diff options
author | Nicholas D Steeves <nsteeves@gmail.com> | 2016-04-23 00:41:30 +0100 |
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committer | Nicholas D Steeves <nsteeves@gmail.com> | 2016-04-23 00:41:30 +0100 |
commit | cec572daccafa1e912cbed363df6f84687778c6f (patch) | |
tree | 7d99ab9f73d25c1ed8eaf6393f6374edf5316b03 /btrfs-convert.c |
btrfs-progs (4.4.1-1.1) unstable; urgency=medium
* Non-maintainer upload.
* New upstream release.
* Rename package to btrfs-progs (Closes: #780081)
* Update standards version to 3.9.7 (no changes needed).
* debian/control: Add "Breaks" per Gianfranco Costamagna's suggestion
* Change lintian override to reflect package rename
* Switch from using postinst and postrm to using triggers
per Christian Seiler's recommendation.
# imported from the archive
Diffstat (limited to 'btrfs-convert.c')
-rw-r--r-- | btrfs-convert.c | 3206 |
1 files changed, 3206 insertions, 0 deletions
diff --git a/btrfs-convert.c b/btrfs-convert.c new file mode 100644 index 00000000..4baa68ec --- /dev/null +++ b/btrfs-convert.c @@ -0,0 +1,3206 @@ +/* + * Copyright (C) 2007 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License v2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#include "kerncompat.h" + +#include <sys/ioctl.h> +#include <sys/mount.h> +#include <stdio.h> +#include <stdlib.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <fcntl.h> +#include <unistd.h> +#include <uuid/uuid.h> +#include <linux/limits.h> +#include <getopt.h> + +#include "ctree.h" +#include "disk-io.h" +#include "volumes.h" +#include "transaction.h" +#include "crc32c.h" +#include "utils.h" +#include "task-utils.h" +#include <ext2fs/ext2_fs.h> +#include <ext2fs/ext2fs.h> +#include <ext2fs/ext2_ext_attr.h> + +#define INO_OFFSET (BTRFS_FIRST_FREE_OBJECTID - EXT2_ROOT_INO) +#define CONV_IMAGE_SUBVOL_OBJECTID BTRFS_FIRST_FREE_OBJECTID + +struct task_ctx { + uint32_t max_copy_inodes; + uint32_t cur_copy_inodes; + struct task_info *info; +}; + +static void *print_copied_inodes(void *p) +{ + struct task_ctx *priv = p; + const char work_indicator[] = { '.', 'o', 'O', 'o' }; + uint32_t count = 0; + + task_period_start(priv->info, 1000 /* 1s */); + while (1) { + count++; + printf("copy inodes [%c] [%10d/%10d]\r", + work_indicator[count % 4], priv->cur_copy_inodes, + priv->max_copy_inodes); + fflush(stdout); + task_period_wait(priv->info); + } + + return NULL; +} + +static int after_copied_inodes(void *p) +{ + printf("\n"); + fflush(stdout); + + return 0; +} + +struct btrfs_convert_context; +struct btrfs_convert_operations { + const char *name; + int (*open_fs)(struct btrfs_convert_context *cctx, const char *devname); + int (*alloc_block)(struct btrfs_convert_context *cctx, u64 goal, + u64 *block_ret); + int (*alloc_block_range)(struct btrfs_convert_context *cctx, u64 goal, + int num, u64 *block_ret); + int (*test_block)(struct btrfs_convert_context *cctx, u64 block); + void (*free_block)(struct btrfs_convert_context *cctx, u64 block); + void (*free_block_range)(struct btrfs_convert_context *cctx, u64 block, + int num); + int (*copy_inodes)(struct btrfs_convert_context *cctx, + struct btrfs_root *root, int datacsum, + int packing, int noxattr, struct task_ctx *p); + void (*close_fs)(struct btrfs_convert_context *cctx); +}; + +struct btrfs_convert_context { + u32 blocksize; + u32 first_data_block; + u32 block_count; + u32 inodes_count; + u32 free_inodes_count; + u64 total_bytes; + char *volume_name; + const struct btrfs_convert_operations *convert_ops; + + /* The accurate used space of old filesystem */ + struct cache_tree used; + + /* Batched ranges which must be covered by data chunks */ + struct cache_tree data_chunks; + + /* Free space which is not covered by data_chunks */ + struct cache_tree free; + + void *fs_data; +}; + +static void init_convert_context(struct btrfs_convert_context *cctx) +{ + cache_tree_init(&cctx->used); + cache_tree_init(&cctx->data_chunks); + cache_tree_init(&cctx->free); +} + +static void clean_convert_context(struct btrfs_convert_context *cctx) +{ + free_extent_cache_tree(&cctx->used); + free_extent_cache_tree(&cctx->data_chunks); + free_extent_cache_tree(&cctx->free); +} + +static inline int convert_alloc_block(struct btrfs_convert_context *cctx, + u64 goal, u64 *ret) +{ + return cctx->convert_ops->alloc_block(cctx, goal, ret); +} + +static inline int convert_alloc_block_range(struct btrfs_convert_context *cctx, + u64 goal, int num, u64 *ret) +{ + return cctx->convert_ops->alloc_block_range(cctx, goal, num, ret); +} + +static inline int convert_test_block(struct btrfs_convert_context *cctx, + u64 block) +{ + return cctx->convert_ops->test_block(cctx, block); +} + +static inline void convert_free_block(struct btrfs_convert_context *cctx, + u64 block) +{ + cctx->convert_ops->free_block(cctx, block); +} + +static inline void convert_free_block_range(struct btrfs_convert_context *cctx, + u64 block, int num) +{ + cctx->convert_ops->free_block_range(cctx, block, num); +} + +static inline int copy_inodes(struct btrfs_convert_context *cctx, + struct btrfs_root *root, int datacsum, + int packing, int noxattr, struct task_ctx *p) +{ + return cctx->convert_ops->copy_inodes(cctx, root, datacsum, packing, + noxattr, p); +} + +static inline void convert_close_fs(struct btrfs_convert_context *cctx) +{ + cctx->convert_ops->close_fs(cctx); +} + +/* + * Open Ext2fs in readonly mode, read block allocation bitmap and + * inode bitmap into memory. + */ +static int ext2_open_fs(struct btrfs_convert_context *cctx, const char *name) +{ + errcode_t ret; + ext2_filsys ext2_fs; + ext2_ino_t ino; + ret = ext2fs_open(name, 0, 0, 0, unix_io_manager, &ext2_fs); + if (ret) { + fprintf(stderr, "ext2fs_open: %s\n", error_message(ret)); + goto fail; + } + ret = ext2fs_read_inode_bitmap(ext2_fs); + if (ret) { + fprintf(stderr, "ext2fs_read_inode_bitmap: %s\n", + error_message(ret)); + goto fail; + } + ret = ext2fs_read_block_bitmap(ext2_fs); + if (ret) { + fprintf(stderr, "ext2fs_read_block_bitmap: %s\n", + error_message(ret)); + goto fail; + } + /* + * search each block group for a free inode. this set up + * uninit block/inode bitmaps appropriately. + */ + ino = 1; + while (ino <= ext2_fs->super->s_inodes_count) { + ext2_ino_t foo; + ext2fs_new_inode(ext2_fs, ino, 0, NULL, &foo); + ino += EXT2_INODES_PER_GROUP(ext2_fs->super); + } + + if (!(ext2_fs->super->s_feature_incompat & + EXT2_FEATURE_INCOMPAT_FILETYPE)) { + fprintf(stderr, "filetype feature is missing\n"); + goto fail; + } + + cctx->fs_data = ext2_fs; + cctx->blocksize = ext2_fs->blocksize; + cctx->block_count = ext2_fs->super->s_blocks_count; + cctx->total_bytes = ext2_fs->blocksize * ext2_fs->super->s_blocks_count; + cctx->volume_name = strndup(ext2_fs->super->s_volume_name, 16); + cctx->first_data_block = ext2_fs->super->s_first_data_block; + cctx->inodes_count = ext2_fs->super->s_inodes_count; + cctx->free_inodes_count = ext2_fs->super->s_free_inodes_count; + return 0; +fail: + return -1; +} + +static void ext2_close_fs(struct btrfs_convert_context *cctx) +{ + if (cctx->volume_name) { + free(cctx->volume_name); + cctx->volume_name = NULL; + } + ext2fs_close(cctx->fs_data); +} + +static int ext2_alloc_block(struct btrfs_convert_context *cctx, + u64 goal, u64 *block_ret) +{ + ext2_filsys fs = cctx->fs_data; + blk_t block; + + if (!ext2fs_new_block(fs, goal, NULL, &block)) { + ext2fs_fast_mark_block_bitmap(fs->block_map, block); + *block_ret = block; + return 0; + } + return -ENOSPC; +} + +static int ext2_alloc_block_range(struct btrfs_convert_context *cctx, u64 goal, + int num, u64 *block_ret) +{ + ext2_filsys fs = cctx->fs_data; + blk_t block; + ext2fs_block_bitmap bitmap = fs->block_map; + blk_t start = ext2fs_get_block_bitmap_start(bitmap); + blk_t end = ext2fs_get_block_bitmap_end(bitmap); + + for (block = max_t(u64, goal, start); block + num < end; block++) { + if (ext2fs_fast_test_block_bitmap_range(bitmap, block, num)) { + ext2fs_fast_mark_block_bitmap_range(bitmap, block, + num); + *block_ret = block; + return 0; + } + } + return -ENOSPC; +} + +static void ext2_free_block(struct btrfs_convert_context *cctx, u64 block) +{ + ext2_filsys fs = cctx->fs_data; + + BUG_ON(block != (blk_t)block); + ext2fs_fast_unmark_block_bitmap(fs->block_map, block); +} + +static void ext2_free_block_range(struct btrfs_convert_context *cctx, u64 block, int num) +{ + ext2_filsys fs = cctx->fs_data; + + BUG_ON(block != (blk_t)block); + ext2fs_fast_unmark_block_bitmap_range(fs->block_map, block, num); +} + +static int cache_free_extents(struct btrfs_root *root, + struct btrfs_convert_context *cctx) + +{ + int i, ret = 0; + blk_t block; + u64 bytenr; + u64 blocksize = cctx->blocksize; + + block = cctx->first_data_block; + for (; block < cctx->block_count; block++) { + if (convert_test_block(cctx, block)) + continue; + bytenr = block * blocksize; + ret = set_extent_dirty(&root->fs_info->free_space_cache, + bytenr, bytenr + blocksize - 1, 0); + BUG_ON(ret); + } + + for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) { + bytenr = btrfs_sb_offset(i); + bytenr &= ~((u64)BTRFS_STRIPE_LEN - 1); + if (bytenr >= blocksize * cctx->block_count) + break; + clear_extent_dirty(&root->fs_info->free_space_cache, bytenr, + bytenr + BTRFS_STRIPE_LEN - 1, 0); + } + + clear_extent_dirty(&root->fs_info->free_space_cache, + 0, BTRFS_SUPER_INFO_OFFSET - 1, 0); + + return 0; +} + +static int custom_alloc_extent(struct btrfs_root *root, u64 num_bytes, + u64 hint_byte, struct btrfs_key *ins, + int metadata) +{ + u64 start; + u64 end; + u64 last = hint_byte; + int ret; + int wrapped = 0; + struct btrfs_block_group_cache *cache; + + while(1) { + ret = find_first_extent_bit(&root->fs_info->free_space_cache, + last, &start, &end, EXTENT_DIRTY); + if (ret) { + if (wrapped++ == 0) { + last = 0; + continue; + } else { + goto fail; + } + } + + start = max(last, start); + last = end + 1; + if (last - start < num_bytes) + continue; + + last = start + num_bytes; + if (test_range_bit(&root->fs_info->pinned_extents, + start, last - 1, EXTENT_DIRTY, 0)) + continue; + + cache = btrfs_lookup_block_group(root->fs_info, start); + BUG_ON(!cache); + if (cache->flags & BTRFS_BLOCK_GROUP_SYSTEM || + last > cache->key.objectid + cache->key.offset) { + last = cache->key.objectid + cache->key.offset; + continue; + } + + if (metadata) { + BUG_ON(num_bytes != root->nodesize); + if (check_crossing_stripes(start, num_bytes)) { + last = round_down(start + num_bytes, + BTRFS_STRIPE_LEN); + continue; + } + } + clear_extent_dirty(&root->fs_info->free_space_cache, + start, start + num_bytes - 1, 0); + + ins->objectid = start; + ins->offset = num_bytes; + ins->type = BTRFS_EXTENT_ITEM_KEY; + return 0; + } +fail: + fprintf(stderr, "not enough free space\n"); + return -ENOSPC; +} + +static int intersect_with_sb(u64 bytenr, u64 num_bytes) +{ + int i; + u64 offset; + + for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) { + offset = btrfs_sb_offset(i); + offset &= ~((u64)BTRFS_STRIPE_LEN - 1); + + if (bytenr < offset + BTRFS_STRIPE_LEN && + bytenr + num_bytes > offset) + return 1; + } + return 0; +} + +static int custom_free_extent(struct btrfs_root *root, u64 bytenr, + u64 num_bytes) +{ + return intersect_with_sb(bytenr, num_bytes); +} + +static struct btrfs_extent_ops extent_ops = { + .alloc_extent = custom_alloc_extent, + .free_extent = custom_free_extent, +}; + +static int convert_insert_dirent(struct btrfs_trans_handle *trans, + struct btrfs_root *root, + const char *name, size_t name_len, + u64 dir, u64 objectid, + u8 file_type, u64 index_cnt, + struct btrfs_inode_item *inode) +{ + int ret; + u64 inode_size; + struct btrfs_key location = { + .objectid = objectid, + .offset = 0, + .type = BTRFS_INODE_ITEM_KEY, + }; + + ret = btrfs_insert_dir_item(trans, root, name, name_len, + dir, &location, file_type, index_cnt); + if (ret) + return ret; + ret = btrfs_insert_inode_ref(trans, root, name, name_len, + objectid, dir, index_cnt); + if (ret) + return ret; + inode_size = btrfs_stack_inode_size(inode) + name_len * 2; + btrfs_set_stack_inode_size(inode, inode_size); + + return 0; +} + +struct dir_iterate_data { + struct btrfs_trans_handle *trans; + struct btrfs_root *root; + struct btrfs_inode_item *inode; + u64 objectid; + u64 index_cnt; + u64 parent; + int errcode; +}; + +static u8 filetype_conversion_table[EXT2_FT_MAX] = { + [EXT2_FT_UNKNOWN] = BTRFS_FT_UNKNOWN, + [EXT2_FT_REG_FILE] = BTRFS_FT_REG_FILE, + [EXT2_FT_DIR] = BTRFS_FT_DIR, + [EXT2_FT_CHRDEV] = BTRFS_FT_CHRDEV, + [EXT2_FT_BLKDEV] = BTRFS_FT_BLKDEV, + [EXT2_FT_FIFO] = BTRFS_FT_FIFO, + [EXT2_FT_SOCK] = BTRFS_FT_SOCK, + [EXT2_FT_SYMLINK] = BTRFS_FT_SYMLINK, +}; + +static int dir_iterate_proc(ext2_ino_t dir, int entry, + struct ext2_dir_entry *dirent, + int offset, int blocksize, + char *buf,void *priv_data) +{ + int ret; + int file_type; + u64 objectid; + char dotdot[] = ".."; + struct dir_iterate_data *idata = (struct dir_iterate_data *)priv_data; + int name_len; + + name_len = dirent->name_len & 0xFF; + + objectid = dirent->inode + INO_OFFSET; + if (!strncmp(dirent->name, dotdot, name_len)) { + if (name_len == 2) { + BUG_ON(idata->parent != 0); + idata->parent = objectid; + } + return 0; + } + if (dirent->inode < EXT2_GOOD_OLD_FIRST_INO) + return 0; + + file_type = dirent->name_len >> 8; + BUG_ON(file_type > EXT2_FT_SYMLINK); + + ret = convert_insert_dirent(idata->trans, idata->root, dirent->name, + name_len, idata->objectid, objectid, + filetype_conversion_table[file_type], + idata->index_cnt, idata->inode); + if (ret < 0) { + idata->errcode = ret; + return BLOCK_ABORT; + } + + idata->index_cnt++; + return 0; +} + +static int create_dir_entries(struct btrfs_trans_handle *trans, + struct btrfs_root *root, u64 objectid, + struct btrfs_inode_item *btrfs_inode, + ext2_filsys ext2_fs, ext2_ino_t ext2_ino) +{ + int ret; + errcode_t err; + struct dir_iterate_data data = { + .trans = trans, + .root = root, + .inode = btrfs_inode, + .objectid = objectid, + .index_cnt = 2, + .parent = 0, + .errcode = 0, + }; + + err = ext2fs_dir_iterate2(ext2_fs, ext2_ino, 0, NULL, + dir_iterate_proc, &data); + if (err) + goto error; + ret = data.errcode; + if (ret == 0 && data.parent == objectid) { + ret = btrfs_insert_inode_ref(trans, root, "..", 2, + objectid, objectid, 0); + } + return ret; +error: + fprintf(stderr, "ext2fs_dir_iterate2: %s\n", error_message(err)); + return -1; +} + +static int read_disk_extent(struct btrfs_root *root, u64 bytenr, + u32 num_bytes, char *buffer) +{ + int ret; + struct btrfs_fs_devices *fs_devs = root->fs_info->fs_devices; + + ret = pread(fs_devs->latest_bdev, buffer, num_bytes, bytenr); + if (ret != num_bytes) + goto fail; + ret = 0; +fail: + if (ret > 0) + ret = -1; + return ret; +} + +static int csum_disk_extent(struct btrfs_trans_handle *trans, + struct btrfs_root *root, + u64 disk_bytenr, u64 num_bytes) +{ + u32 blocksize = root->sectorsize; + u64 offset; + char *buffer; + int ret = 0; + + buffer = malloc(blocksize); + if (!buffer) + return -ENOMEM; + for (offset = 0; offset < num_bytes; offset += blocksize) { + ret = read_disk_extent(root, disk_bytenr + offset, + blocksize, buffer); + if (ret) + break; + ret = btrfs_csum_file_block(trans, + root->fs_info->csum_root, + disk_bytenr + num_bytes, + disk_bytenr + offset, + buffer, blocksize); + if (ret) + break; + } + free(buffer); + return ret; +} + +struct blk_iterate_data { + struct btrfs_trans_handle *trans; + struct btrfs_root *root; + struct btrfs_inode_item *inode; + u64 objectid; + u64 first_block; + u64 disk_block; + u64 num_blocks; + u64 boundary; + int checksum; + int errcode; +}; + +static void init_blk_iterate_data(struct blk_iterate_data *data, + struct btrfs_trans_handle *trans, + struct btrfs_root *root, + struct btrfs_inode_item *inode, + u64 objectid, int checksum) +{ + data->trans = trans; + data->root = root; + data->inode = inode; + data->objectid = objectid; + data->first_block = 0; + data->disk_block = 0; + data->num_blocks = 0; + data->boundary = (u64)-1; + data->checksum = checksum; + data->errcode = 0; +} + +static int record_file_blocks(struct blk_iterate_data *data, + u64 file_block, u64 disk_block, u64 num_blocks) +{ + int ret; + struct btrfs_root *root = data->root; + u64 file_pos = file_block * root->sectorsize; + u64 disk_bytenr = disk_block * root->sectorsize; + u64 num_bytes = num_blocks * root->sectorsize; + ret = btrfs_record_file_extent(data->trans, data->root, + data->objectid, data->inode, file_pos, + disk_bytenr, num_bytes); + + if (ret || !data->checksum || disk_bytenr == 0) + return ret; + + return csum_disk_extent(data->trans, data->root, disk_bytenr, + num_bytes); +} + +static int block_iterate_proc(u64 disk_block, u64 file_block, + struct blk_iterate_data *idata) +{ + int ret = 0; + int sb_region; + int do_barrier; + struct btrfs_root *root = idata->root; + struct btrfs_block_group_cache *cache; + u64 bytenr = disk_block * root->sectorsize; + + sb_region = intersect_with_sb(bytenr, root->sectorsize); + do_barrier = sb_region || disk_block >= idata->boundary; + if ((idata->num_blocks > 0 && do_barrier) || + (file_block > idata->first_block + idata->num_blocks) || + (disk_block != idata->disk_block + idata->num_blocks)) { + if (idata->num_blocks > 0) { + ret = record_file_blocks(idata, idata->first_block, + idata->disk_block, + idata->num_blocks); + if (ret) + goto fail; + idata->first_block += idata->num_blocks; + idata->num_blocks = 0; + } + if (file_block > idata->first_block) { + ret = record_file_blocks(idata, idata->first_block, + 0, file_block - idata->first_block); + if (ret) + goto fail; + } + + if (sb_region) { + bytenr += BTRFS_STRIPE_LEN - 1; + bytenr &= ~((u64)BTRFS_STRIPE_LEN - 1); + } else { + cache = btrfs_lookup_block_group(root->fs_info, bytenr); + BUG_ON(!cache); + bytenr = cache->key.objectid + cache->key.offset; + } + + idata->first_block = file_block; + idata->disk_block = disk_block; + idata->boundary = bytenr / root->sectorsize; + } + idata->num_blocks++; +fail: + return ret; +} + +static int __block_iterate_proc(ext2_filsys fs, blk_t *blocknr, + e2_blkcnt_t blockcnt, blk_t ref_block, + int ref_offset, void *priv_data) +{ + int ret; + struct blk_iterate_data *idata; + idata = (struct blk_iterate_data *)priv_data; + ret = block_iterate_proc(*blocknr, blockcnt, idata); + if (ret) { + idata->errcode = ret; + return BLOCK_ABORT; + } + return 0; +} + +/* + * traverse file's data blocks, record these data blocks as file extents. + */ +static int create_file_extents(struct btrfs_trans_handle *trans, + struct btrfs_root *root, u64 objectid, + struct btrfs_inode_item *btrfs_inode, + ext2_filsys ext2_fs, ext2_ino_t ext2_ino, + int datacsum, int packing) +{ + int ret; + char *buffer = NULL; + errcode_t err; + u32 last_block; + u32 sectorsize = root->sectorsize; + u64 inode_size = btrfs_stack_inode_size(btrfs_inode); + struct blk_iterate_data data; + + init_blk_iterate_data(&data, trans, root, btrfs_inode, objectid, + datacsum); + + err = ext2fs_block_iterate2(ext2_fs, ext2_ino, BLOCK_FLAG_DATA_ONLY, + NULL, __block_iterate_proc, &data); + if (err) + goto error; + ret = data.errcode; + if (ret) + goto fail; + if (packing && data.first_block == 0 && data.num_blocks > 0 && + inode_size <= BTRFS_MAX_INLINE_DATA_SIZE(root)) { + u64 num_bytes = data.num_blocks * sectorsize; + u64 disk_bytenr = data.disk_block * sectorsize; + u64 nbytes; + + buffer = malloc(num_bytes); + if (!buffer) + return -ENOMEM; + ret = read_disk_extent(root, disk_bytenr, num_bytes, buffer); + if (ret) + goto fail; + if (num_bytes > inode_size) + num_bytes = inode_size; + ret = btrfs_insert_inline_extent(trans, root, objectid, + 0, buffer, num_bytes); + if (ret) + goto fail; + nbytes = btrfs_stack_inode_nbytes(btrfs_inode) + num_bytes; + btrfs_set_stack_inode_nbytes(btrfs_inode, nbytes); + } else if (data.num_blocks > 0) { + ret = record_file_blocks(&data, data.first_block, + data.disk_block, data.num_blocks); + if (ret) + goto fail; + } + data.first_block += data.num_blocks; + last_block = (inode_size + sectorsize - 1) / sectorsize; + if (last_block > data.first_block) { + ret = record_file_blocks(&data, data.first_block, 0, + last_block - data.first_block); + } +fail: + free(buffer); + return ret; +error: + fprintf(stderr, "ext2fs_block_iterate2: %s\n", error_message(err)); + return -1; +} + +static int create_symbol_link(struct btrfs_trans_handle *trans, + struct btrfs_root *root, u64 objectid, + struct btrfs_inode_item *btrfs_inode, + ext2_filsys ext2_fs, ext2_ino_t ext2_ino, + struct ext2_inode *ext2_inode) +{ + int ret; + char *pathname; + u64 inode_size = btrfs_stack_inode_size(btrfs_inode); + if (ext2fs_inode_data_blocks(ext2_fs, ext2_inode)) { + btrfs_set_stack_inode_size(btrfs_inode, inode_size + 1); + ret = create_file_extents(trans, root, objectid, btrfs_inode, + ext2_fs, ext2_ino, 1, 1); + btrfs_set_stack_inode_size(btrfs_inode, inode_size); + return ret; + } + + pathname = (char *)&(ext2_inode->i_block[0]); + BUG_ON(pathname[inode_size] != 0); + ret = btrfs_insert_inline_extent(trans, root, objectid, 0, + pathname, inode_size + 1); + btrfs_set_stack_inode_nbytes(btrfs_inode, inode_size + 1); + return ret; +} + +/* + * Following xattr/acl