File 2010-btrfs-convert-add-support-to-convert-reise... of Package btrfsprogs

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File 2010-btrfs-convert-add-support-to-convert-reiserfs.patch of Package btrfsprogs (Revision 284f19b03a5b80740585ce2295b7a003)

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From: Jeff Mahoney <jeffm@suse.com>
Subject: btrfs-convert: add support to convert reiserfs
Git-commit: 99340c2ef762f3da92e4bb4ce3b2f6d5fc6ef9d0
Patch-mainline: v4.13
References: fate#313096

This patch adds support to convert reiserfs file systems in-place to btrfs.

It will convert extended attribute files to btrfs extended attributes,
translate ACLs, coalesce tails that consist of multiple items into one item,
and convert tails that are too big into indirect files.

It also prints status information in the form of objectid counts every
10,000 objectids converted (including extended attributes).

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
---
 Makefile.in     |    2 +-
 btrfs-convert.c | 1191 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 configure.ac    |    1 +
 3 files changed, 1193 insertions(+), 1 deletion(-)

Index: btrfs-progs-v4.5.3/Makefile.in
===================================================================
--- btrfs-progs-v4.5.3.orig/Makefile.in
+++ btrfs-progs-v4.5.3/Makefile.in
@@ -128,7 +128,7 @@ endif
 
 # external libs required by various binaries; for btrfs-foo,
 # specify btrfs_foo_libs = <list of libs>; see $($(subst...)) rules below
-btrfs_convert_libs = @EXT2FS_LIBS@ @COM_ERR_LIBS@
+btrfs_convert_libs = @EXT2FS_LIBS@ @COM_ERR_LIBS@ @REISERFS_LIBS@
 btrfs_fragments_libs = -lgd -lpng -ljpeg -lfreetype
 btrfs_debug_tree_objects = cmds-inspect-dump-tree.o
 btrfs_show_super_objects = cmds-inspect-dump-super.o
Index: btrfs-progs-v4.5.3/btrfs-convert.c
===================================================================
--- btrfs-progs-v4.5.3.orig/btrfs-convert.c
+++ btrfs-progs-v4.5.3/btrfs-convert.c
@@ -29,6 +29,7 @@
 #include <uuid/uuid.h>
 #include <linux/limits.h>
 #include <getopt.h>
+#include <limits.h>
 
 #include "ctree.h"
 #include "disk-io.h"
@@ -40,6 +41,8 @@
 #include <ext2fs/ext2_fs.h>
 #include <ext2fs/ext2fs.h>
 #include <ext2fs/ext2_ext_attr.h>
+#include <reiserfs/io.h>
+#include <reiserfs/reiserfs_lib.h>
 
 #define INO_OFFSET (BTRFS_FIRST_FREE_OBJECTID - EXT2_ROOT_INO)
 #define CONV_IMAGE_SUBVOL_OBJECTID BTRFS_FIRST_FREE_OBJECTID
@@ -1131,6 +1134,21 @@ static inline dev_t new_decode_dev(u32 d
 	return MKDEV(major, minor);
 }
 
+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 int copy_inode_item(struct btrfs_inode_item *dst,
 			   struct ext2_inode *src, u32 blocksize)
 {
@@ -2427,8 +2445,1181 @@ static const struct btrfs_convert_operat
 	.close_fs		= ext2_close_fs,
 };
 
