btrfs-progs/kernel-shared/print-tree.c

/*
 * Copyright (C) 2007 Oracle.  All rights reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public
 * License v2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 021110-1307, USA.
 */

#include "kerncompat.h"
#include <stdio.h>
#include <ctype.h>
#include <errno.h>
#include <stdbool.h>
#include <stddef.h>
#include <string.h>
#include <time.h>
#include <uuid/uuid.h>
#include "kernel-shared/ctree.h"
#include "kernel-shared/disk-io.h"
#include "kernel-shared/print-tree.h"
#include "kernel-shared/volumes.h"
#include "kernel-shared/compression.h"
#include "kernel-shared/accessors.h"
#include "kernel-shared/file-item.h"
#include "kernel-shared/tree-checker.h"
#include "common/defs.h"
#include "common/internal.h"
#include "common/messages.h"
#include "common/string-utils.h"
#include "uapi/btrfs.h"

static void print_dir_item_type(struct extent_buffer *eb,
                                struct btrfs_dir_item *di)
{
	u8 type = btrfs_dir_ftype(eb, di);
	static const char* dir_item_str[] = {
		[BTRFS_FT_REG_FILE]	= "FILE",
		[BTRFS_FT_DIR] 		= "DIR",
		[BTRFS_FT_CHRDEV]	= "CHRDEV",
		[BTRFS_FT_BLKDEV]	= "BLKDEV",
		[BTRFS_FT_FIFO]		= "FIFO",
		[BTRFS_FT_SOCK]		= "SOCK",
		[BTRFS_FT_SYMLINK]	= "SYMLINK",
		[BTRFS_FT_XATTR]	= "XATTR"
	};

	if (type < ARRAY_SIZE(dir_item_str) && dir_item_str[type])
		printf("%s", dir_item_str[type]);
	else
		printf("DIR_ITEM.%u", type);
}

static void print_dir_item(struct extent_buffer *eb, u32 size,
			  struct btrfs_dir_item *di)
{
	u32 cur = 0;
	u32 len;
	u32 name_len;
	u32 data_len;
	char namebuf[BTRFS_NAME_LEN];
	struct btrfs_disk_key location;

	while (cur < size) {
		btrfs_dir_item_key(eb, di, &location);
		printf("\t\tlocation ");
		btrfs_print_key(&location);
		printf(" type ");
		print_dir_item_type(eb, di);
		printf("\n");
		name_len = btrfs_dir_name_len(eb, di);
		data_len = btrfs_dir_data_len(eb, di);
		if (data_len + name_len + cur > size) {
			error("invalid length, cur=%u name_len=%u data_len=%u size=%u",
			      cur, name_len, data_len, size);
			break;
		}
		len = (name_len <= sizeof(namebuf))? name_len: sizeof(namebuf);
		printf("\t\ttransid %llu data_len %u name_len %u\n",
				btrfs_dir_transid(eb, di),
				data_len, name_len);
		if (eb->fs_info && eb->fs_info->hide_names) {
			printf("\t\tname: HIDDEN\n");
		} else {
			read_extent_buffer(eb, namebuf,
					(unsigned long)(di + 1), len);
			printf("\t\tname: %.*s\n", len, namebuf);
		}

		if (data_len) {
			len = (data_len <= sizeof(namebuf)) ? data_len :
			      sizeof(namebuf);
			if (eb->fs_info && eb->fs_info->hide_names) {
				printf("\t\tdata HIDDEN\n");
			} else {
				read_extent_buffer(eb, namebuf,
					(unsigned long)(di + 1) + name_len, len);
				printf("\t\tdata %.*s\n", len, namebuf);
			}
		}
		len = sizeof(*di) + name_len + data_len;
		di = (struct btrfs_dir_item *)((char *)di + len);
		cur += len;
	}
}

static void print_inode_extref_item(struct extent_buffer *eb, u32 size,
		struct btrfs_inode_extref *extref)
{
	u32 cur = 0;
	u32 len;
	u32 name_len = 0;
	u64 index = 0;
	u64 parent_objid;
	char namebuf[BTRFS_NAME_LEN];

	while (cur < size) {
		index = btrfs_inode_extref_index(eb, extref);
		name_len = btrfs_inode_extref_name_len(eb, extref);
		parent_objid = btrfs_inode_extref_parent(eb, extref);

		len = (name_len <= sizeof(namebuf))? name_len: sizeof(namebuf);

		printf("\t\tindex %llu parent %llu namelen %u ",
				index, parent_objid, name_len);
		if (eb->fs_info && eb->fs_info->hide_names) {
			printf("name: HIDDEN\n");
		} else {
			read_extent_buffer(eb, namebuf,
					(unsigned long)extref->name, len);
			printf("name: %.*s\n", len, namebuf);
		}

		len = sizeof(*extref) + name_len;
		extref = (struct btrfs_inode_extref *)((char *)extref + len);
		cur += len;
	}
}

static void print_inode_ref_item(struct extent_buffer *eb, u32 size,
				struct btrfs_inode_ref *ref)
{
	u32 cur = 0;
	u32 len;
	u32 name_len;
	u64 index;
	char namebuf[BTRFS_NAME_LEN];

