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)
81 * Open Ext2fs in readonly mode, read block allocation bitmap and
82 * inode bitmap into memory.
84 static int open_ext2fs(const char *name, ext2_filsys *ret_fs)
89 ret = ext2fs_open(name, 0, 0, 0, unix_io_manager, &ext2_fs);
91 fprintf(stderr, "ext2fs_open: %s\n", error_message(ret));
94 ret = ext2fs_read_inode_bitmap(ext2_fs);
96 fprintf(stderr, "ext2fs_read_inode_bitmap: %s\n",
100 ret = ext2fs_read_block_bitmap(ext2_fs);
102 fprintf(stderr, "ext2fs_read_block_bitmap: %s\n",
107 * search each block group for a free inode. this set up
108 * uninit block/inode bitmaps appropriately.
111 while (ino <= ext2_fs->super->s_inodes_count) {
113 ext2fs_new_inode(ext2_fs, ino, 0, NULL, &foo);
114 ino += EXT2_INODES_PER_GROUP(ext2_fs->super);
123 static int close_ext2fs(ext2_filsys fs)
129 static int ext2_alloc_block(ext2_filsys fs, u64 goal, u64 *block_ret)
133 if (!ext2fs_new_block(fs, goal, NULL, &block)) {
134 ext2fs_fast_mark_block_bitmap(fs->block_map, block);
141 static int ext2_alloc_block_range(ext2_filsys fs, u64 goal, int num,
145 ext2fs_block_bitmap bitmap = fs->block_map;
146 blk_t start = ext2fs_get_block_bitmap_start(bitmap);
147 blk_t end = ext2fs_get_block_bitmap_end(bitmap);
149 for (block = max_t(u64, goal, start); block + num < end; block++) {
150 if (ext2fs_fast_test_block_bitmap_range(bitmap, block, num)) {
151 ext2fs_fast_mark_block_bitmap_range(bitmap, block,
160 static int ext2_free_block(ext2_filsys fs, u64 block)
162 BUG_ON(block != (blk_t)block);
163 ext2fs_fast_unmark_block_bitmap(fs->block_map, block);
167 static int ext2_free_block_range(ext2_filsys fs, u64 block, int num)
169 BUG_ON(block != (blk_t)block);
170 ext2fs_fast_unmark_block_bitmap_range(fs->block_map, block, num);
174 static int cache_free_extents(struct btrfs_root *root, ext2_filsys ext2_fs)
180 u64 blocksize = ext2_fs->blocksize;
182 block = ext2_fs->super->s_first_data_block;
183 for (; block < ext2_fs->super->s_blocks_count; block++) {
184 if (ext2fs_fast_test_block_bitmap(ext2_fs->block_map, block))
186 bytenr = block * blocksize;
187 ret = set_extent_dirty(&root->fs_info->free_space_cache,
188 bytenr, bytenr + blocksize - 1, 0);
192 for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
193 bytenr = btrfs_sb_offset(i);
194 bytenr &= ~((u64)BTRFS_STRIPE_LEN - 1);
195 if (bytenr >= blocksize * ext2_fs->super->s_blocks_count)
197 clear_extent_dirty(&root->fs_info->free_space_cache, bytenr,
198 bytenr + BTRFS_STRIPE_LEN - 1, 0);
201 clear_extent_dirty(&root->fs_info->free_space_cache,
202 0, BTRFS_SUPER_INFO_OFFSET - 1, 0);
207 static int custom_alloc_extent(struct btrfs_root *root, u64 num_bytes,
208 u64 hint_byte, struct btrfs_key *ins,
213 u64 last = hint_byte;
216 struct btrfs_block_group_cache *cache;
219 ret = find_first_extent_bit(&root->fs_info->free_space_cache,
220 last, &start, &end, EXTENT_DIRTY);
222 if (wrapped++ == 0) {
230 start = max(last, start);
232 if (last - start < num_bytes)
235 last = start + num_bytes;
236 if (test_range_bit(&root->fs_info->pinned_extents,
237 start, last - 1, EXTENT_DIRTY, 0))
240 cache = btrfs_lookup_block_group(root->fs_info, start);
242 if (cache->flags & BTRFS_BLOCK_GROUP_SYSTEM ||
243 last > cache->key.objectid + cache->key.offset) {
244 last = cache->key.objectid + cache->key.offset;
249 BUG_ON(num_bytes != root->nodesize);
250 if (check_crossing_stripes(start, num_bytes)) {
251 last = round_down(start + num_bytes,
256 clear_extent_dirty(&root->fs_info->free_space_cache,
257 start, start + num_bytes - 1, 0);
259 ins->objectid = start;
260 ins->offset = num_bytes;
261 ins->type = BTRFS_EXTENT_ITEM_KEY;
265 fprintf(stderr, "not enough free space\n");
269 static int intersect_with_sb(u64 bytenr, u64 num_bytes)
274 for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
275 offset = btrfs_sb_offset(i);
276 offset &= ~((u64)BTRFS_STRIPE_LEN - 1);
278 if (bytenr < offset + BTRFS_STRIPE_LEN &&
279 bytenr + num_bytes > offset)
285 static int custom_free_extent(struct btrfs_root *root, u64 bytenr,
288 return intersect_with_sb(bytenr, num_bytes);
291 static struct btrfs_extent_ops extent_ops = {
292 .alloc_extent = custom_alloc_extent,
293 .free_extent = custom_free_extent,
296 static int convert_insert_dirent(struct btrfs_trans_handle *trans,
297 struct btrfs_root *root,
298 const char *name, size_t name_len,
299 u64 dir, u64 objectid,
300 u8 file_type, u64 index_cnt,
301 struct btrfs_inode_item *inode)
305 struct btrfs_key location = {
306 .objectid = objectid,
308 .type = BTRFS_INODE_ITEM_KEY,
311 ret = btrfs_insert_dir_item(trans, root, name, name_len,
312 dir, &location, file_type, index_cnt);
315 ret = btrfs_insert_inode_ref(trans, root, name, name_len,
316 objectid, dir, index_cnt);
319 inode_size = btrfs_stack_inode_size(inode) + name_len * 2;
320 btrfs_set_stack_inode_size(inode, inode_size);
325 struct dir_iterate_data {
326 struct btrfs_trans_handle *trans;
327 struct btrfs_root *root;
328 struct btrfs_inode_item *inode;
335 static u8 filetype_conversion_table[EXT2_FT_MAX] = {
336 [EXT2_FT_UNKNOWN] = BTRFS_FT_UNKNOWN,
337 [EXT2_FT_REG_FILE] = BTRFS_FT_REG_FILE,
338 [EXT2_FT_DIR] = BTRFS_FT_DIR,
339 [EXT2_FT_CHRDEV] = BTRFS_FT_CHRDEV,
340 [EXT2_FT_BLKDEV] = BTRFS_FT_BLKDEV,
341 [EXT2_FT_FIFO] = BTRFS_FT_FIFO,
342 [EXT2_FT_SOCK] = BTRFS_FT_SOCK,
343 [EXT2_FT_SYMLINK] = BTRFS_FT_SYMLINK,
346 static int dir_iterate_proc(ext2_ino_t dir, int entry,
347 struct ext2_dir_entry *dirent,
348 int offset, int blocksize,
349 char *buf,void *priv_data)
354 char dotdot[] = "..";
355 struct dir_iterate_data *idata = (struct dir_iterate_data *)priv_data;
358 name_len = dirent->name_len & 0xFF;
360 objectid = dirent->inode + INO_OFFSET;
361 if (!strncmp(dirent->name, dotdot, name_len)) {
363 BUG_ON(idata->parent != 0);
364 idata->parent = objectid;
368 if (dirent->inode < EXT2_GOOD_OLD_FIRST_INO)
371 file_type = dirent->name_len >> 8;
372 BUG_ON(file_type > EXT2_FT_SYMLINK);
374 ret = convert_insert_dirent(idata->trans, idata->root, dirent->name,
375 name_len, idata->objectid, objectid,
376 filetype_conversion_table[file_type],
377 idata->index_cnt, idata->inode);
379 idata->errcode = ret;
387 static int create_dir_entries(struct btrfs_trans_handle *trans,
388 struct btrfs_root *root, u64 objectid,
389 struct btrfs_inode_item *btrfs_inode,
390 ext2_filsys ext2_fs, ext2_ino_t ext2_ino)
394 struct dir_iterate_data data = {
397 .inode = btrfs_inode,
398 .objectid = objectid,
404 err = ext2fs_dir_iterate2(ext2_fs, ext2_ino, 0, NULL,
405 dir_iterate_proc, &data);
409 if (ret == 0 && data.parent == objectid) {
410 ret = btrfs_insert_inode_ref(trans, root, "..", 2,
411 objectid, objectid, 0);
415 fprintf(stderr, "ext2fs_dir_iterate2: %s\n", error_message(err));
419 static int read_disk_extent(struct btrfs_root *root, u64 bytenr,
420 u32 num_bytes, char *buffer)
423 struct btrfs_fs_devices *fs_devs = root->fs_info->fs_devices;
425 ret = pread(fs_devs->latest_bdev, buffer, num_bytes, bytenr);
426 if (ret != num_bytes)
435 static int csum_disk_extent(struct btrfs_trans_handle *trans,
436 struct btrfs_root *root,
437 u64 disk_bytenr, u64 num_bytes)
439 u32 blocksize = root->sectorsize;
444 buffer = malloc(blocksize);
447 for (offset = 0; offset < num_bytes; offset += blocksize) {
448 ret = read_disk_extent(root, disk_bytenr + offset,
452 ret = btrfs_csum_file_block(trans,
453 root->fs_info->csum_root,
454 disk_bytenr + num_bytes,
455 disk_bytenr + offset,
464 struct blk_iterate_data {
465 struct btrfs_trans_handle *trans;
466 struct btrfs_root *root;
467 struct btrfs_inode_item *inode;
477 static void init_blk_iterate_data(struct blk_iterate_data *data,
478 struct btrfs_trans_handle *trans,
479 struct btrfs_root *root,
480 struct btrfs_inode_item *inode,
481 u64 objectid, int checksum)
486 data->objectid = objectid;
487 data->first_block = 0;
488 data->disk_block = 0;
489 data->num_blocks = 0;
490 data->boundary = (u64)-1;
491 data->checksum = checksum;
495 static int record_file_blocks(struct blk_iterate_data *data,
496 u64 file_block, u64 disk_block, u64 num_blocks)
499 struct btrfs_root *root = data->root;
500 u64 file_pos = file_block * root->sectorsize;
501 u64 disk_bytenr = disk_block * root->sectorsize;
502 u64 num_bytes = num_blocks * root->sectorsize;
503 ret = btrfs_record_file_extent(data->trans, data->root,
504 data->objectid, data->inode, file_pos,
505 disk_bytenr, num_bytes);
507 if (ret || !data->checksum || disk_bytenr == 0)
510 return csum_disk_extent(data->trans, data->root, disk_bytenr,
514 static int block_iterate_proc(u64 disk_block, u64 file_block,
515 struct blk_iterate_data *idata)
520 struct btrfs_root *root = idata->root;
521 struct btrfs_block_group_cache *cache;
522 u64 bytenr = disk_block * root->sectorsize;
524 sb_region = intersect_with_sb(bytenr, root->sectorsize);
525 do_barrier = sb_region || disk_block >= idata->boundary;
526 if ((idata->num_blocks > 0 && do_barrier) ||
527 (file_block > idata->first_block + idata->num_blocks) ||
528 (disk_block != idata->disk_block + idata->num_blocks)) {
529 if (idata->num_blocks > 0) {
530 ret = record_file_blocks(idata, idata->first_block,
535 idata->first_block += idata->num_blocks;
536 idata->num_blocks = 0;
538 if (file_block > idata->first_block) {
539 ret = record_file_blocks(idata, idata->first_block,
540 0, file_block - idata->first_block);
546 bytenr += BTRFS_STRIPE_LEN - 1;
547 bytenr &= ~((u64)BTRFS_STRIPE_LEN - 1);
549 cache = btrfs_lookup_block_group(root->fs_info, bytenr);
551 bytenr = cache->key.objectid + cache->key.offset;
554 idata->first_block = file_block;
555 idata->disk_block = disk_block;
556 idata->boundary = bytenr / root->sectorsize;
563 static int __block_iterate_proc(ext2_filsys fs, blk_t *blocknr,
564 e2_blkcnt_t blockcnt, blk_t ref_block,
565 int ref_offset, void *priv_data)
568 struct blk_iterate_data *idata;
569 idata = (struct blk_iterate_data *)priv_data;
570 ret = block_iterate_proc(*blocknr, blockcnt, idata);
572 idata->errcode = ret;
579 * traverse file's data blocks, record these data blocks as file extents.
