New upstream release Closes: #849353, #817806, #854915, #845473

1 files changed, 0 insertions, 2937 deletions

diff --git a/btrfs-image.c b/btrfs-image.c
deleted file mode 100644
index 953d368d..00000000
--- a/btrfs-image.c
+++ /dev/null
@@ -1,2937 +0,0 @@
-/*
- * Copyright (C) 2008 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 <pthread.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <fcntl.h>
-#include <unistd.h>
-#include <dirent.h>
-#include <zlib.h>
-#include <getopt.h>
-
-#include "kerncompat.h"
-#include "crc32c.h"
-#include "ctree.h"
-#include "disk-io.h"
-#include "transaction.h"
-#include "utils.h"
-#include "volumes.h"
-#include "extent_io.h"
-
-#define HEADER_MAGIC		0xbd5c25e27295668bULL
-#define MAX_PENDING_SIZE	(256 * 1024)
-#define BLOCK_SIZE		1024
-#define BLOCK_MASK		(BLOCK_SIZE - 1)
-
-#define COMPRESS_NONE		0
-#define COMPRESS_ZLIB		1
-
-struct meta_cluster_item {
-	__le64 bytenr;
-	__le32 size;
-} __attribute__ ((__packed__));
-
-struct meta_cluster_header {
-	__le64 magic;
-	__le64 bytenr;
-	__le32 nritems;
-	u8 compress;
-} __attribute__ ((__packed__));
-
-/* cluster header + index items + buffers */
-struct meta_cluster {
-	struct meta_cluster_header header;
-	struct meta_cluster_item items[];
-} __attribute__ ((__packed__));
-
-#define ITEMS_PER_CLUSTER ((BLOCK_SIZE - sizeof(struct meta_cluster)) / \
-			   sizeof(struct meta_cluster_item))
-
-struct fs_chunk {
-	u64 logical;
-	u64 physical;
-	/*
-	 * physical_dup only store additonal physical for BTRFS_BLOCK_GROUP_DUP
-	 * currently restore only support single and DUP
-	 * TODO: modify this structure and the function related to this
-	 * structure for support RAID*
-	 */
-	u64 physical_dup;
-	u64 bytes;
-	struct rb_node l;
-	struct rb_node p;
-	struct list_head list;
-};
-
-struct async_work {
-	struct list_head list;
-	struct list_head ordered;
-	u64 start;
-	u64 size;
-	u8 *buffer;
-	size_t bufsize;
-	int error;
-};
-
-struct metadump_struct {
-	struct btrfs_root *root;
-	FILE *out;
-
-	struct meta_cluster *cluster;
-
-	pthread_t *threads;
-	size_t num_threads;
-	pthread_mutex_t mutex;
-	pthread_cond_t cond;
-	struct rb_root name_tree;
-
-	struct list_head list;
-	struct list_head ordered;
-	size_t num_items;
-	size_t num_ready;
-
-	u64 pending_start;
-	u64 pending_size;
-
-	int compress_level;
-	int done;
-	int data;
-	int sanitize_names;
-
-	int error;
-};
-
-struct name {
-	struct rb_node n;
-	char *val;
-	char *sub;
-	u32 len;
-};
-
-struct mdrestore_struct {
-	FILE *in;
-	FILE *out;
-
-	pthread_t *threads;
-	size_t num_threads;
-	pthread_mutex_t mutex;
-	pthread_cond_t cond;
-
-	struct rb_root chunk_tree;
-	struct rb_root physical_tree;
-	struct list_head list;
-	struct list_head overlapping_chunks;
-	size_t num_items;
-	u32 nodesize;
-	u64 devid;
-	u64 alloced_chunks;
-	u64 last_physical_offset;
-	u8 uuid[BTRFS_UUID_SIZE];
-	u8 fsid[BTRFS_FSID_SIZE];
-
-	int compress_method;
-	int done;
-	int error;
-	int old_restore;
-	int fixup_offset;
-	int multi_devices;
-	int clear_space_cache;
-	struct btrfs_fs_info *info;
-};
-
-static int search_for_chunk_blocks(struct mdrestore_struct *mdres,
-				   u64 search, u64 cluster_bytenr);
-static struct extent_buffer *alloc_dummy_eb(u64 bytenr, u32 size);
-
-static void csum_block(u8 *buf, size_t len)
-{
-	char result[BTRFS_CRC32_SIZE];
-	u32 crc = ~(u32)0;
-	crc = crc32c(crc, buf + BTRFS_CSUM_SIZE, len - BTRFS_CSUM_SIZE);
-	btrfs_csum_final(crc, result);
-	memcpy(buf, result, BTRFS_CRC32_SIZE);
-}
-
-static int has_name(struct btrfs_key *key)
-{
-	switch (key->type) {
-	case BTRFS_DIR_ITEM_KEY:
-	case BTRFS_DIR_INDEX_KEY:
-	case BTRFS_INODE_REF_KEY:
-	case BTRFS_INODE_EXTREF_KEY:
-	case BTRFS_XATTR_ITEM_KEY:
-		return 1;
-	default:
-		break;
-	}
-
-	return 0;
-}
-
-static char *generate_garbage(u32 name_len)
-{
-	char *buf = malloc(name_len);
-	int i;
-
-	if (!buf)
-		return NULL;
-
-	for (i = 0; i < name_len; i++) {
-		char c = rand_range(94) + 33;
-
-		if (c == '/')
-			c++;
-		buf[i] = c;
-	}
-
-	return buf;
-}
-
-static int name_cmp(struct rb_node *a, struct rb_node *b, int fuzz)
-{
-	struct name *entry = rb_entry(a, struct name, n);
-	struct name *ins = rb_entry(b, struct name, n);
-	u32 len;
-
-	len = min(ins->len, entry->len);
-	return memcmp(ins->val, entry->val, len);
-}
-
-static int chunk_cmp(struct rb_node *a, struct rb_node *b, int fuzz)
-{
-	struct fs_chunk *entry = rb_entry(a, struct fs_chunk, l);
-	struct fs_chunk *ins = rb_entry(b, struct fs_chunk, l);
-
-	if (fuzz && ins->logical >= entry->logical &&
-	    ins->logical < entry->logical + entry->bytes)
-		return 0;
-
-	if (ins->logical < entry->logical)
-		return -1;
-	else if (ins->logical > entry->logical)
-		return 1;
-	return 0;
-}
-
-static int physical_cmp(struct rb_node *a, struct rb_node *b, int fuzz)
-{
-	struct fs_chunk *entry = rb_entry(a, struct fs_chunk, p);
-	struct fs_chunk *ins = rb_entry(b, struct fs_chunk, p);
-
-	if (fuzz && ins->physical >= entry->physical &&
-	    ins->physical < entry->physical + entry->bytes)
-		return 0;
-
-	if (fuzz && entry->physical >= ins->physical &&
-	    entry->physical < ins->physical + ins->bytes)
-		return 0;
-
-	if (ins->physical < entry->physical)
-		return -1;
-	else if (ins->physical > entry->physical)
-		return 1;
-	return 0;
-}
-
-static void tree_insert(struct rb_root *root, struct rb_node *ins,
-			int (*cmp)(struct rb_node *a, struct rb_node *b,
-				   int fuzz))
-{
-	struct rb_node ** p = &root->rb_node;
-	struct rb_node * parent = NULL;
-	int dir;
-
-	while(*p) {
-		parent = *p;
-
-		dir = cmp(*p, ins, 1);
-		if (dir < 0)
-			p = &(*p)->rb_left;
-		else if (dir > 0)
-			p = &(*p)->rb_right;
-		else
-			BUG();
-	}
-
-	rb_link_node(ins, parent, p);
-	rb_insert_color(ins, root);
-}
-
-static struct rb_node *tree_search(struct rb_root *root,
-				   struct rb_node *search,
-				   int (*cmp)(struct rb_node *a,
-					      struct rb_node *b, int fuzz),
-				   int fuzz)
-{
-	struct rb_node *n = root->rb_node;
-	int dir;
-
-	while (n) {
-		dir = cmp(n, search, fuzz);
-		if (dir < 0)
-			n = n->rb_left;
-		else if (dir > 0)
-			n = n->rb_right;
-		else
-			return n;
-	}
-
-	return NULL;
-}
-
-static u64 logical_to_physical(struct mdrestore_struct *mdres, u64 logical,
-			       u64 *size, u64 *physical_dup)
-{
-	struct fs_chunk *fs_chunk;
-	struct rb_node *entry;
-	struct fs_chunk search;
-	u64 offset;
-
-	if (logical == BTRFS_SUPER_INFO_OFFSET)
-		return logical;
-
-	search.logical = logical;
-	entry = tree_search(&mdres->chunk_tree, &search.l, chunk_cmp, 1);
-	if (!entry) {
-		if (mdres->in != stdin)
-			printf("Couldn't find a chunk, using logical\n");
-		return logical;
-	}
-	fs_chunk = rb_entry(entry, struct fs_chunk, l);
-	if (fs_chunk->logical > logical || fs_chunk->logical + fs_chunk->bytes < logical)
-		BUG();
-	offset = search.logical - fs_chunk->logical;
-
-	if (physical_dup) {
-		/* Only in dup case, physical_dup is not equal to 0 */
-		if (fs_chunk->physical_dup)
-			*physical_dup = fs_chunk->physical_dup + offset;
-		else
-			*physical_dup = 0;
-	}
-
-	*size = min(*size, fs_chunk->bytes + fs_chunk->logical - logical);
-	return fs_chunk->physical + offset;
-}
-
-
-static char *find_collision(struct metadump_struct *md, char *name,
-			    u32 name_len)
-{
-	struct name *val;
-	struct rb_node *entry;
-	struct name tmp;
-	unsigned long checksum;
-	int found = 0;
-	int i;
-
-	tmp.val = name;
-	tmp.len = name_len;
-	entry = tree_search(&md->name_tree, &tmp.n, name_cmp, 0);
-	if (entry) {
-		val = rb_entry(entry, struct name, n);
-		free(name);
-		return val->sub;
-	}
-
-	val = malloc(sizeof(struct name));
-	if (!val) {
-		fprintf(stderr, "Couldn't sanitize name, enomem\n");
-		free(name);
-		return NULL;
-	}
-
-	memset(val, 0, sizeof(*val));
-
-	val->val = name;
-	val->len = name_len;
-	val->sub = malloc(name_len);
-	if (!val->sub) {
-		fprintf(stderr, "Couldn't sanitize name, enomem\n");
-		free(val);
-		free(name);
-		return NULL;
-	}
-
-	checksum = crc32c(~1, val->val, name_len);
-	memset(val->sub, ' ', name_len);
-	i = 0;
-	while (1) {
-		if (crc32c(~1, val->sub, name_len) == checksum &&
-		    memcmp(val->sub, val->val, val->len)) {
-			found = 1;
-			break;
-		}
-