	while (cur < size) {
		name_len = btrfs_inode_ref_name_len(eb, ref);
		index = btrfs_inode_ref_index(eb, ref);
		len = (name_len <= sizeof(namebuf))? name_len: sizeof(namebuf);

		printf("\t\tindex %llu namelen %u ",
		       (unsigned long long)index, name_len);
		if (eb->fs_info && eb->fs_info->hide_names) {
			printf("name: HIDDEN\n");
		} else {
			read_extent_buffer(eb, namebuf,
					(unsigned long)(ref + 1), len);
			printf("name: %.*s\n", len, namebuf);
		}
		len = sizeof(*ref) + name_len;
		ref = (struct btrfs_inode_ref *)((char *)ref + len);
		cur += len;
	}
}

/* The minimal length for the string buffer of block group/chunk flags */
#define BG_FLAG_STRING_LEN	64

static void bg_flags_to_str(u64 flags, char *ret)
{
	int empty = 1;
	char profile[BG_FLAG_STRING_LEN] = {};
	const char *name;

	ret[0] = '\0';
	if (flags & BTRFS_BLOCK_GROUP_DATA) {
		empty = 0;
		strncpy_null(ret, "DATA", BG_FLAG_STRING_LEN);
	}
	if (flags & BTRFS_BLOCK_GROUP_METADATA) {
		if (!empty)
			strncat(ret, "|", BG_FLAG_STRING_LEN);
		strncat(ret, "METADATA", BG_FLAG_STRING_LEN);
	}
	if (flags & BTRFS_BLOCK_GROUP_SYSTEM) {
		if (!empty)
			strncat(ret, "|", BG_FLAG_STRING_LEN);
		strncat(ret, "SYSTEM", BG_FLAG_STRING_LEN);
	}
	name = btrfs_bg_type_to_raid_name(flags);
	if (!name) {
		snprintf(profile, BG_FLAG_STRING_LEN, "UNKNOWN.0x%llx",
			 flags & BTRFS_BLOCK_GROUP_PROFILE_MASK);
	} else {
		/*
		 * Special handing for SINGLE profile, we don't output "SINGLE"
		 * for SINGLE profile, since there is no such bit for it.
		 * Thus here we only fill @profile if it's not single.
		 */
		if (strncmp(name, "SINGLE", strlen("SINGLE")) != 0)
			strncpy_null(profile, name, BG_FLAG_STRING_LEN);
	}
	if (profile[0]) {
		strncat(ret, "|", BG_FLAG_STRING_LEN);
		strncat(ret, profile, BG_FLAG_STRING_LEN);
	}
}

/*
 * Caller should ensure sizeof(*ret) >= 64
 * "OFF|SCANNING|INCONSISTENT|UNKNOWN(0xffffffffffffffff)"
 */
static void qgroup_flags_to_str(u64 flags, char *ret)
{
	ret[0] = 0;

	if (flags & BTRFS_QGROUP_STATUS_FLAG_ON)
		strcpy(ret, "ON");
	else
		strcpy(ret, "OFF");

	if (flags & BTRFS_QGROUP_STATUS_FLAG_SIMPLE_MODE)
		strcat(ret, "|SIMPLE_MODE");
	if (flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN)
		strcat(ret, "|SCANNING");
	if (flags & BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT)
		strcat(ret, "|INCONSISTENT");
	if (flags & ~BTRFS_QGROUP_STATUS_FLAGS_MASK)
		sprintf(ret + strlen(ret), "|UNKNOWN(0x%llx)",
			flags & ~BTRFS_QGROUP_STATUS_FLAGS_MASK);
}

void print_chunk_item(struct extent_buffer *eb, struct btrfs_chunk *chunk)
{
	u16 num_stripes = btrfs_chunk_num_stripes(eb, chunk);
	int i;
	u32 chunk_item_size;
	char chunk_flags_str[BG_FLAG_STRING_LEN] = {};

	/* The chunk must contain at least one stripe */
	if (num_stripes < 1) {
		printf("invalid num_stripes: %u\n", num_stripes);
		return;
	}

	chunk_item_size = btrfs_chunk_item_size(num_stripes);

	if ((unsigned long)chunk + chunk_item_size > eb->len) {
		printf("\t\tchunk item invalid\n");
		return;
	}

	bg_flags_to_str(btrfs_chunk_type(eb, chunk), chunk_flags_str);
	printf("\t\tlength %llu owner %llu stripe_len %llu type %s\n",
	       (unsigned long long)btrfs_chunk_length(eb, chunk),
	       (unsigned long long)btrfs_chunk_owner(eb, chunk),
	       (unsigned long long)btrfs_chunk_stripe_len(eb, chunk),
		chunk_flags_str);
	printf("\t\tio_align %u io_width %u sector_size %u\n",
			btrfs_chunk_io_align(eb, chunk),
			btrfs_chunk_io_width(eb, chunk),
			btrfs_chunk_sector_size(eb, chunk));
	printf("\t\tnum_stripes %hu sub_stripes %hu\n", num_stripes,
			btrfs_chunk_sub_stripes(eb, chunk));
	for (i = 0 ; i < num_stripes ; i++) {
		unsigned char dev_uuid[BTRFS_UUID_SIZE];
		char str_dev_uuid[BTRFS_UUID_UNPARSED_SIZE];
		u64 uuid_offset;
		u64 stripe_offset;