581 static int create_file_extents(struct btrfs_trans_handle *trans,
582 struct btrfs_root *root, u64 objectid,
583 struct btrfs_inode_item *btrfs_inode,
584 ext2_filsys ext2_fs, ext2_ino_t ext2_ino,
585 int datacsum, int packing)
591 u32 sectorsize = root->sectorsize;
592 u64 inode_size = btrfs_stack_inode_size(btrfs_inode);
593 struct blk_iterate_data data;
595 init_blk_iterate_data(&data, trans, root, btrfs_inode, objectid,
598 err = ext2fs_block_iterate2(ext2_fs, ext2_ino, BLOCK_FLAG_DATA_ONLY,
599 NULL, __block_iterate_proc, &data);
605 if (packing && data.first_block == 0 && data.num_blocks > 0 &&
606 inode_size <= BTRFS_MAX_INLINE_DATA_SIZE(root)) {
607 u64 num_bytes = data.num_blocks * sectorsize;
608 u64 disk_bytenr = data.disk_block * sectorsize;
611 buffer = malloc(num_bytes);
614 ret = read_disk_extent(root, disk_bytenr, num_bytes, buffer);
617 if (num_bytes > inode_size)
618 num_bytes = inode_size;
619 ret = btrfs_insert_inline_extent(trans, root, objectid,
620 0, buffer, num_bytes);
623 nbytes = btrfs_stack_inode_nbytes(btrfs_inode) + num_bytes;
624 btrfs_set_stack_inode_nbytes(btrfs_inode, nbytes);
625 } else if (data.num_blocks > 0) {
626 ret = record_file_blocks(&data, data.first_block,
627 data.disk_block, data.num_blocks);
631 data.first_block += data.num_blocks;
632 last_block = (inode_size + sectorsize - 1) / sectorsize;
633 if (last_block > data.first_block) {
634 ret = record_file_blocks(&data, data.first_block, 0,
635 last_block - data.first_block);
641 fprintf(stderr, "ext2fs_block_iterate2: %s\n", error_message(err));
645 static int create_symbol_link(struct btrfs_trans_handle *trans,
646 struct btrfs_root *root, u64 objectid,
647 struct btrfs_inode_item *btrfs_inode,
648 ext2_filsys ext2_fs, ext2_ino_t ext2_ino,
649 struct ext2_inode *ext2_inode)
653 u64 inode_size = btrfs_stack_inode_size(btrfs_inode);
654 if (ext2fs_inode_data_blocks(ext2_fs, ext2_inode)) {
655 btrfs_set_stack_inode_size(btrfs_inode, inode_size + 1);
656 ret = create_file_extents(trans, root, objectid, btrfs_inode,
657 ext2_fs, ext2_ino, 1, 1);
658 btrfs_set_stack_inode_size(btrfs_inode, inode_size);
662 pathname = (char *)&(ext2_inode->i_block[0]);
663 BUG_ON(pathname[inode_size] != 0);
664 ret = btrfs_insert_inline_extent(trans, root, objectid, 0,
665 pathname, inode_size + 1);
666 btrfs_set_stack_inode_nbytes(btrfs_inode, inode_size + 1);
671 * Following xattr/acl related codes are based on codes in
672 * fs/ext3/xattr.c and fs/ext3/acl.c
674 #define EXT2_XATTR_BHDR(ptr) ((struct ext2_ext_attr_header *)(ptr))
675 #define EXT2_XATTR_BFIRST(ptr) \
676 ((struct ext2_ext_attr_entry *)(EXT2_XATTR_BHDR(ptr) + 1))
677 #define EXT2_XATTR_IHDR(inode) \
678 ((struct ext2_ext_attr_header *) ((void *)(inode) + \
679 EXT2_GOOD_OLD_INODE_SIZE + (inode)->i_extra_isize))
680 #define EXT2_XATTR_IFIRST(inode) \
681 ((struct ext2_ext_attr_entry *) ((void *)EXT2_XATTR_IHDR(inode) + \
682 sizeof(EXT2_XATTR_IHDR(inode)->h_magic)))
684 static int ext2_xattr_check_names(struct ext2_ext_attr_entry *entry,
687 struct ext2_ext_attr_entry *next;
689 while (!EXT2_EXT_IS_LAST_ENTRY(entry)) {
690 next = EXT2_EXT_ATTR_NEXT(entry);
691 if ((void *)next >= end)
698 static int ext2_xattr_check_block(const char *buf, size_t size)
701 struct ext2_ext_attr_header *header = EXT2_XATTR_BHDR(buf);
703 if (header->h_magic != EXT2_EXT_ATTR_MAGIC ||
704 header->h_blocks != 1)
706 error = ext2_xattr_check_names(EXT2_XATTR_BFIRST(buf), buf + size);
710 static int ext2_xattr_check_entry(struct ext2_ext_attr_entry *entry,
713 size_t value_size = entry->e_value_size;
715 if (entry->e_value_block != 0 || value_size > size ||
716 entry->e_value_offs + value_size > size)
721 #define EXT2_ACL_VERSION 0x0001
723 /* 23.2.5 acl_tag_t values */
725 #define ACL_UNDEFINED_TAG (0x00)
726 #define ACL_USER_OBJ (0x01)
727 #define ACL_USER (0x02)
728 #define ACL_GROUP_OBJ (0x04)
729 #define ACL_GROUP (0x08)
730 #define ACL_MASK (0x10)
731 #define ACL_OTHER (0x20)
733 /* 23.2.7 ACL qualifier constants */
735 #define ACL_UNDEFINED_ID ((id_t)-1)
746 } ext2_acl_entry_short;
752 static inline int ext2_acl_count(size_t size)
755 size -= sizeof(ext2_acl_header);
756 s = size - 4 * sizeof(ext2_acl_entry_short);
758 if (size % sizeof(ext2_acl_entry_short))
760 return size / sizeof(ext2_acl_entry_short);
762 if (s % sizeof(ext2_acl_entry))
764 return s / sizeof(ext2_acl_entry) + 4;
768 #define ACL_EA_VERSION 0x0002
778 acl_ea_entry a_entries[0];
781 static inline size_t acl_ea_size(int count)
783 return sizeof(acl_ea_header) + count * sizeof(acl_ea_entry);
786 static int ext2_acl_to_xattr(void *dst, const void *src,
787 size_t dst_size, size_t src_size)
790 const void *end = src + src_size;
791 acl_ea_header *ext_acl = (acl_ea_header *)dst;
792 acl_ea_entry *dst_entry = ext_acl->a_entries;
793 ext2_acl_entry *src_entry;
795 if (src_size < sizeof(ext2_acl_header))
797 if (((ext2_acl_header *)src)->a_version !=
798 cpu_to_le32(EXT2_ACL_VERSION))
800 src += sizeof(ext2_acl_header);
801 count = ext2_acl_count(src_size);
805 BUG_ON(dst_size < acl_ea_size(count));
806 ext_acl->a_version = cpu_to_le32(ACL_EA_VERSION);
807 for (i = 0; i < count; i++, dst_entry++) {
808 src_entry = (ext2_acl_entry *)src;
809 if (src + sizeof(ext2_acl_entry_short) > end)
811 dst_entry->e_tag = src_entry->e_tag;
812 dst_entry->e_perm = src_entry->e_perm;
813 switch (le16_to_cpu(src_entry->e_tag)) {
818 src += sizeof(ext2_acl_entry_short);
819 dst_entry->e_id = cpu_to_le32(ACL_UNDEFINED_ID);
823 src += sizeof(ext2_acl_entry);
826 dst_entry->e_id = src_entry->e_id;
839 static char *xattr_prefix_table[] = {
841 [2] = "system.posix_acl_access",
842 [3] = "system.posix_acl_default",
847 static int copy_single_xattr(struct btrfs_trans_handle *trans,
848 struct btrfs_root *root, u64 objectid,
849 struct ext2_ext_attr_entry *entry,
850 const void *data, u32 datalen)
855 void *databuf = NULL;
856 char namebuf[XATTR_NAME_MAX + 1];
858 name_index = entry->e_name_index;
859 if (name_index >= ARRAY_SIZE(xattr_prefix_table) ||
860 xattr_prefix_table[name_index] == NULL)
862 name_len = strlen(xattr_prefix_table[name_index]) +
864 if (name_len >= sizeof(namebuf))
867 if (name_index == 2 || name_index == 3) {
868 size_t bufsize = acl_ea_size(ext2_acl_count(datalen));
869 databuf = malloc(bufsize);
872 ret = ext2_acl_to_xattr(databuf, data, bufsize, datalen);
878 strncpy(namebuf, xattr_prefix_table[name_index], XATTR_NAME_MAX);
879 strncat(namebuf, EXT2_EXT_ATTR_NAME(entry), entry->e_name_len);
880 if (name_len + datalen > BTRFS_LEAF_DATA_SIZE(root) -
881 sizeof(struct btrfs_item) - sizeof(struct btrfs_dir_item)) {
882 fprintf(stderr, "skip large xattr on inode %Lu name %.*s\n",
883 objectid - INO_OFFSET, name_len, namebuf);
886 ret = btrfs_insert_xattr_item(trans, root, namebuf, name_len,
887 data, datalen, objectid);