+struct reiserfs_convert_info {
+	int privroot_found;
+	struct reiserfs_key privroot_key;
+	struct reiserfs_key xattr_key;
+	u32 used_objectids;
+	u32 converted_objectids;
+
+	/* used to track hardlinks */
+	unsigned used_slots;
+	unsigned alloced_slots;
+	u64 *objectids;
+};
+
+static int reiserfs_open_fs(struct btrfs_convert_context *cxt, const char *name)
+{
+	reiserfs_filsys_t fs;
+	int 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->volume_name = fs->fs_ondisk_sb->s_label;
+	cxt->blocksize = fs->fs_blocksize;
+	cxt->block_count = get_sb_block_count(fs->fs_ondisk_sb);
+	cxt->first_data_block = 0;
+	fs->fs_vp = calloc(1, sizeof(struct reiserfs_convert_info));
+	if (!fs->fs_vp) {
+		reiserfs_close(fs);
+		return -1;
+	}
+
+	return 0;
+}
+
+static int reiserfs_alloc_block(struct btrfs_convert_context *cxt, u64 goal,
+				u64 *block_ret)
+{
+	int ret;
+	reiserfs_filsys_t fs = cxt->fs_data;
+	unsigned long block = goal;
+
+	ret = reiserfs_bitmap_find_zero_bit(fs->fs_bitmap2, &block);
+
+	if (ret != 0)
+		return -1;
+
+	reiserfs_bitmap_set_bit(fs->fs_bitmap2, block);
+
+	*block_ret = block;
+	return 0;
+}
+
+static void bc_reiserfs_free_block(struct btrfs_convert_context *cxt, u64 block)
+{
+	reiserfs_filsys_t fs = cxt->fs_data;
+	reiserfs_bitmap_clear_bit(fs->fs_bitmap2, block);
+}
+
+static int reiserfs_test_block(struct btrfs_convert_context *cxt, u64 block64)
+{
+	reiserfs_filsys_t fs = cxt->fs_data;
+	u32 block = block64;
+
+	BUG_ON(block != block64);
+	return reiserfs_bitmap_test_bit(fs->fs_bitmap2, block);
+}
+
+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) {
+		info->converted_objectids++;
+		err = reiserfs_find_entry(fs, &info->privroot_key, "xattrs",
+					  &generation, &info->xattr_key);
+		if (err == 1)
+			info->converted_objectids++;
+		else
+			memset(&info->xattr_key, 0, sizeof(info->xattr_key));
+	}
+
+	return 0;
+}
+
+static void reiserfs_copy_inode_item(struct btrfs_inode_item *inode,
+				     struct item_head *ih, void *stat_data)
+{
+	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 = new_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 = new_decode_dev(sd_v2_rdev(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);
+}
+
+/* This should move to libreiserfscore */
+typedef int (*iterate_indirect_fn)(reiserfs_filsys_t fs, u64 position,
+				   u64 size, int num_blocks,
+				   u32 *blocks, void *data);
+typedef int (*iterate_direct_fn)(reiserfs_filsys_t fs, u64 position,
+				 u64 size, char *body,
+				 size_t len, void *data);
+
+static int reiserfs_iterate_file_data(reiserfs_filsys_t fs,
+			      const struct reiserfs_key const *short_key,
+			      iterate_indirect_fn indirect_fn,
+			      iterate_direct_fn direct_fn,
+			      void *data)
+{
+	INITIALIZE_REISERFS_PATH(path);
+	struct reiserfs_key key = {
+		.k2_dir_id = short_key->k2_dir_id,
+		.k2_objectid = short_key->k2_objectid,
+	};
+	struct item_head *ih;
+	u64 size;
+	u64 position = 0;
+	int ret;
+
+	set_key_type_v2(&key, TYPE_STAT_DATA);
+	set_key_offset_v2(&key, 0);
+
+	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;
+	}
+
+	if (get_ih_key_format(ih) == KEY_FORMAT_1) {
+		struct stat_data_v1 *sd = tp_item_body(&path);