		uuid_offset = (unsigned long)btrfs_stripe_dev_uuid_nr(chunk, i);
		stripe_offset = (unsigned long)btrfs_stripe_nr(chunk, i);

		if (uuid_offset < stripe_offset ||
			(uuid_offset + BTRFS_UUID_SIZE) >
				(stripe_offset + sizeof(struct btrfs_stripe))) {
			printf("\t\t\tstripe %d invalid\n", i);
			break;
		}

		read_extent_buffer(eb, dev_uuid,
			uuid_offset,
			BTRFS_UUID_SIZE);
		uuid_unparse(dev_uuid, str_dev_uuid);
		printf("\t\t\tstripe %d devid %llu offset %llu\n", i,
		      (unsigned long long)btrfs_stripe_devid_nr(eb, chunk, i),
		      (unsigned long long)btrfs_stripe_offset_nr(eb, chunk, i));
		printf("\t\t\tdev_uuid %s\n", str_dev_uuid);
	}
}

static void print_dev_item(struct extent_buffer *eb,
			   struct btrfs_dev_item *dev_item)
{
	char uuid_str[BTRFS_UUID_UNPARSED_SIZE];
	char fsid_str[BTRFS_UUID_UNPARSED_SIZE];
	u8 uuid[BTRFS_UUID_SIZE];
	u8 fsid[BTRFS_UUID_SIZE];

	read_extent_buffer(eb, uuid,
			   (unsigned long)btrfs_device_uuid(dev_item),
			   BTRFS_UUID_SIZE);
	uuid_unparse(uuid, uuid_str);
	read_extent_buffer(eb, fsid,
			   (unsigned long)btrfs_device_fsid(dev_item),
			   BTRFS_UUID_SIZE);
	uuid_unparse(fsid, fsid_str);
	printf("\t\tdevid %llu total_bytes %llu bytes_used %llu\n"
	       "\t\tio_align %u io_width %u sector_size %u type %llu\n"
	       "\t\tgeneration %llu start_offset %llu dev_group %u\n"
	       "\t\tseek_speed %hhu bandwidth %hhu\n"
	       "\t\tuuid %s\n"
	       "\t\tfsid %s\n",
	       (unsigned long long)btrfs_device_id(eb, dev_item),
	       (unsigned long long)btrfs_device_total_bytes(eb, dev_item),
	       (unsigned long long)btrfs_device_bytes_used(eb, dev_item),
	       btrfs_device_io_align(eb, dev_item),
	       btrfs_device_io_width(eb, dev_item),
	       btrfs_device_sector_size(eb, dev_item),
	       (unsigned long long)btrfs_device_type(eb, dev_item),
	       (unsigned long long)btrfs_device_generation(eb, dev_item),
	       (unsigned long long)btrfs_device_start_offset(eb, dev_item),
	       btrfs_device_group(eb, dev_item),
	       btrfs_device_seek_speed(eb, dev_item),
	       btrfs_device_bandwidth(eb, dev_item),
	       uuid_str, fsid_str);
}

static void print_uuids(struct extent_buffer *eb)
{
	char fs_uuid[BTRFS_UUID_UNPARSED_SIZE];
	char chunk_uuid[BTRFS_UUID_UNPARSED_SIZE];
	u8 disk_uuid[BTRFS_UUID_SIZE];

	read_extent_buffer(eb, disk_uuid, btrfs_header_fsid(),
			   BTRFS_FSID_SIZE);

	fs_uuid[BTRFS_UUID_UNPARSED_SIZE - 1] = '\0';
	uuid_unparse(disk_uuid, fs_uuid);

	read_extent_buffer(eb, disk_uuid,
			   btrfs_header_chunk_tree_uuid(eb),
			   BTRFS_UUID_SIZE);

	chunk_uuid[BTRFS_UUID_UNPARSED_SIZE - 1] = '\0';
	uuid_unparse(disk_uuid, chunk_uuid);
	printf("fs uuid %s\nchunk uuid %s\n", fs_uuid, chunk_uuid);
}

static void compress_type_to_str(u8 compress_type, char *ret)
{
	switch (compress_type) {
	case BTRFS_COMPRESS_NONE:
		strcpy(ret, "none");
		break;
	case BTRFS_COMPRESS_ZLIB:
		strcpy(ret, "zlib");
		break;
	case BTRFS_COMPRESS_LZO:
		strcpy(ret, "lzo");
		break;
	case BTRFS_COMPRESS_ZSTD:
		strcpy(ret, "zstd");
		break;
	default:
		sprintf(ret, "UNKNOWN.%d", compress_type);
	}
}

static const char* file_extent_type_to_str(u8 type)
{
	switch (type) {
	case BTRFS_FILE_EXTENT_INLINE: return "inline";
	case BTRFS_FILE_EXTENT_PREALLOC: return "prealloc";
	case BTRFS_FILE_EXTENT_REG: return "regular";
	default: return "unknown";
	}
}