893 static int copy_extended_attrs(struct btrfs_trans_handle *trans,
894 struct btrfs_root *root, u64 objectid,
895 struct btrfs_inode_item *btrfs_inode,
896 ext2_filsys ext2_fs, ext2_ino_t ext2_ino)
902 u32 block_size = ext2_fs->blocksize;
903 u32 inode_size = EXT2_INODE_SIZE(ext2_fs->super);
904 struct ext2_inode_large *ext2_inode;
905 struct ext2_ext_attr_entry *entry;
908 char inode_buf[EXT2_GOOD_OLD_INODE_SIZE];
910 if (inode_size <= EXT2_GOOD_OLD_INODE_SIZE) {
911 ext2_inode = (struct ext2_inode_large *)inode_buf;
913 ext2_inode = (struct ext2_inode_large *)malloc(inode_size);
917 err = ext2fs_read_inode_full(ext2_fs, ext2_ino, (void *)ext2_inode,
920 fprintf(stderr, "ext2fs_read_inode_full: %s\n",
926 if (ext2_ino > ext2_fs->super->s_first_ino &&
927 inode_size > EXT2_GOOD_OLD_INODE_SIZE) {
928 if (EXT2_GOOD_OLD_INODE_SIZE +
929 ext2_inode->i_extra_isize > inode_size) {
933 if (ext2_inode->i_extra_isize != 0 &&
934 EXT2_XATTR_IHDR(ext2_inode)->h_magic ==
935 EXT2_EXT_ATTR_MAGIC) {
941 void *end = (void *)ext2_inode + inode_size;
942 entry = EXT2_XATTR_IFIRST(ext2_inode);
943 total = end - (void *)entry;
944 ret = ext2_xattr_check_names(entry, end);
947 while (!EXT2_EXT_IS_LAST_ENTRY(entry)) {
948 ret = ext2_xattr_check_entry(entry, total);
951 data = (void *)EXT2_XATTR_IFIRST(ext2_inode) +
953 datalen = entry->e_value_size;
954 ret = copy_single_xattr(trans, root, objectid,
955 entry, data, datalen);
958 entry = EXT2_EXT_ATTR_NEXT(entry);
962 if (ext2_inode->i_file_acl == 0)
965 buffer = malloc(block_size);
970 err = ext2fs_read_ext_attr(ext2_fs, ext2_inode->i_file_acl, buffer);
972 fprintf(stderr, "ext2fs_read_ext_attr: %s\n",
977 ret = ext2_xattr_check_block(buffer, block_size);
981 entry = EXT2_XATTR_BFIRST(buffer);
982 while (!EXT2_EXT_IS_LAST_ENTRY(entry)) {
983 ret = ext2_xattr_check_entry(entry, block_size);
986 data = buffer + entry->e_value_offs;
987 datalen = entry->e_value_size;
988 ret = copy_single_xattr(trans, root, objectid,
989 entry, data, datalen);
992 entry = EXT2_EXT_ATTR_NEXT(entry);
996 if ((void *)ext2_inode != inode_buf)
1000 #define MINORBITS 20
1001 #define MKDEV(ma, mi) (((ma) << MINORBITS) | (mi))
1003 static inline dev_t old_decode_dev(u16 val)
1005 return MKDEV((val >> 8) & 255, val & 255);
1008 static inline dev_t new_decode_dev(u32 dev)
1010 unsigned major = (dev & 0xfff00) >> 8;
1011 unsigned minor = (dev & 0xff) | ((dev >> 12) & 0xfff00);
1012 return MKDEV(major, minor);
1015 static int copy_inode_item(struct btrfs_inode_item *dst,
1016 struct ext2_inode *src, u32 blocksize)
1018 btrfs_set_stack_inode_generation(dst, 1);
1019 btrfs_set_stack_inode_sequence(dst, 0);
1020 btrfs_set_stack_inode_transid(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]));
1057 memset(&dst->reserved, 0, sizeof(dst->reserved));
1063 * copy a single inode. do all the required works, such as cloning
1064 * inode item, creating file extents and creating directory entries.
1066 static int copy_single_inode(struct btrfs_trans_handle *trans,
1067 struct btrfs_root *root, u64 objectid,
1068 ext2_filsys ext2_fs, ext2_ino_t ext2_ino,
1069 struct ext2_inode *ext2_inode,
1070 int datacsum, int packing, int noxattr)
1073 struct btrfs_inode_item btrfs_inode;
1075 if (ext2_inode->i_links_count == 0)
1078 copy_inode_item(&btrfs_inode, ext2_inode, ext2_fs->blocksize);
1079 if (!datacsum && S_ISREG(ext2_inode->i_mode)) {
1080 u32 flags = btrfs_stack_inode_flags(&btrfs_inode) |
1081 BTRFS_INODE_NODATASUM;
1082 btrfs_set_stack_inode_flags(&btrfs_inode, flags);
1085 switch (ext2_inode->i_mode & S_IFMT) {
1087 ret = create_file_extents(trans, root, objectid, &btrfs_inode,
1088 ext2_fs, ext2_ino, datacsum, packing);
1091 ret = create_dir_entries(trans, root, objectid, &btrfs_inode,
1095 ret = create_symbol_link(trans, root, objectid, &btrfs_inode,
1096 ext2_fs, ext2_ino, ext2_inode);
1106 ret = copy_extended_attrs(trans, root, objectid, &btrfs_inode,
1111 return btrfs_insert_inode(trans, root, objectid, &btrfs_inode);
1114 static int copy_disk_extent(struct btrfs_root *root, u64 dst_bytenr,
1115 u64 src_bytenr, u32 num_bytes)
1119 struct btrfs_fs_devices *fs_devs = root->fs_info->fs_devices;
1121 buffer = malloc(num_bytes);
1124 ret = pread(fs_devs->latest_bdev, buffer, num_bytes, src_bytenr);
1125 if (ret != num_bytes)
1127 ret = pwrite(fs_devs->latest_bdev, buffer, num_bytes, dst_bytenr);
1128 if (ret != num_bytes)
1138 * scan ext2's inode bitmap and copy all used inodes.
1140 static int copy_inodes(struct btrfs_root *root, ext2_filsys ext2_fs,
1141 int datacsum, int packing, int noxattr, struct task_ctx *p)
1145 ext2_inode_scan ext2_scan;
1146 struct ext2_inode ext2_inode;
1147 ext2_ino_t ext2_ino;
1149 struct btrfs_trans_handle *trans;
1151 trans = btrfs_start_transaction(root, 1);
1154 err = ext2fs_open_inode_scan(ext2_fs, 0, &ext2_scan);
1156 fprintf(stderr, "ext2fs_open_inode_scan: %s\n", error_message(err));
1159 while (!(err = ext2fs_get_next_inode(ext2_scan, &ext2_ino,
1161 /* no more inodes */
1164 /* skip special inode in ext2fs */
1165 if (ext2_ino < EXT2_GOOD_OLD_FIRST_INO &&
1166 ext2_ino != EXT2_ROOT_INO)
1168 objectid = ext2_ino + INO_OFFSET;
1169 ret = copy_single_inode(trans, root,
1170 objectid, ext2_fs, ext2_ino,
1171 &ext2_inode, datacsum, packing,
1173 p->cur_copy_inodes++;
1176 if (trans->blocks_used >= 4096) {
1177 ret = btrfs_commit_transaction(trans, root);
1179 trans = btrfs_start_transaction(root, 1);
1184 fprintf(stderr, "ext2fs_get_next_inode: %s\n", error_message(err));
1187 ret = btrfs_commit_transaction(trans, root);
1194 * Construct a range of ext2fs image file.
1195 * scan block allocation bitmap, find all blocks used by the ext2fs
1196 * in this range and create file extents that point to these blocks.
1198 * Note: Before calling the function, no file extent points to blocks
1201 static int create_image_file_range(struct btrfs_trans_handle *trans,
1202 struct btrfs_root *root, u64 objectid,
1203 struct btrfs_inode_item *inode,
1204 u64 start_byte, u64 end_byte,
1205 ext2_filsys ext2_fs, int datacsum)
1207 u32 blocksize = ext2_fs->blocksize;
1208 u32 block = start_byte / blocksize;
1209 u32 last_block = (end_byte + blocksize - 1) / blocksize;
1211 struct blk_iterate_data data;
1213 init_blk_iterate_data(&data, trans, root, inode, objectid, datacsum);
1214 data.first_block = block;
1216 for (; start_byte < end_byte; block++, start_byte += blocksize) {
1217 if (!ext2fs_fast_test_block_bitmap(ext2_fs->block_map, block))
1219 ret = block_iterate_proc(block, block, &data);
1223 if (data.num_blocks > 0) {
1224 ret = record_file_blocks(&data, data.first_block,
1225 data.disk_block, data.num_blocks);
1228 data.first_block += data.num_blocks;
1230 if (last_block > data.first_block) {
1231 ret = record_file_blocks(&data, data.first_block, 0,
1232 last_block - data.first_block);
1240 * Create the ext2fs image file.
