1 files changed, 976 insertions, 0 deletions

diff --git a/convert/source-reiserfs.c b/convert/source-reiserfs.c
new file mode 100644
index 00000000..be79d8e2
--- /dev/null
+++ b/convert/source-reiserfs.c
@@ -0,0 +1,976 @@
+/*
+ * 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.
+ */
+
+#if BTRFSCONVERT_REISERFS
+
+#include "kerncompat.h"
+#include <linux/limits.h>
+#include <linux/fs.h>
+#include <limits.h>
+#include <sys/stat.h>
+#include <stdbool.h>
+#include "disk-io.h"
+#include "transaction.h"
+#include "utils.h"
+#include "bitops.h"
+#include "convert/common.h"
+#include "convert/source-reiserfs.h"
+
+static inline u8 mode_to_file_type(u32 mode)
+{
+	switch (mode & S_IFMT) {
+	case S_IFREG:	return BTRFS_FT_REG_FILE;
+	case S_IFDIR:	return BTRFS_FT_DIR;
+	case S_IFCHR:	return BTRFS_FT_CHRDEV;
+	case S_IFBLK:	return BTRFS_FT_BLKDEV;
+	case S_IFIFO:	return BTRFS_FT_FIFO;
+	case S_IFSOCK:	return BTRFS_FT_SOCK;
+	case S_IFLNK:	return BTRFS_FT_SYMLINK;
+	};
+
+	return BTRFS_FT_UNKNOWN;
+}
+
+static u32 reiserfs_count_objectids(reiserfs_filsys_t fs)
+{
+	struct reiserfs_super_block *sb = fs->fs_ondisk_sb;
+	u32 count = 0;
+	u32 *map;
+	int i;
+
+	if (fs->fs_format == REISERFS_FORMAT_3_6)
+		map = (u32 *) (sb + 1);
+	else
+		map = (u32 *)((struct reiserfs_super_block_v1 *)sb + 1);
+
+	for (i = 0; i < get_sb_oid_cursize(sb); i += 2)
+		count += le32_to_cpu(map[i + 1]) - (le32_to_cpu(map[i]) + 1);
+
+	return count;
+}
+
+
+static int reiserfs_open_fs(struct btrfs_convert_context *cxt, const char *name)
+{
+	struct reiserfs_convert_info *info;
+	reiserfs_filsys_t fs;
+	long error;
+
+	fs = reiserfs_open(name, O_RDONLY, &error, NULL, 0);
+	if (!fs)
+		return -1;
+
+	error = reiserfs_open_ondisk_bitmap(fs);
+	if (error) {
+		reiserfs_close(fs);
+		return -1;
+	}
+
+	cxt->fs_data = fs;
+	cxt->blocksize = fs->fs_blocksize;
+	cxt->block_count = get_sb_block_count(fs->fs_ondisk_sb);
+	cxt->total_bytes = cxt->blocksize * cxt->block_count;
+	cxt->volume_name = strndup(fs->fs_ondisk_sb->s_label, 16);
+	cxt->first_data_block = 0;
+	cxt->inodes_count = reiserfs_count_objectids(fs);
+	cxt->free_inodes_count = 0;
+	info = calloc(1, sizeof(*info));
+	if (!info) {
+		reiserfs_close(fs);
+		return -1;
+	}
+
+	/*
+	 * Inode attributes are somewhat of a hack on reiserfs and it was
+	 * once possible to have garbage in the flags field.  A superblock
+	 * field now indicates that the field has been cleared and can
+	 * be considered valid, but only on v3.6 format file systems.