-		if (val->sub[i] == 127) {
-			do {
-				i++;
-				if (i >= name_len)
-					break;
-			} while (val->sub[i] == 127);
-
-			if (i >= name_len)
-				break;
-			val->sub[i]++;
-			if (val->sub[i] == '/')
-				val->sub[i]++;
-			memset(val->sub, ' ', i);
-			i = 0;
-			continue;
-		} else {
-			val->sub[i]++;
-			if (val->sub[i] == '/')
-				val->sub[i]++;
-		}
-	}
-
-	if (!found) {
-		fprintf(stderr, "Couldn't find a collision for '%.*s', "
-			"generating normal garbage, it won't match indexes\n",
-			val->len, val->val);
-		for (i = 0; i < name_len; i++) {
-			char c = rand_range(94) + 33;
-
-			if (c == '/')
-				c++;
-			val->sub[i] = c;
-		}
-	}
-
-	tree_insert(&md->name_tree, &val->n, name_cmp);
-	return val->sub;
-}
-
-static void sanitize_dir_item(struct metadump_struct *md, struct extent_buffer *eb,
-			      int slot)
-{
-	struct btrfs_dir_item *dir_item;
-	char *buf;
-	char *garbage;
-	unsigned long name_ptr;
-	u32 total_len;
-	u32 cur = 0;
-	u32 this_len;
-	u32 name_len;
-	int free_garbage = (md->sanitize_names == 1);
-
-	dir_item = btrfs_item_ptr(eb, slot, struct btrfs_dir_item);
-	total_len = btrfs_item_size_nr(eb, slot);
-	while (cur < total_len) {
-		this_len = sizeof(*dir_item) +
-			btrfs_dir_name_len(eb, dir_item) +
-			btrfs_dir_data_len(eb, dir_item);
-		name_ptr = (unsigned long)(dir_item + 1);
-		name_len = btrfs_dir_name_len(eb, dir_item);
-
-		if (md->sanitize_names > 1) {
-			buf = malloc(name_len);
-			if (!buf) {
-				fprintf(stderr, "Couldn't sanitize name, "
-					"enomem\n");
-				return;
-			}
-			read_extent_buffer(eb, buf, name_ptr, name_len);
-			garbage = find_collision(md, buf, name_len);
-		} else {
-			garbage = generate_garbage(name_len);
-		}
-		if (!garbage) {
-			fprintf(stderr, "Couldn't sanitize name, enomem\n");
-			return;
-		}
-		write_extent_buffer(eb, garbage, name_ptr, name_len);
-		cur += this_len;
-		dir_item = (struct btrfs_dir_item *)((char *)dir_item +
-						     this_len);
-		if (free_garbage)
-			free(garbage);
-	}
-}
-
-static void sanitize_inode_ref(struct metadump_struct *md,
-			       struct extent_buffer *eb, int slot, int ext)
-{
-	struct btrfs_inode_extref *extref;
-	struct btrfs_inode_ref *ref;
-	char *garbage, *buf;
-	unsigned long ptr;
-	unsigned long name_ptr;
-	u32 item_size;
-	u32 cur_offset = 0;
-	int len;
-	int free_garbage = (md->sanitize_names == 1);
-
-	item_size = btrfs_item_size_nr(eb, slot);
-	ptr = btrfs_item_ptr_offset(eb, slot);
-	while (cur_offset < item_size) {
-		if (ext) {
-			extref = (struct btrfs_inode_extref *)(ptr +
-							       cur_offset);
-			name_ptr = (unsigned long)(&extref->name);
-			len = btrfs_inode_extref_name_len(eb, extref);
-			cur_offset += sizeof(*extref);
-		} else {
-			ref = (struct btrfs_inode_ref *)(ptr + cur_offset);
-			len = btrfs_inode_ref_name_len(eb, ref);
-			name_ptr = (unsigned long)(ref + 1);
-			cur_offset += sizeof(*ref);
-		}
-		cur_offset += len;
-
-		if (md->sanitize_names > 1) {
-			buf = malloc(len);
-			if (!buf) {
-				fprintf(stderr, "Couldn't sanitize name, "
-					"enomem\n");
-				return;
-			}
-			read_extent_buffer(eb, buf, name_ptr, len);
-			garbage = find_collision(md, buf, len);
-		} else {
-			garbage = generate_garbage(len);
-		}
-
-		if (!garbage) {
-			fprintf(stderr, "Couldn't sanitize name, enomem\n");
-			return;
-		}
-		write_extent_buffer(eb, garbage, name_ptr, len);
-		if (free_garbage)
-			free(garbage);
-	}
-}
-
-static void sanitize_xattr(struct metadump_struct *md,
-			   struct extent_buffer *eb, int slot)
-{
-	struct btrfs_dir_item *dir_item;
-	unsigned long data_ptr;
-	u32 data_len;
-
-	dir_item = btrfs_item_ptr(eb, slot, struct btrfs_dir_item);
-	data_len = btrfs_dir_data_len(eb, dir_item);
-
-	data_ptr = (unsigned long)((char *)(dir_item + 1) +
-				   btrfs_dir_name_len(eb, dir_item));
-	memset_extent_buffer(eb, 0, data_ptr, data_len);
-}
-
-static void sanitize_name(struct metadump_struct *md, u8 *dst,
-			  struct extent_buffer *src, struct btrfs_key *key,
-			  int slot)
-{
-	struct extent_buffer *eb;
-
-	eb = alloc_dummy_eb(src->start, src->len);
-	if (!eb) {
-		fprintf(stderr, "Couldn't sanitize name, no memory\n");
-		return;
-	}
-
-	memcpy(eb->data, dst, eb->len);
-
-	switch (key->type) {
-	case BTRFS_DIR_ITEM_KEY:
-	case BTRFS_DIR_INDEX_KEY:
-		sanitize_dir_item(md, eb, slot);
-		break;
-	case BTRFS_INODE_REF_KEY:
-		sanitize_inode_ref(md, eb, slot, 0);
-		break;
-	case BTRFS_INODE_EXTREF_KEY:
-		sanitize_inode_ref(md, eb, slot, 1);
-		break;
-	case BTRFS_XATTR_ITEM_KEY:
-		sanitize_xattr(md, eb, slot);
-		break;
-	default:
-		break;
-	}
-
-	memcpy(dst, eb->data, eb->len);
-	free(eb);
-}
-
-/*
- * zero inline extents and csum items
- */
-static void zero_items(struct metadump_struct *md, u8 *dst,
-		       struct extent_buffer *src)
-{
-	struct btrfs_file_extent_item *fi;
-	struct btrfs_item *item;
-	struct btrfs_key key;
-	u32 nritems = btrfs_header_nritems(src);
-	size_t size;
-	unsigned long ptr;
-	int i, extent_type;
-
-	for (i = 0; i < nritems; i++) {
-		item = btrfs_item_nr(i);
-		btrfs_item_key_to_cpu(src, &key, i);
-		if (key.type == BTRFS_CSUM_ITEM_KEY) {
-			size = btrfs_item_size_nr(src, i);
-			memset(dst + btrfs_leaf_data(src) +
-			       btrfs_item_offset_nr(src, i), 0, size);
-			continue;
-		}
-
-		if (md->sanitize_names && has_name(&key)) {
-			sanitize_name(md, dst, src, &key, i);
-			continue;
-		}
-
-		if (key.type != BTRFS_EXTENT_DATA_KEY)
-			continue;
-
-		fi = btrfs_item_ptr(src, i, struct btrfs_file_extent_item);
-		extent_type = btrfs_file_extent_type(src, fi);
-		if (extent_type != BTRFS_FILE_EXTENT_INLINE)
-			continue;
-
-		ptr = btrfs_file_extent_inline_start(fi);
-		size = btrfs_file_extent_inline_item_len(src, item);
-		memset(dst + ptr, 0, size);
-	}
-}
-
-/*
- * copy buffer and zero useless data in the buffer
- */
-static void copy_buffer(struct metadump_struct *md, u8 *dst,
-			struct extent_buffer *src)
-{
-	int level;
-	size_t size;
-	u32 nritems;
-
-	memcpy(dst, src->data, src->len);
-	if (src->start == BTRFS_SUPER_INFO_OFFSET)
-		return;
-
-	level = btrfs_header_level(src);
-	nritems = btrfs_header_nritems(src);
-
-	if (nritems == 0) {
-		size = sizeof(struct btrfs_header);
-		memset(dst + size, 0, src->len - size);
-	} else if (level == 0) {
-		size = btrfs_leaf_data(src) +
-			btrfs_item_offset_nr(src, nritems - 1) -
-			btrfs_item_nr_offset(nritems);
-		memset(dst + btrfs_item_nr_offset(nritems), 0, size);
-		zero_items(md, dst, src);
-	} else {
-		size = offsetof(struct btrfs_node, ptrs) +
-			sizeof(struct btrfs_key_ptr) * nritems;
-		memset(dst + size, 0, src->len - size);
-	}
-	csum_block(dst, src->len);
-}
-
-static void *dump_worker(void *data)
-{
-	struct metadump_struct *md = (struct metadump_struct *)data;
-	struct async_work *async;
-	int ret;
-
-	while (1) {
-		pthread_mutex_lock(&md->mutex);
-		while (list_empty(&md->list)) {
-			if (md->done) {
-				pthread_mutex_unlock(&md->mutex);
-				goto out;
-			}
-			pthread_cond_wait(&md->cond, &md->mutex);
-		}
-		async = list_entry(md->list.next, struct async_work, list);
-		list_del_init(&async->list);
-		pthread_mutex_unlock(&md->mutex);
-
-		if (md->compress_level > 0) {
-			u8 *orig = async->buffer;
-
-			async->bufsize = compressBound(async->size);
-			async->buffer = malloc(async->bufsize);
-			if (!async->buffer) {
-				fprintf(stderr, "Error allocating buffer\n");
-				pthread_mutex_lock(&md->mutex);
-				if (!md->error)
-					md->error = -ENOMEM;
-				pthread_mutex_unlock(&md->mutex);
-				pthread_exit(NULL);
-			}
-
-			ret = compress2(async->buffer,
-					 (unsigned long *)&async->bufsize,
-					 orig, async->size, md->compress_level);
-
-			if (ret != Z_OK)
-				async->error = 1;
-
-			free(orig);
-		}
-
-		pthread_mutex_lock(&md->mutex);
-		md->num_ready++;
-		pthread_mutex_unlock(&md->mutex);
-	}
-out:
-	pthread_exit(NULL);
-}
-
-static void meta_cluster_init(struct metadump_struct *md, u64 start)
-{
-	struct meta_cluster_header *header;
-
-	md->num_items = 0;
-	md->num_ready = 0;
-	header = &md->cluster->header;
-	header->magic = cpu_to_le64(HEADER_MAGIC);
-	header->bytenr = cpu_to_le64(start);
-	header->nritems = cpu_to_le32(0);
-	header->compress = md->compress_level > 0 ?
