf, path.slots[0], struct btrfs_inode_item);
2589 total_bytes = btrfs_inode_size(leaf, inode);
2590 btrfs_release_path(&path);
2592 key.objectid = objectid;
2594 btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY);
2595 ret = btrfs_search_slot(NULL, image_root, &key, &path, 0, 0);
2597 fprintf(stderr, "unable to find first file extent\n");
2598 btrfs_release_path(&path);
2602 /* build mapping tree for the relocated blocks */
2603 for (offset = 0; offset < total_bytes; ) {
2604 leaf = path.nodes[0];
2605 if (path.slots[0] >= btrfs_header_nritems(leaf)) {
2606 ret = btrfs_next_leaf(root, &path);
2612 btrfs_item_key_to_cpu(leaf, &key, path.slots[0]);
2613 if (key.objectid != objectid || key.offset != offset ||
2614 btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY)
2617 fi = btrfs_item_ptr(leaf, path.slots[0],
2618 struct btrfs_file_extent_item);
2619 if (btrfs_file_extent_type(leaf, fi) != BTRFS_FILE_EXTENT_REG)
2621 if (btrfs_file_extent_compression(leaf, fi) ||
2622 btrfs_file_extent_encryption(leaf, fi) ||
2623 btrfs_file_extent_other_encoding(leaf, fi))
2626 bytenr = btrfs_file_extent_disk_bytenr(leaf, fi);
2627 /* skip holes and direct mapped extents */
2628 if (bytenr == 0 || bytenr == offset)
2631 bytenr += btrfs_file_extent_offset(leaf, fi);
2632 num_bytes = btrfs_file_extent_num_bytes(leaf, fi);
2634 cache1 = btrfs_lookup_block_group(root->fs_info, offset);
2635 cache2 = btrfs_lookup_block_group(root->fs_info,
2636 offset + num_bytes - 1);
2637 if (!cache1 || cache1 != cache2 ||
2638 (!(cache1->flags & BTRFS_BLOCK_GROUP_SYSTEM) &&
2639 !intersect_with_sb(offset, num_bytes)))
2642 set_extent_bits(&io_tree, offset, offset + num_bytes - 1,
2643 EXTENT_LOCKED, GFP_NOFS);
2644 set_state_private(&io_tree, offset, bytenr);
2646 offset += btrfs_file_extent_num_bytes(leaf, fi);
2649 btrfs_release_path(&path);
2651 if (offset < total_bytes) {
2652 fprintf(stderr, "unable to build extent mapping\n");
2656 first_free = BTRFS_SUPER_INFO_OFFSET + 2 * sectorsize - 1;
2657 first_free &= ~((u64)sectorsize - 1);
2658 /* backup for extent #0 should exist */
2659 if(!test_range_bit(&io_tree, 0, first_free - 1, EXTENT_LOCKED, 1)) {
2660 fprintf(stderr, "no backup for the first extent\n");
2663 /* force no allocation from system block group */
2664 root->fs_info->system_allocs = -1;
2665 trans = btrfs_start_transaction(root, 1);
2668 * recow the whole chunk tree, this will remove all chunk tree blocks
2669 * from system block group
2671 chunk_root = root->fs_info->chunk_root;
2672 memset(&key, 0, sizeof(key));
2674 ret = btrfs_search_slot(trans, chunk_root, &key, &path, 0, 1);
2678 ret = btrfs_next_leaf(chunk_root, &path);
2682 btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]);
2683 btrfs_release_path(&path);
2685 btrfs_release_path(&path);
2690 cache1 = btrfs_lookup_block_group(root->fs_info, offset);
2694 if (cache1->flags & BTRFS_BLOCK_GROUP_SYSTEM)
2695 num_bytes += btrfs_block_group_used(&cache1->item);
2697 offset = cache1->key.objectid + cache1->key.offset;
2699 /* only extent #0 left in system block group? */
2700 if (num_bytes > first_free) {
2701 fprintf(stderr, "unable to empty system block group\n");
2704 /* create a system chunk that maps the whole device */
2705 ret = prepare_system_chunk_sb(root->fs_info->super_copy);
2707 fprintf(stderr, "unable to update system chunk\n");
2711 ret = btrfs_commit_transaction(trans, root);
2714 ret = close_ctree(root);
2716 fprintf(stderr, "error during close_ctree %d\n", ret);
2720 /* zero btrfs super block mirrors */
2721 memset(buf, 0, sectorsize);
2722 for (i = 1 ; i < BTRFS_SUPER_MIRROR_MAX; i++) {
2723 bytenr = btrfs_sb_offset(i);
2724 if (bytenr >= total_bytes)
2726 ret = pwrite(fd, buf, sectorsize, bytenr);
2727 if (ret != sectorsize) {
2729 "error during zeroing supreblock %d: %d\n",
2735 sb_bytenr = (u64)-1;
2736 /* copy all relocated blocks back */
2738 ret = find_first_extent_bit(&io_tree, 0, &start, &end,
2743 ret = get_state_private(&io_tree, start, &bytenr);
2746 clear_extent_bits(&io_tree, start, end, EXTENT_LOCKED,
2749 while (start <= end) {
2750 if (start == BTRFS_SUPER_INFO_OFFSET) {
2754 ret = pread(fd, buf, sectorsize, bytenr);
2756 fprintf(stderr, "error during pread %d\n", ret);
2759 BUG_ON(ret != sectorsize);
2760 ret = pwrite(fd, buf, sectorsize, start);
2762 fprintf(stderr, "error during pwrite %d\n", ret);
2765 BUG_ON(ret != sectorsize);
2767 start += sectorsize;
2768 bytenr += sectorsize;
2774 fprintf(stderr, "error during fsync %d\n", ret);
2778 * finally, overwrite btrfs super block.