+	 */
+	if (fs->fs_format == REISERFS_FORMAT_3_6 &&
+	    get_sb_v2_flag(fs->fs_ondisk_sb, reiserfs_attrs_cleared))
+		info->copy_attrs = true;
+
+	fs->fs_vp = info;
+	return 0;
+}
+
+static void reiserfs_close_fs(struct btrfs_convert_context *cxt)
+{
+	reiserfs_filsys_t fs = cxt->fs_data;
+	struct reiserfs_convert_info *info = fs->fs_vp;
+
+	if (info) {
+		if (info->objectids)
+			free(info->objectids);
+		free(info);
+		fs->fs_vp = NULL;
+	}
+
+	/* We don't want changes to be persistent */
+	fs->fs_bitmap2->bm_dirty = 0;
+
+	reiserfs_close(fs);
+}
+
+static int compare_objectids(const void *p1, const void *p2)
+{
+	u64 v1 = *(u64 *)p1;
+	u64 v2 = *(u64 *)p2;
+
+	if (v1 > v2)
+		return 1;
+	else if (v1 < v2)
+		return -1;
+	return 0;
+}
+
+static int lookup_cached_objectid(reiserfs_filsys_t fs, u64 objectid)
+{
+	struct reiserfs_convert_info *info = fs->fs_vp;
+	u64 *result;
+
+	if (!info->objectids)
+		return 0;
+	result = bsearch(&objectid, info->objectids, info->used_slots,
+			 sizeof(u64), compare_objectids);
+	return result != NULL;
+}
+
+static int insert_cached_objectid(reiserfs_filsys_t fs, u64 objectid)
+{
+	struct reiserfs_convert_info *info = fs->fs_vp;
+
+	if (info->used_slots + 1 >= info->alloced_slots) {
+		u64 *objectids = realloc(info->objectids,
+				    (info->alloced_slots + 1000) * sizeof(u64));
+
+		if (!objectids)
+			return -ENOMEM;
+		info->objectids = objectids;
+		info->alloced_slots += 1000;
+	}
+	info->objectids[info->used_slots++] = objectid;
+
+	qsort(info->objectids, info->used_slots, sizeof(u64), compare_objectids);
+	return 0;
+}
+
+static int reiserfs_locate_privroot(reiserfs_filsys_t fs)
+{
+	int err;
+	unsigned generation;
+	struct reiserfs_convert_info *info = fs->fs_vp;
+	struct reiserfs_key key = root_dir_key;
+
+	err = reiserfs_find_entry(fs, &key, ".reiserfs_priv",
+				  &generation, &info->privroot_key);
+	if (err == 1) {
+		err = reiserfs_find_entry(fs, &info->privroot_key, "xattrs",
+					  &generation, &info->xattr_key);
+		if (err != 1)
+			memset(&info->xattr_key, 0, sizeof(info->xattr_key));
+	}
+
+	return 0;
+}
+
+static void reiserfs_convert_inode_flags(struct btrfs_inode_item *inode,
+					 const struct stat_data *sd)
+{
+	u16 attrs = sd_v2_sd_attrs(sd);
+	u64 new_flags = 0;
+
+	if (attrs & FS_IMMUTABLE_FL)
+		new_flags |= BTRFS_INODE_IMMUTABLE;
+
+	if (attrs & FS_APPEND_FL)
+		new_flags |= BTRFS_INODE_APPEND;
+
+	if (attrs & FS_SYNC_FL)
+		new_flags |= BTRFS_INODE_SYNC;
+
+	if (attrs & FS_NOATIME_FL)
+		new_flags |= BTRFS_INODE_NOATIME;
+
+	if (attrs & FS_NODUMP_FL)
+		new_flags |= BTRFS_INODE_NODUMP;
+
+	if (attrs & FS_NODUMP_FL)
+		new_flags |= BTRFS_INODE_NODUMP;
+
+	btrfs_set_stack_inode_flags(inode, new_flags);
+
+}
+
+static void reiserfs_copy_inode_item(struct btrfs_inode_item *inode,
+				     struct item_head *ih, void *stat_data,
+				     bool copy_inode_flags)
+{
+	u32 mode;
+	u32 rdev = 0;
+
+	memset(inode, 0, sizeof(*inode));
+	btrfs_set_stack_inode_generation(inode, 1);
+	if (get_ih_key_format(ih) == KEY_FORMAT_1) {