-			   COMPRESS_ZLIB : COMPRESS_NONE;
-}
-
-static void metadump_destroy(struct metadump_struct *md, int num_threads)
-{
-	int i;
-	struct rb_node *n;
-
-	pthread_mutex_lock(&md->mutex);
-	md->done = 1;
-	pthread_cond_broadcast(&md->cond);
-	pthread_mutex_unlock(&md->mutex);
-
-	for (i = 0; i < num_threads; i++)
-		pthread_join(md->threads[i], NULL);
-
-	pthread_cond_destroy(&md->cond);
-	pthread_mutex_destroy(&md->mutex);
-
-	while ((n = rb_first(&md->name_tree))) {
-		struct name *name;
-
-		name = rb_entry(n, struct name, n);
-		rb_erase(n, &md->name_tree);
-		free(name->val);
-		free(name->sub);
-		free(name);
-	}
-	free(md->threads);
-	free(md->cluster);
-}
-
-static int metadump_init(struct metadump_struct *md, struct btrfs_root *root,
-			 FILE *out, int num_threads, int compress_level,
-			 int sanitize_names)
-{
-	int i, ret = 0;
-
-	memset(md, 0, sizeof(*md));
-	md->cluster = calloc(1, BLOCK_SIZE);
-	if (!md->cluster)
-		return -ENOMEM;
-	md->threads = calloc(num_threads, sizeof(pthread_t));
-	if (!md->threads) {
-		free(md->cluster);
-		return -ENOMEM;
-	}
-	INIT_LIST_HEAD(&md->list);
-	INIT_LIST_HEAD(&md->ordered);
-	md->root = root;
-	md->out = out;
-	md->pending_start = (u64)-1;
-	md->compress_level = compress_level;
-	md->sanitize_names = sanitize_names;
-	if (sanitize_names > 1)
-		crc32c_optimization_init();
-
-	md->name_tree.rb_node = NULL;
-	md->num_threads = num_threads;
-	pthread_cond_init(&md->cond, NULL);
-	pthread_mutex_init(&md->mutex, NULL);
-	meta_cluster_init(md, 0);
-
-	if (!num_threads)
-		return 0;
-
-	for (i = 0; i < num_threads; i++) {
-		ret = pthread_create(md->threads + i, NULL, dump_worker, md);
-		if (ret)
-			break;
-	}
-
-	if (ret)
-		metadump_destroy(md, i + 1);
-
-	return ret;
-}
-
-static int write_zero(FILE *out, size_t size)
-{
-	static char zero[BLOCK_SIZE];
-	return fwrite(zero, size, 1, out);
-}
-
-static int write_buffers(struct metadump_struct *md, u64 *next)
-{
-	struct meta_cluster_header *header = &md->cluster->header;
-	struct meta_cluster_item *item;
-	struct async_work *async;
-	u64 bytenr = 0;
-	u32 nritems = 0;
-	int ret;
-	int err = 0;
-
-	if (list_empty(&md->ordered))
-		goto out;
-
-	/* wait until all buffers are compressed */
-	while (!err && md->num_items > md->num_ready) {
-		struct timespec ts = {
-			.tv_sec = 0,
-			.tv_nsec = 10000000,
-		};
-		pthread_mutex_unlock(&md->mutex);
-		nanosleep(&ts, NULL);
-		pthread_mutex_lock(&md->mutex);
-		err = md->error;
-	}
-
-	if (err) {
-		fprintf(stderr, "One of the threads errored out %s\n",
-				strerror(err));
-		goto out;
-	}
-
-	/* setup and write index block */
-	list_for_each_entry(async, &md->ordered, ordered) {
-		item = md->cluster->items + nritems;
-		item->bytenr = cpu_to_le64(async->start);
-		item->size = cpu_to_le32(async->bufsize);
-		nritems++;
-	}
-	header->nritems = cpu_to_le32(nritems);
-
-	ret = fwrite(md->cluster, BLOCK_SIZE, 1, md->out);
-	if (ret != 1) {
-		fprintf(stderr, "Error writing out cluster: %d\n", errno);
-		return -EIO;
-	}
-
-	/* write buffers */
-	bytenr += le64_to_cpu(header->bytenr) + BLOCK_SIZE;
-	while (!list_empty(&md->ordered)) {
-		async = list_entry(md->ordered.next, struct async_work,
-				   ordered);
-		list_del_init(&async->ordered);
-
-		bytenr += async->bufsize;
-		if (!err)
-			ret = fwrite(async->buffer, async->bufsize, 1,
-				     md->out);
-		if (ret != 1) {
-			err = -EIO;
-			ret = 0;
-			fprintf(stderr, "Error writing out cluster: %d\n",
-				errno);
-		}
-
-		free(async->buffer);
-		free(async);
-	}
-
-	/* zero unused space in the last block */
-	if (!err && bytenr & BLOCK_MASK) {
-		size_t size = BLOCK_SIZE - (bytenr & BLOCK_MASK);
-
-		bytenr += size;
-		ret = write_zero(md->out, size);
-		if (ret != 1) {
-			fprintf(stderr, "Error zeroing out buffer: %d\n",
-				errno);
-			err = -EIO;
-		}
-	}
-out:
-	*next = bytenr;
-	return err;
-}
-
-static int read_data_extent(struct metadump_struct *md,
-			    struct async_work *async)
-{
-	struct btrfs_root *root = md->root;
-	u64 bytes_left = async->size;
-	u64 logical = async->start;
-	u64 offset = 0;
-	u64 read_len;
-	int num_copies;
-	int cur_mirror;
-	int ret;
-
-	num_copies = btrfs_num_copies(&root->fs_info->mapping_tree, logical,
-				      bytes_left);
-
-	/* Try our best to read data, just like read_tree_block() */
-	for (cur_mirror = 0; cur_mirror < num_copies; cur_mirror++) {
-		while (bytes_left) {
-			read_len = bytes_left;
-			ret = read_extent_data(root,
-					(char *)(async->buffer + offset),
-					logical, &read_len, cur_mirror);
-			if (ret < 0)
-				break;
-			offset += read_len;
-			logical += read_len;
-			bytes_left -= read_len;
-		}
-	}
-	if (bytes_left)
-		return -EIO;
-	return 0;
-}
-
-static int get_dev_fd(struct btrfs_root *root)
-{
-	struct btrfs_device *dev;
-
-	dev = list_first_entry(&root->fs_info->fs_devices->devices,
-			       struct btrfs_device, dev_list);
-	return dev->fd;
-}
-
-static int flush_pending(struct metadump_struct *md, int done)
-{
-	struct async_work *async = NULL;
-	struct extent_buffer *eb;
-	u64 blocksize = md->root->nodesize;
-	u64 start;
-	u64 size;
-	size_t offset;
-	int ret = 0;
-
-	if (md->pending_size) {
-		async = calloc(1, sizeof(*async));
-		if (!async)
-			return -ENOMEM;
-
-		async->start = md->pending_start;
-		async->size = md->pending_size;
-		async->bufsize = async->size;
-		async->buffer = malloc(async->bufsize);
-		if (!async->buffer) {
-			free(async);
-			return -ENOMEM;
-		}
-		offset = 0;
-		start = async->start;
-		size = async->size;
-
-		if (md->data) {
-			ret = read_data_extent(md, async);
-			if (ret) {
-				free(async->buffer);
-				free(async);
-				return ret;
-			}
-		}
-
-		/*
-		 * Balance can make the mapping not cover the super block, so
-		 * just copy directly from one of the devices.
-		 */
-		if (start == BTRFS_SUPER_INFO_OFFSET) {
-			int fd = get_dev_fd(md->root);
-
-			ret = pread64(fd, async->buffer, size, start);
-			if (ret < size) {
-				free(async->buffer);
-				free(async);
-				fprintf(stderr, "Error reading superblock\n");
-				return -EIO;
-			}
-			size = 0;
-			ret = 0;
-		}
-
-		while (!md->data && size > 0) {
-			u64 this_read = min(blocksize, size);
-			eb = read_tree_block(md->root, start, this_read, 0);
-			if (!extent_buffer_uptodate(eb)) {
-				free(async->buffer);
-				free(async);
-				fprintf(stderr,
-					"Error reading metadata block\n");
-				return -EIO;
-			}
-			copy_buffer(md, async->buffer + offset, eb);
-			free_extent_buffer(eb);
-			start += this_read;
-			offset += this_read;
-			size -= this_read;
-		}
-
-		md->pending_start = (u64)-1;
-		md->pending_size = 0;
-	} else if (!done) {
-		return 0;
-	}
-
-	pthread_mutex_lock(&md->mutex);
-	if (async) {
-		list_add_tail(&async->ordered, &md->ordered);
-		md->num_items++;
-		if (md->compress_level > 0) {
-			list_add_tail(&async->list, &md->list);
-			pthread_cond_signal(&md->cond);
-		} else {
-			md->num_ready++;
-		}
-	}
-	if (md->num_items >= ITEMS_PER_CLUSTER || done) {
-		ret = write_buffers(md, &start);
-		if (ret)
-			fprintf(stderr, "Error writing buffers %d\n",
-				errno);
-		else
-			meta_cluster_init(md, start);
-	}
-	pthread_mutex_unlock(&md->mutex);
-	return ret;
-}
-
-static int add_extent(u64 start, u64 size, struct metadump_struct *md,
-		      int data)
-{
-	int ret;
-	if (md->data != data ||
-	    md->pending_size + size > MAX_PENDING_SIZE ||
-	    md->pending_start + md->pending_size != start) {
-		ret = flush_pending(md, 0);
-		if (ret)
-			return ret;
-		md->pending_start = start;
-	}
-	readahead_tree_block(md->root, start, size, 0);
-	md->pending_size += size;
-	md->data = data;
-	return 0;
-}
-
-#ifdef BTRFS_COMPAT_EXTENT_TREE_V0
-static int is_tree_block(struct btrfs_root *extent_root,
-			 struct btrfs_path *path, u64 bytenr)
-{
-	struct extent_buffer *leaf;
-	struct btrfs_key key;
-	u64 ref_objectid;
-	int ret;
-
-	leaf = path->nodes[0];
-	while (1) {
-		struct btrfs_extent_ref_v0 *ref_item;
-		path->slots[0]++;
-		if (path->slots[0] >= btrfs_header_nritems(leaf)) {
-			ret = btrfs_next_leaf(extent_root, path);
-			if (ret < 0)
-				return ret;
-			if (ret > 0)
-				break;
-			leaf = path->nodes[0];
-		}
-		btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
-		if (key.objectid != bytenr)
-			break;
-		if (key.type != BTRFS_EXTENT_REF_V0_KEY)
-			continue;
-		ref_item = btrfs_item_ptr(leaf, path->slots[0],
-					  struct btrfs_extent_ref_v0);
-		ref_objectid = btrfs_ref_objectid_v0(leaf, ref_item);
-		if (ref_objectid < BTRFS_FIRST_FREE_OBJECTID)
-			return 1;
-		break;
-	}
-	return 0;
-}
-#endif
-
-static int copy_tree_blocks(struct btrfs_root *root, struct extent_buffer *eb,
-			    struct metadump_struct *metadump, int root_tree)
-{
-	struct extent_buffer *tmp;
-	struct btrfs_root_item *ri;
-	struct btrfs_key key;
-	u64 bytenr;
-	int level;
-	int nritems = 0;
-	int i = 0;
-	int ret;
-
-	ret = add_extent(btrfs_header_bytenr(eb), root->nodesize, metadump, 0);
-	if (ret) {
-		fprintf(stderr, "Error adding metadata block\n");
-		return ret;
-	}
-
-	if (btrfs_header_level(eb) == 0 && !root_tree)
-		return 0;
-
-	level = btrfs_header_level(eb);
-	nritems = btrfs_header_nritems(eb);
-	for (i = 0; i < nritems; i++) {
-		if (level == 0) {