static void print_file_extent_item(struct extent_buffer *eb,
				   int slot,
				   struct btrfs_file_extent_item *fi)
{
	unsigned char extent_type = btrfs_file_extent_type(eb, fi);
	char compress_str[16];

	compress_type_to_str(btrfs_file_extent_compression(eb, fi),
			     compress_str);

	printf("\t\tgeneration %llu type %hhu (%s)\n",
			btrfs_file_extent_generation(eb, fi),
			extent_type, file_extent_type_to_str(extent_type));

	if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
		printf("\t\tinline extent data size %u ram_bytes %llu compression %hhu (%s)\n",
				btrfs_file_extent_inline_item_len(eb, slot),
				btrfs_file_extent_ram_bytes(eb, fi),
				btrfs_file_extent_compression(eb, fi),
				compress_str);
		return;
	}
	if (extent_type == BTRFS_FILE_EXTENT_PREALLOC) {
		printf("\t\tprealloc data disk byte %llu nr %llu\n",
		  (unsigned long long)btrfs_file_extent_disk_bytenr(eb, fi),
		  (unsigned long long)btrfs_file_extent_disk_num_bytes(eb, fi));
		printf("\t\tprealloc data offset %llu nr %llu\n",
		  (unsigned long long)btrfs_file_extent_offset(eb, fi),
		  (unsigned long long)btrfs_file_extent_num_bytes(eb, fi));
		return;
	}
	printf("\t\textent data disk byte %llu nr %llu\n",
		(unsigned long long)btrfs_file_extent_disk_bytenr(eb, fi),
		(unsigned long long)btrfs_file_extent_disk_num_bytes(eb, fi));
	printf("\t\textent data offset %llu nr %llu ram %llu\n",
		(unsigned long long)btrfs_file_extent_offset(eb, fi),
		(unsigned long long)btrfs_file_extent_num_bytes(eb, fi),
		(unsigned long long)btrfs_file_extent_ram_bytes(eb, fi));
	printf("\t\textent compression %hhu (%s)\n",
			btrfs_file_extent_compression(eb, fi),
			compress_str);
}

/* Caller should ensure sizeof(*ret) >= 16("DATA|TREE_BLOCK") */
static void extent_flags_to_str(u64 flags, char *ret)
{
	int empty = 1;

	ret[0] = 0;
	if (flags & BTRFS_EXTENT_FLAG_DATA) {
		empty = 0;
		strcpy(ret, "DATA");
	}
	if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) {
		if (!empty) {
			empty = 0;
			strcat(ret, "|");
		}
		strcat(ret, "TREE_BLOCK");
	}
	if (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF) {
		strcat(ret, "|");
		strcat(ret, "FULL_BACKREF");
	}
}

void print_extent_item(struct extent_buffer *eb, int slot, int metadata)
{
	struct btrfs_extent_item *ei;
	struct btrfs_extent_inline_ref *iref;
	struct btrfs_extent_data_ref *dref;
	struct btrfs_shared_data_ref *sref;
	struct btrfs_disk_key key;
	unsigned long end;
	unsigned long ptr;
	int type;
	u32 item_size = btrfs_item_size(eb, slot);
	u64 flags;
	u64 offset;
	char flags_str[32] = {0};

	if (item_size < sizeof(*ei))
		return;

	ei = btrfs_item_ptr(eb, slot, struct btrfs_extent_item);
	flags = btrfs_extent_flags(eb, ei);
	extent_flags_to_str(flags, flags_str);

	printf("\t\trefs %llu gen %llu flags %s\n",
	       (unsigned long long)btrfs_extent_refs(eb, ei),
	       (unsigned long long)btrfs_extent_generation(eb, ei),
	       flags_str);

	if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK && !metadata) {
		struct btrfs_tree_block_info *info;
		info = (struct btrfs_tree_block_info *)(ei + 1);
		btrfs_tree_block_key(eb, info, &key);
		printf("\t\ttree block ");
		btrfs_print_key(&key);
		printf(" level %d\n", btrfs_tree_block_level(eb, info));
		iref = (struct btrfs_extent_inline_ref *)(info + 1);
	} else if (metadata) {
		struct btrfs_key tmp;

		btrfs_item_key_to_cpu(eb, &tmp, slot);
		printf("\t\ttree block skinny level %d\n", (int)tmp.offset);
		iref = (struct btrfs_extent_inline_ref *)(ei + 1);
	} else{
		iref = (struct btrfs_extent_inline_ref *)(ei + 1);
	}

	ptr = (unsigned long)iref;
	end = (unsigned long)ei + item_size;
	while (ptr < end) {
		u64 seq;