+		struct stat_data_v1 *sd = stat_data;
+
+		mode = sd_v1_mode(sd);
+		btrfs_set_stack_inode_size(inode, sd_v1_size(sd));
+		btrfs_set_stack_inode_nlink(inode, sd_v1_nlink(sd));
+		btrfs_set_stack_inode_uid(inode, sd_v1_uid(sd));
+		btrfs_set_stack_inode_gid(inode, sd_v1_gid(sd));
+		btrfs_set_stack_timespec_sec(&inode->atime, sd_v1_atime(sd));
+		btrfs_set_stack_timespec_sec(&inode->ctime, sd_v1_ctime(sd));
+		btrfs_set_stack_timespec_sec(&inode->mtime, sd_v1_mtime(sd));
+
+		if (!S_ISREG(mode) && !S_ISDIR(mode) && !S_ISLNK(mode))
+			rdev = decode_dev(sd_v1_rdev(sd));
+	} else {
+		struct stat_data *sd = stat_data;
+
+		mode = sd_v2_mode(sd);
+		btrfs_set_stack_inode_size(inode, sd_v2_size(sd));
+		btrfs_set_stack_inode_nlink(inode, sd_v2_nlink(sd));
+		btrfs_set_stack_inode_uid(inode, sd_v2_uid(sd));
+		btrfs_set_stack_inode_gid(inode, sd_v2_gid(sd));
+		btrfs_set_stack_timespec_sec(&inode->atime, sd_v2_atime(sd));
+		btrfs_set_stack_timespec_sec(&inode->ctime, sd_v2_ctime(sd));
+		btrfs_set_stack_timespec_sec(&inode->mtime, sd_v2_mtime(sd));
+
+		if (!S_ISREG(mode) && !S_ISDIR(mode) && !S_ISLNK(mode))
+			rdev = decode_dev(sd_v2_rdev(sd));
+
+		if (copy_inode_flags)
+			reiserfs_convert_inode_flags(inode, sd);
+
+	}
+	if (S_ISDIR(mode)) {
+		btrfs_set_stack_inode_size(inode, 0);
+		btrfs_set_stack_inode_nlink(inode, 1);
+	}
+	btrfs_set_stack_inode_mode(inode, mode);
+	btrfs_set_stack_inode_rdev(inode, rdev);
+}
+
+static void init_reiserfs_blk_iterate_data(
+				struct reiserfs_blk_iterate_data *data,
+				struct btrfs_trans_handle *trans,
+				struct btrfs_root *root,
+				struct btrfs_inode_item *inode,
+				u64 objectid, u32 convert_flags)
+{
+	init_blk_iterate_data(&data->blk_data, trans, root, inode, objectid,
+			      convert_flags & CONVERT_FLAG_DATACSUM);
+	data->inline_data = NULL;
+	data->inline_offset = (u64)-1;
+	data->inline_length = 0;
+}
+
+static int reiserfs_record_indirect_extent(reiserfs_filsys_t fs, u64 position,
+					   u64 size, int num_ptrs,
+					   u32 *ptrs, void *data)
+{
+	struct reiserfs_blk_iterate_data *bdata = data;
+	u32 file_block = position / fs->fs_blocksize;
+	int i;
+	int ret = 0;
+
+	for (i = 0; i < num_ptrs; i++, file_block++) {
+		u32 block = d32_get(ptrs, i);
+
+		ret = block_iterate_proc(block, file_block, &bdata->blk_data);
+		if (ret)
+			break;
+	}
+
+	return ret;
+}
+
+/*
+ * Unlike btrfs inline extents, reiserfs can have multiple inline extents.
+ * This handles concatanating multiple tails into one inline extent
+ * for insertion.
+ */
+static int reiserfs_record_direct_extent(reiserfs_filsys_t fs, __u64 position,
+					 __u64 size, const char *body,
+					 size_t len, void *data)
+{
+	struct reiserfs_blk_iterate_data *bdata = data;
+	char *inline_data;
+
+	if (bdata->inline_offset == (u64)-1)
+		bdata->inline_offset = position;
+	else if (bdata->inline_offset + bdata->inline_length != position) {
+		/*
+		 * This condition shouldn't actually happen, but better to
+		 * catch it than break silently.