related codes are based on codes in + * fs/ext3/xattr.c and fs/ext3/acl.c + */ +#define EXT2_XATTR_BHDR(ptr) ((struct ext2_ext_attr_header *)(ptr)) +#define EXT2_XATTR_BFIRST(ptr) \ + ((struct ext2_ext_attr_entry *)(EXT2_XATTR_BHDR(ptr) + 1)) +#define EXT2_XATTR_IHDR(inode) \ + ((struct ext2_ext_attr_header *) ((void *)(inode) + \ + EXT2_GOOD_OLD_INODE_SIZE + (inode)->i_extra_isize)) +#define EXT2_XATTR_IFIRST(inode) \ + ((struct ext2_ext_attr_entry *) ((void *)EXT2_XATTR_IHDR(inode) + \ + sizeof(EXT2_XATTR_IHDR(inode)->h_magic))) + +static int ext2_xattr_check_names(struct ext2_ext_attr_entry *entry, + const void *end) +{ + struct ext2_ext_attr_entry *next; + + while (!EXT2_EXT_IS_LAST_ENTRY(entry)) { + next = EXT2_EXT_ATTR_NEXT(entry); + if ((void *)next >= end) + return -EIO; + entry = next; + } + return 0; +} + +static int ext2_xattr_check_block(const char *buf, size_t size) +{ + int error; + struct ext2_ext_attr_header *header = EXT2_XATTR_BHDR(buf); + + if (header->h_magic != EXT2_EXT_ATTR_MAGIC || + header->h_blocks != 1) + return -EIO; + error = ext2_xattr_check_names(EXT2_XATTR_BFIRST(buf), buf + size); + return error; +} + +static int ext2_xattr_check_entry(struct ext2_ext_attr_entry *entry, + size_t size) +{ + size_t value_size = entry->e_value_size; + + if (entry->e_value_block != 0 || value_size > size || + entry->e_value_offs + value_size > size) + return -EIO; + return 0; +} + +#define EXT2_ACL_VERSION 0x0001 + +/* 23.2.5 acl_tag_t values */ + +#define ACL_UNDEFINED_TAG (0x00) +#define ACL_USER_OBJ (0x01) +#define ACL_USER (0x02) +#define ACL_GROUP_OBJ (0x04) +#define ACL_GROUP (0x08) +#define ACL_MASK (0x10) +#define ACL_OTHER (0x20) + +/* 23.2.7 ACL qualifier constants */ + +#define ACL_UNDEFINED_ID ((id_t)-1) + +typedef struct { + __le16 e_tag; + __le16 e_perm; + __le32 e_id; +} ext2_acl_entry; + +typedef struct { + __le16 e_tag; + __le16 e_perm; +} ext2_acl_entry_short; + +typedef struct { + __le32 a_version; +} ext2_acl_header; + +static inline int ext2_acl_count(size_t size) +{ + ssize_t s; + size -= sizeof(ext2_acl_header); + s = size - 4 * sizeof(ext2_acl_entry_short); + if (s < 0) { + if (size % sizeof(ext2_acl_entry_short)) + return -1; + return size / sizeof(ext2_acl_entry_short); + } else { + if (s % sizeof(ext2_acl_entry)) + return -1; + return s / sizeof(ext2_acl_entry) + 4; + } +} + +#define ACL_EA_VERSION 0x0002 + +typedef struct { + __le16 e_tag; + __le16 e_perm; + __le32 e_id; +} acl_ea_entry; + +typedef struct { + __le32 a_version; + acl_ea_entry a_entries[0]; +} acl_ea_header; + +static inline size_t acl_ea_size(int count) +{ + return sizeof(acl_ea_header) + count * sizeof(acl_ea_entry); +} + +static int ext2_acl_to_xattr(void *dst, const void *src, + size_t dst_size, size_t src_size) +{ + int i, count; + const void *end = src + src_size; + acl_ea_header *ext_acl = (acl_ea_header *)dst; + acl_ea_entry *dst_entry = ext_acl->a_entries; + ext2_acl_entry *src_entry; + + if (src_size < sizeof(ext2_acl_header)) + goto fail; + if (((ext2_acl_header *)src)->a_version != + cpu_to_le32(EXT2_ACL_VERSION)) + goto fail; + src += sizeof(ext2_acl_header); + count = ext2_acl_count(src_size); + if (count <= 0) + goto fail; + + BUG_ON(dst_size < acl_ea_size(count)); + ext_acl->a_version = cpu_to_le32(ACL_EA_VERSION); + for (i = 0; i < count; i++, dst_entry++) { + src_entry = (ext2_acl_entry *)src; + if (src + sizeof(ext2_acl_entry_short) > end) + goto fail; + dst_entry->e_tag = src_entry->e_tag; + dst_entry->e_perm = src_entry->e_perm; + switch (le16_to_cpu(src_entry->e_tag)) { + case ACL_USER_OBJ: + case ACL_GROUP_OBJ: + case ACL_MASK: + case ACL_OTHER: + src += sizeof(ext2_acl_entry_short); + dst_entry->e_id = cpu_to_le32(ACL_UNDEFINED_ID); + break; + case ACL_USER: + case ACL_GROUP: + src += sizeof(ext2_acl_entry); + if (src > end) + goto fail; + dst_entry->e_id = src_entry->e_id; + break; + default: + goto fail; + } + } + if (src != end) + goto fail; + return 0; +fail: + return -EINVAL; +} + +static char *xattr_prefix_table[] = { + [1] = "user.", + [2] = "system.posix_acl_access", + [3] = "system.posix_acl_default", + [4] = "trusted.", + [6] = "security.", +}; + +static int copy_single_xattr(struct btrfs_trans_handle *trans, + struct btrfs_root *root, u64 objectid, + struct ext2_ext_attr_entry *entry, + const void *data, u32 datalen) +{ + int ret = 0; + int name_len; + int name_index; + void *databuf = NULL; + char namebuf[XATTR_NAME_MAX + 1]; + + name_index = entry->e_name_index; + if (name_index >= ARRAY_SIZE(xattr_prefix_table) || + xattr_prefix_table[name_index] == NULL) + return -EOPNOTSUPP; + name_len = strlen(xattr_prefix_table[name_index]) + + entry->e_name_len; + if (name_len >= sizeof(namebuf)) + return -ERANGE; + + if (name_index == 2 || name_index == 3) { + size_t bufsize = acl_ea_size(ext2_acl_count(datalen)); + databuf = malloc(bufsize); + if (!databuf) + return -ENOMEM; + ret = ext2_acl_to_xattr(databuf, data, bufsize, datalen); + if (ret) + goto out; + data = databuf; + datalen = bufsize; + } + strncpy(namebuf, xattr_prefix_table[name_index], XATTR_NAME_MAX); + strncat(namebuf, EXT2_EXT_ATTR_NAME(entry), entry->e_name_len); + if (name_len + datalen > BTRFS_LEAF_DATA_SIZE(root) - + sizeof(struct btrfs_item) - sizeof(struct btrfs_dir_item)) { + fprintf(stderr, "skip large xattr on inode %Lu name %.*s\n", + objectid - INO_OFFSET, name_len, namebuf); + goto out; + } + ret = btrfs_insert_xattr_item(trans, root, namebuf, name_len, + data, datalen, objectid); +out: + free(databuf); + return ret; +} + +static int copy_extended_attrs(struct btrfs_trans_handle *trans, + struct btrfs_root *root, u64 objectid, + struct btrfs_inode_item *btrfs_inode, + ext2_filsys ext2_fs, ext2_ino_t ext2_ino) +{ + int ret = 0; + int inline_ea = 0; + errcode_t err; + u32 datalen; + u32 block_size = ext2_fs->blocksize; + u32 inode_size = EXT2_INODE_SIZE(ext2_fs->super); + struct ext2_inode_large *ext2_inode; + struct ext2_ext_attr_entry *entry; + void *data; + char *buffer = NULL; + char inode_buf[EXT2_GOOD_OLD_INODE_SIZE]; + + if (inode_size <= EXT2_GOOD_OLD_INODE_SIZE) { + ext2_inode = (struct ext2_inode_large *)inode_buf; + } else { + ext2_inode = (struct ext2_inode_large *)malloc(inode_size); + if (!ext2_inode) + return -ENOMEM; + } + err = ext2fs_read_inode_full(ext2_fs, ext2_ino, (void *)ext2_inode, + inode_size); + if (err) { + fprintf(stderr, "ext2fs_read_inode_full: %s\n", + error_message(err)); + ret = -1; + goto out; + } + + if (ext2_ino > ext2_fs->super->s_first_ino && + inode_size > EXT2_GOOD_OLD_INODE_SIZE) { + if (EXT2_GOOD_OLD_INODE_SIZE + + ext2_inode->i_extra_isize > inode_size) { + ret = -EIO; + goto out; + } + if (ext2_inode->i_extra_isize != 0 && + EXT2_XATTR_IHDR(ext2_inode)->h_magic == + EXT2_EXT_ATTR_MAGIC) { + inline_ea = 1; + } + } + if (inline_ea) { + int total; + void *end = (void *)ext2_inode + inode_size; + entry = EXT2_XATTR_IFIRST(ext2_inode); + total = end - (void *)entry; + ret = ext2_xattr_check_names(entry, end); + if (ret) + goto out; + while (!EXT2_EXT_IS_LAST_ENTRY(entry)) { + ret = ext2_xattr_check_entry(entry, total); + if (ret) + goto out; + data = (void *)EXT2_XATTR_IFIRST(ext2_inode) + + entry->e_value_offs; + datalen = entry->e_value_size; + ret = copy_single_xattr(trans, root, objectid, + entry, data, datalen); + if (ret) + goto out; + entry = EXT2_EXT_ATTR_NEXT(entry); + } + } + + if (ext2_inode->i_file_acl == 0) + goto out; + + buffer = malloc(block_size); + if (!buffer) { + ret = -ENOMEM; + goto out; + } + err = ext2fs_read_ext_attr(ext2_fs, ext2_inode->i_file_acl, buffer); + if (err) { + fprintf(stderr, "ext2fs_read_ext_attr: %s\n", + error_message(err)); + ret = -1; + goto out; + } + ret = ext2_xattr_check_block(buffer, block_size); + if (ret) + goto out; + + entry = EXT2_XATTR_BFIRST(buffer); + while (!EXT2_EXT_IS_LAST_ENTRY(entry)) { + ret = ext2_xattr_check_entry(entry, block_size); + if (ret) + goto out; + data = buffer + entry->e_value_offs; + datalen = entry->e_value_size; + ret = copy_single_xattr(trans, root, objectid, + entry, data, datalen); + if (ret) + goto out; + entry = EXT2_EXT_ATTR_NEXT(entry); + } +out: + free(buffer); + if ((void *)ext2_inode != inode_buf) + free(ext2_inode); + return ret; +} +#define MINORBITS 20 +#define MKDEV(ma, mi) (((ma) << MINORBITS) | (mi)) + +static inline dev_t old_decode_dev(u16 val) +{ + return MKDEV((val >> 8) & 255, val & 255); +} + +static inline dev_t new_decode_dev(u32 dev) +{ + unsigned major = (dev & 0xfff00) >> 8; + unsigned minor = (dev & 0xff) | ((dev >> 12) & 0xfff00); + return MKDEV(major, minor); +} + +static int copy_inode_item(struct btrfs_inode_item *dst, + struct ext2_inode *src, u32 blocksize) +{ + btrfs_set_stack_inode_generation(dst, 1); + btrfs_set_stack_inode_sequence(dst, 0); + btrfs_set_stack_inode_transid(dst, 1); + btrfs_set_stack_inode_size(dst, src->i_size); + btrfs_set_stack_inode_nbytes(dst, 0); + btrfs_set_stack_inode_block_group(dst, 0); + btrfs_set_stack_inode_nlink(dst, src->i_links_count); + btrfs_set_stack_inode_uid(dst, src->i_uid | (src->i_uid_high << 16)); + btrfs_set_stack_inode_gid(dst, src->i_gid | (src->i_gid_high << 16)); + btrfs_set_stack_inode_mode(dst, src->i_mode); + btrfs_set_stack_inode_rdev(dst, 0); + btrfs_set_stack_inode_flags(dst, 0); + btrfs_set_stack_timespec_sec(&dst->atime, src->i_atime); + btrfs_set_stack_timespec_nsec(&dst->atime, 0); + btrfs_set_stack_timespec_sec(&dst->ctime, src->i_ctime); + btrfs_set_stack_timespec_nsec(&dst->ctime, 0); + btrfs_set_stack_timespec_sec(&dst->mtime, src->i_mtime); + btrfs_set_stack_timespec_nsec(&dst->mtime, 0); + btrfs_set_stack_timespec_sec(&dst->otime, 0); + btrfs_set_stack_timespec_nsec(&dst->otime, 0); + + if (S_ISDIR(src->i_mode)) { + btrfs_set_stack_inode_size(dst, 0); + btrfs_set_stack_inode_nlink(dst, 1); + } + if (S_ISREG(src->i_mode)) { + btrfs_set_stack_inode_size(dst, (u64)src->i_size_high << 32 | + (u64)src->i_size); + } + if (!S_ISREG(src->i_mode) && !S_ISDIR(src->i_mode) && + !S_ISLNK(src->i_mode)) { + if (src->i_block[0]) { + btrfs_set_stack_inode_rdev(dst, + old_decode_dev(src->i_block[0])); + } else { + btrfs_set_stack_inode_rdev(dst, + new_decode_dev(src->i_block[1])); + } + } + memset(&dst->reserved, 0, sizeof(dst->reserved)); + + return 0; +} + +/* + * copy a single inode. do all the required works, such as cloning + * inode item, creating file extents and creating directory entries. + */ +static int copy_single_inode(struct btrfs_trans_handle *trans, + struct btrfs_root *root, u64 objectid, + ext2_filsys ext2_fs, ext2_ino_t ext2_ino, + struct ext2_inode *ext2_inode, + int