-			btrfs_item_key_to_cpu(eb, &key, i);
-			if (key.type != BTRFS_ROOT_ITEM_KEY)
-				continue;
-			ri = btrfs_item_ptr(eb, i, struct btrfs_root_item);
-			bytenr = btrfs_disk_root_bytenr(eb, ri);
-			tmp = read_tree_block(root, bytenr, root->nodesize, 0);
-			if (!extent_buffer_uptodate(tmp)) {
-				fprintf(stderr,
-					"Error reading log root block\n");
-				return -EIO;
-			}
-			ret = copy_tree_blocks(root, tmp, metadump, 0);
-			free_extent_buffer(tmp);
-			if (ret)
-				return ret;
-		} else {
-			bytenr = btrfs_node_blockptr(eb, i);
-			tmp = read_tree_block(root, bytenr, root->nodesize, 0);
-			if (!extent_buffer_uptodate(tmp)) {
-				fprintf(stderr, "Error reading log block\n");
-				return -EIO;
-			}
-			ret = copy_tree_blocks(root, tmp, metadump, root_tree);
-			free_extent_buffer(tmp);
-			if (ret)
-				return ret;
-		}
-	}
-
-	return 0;
-}
-
-static int copy_log_trees(struct btrfs_root *root,
-			  struct metadump_struct *metadump,
-			  struct btrfs_path *path)
-{
-	u64 blocknr = btrfs_super_log_root(root->fs_info->super_copy);
-
-	if (blocknr == 0)
-		return 0;
-
-	if (!root->fs_info->log_root_tree ||
-	    !root->fs_info->log_root_tree->node) {
-		fprintf(stderr, "Error copying tree log, it wasn't setup\n");
-		return -EIO;
-	}
-
-	return copy_tree_blocks(root, root->fs_info->log_root_tree->node,
-				metadump, 1);
-}
-
-static int copy_space_cache(struct btrfs_root *root,
-			    struct metadump_struct *metadump,
-			    struct btrfs_path *path)
-{
-	struct extent_buffer *leaf;
-	struct btrfs_file_extent_item *fi;
-	struct btrfs_key key;
-	u64 bytenr, num_bytes;
-	int ret;
-
-	root = root->fs_info->tree_root;
-
-	key.objectid = 0;
-	key.type = BTRFS_EXTENT_DATA_KEY;
-	key.offset = 0;
-
-	ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
-	if (ret < 0) {
-		fprintf(stderr, "Error searching for free space inode %d\n",
-			ret);
-		return ret;
-	}
-
-	leaf = path->nodes[0];
-
-	while (1) {
-		if (path->slots[0] >= btrfs_header_nritems(leaf)) {
-			ret = btrfs_next_leaf(root, path);
-			if (ret < 0) {
-				fprintf(stderr, "Error going to next leaf "
-					"%d\n", ret);
-				return ret;
-			}
-			if (ret > 0)
-				break;
-			leaf = path->nodes[0];
-		}
-
-		btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
-		if (key.type != BTRFS_EXTENT_DATA_KEY) {
-			path->slots[0]++;
-			continue;
-		}
-
-		fi = btrfs_item_ptr(leaf, path->slots[0],
-				    struct btrfs_file_extent_item);
-		if (btrfs_file_extent_type(leaf, fi) !=
-		    BTRFS_FILE_EXTENT_REG) {
-			path->slots[0]++;
-			continue;
-		}
-
-		bytenr = btrfs_file_extent_disk_bytenr(leaf, fi);
-		num_bytes = btrfs_file_extent_disk_num_bytes(leaf, fi);
-		ret = add_extent(bytenr, num_bytes, metadump, 1);
-		if (ret) {
-			fprintf(stderr, "Error adding space cache blocks %d\n",
-				ret);
-			btrfs_release_path(path);
-			return ret;
-		}
-		path->slots[0]++;
-	}
-
-	return 0;
-}
-
-static int copy_from_extent_tree(struct metadump_struct *metadump,
-				 struct btrfs_path *path)
-{
-	struct btrfs_root *extent_root;
-	struct extent_buffer *leaf;
-	struct btrfs_extent_item *ei;
-	struct btrfs_key key;
-	u64 bytenr;
-	u64 num_bytes;
-	int ret;
-
-	extent_root = metadump->root->fs_info->extent_root;
-	bytenr = BTRFS_SUPER_INFO_OFFSET + BTRFS_SUPER_INFO_SIZE;
-	key.objectid = bytenr;
-	key.type = BTRFS_EXTENT_ITEM_KEY;
-	key.offset = 0;
-
-	ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0);
-	if (ret < 0) {
-		fprintf(stderr, "Error searching extent root %d\n", ret);
-		return ret;
-	}
-	ret = 0;
-
-	leaf = path->nodes[0];
-
-	while (1) {
-		if (path->slots[0] >= btrfs_header_nritems(leaf)) {
-			ret = btrfs_next_leaf(extent_root, path);
-			if (ret < 0) {
-				fprintf(stderr, "Error going to next leaf %d"
-					"\n", ret);
-				break;
-			}
-			if (ret > 0) {
-				ret = 0;
-				break;
-			}
-			leaf = path->nodes[0];
-		}
-
-		btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
-		if (key.objectid < bytenr ||
-		    (key.type != BTRFS_EXTENT_ITEM_KEY &&
-		     key.type != BTRFS_METADATA_ITEM_KEY)) {
-			path->slots[0]++;
-			continue;
-		}
-
-		bytenr = key.objectid;
-		if (key.type == BTRFS_METADATA_ITEM_KEY)
-			num_bytes = extent_root->nodesize;
-		else
-			num_bytes = key.offset;
-
-		if (btrfs_item_size_nr(leaf, path->slots[0]) > sizeof(*ei)) {
-			ei = btrfs_item_ptr(leaf, path->slots[0],
-					    struct btrfs_extent_item);
-			if (btrfs_extent_flags(leaf, ei) &
-			    BTRFS_EXTENT_FLAG_TREE_BLOCK) {
-				ret = add_extent(bytenr, num_bytes, metadump,
-						 0);
-				if (ret) {
-					fprintf(stderr, "Error adding block "
-						"%d\n", ret);
-					break;
-				}
-			}
-		} else {
-#ifdef BTRFS_COMPAT_EXTENT_TREE_V0
-			ret = is_tree_block(extent_root, path, bytenr);
-			if (ret < 0) {
-				fprintf(stderr, "Error checking tree block "
-					"%d\n", ret);
-				break;
-			}
-
-			if (ret) {
-				ret = add_extent(bytenr, num_bytes, metadump,
-						 0);
-				if (ret) {
-					fprintf(stderr, "Error adding block "
-						"%d\n", ret);
-					break;
-				}
-			}
-			ret = 0;
-#else
-			fprintf(stderr, "Either extent tree corruption or "
-				"you haven't built with V0 support\n");
-			ret = -EIO;
-			break;
-#endif
-		}
-		bytenr += num_bytes;
-	}
-
-	btrfs_release_path(path);
-
-	return ret;
-}
-
-static int create_metadump(const char *input, FILE *out, int num_threads,
-			   int compress_level, int sanitize, int walk_trees)
-{
-	struct btrfs_root *root;
-	struct btrfs_path *path = NULL;
-	struct metadump_struct metadump;
-	int ret;
-	int err = 0;
-
-	root = open_ctree(input, 0, 0);
-	if (!root) {
-		fprintf(stderr, "Open ctree failed\n");
-		return -EIO;
-	}
-
-	ret = metadump_init(&metadump, root, out, num_threads,
-			    compress_level, sanitize);
-	if (ret) {
-		fprintf(stderr, "Error initializing metadump %d\n", ret);
-		close_ctree(root);
-		return ret;
-	}
-
-	ret = add_extent(BTRFS_SUPER_INFO_OFFSET, BTRFS_SUPER_INFO_SIZE,
-			&metadump, 0);
-	if (ret) {
-		fprintf(stderr, "Error adding metadata %d\n", ret);
-		err = ret;
-		goto out;
-	}
-
-	path = btrfs_alloc_path();
-	if (!path) {
-		fprintf(stderr, "Out of memory allocating path\n");
-		err = -ENOMEM;
-		goto out;
-	}
-
-	if (walk_trees) {
-		ret = copy_tree_blocks(root, root->fs_info->chunk_root->node,
-				       &metadump, 1);
-		if (ret) {
-			err = ret;
-			goto out;
-		}
-
-		ret = copy_tree_blocks(root, root->fs_info->tree_root->node,
-				       &metadump, 1);
-		if (ret) {
-			err = ret;
-			goto out;
-		}
-	} else {
-		ret = copy_from_extent_tree(&metadump, path);
-		if (ret) {
-			err = ret;
-			goto out;
-		}
-	}
-
-	ret = copy_log_trees(root, &metadump, path);
-	if (ret) {
-		err = ret;
-		goto out;
-	}
-
-	ret = copy_space_cache(root, &metadump, path);
-out:
-	ret = flush_pending(&metadump, 1);
-	if (ret) {
-		if (!err)
-			err = ret;
-		fprintf(stderr, "Error flushing pending %d\n", ret);
-	}
-
-	metadump_destroy(&metadump, num_threads);
-
-	btrfs_free_path(path);
-	ret = close_ctree(root);
-	return err ? err : ret;
-}
-
-static void update_super_old(u8 *buffer)
-{
-	struct btrfs_super_block *super = (struct btrfs_super_block *)buffer;
-	struct btrfs_chunk *chunk;
-	struct btrfs_disk_key *key;
-	u32 sectorsize = btrfs_super_sectorsize(super);
-	u64 flags = btrfs_super_flags(super);
-
-	flags |= BTRFS_SUPER_FLAG_METADUMP;
-	btrfs_set_super_flags(super, flags);
-
-	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, (u64)-1);
-	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));
-	csum_block(buffer, BTRFS_SUPER_INFO_SIZE);
-}
-
-static int update_super(struct mdrestore_struct *mdres, u8 *buffer)
-{
-	struct btrfs_super_block *super = (struct btrfs_super_block *)buffer;
-	struct btrfs_chunk *chunk;
-	struct btrfs_disk_key *disk_key;
-	struct btrfs_key key;
-	u64 flags = btrfs_super_flags(super);
-	u32 new_array_size = 0;
-	u32 array_size;
-	u32 cur = 0;
-	u8 *ptr, *write_ptr;
-	int old_num_stripes;
-
-	write_ptr = ptr = super->sys_chunk_array;
-	array_size = btrfs_super_sys_array_size(super);
-
-	while (cur < array_size) {
-		disk_key = (struct btrfs_disk_key *)ptr;
-		btrfs_disk_key_to_cpu(&key, disk_key);
-
-		new_array_size += sizeof(*disk_key);
-		memmove(write_ptr, ptr, sizeof(*disk_key));
-
-		write_ptr += sizeof(*disk_key);
-		ptr += sizeof(*disk_key);
-		cur += sizeof(*disk_key);
-
-		if (key.type == BTRFS_CHUNK_ITEM_KEY) {
-			u64 type, physical, physical_dup, size = 0;
-
-			chunk = (struct btrfs_chunk *)ptr;
-			old_num_stripes = btrfs_stack_chunk_num_stripes(chunk);
-			chunk = (struct btrfs_chunk *)write_ptr;
-
-			memmove(write_ptr, ptr, sizeof(*chunk));
-			btrfs_set_stack_chunk_sub_stripes(chunk, 0);
-			type = btrfs_stack_chunk_type(chunk);
-			if (type & BTRFS_BLOCK_GROUP_DUP) {
-				new_array_size += sizeof(struct btrfs_stripe);
-				write_ptr += sizeof(struct btrfs_stripe);
-			} else {
-				btrfs_set_stack_chunk_num_stripes(chunk, 1);
-				btrfs_set_stack_chunk_type(chunk,
-						BTRFS_BLOCK_GROUP_SYSTEM);
-			}
-			chunk->stripe.devid = super->dev_item.devid;
-			physical = logical_to_physical(mdres, key.offset,
-						       &size, &physical_dup);
-			if (size != (u64)-1)
-				btrfs_set_stack_stripe_offset(&chunk->stripe,
-							      physical);