+		 */
+		error(
+"source fs contains file with multiple tails but they are not contiguous");
+		return -EINVAL;
+	}
+
+	inline_data = realloc(bdata->inline_data, bdata->inline_length + len);
+	if (!inline_data)
+		return -ENOMEM;
+
+	bdata->inline_data = inline_data;
+	memcpy(bdata->inline_data + bdata->inline_length, body, len);
+	bdata->inline_length += len;
+
+	return 0;
+}
+
+static int convert_direct(struct btrfs_trans_handle *trans,
+			  struct btrfs_root *root, u64 objectid,
+			  struct btrfs_inode_item *inode, const char *body,
+			  u32 length, u64 offset, u32 convert_flags)
+{
+	struct btrfs_key key;
+	u32 sectorsize = root->fs_info->sectorsize;
+	int ret;
+	struct extent_buffer *eb;
+
+	BUG_ON(length > sectorsize);
+	ret = btrfs_reserve_extent(trans, root, sectorsize,
+				   0, 0, -1ULL, &key, 1);
+	if (ret)
+		return ret;
+
+	eb = alloc_extent_buffer(&root->fs_info->extent_cache, key.objectid,
+				 sectorsize);
+
+	if (!eb)
+		return -ENOMEM;
+
+	write_extent_buffer(eb, body, 0, length);
+	ret = write_and_map_eb(root->fs_info, eb);
+	free_extent_buffer(eb);
+	if (ret)
+		return ret;
+
+	return btrfs_record_file_extent(trans, root, objectid, inode, offset,
+					key.objectid, sectorsize);
+}
+
+static int reiserfs_convert_tail(struct btrfs_trans_handle *trans,
+				 struct btrfs_root *root,
+				 struct btrfs_inode_item *inode,
+				 u64 objectid, u64 offset,
+				 const void *body, unsigned length,
+				 u32 convert_flags)
+{
+	u64 isize;
+	int ret;
+
+	if (length >= BTRFS_MAX_INLINE_DATA_SIZE(root))
+		return convert_direct(trans, root, objectid, inode, body,
+				      length, offset, convert_flags);
+
+	ret = btrfs_insert_inline_extent(trans, root, objectid,
+					 offset, body, length);
+	if (ret)
+		return ret;
+
+	isize = btrfs_stack_inode_nbytes(inode);
+	btrfs_set_stack_inode_nbytes(inode, isize + length);
+
+	return 0;
+}
+
+static inline u32 block_count(u64 size, u32 blocksize)
+{
+	return round_up(size, blocksize) / blocksize;
+}
+
+static int reiserfs_record_file_extents(reiserfs_filsys_t fs,
+					struct btrfs_trans_handle *trans,
+					struct btrfs_root *root,
+					u64 objectid,
+					struct btrfs_inode_item *inode,
+					struct reiserfs_key *sd_key,
+					u32 convert_flags)
+
+{
+	int ret;
+	u32 blocksize = fs->fs_blocksize;
+	u64 inode_size = btrfs_stack_inode_size(inode);
+	u32 last_block;
+	struct reiserfs_blk_iterate_data data;
+
+	init_reiserfs_blk_iterate_data(&data, trans, root, inode,
+				       objectid, convert_flags);
+
+	ret = reiserfs_iterate_file_data(fs, sd_key,
+					 reiserfs_record_indirect_extent,
+					 reiserfs_record_direct_extent, &data);
+	if (ret)
+		return ret;
+
+	/*
+	 * blk_iterate_block has no idea that we're done iterating, so record
+	 * the final range if any.  This range can end and still have a tail
+	 * after it.
+	 */
+	if (data.blk_data.num_blocks) {
+		ret = record_file_blocks(&data.blk_data,
+					 data.blk_data.first_block,
+					 data.blk_data.disk_block,
+					 data.blk_data.num_blocks);
+		if (ret)
+			goto fail;
+		data.blk_data.first_block += data.blk_data.num_blocks;
+		data.blk_data.num_blocks = 0;
+	}
+
+	/*
+	 * Handle a hole at the end of the file.  ReiserFS will
+	 * not write a tail followed by a hole but it will write a hole
+	 * followed by a tail.
+	 */
+	last_block = block_count(inode_size - data.inline_length, blocksize);
+	if (last_block > data.blk_data.first_block) {
+		ret = record_file_blocks(&data.blk_data,
+					 data.blk_data.first_block, 0,
+					 last_block - data.blk_data.first_block);
+		if (ret)
+			goto fail;
+	}
+
+	if (data.inline_length) {
+		ret = reiserfs_convert_tail(trans, root, inode, objectid,
+					    data.inline_offset,
+					    data.inline_data,
+					    data.inline_length, convert_flags);
+		if (ret)
+			goto fail;
+	}
+
+	ret = 0;
+fail:
+	return ret;
+}
+
+static int reiserfs_copy_meta(reiserfs_filsys_t fs, struct btrfs_root *root,
+			      u32 convert_flags, u32 deh_dirid,
+			      u32 deh_objectid, u8 *type);
+
+static int reiserfs_copy_dirent(reiserfs_filsys_t fs,
+				const struct reiserfs_key *dir_short_key,
+				const char *name, size_t len,
+				__u32 deh_dirid, __u32 deh_objectid,
+				void *cb_data)
+{
+	int ret;
+	u8 type;
+	struct btrfs_trans_handle *trans;
+	u64 objectid = deh_objectid + OID_OFFSET;
+	struct reiserfs_convert_info *info = fs->fs_vp;
+	struct reiserfs_dirent_data *dirent_data = cb_data;
+	struct btrfs_root *root = dirent_data->root;
+	__u32 dir_objectid = get_key_objectid(dir_short_key) + OID_OFFSET;
+
+	/*
+	 * These are the extended attributes and shouldn't appear as files
+	 * in the converted file systems.