+		size = sd_v1_size(sd);
+	} else {
+		struct stat_data *sd = tp_item_body(&path);
+		size = sd_v2_size(sd);
+	}
+
+	pathrelse(&path);
+
+	set_key_offset_v2(&key, 1);
+	set_key_type_v2(&key, TYPE_DIRECT);
+
+	while (position < size) {
+		struct item_head *ih = tp_item_head(&path);
+		u64 offset;
+
+		ret = reiserfs_search_by_position(fs, &key, 0, &path);
+		ih = tp_item_head(&path);
+		if (ret != POSITION_FOUND) {
+			reiserfs_warning(stderr,
+				"found %k instead of %k [%d] (%lu, %lu)\n",
+				&ih->ih_key, &key, ret, position, size);
+			if (ret != ITEM_NOT_FOUND)
+				ret = -EIO;
+			goto fail;
+		}
+
+		offset = get_offset(&ih->ih_key);
+
+		position = offset - 1;
+
+		if (is_indirect_key(&ih->ih_key)) {
+			int num_ptrs = get_ih_item_len(ih) / 4;
+			u32 *ptrs = tp_item_body(&path);
+
+			BUG_ON(!num_ptrs);
+			ret = indirect_fn(fs, position, size, num_ptrs,
+					  ptrs, data);
+			if (ret)
+				goto fail;
+			position += num_ptrs * fs->fs_blocksize;
+		} else if (is_direct_key(&ih->ih_key)) {
+			int len = get_ih_item_len(ih);
+
+			ret = direct_fn(fs, position, size, tp_item_body(&path),
+					len, data);
+			if (ret)
+				goto fail;
+			position += len;
+		} else
+			break;
+		pathrelse(&path);
+		set_key_offset_v2(&key, position + 1);
+	}
+
+	ret = 0;
+
+fail:
+	pathrelse(&path);
+	return ret;
+}
+
+struct reiserfs_blk_iterate_data {
+	struct blk_iterate_data blk_data;
+	int indirect;
+	char *inline_data;
+	u64 inline_offset;
+	u32 inline_length;
+};
+
+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, int checksum)
+{
+	init_blk_iterate_data(&data->blk_data, trans, root, inode, objectid,
+			      checksum);
+	data->indirect = 0;
+	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;
+
+	bdata->indirect = 1;
+
+	for (i = 0; i < num_ptrs; i++) {
+		u32 block = d32_get(ptrs, i);
+
+		ret = block_iterate_proc(block, file_block++, &bdata->blk_data);
+		if (ret)
+			break;
+	}
+
+	return ret;
+}
+
+static int reiserfs_record_direct_extent(reiserfs_filsys_t fs, u64 position,
+					 u64 size, 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;
+
+	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, int checksum)
+{
+	struct btrfs_key key;
+	u32 sectorsize = root->sectorsize;
+	int ret;
+	struct extent_buffer *eb;
+
+	BUG_ON(length > sectorsize);
+	ret = custom_alloc_extent(root, sectorsize, 0, &key, 0);
+	if (ret)
+		return ret;
+
+	eb = btrfs_find_create_tree_block(root->fs_info,
+					  key.objectid, sectorsize);
+	if (!eb)
+		return -ENOMEM;
+
+	write_extent_buffer(eb, body, 0, length);
+	ret = write_and_map_eb(trans, root, eb);
+	free_extent_buffer(eb);
+	if (ret)
+		return ret;
+
+	ret = btrfs_record_file_extent(trans, root, objectid,
+				       inode, offset, key.objectid,
+				       sectorsize);
+	if (ret || !checksum)
+		return ret;
+
+	return csum_disk_extent(trans, root, key.objectid, sectorsize);
+}
+
+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,
+					int datacsum)
+
+{
+	int ret;
+	struct reiserfs_blk_iterate_data data;
+	init_reiserfs_blk_iterate_data(&data, trans, root, inode,
+				       objectid, datacsum);
+
+	ret = reiserfs_iterate_file_data(fs, sd_key,
+					 reiserfs_record_indirect_extent,