datacsum, int packing, int noxattr) +{ + int ret; + struct btrfs_inode_item btrfs_inode; + + if (ext2_inode->i_links_count == 0) + return 0; + + copy_inode_item(&btrfs_inode, ext2_inode, ext2_fs->blocksize); + if (!datacsum && S_ISREG(ext2_inode->i_mode)) { + u32 flags = btrfs_stack_inode_flags(&btrfs_inode) | + BTRFS_INODE_NODATASUM; + btrfs_set_stack_inode_flags(&btrfs_inode, flags); + } + + switch (ext2_inode->i_mode & S_IFMT) { + case S_IFREG: + ret = create_file_extents(trans, root, objectid, &btrfs_inode, + ext2_fs, ext2_ino, datacsum, packing); + break; + case S_IFDIR: + ret = create_dir_entries(trans, root, objectid, &btrfs_inode, + ext2_fs, ext2_ino); + break; + case S_IFLNK: + ret = create_symbol_link(trans, root, objectid, &btrfs_inode, + ext2_fs, ext2_ino, ext2_inode); + break; + default: + ret = 0; + break; + } + if (ret) + return ret; + + if (!noxattr) { + ret = copy_extended_attrs(trans, root, objectid, &btrfs_inode, + ext2_fs, ext2_ino); + if (ret) + return ret; + } + return btrfs_insert_inode(trans, root, objectid, &btrfs_inode); +} + +static int copy_disk_extent(struct btrfs_root *root, u64 dst_bytenr, + u64 src_bytenr, u32 num_bytes) +{ + int ret; + char *buffer; + struct btrfs_fs_devices *fs_devs = root->fs_info->fs_devices; + + buffer = malloc(num_bytes); + if (!buffer) + return -ENOMEM; + ret = pread(fs_devs->latest_bdev, buffer, num_bytes, src_bytenr); + if (ret != num_bytes) + goto fail; + ret = pwrite(fs_devs->latest_bdev, buffer, num_bytes, dst_bytenr); + if (ret != num_bytes) + goto fail; + ret = 0; +fail: + free(buffer); + if (ret > 0) + ret = -1; + return ret; +} +/* + * scan ext2's inode bitmap and copy all used inodes. + */ +static int ext2_copy_inodes(struct btrfs_convert_context *cctx, + struct btrfs_root *root, + int datacsum, int packing, int noxattr, struct task_ctx *p) +{ + ext2_filsys ext2_fs = cctx->fs_data; + int ret; + errcode_t err; + ext2_inode_scan ext2_scan; + struct ext2_inode ext2_inode; + ext2_ino_t ext2_ino; + u64 objectid; + struct btrfs_trans_handle *trans; + + trans = btrfs_start_transaction(root, 1); + if (!trans) + return -ENOMEM; + err = ext2fs_open_inode_scan(ext2_fs, 0, &ext2_scan); + if (err) { + fprintf(stderr, "ext2fs_open_inode_scan: %s\n", error_message(err)); + return -1; + } + while (!(err = ext2fs_get_next_inode(ext2_scan, &ext2_ino, + &ext2_inode))) { + /* no more inodes */ + if (ext2_ino == 0) + break; + /* skip special inode in ext2fs */ + if (ext2_ino < EXT2_GOOD_OLD_FIRST_INO && + ext2_ino != EXT2_ROOT_INO) + continue; + objectid = ext2_ino + INO_OFFSET; + ret = copy_single_inode(trans, root, + objectid, ext2_fs, ext2_ino, + &ext2_inode, datacsum, packing, + noxattr); + p->cur_copy_inodes++; + if (ret) + return ret; + if (trans->blocks_used >= 4096) { + ret = btrfs_commit_transaction(trans, root); + BUG_ON(ret); + trans = btrfs_start_transaction(root, 1); + BUG_ON(!trans); + } + } + if (err) { + fprintf(stderr, "ext2fs_get_next_inode: %s\n", error_message(err)); + return -1; + } + ret = btrfs_commit_transaction(trans, root); + BUG_ON(ret); + ext2fs_close_inode_scan(ext2_scan); + + return ret; +} + +static int ext2_test_block(struct btrfs_convert_context *cctx, u64 block) +{ + ext2_filsys ext2_fs = cctx->fs_data; + + BUG_ON(block != (u32)block); + return ext2fs_fast_test_block_bitmap(ext2_fs->block_map, block); +} + +/* + * Construct a range of ext2fs image file. + * scan block allocation bitmap, find all blocks used by the ext2fs + * in this range and create file extents that point to these blocks. + * + * Note: Before calling the function, no file extent points to blocks + * in this range + */ +static int create_image_file_range(struct btrfs_trans_handle *trans, + struct btrfs_root *root, u64 objectid, + struct btrfs_inode_item *inode, + u64 start_byte, u64 end_byte, + struct btrfs_convert_context *cctx, int datacsum) +{ + u32 blocksize = cctx->blocksize; + u32 block = start_byte / blocksize; + u32 last_block = (end_byte + blocksize - 1) / blocksize; + int ret = 0; + struct blk_iterate_data data; + + init_blk_iterate_data(&data, trans, root, inode, objectid, datacsum); + data.first_block = block; + + for (; start_byte < end_byte; block++, start_byte += blocksize) { + if (!convert_test_block(cctx, block)) + continue; + ret = block_iterate_proc(block, block, &data); + if (ret < 0) + goto fail; + } + if (data.num_blocks > 0) { + ret = record_file_blocks(&data, data.first_block, + data.disk_block, data.num_blocks); + if (ret) + goto fail; + data.first_block += data.num_blocks; + } + if (last_block > data.first_block) { + ret = record_file_blocks(&data, data.first_block, 0, + last_block - data.first_block); + if (ret) + goto fail; + } +fail: + return ret; +} +/* + * Create the fs image file. + */ +static int create_image(struct btrfs_convert_context *cctx, + struct btrfs_root *root, const char *name, int datacsum) +{ + int ret; + struct btrfs_key key; + struct btrfs_key location; + struct btrfs_path path; + struct btrfs_inode_item btrfs_inode; + struct btrfs_inode_item *inode_item; + struct extent_buffer *leaf; + struct btrfs_fs_info *fs_info = root->fs_info; + struct btrfs_root *extent_root = fs_info->extent_root; + struct btrfs_trans_handle *trans; + struct btrfs_extent_item *ei; + struct btrfs_extent_inline_ref *iref; + struct btrfs_extent_data_ref *dref; + u64 bytenr; + u64 num_bytes; + u64 objectid; + u64 last_byte; + u64 first_free; + u64 total_bytes; + u64 flags = BTRFS_INODE_READONLY; + u32 sectorsize = root->sectorsize; + + total_bytes = btrfs_super_total_bytes(fs_info->super_copy); + first_free = BTRFS_SUPER_INFO_OFFSET + sectorsize * 2 - 1; + first_free &= ~((u64)sectorsize - 1); + if (!datacsum) + flags |= BTRFS_INODE_NODATASUM; + + memset(&btrfs_inode, 0, sizeof(btrfs_inode)); + btrfs_set_stack_inode_generation(&btrfs_inode, 1); + btrfs_set_stack_inode_size(&btrfs_inode, total_bytes); + btrfs_set_stack_inode_nlink(&btrfs_inode, 1); + btrfs_set_stack_inode_nbytes(&btrfs_inode, 0); + btrfs_set_stack_inode_mode(&btrfs_inode, S_IFREG | 0400); + btrfs_set_stack_inode_flags(&btrfs_inode, flags); + btrfs_init_path(&path); + trans = btrfs_start_transaction(root, 1); + BUG_ON(!trans); + + objectid = btrfs_root_dirid(&root->root_item); + ret = btrfs_find_free_objectid(trans, root, objectid, &objectid); + if (ret) + goto fail; + + /* + * copy blocks covered by extent #0 to new positions. extent #0 is + * special, we can't rely on relocate_extents_range to relocate it. + */ + for (last_byte = 0; last_byte < first_free; last_byte += sectorsize) { + ret = custom_alloc_extent(root, sectorsize, 0, &key, 0); + if (ret) + goto fail; + ret = copy_disk_extent(root, key.objectid, last_byte, + sectorsize); + if (ret) + goto fail; + ret = btrfs_record_file_extent(trans, root, objectid, + &btrfs_inode, last_byte, + key.objectid, sectorsize); + if (ret) + goto fail; + if (datacsum) { + ret = csum_disk_extent(trans, root, key.objectid, + sectorsize); + if (ret) + goto fail; + } + } + + while(1) { + key.objectid = last_byte; + key.offset = 0; + btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); + ret = btrfs_search_slot(trans, fs_info->extent_root, + &key, &path, 0, 0); + if (ret < 0) + goto fail; +next: + leaf = path.nodes[0]; + if (path.slots[0] >= btrfs_header_nritems(leaf)) { + ret = btrfs_next_leaf(extent_root, &path); + if (ret < 0) + goto fail; + if (ret > 0) + break; + leaf = path.nodes[0]; + } + btrfs_item_key_to_cpu(leaf, &key, path.slots[0]); + if (last_byte > key.objectid || + key.type != BTRFS_EXTENT_ITEM_KEY) { + path.slots[0]++; + goto next; + } + + bytenr = key.objectid; + num_bytes = key.offset; + ei = btrfs_item_ptr(leaf, path.slots[0], + struct btrfs_extent_item); + if (!(btrfs_extent_flags(leaf, ei) & BTRFS_EXTENT_FLAG_DATA)) { + path.slots[0]++; + goto next; + } + + BUG_ON(btrfs_item_size_nr(leaf, path.slots[0]) != sizeof(*ei) + + btrfs_extent_inline_ref_size(BTRFS_EXTENT_DATA_REF_KEY)); + + iref = (struct btrfs_extent_inline_ref *)(ei + 1); + key.type = btrfs_extent_inline_ref_type(leaf, iref); + BUG_ON(key.type != BTRFS_EXTENT_DATA_REF_KEY); + dref = (struct btrfs_extent_data_ref *)(&iref->offset); + if (btrfs_extent_data_ref_root(leaf, dref) != + BTRFS_FS_TREE_OBJECTID) { + path.slots[0]++; + goto next; + } + + if (bytenr > last_byte) { + ret = create_image_file_range(trans, root, objectid, + &btrfs_inode, last_byte, + bytenr, cctx, + datacsum); + if (ret) + goto fail; + } + ret = btrfs_record_file_extent(trans, root, objectid, + &btrfs_inode, bytenr, bytenr, + num_bytes); + if (ret) + goto fail; + last_byte = bytenr + num_bytes; + btrfs_release_path(&path); + + if (trans->blocks_used >= 4096) { + ret = btrfs_commit_transaction(trans, root); + BUG_ON(ret); + trans = btrfs_start_transaction(root, 1); + BUG_ON(!trans); + } + } + btrfs_release_path(&path); + if (total_bytes > last_byte) { + ret = create_image_file_range(trans, root, objectid, + &btrfs_inode, last_byte, + total_bytes, cctx, + datacsum); + if (ret) + goto fail; + } + + ret = btrfs_insert_inode(trans, root, objectid, &btrfs_inode); + if (ret) + goto fail; + + location.objectid = objectid; + location.offset = 0; + btrfs_set_key_type(&location, BTRFS_INODE_ITEM_KEY); + ret = btrfs_insert_dir_item(trans, root, name, strlen(name), + btrfs_root_dirid(&root->root_item), + &location, BTRFS_FT_REG_FILE, objectid); + if (ret) + goto fail; + ret = btrfs_insert_inode_ref(trans, root, name, strlen(name), + objectid, + btrfs_root_dirid(&root->root_item), + objectid); + if (ret) + goto fail; + location.objectid = btrfs_root_dirid(&root->root_item); + location.offset = 0; + btrfs_set_key_type(&location, BTRFS_INODE_ITEM_KEY); + ret = btrfs_lookup_inode(trans, root, &path, &location, 1); + if (ret) + goto fail; + leaf = path.nodes[0]; + inode_item = btrfs_item_ptr(leaf, path.slots[0], + struct btrfs_inode_item); + btrfs_set_inode_size(leaf, inode_item, strlen(name) * 2 + + btrfs_inode_size(leaf, inode_item)); + btrfs_mark_buffer_dirty(leaf); + btrfs_release_path(&path); + ret = btrfs_commit_transaction(trans, root); + BUG_ON(ret); +fail: + btrfs_release_path(&path); + return ret; +} + +static struct btrfs_root * link_subvol(struct btrfs_root *root, + const char *base, u64 root_objectid) +{ + struct btrfs_trans_handle *trans; + struct btrfs_fs_info *fs_info = root->fs_info; + struct btrfs_root *tree_root = fs_info->tree_root; + struct btrfs_root *new_root = NULL; + struct btrfs_path *path; + struct btrfs_inode_item *inode_item; + struct extent_buffer *leaf; + struct btrfs_key key; + u64 dirid = btrfs_root_dirid(&root->root_item); + u64 index = 2; + char buf[BTRFS_NAME_LEN + 1]; /* for snprintf null */ + int len; + int i; + int ret; + + len = strlen(base); + if (len == 0 || len > BTRFS_NAME_LEN) + return NULL; + + path = btrfs_alloc_path(); + BUG_ON(!path); + + key.objectid = dirid; + key.type = BTRFS_DIR_INDEX_KEY; + key.offset = (u64)-1; + + ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); + BUG_ON(ret <= 0); + + if (path->slots[0] > 0) { + path->slots[0]--; + btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); + if (key.objectid == dirid && key.type == BTRFS_DIR_INDEX_KEY) + index = key.offset + 1; + } + btrfs_release_path(path); + + trans = btrfs_start_transaction(root, 1); + BUG_ON(!trans); + + key.objectid = dirid; + key.offset = 0; + key.type = BTRFS_INODE_ITEM_KEY; + + ret = btrfs_lookup_inode(trans, root, path, &key, 1); + BUG_ON(ret); + leaf = path->nodes[0]; + inode_item = btrfs_item_ptr(leaf, path->slots[0], + struct btrfs_inode_item); + + key.objectid = root_objectid; + key.offset = (u64)-1; + key.type = BTRFS_ROOT_ITEM_KEY; + + memcpy(buf, base, len); + for (i = 0; i < 1024; i++) { + ret = btrfs_insert_dir_item(trans, root, buf, len, + dirid, &key, BTRFS_FT_DIR, index); + if (ret != -EEXIST) + break; + len = snprintf(buf, ARRAY_SIZE(buf), "%s%d", base, i); + if (len < 1 || len > BTRFS_NAME_LEN) { + ret = -EINVAL; + break; + } + } + if (ret) + goto fail; + + btrfs_set_inode_size(leaf, inode_item, len * 2 + + btrfs_inode_size(leaf, inode_item)); + btrfs_mark_buffer_dirty(leaf); + btrfs_release_path(path); + + /* add the backref first */ + ret = btrfs_add_root_ref(trans, tree_root, root_objectid, + BTRFS_ROOT_BACKREF_KEY, + root->root_key.objectid, + dirid, index, buf, len); + BUG_ON(ret); + + /* now add the forward ref */ + ret = btrfs_add_root_ref(trans, tree_root, root->root_key.objectid, + BTRFS_ROOT_REF_KEY, root_objectid, + dirid, index, buf, len); + + ret = btrfs_commit_transaction(trans, root); + BUG_ON(ret); + + new_root = btrfs_read_fs_root(fs_info, &key); + if (IS_ERR(new_root)) + new_root = NULL; +fail: + btrfs_free_path(path); + return new_root; +} + +static int create_chunk_mapping(struct btrfs_trans_handle *trans, + struct btrfs_root *root) +{ + struct btrfs_fs_info *info = root->fs_info; + struct btrfs_root *chunk_root = info->chunk_root; + struct btrfs_root *extent_root = info->extent_root; + struct btrfs_device *device; + struct btrfs_block_group_cache *cache; + struct btrfs_dev_extent *extent; + struct extent_buffer *leaf; + struct btrfs_chunk chunk; + struct btrfs_key key; + struct btrfs_path path; + u64 cur_start; + u64 total_bytes; + u64 chunk_objectid; + int ret; + + btrfs_init_path(&path); + + total_bytes = btrfs_super_total_bytes(root->fs_info->super_copy); + chunk_objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID; + + BUG_ON(list_empty(&info->fs_devices->devices)); + device = list_entry(info->fs_devices->devices.next, + struct btrfs_device, dev_list); + BUG_ON(device->devid != info->fs_devices->latest_devid); + + /* delete device extent created by make_btrfs */ + key.objectid = device->devid; + key.offset = 0; + key.type = BTRFS_DEV_EXTENT_KEY; + ret = btrfs_search_slot(trans, device->dev_root, &key, &path, -1, 1); + if (ret < 0) + goto err; + + BUG_ON(ret > 0); + ret = btrfs_del_item(trans, device->dev_root, &path); + if (ret) + goto err; + btrfs_release_path(&path); + + /* delete chunk item created by make_btrfs */ + key.objectid = chunk_objectid; + key.offset = 0; + key.type = BTRFS_CHUNK_ITEM_KEY; + ret = btrfs_search_slot(trans, chunk_root, &key, &path, -1, 1); + if (ret < 0) + goto err; + + BUG_ON(ret > 0); + ret = btrfs_del_item(trans, chunk_root, &path); + if (ret) + goto err; + btrfs_release_path(&path); + + /* for each block group, create device extent and chunk item */ + cur_start = 0; + while (cur_start < total_bytes) { + cache = btrfs_lookup_block_group(root->fs_info, cur_start); + BUG_ON(!cache); + + /* insert device extent */ + key.objectid = device->devid; + key.offset = cache->key.objectid; + key.type = BTRFS_DEV_EXTENT_KEY; + ret = btrfs_insert_empty_item(trans, device->dev_root, &path, + &key, sizeof(*extent)); + if (ret) + goto err; + + leaf = path.nodes[0]; + extent = btrfs_item_ptr(leaf, path.slots[0], + struct btrfs_dev_extent); + + btrfs_set_dev_extent_chunk_tree(leaf, extent, + chunk_root->root_key.objectid); + btrfs_set_dev_extent_chunk_objectid(leaf, extent, + chunk_objectid); + btrfs_set_dev_extent_chunk_offset(leaf, extent, + cache->key.objectid); + btrfs_set_dev_extent_length(leaf, extent, cache->key.offset); + write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, + (unsigned long)btrfs_dev_extent_chunk_tree_uuid(extent), + BTRFS_UUID_SIZE); + btrfs_mark_buffer_dirty(leaf); + btrfs_release_path(&path); + + /* insert chunk item */ + btrfs_set_stack_chunk_length(&chunk, cache->key.offset); + btrfs_set_stack_chunk_owner(&chunk, + extent_root->root_key.objectid); + btrfs_set_stack_chunk_stripe_len(&chunk, BTRFS_STRIPE_LEN); + btrfs_set_stack_chunk_type(&chunk, cache->flags); + btrfs_set_stack_chunk_io_align(&chunk, device->io_align); + btrfs_set_stack_chunk_io_width(&chunk, device->io_width); + btrfs_set_stack_chunk_sector_size(&chunk, device->sector_size); + btrfs_set_stack_chunk_num_stripes(&chunk, 1); + btrfs_set_stack_chunk_sub_stripes(&chunk, 0); + btrfs_set_stack_stripe_devid(&chunk.stripe, device->devid); + btrfs_set_stack_stripe_offset(&chunk.stripe, + cache->key.objectid); + memcpy(&chunk.stripe.dev_uuid, device->uuid, BTRFS_UUID_SIZE); + + key.objectid = chunk_objectid; + key.offset = cache->key.objectid; + key.type = BTRFS_CHUNK_ITEM_KEY; + + ret = btrfs_insert_item(trans, chunk_root, &key, &chunk, + btrfs_chunk_item_size(1)); + if (ret) + goto err; + + cur_start = cache->key.objectid + cache->key.offset; + } + + device->bytes_used = total_bytes; + ret = btrfs_update_device(trans, device); +err: + btrfs_release_path(&path); + return ret; +} + +static int create_subvol(struct btrfs_trans_handle *trans, + struct btrfs_root *root, u64 root_objectid) +{ + struct extent_buffer *tmp; + struct btrfs_root *new_root; + struct btrfs_key key; + struct btrfs_root_item root_item; + int ret; + + ret = btrfs_copy_root(trans, root, root->node, &tmp, + root_objectid); + BUG_ON(ret); + + memcpy(&root_item, &root->root_item, sizeof(root_item)); + btrfs_set_root_bytenr(&root_item, tmp->start); + btrfs_set_root_level(&root_item, btrfs_header_level(tmp)); + btrfs_set_root_generation(&root_item, trans->transid); + free_extent_buffer(tmp); + + key.objectid = root_objectid; + key.type = BTRFS_ROOT_ITEM_KEY; + key.offset = trans->transid; + ret = btrfs_insert_root(trans, root->fs_info->tree_root, + &key, &root_item); + + key.offset = (u64)-1; + new_root = btrfs_read_fs_root(root->fs_info, &key); + BUG_ON(!new_root || IS_ERR(new_root)); + + ret = btrfs_make_root_dir(trans, new_root, BTRFS_FIRST_FREE_OBJECTID); + BUG_ON(ret); + + return 0; +} + +static int init_btrfs(struct btrfs_root *root) +{ + int ret; + struct btrfs_key location; + struct btrfs_trans_handle *trans; + struct btrfs_fs_info *fs_info = root->fs_info; + struct extent_buffer *tmp; + + trans = btrfs_start_transaction(root, 1); + BUG_ON(!trans); + ret = btrfs_make_block_groups(trans, root); + if (ret) + goto err; + ret = btrfs_fix_block_accounting(trans, root); + if (ret) + goto err; + ret = create_chunk_mapping(trans, root); + if (ret) + goto err; + ret = btrfs_make_root_dir(trans, fs_info->tree_root, + BTRFS_ROOT_TREE_DIR_OBJECTID); + if (ret) + goto err; + memcpy(&location, &root->root_key, sizeof(location)); + location.offset = (u64)-1; + ret = btrfs_insert_dir_item(trans, fs_info->tree_root, "default", 7, + btrfs_super_root_dir(fs_info->super_copy), + &location, BTRFS_FT_DIR, 0); + if (ret) + goto err; + ret = btrfs_insert_inode_ref(trans, fs_info->tree_root, "default", 7, + location.objectid, + btrfs_super_root_dir(fs_info->super_copy), 0); + if (ret) + goto err; + btrfs_set_root_dirid(&fs_info->fs_root->root_item, + BTRFS_FIRST_FREE_OBJECTID); + + /* subvol for fs image file */ + ret = create_subvol(trans, root, CONV_IMAGE_SUBVOL_OBJECTID); + BUG_ON(ret); + /* subvol for data relocation */ + ret = create_subvol(trans, root, BTRFS_DATA_RELOC_TREE_OBJECTID); + BUG_ON(ret); + + extent_buffer_get(fs_info->csum_root->node); + ret = __btrfs_cow_block(trans, fs_info->csum_root, + fs_info->csum_root->node, NULL, 0, &tmp, 0, 0); + BUG_ON(ret); + free_extent_buffer(tmp); + + ret = btrfs_commit_transaction(trans, root); + BUG_ON(ret); +err: + return ret; +} + +/* + * Migrate super block to its default position and zero 0 ~ 16k + */ +static int migrate_super_block(int fd, u64 old_bytenr, u32 sectorsize) +{ + int ret; + struct extent_buffer *buf; + struct btrfs_super_block *super; + u32 len; + u32 bytenr; + + BUG_ON(sectorsize < sizeof(*super)); + buf = malloc(sizeof(*buf) + sectorsize); + if (!buf) + return -ENOMEM; + + buf->len = sectorsize; + ret = pread(fd, buf->data, sectorsize, old_bytenr); + if (ret != sectorsize) + goto fail; + + super = (struct btrfs_super_block *)buf->data; + BUG_ON(btrfs_super_bytenr(super) != old_bytenr); + btrfs_set_super_bytenr(super, BTRFS_SUPER_INFO_OFFSET); + + csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0); + ret = pwrite(fd, buf->data, sectorsize, BTRFS_SUPER_INFO_OFFSET); + if (ret != sectorsize) + goto fail; + + ret = fsync(fd); + if (ret) + goto fail; + + memset(buf->data, 0, sectorsize); + for (bytenr = 0; bytenr < BTRFS_SUPER_INFO_OFFSET; ) { + len = BTRFS_SUPER_INFO_OFFSET - bytenr; + if (len > sectorsize) + len = sectorsize; + ret = pwrite(fd, buf->data, len, bytenr); + if (ret != len) { + fprintf(stderr, "unable to zero fill device\n"); + break; + } + bytenr += len; + } + ret = 0; + fsync(fd); +fail: + free(buf); + if (ret > 0) + ret = -1; + return ret; +} + +static int prepare_system_chunk_sb(struct btrfs_super_block *super) +{ + struct btrfs_chunk *chunk; + struct btrfs_disk_key *key; + u32 sectorsize = btrfs_super_sectorsize(super); + + key = (struct btrfs_disk_key *)(super->sys_chunk_array); + chunk = (struct btrfs_chunk *)(super->sys_chunk_array + + sizeof(struct btrfs_disk_key)); + + btrfs_set_disk_key_objectid(key, BTRFS_FIRST_CHUNK_TREE_OBJECTID); + btrfs_set_disk_key_type(key, BTRFS_CHUNK_ITEM_KEY); + btrfs_set_disk_key_offset(key, 0); + + btrfs_set_stack_chunk_length(chunk, btrfs_super_total_bytes(super)); + btrfs_set_stack_chunk_owner(chunk, BTRFS_EXTENT_TREE_OBJECTID); + btrfs_set_stack_chunk_stripe_len(chunk, BTRFS_STRIPE_LEN); + btrfs_set_stack_chunk_type(chunk, BTRFS_BLOCK_GROUP_SYSTEM); + btrfs_set_stack_chunk_io_align(chunk, sectorsize); + btrfs_set_stack_chunk_io_width(chunk, sectorsize); + btrfs_set_stack_chunk_sector_size(chunk, sectorsize); + btrfs_set_stack_chunk_num_stripes(chunk, 