1242 static int create_ext2_image(struct btrfs_root *root, ext2_filsys ext2_fs,
1243 const char *name, int datacsum)
1246 struct btrfs_key key;
1247 struct btrfs_key location;
1248 struct btrfs_path path;
1249 struct btrfs_inode_item btrfs_inode;
1250 struct btrfs_inode_item *inode_item;
1251 struct extent_buffer *leaf;
1252 struct btrfs_fs_info *fs_info = root->fs_info;
1253 struct btrfs_root *extent_root = fs_info->extent_root;
1254 struct btrfs_trans_handle *trans;
1255 struct btrfs_extent_item *ei;
1256 struct btrfs_extent_inline_ref *iref;
1257 struct btrfs_extent_data_ref *dref;
1264 u64 flags = BTRFS_INODE_READONLY;
1265 u32 sectorsize = root->sectorsize;
1267 total_bytes = btrfs_super_total_bytes(fs_info->super_copy);
1268 first_free = BTRFS_SUPER_INFO_OFFSET + sectorsize * 2 - 1;
1269 first_free &= ~((u64)sectorsize - 1);
1271 flags |= BTRFS_INODE_NODATASUM;
1273 memset(&btrfs_inode, 0, sizeof(btrfs_inode));
1274 btrfs_set_stack_inode_generation(&btrfs_inode, 1);
1275 btrfs_set_stack_inode_size(&btrfs_inode, total_bytes);
1276 btrfs_set_stack_inode_nlink(&btrfs_inode, 1);
1277 btrfs_set_stack_inode_nbytes(&btrfs_inode, 0);
1278 btrfs_set_stack_inode_mode(&btrfs_inode, S_IFREG | 0400);
1279 btrfs_set_stack_inode_flags(&btrfs_inode, flags);
1280 btrfs_init_path(&path);
1281 trans = btrfs_start_transaction(root, 1);
1284 objectid = btrfs_root_dirid(&root->root_item);
1285 ret = btrfs_find_free_objectid(trans, root, objectid, &objectid);
1290 * copy blocks covered by extent #0 to new positions. extent #0 is
1291 * special, we can't rely on relocate_extents_range to relocate it.
1293 for (last_byte = 0; last_byte < first_free; last_byte += sectorsize) {
1294 ret = custom_alloc_extent(root, sectorsize, 0, &key, 0);
1297 ret = copy_disk_extent(root, key.objectid, last_byte,
1301 ret = btrfs_record_file_extent(trans, root, objectid,
1302 &btrfs_inode, last_byte,
1303 key.objectid, sectorsize);
1307 ret = csum_disk_extent(trans, root, key.objectid,
1315 key.objectid = last_byte;
1317 btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY);
1318 ret = btrfs_search_slot(trans, fs_info->extent_root,
1323 leaf = path.nodes[0];
1324 if (path.slots[0] >= btrfs_header_nritems(leaf)) {
1325 ret = btrfs_next_leaf(extent_root, &path);
1330 leaf = path.nodes[0];
1332 btrfs_item_key_to_cpu(leaf, &key, path.slots[0]);
1333 if (last_byte > key.objectid ||
1334 key.type != BTRFS_EXTENT_ITEM_KEY) {
1339 bytenr = key.objectid;
1340 num_bytes = key.offset;
1341 ei = btrfs_item_ptr(leaf, path.slots[0],
1342 struct btrfs_extent_item);
1343 if (!(btrfs_extent_flags(leaf, ei) & BTRFS_EXTENT_FLAG_DATA)) {
1348 BUG_ON(btrfs_item_size_nr(leaf, path.slots[0]) != sizeof(*ei) +
1349 btrfs_extent_inline_ref_size(BTRFS_EXTENT_DATA_REF_KEY));
1351 iref = (struct btrfs_extent_inline_ref *)(ei + 1);
1352 key.type = btrfs_extent_inline_ref_type(leaf, iref);
1353 BUG_ON(key.type != BTRFS_EXTENT_DATA_REF_KEY);
1354 dref = (struct btrfs_extent_data_ref *)(&iref->offset);
1355 if (btrfs_extent_data_ref_root(leaf, dref) !=
1356 BTRFS_FS_TREE_OBJECTID) {
1361 if (bytenr > last_byte) {
1362 ret = create_image_file_range(trans, root, objectid,
1363 &btrfs_inode, last_byte,
1369 ret = btrfs_record_file_extent(trans, root, objectid,
1370 &btrfs_inode, bytenr, bytenr,
1374 last_byte = bytenr + num_bytes;
1375 btrfs_release_path(&path);
1377 if (trans->blocks_used >= 4096) {
1378 ret = btrfs_commit_transaction(trans, root);
1380 trans = btrfs_start_transaction(root, 1);
1384 btrfs_release_path(&path);
1385 if (total_bytes > last_byte) {
1386 ret = create_image_file_range(trans, root, objectid,
1387 &btrfs_inode, last_byte,
1388 total_bytes, ext2_fs,
1394 ret = btrfs_insert_inode(trans, root, objectid, &btrfs_inode);
1398 location.objectid = objectid;
1399 location.offset = 0;
1400 btrfs_set_key_type(&location, BTRFS_INODE_ITEM_KEY);
1401 ret = btrfs_insert_dir_item(trans, root, name, strlen(name),
1402 btrfs_root_dirid(&root->root_item),
1403 &location, BTRFS_FT_REG_FILE, objectid);
1406 ret = btrfs_insert_inode_ref(trans, root, name, strlen(name),
1408 btrfs_root_dirid(&root->root_item),
1412 location.objectid = btrfs_root_dirid(&root->root_item);
1413 location.offset = 0;
1414 btrfs_set_key_type(&location, BTRFS_INODE_ITEM_KEY);
1415 ret = btrfs_lookup_inode(trans, root, &path, &location, 1);
1418 leaf = path.nodes[0];
1419 inode_item = btrfs_item_ptr(leaf, path.slots[0],
1420 struct btrfs_inode_item);
1421 btrfs_set_inode_size(leaf, inode_item, strlen(name) * 2 +
1422 btrfs_inode_size(leaf, inode_item));
1423 btrfs_mark_buffer_dirty(leaf);
1424 btrfs_release_path(&path);
1425 ret = btrfs_commit_transaction(trans, root);
1428 btrfs_release_path(&path);
1432 static struct btrfs_root * link_subvol(struct btrfs_root *root,
1433 const char *base, u64 root_objectid)
1435 struct btrfs_trans_handle *trans;
1436 struct btrfs_fs_info *fs_info = root->fs_info;
1437 struct btrfs_root *tree_root = fs_info->tree_root;
1438 struct btrfs_root *new_root = NULL;
1439 struct btrfs_path *path;
1440 struct btrfs_inode_item *inode_item;
1441 struct extent_buffer *leaf;
1442 struct btrfs_key key;
1443 u64 dirid = btrfs_root_dirid(&root->root_item);
1445 char buf[BTRFS_NAME_LEN + 1]; /* for snprintf null */
1451 if (len < 1 || len > BTRFS_NAME_LEN)
1454 path = btrfs_alloc_path();
1457 key.objectid = dirid;
1458 key.type = BTRFS_DIR_INDEX_KEY;
1459 key.offset = (u64)-1;
1461 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1464 if (path->slots[0] > 0) {
1466 btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
1467 if (key.objectid == dirid && key.type == BTRFS_DIR_INDEX_KEY)
1468 index = key.offset + 1;
1470 btrfs_release_path(path);
1472 trans = btrfs_start_transaction(root, 1);
1475 key.objectid = dirid;
1477 key.type = BTRFS_INODE_ITEM_KEY;
1479 ret = btrfs_lookup_inode(trans, root, path, &key, 1);
1481 leaf = path->nodes[0];
1482 inode_item = btrfs_item_ptr(leaf, path->slots[0],
1483 struct btrfs_inode_item);
1485 key.objectid = root_objectid;
1486 key.offset = (u64)-1;
1487 key.type = BTRFS_ROOT_ITEM_KEY;
1489 memcpy(buf, base, len);
1490 for (i = 0; i < 1024; i++) {
1491 ret = btrfs_insert_dir_item(trans, root, buf, len,
1492 dirid, &key, BTRFS_FT_DIR, index);
1495 len = snprintf(buf, ARRAY_SIZE(buf), "%s%d", base, i);
1496 if (len < 1 || len > BTRFS_NAME_LEN) {
1504 btrfs_set_inode_size(leaf, inode_item, len * 2 +
1505 btrfs_inode_size(leaf, inode_item));
1506 btrfs_mark_buffer_dirty(leaf);
1507 btrfs_release_path(path);
1509 /* add the backref first */
1510 ret = btrfs_add_root_ref(trans, tree_root, root_objectid,
1511 BTRFS_ROOT_BACKREF_KEY,
1512 root->root_key.objectid,
1513 dirid, index, buf, len);
1516 /* now add the forward ref */
1517 ret = btrfs_add_root_ref(trans, tree_root, root->root_key.objectid,
1518 BTRFS_ROOT_REF_KEY, root_objectid,
1519 dirid, index, buf, len);
1521 ret = btrfs_commit_transaction(trans, root);
1524 new_root = btrfs_read_fs_root(fs_info, &key);
1525 if (IS_ERR(new_root))
1528 btrfs_free_path(path);
1532 static int create_chunk_mapping(struct btrfs_trans_handle *trans,
1533 struct btrfs_root *root)
1535 struct btrfs_fs_info *info = root->fs_info;
1536 struct btrfs_root *chunk_root = info->chunk_root;
1537 struct btrfs_root *extent_root = info->extent_root;
1538 struct btrfs_device *device;
1539 struct btrfs_block_group_cache *cache;
1540 struct btrfs_dev_extent *extent;
1541 struct extent_buffer *leaf;
1542 struct btrfs_chunk chunk;
1543 struct btrfs_key key;
1544 struct btrfs_path path;
1550 btrfs_init_path(&path);
1552 total_bytes = btrfs_super_total_bytes(root->fs_info->super_copy);
1553 chunk_objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID;
1555 BUG_ON(list_empty(&info->fs_devices->devices));
1556 device = list_entry(info->fs_devices->devices.next,
1557 struct btrfs_device, dev_list);
1558 BUG_ON(device->devid != info->fs_devices->latest_devid);