+					 reiserfs_record_direct_extent, &data);
+	if (ret)
+		return ret;
+
+	if (data.indirect && 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;
+	}
+	if (data.inline_length) {
+		if (data.inline_length < BTRFS_MAX_INLINE_DATA_SIZE(root)) {
+			int isize;
+			ret = btrfs_insert_inline_extent(trans, root,
+							 objectid,
+							 data.inline_offset,
+							 data.inline_data,
+							 data.inline_length);
+			if (ret)
+				goto fail;
+
+			isize = btrfs_stack_inode_nbytes(inode);
+			btrfs_set_stack_inode_nbytes(inode,
+					     isize + data.inline_length);
+		} else {
+			ret = convert_direct(trans, root, objectid, inode,
+					     data.inline_data,
+					     data.inline_length,
+					     data.inline_offset, datacsum);
+			if (ret)
+				goto fail;
+		}
+	}
+
+	ret = 0;
+fail:
+	return ret;
+}
+
+#define OID_OFFSET (BTRFS_FIRST_FREE_OBJECTID - REISERFS_ROOT_OBJECTID)
+static int reiserfs_copy_meta(reiserfs_filsys_t fs, struct btrfs_root *root,
+			      int datacsum, u32 deh_dirid, u32 deh_objectid,
+			      u8 *type);
+
+struct reiserfs_dirent_data {
+	u64 index;
+	int datacsum;
+	struct btrfs_inode_item *inode;
+	struct btrfs_root *root;
+};
+
+static int reiserfs_copy_dirent(reiserfs_filsys_t fs,
+				const char *name, size_t len,
+				u64 dir_objectid,
+				u64 deh_dirid, u64 deh_objectid, void *cb_data)
+{
+	int ret;
+	u8 type;
+	struct btrfs_trans_handle *trans;
+	u64 objectid = deh_objectid + OID_OFFSET;
+	struct reiserfs_dirent_data *dirent_data = cb_data;
+	struct btrfs_root *root = dirent_data->root;
+
+	ret = reiserfs_copy_meta(fs, root, dirent_data->datacsum,
+				 deh_dirid, deh_objectid, &type);
+	if (ret)
+		return ret;
+	trans = btrfs_start_transaction(root, 1);
+	if (!trans)
+		return -ENOMEM;
+
+	ret = convert_insert_dirent(trans, root, name, len, dir_objectid,
+				    objectid, type, dirent_data->index++,
+				    dirent_data->inode);
+	return btrfs_commit_transaction(trans, root);
+}
+
+typedef int (*reiserfs_iterate_dir_fn)(reiserfs_filsys_t fs,
+				       const char *name, size_t len,
+				       u64 dir_objectid,
+				       u64 deh_dirid, u64 deh_objectid,
+				       void *cb_data);
+
+static int reiserfs_iterate_dir(reiserfs_filsys_t fs,
+				struct reiserfs_key *dir_key,
+				reiserfs_iterate_dir_fn callback, void *cb_data)
+
+{
+	INITIALIZE_REISERFS_PATH(path);
+	struct reiserfs_key *next_key;
+	struct reiserfs_convert_info *info = fs->fs_vp;
+	struct reiserfs_key min_key = {};
+	struct reiserfs_de_head *deh;
+	struct reiserfs_key next_item_key;
+	int ret;
+	u64 next_pos = DOT_OFFSET;
+
+	set_key_dirid(&next_item_key, get_key_dirid(dir_key));
+	set_key_objectid(&next_item_key, get_key_objectid(dir_key));
+	set_key_offset_v1(&next_item_key, DOT_OFFSET);
+	set_key_uniqueness(&next_item_key, DIRENTRY_UNIQUENESS);
+
+	while (1) {
+		u32 pos;
+		int i;
+		struct item_head *ih;
+		ret = reiserfs_search_by_entry_key(fs, &next_item_key, &path);
+		if (ret != POSITION_FOUND) {
+			reiserfs_warning(stderr,
+				"search by entry key for %k: %d\n",
+				&next_item_key, ret);
+			break;
+	       }
+
+		ret = 0;
+
+		ih = tp_item_head(&path);
+		deh = tp_item_body(&path);
+		pos = path.pos_in_item;