+	 */
+	if (deh_objectid == get_key_objectid(&info->privroot_key))
+		return 0;
+
+	ret = reiserfs_copy_meta(fs, root, dirent_data->convert_flags,
+				 deh_dirid, deh_objectid, &type);
+	if (ret) {
+		error(
+	"an error occured while converting \"%.*s\", reiserfs key [%u %u]: %s",
+			(int)len, name, deh_dirid, deh_objectid,
+			strerror(-ret));
+		return ret;
+	}
+	trans = btrfs_start_transaction(root, 1);
+	if (IS_ERR(trans))
+		return PTR_ERR(trans);
+
+	ret = convert_insert_dirent(trans, root, name, len, dir_objectid,
+				    objectid, type, dirent_data->index++,
+				    dirent_data->inode);
+	return btrfs_commit_transaction(trans, root);
+}
+
+static int reiserfs_copy_symlink(struct btrfs_trans_handle *trans,
+				 struct btrfs_root *root, u64 objectid,
+				 struct btrfs_inode_item *btrfs_inode,
+				 reiserfs_filsys_t fs,
+				 struct reiserfs_path *sd_path)
+{
+	INITIALIZE_REISERFS_PATH(path);
+	struct item_head *ih = tp_item_head(sd_path);
+	struct reiserfs_key key = ih->ih_key;
+	int ret;
+	char *symlink;
+	int len;
+
+	set_key_uniqueness(&key, type2uniqueness(TYPE_DIRECT));
+	set_key_offset_v1(&key, 1);
+
+	ret = reiserfs_search_by_key_3(fs, &key, &path);
+	if (ret != ITEM_FOUND) {
+		ret = -ENOENT;
+		goto fail;
+	}
+
+	symlink = tp_item_body(&path);
+	len = get_ih_item_len(tp_item_head(&path));
+
+	ret = btrfs_insert_inline_extent(trans, root, objectid, 0,
+					 symlink, len + 1);
+	btrfs_set_stack_inode_nbytes(btrfs_inode, len + 1);
+fail:
+	pathrelse(&path);
+	return ret;
+}
+
+static int reiserfs_copy_meta(reiserfs_filsys_t fs, struct btrfs_root *root,
+			      u32 convert_flags, u32 deh_dirid,
+			      u32 deh_objectid, u8 *type)
+{
+	INITIALIZE_REISERFS_PATH(path);
+	int ret = 0;
+	struct item_head *ih;
+	struct reiserfs_key key;
+	struct btrfs_inode_item btrfs_inode;
+	struct btrfs_trans_handle *trans = NULL;
+	struct reiserfs_convert_info *info = fs->fs_vp;
+	u32 mode;
+	u64 objectid = deh_objectid + OID_OFFSET;
+	u64 parent = deh_dirid + OID_OFFSET;
+	struct reiserfs_dirent_data dirent_data = {
+		.index = 2,
+		.convert_flags = convert_flags,
+		.inode = &btrfs_inode,
+		.root = root,
+	};
+
+	/* The root directory's dirid in reiserfs points to an object
+	 * that does't exist.  In btrfs it's self-referential.