-			memcpy(chunk->stripe.dev_uuid, super->dev_item.uuid,
-			       BTRFS_UUID_SIZE);
-			new_array_size += sizeof(*chunk);
-		} else {
-			fprintf(stderr, "Bogus key in the sys chunk array "
-				"%d\n", key.type);
-			return -EIO;
-		}
-		write_ptr += sizeof(*chunk);
-		ptr += btrfs_chunk_item_size(old_num_stripes);
-		cur += btrfs_chunk_item_size(old_num_stripes);
-	}
-
-	if (mdres->clear_space_cache)
-		btrfs_set_super_cache_generation(super, 0);
-
-	flags |= BTRFS_SUPER_FLAG_METADUMP_V2;
-	btrfs_set_super_flags(super, flags);
-	btrfs_set_super_sys_array_size(super, new_array_size);
-	csum_block(buffer, BTRFS_SUPER_INFO_SIZE);
-
-	return 0;
-}
-
-static struct extent_buffer *alloc_dummy_eb(u64 bytenr, u32 size)
-{
-	struct extent_buffer *eb;
-
-	eb = calloc(1, sizeof(struct extent_buffer) + size);
-	if (!eb)
-		return NULL;
-
-	eb->start = bytenr;
-	eb->len = size;
-	return eb;
-}
-
-static void truncate_item(struct extent_buffer *eb, int slot, u32 new_size)
-{
-	struct btrfs_item *item;
-	u32 nritems;
-	u32 old_size;
-	u32 old_data_start;
-	u32 size_diff;
-	u32 data_end;
-	int i;
-
-	old_size = btrfs_item_size_nr(eb, slot);
-	if (old_size == new_size)
-		return;
-
-	nritems = btrfs_header_nritems(eb);
-	data_end = btrfs_item_offset_nr(eb, nritems - 1);
-
-	old_data_start = btrfs_item_offset_nr(eb, slot);
-	size_diff = old_size - new_size;
-
-	for (i = slot; i < nritems; i++) {
-		u32 ioff;
-		item = btrfs_item_nr(i);
-		ioff = btrfs_item_offset(eb, item);
-		btrfs_set_item_offset(eb, item, ioff + size_diff);
-	}
-
-	memmove_extent_buffer(eb, btrfs_leaf_data(eb) + data_end + size_diff,
-			      btrfs_leaf_data(eb) + data_end,
-			      old_data_start + new_size - data_end);
-	item = btrfs_item_nr(slot);
-	btrfs_set_item_size(eb, item, new_size);
-}
-
-static int fixup_chunk_tree_block(struct mdrestore_struct *mdres,
-				  struct async_work *async, u8 *buffer,
-				  size_t size)
-{
-	struct extent_buffer *eb;
-	size_t size_left = size;
-	u64 bytenr = async->start;
-	int i;
-
-	if (size_left % mdres->nodesize)
-		return 0;
-
-	eb = alloc_dummy_eb(bytenr, mdres->nodesize);
-	if (!eb)
-		return -ENOMEM;
-
-	while (size_left) {
-		eb->start = bytenr;
-		memcpy(eb->data, buffer, mdres->nodesize);
-
-		if (btrfs_header_bytenr(eb) != bytenr)
-			break;
-		if (memcmp(mdres->fsid,
-			   eb->data + offsetof(struct btrfs_header, fsid),
-			   BTRFS_FSID_SIZE))
-			break;
-
-		if (btrfs_header_owner(eb) != BTRFS_CHUNK_TREE_OBJECTID)
-			goto next;
-
-		if (btrfs_header_level(eb) != 0)
-			goto next;
-
-		for (i = 0; i < btrfs_header_nritems(eb); i++) {
-			struct btrfs_chunk *chunk;
-			struct btrfs_key key;
-			u64 type, physical, physical_dup, size = (u64)-1;
-
-			btrfs_item_key_to_cpu(eb, &key, i);
-			if (key.type != BTRFS_CHUNK_ITEM_KEY)
-				continue;
-
-			size = 0;
-			physical = logical_to_physical(mdres, key.offset,
-						       &size, &physical_dup);
-
-			if (!physical_dup)
-				truncate_item(eb, i, sizeof(*chunk));
-			chunk = btrfs_item_ptr(eb, i, struct btrfs_chunk);
-
-
-			/* Zero out the RAID profile */
-			type = btrfs_chunk_type(eb, chunk);
-			type &= (BTRFS_BLOCK_GROUP_DATA |
-				 BTRFS_BLOCK_GROUP_SYSTEM |
-				 BTRFS_BLOCK_GROUP_METADATA |
-				 BTRFS_BLOCK_GROUP_DUP);
-			btrfs_set_chunk_type(eb, chunk, type);
-
-			if (!physical_dup)
-				btrfs_set_chunk_num_stripes(eb, chunk, 1);
-			btrfs_set_chunk_sub_stripes(eb, chunk, 0);
-			btrfs_set_stripe_devid_nr(eb, chunk, 0, mdres->devid);
-			if (size != (u64)-1)
-				btrfs_set_stripe_offset_nr(eb, chunk, 0,
-							   physical);
-			/* update stripe 2 offset */
-			if (physical_dup)
-				btrfs_set_stripe_offset_nr(eb, chunk, 1,
-							   physical_dup);
-
-			write_extent_buffer(eb, mdres->uuid,
-					(unsigned long)btrfs_stripe_dev_uuid_nr(
-						chunk, 0),
-					BTRFS_UUID_SIZE);
-		}
-		memcpy(buffer, eb->data, eb->len);
-		csum_block(buffer, eb->len);
-next:
-		size_left -= mdres->nodesize;
-		buffer += mdres->nodesize;
-		bytenr += mdres->nodesize;
-	}
-
-	free(eb);
-	return 0;
-}
-
-static void write_backup_supers(int fd, u8 *buf)
-{
-	struct btrfs_super_block *super = (struct btrfs_super_block *)buf;
-	struct stat st;
-	u64 size;
-	u64 bytenr;
-	int i;
-	int ret;
-
-	if (fstat(fd, &st)) {
-		fprintf(stderr, "Couldn't stat restore point, won't be able "
-			"to write backup supers: %d\n", errno);
-		return;
-	}
-
-	size = btrfs_device_size(fd, &st);
-
-	for (i = 1; i < BTRFS_SUPER_MIRROR_MAX; i++) {
-		bytenr = btrfs_sb_offset(i);
-		if (bytenr + BTRFS_SUPER_INFO_SIZE > size)
-			break;
-		btrfs_set_super_bytenr(super, bytenr);
-		csum_block(buf, BTRFS_SUPER_INFO_SIZE);
-		ret = pwrite64(fd, buf, BTRFS_SUPER_INFO_SIZE, bytenr);
-		if (ret < BTRFS_SUPER_INFO_SIZE) {
-			if (ret < 0)
-				fprintf(stderr, "Problem writing out backup "
-					"super block %d, err %d\n", i, errno);
-			else
-				fprintf(stderr, "Short write writing out "
-					"backup super block\n");
-			break;
-		}
-	}
-}
-
-static void *restore_worker(void *data)
-{
-	struct mdrestore_struct *mdres = (struct mdrestore_struct *)data;
-	struct async_work *async;
-	size_t size;
-	u8 *buffer;
-	u8 *outbuf;
-	int outfd;
-	int ret;
-	int compress_size = MAX_PENDING_SIZE * 4;
-
-	outfd = fileno(mdres->out);
-	buffer = malloc(compress_size);
-	if (!buffer) {
-		fprintf(stderr, "Error allocating buffer\n");
-		pthread_mutex_lock(&mdres->mutex);
-		if (!mdres->error)
-			mdres->error = -ENOMEM;
-		pthread_mutex_unlock(&mdres->mutex);
-		pthread_exit(NULL);
-	}
-
-	while (1) {
-		u64 bytenr, physical_dup;
-		off_t offset = 0;
-		int err = 0;
-
-		pthread_mutex_lock(&mdres->mutex);
-		while (!mdres->nodesize || list_empty(&mdres->list)) {
-			if (mdres->done) {
-				pthread_mutex_unlock(&mdres->mutex);
-				goto out;
-			}
-			pthread_cond_wait(&mdres->cond, &mdres->mutex);
-		}
-		async = list_entry(mdres->list.next, struct async_work, list);
-		list_del_init(&async->list);
-		pthread_mutex_unlock(&mdres->mutex);
-
-		if (mdres->compress_method == COMPRESS_ZLIB) {
-			size = compress_size; 
-			ret = uncompress(buffer, (unsigned long *)&size,
-					 async->buffer, async->bufsize);
-			if (ret != Z_OK) {
-				fprintf(stderr, "Error decompressing %d\n",
-					ret);
-				err = -EIO;
-			}
-			outbuf = buffer;
-		} else {
-			outbuf = async->buffer;
-			size = async->bufsize;
-		}
-
-		if (!mdres->multi_devices) {
-			if (async->start == BTRFS_SUPER_INFO_OFFSET) {
-				if (mdres->old_restore) {
-					update_super_old(outbuf);
-				} else {
-					ret = update_super(mdres, outbuf);
-					if (ret)
-						err = ret;
-				}
-			} else if (!mdres->old_restore) {
-				ret = fixup_chunk_tree_block(mdres, async, outbuf, size);
-				if (ret)
-					err = ret;
-			}
-		}
-
-		if (!mdres->fixup_offset) {
-			while (size) {
-				u64 chunk_size = size;
-				physical_dup = 0;
-				if (!mdres->multi_devices && !mdres->old_restore)
-					bytenr = logical_to_physical(mdres,
-						     async->start + offset,
-						     &chunk_size,
-						     &physical_dup);
-				else
-					bytenr = async->start + offset;
-
-				ret = pwrite64(outfd, outbuf+offset, chunk_size,
-					       bytenr);
-				if (ret != chunk_size)
-					goto error;
-
-				if (physical_dup)
-					ret = pwrite64(outfd, outbuf+offset,
-						       chunk_size,
-						       physical_dup);
-				if (ret != chunk_size)
-					goto error;
-
-				size -= chunk_size;
-				offset += chunk_size;
-				continue;
-
-error:
-				if (ret < 0) {
-					fprintf(stderr, "Error writing to device %d\n",
-							errno);
-					err = errno;
-				} else {
-					fprintf(stderr, "Short write\n");
-					err = -EIO;
-				}
-			}
-		} else if (async->start != BTRFS_SUPER_INFO_OFFSET) {
-			ret = write_data_to_disk(mdres->info, outbuf, async->start, size, 0);
-			if (ret) {
-				printk("Error write data\n");
-				exit(1);
-			}
-		}
-
-
-		/* backup super blocks are already there at fixup_offset stage */
-		if (!mdres->multi_devices && async->start == BTRFS_SUPER_INFO_OFFSET)
-			write_backup_supers(outfd, outbuf);
-
-		pthread_mutex_lock(&mdres->mutex);
-		if (err && !mdres->error)
-			mdres->error = err;
-		mdres->num_items--;
-		pthread_mutex_unlock(&mdres->mutex);
-
-		free(async->buffer);
-		free(async);
-	}
-out:
-	free(buffer);
-	pthread_exit(NULL);
-}
-
-static void mdrestore_destroy(struct mdrestore_struct *mdres, int num_threads)
-{
-	struct rb_node *n;
-	int i;
-
-	while ((n = rb_first(&mdres->chunk_tree))) {
-		struct fs_chunk *entry;
-
-		entry = rb_entry(n, struct fs_chunk, l);
-		rb_erase(n, &mdres->chunk_tree);
-		rb_erase(&entry->p, &mdres->physical_tree);
-		free(entry);
-	}
-	pthread_mutex_lock(&mdres->mutex);
-	mdres->done = 1;
-	pthread_cond_broadcast(&mdres->cond);
-	pthread_mutex_unlock(&mdres->mutex);
-
-	for (i = 0; i < num_threads; i++)
-		pthread_join(mdres->threads[i], NULL);
-
-	pthread_cond_destroy(&mdres->cond);
-	pthread_mutex_destroy(&mdres->mutex);
-	free(mdres->threads);
-}
-
-static int mdrestore_init(struct mdrestore_struct *mdres,
-			  FILE *in, FILE *out, int old_restore,
-			  int num_threads, int fixup_offset,
-			  struct btrfs_fs_info *info, int multi_devices)
-{
-	int i, ret = 0;
-
-	memset(mdres, 0, sizeof(*mdres));
-	pthread_cond_init(&mdres->cond, NULL);