+
+		deh += pos;
+		for (i = pos; i < get_ih_entry_count(ih); i++, deh++) {
+			const char *name;
+			size_t name_len;
+			if (get_deh_offset(deh) == DOT_OFFSET ||
+			    get_deh_offset(deh) == DOT_DOT_OFFSET)
+				continue;
+
+			/* There will only be one of these */
+			if (info->privroot_key.k2_objectid &&
+			    !info->privroot_found &&
+			    info->privroot_key.k2_dir_id == deh->deh2_dir_id &&
+			    info->privroot_key.k2_objectid ==
+				deh->deh2_objectid) {
+				info->privroot_found = 1;
+				continue;
+			}
+
+			name = tp_item_body(&path) + get_deh_location(deh);
+			name_len = entry_length(ih, deh, i);
+			if (!name[name_len - 1])
+				name_len = strlen(name);
+
+			ret = callback(fs, name, name_len,
+				       get_key_objectid(dir_key) + OID_OFFSET,
+				       get_deh_dirid(deh),
+				       get_deh_objectid(deh), cb_data);
+			if (ret)
+				goto fail;
+
+			next_pos = get_deh_offset(deh) + 1;
+		}
+
+		next_key = uget_rkey(&path);
+		if (!next_key)
+			break;
+		if (!comp_keys(next_key, &min_key)) {
+			set_key_offset_v2(&next_item_key, next_pos);
+			pathrelse(&path);
+			continue;
+		}
+
+		if (comp_short_keys(next_key, &next_item_key))
+			break;
+
+		next_item_key = *next_key;
+		pathrelse(&path);
+	}
+fail:
+	pathrelse(&path);
+	return ret;
+}
+
+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;
+	const 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,
+			      int datacsum, 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;
+	struct reiserfs_dirent_data dirent_data = {
+		.index = 2,
+		.datacsum = datacsum,
+		.inode = &btrfs_inode,
+		.root = root,
+	};
+
+	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));
+	mode = btrfs_stack_inode_mode(&btrfs_inode);
+	*type = mode_to_file_type(mode);
+
+	/* Inodes with hardlinks should only be inserted once */
+	if (S_ISREG(mode) && 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;
+	}
+
+	switch (mode & S_IFMT) {
+	case S_IFREG:
+		trans = btrfs_start_transaction(root, 1);
+		if (!trans) {
+			ret = -ENOMEM;
+			goto fail;
+		}
+		ret = reiserfs_record_file_extents(fs, trans, root, objectid,
+						   &btrfs_inode, &ih->ih_key,
+						   datacsum);
+		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 (!trans) {
+			ret = -ENOMEM;
+			goto fail;
+		}
+		ret = btrfs_insert_inode_ref(trans, root, "..", 2,
+					     objectid, objectid, 0);
+		break;
+	case S_IFLNK:
+		trans = btrfs_start_transaction(root, 1);
+		if (!trans) {
+			ret = -ENOMEM;
+			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 (!trans) {
+			ret = -ENOMEM;
+			goto fail;
+		}
+	}
+
+	ret = btrfs_insert_inode(trans, root, objectid, &btrfs_inode);
+	if (ret)
+		goto fail;
+	ret = btrfs_commit_transaction(trans, root);
+
+	if ((++info->converted_objectids % 10000) == 0)
+		printf("%d objectids converted.\n", info->converted_objectids);
+fail:
+	pathrelse(&path);
+	return ret;
+}
+
+static void reiserfs_count_objectids(reiserfs_filsys_t fs)
+{
+	struct reiserfs_convert_info *info = fs->fs_vp;
+	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);
+
+	info->used_objectids = count;
+	printf("file system contains %u objectids (including extended attributes)\n",