1); + btrfs_set_stack_chunk_sub_stripes(chunk, 0); + chunk->stripe.devid = super->dev_item.devid; + btrfs_set_stack_stripe_offset(&chunk->stripe, 0); + memcpy(chunk->stripe.dev_uuid, super->dev_item.uuid, BTRFS_UUID_SIZE); + btrfs_set_super_sys_array_size(super, sizeof(*key) + sizeof(*chunk)); + return 0; +} + +static int prepare_system_chunk(int fd, u64 sb_bytenr) +{ + int ret; + struct extent_buffer *buf; + struct btrfs_super_block *super; + + BUG_ON(BTRFS_SUPER_INFO_SIZE < sizeof(*super)); + buf = malloc(sizeof(*buf) + BTRFS_SUPER_INFO_SIZE); + if (!buf) + return -ENOMEM; + + buf->len = BTRFS_SUPER_INFO_SIZE; + ret = pread(fd, buf->data, BTRFS_SUPER_INFO_SIZE, sb_bytenr); + if (ret != BTRFS_SUPER_INFO_SIZE) + goto fail; + + super = (struct btrfs_super_block *)buf->data; + BUG_ON(btrfs_super_bytenr(super) != sb_bytenr); + BUG_ON(btrfs_super_num_devices(super) != 1); + + ret = prepare_system_chunk_sb(super); + if (ret) + goto fail; + + csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0); + ret = pwrite(fd, buf->data, BTRFS_SUPER_INFO_SIZE, sb_bytenr); + if (ret != BTRFS_SUPER_INFO_SIZE) + goto fail; + + ret = 0; +fail: + free(buf); + if (ret > 0) + ret = -1; + return ret; +} + +static int relocate_one_reference(struct btrfs_trans_handle *trans, + struct btrfs_root *root, + u64 extent_start, u64 extent_size, + struct btrfs_key *extent_key, + struct extent_io_tree *reloc_tree) +{ + struct extent_buffer *leaf; + struct btrfs_file_extent_item *fi; + struct btrfs_key key; + struct btrfs_path path; + struct btrfs_inode_item inode; + struct blk_iterate_data data; + u64 bytenr; + u64 num_bytes; + u64 cur_offset; + u64 new_pos; + u64 nbytes; + u64 sector_end; + u32 sectorsize = root->sectorsize; + unsigned long ptr; + int datacsum; + int fd; + int ret; + + btrfs_init_path(&path); + ret = btrfs_search_slot(trans, root, extent_key, &path, -1, 1); + if (ret) + goto fail; + + leaf = path.nodes[0]; + fi = btrfs_item_ptr(leaf, path.slots[0], + struct btrfs_file_extent_item); + BUG_ON(btrfs_file_extent_offset(leaf, fi) > 0); + if (extent_start != btrfs_file_extent_disk_bytenr(leaf, fi) || + extent_size != btrfs_file_extent_disk_num_bytes(leaf, fi)) { + ret = 1; + goto fail; + } + + bytenr = extent_start + btrfs_file_extent_offset(leaf, fi); + num_bytes = btrfs_file_extent_num_bytes(leaf, fi); + + ret = btrfs_del_item(trans, root, &path); + if (ret) + goto fail; + + ret = btrfs_free_extent(trans, root, extent_start, extent_size, 0, + root->root_key.objectid, + extent_key->objectid, extent_key->offset); + if (ret) + goto fail; + + btrfs_release_path(&path); + + key.objectid = extent_key->objectid; + key.offset = 0; + key.type = BTRFS_INODE_ITEM_KEY; + ret = btrfs_lookup_inode(trans, root, &path, &key, 0); + if (ret) + goto fail; + + leaf = path.nodes[0]; + ptr = btrfs_item_ptr_offset(leaf, path.slots[0]); + read_extent_buffer(leaf, &inode, ptr, sizeof(inode)); + btrfs_release_path(&path); + + BUG_ON(num_bytes & (sectorsize - 1)); + nbytes = btrfs_stack_inode_nbytes(&inode) - num_bytes; + btrfs_set_stack_inode_nbytes(&inode, nbytes); + datacsum = !(btrfs_stack_inode_flags(&inode) & BTRFS_INODE_NODATASUM); + + init_blk_iterate_data(&data, trans, root, &inode, extent_key->objectid, + datacsum); + data.first_block = extent_key->offset; + + cur_offset = extent_key->offset; + while (num_bytes > 0) { + sector_end = bytenr + sectorsize - 1; + if (test_range_bit(reloc_tree, bytenr, sector_end, + EXTENT_LOCKED, 1)) { + ret = get_state_private(reloc_tree, bytenr, &new_pos); + BUG_ON(ret); + } else { + ret = custom_alloc_extent(root, sectorsize, 0, &key, 0); + if (ret) + goto fail; + new_pos = key.objectid; + + if (cur_offset == extent_key->offset) { + fd = root->fs_info->fs_devices->latest_bdev; + readahead(fd, bytenr, num_bytes); + } + ret = copy_disk_extent(root, new_pos, bytenr, + sectorsize); + if (ret) + goto fail; + ret = set_extent_bits(reloc_tree, bytenr, sector_end, + EXTENT_LOCKED, GFP_NOFS); + BUG_ON(ret); + ret = set_state_private(reloc_tree, bytenr, new_pos); + BUG_ON(ret); + } + + ret = block_iterate_proc(new_pos / sectorsize, + cur_offset / sectorsize, &data); + if (ret < 0) + goto fail; + + cur_offset += sectorsize; + bytenr += sectorsize; + num_bytes -= sectorsize; + } + + if (data.num_blocks > 0) { + ret = record_file_blocks(&data, data.first_block, + data.disk_block, data.num_blocks); + if (ret) + goto fail; + } + + key.objectid = extent_key->objectid; + key.offset = 0; + key.type = BTRFS_INODE_ITEM_KEY; + ret = btrfs_lookup_inode(trans, root, &path, &key, 1); + if (ret) + goto fail; + + leaf = path.nodes[0]; + ptr = btrfs_item_ptr_offset(leaf, path.slots[0]); + write_extent_buffer(leaf, &inode, ptr, sizeof(inode)); + btrfs_mark_buffer_dirty(leaf); + btrfs_release_path(&path); + +fail: + btrfs_release_path(&path); + return ret; +} + +static int relocate_extents_range(struct btrfs_root *fs_root, + struct btrfs_root *image_root, + u64 start_byte, u64 end_byte) +{ + struct btrfs_fs_info *info = fs_root->fs_info; + struct btrfs_root *extent_root = info->extent_root; + struct btrfs_root *cur_root = NULL; + struct btrfs_trans_handle *trans; + struct btrfs_extent_data_ref *dref; + struct btrfs_extent_inline_ref *iref; + struct btrfs_extent_item *ei; + struct extent_buffer *leaf; + struct btrfs_key key; + struct btrfs_key extent_key; + struct btrfs_path path; + struct extent_io_tree reloc_tree; + unsigned long ptr; + unsigned long end; + u64 cur_byte; + u64 num_bytes; + u64 ref_root; + u64 num_extents; + int pass = 0; + int ret; + + btrfs_init_path(&path); + extent_io_tree_init(&reloc_tree); + + key.objectid = start_byte; + key.offset = 0; + key.type = BTRFS_EXTENT_ITEM_KEY; + ret = btrfs_search_slot(NULL, extent_root, &key, &path, 0, 0); + if (ret < 0) + goto fail; + if (ret > 0) { + ret = btrfs_previous_item(extent_root, &path, 0, + BTRFS_EXTENT_ITEM_KEY); + if (ret < 0) + goto fail; + if (ret == 0) { + leaf = path.nodes[0]; + btrfs_item_key_to_cpu(leaf, &key, path.slots[0]); + if (key.objectid + key.offset > start_byte) + start_byte = key.objectid; + } + } + btrfs_release_path(&path); +again: + cur_root = (pass % 2 == 0) ? image_root : fs_root; + num_extents = 0; + + trans = btrfs_start_transaction(cur_root, 1); + BUG_ON(!trans); + + cur_byte = start_byte; + while (1) { + key.objectid = cur_byte; + key.offset = 0; + key.type = BTRFS_EXTENT_ITEM_KEY; + ret = btrfs_search_slot(trans, extent_root, + &key, &path, 0, 0); + if (ret < 0) + goto fail; +next: + leaf = path.nodes[0]; + if (path.slots[0] >= btrfs_header_nritems(leaf)) { + ret = btrfs_next_leaf(extent_root, &path); + if (ret < 0) + goto fail; + if (ret > 0) + break; + leaf = path.nodes[0]; + } + + btrfs_item_key_to_cpu(leaf, &key, path.slots[0]); + if (key.objectid < cur_byte || + key.type != BTRFS_EXTENT_ITEM_KEY) { + path.slots[0]++; + goto next; + } + if (key.objectid >= end_byte) + break; + + num_extents++; + + cur_byte = key.objectid; + num_bytes = key.offset; + ei = btrfs_item_ptr(leaf, path.slots[0], + struct btrfs_extent_item); + BUG_ON(!(btrfs_extent_flags(leaf, ei) & + BTRFS_EXTENT_FLAG_DATA)); + + ptr = btrfs_item_ptr_offset(leaf, path.slots[0]); + end = ptr + btrfs_item_size_nr(leaf, path.slots[0]); + + ptr += sizeof(struct btrfs_extent_item); + + while (ptr < end) { + iref = (struct btrfs_extent_inline_ref *)ptr; + key.type = btrfs_extent_inline_ref_type(leaf, iref); + BUG_ON(key.type != BTRFS_EXTENT_DATA_REF_KEY); + dref = (struct btrfs_extent_data_ref *)(&iref->offset); + ref_root = btrfs_extent_data_ref_root(leaf, dref); + extent_key.objectid = + btrfs_extent_data_ref_objectid(leaf, dref); + extent_key.offset = + btrfs_extent_data_ref_offset(leaf, dref); + extent_key.type = BTRFS_EXTENT_DATA_KEY; + BUG_ON(btrfs_extent_data_ref_count(leaf, dref) != 1); + + if (ref_root == cur_root->root_key.objectid) + break; + + ptr += btrfs_extent_inline_ref_size(key.type); + } + + if (ptr >= end) { + path.slots[0]++; + goto next; + } + + ret = relocate_one_reference(trans, cur_root, cur_byte, + num_bytes, &extent_key, + &reloc_tree); + if (ret < 0) + goto fail; + + cur_byte += num_bytes; + btrfs_release_path(&path); + + if (trans->blocks_used >= 4096) { + ret = btrfs_commit_transaction(trans, cur_root); + BUG_ON(ret); + trans = btrfs_start_transaction(cur_root, 1); + BUG_ON(!trans); + } + } + btrfs_release_path(&path); + + ret = btrfs_commit_transaction(trans, cur_root); + BUG_ON(ret); + + if (num_extents > 0 && pass++ < 16) + goto again; + + ret = (num_extents > 0) ? -1 : 0; +fail: + btrfs_release_path(&path); + extent_io_tree_cleanup(&reloc_tree); + return ret; +} + +/* + * relocate data in system chunk + */ +static int cleanup_sys_chunk(struct btrfs_root *fs_root, + struct btrfs_root *image_root) +{ + struct btrfs_block_group_cache *cache; + int i, ret = 0; + u64 offset = 0; + u64 end_byte; + + while(1) { + cache = btrfs_lookup_block_group(fs_root->fs_info, offset); + if (!cache) + break; + + end_byte = cache->key.objectid + cache->key.offset; + if (cache->flags & BTRFS_BLOCK_GROUP_SYSTEM) { + ret = relocate_extents_range(fs_root, image_root, + cache->key.objectid, + end_byte); + if (ret) + goto fail; + } + offset = end_byte; + } + for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) { + offset = btrfs_sb_offset(i); + offset &= ~((u64)BTRFS_STRIPE_LEN - 1); + + ret = relocate_extents_range(fs_root, image_root, + offset, offset + BTRFS_STRIPE_LEN); + if (ret) + goto fail; + } + ret = 0; +fail: + return ret; +} + +static int fixup_chunk_mapping(struct btrfs_root *root) +{ + struct btrfs_trans_handle *trans; + struct btrfs_fs_info *info = root->fs_info; + struct btrfs_root *chunk_root = info->chunk_root; + struct extent_buffer *leaf; + struct btrfs_key key; + struct btrfs_path path; + struct btrfs_chunk chunk; + unsigned long ptr; + u32 size; + u64 type; + int ret; + + btrfs_init_path(&path); + + trans = btrfs_start_transaction(root, 1); + BUG_ON(!trans); + + /* + * recow the whole chunk tree. this will move all chunk tree blocks + * into system block group. + */ + memset(&key, 0, sizeof(key)); + while (1) { + ret = btrfs_search_slot(trans, chunk_root, &key, &path, 0, 1); + if (ret < 0) + goto err; + + ret = btrfs_next_leaf(chunk_root, &path); + if (ret < 0) + goto err; + if (ret > 0) + break; + + btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]); + btrfs_release_path(&path); + } + btrfs_release_path(&path); + + /* fixup the system chunk array in super block */ + btrfs_set_super_sys_array_size(info->super_copy, 0); + + key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID; + key.offset = 0; + key.type = BTRFS_CHUNK_ITEM_KEY; + + ret = btrfs_search_slot(trans, chunk_root, &key, &path, 0, 0); + if (ret < 0) + goto err; + BUG_ON(ret != 0); + while(1) { + leaf = path.nodes[0]; + if (path.slots[0] >= btrfs_header_nritems(leaf)) { + ret = btrfs_next_leaf(chunk_root, &path); + if (ret < 0) + goto err; + if (ret > 0) + break; + leaf = path.nodes[0]; + } + btrfs_item_key_to_cpu(leaf, &key, path.slots[0]); + if (key.type != BTRFS_CHUNK_ITEM_KEY) + goto next; + + ptr = btrfs_item_ptr_offset(leaf, path.slots[0]); + size = btrfs_item_size_nr(leaf, path.slots[0]); + BUG_ON(size != sizeof(chunk)); + read_extent_buffer(leaf, &chunk, ptr, size); + type = btrfs_stack_chunk_type(&chunk); + + if (!