-	pthread_mutex_init(&mdres->mutex, NULL);
-	INIT_LIST_HEAD(&mdres->list);
-	INIT_LIST_HEAD(&mdres->overlapping_chunks);
-	mdres->in = in;
-	mdres->out = out;
-	mdres->old_restore = old_restore;
-	mdres->chunk_tree.rb_node = NULL;
-	mdres->fixup_offset = fixup_offset;
-	mdres->info = info;
-	mdres->multi_devices = multi_devices;
-	mdres->clear_space_cache = 0;
-	mdres->last_physical_offset = 0;
-	mdres->alloced_chunks = 0;
-
-	if (!num_threads)
-		return 0;
-
-	mdres->num_threads = num_threads;
-	mdres->threads = calloc(num_threads, sizeof(pthread_t));
-	if (!mdres->threads)
-		return -ENOMEM;
-	for (i = 0; i < num_threads; i++) {
-		ret = pthread_create(mdres->threads + i, NULL, restore_worker,
-				     mdres);
-		if (ret)
-			break;
-	}
-	if (ret)
-		mdrestore_destroy(mdres, i + 1);
-	return ret;
-}
-
-static int fill_mdres_info(struct mdrestore_struct *mdres,
-			   struct async_work *async)
-{
-	struct btrfs_super_block *super;
-	u8 *buffer = NULL;
-	u8 *outbuf;
-	int ret;
-
-	/* We've already been initialized */
-	if (mdres->nodesize)
-		return 0;
-
-	if (mdres->compress_method == COMPRESS_ZLIB) {
-		size_t size = MAX_PENDING_SIZE * 2;
-
-		buffer = malloc(MAX_PENDING_SIZE * 2);
-		if (!buffer)
-			return -ENOMEM;
-		ret = uncompress(buffer, (unsigned long *)&size,
-				 async->buffer, async->bufsize);
-		if (ret != Z_OK) {
-			fprintf(stderr, "Error decompressing %d\n", ret);
-			free(buffer);
-			return -EIO;
-		}
-		outbuf = buffer;
-	} else {
-		outbuf = async->buffer;
-	}
-
-	super = (struct btrfs_super_block *)outbuf;
-	mdres->nodesize = btrfs_super_nodesize(super);
-	memcpy(mdres->fsid, super->fsid, BTRFS_FSID_SIZE);
-	memcpy(mdres->uuid, super->dev_item.uuid,
-		       BTRFS_UUID_SIZE);
-	mdres->devid = le64_to_cpu(super->dev_item.devid);
-	free(buffer);
-	return 0;
-}
-
-static int add_cluster(struct meta_cluster *cluster,
-		       struct mdrestore_struct *mdres, u64 *next)
-{
-	struct meta_cluster_item *item;
-	struct meta_cluster_header *header = &cluster->header;
-	struct async_work *async;
-	u64 bytenr;
-	u32 i, nritems;
-	int ret;
-
-	mdres->compress_method = header->compress;
-
-	bytenr = le64_to_cpu(header->bytenr) + BLOCK_SIZE;
-	nritems = le32_to_cpu(header->nritems);
-	for (i = 0; i < nritems; i++) {
-		item = &cluster->items[i];
-		async = calloc(1, sizeof(*async));
-		if (!async) {
-			fprintf(stderr, "Error allocating async\n");
-			return -ENOMEM;
-		}
-		async->start = le64_to_cpu(item->bytenr);
-		async->bufsize = le32_to_cpu(item->size);
-		async->buffer = malloc(async->bufsize);
-		if (!async->buffer) {
-			fprintf(stderr, "Error allocating async buffer\n");
-			free(async);
-			return -ENOMEM;
-		}
-		ret = fread(async->buffer, async->bufsize, 1, mdres->in);
-		if (ret != 1) {
-			fprintf(stderr, "Error reading buffer %d\n", errno);
-			free(async->buffer);
-			free(async);
-			return -EIO;
-		}
-		bytenr += async->bufsize;
-
-		pthread_mutex_lock(&mdres->mutex);
-		if (async->start == BTRFS_SUPER_INFO_OFFSET) {
-			ret = fill_mdres_info(mdres, async);
-			if (ret) {
-				fprintf(stderr, "Error setting up restore\n");
-				pthread_mutex_unlock(&mdres->mutex);
-				free(async->buffer);
-				free(async);
-				return ret;
-			}
-		}
-		list_add_tail(&async->list, &mdres->list);
-		mdres->num_items++;
-		pthread_cond_signal(&mdres->cond);
-		pthread_mutex_unlock(&mdres->mutex);
-	}
-	if (bytenr & BLOCK_MASK) {
-		char buffer[BLOCK_MASK];
-		size_t size = BLOCK_SIZE - (bytenr & BLOCK_MASK);
-
-		bytenr += size;
-		ret = fread(buffer, size, 1, mdres->in);
-		if (ret != 1) {
-			fprintf(stderr, "Error reading in buffer %d\n", errno);
-			return -EIO;
-		}
-	}
-	*next = bytenr;
-	return 0;
-}
-
-static int wait_for_worker(struct mdrestore_struct *mdres)
-{
-	int ret = 0;
-
-	pthread_mutex_lock(&mdres->mutex);
-	ret = mdres->error;
-	while (!ret && mdres->num_items > 0) {
-		struct timespec ts = {
-			.tv_sec = 0,
-			.tv_nsec = 10000000,
-		};
-		pthread_mutex_unlock(&mdres->mutex);
-		nanosleep(&ts, NULL);
-		pthread_mutex_lock(&mdres->mutex);
-		ret = mdres->error;
-	}
-	pthread_mutex_unlock(&mdres->mutex);
-	return ret;
-}
-
-static int read_chunk_block(struct mdrestore_struct *mdres, u8 *buffer,
-			    u64 bytenr, u64 item_bytenr, u32 bufsize,
-			    u64 cluster_bytenr)
-{
-	struct extent_buffer *eb;
-	int ret = 0;
-	int i;
-
-	eb = alloc_dummy_eb(bytenr, mdres->nodesize);
-	if (!eb) {
-		ret = -ENOMEM;
-		goto out;
-	}
-
-	while (item_bytenr != bytenr) {
-		buffer += mdres->nodesize;
-		item_bytenr += mdres->nodesize;
-	}
-
-	memcpy(eb->data, buffer, mdres->nodesize);
-	if (btrfs_header_bytenr(eb) != bytenr) {
-		fprintf(stderr, "Eb bytenr doesn't match found bytenr\n");
-		ret = -EIO;
-		goto out;
-	}
-
-	if (memcmp(mdres->fsid, eb->data + offsetof(struct btrfs_header, fsid),
-		   BTRFS_FSID_SIZE)) {
-		fprintf(stderr, "Fsid doesn't match\n");
-		ret = -EIO;
-		goto out;
-	}
-
-	if (btrfs_header_owner(eb) != BTRFS_CHUNK_TREE_OBJECTID) {
-		fprintf(stderr, "Does not belong to the chunk tree\n");
-		ret = -EIO;
-		goto out;
-	}
-
-	for (i = 0; i < btrfs_header_nritems(eb); i++) {
-		struct btrfs_chunk *chunk;
-		struct fs_chunk *fs_chunk;
-		struct btrfs_key key;
-		u64 type;
-
-		if (btrfs_header_level(eb)) {
-			u64 blockptr = btrfs_node_blockptr(eb, i);
-
-			ret = search_for_chunk_blocks(mdres, blockptr,
-						      cluster_bytenr);
-			if (ret)
-				break;
-			continue;
-		}
-
-		/* Yay a leaf!  We loves leafs! */
-		btrfs_item_key_to_cpu(eb, &key, i);
-		if (key.type != BTRFS_CHUNK_ITEM_KEY)
-			continue;
-
-		fs_chunk = malloc(sizeof(struct fs_chunk));
-		if (!fs_chunk) {
-			fprintf(stderr, "Error allocating chunk\n");
-			ret = -ENOMEM;
-			break;
-		}
-		memset(fs_chunk, 0, sizeof(*fs_chunk));
-		chunk = btrfs_item_ptr(eb, i, struct btrfs_chunk);
-
-		fs_chunk->logical = key.offset;
-		fs_chunk->physical = btrfs_stripe_offset_nr(eb, chunk, 0);
-		fs_chunk->bytes = btrfs_chunk_length(eb, chunk);
-		INIT_LIST_HEAD(&fs_chunk->list);
-		if (tree_search(&mdres->physical_tree, &fs_chunk->p,
-				physical_cmp, 1) != NULL)
-			list_add(&fs_chunk->list, &mdres->overlapping_chunks);
-		else
-			tree_insert(&mdres->physical_tree, &fs_chunk->p,
-				    physical_cmp);
-
-		type = btrfs_chunk_type(eb, chunk);
-		if (type & BTRFS_BLOCK_GROUP_DUP) {
-			fs_chunk->physical_dup =
-					btrfs_stripe_offset_nr(eb, chunk, 1);
-		}
-
-		if (fs_chunk->physical_dup + fs_chunk->bytes >
-		    mdres->last_physical_offset)
-			mdres->last_physical_offset = fs_chunk->physical_dup +
-				fs_chunk->bytes;
-		else if (fs_chunk->physical + fs_chunk->bytes >
-		    mdres->last_physical_offset)
-			mdres->last_physical_offset = fs_chunk->physical +
-				fs_chunk->bytes;
-		mdres->alloced_chunks += fs_chunk->bytes;
-		/* in dup case, fs_chunk->bytes should add twice */
-		if (fs_chunk->physical_dup)
-			mdres->alloced_chunks += fs_chunk->bytes;
-		tree_insert(&mdres->chunk_tree, &fs_chunk->l, chunk_cmp);
-	}
-out:
-	free(eb);
-	return ret;
-}
-
-/* If you have to ask you aren't worthy */
-static int search_for_chunk_blocks(struct mdrestore_struct *mdres,
-				   u64 search, u64 cluster_bytenr)
-{
-	struct meta_cluster *cluster;
-	struct meta_cluster_header *header;
-	struct meta_cluster_item *item;
-	u64 current_cluster = cluster_bytenr, bytenr;
-	u64 item_bytenr;
-	u32 bufsize, nritems, i;
-	u32 max_size = MAX_PENDING_SIZE * 2;
-	u8 *buffer, *tmp = NULL;
-	int ret = 0;
-
-	cluster = malloc(BLOCK_SIZE);
-	if (!cluster) {
-		fprintf(stderr, "Error allocating cluster\n");
-		return -ENOMEM;
-	}
-
-	buffer = malloc(max_size);
-	if (!buffer) {
-		fprintf(stderr, "Error allocating buffer\n");
-		free(cluster);
-		return -ENOMEM;
-	}
-
-	if (mdres->compress_method == COMPRESS_ZLIB) {
-		tmp = malloc(max_size);
-		if (!tmp) {
-			fprintf(stderr, "Error allocating tmp buffer\n");
-			free(cluster);
-			free(buffer);
-			return -ENOMEM;
-		}
-	}
-
-	bytenr = current_cluster;
-	while (1) {
-		if (fseek(mdres->in, current_cluster, SEEK_SET)) {
-			fprintf(stderr, "Error seeking: %d\n", errno);
-			ret = -EIO;
-			break;
-		}
-
-		ret = fread(cluster, BLOCK_SIZE, 1, mdres->in);
-		if (ret == 0) {
-			if (cluster_bytenr != 0) {
-				cluster_bytenr = 0;
-				current_cluster = 0;
-				bytenr = 0;
-				continue;
-			}
-			printf("ok this is where we screwed up?\n");
-			ret = -EIO;
-			break;
-		} else if (ret < 0) {
-			fprintf(stderr, "Error reading image\n");
-			break;
-		}
-		ret = 0;
-
-		header = &cluster->header;
-		if (le64_to_cpu(header->magic) != HEADER_MAGIC ||
-		    le64_to_cpu(header->bytenr) != current_cluster) {
-			fprintf(stderr, "bad header in metadump image\n");
-			ret = -EIO;
-			break;
-		}
-
-		bytenr += BLOCK_SIZE;
-		nritems = le32_to_cpu(header->nritems);
-		for (i = 0; i < nritems; i++) {
-			size_t size;
-
-			item = &cluster->items[i];
-			bufsize = le32_to_cpu(item->size);
-			item_bytenr = le64_to_cpu(item->bytenr);
-
-			if (bufsize > max_size) {
-				fprintf(stderr, "item %u size %u too big\n",
-					i, bufsize);
-				ret = -EIO;
-				break;
-			}
-
-			if (mdres->compress_method == COMPRESS_ZLIB) {
-				ret = fread(tmp, bufsize, 1, mdres->in);
-				if (ret != 1) {
-					fprintf(stderr, "Error reading: %d\n",