+	       info->used_objectids);
+
+}
+struct reiserfs_xattr_data {
+	struct btrfs_root *root;
+	struct btrfs_trans_handle *trans;
+	u64 target_oid;
+	const char *name;
+	size_t namelen;
+	void *body;
+	size_t len;
+};
+
+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, 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, data, len);
+	return 0;
+}
+
+/* All this *should* be in reiserfscore */
+#ifndef REISERFS_XATTR_MAGIC
+/* Magic value in header */
+#define REISERFS_XATTR_MAGIC 0x52465841 /* "RFXA" */
+
+struct reiserfs_xattr_header {
+	__le32 h_magic;		/* magic number for identification */
+	__le32 h_hash;		/* hash of the value */
+};
+
+static inline unsigned short from32to16(unsigned int x)
+{
+	/* add up 16-bit and 16-bit for 16+c bit */
+	x = (x & 0xffff) + (x >> 16);
+	/* add up carry.. */
+	x = (x & 0xffff) + (x >> 16);
+	return x;
+}
+
+static unsigned int do_csum(const unsigned char *buff, int len)
+{
+	int odd;
+	unsigned int result = 0;
+
+	if (len <= 0)
+		goto out;
+	odd = 1 & (unsigned long) buff;
+	if (odd) {
+#ifdef __LITTLE_ENDIAN
+		result += (*buff << 8);
+#else
+		result = *buff;
+#endif
+		len--;
+		buff++;
+	}
+	if (len >= 2) {
+		if (2 & (unsigned long) buff) {
+			result += *(unsigned short *) buff;
+			len -= 2;
+			buff += 2;
+		}
+		if (len >= 4) {
+			const unsigned char *end = buff + ((unsigned)len & ~3);
+			unsigned int carry = 0;
+			do {
+				unsigned int w = *(unsigned int *) buff;
+				buff += 4;
+				result += carry;
+				result += w;
+				carry = (w > result);
+			} while (buff < end);
+			result += carry;
+			result = (result & 0xffff) + (result >> 16);
+		}
+		if (len & 2) {
+			result += *(unsigned short *) buff;
+			buff += 2;
+		}
+	}
+	if (len & 1)
+#ifdef __LITTLE_ENDIAN
+		result += *buff;
+#else
+		result += (*buff << 8);
+#endif
+	result = from32to16(result);
+	if (odd)
+		result = ((result >> 8) & 0xff) | ((result & 0xff) << 8);
+out:
+	return result;
+}
+
+__wsum csum_partial(const void *buff, int len, __wsum wsum)
+{
+	unsigned int sum = (__force unsigned int)wsum;
+	unsigned int result = do_csum(buff, len);
+
+	/* add in old sum, and carry.. */
+	result += sum;
+	if (sum > result)
+		result += 1;
+	return (__force __wsum)result;
+}
+
+static inline __u32 reiserfs_xattr_hash(const char *msg, int len)
+{
+	return csum_partial(msg, len, 0);
+}
+
+static int reiserfs_check_xattr(const void *body, int len)
+{
+	const struct reiserfs_xattr_header *xah = body;
+	u32 hash = reiserfs_xattr_hash(body + 8, len - 8);
+
+	return xah->h_magic == cpu_to_le32(REISERFS_XATTR_MAGIC) &&
+	       le32_to_cpu(xah->h_hash) == hash;
+}
+
+#define REISERFS_ACL_VERSION 0x0001
+
+struct reiserfs_acl_entry {
+	__le16		e_tag;
+	__le16		e_perm;
+	__le32		e_id;
+};
+
+struct reiserfs_acl_entry_short {
+	__le16		e_tag;
+	__le16		e_perm;
+};
+
+struct reiserfs_acl_header {
+	__le32		a_version;
+};
+
+static inline int reiserfs_acl_count(size_t size)
+{
+	ssize_t s;
+
+	size -= sizeof(struct reiserfs_acl_header);
+	s = size - 4 * sizeof(struct reiserfs_acl_entry_short);
+	if (s < 0) {
+		if (size % sizeof(struct reiserfs_acl_entry_short))
+			return -1;
+		return size / sizeof(struct reiserfs_acl_entry_short);