1560 /* delete device extent created by make_btrfs */
1561 key.objectid = device->devid;
1563 key.type = BTRFS_DEV_EXTENT_KEY;
1564 ret = btrfs_search_slot(trans, device->dev_root, &key, &path, -1, 1);
1569 ret = btrfs_del_item(trans, device->dev_root, &path);
1572 btrfs_release_path(&path);
1574 /* delete chunk item created by make_btrfs */
1575 key.objectid = chunk_objectid;
1577 key.type = BTRFS_CHUNK_ITEM_KEY;
1578 ret = btrfs_search_slot(trans, chunk_root, &key, &path, -1, 1);
1583 ret = btrfs_del_item(trans, chunk_root, &path);
1586 btrfs_release_path(&path);
1588 /* for each block group, create device extent and chunk item */
1590 while (cur_start < total_bytes) {
1591 cache = btrfs_lookup_block_group(root->fs_info, cur_start);
1594 /* insert device extent */
1595 key.objectid = device->devid;
1596 key.offset = cache->key.objectid;
1597 key.type = BTRFS_DEV_EXTENT_KEY;
1598 ret = btrfs_insert_empty_item(trans, device->dev_root, &path,
1599 &key, sizeof(*extent));
1603 leaf = path.nodes[0];
1604 extent = btrfs_item_ptr(leaf, path.slots[0],
1605 struct btrfs_dev_extent);
1607 btrfs_set_dev_extent_chunk_tree(leaf, extent,
1608 chunk_root->root_key.objectid);
1609 btrfs_set_dev_extent_chunk_objectid(leaf, extent,
1611 btrfs_set_dev_extent_chunk_offset(leaf, extent,
1612 cache->key.objectid);
1613 btrfs_set_dev_extent_length(leaf, extent, cache->key.offset);
1614 write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid,
1615 (unsigned long)btrfs_dev_extent_chunk_tree_uuid(extent),
1617 btrfs_mark_buffer_dirty(leaf);
1618 btrfs_release_path(&path);
1620 /* insert chunk item */
1621 btrfs_set_stack_chunk_length(&chunk, cache->key.offset);
1622 btrfs_set_stack_chunk_owner(&chunk,
1623 extent_root->root_key.objectid);
1624 btrfs_set_stack_chunk_stripe_len(&chunk, BTRFS_STRIPE_LEN);
1625 btrfs_set_stack_chunk_type(&chunk, cache->flags);
1626 btrfs_set_stack_chunk_io_align(&chunk, device->io_align);
1627 btrfs_set_stack_chunk_io_width(&chunk, device->io_width);
1628 btrfs_set_stack_chunk_sector_size(&chunk, device->sector_size);
1629 btrfs_set_stack_chunk_num_stripes(&chunk, 1);
1630 btrfs_set_stack_chunk_sub_stripes(&chunk, 0);
1631 btrfs_set_stack_stripe_devid(&chunk.stripe, device->devid);
1632 btrfs_set_stack_stripe_offset(&chunk.stripe,
1633 cache->key.objectid);
1634 memcpy(&chunk.stripe.dev_uuid, device->uuid, BTRFS_UUID_SIZE);
1636 key.objectid = chunk_objectid;
1637 key.offset = cache->key.objectid;
1638 key.type = BTRFS_CHUNK_ITEM_KEY;
1640 ret = btrfs_insert_item(trans, chunk_root, &key, &chunk,
1641 btrfs_chunk_item_size(1));
1645 cur_start = cache->key.objectid + cache->key.offset;
1648 device->bytes_used = total_bytes;
1649 ret = btrfs_update_device(trans, device);
1651 btrfs_release_path(&path);
1655 static int create_subvol(struct btrfs_trans_handle *trans,
1656 struct btrfs_root *root, u64 root_objectid)
1658 struct extent_buffer *tmp;
1659 struct btrfs_root *new_root;
1660 struct btrfs_key key;
1661 struct btrfs_root_item root_item;
1664 ret = btrfs_copy_root(trans, root, root->node, &tmp,
1668 memcpy(&root_item, &root->root_item, sizeof(root_item));
1669 btrfs_set_root_bytenr(&root_item, tmp->start);
1670 btrfs_set_root_level(&root_item, btrfs_header_level(tmp));
1671 btrfs_set_root_generation(&root_item, trans->transid);
1672 free_extent_buffer(tmp);
1674 key.objectid = root_objectid;
1675 key.type = BTRFS_ROOT_ITEM_KEY;
1676 key.offset = trans->transid;
1677 ret = btrfs_insert_root(trans, root->fs_info->tree_root,
1680 key.offset = (u64)-1;
1681 new_root = btrfs_read_fs_root(root->fs_info, &key);
1682 BUG_ON(!new_root || IS_ERR(new_root));
1684 ret = btrfs_make_root_dir(trans, new_root, BTRFS_FIRST_FREE_OBJECTID);
1690 static int init_btrfs(struct btrfs_root *root)
1693 struct btrfs_key location;
1694 struct btrfs_trans_handle *trans;
1695 struct btrfs_fs_info *fs_info = root->fs_info;
1696 struct extent_buffer *tmp;
1698 trans = btrfs_start_transaction(root, 1);
1700 ret = btrfs_make_block_groups(trans, root);
1703 ret = btrfs_fix_block_accounting(trans, root);
1706 ret = create_chunk_mapping(trans, root);
1709 ret = btrfs_make_root_dir(trans, fs_info->tree_root,
1710 BTRFS_ROOT_TREE_DIR_OBJECTID);
1713 memcpy(&location, &root->root_key, sizeof(location));
1714 location.offset = (u64)-1;
1715 ret = btrfs_insert_dir_item(trans, fs_info->tree_root, "default", 7,
1716 btrfs_super_root_dir(fs_info->super_copy),
1717 &location, BTRFS_FT_DIR, 0);
1720 ret = btrfs_insert_inode_ref(trans, fs_info->tree_root, "default", 7,
1722 btrfs_super_root_dir(fs_info->super_copy), 0);
1725 btrfs_set_root_dirid(&fs_info->fs_root->root_item,
1726 BTRFS_FIRST_FREE_OBJECTID);
1728 /* subvol for ext2 image file */
1729 ret = create_subvol(trans, root, CONV_IMAGE_SUBVOL_OBJECTID);
1731 /* subvol for data relocation */
1732 ret = create_subvol(trans, root, BTRFS_DATA_RELOC_TREE_OBJECTID);
1735 extent_buffer_get(fs_info->csum_root->node);
1736 ret = __btrfs_cow_block(trans, fs_info->csum_root,
1737 fs_info->csum_root->node, NULL, 0, &tmp, 0, 0);
1739 free_extent_buffer(tmp);
1741 ret = btrfs_commit_transaction(trans, root);
1748 * Migrate super block to its default position and zero 0 ~ 16k
1750 static int migrate_super_block(int fd, u64 old_bytenr, u32 sectorsize)
1753 struct extent_buffer *buf;
1754 struct btrfs_super_block *super;
1758 BUG_ON(sectorsize < sizeof(*super));
1759 buf = malloc(sizeof(*buf) + sectorsize);
1763 buf->len = sectorsize;
1764 ret = pread(fd, buf->data, sectorsize, old_bytenr);
1765 if (ret != sectorsize)
1768 super = (struct btrfs_super_block *)buf->data;
1769 BUG_ON(btrfs_super_bytenr(super) != old_bytenr);
1770 btrfs_set_super_bytenr(super, BTRFS_SUPER_INFO_OFFSET);
1772 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
1773 ret = pwrite(fd, buf->data, sectorsize, BTRFS_SUPER_INFO_OFFSET);
1774 if (ret != sectorsize)
1781 memset(buf->data, 0, sectorsize);
1782 for (bytenr = 0; bytenr < BTRFS_SUPER_INFO_OFFSET; ) {
1783 len = BTRFS_SUPER_INFO_OFFSET - bytenr;
1784 if (len > sectorsize)
1786 ret = pwrite(fd, buf->data, len, bytenr);
1788 fprintf(stderr, "unable to zero fill device\n");
1802 static int prepare_system_chunk_sb(struct btrfs_super_block *super)
1804 struct btrfs_chunk *chunk;
1805 struct btrfs_disk_key *key;
1806 u32 sectorsize = btrfs_super_sectorsize(super);
1808 key = (struct btrfs_disk_key *)(super->sys_chunk_array);
1809 chunk = (struct btrfs_chunk *)(super->sys_chunk_array +
1810 sizeof(struct btrfs_disk_key));
1812 btrfs_set_disk_key_objectid(key, BTRFS_FIRST_CHUNK_TREE_OBJECTID);
1813 btrfs_set_disk_key_type(key, BTRFS_CHUNK_ITEM_KEY);
1814 btrfs_set_disk_key_offset(key, 0);
1816 btrfs_set_stack_chunk_length(chunk, btrfs_super_total_bytes(super));
1817 btrfs_set_stack_chunk_owner(chunk, BTRFS_EXTENT_TREE_OBJECTID);
1818 btrfs_set_stack_chunk_stripe_len(chunk, BTRFS_STRIPE_LEN);
1819 btrfs_set_stack_chunk_type(chunk, BTRFS_BLOCK_GROUP_SYSTEM);
1820 btrfs_set_stack_chunk_io_align(chunk, sectorsize);
1821 btrfs_set_stack_chunk_io_width(chunk, sectorsize);
1822 btrfs_set_stack_chunk_sector_size(chunk, sectorsize);
1823 btrfs_set_stack_chunk_num_stripes(chunk, 1);
1824 btrfs_set_stack_chunk_sub_stripes(chunk, 0);
1825 chunk->stripe.devid = super->dev_item.devid;
1826 btrfs_set_stack_stripe_offset(&chunk->stripe, 0);
1827 memcpy(chunk->stripe.dev_uuid, super->dev_item.uuid, BTRFS_UUID_SIZE);
1828 btrfs_set_super_sys_array_size(super, sizeof(*key) + sizeof(*chunk));
1832 static int prepare_system_chunk(int fd, u64 sb_bytenr)
1835 struct extent_buffer *buf;
1836 struct btrfs_super_block *super;
1838 BUG_ON(BTRFS_SUPER_INFO_SIZE < sizeof(*super));
1839 buf = malloc(sizeof(*buf) + BTRFS_SUPER_INFO_SIZE);
1843 buf->len = BTRFS_SUPER_INFO_SIZE;
1844 ret = pread(fd, buf->data, BTRFS_SUPER_INFO_SIZE, sb_bytenr);
1845 if (ret != BTRFS_SUPER_INFO_SIZE)
1848 super = (struct btrfs_super_block *)buf->data;