(type & BTRFS_BLOCK_GROUP_SYSTEM)) + goto next; + + ret = btrfs_add_system_chunk(trans, chunk_root, &key, + &chunk, size); + if (ret) + goto err; +next: + path.slots[0]++; + } + + ret = btrfs_commit_transaction(trans, root); + BUG_ON(ret); +err: + btrfs_release_path(&path); + return ret; +} + +static const struct btrfs_convert_operations ext2_convert_ops = { + .name = "ext2", + .open_fs = ext2_open_fs, + .alloc_block = ext2_alloc_block, + .alloc_block_range = ext2_alloc_block_range, + .copy_inodes = ext2_copy_inodes, + .test_block = ext2_test_block, + .free_block = ext2_free_block, + .free_block_range = ext2_free_block_range, + .close_fs = ext2_close_fs, +}; + +static const struct btrfs_convert_operations *convert_operations[] = { + &ext2_convert_ops, +}; + +static int convert_open_fs(const char *devname, + struct btrfs_convert_context *cctx) +{ + int i; + + memset(cctx, 0, sizeof(*cctx)); + + for (i = 0; i < ARRAY_SIZE(convert_operations); i++) { + int ret = convert_operations[i]->open_fs(cctx, devname); + + if (ret == 0) { + cctx->convert_ops = convert_operations[i]; + return ret; + } + } + + fprintf(stderr, "No file system found to convert.\n"); + return -1; +} + +static int do_convert(const char *devname, int datacsum, int packing, int noxattr, + u32 nodesize, int copylabel, const char *fslabel, int progress, + u64 features) +{ + int i, ret, blocks_per_node; + int fd = -1; + int is_btrfs = 0; + u32 blocksize; + u64 blocks[7]; + u64 total_bytes; + u64 super_bytenr; + struct btrfs_root *root; + struct btrfs_root *image_root; + struct btrfs_convert_context cctx; + char *subvol_name = NULL; + struct task_ctx ctx; + char features_buf[64]; + struct btrfs_mkfs_config mkfs_cfg; + + init_convert_context(&cctx); + ret = convert_open_fs(devname, &cctx); + if (ret) + goto fail; + + blocksize = cctx.blocksize; + total_bytes = (u64)blocksize * (u64)cctx.block_count; + if (blocksize < 4096) { + fprintf(stderr, "block size is too small\n"); + goto fail; + } + if (btrfs_check_nodesize(nodesize, blocksize, features)) + goto fail; + blocks_per_node = nodesize / blocksize; + ret = -blocks_per_node; + for (i = 0; i < 7; i++) { + if (nodesize == blocksize) + ret = convert_alloc_block(&cctx, 0, blocks + i); + else + ret = convert_alloc_block_range(&cctx, + ret + blocks_per_node, blocks_per_node, + blocks + i); + if (ret) { + fprintf(stderr, "not enough free space\n"); + goto fail; + } + blocks[i] *= blocksize; + } + super_bytenr = blocks[0]; + fd = open(devname, O_RDWR); + if (fd < 0) { + fprintf(stderr, "unable to open %s\n", devname); + goto fail; + } + btrfs_parse_features_to_string(features_buf, features); + if (features == BTRFS_MKFS_DEFAULT_FEATURES) + strcat(features_buf, " (default)"); + + printf("create btrfs filesystem:\n"); + printf("\tblocksize: %u\n", blocksize); + printf("\tnodesize: %u\n", nodesize); + printf("\tfeatures: %s\n", features_buf); + + mkfs_cfg.label = cctx.volume_name; + mkfs_cfg.fs_uuid = NULL; + memcpy(mkfs_cfg.blocks, blocks, sizeof(blocks)); + mkfs_cfg.num_bytes = total_bytes; + mkfs_cfg.nodesize = nodesize; + mkfs_cfg.sectorsize = blocksize; + mkfs_cfg.stripesize = blocksize; + mkfs_cfg.features = features; + + ret = make_btrfs(fd, &mkfs_cfg); + if (ret) { + fprintf(stderr, "unable to create initial ctree: %s\n", + strerror(-ret)); + goto fail; + } + /* create a system chunk that maps the whole device */ + ret = prepare_system_chunk(fd, super_bytenr); + if (ret) { + fprintf(stderr, "unable to update system chunk\n"); + goto fail; + } + root = open_ctree_fd(fd, devname, super_bytenr, OPEN_CTREE_WRITES); + if (!root) { + fprintf(stderr, "unable to open ctree\n"); + goto fail; + } + ret = cache_free_extents(root, &cctx); + if (ret) { + fprintf(stderr, "error during cache_free_extents %d\n", ret); + goto fail; + } + root->fs_info->extent_ops = &extent_ops; + /* recover block allocation bitmap */ + for (i = 0; i < 7; i++) { + blocks[i] /= blocksize; + if (nodesize == blocksize) + convert_free_block(&cctx, blocks[i]); + else + convert_free_block_range(&cctx, blocks[i], + blocks_per_node); + } + ret = init_btrfs(root); + if (ret) { + fprintf(stderr, "unable to setup the root tree\n"); + goto fail; + } + printf("creating btrfs metadata.\n"); + ctx.max_copy_inodes = (cctx.inodes_count - cctx.free_inodes_count); + ctx.cur_copy_inodes = 0; + + if (progress) { + ctx.info = task_init(print_copied_inodes, after_copied_inodes, &ctx); + task_start(ctx.info); + } + ret = copy_inodes(&cctx, root, datacsum, packing, noxattr, &ctx); + if (ret) { + fprintf(stderr, "error during copy_inodes %d\n", ret); + goto fail; + } + if (progress) { + task_stop(ctx.info); + task_deinit(ctx.info); + } + + printf("creating %s image file.\n", cctx.convert_ops->name); + ret = asprintf(&subvol_name, "%s_saved", cctx.convert_ops->name); + if (ret < 0) { + fprintf(stderr, "error allocating subvolume name: %s_saved\n", + cctx.convert_ops->name); + goto fail; + } + + image_root = link_subvol(root, subvol_name, CONV_IMAGE_SUBVOL_OBJECTID); + + free(subvol_name); + + if (!image_root) { + fprintf(stderr, "unable to create subvol\n"); + goto fail; + } + ret = create_image(&cctx, image_root, "image", datacsum); + if (ret) { + fprintf(stderr, "error during create_image %d\n", ret); + goto fail; + } + memset(root->fs_info->super_copy->label, 0, BTRFS_LABEL_SIZE); + if (copylabel == 1) { + strncpy(root->fs_info->super_copy->label, + cctx.volume_name, BTRFS_LABEL_SIZE); + fprintf(stderr, "copy label '%s'\n", + root->fs_info->super_copy->label); + } else if (copylabel == -1) { + strcpy(root->fs_info->super_copy->label, fslabel); + fprintf(stderr, "set label to '%s'\n", fslabel); + } + + printf("cleaning up system chunk.\n"); + ret = cleanup_sys_chunk(root, image_root); + if (ret) { + fprintf(stderr, "error during cleanup_sys_chunk %d\n", ret); + goto fail; + } + ret = close_ctree(root); + if (ret) { + fprintf(stderr, "error during close_ctree %d\n", ret); + goto fail; + } + convert_close_fs(&cctx); + clean_convert_context(&cctx); + + /* + * If this step succeed, we get a mountable btrfs. Otherwise + * the source fs is left unchanged. + */ + ret = migrate_super_block(fd, super_bytenr, blocksize); + if (ret) { + fprintf(stderr, "unable to migrate super block\n"); + goto fail; + } + is_btrfs = 1; + + root = open_ctree_fd(fd, devname, 0, OPEN_CTREE_WRITES); + if (!root) { + fprintf(stderr, "unable to open ctree\n"); + goto fail; + } + /* move chunk tree into system chunk. */ + ret = fixup_chunk_mapping(root); + if (ret) { + fprintf(stderr, "error during fixup_chunk_tree\n"); + goto fail; + } + ret = close_ctree(root); + close(fd); + + printf("conversion complete.\n"); + return 0; +fail: + clean_convert_context(&cctx); + if (fd != -1) + close(fd); + if (is_btrfs) + fprintf(stderr, + "WARNING: an error occured during chunk mapping fixup, filesystem mountable but not finalized\n"); + else + fprintf(stderr, "conversion aborted\n"); + return -1; +} + +static int may_rollback(struct btrfs_root *root) +{ + struct btrfs_fs_info *info = root->fs_info; + struct btrfs_multi_bio *multi = NULL; + u64 bytenr; + u64 length; + u64 physical; + u64 total_bytes; + int num_stripes; + int ret; + + if (btrfs_super_num_devices(info->super_copy) != 1) + goto fail; + + bytenr = BTRFS_SUPER_INFO_OFFSET; + total_bytes = btrfs_super_total_bytes(root->fs_info->super_copy); + + while (1) { + ret = btrfs_map_block(&info->mapping_tree, WRITE, bytenr, + &length, &multi, 0, NULL); + if (ret) { + if (ret == -ENOENT) { + /* removed block group at the tail */ + if (length == (u64)-1) + break; + + /* removed block group in the middle */ + goto next; + } + goto fail; + } + + num_stripes = multi->num_stripes; + physical = multi->stripes[0].physical; + kfree(multi); + + if (num_stripes != 1 || physical != bytenr) + goto fail; +next: + bytenr += length; + if (bytenr >= total_bytes) + break; + } + return 0; +fail: + return -1; +} + +static int do_rollback(const char *devname) +{ + int fd = -1; + int ret; + int i; + struct btrfs_root *root; + struct btrfs_root *image_root; + struct btrfs_root *chunk_root; + struct btrfs_dir_item *dir; + struct btrfs_inode_item *inode; + struct btrfs_file_extent_item *fi; + struct btrfs_trans_handle *trans; + struct extent_buffer *leaf; + struct btrfs_block_group_cache *cache1; + struct btrfs_block_group_cache *cache2; + struct btrfs_key key; + struct btrfs_path path; + struct extent_io_tree io_tree; + char *buf = NULL; + char *name; + u64 bytenr; + u64 num_bytes; + u64 root_dir; + u64 objectid; + u64 offset; + u64 start; + u64 end; + u64 sb_bytenr; + u64 first_free; + u64 total_bytes; + u32 sectorsize; + + extent_io_tree_init(&io_tree); + + fd = open(devname, O_RDWR); + if (fd < 0) { + fprintf(stderr, "unable to open %s\n", devname); + goto fail; + } + root = open_ctree_fd(fd, devname, 0, OPEN_CTREE_WRITES); + if (!root) { + fprintf(stderr, "unable to open ctree\n"); + goto fail; + } + ret = may_rollback(root); + if (ret < 0) { + fprintf(stderr, "unable to do rollback\n"); + goto fail; + } + + sectorsize = root->sectorsize; + buf = malloc(sectorsize); + if (!buf) { + fprintf(stderr, "unable to allocate memory\n"); + goto fail; + } + + btrfs_init_path(&path); + + key.objectid = CONV_IMAGE_SUBVOL_OBJECTID; + key.type = BTRFS_ROOT_BACKREF_KEY; + key.offset = BTRFS_FS_TREE_OBJECTID; + ret = btrfs_search_slot(NULL, root->fs_info->tree_root, &key, &path, 0, + 0); + btrfs_release_path(&path); + if (ret > 0) { + fprintf(stderr, + "ERROR: unable to convert ext2 image subvolume, is it deleted?