+	 */
+	if (deh_dirid == REISERFS_ROOT_PARENT_OBJECTID)
+		parent = objectid;
+
+	set_key_dirid(&key, deh_dirid);
+	set_key_objectid(&key, deh_objectid);
+	set_key_offset_v2(&key, 0);
+	set_key_type_v2(&key, TYPE_STAT_DATA);
+
+	ret = reiserfs_search_by_key_3(fs, &key, &path);
+	if (ret != ITEM_FOUND) {
+		ret = -ENOENT;
+		goto fail;
+	}
+
+	ih = tp_item_head(&path);
+	if (!is_stat_data_ih(ih)) {
+		ret = -EINVAL;
+		goto fail;
+	}
+
+	reiserfs_copy_inode_item(&btrfs_inode, ih, tp_item_body(&path),
+				 info->copy_attrs);
+	mode = btrfs_stack_inode_mode(&btrfs_inode);
+	*type = mode_to_file_type(mode);
+
+	if (S_ISREG(mode)) {
+		/* Inodes with hardlinks should only be inserted once */
+		if (btrfs_stack_inode_nlink(&btrfs_inode) > 1) {
+			if (lookup_cached_objectid(fs, deh_objectid)) {
+				ret = 0;
+				goto fail; /* Not a failure */
+			}
+			ret = insert_cached_objectid(fs, deh_objectid);
+			if (ret)
+				goto fail;
+		}
+	}
+
+	if (!(convert_flags & CONVERT_FLAG_DATACSUM)) {
+		u32 flags = btrfs_stack_inode_flags(&btrfs_inode) |
+			    BTRFS_INODE_NODATASUM;
+		btrfs_set_stack_inode_flags(&btrfs_inode, flags);
+	}
+
+	switch (mode & S_IFMT) {
+	case S_IFREG:
+		trans = btrfs_start_transaction(root, 1);
+		if (IS_ERR(trans)) {
+			ret = PTR_ERR(trans);
+			goto fail;
+		}
+		ret = reiserfs_record_file_extents(fs, trans, root, objectid,
+						   &btrfs_inode, &ih->ih_key,
+						   convert_flags);
+		if (ret)
+			goto fail;
+		break;
+	case S_IFDIR:
+		ret = reiserfs_iterate_dir(fs, &ih->ih_key,
+					   reiserfs_copy_dirent, &dirent_data);
+		if (ret)
+			goto fail;
+		trans = btrfs_start_transaction(root, 1);
+		if (IS_ERR(trans)) {
+			ret = PTR_ERR(trans);
+			goto fail;
+		}
+
+		ret = btrfs_insert_inode_ref(trans, root, "..", 2, parent,
+					     objectid, 0);
+		break;
+	case S_IFLNK:
+		trans = btrfs_start_transaction(root, 1);
+		if (IS_ERR(trans)) {
+			ret = PTR_ERR(trans);
+			goto fail;
+		}
+		ret = reiserfs_copy_symlink(trans, root, objectid,
+					    &btrfs_inode, fs, &path);
+		if (ret)
+			goto fail;
+		break;
+	default:
+		trans = btrfs_start_transaction(root, 1);
+		if (IS_ERR(trans)) {
+			ret = PTR_ERR(trans);
+			goto fail;
+		}
+	}
+
+	ret = btrfs_insert_inode(trans, root, objectid, &btrfs_inode);
+	if (ret)
+		goto fail;
+	ret = btrfs_commit_transaction(trans, root);
+	info->progress->cur_copy_inodes++;
+
+fail:
+	pathrelse(&path);
+	return ret;
+}
+
+static int reiserfs_xattr_indirect_fn(reiserfs_filsys_t fs, u64 position,
+				      u64 size, int num_blocks,
+				      u32 *blocks, void *data)
+{
+	int i;
+	struct reiserfs_xattr_data *xa_data = data;
+	size_t alloc = min(position + num_blocks * fs->fs_blocksize, size);
+	char *body;
+
+	if (size > BTRFS_LEAF_DATA_SIZE(xa_data->root) -
+	    sizeof(struct btrfs_item) - sizeof(struct btrfs_dir_item)) {
+		fprintf(stderr, "skip large xattr on objectid %llu name %.*s\n",
+			xa_data->target_oid, (int)xa_data->namelen,
+			xa_data->name);
+		return -E2BIG;
+	}
+
+	body = realloc(xa_data->body, alloc);
+	if (!body)
+		return -ENOMEM;
+
+	xa_data->body = body;
+	xa_data->len = alloc;
+
+	for (i = 0; i < num_blocks; i++) {
+		int ret;
+		u32 block = d32_get(blocks, i);
+		u64 offset = (u64)block * fs->fs_blocksize;
+		size_t chunk = min_t(u64, size - position, fs->fs_blocksize);