-						errno);
-					ret = -EIO;
-					break;
-				}
-
-				size = max_size;
-				ret = uncompress(buffer,
-						 (unsigned long *)&size, tmp,
-						 bufsize);
-				if (ret != Z_OK) {
-					fprintf(stderr, "Error decompressing "
-						"%d\n", ret);
-					ret = -EIO;
-					break;
-				}
-			} else {
-				ret = fread(buffer, bufsize, 1, mdres->in);
-				if (ret != 1) {
-					fprintf(stderr, "Error reading: %d\n",
-						errno);
-					ret = -EIO;
-					break;
-				}
-				size = bufsize;
-			}
-			ret = 0;
-
-			if (item_bytenr <= search &&
-			    item_bytenr + size > search) {
-				ret = read_chunk_block(mdres, buffer, search,
-						       item_bytenr, size,
-						       current_cluster);
-				if (!ret)
-					ret = 1;
-				break;
-			}
-			bytenr += bufsize;
-		}
-		if (ret) {
-			if (ret > 0)
-				ret = 0;
-			break;
-		}
-		if (bytenr & BLOCK_MASK)
-			bytenr += BLOCK_SIZE - (bytenr & BLOCK_MASK);
-		current_cluster = bytenr;
-	}
-
-	free(tmp);
-	free(buffer);
-	free(cluster);
-	return ret;
-}
-
-static int build_chunk_tree(struct mdrestore_struct *mdres,
-			    struct meta_cluster *cluster)
-{
-	struct btrfs_super_block *super;
-	struct meta_cluster_header *header;
-	struct meta_cluster_item *item = NULL;
-	u64 chunk_root_bytenr = 0;
-	u32 i, nritems;
-	u64 bytenr = 0;
-	u8 *buffer;
-	int ret;
-
-	/* We can't seek with stdin so don't bother doing this */
-	if (mdres->in == stdin)
-		return 0;
-
-	ret = fread(cluster, BLOCK_SIZE, 1, mdres->in);
-	if (ret <= 0) {
-		fprintf(stderr, "Error reading in cluster: %d\n", errno);
-		return -EIO;
-	}
-	ret = 0;
-
-	header = &cluster->header;
-	if (le64_to_cpu(header->magic) != HEADER_MAGIC ||
-	    le64_to_cpu(header->bytenr) != 0) {
-		fprintf(stderr, "bad header in metadump image\n");
-		return -EIO;
-	}
-
-	bytenr += BLOCK_SIZE;
-	mdres->compress_method = header->compress;
-	nritems = le32_to_cpu(header->nritems);
-	for (i = 0; i < nritems; i++) {
-		item = &cluster->items[i];
-
-		if (le64_to_cpu(item->bytenr) == BTRFS_SUPER_INFO_OFFSET)
-			break;
-		bytenr += le32_to_cpu(item->size);
-		if (fseek(mdres->in, le32_to_cpu(item->size), SEEK_CUR)) {
-			fprintf(stderr, "Error seeking: %d\n", errno);
-			return -EIO;
-		}
-	}
-
-	if (!item || le64_to_cpu(item->bytenr) != BTRFS_SUPER_INFO_OFFSET) {
-		fprintf(stderr, "Huh, didn't find the super?\n");
-		return -EINVAL;
-	}
-
-	buffer = malloc(le32_to_cpu(item->size));
-	if (!buffer) {
-		fprintf(stderr, "Error allocating buffer\n");
-		return -ENOMEM;
-	}
-
-	ret = fread(buffer, le32_to_cpu(item->size), 1, mdres->in);
-	if (ret != 1) {
-		fprintf(stderr, "Error reading buffer: %d\n", errno);
-		free(buffer);
-		return -EIO;
-	}
-
-	if (mdres->compress_method == COMPRESS_ZLIB) {
-		size_t size = MAX_PENDING_SIZE * 2;
-		u8 *tmp;
-
-		tmp = malloc(MAX_PENDING_SIZE * 2);
-		if (!tmp) {
-			free(buffer);
-			return -ENOMEM;
-		}
-		ret = uncompress(tmp, (unsigned long *)&size,
-				 buffer, le32_to_cpu(item->size));
-		if (ret != Z_OK) {
-			fprintf(stderr, "Error decompressing %d\n", ret);
-			free(buffer);
-			free(tmp);
-			return -EIO;
-		}
-		free(buffer);
-		buffer = tmp;
-	}
-
-	pthread_mutex_lock(&mdres->mutex);
-	super = (struct btrfs_super_block *)buffer;
-	chunk_root_bytenr = btrfs_super_chunk_root(super);
-	mdres->nodesize = btrfs_super_nodesize(super);
-	memcpy(mdres->fsid, super->fsid, BTRFS_FSID_SIZE);
-	memcpy(mdres->uuid, super->dev_item.uuid,
-		       BTRFS_UUID_SIZE);
-	mdres->devid = le64_to_cpu(super->dev_item.devid);
-	free(buffer);
-	pthread_mutex_unlock(&mdres->mutex);
-
-	return search_for_chunk_blocks(mdres, chunk_root_bytenr, 0);
-}
-
-static int range_contains_super(u64 physical, u64 bytes)
-{
-	u64 super_bytenr;
-	int i;
-
-	for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
-		super_bytenr = btrfs_sb_offset(i);
-		if (super_bytenr >= physical &&
-		    super_bytenr < physical + bytes)
-			return 1;
-	}
-
-	return 0;
-}
-
-static void remap_overlapping_chunks(struct mdrestore_struct *mdres)
-{
-	struct fs_chunk *fs_chunk;
-
-	while (!list_empty(&mdres->overlapping_chunks)) {
-		fs_chunk = list_first_entry(&mdres->overlapping_chunks,
-					    struct fs_chunk, list);
-		list_del_init(&fs_chunk->list);
-		if (range_contains_super(fs_chunk->physical,
-					 fs_chunk->bytes)) {
-			fprintf(stderr, "Remapping a chunk that had a super "
-				"mirror inside of it, clearing space cache "
-				"so we don't end up with corruption\n");
-			mdres->clear_space_cache = 1;
-		}
-		fs_chunk->physical = mdres->last_physical_offset;
-		tree_insert(&mdres->physical_tree, &fs_chunk->p, physical_cmp);
-		mdres->last_physical_offset += fs_chunk->bytes;
-	}
-}
-
-static int fixup_devices(struct btrfs_fs_info *fs_info,
-			 struct mdrestore_struct *mdres, off_t dev_size)
-{
-	struct btrfs_trans_handle *trans;
-	struct btrfs_dev_item *dev_item;
-	struct btrfs_path *path;
-	struct extent_buffer *leaf;
-	struct btrfs_root *root = fs_info->chunk_root;
-	struct btrfs_key key;
-	u64 devid, cur_devid;
-	int ret;
-
-	path = btrfs_alloc_path();
-	if (!path) {
-		fprintf(stderr, "Error allocating path\n");
-		return -ENOMEM;
-	}
-
-	trans = btrfs_start_transaction(fs_info->tree_root, 1);
-	if (IS_ERR(trans)) {
-		fprintf(stderr, "Error starting transaction %ld\n",
-			PTR_ERR(trans));
-		btrfs_free_path(path);
-		return PTR_ERR(trans);
-	}
-
-	dev_item = &fs_info->super_copy->dev_item;
-
-	devid = btrfs_stack_device_id(dev_item);
-
-	btrfs_set_stack_device_total_bytes(dev_item, dev_size);
-	btrfs_set_stack_device_bytes_used(dev_item, mdres->alloced_chunks);
-
-	key.objectid = BTRFS_DEV_ITEMS_OBJECTID;
-	key.type = BTRFS_DEV_ITEM_KEY;
-	key.offset = 0;
-
-again:
-	ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
-	if (ret < 0) {
-		fprintf(stderr, "search failed %d\n", ret);
-		exit(1);
-	}
-
-	while (1) {
-		leaf = path->nodes[0];
-		if (path->slots[0] >= btrfs_header_nritems(leaf)) {
-			ret = btrfs_next_leaf(root, path);
-			if (ret < 0) {
-				fprintf(stderr, "Error going to next leaf "
-					"%d\n", ret);
-				exit(1);
-			}
-			if (ret > 0) {
-				ret = 0;
-				break;
-			}
-			leaf = path->nodes[0];
-		}
-
-		btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
-		if (key.type > BTRFS_DEV_ITEM_KEY)
-			break;
-		if (key.type != BTRFS_DEV_ITEM_KEY) {
-			path->slots[0]++;
-			continue;
-		}
-
-		dev_item = btrfs_item_ptr(leaf, path->slots[0],
-					  struct btrfs_dev_item);
-		cur_devid = btrfs_device_id(leaf, dev_item);
-		if (devid != cur_devid) {
-			ret = btrfs_del_item(trans, root, path);
-			if (ret) {
-				fprintf(stderr, "Error deleting item %d\n",
-					ret);
-				exit(1);
-			}
-			btrfs_release_path(path);
-			goto again;
-		}
-
-		btrfs_set_device_total_bytes(leaf, dev_item, dev_size);
-		btrfs_set_device_bytes_used(leaf, dev_item,
-					    mdres->alloced_chunks);
-		btrfs_mark_buffer_dirty(leaf);
-		path->slots[0]++;
-	}
-
-	btrfs_free_path(path);
-	ret = btrfs_commit_transaction(trans, fs_info->tree_root);
-	if (ret) {
-		fprintf(stderr, "Commit failed %d\n", ret);
-		return ret;
-	}
-	return 0;
-}
-
-static int restore_metadump(const char *input, FILE *out, int old_restore,
-			    int num_threads, int fixup_offset,
-			    const char *target, int multi_devices)
-{
-	struct meta_cluster *cluster = NULL;
-	struct meta_cluster_header *header;
-	struct mdrestore_struct mdrestore;
-	struct btrfs_fs_info *info = NULL;
-	u64 bytenr = 0;
-	FILE *in = NULL;
-	int ret = 0;
-
-	if (!strcmp(input, "-")) {
-		in = stdin;
-	} else {
-		in = fopen(input, "r");
-		if (!in) {
-			perror("unable to open metadump image");
-			return 1;
-		}
-	}
-
-	/* NOTE: open with write mode */
-	if (fixup_offset) {
-		BUG_ON(!target);
-		info = open_ctree_fs_info(target, 0, 0, 0,
-					  OPEN_CTREE_WRITES |
-					  OPEN_CTREE_RESTORE |
-					  OPEN_CTREE_PARTIAL);
-		if (!info) {
-			fprintf(stderr, "%s: open ctree failed\n", __func__);
-			ret = -EIO;
-			goto failed_open;
-		}
-	}
-
-	cluster = malloc(BLOCK_SIZE);
-	if (!cluster) {
-		fprintf(stderr, "Error allocating cluster\n");
-		ret = -ENOMEM;
-		goto failed_info;
-	}
-
-	ret = mdrestore_init(&mdrestore, in, out, old_restore, num_threads,
-			     fixup_offset, info, multi_devices);
-	if (ret) {
-		fprintf(stderr, "Error initializing mdrestore %d\n", ret);
-		goto failed_cluster;
-	}
-
-	if (!multi_devices && !old_restore) {
-		ret = build_chunk_tree(&mdrestore, cluster);
-		if (ret)
-			goto out;
-		if (!list_empty(&mdrestore.overlapping_chunks))
-			remap_overlapping_chunks(&mdrestore);
-	}
-
-	if (in != stdin && fseek(in, 0, SEEK_SET)) {
-		fprintf(stderr, "Error seeking %d\n", errno);
-		goto out;
-	}
-
-	while (!mdrestore.error) {
-		ret = fread(cluster, BLOCK_SIZE, 1, in);
-		if (!ret)
-			break;
-
-		header = &cluster->header;
-		if (le64_to_cpu(header->magic) != HEADER_MAGIC ||
-		    le64_to_cpu(header->bytenr) != bytenr) {
-			fprintf(stderr, "bad header in metadump image\n");
-			ret = -EIO;
-			break;
-		}
-		ret = add_cluster(cluster, &mdrestore, &bytenr);
-		if (ret) {
-			fprintf(stderr, "Error adding cluster\n");
-			break;
-		}
-	}
-	ret = wait_for_worker(&mdrestore);
-
-	if (!ret && !multi_devices && !old_restore) {
-		struct btrfs_root *root;
-		struct stat st;
-