		iref = (struct btrfs_extent_inline_ref *)ptr;
		type = btrfs_extent_inline_ref_type(eb, iref);
		offset = btrfs_extent_inline_ref_offset(eb, iref);
		seq = offset;
		switch (type) {
		case BTRFS_TREE_BLOCK_REF_KEY:
			printf("\t\t(%u 0x%llx) tree block backref root ", type, seq);
			print_objectid(stdout, offset, 0);
			printf("\n");
			break;
		case BTRFS_SHARED_BLOCK_REF_KEY:
			printf("\t\t(%u 0x%llx) shared block backref parent %llu\n",
			       type, seq, offset);
			break;
		case BTRFS_EXTENT_DATA_REF_KEY:
			dref = (struct btrfs_extent_data_ref *)(&iref->offset);
			seq = hash_extent_data_ref(
					btrfs_extent_data_ref_root(eb, dref),
					btrfs_extent_data_ref_objectid(eb, dref),
					btrfs_extent_data_ref_offset(eb, dref));
			printf("\t\t(%u 0x%llx) extent data backref root ", type, seq);
			print_objectid(stdout, btrfs_extent_data_ref_root(eb, dref), 0);
			printf(" objectid %llu offset %llu count %u\n",
			       btrfs_extent_data_ref_objectid(eb, dref),
			       btrfs_extent_data_ref_offset(eb, dref),
			       btrfs_extent_data_ref_count(eb, dref));
			break;
		case BTRFS_SHARED_DATA_REF_KEY:
			sref = (struct btrfs_shared_data_ref *)(iref + 1);
			printf("\t\t(%u 0x%llx) shared data backref parent %llu count %u\n",
			       type, seq, offset, btrfs_shared_data_ref_count(eb, sref));
			break;
		case BTRFS_EXTENT_OWNER_REF_KEY:
			printf("\t\(%u 0x%llx) textent owner root %llu\n",
			       type, seq, offset);
			break;
		default:
			return;
		}
		ptr += btrfs_extent_inline_ref_size(type);
	}
	WARN_ON(ptr > end);
}

static void print_root_ref(struct extent_buffer *leaf, int slot, const char *tag)
{
	struct btrfs_root_ref *ref;
	char namebuf[BTRFS_NAME_LEN];
	int namelen;

	ref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref);
	namelen = btrfs_root_ref_name_len(leaf, ref);
	read_extent_buffer(leaf, namebuf, (unsigned long)(ref + 1), namelen);
	printf("\t\troot %s key dirid %llu sequence %llu name %.*s\n", tag,
	       (unsigned long long)btrfs_root_ref_dirid(leaf, ref),
	       (unsigned long long)btrfs_root_ref_sequence(leaf, ref),
	       namelen, namebuf);
}

/*
 * Caller must ensure sizeof(*ret) >= 7 "RDONLY"
 */
static void root_flags_to_str(u64 flags, char *ret)
{
	if (flags & BTRFS_ROOT_SUBVOL_RDONLY)
		strcat(ret, "RDONLY");
	else
		strcat(ret, "none");
}

static void print_timespec(struct extent_buffer *eb,
		struct btrfs_timespec *timespec, const char *prefix,
		const char *suffix)
{
	struct tm tm;
	u64 tmp_u64;
	u32 tmp_u32;
	time_t tmp_time;
	char timestamp[256];

	tmp_u64 = btrfs_timespec_sec(eb, timespec);
	tmp_u32 = btrfs_timespec_nsec(eb, timespec);
	tmp_time = tmp_u64;
	localtime_r(&tmp_time, &tm);
	strftime(timestamp, sizeof(timestamp),
			"%Y-%m-%d %H:%M:%S", &tm);
	printf("%s%llu.%u (%s)%s", prefix, (unsigned long long)tmp_u64, tmp_u32,
			timestamp, suffix);
}

static void print_root_item(struct extent_buffer *leaf, int slot)
{
	struct btrfs_root_item *ri;
	struct btrfs_root_item root_item;
	int len;
	char uuid_str[BTRFS_UUID_UNPARSED_SIZE];
	char flags_str[32] = {0};
	struct btrfs_key drop_key;

	ri = btrfs_item_ptr(leaf, slot, struct btrfs_root_item);
	len = btrfs_item_size(leaf, slot);

	memset(&root_item, 0, sizeof(root_item));
	read_extent_buffer(leaf, &root_item, (unsigned long)ri, len);
	root_flags_to_str(btrfs_root_flags(&root_item), flags_str);

	printf("\t\tgeneration %llu root_dirid %llu bytenr %llu byte_limit %llu bytes_used %llu\n",
		(unsigned long long)btrfs_root_generation(&root_item),
		(unsigned long long)btrfs_root_dirid(&root_item),
		(unsigned long long)btrfs_root_bytenr(&root_item),
		(unsigned long long)btrfs_root_limit(&root_item),
		(unsigned long long)btrfs_root_used(&root_item));
	printf("\t\tlast_snapshot %llu flags 0x%llx(%s) refs %u\n",
		(unsigned long long)btrfs_root_last_snapshot(&root_item),
		(unsigned long long)btrfs_root_flags(&root_item),
		flags_str,
		btrfs_root_refs(&root_item));
	btrfs_disk_key_to_cpu(&drop_key, &root_item.drop_progress);
	printf("\t\tdrop_progress ");
	btrfs_print_key(&root_item.drop_progress);
	printf(" drop_level %hhu\n", root_item.drop_level);