1849 BUG_ON(btrfs_super_bytenr(super) != sb_bytenr);
1850 BUG_ON(btrfs_super_num_devices(super) != 1);
1852 ret = prepare_system_chunk_sb(super);
1856 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
1857 ret = pwrite(fd, buf->data, BTRFS_SUPER_INFO_SIZE, sb_bytenr);
1858 if (ret != BTRFS_SUPER_INFO_SIZE)
1869 static int relocate_one_reference(struct btrfs_trans_handle *trans,
1870 struct btrfs_root *root,
1871 u64 extent_start, u64 extent_size,
1872 struct btrfs_key *extent_key,
1873 struct extent_io_tree *reloc_tree)
1875 struct extent_buffer *leaf;
1876 struct btrfs_file_extent_item *fi;
1877 struct btrfs_key key;
1878 struct btrfs_path path;
1879 struct btrfs_inode_item inode;
1880 struct blk_iterate_data data;
1887 u32 sectorsize = root->sectorsize;
1893 btrfs_init_path(&path);
1894 ret = btrfs_search_slot(trans, root, extent_key, &path, -1, 1);
1898 leaf = path.nodes[0];
1899 fi = btrfs_item_ptr(leaf, path.slots[0],
1900 struct btrfs_file_extent_item);
1901 BUG_ON(btrfs_file_extent_offset(leaf, fi) > 0);
1902 if (extent_start != btrfs_file_extent_disk_bytenr(leaf, fi) ||
1903 extent_size != btrfs_file_extent_disk_num_bytes(leaf, fi)) {
1908 bytenr = extent_start + btrfs_file_extent_offset(leaf, fi);
1909 num_bytes = btrfs_file_extent_num_bytes(leaf, fi);
1911 ret = btrfs_del_item(trans, root, &path);
1915 ret = btrfs_free_extent(trans, root, extent_start, extent_size, 0,
1916 root->root_key.objectid,
1917 extent_key->objectid, extent_key->offset);
1921 btrfs_release_path(&path);
1923 key.objectid = extent_key->objectid;
1925 key.type = BTRFS_INODE_ITEM_KEY;
1926 ret = btrfs_lookup_inode(trans, root, &path, &key, 0);
1930 leaf = path.nodes[0];
1931 ptr = btrfs_item_ptr_offset(leaf, path.slots[0]);
1932 read_extent_buffer(leaf, &inode, ptr, sizeof(inode));
1933 btrfs_release_path(&path);
1935 BUG_ON(num_bytes & (sectorsize - 1));
1936 nbytes = btrfs_stack_inode_nbytes(&inode) - num_bytes;
1937 btrfs_set_stack_inode_nbytes(&inode, nbytes);
1938 datacsum = !(btrfs_stack_inode_flags(&inode) & BTRFS_INODE_NODATASUM);
1940 init_blk_iterate_data(&data, trans, root, &inode, extent_key->objectid,
1942 data.first_block = extent_key->offset;
1944 cur_offset = extent_key->offset;
1945 while (num_bytes > 0) {
1946 sector_end = bytenr + sectorsize - 1;
1947 if (test_range_bit(reloc_tree, bytenr, sector_end,
1948 EXTENT_LOCKED, 1)) {
1949 ret = get_state_private(reloc_tree, bytenr, &new_pos);
1952 ret = custom_alloc_extent(root, sectorsize, 0, &key, 0);
1955 new_pos = key.objectid;
1957 if (cur_offset == extent_key->offset) {
1958 fd = root->fs_info->fs_devices->latest_bdev;
1959 readahead(fd, bytenr, num_bytes);
1961 ret = copy_disk_extent(root, new_pos, bytenr,
1965 ret = set_extent_bits(reloc_tree, bytenr, sector_end,
1966 EXTENT_LOCKED, GFP_NOFS);
1968 ret = set_state_private(reloc_tree, bytenr, new_pos);
1972 ret = block_iterate_proc(new_pos / sectorsize,
1973 cur_offset / sectorsize, &data);
1977 cur_offset += sectorsize;
1978 bytenr += sectorsize;
1979 num_bytes -= sectorsize;
1982 if (data.num_blocks > 0) {
1983 ret = record_file_blocks(&data, data.first_block,
1984 data.disk_block, data.num_blocks);
1989 key.objectid = extent_key->objectid;
1991 key.type = BTRFS_INODE_ITEM_KEY;
1992 ret = btrfs_lookup_inode(trans, root, &path, &key, 1);
1996 leaf = path.nodes[0];
1997 ptr = btrfs_item_ptr_offset(leaf, path.slots[0]);
1998 write_extent_buffer(leaf, &inode, ptr, sizeof(inode));
1999 btrfs_mark_buffer_dirty(leaf);
2000 btrfs_release_path(&path);
2003 btrfs_release_path(&path);
2007 static int relocate_extents_range(struct btrfs_root *fs_root,
2008 struct btrfs_root *image_root,
2009 u64 start_byte, u64 end_byte)
2011 struct btrfs_fs_info *info = fs_root->fs_info;
2012 struct btrfs_root *extent_root = info->extent_root;
2013 struct btrfs_root *cur_root = NULL;
2014 struct btrfs_trans_handle *trans;
2015 struct btrfs_extent_data_ref *dref;
2016 struct btrfs_extent_inline_ref *iref;
2017 struct btrfs_extent_item *ei;
2018 struct extent_buffer *leaf;
2019 struct btrfs_key key;
2020 struct btrfs_key extent_key;
2021 struct btrfs_path path;
2022 struct extent_io_tree reloc_tree;
2032 btrfs_init_path(&path);
2033 extent_io_tree_init(&reloc_tree);
2035 key.objectid = start_byte;
2037 key.type = BTRFS_EXTENT_ITEM_KEY;
2038 ret = btrfs_search_slot(NULL, extent_root, &key, &path, 0, 0);
2042 ret = btrfs_previous_item(extent_root, &path, 0,
2043 BTRFS_EXTENT_ITEM_KEY);
2047 leaf = path.nodes[0];
2048 btrfs_item_key_to_cpu(leaf, &key, path.slots[0]);
2049 if (key.objectid + key.offset > start_byte)
2050 start_byte = key.objectid;
2053 btrfs_release_path(&path);
2055 cur_root = (pass % 2 == 0) ? image_root : fs_root;
2058 trans = btrfs_start_transaction(cur_root, 1);
2061 cur_byte = start_byte;
2063 key.objectid = cur_byte;
2065 key.type = BTRFS_EXTENT_ITEM_KEY;
2066 ret = btrfs_search_slot(trans, extent_root,
2071 leaf = path.nodes[0];
2072 if (path.slots[0] >= btrfs_header_nritems(leaf)) {
2073 ret = btrfs_next_leaf(extent_root, &path);
2078 leaf = path.nodes[0];
2081 btrfs_item_key_to_cpu(leaf, &key, path.slots[0]);
2082 if (key.objectid < cur_byte ||
2083 key.type != BTRFS_EXTENT_ITEM_KEY) {
2087 if (key.objectid >= end_byte)
2092 cur_byte = key.objectid;
2093 num_bytes = key.offset;
2094 ei = btrfs_item_ptr(leaf, path.slots[0],
2095 struct btrfs_extent_item);
2096 BUG_ON(!(btrfs_extent_flags(leaf, ei) &
2097 BTRFS_EXTENT_FLAG_DATA));
2099 ptr = btrfs_item_ptr_offset(leaf, path.slots[0]);
2100 end = ptr + btrfs_item_size_nr(leaf, path.slots[0]);
2102 ptr += sizeof(struct btrfs_extent_item);
2105 iref = (struct btrfs_extent_inline_ref *)ptr;
2106 key.type = btrfs_extent_inline_ref_type(leaf, iref);
2107 BUG_ON(key.type != BTRFS_EXTENT_DATA_REF_KEY);
2108 dref = (struct btrfs_extent_data_ref *)(&iref->offset);
2109 ref_root = btrfs_extent_data_ref_root(leaf, dref);
2110 extent_key.objectid =
2111 btrfs_extent_data_ref_objectid(leaf, dref);
2113 btrfs_extent_data_ref_offset(leaf, dref);
2114 extent_key.type = BTRFS_EXTENT_DATA_KEY;
2115 BUG_ON(btrfs_extent_data_ref_count(leaf, dref) != 1);
2117 if (ref_root == cur_root->root_key.objectid)
2120 ptr += btrfs_extent_inline_ref_size(key.type);
2128 ret = relocate_one_reference(trans, cur_root, cur_byte,
2129 num_bytes, &extent_key,
2134 cur_byte += num_bytes;
2135 btrfs_release_path(&path);
2137 if (trans->blocks_used >= 4096) {
2138 ret = btrfs_commit_transaction(trans, cur_root);
2140 trans = btrfs_start_transaction(cur_root, 1);
2144 btrfs_release_path(&path);
2146 ret = btrfs_commit_transaction(trans, cur_root);
2149 if (num_extents > 0 && pass++ < 16)
2152 ret = (num_extents > 0) ? -1 : 0;
2154 btrfs_release_path(&path);
2155 extent_io_tree_cleanup(&reloc_tree);
2160 * relocate data in system chunk
2162 static int cleanup_sys_chunk(struct btrfs_root *fs_root,
2163 struct btrfs_root *image_root)
2165 struct btrfs_block_group_cache *cache;
2171 cache = btrfs_lookup_block_group(fs_root->fs_info, offset);
2175 end_byte = cache->key.objectid + cache->key.offset;
2176 if (cache->flags & BTRFS_BLOCK_GROUP_SYSTEM) {
2177 ret = relocate_extents_range(fs_root, image_root,
2178 cache->key.objectid,
2185 for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
2186 offset = btrfs_sb_offset(i);
2187 offset &= ~((u64)BTRFS_STRIPE_LEN - 1);
2189 ret = relocate_extents_range(fs_root, image_root,
2190 offset, offset + BTRFS_STRIPE_LEN);
2199 static int fixup_chunk_mapping(struct btrfs_root *root)
2201 struct btrfs_trans_handle *trans;
2202 struct btrfs_fs_info *info = root->fs_info;
2203 struct btrfs_root *chunk_root = info->chunk_root;
2204 struct extent_buffer *leaf;
2205 struct btrfs_key key;
2206 struct btrfs_path path;
2207 struct btrfs_chunk chunk;
2213 btrfs_init_path(&path);
2215 trans = btrfs_start_transaction(root, 1);
2219 * recow the whole chunk tree. this will move all chunk tree blocks
2220 * into system block group.