\n"); + goto fail; + } else if (ret < 0) { + fprintf(stderr, + "ERROR: unable to open ext2_subvol, id=%llu: %s\n", + (unsigned long long)key.objectid, strerror(-ret)); + goto fail; + } + + key.objectid = CONV_IMAGE_SUBVOL_OBJECTID; + key.type = BTRFS_ROOT_ITEM_KEY; + key.offset = (u64)-1; + image_root = btrfs_read_fs_root(root->fs_info, &key); + if (!image_root || IS_ERR(image_root)) { + fprintf(stderr, "unable to open subvol %llu\n", + (unsigned long long)key.objectid); + goto fail; + } + + name = "image"; + root_dir = btrfs_root_dirid(&root->root_item); + dir = btrfs_lookup_dir_item(NULL, image_root, &path, + root_dir, name, strlen(name), 0); + if (!dir || IS_ERR(dir)) { + fprintf(stderr, "unable to find file %s\n", name); + goto fail; + } + leaf = path.nodes[0]; + btrfs_dir_item_key_to_cpu(leaf, dir, &key); + btrfs_release_path(&path); + + objectid = key.objectid; + + ret = btrfs_lookup_inode(NULL, image_root, &path, &key, 0); + if (ret) { + fprintf(stderr, "unable to find inode item\n"); + goto fail; + } + leaf = path.nodes[0]; + inode = btrfs_item_ptr(leaf, path.slots[0], struct btrfs_inode_item); + total_bytes = btrfs_inode_size(leaf, inode); + btrfs_release_path(&path); + + key.objectid = objectid; + key.offset = 0; + btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY); + ret = btrfs_search_slot(NULL, image_root, &key, &path, 0, 0); + if (ret != 0) { + fprintf(stderr, "unable to find first file extent\n"); + btrfs_release_path(&path); + goto fail; + } + + /* build mapping tree for the relocated blocks */ + for (offset = 0; offset < total_bytes; ) { + leaf = path.nodes[0]; + if (path.slots[0] >= btrfs_header_nritems(leaf)) { + ret = btrfs_next_leaf(root, &path); + if (ret != 0) + break; + continue; + } + + btrfs_item_key_to_cpu(leaf, &key, path.slots[0]); + if (key.objectid != objectid || key.offset != offset || + btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) + break; + + fi = btrfs_item_ptr(leaf, path.slots[0], + struct btrfs_file_extent_item); + if (btrfs_file_extent_type(leaf, fi) != BTRFS_FILE_EXTENT_REG) + break; + if (btrfs_file_extent_compression(leaf, fi) || + btrfs_file_extent_encryption(leaf, fi) || + btrfs_file_extent_other_encoding(leaf, fi)) + break; + + bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); + /* skip holes and direct mapped extents */ + if (bytenr == 0 || bytenr == offset) + goto next_extent; + + bytenr += btrfs_file_extent_offset(leaf, fi); + num_bytes = btrfs_file_extent_num_bytes(leaf, fi); + + cache1 = btrfs_lookup_block_group(root->fs_info, offset); + cache2 = btrfs_lookup_block_group(root->fs_info, + offset + num_bytes - 1); + if (!cache1 || cache1 != cache2 || + (!(cache1->flags & BTRFS_BLOCK_GROUP_SYSTEM) && + !intersect_with_sb(offset, num_bytes))) + break; + + set_extent_bits(&io_tree, offset, offset + num_bytes - 1, + EXTENT_LOCKED, GFP_NOFS); + set_state_private(&io_tree, offset, bytenr); +next_extent: + offset += btrfs_file_extent_num_bytes(leaf, fi); + path.slots[0]++; + } + btrfs_release_path(&path); + + if (offset < total_bytes) { + fprintf(stderr, "unable to build extent mapping\n"); + goto fail; + } + + first_free = BTRFS_SUPER_INFO_OFFSET + 2 * sectorsize - 1; + first_free &= ~((u64)sectorsize - 1); + /* backup for extent #0 should exist */ + if(!test_range_bit(&io_tree, 0, first_free - 1, EXTENT_LOCKED, 1)) { + fprintf(stderr, "no backup for the first extent\n"); + goto fail; + } + /* force no allocation from system block group */ + root->fs_info->system_allocs = -1; + trans = btrfs_start_transaction(root, 1); + BUG_ON(!trans); + /* + * recow the whole chunk tree, this will remove all chunk tree blocks + * from system block group + */ + chunk_root = root->fs_info->chunk_root; + memset(&key, 0, sizeof(key)); + while (1) { + ret = btrfs_search_slot(trans, chunk_root, &key, &path, 0, 1); + if (ret < 0) + break; + + ret = btrfs_next_leaf(chunk_root, &path); + if (ret) + break; + + btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]); + btrfs_release_path(&path); + } + btrfs_release_path(&path); + + offset = 0; + num_bytes = 0; + while(1) { + cache1 = btrfs_lookup_block_group(root->fs_info, offset); + if (!cache1) + break; + + if (cache1->flags & BTRFS_BLOCK_GROUP_SYSTEM) + num_bytes += btrfs_block_group_used(&cache1->item); + + offset = cache1->key.objectid + cache1->key.offset; + } + /* only extent #0 left in system block group? */ + if (num_bytes > first_free) { + fprintf(stderr, "unable to empty system block group\n"); + goto fail; + } + /* create a system chunk that maps the whole device */ + ret = prepare_system_chunk_sb(root->fs_info->super_copy); + if (ret) { + fprintf(stderr, "unable to update system chunk\n"); + goto fail; + } + + ret = btrfs_commit_transaction(trans, root); + BUG_ON(ret); + + ret = close_ctree(root); + if (ret) { + fprintf(stderr, "error during close_ctree %d\n", ret); + goto fail; + } + + /* zero btrfs super block mirrors */ + memset(buf, 0, sectorsize); + for (i = 1 ; i < BTRFS_SUPER_MIRROR_MAX; i++) { + bytenr = btrfs_sb_offset(i); + if (bytenr >= total_bytes) + break; + ret = pwrite(fd, buf, sectorsize, bytenr); + if (ret != sectorsize) { + fprintf(stderr, + "error during zeroing supreblock %d: %d\n", + i, ret); + goto fail; + } + } + + sb_bytenr = (u64)-1; + /* copy all relocated blocks back */ + while(1) { + ret = find_first_extent_bit(&io_tree, 0, &start, &end, + EXTENT_LOCKED); + if (ret) + break; + + ret = get_state_private(&io_tree, start, &bytenr); + BUG_ON(ret); + + clear_extent_bits(&io_tree, start, end, EXTENT_LOCKED, + GFP_NOFS); + + while (start <= end) { + if (start == BTRFS_SUPER_INFO_OFFSET) { + sb_bytenr = bytenr; + goto next_sector; + } + ret = pread(fd, buf, sectorsize, bytenr); + if (ret < 0) { + fprintf(stderr, "error during pread %d\n", ret); + goto fail; + } + BUG_ON(ret != sectorsize); + ret = pwrite(fd, buf, sectorsize, start); + if (ret < 0) { + fprintf(stderr, "error during pwrite %d\n", ret); + goto fail; + } + BUG_ON(ret != sectorsize); +next_sector: + start += sectorsize; + bytenr += sectorsize; + } + } + + ret = fsync(fd); + if (ret) { + fprintf(stderr, "error during fsync %d\n", ret); + goto fail; + } + /* + * finally, overwrite btrfs super block. + */ + ret = pread(fd, buf, sectorsize, sb_bytenr); + if (ret < 0) { + fprintf(stderr, "error during pread %d\n", ret); + goto fail; + } + BUG_ON(ret != sectorsize); + ret = pwrite(fd, buf, sectorsize, BTRFS_SUPER_INFO_OFFSET); + if (ret < 0) { + fprintf(stderr, "error during pwrite %d\n", ret); + goto fail; + } + BUG_ON(ret != sectorsize); + ret = fsync(fd); + if (ret) { + fprintf(stderr, "error during fsync %d\n", ret); + goto fail; + } + + close(fd); + free(buf); + extent_io_tree_cleanup(&io_tree); + printf("rollback complete.\n"); + return 0; + +fail: + if (fd != -1) + close(fd); + free(buf); + fprintf(stderr, "rollback aborted.\n"); + return -1; +} + +static void print_usage(void) +{ + printf("usage: btrfs-convert [options] device\n"); + printf("options:\n"); + printf("\t-d|--no-datasum disable data checksum, sets NODATASUM\n"); + printf("\t-i|--no-xattr ignore xattrs and ACLs\n"); + printf("\t-n|--no-inline disable inlining of small files to metadata\n"); + printf("\t-N|--nodesize SIZE set filesystem metadata nodesize\n"); + printf("\t-r|--rollback roll back to the original filesystem\n"); + printf("\t-l|--label LABEL set filesystem label\n"); + printf("\t-L|--copy-label use label from converted filesystem\n"); + printf("\t-p|--progress show converting progress (default)\n"); + printf("\t-O|--features LIST comma separated list of filesystem features\n"); + printf("\t--no-progress show only overview, not the detailed progress\n"); +} + +int main(int argc, char *argv[]) +{ + int ret; + int packing = 1; + int noxattr = 0; + int datacsum = 1; + u32 nodesize = max_t(u32, sysconf(_SC_PAGESIZE), + BTRFS_MKFS_DEFAULT_NODE_SIZE); + int rollback = 0; + int copylabel = 0; + int usage_error = 0; + int progress = 1; + char *file; + char fslabel[BTRFS_LABEL_SIZE]; + u64 features = BTRFS_MKFS_DEFAULT_FEATURES; + + while(1) { + enum { GETOPT_VAL_NO_PROGRESS = 256 }; + static const struct option long_options[] = { + { "no-progress", no_argument, NULL, + GETOPT_VAL_NO_PROGRESS }, + { "no-datasum", no_argument, NULL, 'd' }, + { "no-inline", no_argument, NULL, 'n' }, + { "no-xattr", no_argument, NULL, 'i' }, + { "rollback", no_argument, NULL, 'r' }, + { "features", required_argument, NULL, 'O' }, + { "progress", no_argument, NULL, 'p' }, + { "label", required_argument, NULL, 'l' }, + { "copy-label", no_argument, NULL, 'L' }, + { "nodesize", required_argument, NULL, 'N' }, + { "help", no_argument, NULL, GETOPT_VAL_HELP}, + { NULL, 0, NULL, 0 } + }; + int c = getopt_long(argc, argv, "dinN:rl:LpO:", long_options, NULL); + + if (c < 0) + break; + switch(c) { + case 'd': + datacsum = 0; + break; + case 'i': + noxattr = 1; + break; + case 'n': + packing = 0; + break; + case 'N': + nodesize = parse_size(optarg); + break; + case 'r': + rollback = 1; + break; + case 'l': + copylabel = -1; + if (strlen(optarg) >= BTRFS_LABEL_SIZE) { + fprintf(stderr, + "WARNING: label too long, trimmed to %d bytes\n", + BTRFS_LABEL_SIZE - 1); + } + strncpy(fslabel, optarg, BTRFS_LABEL_SIZE - 1); + fslabel[BTRFS_LABEL_SIZE - 1] = 0; + break; + case 'L': + copylabel = 1; + break; + case 'p': + progress = 1; + break; + case 'O': { + char *orig = strdup(optarg); + char *tmp = orig; + + tmp = btrfs_parse_fs_features(tmp, &features); + if (tmp) { + fprintf(stderr, + "Unrecognized filesystem feature '%s'\n", + tmp); + free(orig); + exit(1); + } + free(orig); + if (features & BTRFS_FEATURE_LIST_ALL) { + btrfs_list_all_fs_features( + ~BTRFS_CONVERT_ALLOWED_FEATURES); + exit(0); + } + if (features & ~BTRFS_CONVERT_ALLOWED_FEATURES) { + char buf[64]; + + btrfs_parse_features_to_string(buf, + features & ~BTRFS_CONVERT_ALLOWED_FEATURES); + fprintf(stderr, + "ERROR: features not allowed for convert: %s\n", + buf); + exit(1); + } + + break; + } + case GETOPT_VAL_NO_PROGRESS: + progress = 0; + break; + case GETOPT_VAL_HELP: + default: + print_usage(); + return c != GETOPT_VAL_HELP; + } + } + argc = argc - optind; + set_argv0(argv); + if (check_argc_exact(argc, 1)) { + print_usage(); + return 1; + } + + if (rollback && (!datacsum || noxattr || !packing)) { + fprintf(stderr, + "Usage error: -d, -i, -n options do not apply to rollback\n"); + usage_error++; + } + + if (usage_error) { + print_usage(); + return 1; + } + + file = argv[optind]; + ret = check_mounted(file); + if (ret < 0) { + fprintf(stderr, "Could not check mount status: %s\n", + strerror(-ret)); + return 1; + } else if (ret) { + fprintf(stderr, "%s is mounted\n", file); + return 1; + } + + if (rollback) { + ret = do_rollback(file); + } else { + ret = do_convert(file, datacsum, packing, noxattr, nodesize, + copylabel, fslabel, progress, features); + } + if (ret) + return 1; + return 0; +} |