	printf("\t\tlevel %hhu generation_v2 %llu\n",
		btrfs_root_level(&root_item), root_item.generation_v2);

	if (root_item.generation == root_item.generation_v2) {
		uuid_unparse(root_item.uuid, uuid_str);
		printf("\t\tuuid %s\n", uuid_str);
		uuid_unparse(root_item.parent_uuid, uuid_str);
		printf("\t\tparent_uuid %s\n", uuid_str);
		uuid_unparse(root_item.received_uuid, uuid_str);
		printf("\t\treceived_uuid %s\n", uuid_str);
		printf("\t\tctransid %llu otransid %llu stransid %llu rtransid %llu\n",
				btrfs_root_ctransid(&root_item),
				btrfs_root_otransid(&root_item),
				btrfs_root_stransid(&root_item),
				btrfs_root_rtransid(&root_item));
		print_timespec(leaf, btrfs_root_ctime(ri),
					"\t\tctime ", "\n");
		print_timespec(leaf, btrfs_root_otime(ri),
					"\t\totime ", "\n");
		print_timespec(leaf, btrfs_root_stime(ri),
					"\t\tstime ", "\n");
		print_timespec(leaf, btrfs_root_rtime(ri),
					"\t\trtime ", "\n");
	}
}

static void print_free_space_header(struct extent_buffer *leaf, int slot)
{
	struct btrfs_free_space_header *header;
	struct btrfs_disk_key location;

	header = btrfs_item_ptr(leaf, slot, struct btrfs_free_space_header);
	btrfs_free_space_key(leaf, header, &location);
	printf("\t\tlocation ");
	btrfs_print_key(&location);
	printf("\n");
	printf("\t\tcache generation %llu entries %llu bitmaps %llu\n",
	       (unsigned long long)btrfs_free_space_generation(leaf, header),
	       (unsigned long long)btrfs_free_space_entries(leaf, header),
	       (unsigned long long)btrfs_free_space_bitmaps(leaf, header));
}

struct raid_encoding_map {
	u8 encoding;
	char name[16];
};

static const struct raid_encoding_map raid_map[] = {
	{ BTRFS_STRIPE_DUP,	"DUP" },
	{ BTRFS_STRIPE_RAID0,	"RAID0" },
	{ BTRFS_STRIPE_RAID1,	"RAID1" },
	{ BTRFS_STRIPE_RAID1C3,	"RAID1C3" },
	{ BTRFS_STRIPE_RAID1C4, "RAID1C4" },
	{ BTRFS_STRIPE_RAID5,	"RAID5" },
	{ BTRFS_STRIPE_RAID6,	"RAID6" },
	{ BTRFS_STRIPE_RAID10,	"RAID10" }
};

static const char *stripe_encoding_name(u8 encoding)
{
	for (int i = 0; i < ARRAY_SIZE(raid_map); i++) {
		if (raid_map[i].encoding == encoding)
			return raid_map[i].name;
	}

	return "UNKNOWN";
}

static void print_raid_stripe_key(struct extent_buffer *eb,
				  u32 item_size, struct btrfs_stripe_extent *stripe)
{
	int num_stripes;
	u8 encoding = btrfs_stripe_extent_encoding(eb, stripe);

	num_stripes = (item_size - offsetof(struct btrfs_stripe_extent, strides)) /
		      sizeof(struct btrfs_raid_stride);

	printf("\t\t\tencoding: %s\n", stripe_encoding_name(encoding));
	for (int i = 0; i < num_stripes; i++)
		printf("\t\t\tstripe %d devid %llu physical %llu\n", i,
		       (unsigned long long)btrfs_raid_stride_devid_nr(eb, stripe, i),
		       (unsigned long long)btrfs_raid_stride_offset_nr(eb, stripe, i));
}