2780 ret = pread(fd, buf, sectorsize, sb_bytenr);
2782 fprintf(stderr, "error during pread %d\n", ret);
2785 BUG_ON(ret != sectorsize);
2786 ret = pwrite(fd, buf, sectorsize, BTRFS_SUPER_INFO_OFFSET);
2788 fprintf(stderr, "error during pwrite %d\n", ret);
2791 BUG_ON(ret != sectorsize);
2794 fprintf(stderr, "error during fsync %d\n", ret);
2800 extent_io_tree_cleanup(&io_tree);
2801 printf("rollback complete.\n");
2808 fprintf(stderr, "rollback aborted.\n");
2812 static void print_usage(void)
2814 printf("usage: btrfs-convert [options] device\n");
2815 printf("options:\n");
2816 printf("\t-d|--no-datasum disable data checksum, sets NODATASUM\n");
2817 printf("\t-i|--no-xattr ignore xattrs and ACLs\n");
2818 printf("\t-n|--no-inline disable inlining of small files to metadata\n");
2819 printf("\t-N|--nodesize SIZE set filesystem metadata nodesize\n");
2820 printf("\t-r|--rollback roll back to ext2fs\n");
2821 printf("\t-l|--label LABEL set filesystem label\n");
2822 printf("\t-L|--copy-label use label from converted filesystem\n");
2823 printf("\t-p|--progress show converting progress (default)\n");
2824 printf("\t-O|--features LIST comma separated list of filesystem features\n");
2825 printf("\t--no-progress show only overview, not the detailed progress\n");
2828 int main(int argc, char *argv[])
2834 u32 nodesize = max_t(u32, sysconf(_SC_PAGESIZE),
2835 BTRFS_MKFS_DEFAULT_NODE_SIZE);
2838 int usage_error = 0;
2841 char *fslabel = NULL;
2842 u64 features = BTRFS_MKFS_DEFAULT_FEATURES;
2845 enum { GETOPT_VAL_NO_PROGRESS = 256 };
2846 static const struct option long_options[] = {
2847 { "no-progress", no_argument, NULL,
2848 GETOPT_VAL_NO_PROGRESS },
2849 { "no-datasum", no_argument, NULL, 'd' },
2850 { "no-inline", no_argument, NULL, 'n' },
2851 { "no-xattr", no_argument, NULL, 'i' },
2852 { "rollback", no_argument, NULL, 'r' },
2853 { "features", required_argument, NULL, 'O' },
2854 { "progress", no_argument, NULL, 'p' },
2855 { "label", required_argument, NULL, 'l' },
2856 { "copy-label", no_argument, NULL, 'L' },
2857 { "nodesize", required_argument, NULL, 'N' },
2858 { NULL, 0, NULL, 0 }
2860 int c = getopt_long(argc, argv, "dinN:rl:LpO:", long_options, NULL);
2875 nodesize = parse_size(optarg);
2882 fslabel = strdup(optarg);
2883 if (strlen(fslabel) > BTRFS_LABEL_SIZE) {
2885 "warning: label too long, trimmed to %d bytes\n",
2887 fslabel[BTRFS_LABEL_SIZE] = 0;
2897 char *orig = strdup(optarg);
2900 tmp = btrfs_parse_fs_features(tmp, &features);
2903 "Unrecognized filesystem feature '%s'\n",
2909 if (features & BTRFS_FEATURE_LIST_ALL) {
2910 btrfs_list_all_fs_features(
2911 ~BTRFS_CONVERT_ALLOWED_FEATURES);
2914 if (features & ~BTRFS_CONVERT_ALLOWED_FEATURES) {
2917 btrfs_parse_features_to_string(buf,
2918 features & ~BTRFS_CONVERT_ALLOWED_FEATURES);
2920 "ERROR: features not allowed for convert: %s\n",
2927 case GETOPT_VAL_NO_PROGRESS:
2935 argc = argc - optind;
2937 if (check_argc_exact(argc, 1)) {
2942 if (rollback && (!datacsum || noxattr || !packing)) {
2944 "Usage error: -d, -i, -n options do not apply to rollback\n");
2953 file = argv[optind];
2954 ret = check_mounted(file);
2956 fprintf(stderr, "Could not check mount status: %s\n",
2960 fprintf(stderr, "%s is mounted\n", file);
2965 ret = do_rollback(file);
2967 ret = do_convert(file, datacsum, packing, noxattr, nodesize,
2968 copylabel, fslabel, progress, features);