-		root = open_ctree_fd(fileno(out), target, 0,
-					  OPEN_CTREE_PARTIAL |
-					  OPEN_CTREE_WRITES |
-					  OPEN_CTREE_NO_DEVICES);
-		if (!root) {
-			fprintf(stderr, "unable to open %s\n", target);
-			ret = -EIO;
-			goto out;
-		}
-		info = root->fs_info;
-
-		if (stat(target, &st)) {
-			fprintf(stderr, "statting %s failed\n", target);
-			close_ctree(info->chunk_root);
-			free(cluster);
-			return 1;
-		}
-
-		ret = fixup_devices(info, &mdrestore, st.st_size);
-		close_ctree(info->chunk_root);
-		if (ret)
-			goto out;
-	}
-out:
-	mdrestore_destroy(&mdrestore, num_threads);
-failed_cluster:
-	free(cluster);
-failed_info:
-	if (fixup_offset && info)
-		close_ctree(info->chunk_root);
-failed_open:
-	if (in != stdin)
-		fclose(in);
-	return ret;
-}
-
-static int update_disk_super_on_device(struct btrfs_fs_info *info,
-				       const char *other_dev, u64 cur_devid)
-{
-	struct btrfs_key key;
-	struct extent_buffer *leaf;
-	struct btrfs_path path;
-	struct btrfs_dev_item *dev_item;
-	struct btrfs_super_block *disk_super;
-	char dev_uuid[BTRFS_UUID_SIZE];
-	char fs_uuid[BTRFS_UUID_SIZE];
-	u64 devid, type, io_align, io_width;
-	u64 sector_size, total_bytes, bytes_used;
-	char buf[BTRFS_SUPER_INFO_SIZE];
-	int fp = -1;
-	int ret;
-
-	key.objectid = BTRFS_DEV_ITEMS_OBJECTID;
-	key.type = BTRFS_DEV_ITEM_KEY;
-	key.offset = cur_devid;
-
-	btrfs_init_path(&path);
-	ret = btrfs_search_slot(NULL, info->chunk_root, &key, &path, 0, 0); 
-	if (ret) {
-		fprintf(stderr, "ERROR: search key failed\n");
-		ret = -EIO;
-		goto out;
-	}
-
-	leaf = path.nodes[0];
-	dev_item = btrfs_item_ptr(leaf, path.slots[0],
-				  struct btrfs_dev_item);
-
-	devid = btrfs_device_id(leaf, dev_item);
-	if (devid != cur_devid) {
-		printk("ERROR: devid %llu mismatch with %llu\n", devid, cur_devid);
-		ret = -EIO;
-		goto out;
-	}
-
-	type = btrfs_device_type(leaf, dev_item);
-	io_align = btrfs_device_io_align(leaf, dev_item);
-	io_width = btrfs_device_io_width(leaf, dev_item);
-	sector_size = btrfs_device_sector_size(leaf, dev_item);
-	total_bytes = btrfs_device_total_bytes(leaf, dev_item);
-	bytes_used = btrfs_device_bytes_used(leaf, dev_item);
-	read_extent_buffer(leaf, dev_uuid, (unsigned long)btrfs_device_uuid(dev_item), BTRFS_UUID_SIZE);
-	read_extent_buffer(leaf, fs_uuid, (unsigned long)btrfs_device_fsid(dev_item), BTRFS_UUID_SIZE);
-
-	btrfs_release_path(&path);
-
-	printk("update disk super on %s devid=%llu\n", other_dev, devid);
-
-	/* update other devices' super block */
-	fp = open(other_dev, O_CREAT | O_RDWR, 0600);
-	if (fp < 0) {
-		fprintf(stderr, "ERROR: could not open %s\n", other_dev);
-		ret = -EIO;
-		goto out;
-	}
-
-	memcpy(buf, info->super_copy, BTRFS_SUPER_INFO_SIZE);
-
-	disk_super = (struct btrfs_super_block *)buf;
-	dev_item = &disk_super->dev_item;
-
-	btrfs_set_stack_device_type(dev_item, type);
-	btrfs_set_stack_device_id(dev_item, devid);
-	btrfs_set_stack_device_total_bytes(dev_item, total_bytes);
-	btrfs_set_stack_device_bytes_used(dev_item, bytes_used);
-	btrfs_set_stack_device_io_align(dev_item, io_align);
-	btrfs_set_stack_device_io_width(dev_item, io_width);
-	btrfs_set_stack_device_sector_size(dev_item, sector_size);
-	memcpy(dev_item->uuid, dev_uuid, BTRFS_UUID_SIZE);
-	memcpy(dev_item->fsid, fs_uuid, BTRFS_UUID_SIZE);
-	csum_block((u8 *)buf, BTRFS_SUPER_INFO_SIZE);
-
-	ret = pwrite64(fp, buf, BTRFS_SUPER_INFO_SIZE, BTRFS_SUPER_INFO_OFFSET);
-	if (ret != BTRFS_SUPER_INFO_SIZE) {
-		if (ret < 0)
-			fprintf(stderr, "ERROR: cannot write superblock: %s\n", strerror(ret));
-		else
-			fprintf(stderr, "ERROR: cannot write superblock\n");
-		ret = -EIO;
-		goto out;
-	}
-
-	write_backup_supers(fp, (u8 *)buf);
-
-out:
-	if (fp != -1)
-		close(fp);
-	return ret;
-}
-
-static void print_usage(int ret)
-{
-	printf("usage: btrfs-image [options] source target\n");
-	printf("\t-r      \trestore metadump image\n");
-	printf("\t-c value\tcompression level (0 ~ 9)\n");
-	printf("\t-t value\tnumber of threads (1 ~ 32)\n");
-	printf("\t-o      \tdon't mess with the chunk tree when restoring\n");
-	printf("\t-s      \tsanitize file names, use once to just use garbage, use twice if you want crc collisions\n");
-	printf("\t-w      \twalk all trees instead of using extent tree, do this if your extent tree is broken\n");
-	printf("\t-m	   \trestore for multiple devices\n");
-	printf("\n");
-	printf("\tIn the dump mode, source is the btrfs device and target is the output file (use '-' for stdout).\n");
-	printf("\tIn the restore mode, source is the dumped image and target is the btrfs device/file.\n");
-	exit(ret);
-}
-
-int main(int argc, char *argv[])
-{
-	char *source;
-	char *target;
-	u64 num_threads = 0;
-	u64 compress_level = 0;
-	int create = 1;
-	int old_restore = 0;
-	int walk_trees = 0;
-	int multi_devices = 0;
-	int ret;
-	int sanitize = 0;
-	int dev_cnt = 0;
-	int usage_error = 0;
-	FILE *out;
-
-	while (1) {
-		static const struct option long_options[] = {
-			{ "help", no_argument, NULL, GETOPT_VAL_HELP},
-			{ NULL, 0, NULL, 0 }
-		};
-		int c = getopt_long(argc, argv, "rc:t:oswm", long_options, NULL);
-		if (c < 0)
-			break;
-		switch (c) {
-		case 'r':
-			create = 0;
-			break;
-		case 't':
-			num_threads = arg_strtou64(optarg);
-			if (num_threads > 32) {
-				error("number of threads out of range: %llu",
-					(unsigned long long)num_threads);
-				return 1;
-			}
-			break;
-		case 'c':
-			compress_level = arg_strtou64(optarg);
-			if (compress_level > 9) {
-				error("compression level out of range: %llu",
-					(unsigned long long)compress_level);
-				return 1;
-			}
-			break;
-		case 'o':
-			old_restore = 1;
-			break;
-		case 's':
-			sanitize++;
-			break;
-		case 'w':
-			walk_trees = 1;
-			break;
-		case 'm':
-			create = 0;
-			multi_devices = 1;
-			break;
-			case GETOPT_VAL_HELP:
-		default:
-			print_usage(c != GETOPT_VAL_HELP);
-		}
-	}
-
-	set_argv0(argv);
-	if (check_argc_min(argc - optind, 2))
-		print_usage(1);
-
-	dev_cnt = argc - optind - 1;
-
-	if (create) {
-		if (old_restore) {
-			fprintf(stderr, "Usage error: create and restore cannot be used at the same time\n");
-			usage_error++;
-		}
-	} else {
-		if (walk_trees || sanitize || compress_level) {
-			fprintf(stderr, "Usage error: use -w, -s, -c options for restore makes no sense\n");
-			usage_error++;
-		}
-		if (multi_devices && dev_cnt < 2) {
-			fprintf(stderr, "Usage error: not enough devices specified for -m option\n");
-			usage_error++;
-		}
-		if (!multi_devices && dev_cnt != 1) {
-			fprintf(stderr, "Usage error: accepts only 1 device without -m option\n");
-			usage_error++;
-		}
-	}
-
-	if (usage_error)
-		print_usage(1);
-
-	source = argv[optind];
-	target = argv[optind + 1];
-
-	if (create && !strcmp(target, "-")) {
-		out = stdout;
-	} else {
-		out = fopen(target, "w+");
-		if (!out) {
-			perror("unable to create target file");
-			exit(1);
-		}
-	}
-
-	if (compress_level > 0 || create == 0) {
-		if (num_threads == 0) {
-			long tmp = sysconf(_SC_NPROCESSORS_ONLN);
-
-			if (tmp <= 0)
-				tmp = 1;
-			num_threads = tmp;
-		}
-	} else {
-		num_threads = 0;
-	}
-
-	if (create) {
-		ret = check_mounted(source);
-		if (ret < 0) {
-			fprintf(stderr, "Could not check mount status: %s\n",
-				strerror(-ret));
-			exit(1);
-		} else if (ret)
-			fprintf(stderr,
-		"WARNING: The device is mounted. Make sure the filesystem is quiescent.\n");
-
-		ret = create_metadump(source, out, num_threads,
-				      compress_level, sanitize, walk_trees);
-	} else {
-		ret = restore_metadump(source, out, old_restore, num_threads,
-				       0, target, multi_devices);
-	}
-	if (ret) {
-		printk("%s failed (%s)\n", (create) ? "create" : "restore",
-		       strerror(errno));
-		goto out;
-	}
-
-	 /* extended support for multiple devices */
-	if (!create && multi_devices) {
-		struct btrfs_fs_info *info;
-		u64 total_devs;
-		int i;
-
-		info = open_ctree_fs_info(target, 0, 0, 0,
-					  OPEN_CTREE_PARTIAL |
-					  OPEN_CTREE_RESTORE);
-		if (!info) {
-			fprintf(stderr, "unable to open %s error = %s\n",
-				target, strerror(errno));
-			return 1;
-		}
-
-		total_devs = btrfs_super_num_devices(info->super_copy);
-		if (total_devs != dev_cnt) {
-			printk("it needs %llu devices but has only %d\n",
-				total_devs, dev_cnt);
-			close_ctree(info->chunk_root);
-			goto out;
-		}
-
-		/* update super block on other disks */
-		for (i = 2; i <= dev_cnt; i++) {
-			ret = update_disk_super_on_device(info,
-					argv[optind + i], (u64)i);
-			if (ret) {
-				printk("update disk super failed devid=%d (error=%d)\n",
-					i, ret);
-				close_ctree(info->chunk_root);
-				exit(1);
-			}
-		}
-
-		close_ctree(info->chunk_root);
-
-		/* fix metadata block to map correct chunk */
-		ret = restore_metadump(source, out, 0, num_threads, 1,
-				       target, 1);
-		if (ret) {
-			fprintf(stderr, "fix metadump failed (error=%d)\n",
-				ret);
-			exit(1);
-		}
-	}
-out:
-	if (out == stdout) {
-		fflush(out);
-	} else {
-		fclose(out);
-		if (ret && create) {
-			int unlink_ret;
-
-			unlink_ret = unlink(target);
-			if (unlink_ret)
-				fprintf(stderr,
-					"unlink output file failed : %s\n",
-					strerror(errno));
-		}
-	}
-
-	btrfs_close_all_devices();
-
-	return !!ret;
-}