+		char *buffer = xa_data->body + position;
+
+		ret = read_disk_extent(xa_data->root, offset, chunk, buffer);
+		if (ret)
+			return ret;
+		position += chunk;
+	}
+
+	return 0;
+}
+
+static int reiserfs_xattr_direct_fn(reiserfs_filsys_t fs, __u64 position,
+				    __u64 size, const char *body, size_t len,
+				    void *data)
+{
+	struct reiserfs_xattr_data *xa_data = data;
+	char *newbody;
+
+	if (size > BTRFS_LEAF_DATA_SIZE(xa_data->root) -
+	    sizeof(struct btrfs_item) - sizeof(struct btrfs_dir_item)) {
+		fprintf(stderr, "skip large xattr on objectid %llu name %.*s\n",
+			xa_data->target_oid, (int)xa_data->namelen,
+			xa_data->name);
+		return -E2BIG;
+	}
+
+	newbody = realloc(xa_data->body, position + len);
+	if (!newbody)
+		return -ENOMEM;
+	xa_data->body = newbody;
+	xa_data->len = position + len;
+	memcpy(xa_data->body + position, body, len);
+	return 0;
+}
+
+static int reiserfs_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;
+	struct reiserfs_acl_entry *src_entry;
+
+	if (src_size < sizeof(struct reiserfs_acl_header))
+		goto fail;
+	if (((struct reiserfs_acl_header *)src)->a_version !=
+	    cpu_to_le32(REISERFS_ACL_VERSION))
+		goto fail;
+	src += sizeof(struct reiserfs_acl_header);
+	count = reiserfs_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 = (struct reiserfs_acl_entry *)src;
+		if (src + sizeof(struct reiserfs_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(struct reiserfs_acl_entry_short);
+			dst_entry->e_id = cpu_to_le32(ACL_UNDEFINED_ID);
+			break;
+		case ACL_USER:
+		case ACL_GROUP:
+			src += sizeof(struct reiserfs_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 int reiserfs_copy_one_xattr(reiserfs_filsys_t fs,
+				   const struct reiserfs_key *dir_short_key,
+				   const char *name, size_t namelen,
+				   __u32 deh_dirid,
+				   __u32 deh_objectid, void *cb_data)
+{
+	struct reiserfs_convert_info *info = fs->fs_vp;
+	struct reiserfs_xattr_data *xa_data = cb_data;
+	struct reiserfs_key key = {
+		.k2_dir_id = deh_dirid,
+		.k2_objectid = deh_objectid,
+	};
+	void *body = NULL;
+	int len;
+	int ret;
+
+	xa_data->name = name;
+	xa_data->namelen = namelen;
+
+	ret = reiserfs_iterate_file_data(fs, &key, reiserfs_xattr_indirect_fn,
+					 reiserfs_xattr_direct_fn, cb_data);
+	if (ret)
+		goto out;
+
+	if (!reiserfs_check_xattr(xa_data->body, xa_data->len)) {
+		fprintf(stderr,
+			"skip corrupted xattr on objectid %u name %.*s\n",
+			deh_objectid, (int)xa_data->namelen,
+			xa_data->name);
+		goto out;
+	}
+
+	body = xa_data->body + sizeof(struct reiserfs_xattr_header);
+	len = xa_data->len - sizeof(struct reiserfs_xattr_header);
+
+	if (!strncmp("system.posix_acl_default", name, namelen) ||
+	    !strncmp("system.posix_acl_access", name, namelen)) {
+		size_t bufsize = acl_ea_size(ext2_acl_count(len));
+		char *databuf = malloc(bufsize);
+
+		if (!databuf)
+			goto out;
+		ret = reiserfs_acl_to_xattr(databuf, body, bufsize, len);
+		if (ret)
+			goto out;
+		body = databuf;
+		len = bufsize;
+	}
+
+	ret = btrfs_insert_xattr_item(xa_data->trans, xa_data->root,
+				      name, namelen, body, len,
+				      xa_data->target_oid);
+
+	info->progress->cur_copy_inodes++;
+out:
+	if (body &&
+	    body != xa_data->body + sizeof(struct reiserfs_xattr_header))