2222 memset(&key, 0, sizeof(key));
2224 ret = btrfs_search_slot(trans, chunk_root, &key, &path, 0, 1);
2228 ret = btrfs_next_leaf(chunk_root, &path);
2234 btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]);
2235 btrfs_release_path(&path);
2237 btrfs_release_path(&path);
2239 /* fixup the system chunk array in super block */
2240 btrfs_set_super_sys_array_size(info->super_copy, 0);
2242 key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID;
2244 key.type = BTRFS_CHUNK_ITEM_KEY;
2246 ret = btrfs_search_slot(trans, chunk_root, &key, &path, 0, 0);
2251 leaf = path.nodes[0];
2252 if (path.slots[0] >= btrfs_header_nritems(leaf)) {
2253 ret = btrfs_next_leaf(chunk_root, &path);
2258 leaf = path.nodes[0];
2260 btrfs_item_key_to_cpu(leaf, &key, path.slots[0]);
2261 if (key.type != BTRFS_CHUNK_ITEM_KEY)
2264 ptr = btrfs_item_ptr_offset(leaf, path.slots[0]);
2265 size = btrfs_item_size_nr(leaf, path.slots[0]);
2266 BUG_ON(size != sizeof(chunk));
2267 read_extent_buffer(leaf, &chunk, ptr, size);
2268 type = btrfs_stack_chunk_type(&chunk);
2270 if (!(type & BTRFS_BLOCK_GROUP_SYSTEM))
2273 ret = btrfs_add_system_chunk(trans, chunk_root, &key,
2281 ret = btrfs_commit_transaction(trans, root);
2284 btrfs_release_path(&path);
2288 static int do_convert(const char *devname, int datacsum, int packing, int noxattr,
2289 u32 nodesize, int copylabel, const char *fslabel, int progress,
2292 int i, ret, blocks_per_node;
2298 ext2_filsys ext2_fs;
2299 struct btrfs_root *root;
2300 struct btrfs_root *image_root;
2301 struct task_ctx ctx;
2302 char features_buf[64];
2303 struct btrfs_mkfs_config mkfs_cfg;
2305 ret = open_ext2fs(devname, &ext2_fs);
2307 fprintf(stderr, "unable to open the Ext2fs\n");
2310 blocksize = ext2_fs->blocksize;
2311 total_bytes = (u64)ext2_fs->super->s_blocks_count * blocksize;
2312 if (blocksize < 4096) {
2313 fprintf(stderr, "block size is too small\n");
2316 if (!(ext2_fs->super->s_feature_incompat &
2317 EXT2_FEATURE_INCOMPAT_FILETYPE)) {
2318 fprintf(stderr, "filetype feature is missing\n");
2321 if (btrfs_check_nodesize(nodesize, blocksize))
2323 blocks_per_node = nodesize / blocksize;
2324 ret = -blocks_per_node;
2325 for (i = 0; i < 7; i++) {
2326 if (nodesize == blocksize)
2327 ret = ext2_alloc_block(ext2_fs, 0, blocks + i);
2329 ret = ext2_alloc_block_range(ext2_fs,
2330 ret + blocks_per_node, blocks_per_node,
2333 fprintf(stderr, "not enough free space\n");
2336 blocks[i] *= blocksize;
2338 super_bytenr = blocks[0];
2339 fd = open(devname, O_RDWR);
2341 fprintf(stderr, "unable to open %s\n", devname);
2344 btrfs_parse_features_to_string(features_buf, features);
2345 if (features == BTRFS_MKFS_DEFAULT_FEATURES)
2346 strcat(features_buf, " (default)");
2348 printf("create btrfs filesystem:\n");
2349 printf("\tblocksize: %u\n", blocksize);
2350 printf("\tnodesize: %u\n", nodesize);
2351 printf("\tfeatures: %s\n", features_buf);
2353 mkfs_cfg.label = ext2_fs->super->s_volume_name;
2354 mkfs_cfg.fs_uuid = NULL;
2355 memcpy(mkfs_cfg.blocks, blocks, sizeof(blocks));
2356 mkfs_cfg.num_bytes = total_bytes;
2357 mkfs_cfg.nodesize = nodesize;
2358 mkfs_cfg.sectorsize = blocksize;
2359 mkfs_cfg.stripesize = blocksize;
2360 mkfs_cfg.features = features;
2362 ret = make_btrfs(fd, &mkfs_cfg);
2364 fprintf(stderr, "unable to create initial ctree: %s\n",
2368 /* create a system chunk that maps the whole device */
2369 ret = prepare_system_chunk(fd, super_bytenr);
2371 fprintf(stderr, "unable to update system chunk\n");
2374 root = open_ctree_fd(fd, devname, super_bytenr, OPEN_CTREE_WRITES);
2376 fprintf(stderr, "unable to open ctree\n");
2379 ret = cache_free_extents(root, ext2_fs);
2381 fprintf(stderr, "error during cache_free_extents %d\n", ret);
2384 root->fs_info->extent_ops = &extent_ops;
2385 /* recover block allocation bitmap */
2386 for (i = 0; i < 7; i++) {
2387 blocks[i] /= blocksize;
2388 if (nodesize == blocksize)
2389 ext2_free_block(ext2_fs, blocks[i]);
2391 ext2_free_block_range(ext2_fs, blocks[i],
2394 ret = init_btrfs(root);
2396 fprintf(stderr, "unable to setup the root tree\n");
2399 printf("creating btrfs metadata.\n");
2400 ctx.max_copy_inodes = (ext2_fs->super->s_inodes_count
2401 - ext2_fs->super->s_free_inodes_count);
2402 ctx.cur_copy_inodes = 0;
2405 ctx.info = task_init(print_copied_inodes, after_copied_inodes, &ctx);
2406 task_start(ctx.info);
2408 ret = copy_inodes(root, ext2_fs, datacsum, packing, noxattr, &ctx);
2410 fprintf(stderr, "error during copy_inodes %d\n", ret);
2414 task_stop(ctx.info);
2415 task_deinit(ctx.info);
2417 printf("creating ext2fs image file.\n");
2418 image_root = link_subvol(root, "ext2_saved", CONV_IMAGE_SUBVOL_OBJECTID);
2420 fprintf(stderr, "unable to create subvol\n");
2423 ret = create_ext2_image(image_root, ext2_fs, "image", datacsum);
2425 fprintf(stderr, "error during create_ext2_image %d\n", ret);
2428 memset(root->fs_info->super_copy->label, 0, BTRFS_LABEL_SIZE);
2429 if (copylabel == 1) {
2430 strncpy(root->fs_info->super_copy->label,
2431 ext2_fs->super->s_volume_name, 16);
2432 fprintf(stderr, "copy label '%s'\n",
2433 root->fs_info->super_copy->label);
2434 } else if (copylabel == -1) {
2435 strcpy(root->fs_info->super_copy->label, fslabel);
2436 fprintf(stderr, "set label to '%s'\n", fslabel);
2439 printf("cleaning up system chunk.\n");
2440 ret = cleanup_sys_chunk(root, image_root);
2442 fprintf(stderr, "error during cleanup_sys_chunk %d\n", ret);
2445 ret = close_ctree(root);
2447 fprintf(stderr, "error during close_ctree %d\n", ret);
2450 close_ext2fs(ext2_fs);
2453 * If this step succeed, we get a mountable btrfs. Otherwise
2454 * the ext2fs is left unchanged.
2456 ret = migrate_super_block(fd, super_bytenr, blocksize);
2458 fprintf(stderr, "unable to migrate super block\n");
2462 root = open_ctree_fd(fd, devname, 0, OPEN_CTREE_WRITES);
2464 fprintf(stderr, "unable to open ctree\n");
2467 /* move chunk tree into system chunk. */
2468 ret = fixup_chunk_mapping(root);
2470 fprintf(stderr, "error during fixup_chunk_tree\n");
2473 ret = close_ctree(root);
2476 printf("conversion complete.\n");
2481 fprintf(stderr, "conversion aborted.\n");
2485 static int may_rollback(struct btrfs_root *root)
2487 struct btrfs_fs_info *info = root->fs_info;
2488 struct btrfs_multi_bio *multi = NULL;
2496 if (btrfs_super_num_devices(info->super_copy) != 1)
2499 bytenr = BTRFS_SUPER_INFO_OFFSET;
2500 total_bytes = btrfs_super_total_bytes(root->fs_info->super_copy);
2503 ret = btrfs_map_block(&info->mapping_tree, WRITE, bytenr,
2504 &length, &multi, 0, NULL);
2506 if (ret == -ENOENT) {
2507 /* removed block group at the tail */
2508 if (length == (u64)-1)
2511 /* removed block group in the middle */
2517 num_stripes = multi->num_stripes;
2518 physical = multi->stripes[0].physical;
2521 if (num_stripes != 1 || physical != bytenr)
2525 if (bytenr >= total_bytes)
2533 static int do_rollback(const char *devname)
2538 struct btrfs_root *root;
2539 struct btrfs_root *image_root;
2540 struct btrfs_root *chunk_root;
2541 struct btrfs_dir_item *dir;
2542 struct btrfs_inode_item *inode;
2543 struct btrfs_file_extent_item *fi;
2544 struct btrfs_trans_handle *trans;
2545 struct extent_buffer *leaf;
2546 struct btrfs_block_group_cache *cache1;
2547 struct btrfs_block_group_cache *cache2;
2548 struct btrfs_key key;
2549 struct btrfs_path path;
2550 struct extent_io_tree io_tree;
2565 extent_io_tree_init(&io_tree);
2567 fd = open(devname, O_RDWR);
2569 fprintf(stderr, "unable to open %s\n", devname);
2572 root = open_ctree_fd(fd, devname, 0, OPEN_CTREE_WRITES);
2574 fprintf(stderr, "unable to open ctree\n");
2577 ret = may_rollback(root);
2579 fprintf(stderr, "unable to do rollback\n");
2583 sectorsize = root->sectorsize;
2584 buf = malloc(sectorsize);
2586 fprintf(stderr, "unable to allocate memory\n");
2590 btrfs_init_path(&path);
2592 key.objectid = CONV_IMAGE_SUBVOL_OBJECTID;
2593 key.type = BTRFS_ROOT_ITEM_KEY;
2594 key.offset = (u64)-1;
2595 image_root = btrfs_read_fs_root(root->fs_info, &key);
2596 if (!image_root || IS_ERR(image_root)) {
2597 fprintf(stderr, "unable to open subvol %llu\n",
2598 (unsigned long long)key.objectid);
2603 root_dir = btrfs_root_dirid(&root->root_item);
2604 dir = btrfs_lookup_dir_item(NULL, image_root, &path,
2605 root_dir, name, strlen(name), 0);
2606 if (!dir || IS_ERR(dir)) {
2607 fprintf(stderr, "unable to find file %s\n", name);
2610 leaf = path.nodes[0];