void print_key_type(FILE *stream, u64 objectid, u8 type)
{
	static const char* key_to_str[256] = {
		[BTRFS_INODE_ITEM_KEY]		= "INODE_ITEM",
		[BTRFS_INODE_REF_KEY]		= "INODE_REF",
		[BTRFS_INODE_EXTREF_KEY]	= "INODE_EXTREF",
		[BTRFS_DIR_ITEM_KEY]		= "DIR_ITEM",
		[BTRFS_DIR_INDEX_KEY]		= "DIR_INDEX",
		[BTRFS_DIR_LOG_ITEM_KEY]	= "DIR_LOG_ITEM",
		[BTRFS_DIR_LOG_INDEX_KEY]	= "DIR_LOG_INDEX",
		[BTRFS_XATTR_ITEM_KEY]		= "XATTR_ITEM",
		[BTRFS_VERITY_DESC_ITEM_KEY]	= "VERITY_DESC_ITEM",
		[BTRFS_VERITY_MERKLE_ITEM_KEY]	= "VERITY_MERKLE_ITEM",
		[BTRFS_ORPHAN_ITEM_KEY]		= "ORPHAN_ITEM",
		[BTRFS_ROOT_ITEM_KEY]		= "ROOT_ITEM",
		[BTRFS_ROOT_REF_KEY]		= "ROOT_REF",
		[BTRFS_ROOT_BACKREF_KEY]	= "ROOT_BACKREF",
		[BTRFS_EXTENT_ITEM_KEY]		= "EXTENT_ITEM",
		[BTRFS_METADATA_ITEM_KEY]	= "METADATA_ITEM",
		[BTRFS_TREE_BLOCK_REF_KEY]	= "TREE_BLOCK_REF",
		[BTRFS_SHARED_BLOCK_REF_KEY]	= "SHARED_BLOCK_REF",
		[BTRFS_EXTENT_DATA_REF_KEY]	= "EXTENT_DATA_REF",
		[BTRFS_SHARED_DATA_REF_KEY]	= "SHARED_DATA_REF",
		[BTRFS_EXTENT_REF_V0_KEY]	= "EXTENT_REF_V0",
		[BTRFS_EXTENT_OWNER_REF_KEY]	= "EXTENT_OWNER_REF",
		[BTRFS_CSUM_ITEM_KEY]		= "CSUM_ITEM",
		[BTRFS_EXTENT_CSUM_KEY]		= "EXTENT_CSUM",
		[BTRFS_EXTENT_DATA_KEY]		= "EXTENT_DATA",
		[BTRFS_BLOCK_GROUP_ITEM_KEY]	= "BLOCK_GROUP_ITEM",
		[BTRFS_FREE_SPACE_INFO_KEY]	= "FREE_SPACE_INFO",
		[BTRFS_FREE_SPACE_EXTENT_KEY]	= "FREE_SPACE_EXTENT",
		[BTRFS_FREE_SPACE_BITMAP_KEY]	= "FREE_SPACE_BITMAP",
		[BTRFS_CHUNK_ITEM_KEY]		= "CHUNK_ITEM",
		[BTRFS_DEV_ITEM_KEY]		= "DEV_ITEM",
		[BTRFS_DEV_EXTENT_KEY]		= "DEV_EXTENT",
		[BTRFS_TEMPORARY_ITEM_KEY]	= "TEMPORARY_ITEM",
		[BTRFS_DEV_REPLACE_KEY]		= "DEV_REPLACE",
		[BTRFS_STRING_ITEM_KEY]		= "STRING_ITEM",
		[BTRFS_QGROUP_STATUS_KEY]	= "QGROUP_STATUS",
		[BTRFS_QGROUP_RELATION_KEY]	= "QGROUP_RELATION",
		[BTRFS_QGROUP_INFO_KEY]		= "QGROUP_INFO",
		[BTRFS_QGROUP_LIMIT_KEY]	= "QGROUP_LIMIT",
		[BTRFS_PERSISTENT_ITEM_KEY]	= "PERSISTENT_ITEM",
		[BTRFS_UUID_KEY_SUBVOL]		= "UUID_KEY_SUBVOL",
		[BTRFS_UUID_KEY_RECEIVED_SUBVOL] = "UUID_KEY_RECEIVED_SUBVOL",
		[BTRFS_RAID_STRIPE_KEY]		= "RAID_STRIPE",
	};

	if (type == 0 && objectid == BTRFS_FREE_SPACE_OBJECTID) {
		fprintf(stream, "UNTYPED");
		return;
	}


	if (key_to_str[type])
		fputs(key_to_str[type], stream);
	else
		fprintf(stream, "UNKNOWN.%d", type);
}

void print_objectid(FILE *stream, u64 objectid, u8 type)
{
	switch (type) {
	case BTRFS_PERSISTENT_ITEM_KEY:
		if (objectid == BTRFS_DEV_STATS_OBJECTID)
			fprintf(stream, "DEV_STATS");
		else
			fprintf(stream, "%llu", (unsigned long long)objectid);
		return;
	case BTRFS_DEV_EXTENT_KEY:
		/* device id */
		fprintf(stream, "%llu", (unsigned long long)objectid);
		return;
	case BTRFS_QGROUP_RELATION_KEY:
		fprintf(stream, "%u/%llu", btrfs_qgroup_level(objectid),
		       btrfs_qgroup_subvolid(objectid));
		return;
	case BTRFS_UUID_KEY_SUBVOL:
	case BTRFS_UUID_KEY_RECEIVED_SUBVOL:
		fprintf(stream, "0x%016llx", (unsigned long long)objectid);
		return;
	}