+	} else {
+		if (s % sizeof(struct reiserfs_acl_entry))
+			return -1;
+		return s / sizeof(struct reiserfs_acl_entry) + 4;
+	}
+}
+
+
+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;
+}
+#endif
+
+static int reiserfs_copy_one_xattr(reiserfs_filsys_t fs,
+				   const char *name, size_t namelen,
+				   u64 dir_objectid, u64 deh_dirid,
+				   u64 deh_objectid, void *cb_data)
+{
+	int ret;
+	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;
+
+	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;
+
+	ret = reiserfs_check_xattr(xa_data->body, xa_data->len);
+	if (ret) {
+		fprintf(stderr,
+			"skip corrupted xattr on objectid %llu name %.*s\n",
+		xa_data->target_oid, (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);
+
+	if ((++info->converted_objectids % 10000) == 0)
+		printf("%d objectids converted.\n", info->converted_objectids);
+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 char *name, size_t len,
+				   u64 dir_objectid, u64 deh_dirid,
+				   u64 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 (!xa_data->trans)
+		return -ENOMEM;
+
+	ret = reiserfs_iterate_dir(fs, &dir_key,
+				    reiserfs_copy_one_xattr, xa_data);
+
+	if ((++info->converted_objectids % 10000) == 0)
+		printf("%d objectids converted.\n", info->converted_objectids);
+	err = btrfs_commit_transaction(xa_data->trans, xa_data->root);
+	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 (info->xattr_key.k2_objectid == 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,
+				int datacsum, int packing, int noxattr,
+				struct task_ctx *p)
+{
+	reiserfs_filsys_t fs = cxt->fs_data;
+	struct reiserfs_convert_info *info = fs->fs_vp;
+	int ret;
+	u8 type;
+
+	reiserfs_count_objectids(fs);
+
+	ret = reiserfs_locate_privroot(fs);
+	if (ret)
+		return ret;
+
+	ret = reiserfs_copy_meta(fs, root, datacsum,
+				 REISERFS_ROOT_PARENT_OBJECTID,
+				 REISERFS_ROOT_OBJECTID, &type);
+	if (ret || noxattr)
+		return ret;
+
+	ret = reiserfs_copy_xattrs(fs, root);
+	printf("%d objectids converted.\n", info->converted_objectids);
+	return ret;
+}
+
+static struct btrfs_convert_operations reiserfs_convert_ops = {
+	.name		= "reiserfs",
+	.open_fs	= reiserfs_open_fs,
+	.alloc_block	= reiserfs_alloc_block,
+	.copy_inodes	= reiserfs_copy_inodes,
+	.test_block	= reiserfs_test_block,
+	.free_block	= bc_reiserfs_free_block,
+	.close_fs	= reiserfs_close_fs,
+};
+
 static const struct btrfs_convert_operations *convert_operations[] = {
 	&ext2_convert_ops,
+	&reiserfs_convert_ops,
 };
 
 static int convert_open_fs(const char *devname,
Index: btrfs-progs-v4.5.3/configure.ac
===================================================================
--- btrfs-progs-v4.5.3.orig/configure.ac
+++ btrfs-progs-v4.5.3/configure.ac
@@ -107,6 +107,7 @@ AC_SUBST([DISABLE_BTRFSCONVERT])
 				  [E2fsprogs does not support BIGALLOC])]
 			)])
 	PKG_CHECK_MODULES(COM_ERR, [com_err])
+	PKG_CHECK_MODULES(REISERFS, [reiserfscore])
 fi

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File 2010-btrfs-convert-add-support-to-convert-reiserfs.patch of Package btrfsprogs (Revision 284f19b03a5b80740585ce2295b7a003)

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