2611 btrfs_dir_item_key_to_cpu(leaf, dir, &key);
2612 btrfs_release_path(&path);
2614 objectid = key.objectid;
2616 ret = btrfs_lookup_inode(NULL, image_root, &path, &key, 0);
2618 fprintf(stderr, "unable to find inode item\n");
2621 leaf = path.nodes[0];
2622 inode = btrfs_item_ptr(leaf, path.slots[0], struct btrfs_inode_item);
2623 total_bytes = btrfs_inode_size(leaf, inode);
2624 btrfs_release_path(&path);
2626 key.objectid = objectid;
2628 btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY);
2629 ret = btrfs_search_slot(NULL, image_root, &key, &path, 0, 0);
2631 fprintf(stderr, "unable to find first file extent\n");
2632 btrfs_release_path(&path);
2636 /* build mapping tree for the relocated blocks */
2637 for (offset = 0; offset < total_bytes; ) {
2638 leaf = path.nodes[0];
2639 if (path.slots[0] >= btrfs_header_nritems(leaf)) {
2640 ret = btrfs_next_leaf(root, &path);
2646 btrfs_item_key_to_cpu(leaf, &key, path.slots[0]);
2647 if (key.objectid != objectid || key.offset != offset ||
2648 btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY)
2651 fi = btrfs_item_ptr(leaf, path.slots[0],
2652 struct btrfs_file_extent_item);
2653 if (btrfs_file_extent_type(leaf, fi) != BTRFS_FILE_EXTENT_REG)
2655 if (btrfs_file_extent_compression(leaf, fi) ||
2656 btrfs_file_extent_encryption(leaf, fi) ||
2657 btrfs_file_extent_other_encoding(leaf, fi))
2660 bytenr = btrfs_file_extent_disk_bytenr(leaf, fi);
2661 /* skip holes and direct mapped extents */
2662 if (bytenr == 0 || bytenr == offset)
2665 bytenr += btrfs_file_extent_offset(leaf, fi);
2666 num_bytes = btrfs_file_extent_num_bytes(leaf, fi);
2668 cache1 = btrfs_lookup_block_group(root->fs_info, offset);
2669 cache2 = btrfs_lookup_block_group(root->fs_info,
2670 offset + num_bytes - 1);
2671 if (!cache1 || cache1 != cache2 ||
2672 (!(cache1->flags & BTRFS_BLOCK_GROUP_SYSTEM) &&
2673 !intersect_with_sb(offset, num_bytes)))
2676 set_extent_bits(&io_tree, offset, offset + num_bytes - 1,
2677 EXTENT_LOCKED, GFP_NOFS);
2678 set_state_private(&io_tree, offset, bytenr);
2680 offset += btrfs_file_extent_num_bytes(leaf, fi);
2683 btrfs_release_path(&path);
2685 if (offset < total_bytes) {
2686 fprintf(stderr, "unable to build extent mapping\n");
2690 first_free = BTRFS_SUPER_INFO_OFFSET + 2 * sectorsize - 1;
2691 first_free &= ~((u64)sectorsize - 1);
2692 /* backup for extent #0 should exist */
2693 if(!test_range_bit(&io_tree, 0, first_free - 1, EXTENT_LOCKED, 1)) {
2694 fprintf(stderr, "no backup for the first extent\n");
2697 /* force no allocation from system block group */
2698 root->fs_info->system_allocs = -1;
2699 trans = btrfs_start_transaction(root, 1);
2702 * recow the whole chunk tree, this will remove all chunk tree blocks
2703 * from system block group
2705 chunk_root = root->fs_info->chunk_root;
2706 memset(&key, 0, sizeof(key));
2708 ret = btrfs_search_slot(trans, chunk_root, &key, &path, 0, 1);
2712 ret = btrfs_next_leaf(chunk_root, &path);
2716 btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]);
2717 btrfs_release_path(&path);
2719 btrfs_release_path(&path);
2724 cache1 = btrfs_lookup_block_group(root->fs_info, offset);
2728 if (cache1->flags & BTRFS_BLOCK_GROUP_SYSTEM)
2729 num_bytes += btrfs_block_group_used(&cache1->item);
2731 offset = cache1->key.objectid + cache1->key.offset;
2733 /* only extent #0 left in system block group? */
2734 if (num_bytes > first_free) {
2735 fprintf(stderr, "unable to empty system block group\n");
2738 /* create a system chunk that maps the whole device */
2739 ret = prepare_system_chunk_sb(root->fs_info->super_copy);
2741 fprintf(stderr, "unable to update system chunk\n");
2745 ret = btrfs_commit_transaction(trans, root);
2748 ret = close_ctree(root);
2750 fprintf(stderr, "error during close_ctree %d\n", ret);
2754 /* zero btrfs super block mirrors */
2755 memset(buf, 0, sectorsize);
2756 for (i = 1 ; i < BTRFS_SUPER_MIRROR_MAX; i++) {
2757 bytenr = btrfs_sb_offset(i);
2758 if (bytenr >= total_bytes)
2760 ret = pwrite(fd, buf, sectorsize, bytenr);
2761 if (ret != sectorsize) {
2763 "error during zeroing supreblock %d: %d\n",
2769 sb_bytenr = (u64)-1;
2770 /* copy all relocated blocks back */
2772 ret = find_first_extent_bit(&io_tree, 0, &start, &end,
2777 ret = get_state_private(&io_tree, start, &bytenr);
2780 clear_extent_bits(&io_tree, start, end, EXTENT_LOCKED,
2783 while (start <= end) {
2784 if (start == BTRFS_SUPER_INFO_OFFSET) {
2788 ret = pread(fd, buf, sectorsize, bytenr);
2790 fprintf(stderr, "error during pread %d\n", ret);
2793 BUG_ON(ret != sectorsize);
2794 ret = pwrite(fd, buf, sectorsize, start);
2796 fprintf(stderr, "error during pwrite %d\n", ret);
2799 BUG_ON(ret != sectorsize);
2801 start += sectorsize;
2802 bytenr += sectorsize;
2808 fprintf(stderr, "error during fsync %d\n", ret);
2812 * finally, overwrite btrfs super block.
2814 ret = pread(fd, buf, sectorsize, sb_bytenr);
2816 fprintf(stderr, "error during pread %d\n", ret);
2819 BUG_ON(ret != sectorsize);
2820 ret = pwrite(fd, buf, sectorsize, BTRFS_SUPER_INFO_OFFSET);
2822 fprintf(stderr, "error during pwrite %d\n", ret);
2825 BUG_ON(ret != sectorsize);
2828 fprintf(stderr, "error during fsync %d\n", ret);
2834 extent_io_tree_cleanup(&io_tree);
2835 printf("rollback complete.\n");
2842 fprintf(stderr, "rollback aborted.\n");
2846 static void print_usage(void)
2848 printf("usage: btrfs-convert [options] device\n");
2849 printf("options:\n");
2850 printf("\t-d|--no-datasum disable data checksum, sets NODATASUM\n");
2851 printf("\t-i|--no-xattr ignore xattrs and ACLs\n");
2852 printf("\t-n|--no-inline disable inlining of small files to metadata\n");
2853 printf("\t-N|--nodesize SIZE set filesystem metadata nodesize\n");
2854 printf("\t-r|--rollback roll back to ext2fs\n");
2855 printf("\t-l|--label LABEL set filesystem label\n");
2856 printf("\t-L|--copy-label use label from converted filesystem\n");
2857 printf("\t-p|--progress show converting progress (default)\n");
2858 printf("\t-O|--features LIST comma separated list of filesystem features\n");
2859 printf("\t--no-progress show only overview, not the detailed progress\n");
2862 int main(int argc, char *argv[])
2868 u32 nodesize = max_t(u32, sysconf(_SC_PAGESIZE),
2869 BTRFS_MKFS_DEFAULT_NODE_SIZE);
2872 int usage_error = 0;
2875 char fslabel[BTRFS_LABEL_SIZE];
2876 u64 features = BTRFS_MKFS_DEFAULT_FEATURES;
2879 enum { GETOPT_VAL_NO_PROGRESS = 256 };
2880 static const struct option long_options[] = {
2881 { "no-progress", no_argument, NULL,
2882 GETOPT_VAL_NO_PROGRESS },
2883 { "no-datasum", no_argument, NULL, 'd' },
2884 { "no-inline", no_argument, NULL, 'n' },
2885 { "no-xattr", no_argument, NULL, 'i' },
2886 { "rollback", no_argument, NULL, 'r' },
2887 { "features", required_argument, NULL, 'O' },
2888 { "progress", no_argument, NULL, 'p' },
2889 { "label", required_argument, NULL, 'l' },
2890 { "copy-label", no_argument, NULL, 'L' },
2891 { "nodesize", required_argument, NULL, 'N' },
2892 { "help", no_argument, NULL, GETOPT_VAL_HELP},
2893 { NULL, 0, NULL, 0 }
2895 int c = getopt_long(argc, argv, "dinN:rl:LpO:", long_options, NULL);
2910 nodesize = parse_size(optarg);
2917 if (strlen(optarg) >= BTRFS_LABEL_SIZE) {
2919 "WARNING: label too long, trimmed to %d bytes\n",
2920 BTRFS_LABEL_SIZE - 1);
2922 strncpy(fslabel, optarg, BTRFS_LABEL_SIZE - 1);
2923 fslabel[BTRFS_LABEL_SIZE - 1] = 0;
2932 char *orig = strdup(optarg);
2935 tmp = btrfs_parse_fs_features(tmp, &features);
2938 "Unrecognized filesystem feature '%s'\n",
2944 if (features & BTRFS_FEATURE_LIST_ALL) {
2945 btrfs_list_all_fs_features(
2946 ~BTRFS_CONVERT_ALLOWED_FEATURES);
2949 if (features & ~BTRFS_CONVERT_ALLOWED_FEATURES) {
2952 btrfs_parse_features_to_string(buf,
2953 features & ~BTRFS_CONVERT_ALLOWED_FEATURES);
2955 "ERROR: features not allowed for convert: %s\n",
2962 case GETOPT_VAL_NO_PROGRESS:
2965 case GETOPT_VAL_HELP:
2968 return c != GETOPT_VAL_HELP;
2971 argc = argc - optind;
2973 if (check_argc_exact(argc, 1)) {
2978 if (rollback && (!datacsum || noxattr || !packing)) {
2980 "Usage error: -d, -i, -n options do not apply to rollback\n");
2989 file = argv[optind];
2990 ret = check_mounted(file);
2992 fprintf(stderr, "Could not check mount status: %s\n",
2996 fprintf(stderr, "%s is mounted\n", file);
3001 ret = do_rollback(file);
3003 ret = do_convert(file, datacsum, packing, noxattr, nodesize,
3004 copylabel, fslabel, progress, features);