+		free(body);
+	if (xa_data->body)
+		free(xa_data->body);
+	xa_data->body = NULL;
+	xa_data->len = 0;
+
+	return ret;
+}
+
+static int reiserfs_copy_xattr_dir(reiserfs_filsys_t fs,
+				   const struct reiserfs_key *dir_short_key,
+				   const char *name, size_t len,
+				   __u32 deh_dirid, __u32 deh_objectid,
+				   void *cb_data)
+{
+	struct reiserfs_convert_info *info = fs->fs_vp;
+	struct reiserfs_xattr_data *xa_data = cb_data;
+	struct reiserfs_key dir_key = {
+		.k2_dir_id = deh_dirid,
+		.k2_objectid = deh_objectid,
+	};
+	int ret, err;
+
+	errno = 0;
+	xa_data->target_oid = strtoull(name, NULL, 16);
+	if (xa_data->target_oid == ULLONG_MAX && errno)
+		return -errno;
+
+	xa_data->target_oid += OID_OFFSET;
+
+	xa_data->trans = btrfs_start_transaction(xa_data->root, 1);
+	if (IS_ERR(xa_data->trans))
+		return PTR_ERR(xa_data->trans);
+
+	ret = reiserfs_iterate_dir(fs, &dir_key,
+				    reiserfs_copy_one_xattr, xa_data);
+
+	err = btrfs_commit_transaction(xa_data->trans, xa_data->root);
+	info->progress->cur_copy_inodes++;
+	xa_data->trans = NULL;
+	return ret ?: err;
+}
+
+static int reiserfs_copy_xattrs(reiserfs_filsys_t fs, struct btrfs_root *root)
+{
+	struct reiserfs_convert_info *info = fs->fs_vp;
+	struct reiserfs_xattr_data data = {
+		.root = root,
+	};
+
+	if (get_key_objectid(&info->xattr_key) == 0)
+		return 0;
+
+	return reiserfs_iterate_dir(fs, &info->xattr_key,
+				    reiserfs_copy_xattr_dir, &data);
+}
+
+static int reiserfs_copy_inodes(struct btrfs_convert_context *cxt,
+				struct btrfs_root *root,
+				u32 convert_flags,
+				struct task_ctx *p)
+{
+	reiserfs_filsys_t fs = cxt->fs_data;
+	struct reiserfs_convert_info *info = fs->fs_vp;
+	int ret;
+	u8 type;
+
+	info->progress = p;
+
+	ret = reiserfs_locate_privroot(fs);
+	if (ret)
+		goto out;
+
+	ret = reiserfs_copy_meta(fs, root, convert_flags,
+				 REISERFS_ROOT_PARENT_OBJECTID,
+				 REISERFS_ROOT_OBJECTID, &type);
+	if (ret)
+		goto out;
+
+	if (convert_flags & CONVERT_FLAG_XATTR)
+		ret = reiserfs_copy_xattrs(fs, root);
+
+out:
+	info->progress = NULL;
+	return ret;
+}
+
+static int reiserfs_read_used_space(struct btrfs_convert_context *cxt)
+{
+	reiserfs_filsys_t fs = cxt->fs_data;
+	u64 start, end = 0;
+	unsigned int size = get_sb_block_count(fs->fs_ondisk_sb);
+	unsigned long *bitmap = (unsigned long *)fs->fs_bitmap2->bm_map;
+	int ret = 0;
+
+	/*
+	 * We have the entire bitmap loaded so we can just ping pong with
+	 * ffz and ffs
+	 */
+	while (end < size) {
+		u64 offset, length;
+
+		start = find_next_bit(bitmap, size, end);
+		if (start >= size)
+			break;
+		end = find_next_zero_bit(bitmap, size, start);
+		if (end > size)
+			end = size;
+		offset = start * fs->fs_blocksize;
+		length = (end - start) * fs->fs_blocksize;
+		ret = add_merge_cache_extent(&cxt->used_space, offset, length);
+		if (ret < 0)
+			break;
+	}
+
+	return ret;
+}
+
+static int reiserfs_check_state(struct btrfs_convert_context *cxt)
+{
+	return 0;
+}
+
+const struct btrfs_convert_operations reiserfs_convert_ops = {
+	.name		= "reiserfs",
+	.open_fs	= reiserfs_open_fs,
+	.read_used_space = reiserfs_read_used_space,
+	.copy_inodes	= reiserfs_copy_inodes,
+	.close_fs	= reiserfs_close_fs,
+	.check_state	= reiserfs_check_state,
+};
+
+#endif /* BTRFSCONVERT_REISERFS */