	switch (objectid) {
	case BTRFS_ROOT_TREE_OBJECTID:
		/*
		 * BTRFS_ROOT_TREE_OBJECTID and BTRFS_DEV_ITEMS_OBJECTID are
		 * defined with the same value 1, we need to distinguish them
		 * by the type.
		 */
		if (type == BTRFS_DEV_ITEM_KEY)
			fprintf(stream, "DEV_ITEMS");
		else
			fprintf(stream, "ROOT_TREE");
		break;
	case BTRFS_EXTENT_TREE_OBJECTID:
		fprintf(stream, "EXTENT_TREE");
		break;
	case BTRFS_CHUNK_TREE_OBJECTID:
		fprintf(stream, "CHUNK_TREE");
		break;
	case BTRFS_DEV_TREE_OBJECTID:
		fprintf(stream, "DEV_TREE");
		break;
	case BTRFS_FS_TREE_OBJECTID:
		fprintf(stream, "FS_TREE");
		break;
	case BTRFS_ROOT_TREE_DIR_OBJECTID:
		fprintf(stream, "ROOT_TREE_DIR");
		break;
	case BTRFS_CSUM_TREE_OBJECTID:
		fprintf(stream, "CSUM_TREE");
		break;
	case BTRFS_BALANCE_OBJECTID:
		fprintf(stream, "BALANCE");
		break;
	case BTRFS_ORPHAN_OBJECTID:
		fprintf(stream, "ORPHAN");
		break;
	case BTRFS_TREE_LOG_OBJECTID:
		fprintf(stream, "TREE_LOG");
		break;
	case BTRFS_TREE_LOG_FIXUP_OBJECTID:
		fprintf(stream, "LOG_FIXUP");
		break;
	case BTRFS_TREE_RELOC_OBJECTID:
		fprintf(stream, "TREE_RELOC");
		break;
	case BTRFS_DATA_RELOC_TREE_OBJECTID:
		fprintf(stream, "DATA_RELOC_TREE");
		break;
	case BTRFS_EXTENT_CSUM_OBJECTID:
		fprintf(stream, "EXTENT_CSUM");
		break;
	case BTRFS_FREE_SPACE_OBJECTID:
		fprintf(stream, "FREE_SPACE");
		break;
	case BTRFS_FREE_INO_OBJECTID:
		fprintf(stream, "FREE_INO");
		break;
	case BTRFS_QUOTA_TREE_OBJECTID:
		fprintf(stream, "QUOTA_TREE");
		break;
	case BTRFS_UUID_TREE_OBJECTID:
		fprintf(stream, "UUID_TREE");
		break;
	case BTRFS_FREE_SPACE_TREE_OBJECTID:
		fprintf(stream, "FREE_SPACE_TREE");
		break;
	case BTRFS_MULTIPLE_OBJECTIDS:
		fprintf(stream, "MULTIPLE");
		break;
	case BTRFS_BLOCK_GROUP_TREE_OBJECTID:
		fprintf(stream, "BLOCK_GROUP_TREE");
		break;
	case BTRFS_CSUM_CHANGE_OBJECTID:
		fprintf(stream, "CSUM_CHANGE");
		break;
	case  BTRFS_RAID_STRIPE_TREE_OBJECTID:
		fprintf(stream, "RAID_STRIPE_TREE");
		break;
	case (u64)-1:
		fprintf(stream, "-1");
		break;
	case BTRFS_FIRST_CHUNK_TREE_OBJECTID:
		if (type == BTRFS_CHUNK_ITEM_KEY) {
			fprintf(stream, "FIRST_CHUNK_TREE");
			break;
		}
		fallthrough;
	default:
		fprintf(stream, "%llu", (unsigned long long)objectid);
	}
}

void btrfs_print_key(struct btrfs_disk_key *disk_key)
{
	u64 objectid = btrfs_disk_key_objectid(disk_key);
	u8 type = btrfs_disk_key_type(disk_key);
	u64 offset = btrfs_disk_key_offset(disk_key);

	printf("key (");
	print_objectid(stdout, objectid, type);
	printf(" ");
	print_key_type(stdout, objectid, type);
	switch (type) {
	case BTRFS_QGROUP_RELATION_KEY:
	case BTRFS_QGROUP_INFO_KEY:
	case BTRFS_QGROUP_LIMIT_KEY:
		printf(" %u/%llu)", btrfs_qgroup_level(offset),
		       btrfs_qgroup_subvolid(offset));
		break;
	case BTRFS_UUID_KEY_SUBVOL:
	case BTRFS_UUID_KEY_RECEIVED_SUBVOL:
		printf(" 0x%016llx)", (unsigned long long)offset);
		break;

	/*
	 * Key offsets of ROOT_ITEM point to tree root, print them in human
	 * readable format.  Especially useful for trees like data/tree reloc
	 * tree, whose tree id can be negative.
	 */
	case BTRFS_ROOT_ITEM_KEY:
		printf(" ");
		/*
		 * Normally offset of ROOT_ITEM should present the generation
		 * of creation time of the root.
		 * However if this is reloc tree, offset is the subvolume
		 * id of its source. Here we do extra check on this.
		 */
		if (objectid == BTRFS_TREE_RELOC_OBJECTID)
			print_objectid(stdout, offset, type);
		else
			printf("%llu", offset);
		printf(")");
		break;
	default:
		if (offset == (u64)-1)
			printf(" -1)");
		else
			printf(" %llu)", (unsigned long long)offset);
		break;
	}
}

static void print_uuid_item(struct extent_buffer *l, unsigned long offset,
			    u32 item_size)
{
	if (item_size & (sizeof(u64) - 1)) {
		printf("btrfs: uuid item with illegal size %lu!\n",
		       (unsigned long)item_size);
		return;
	}
	while (item_size) {
		__le64 subvol_id;

		read_extent_buffer(l, &subvol_id, offset, sizeof(u64));
		printf("\t\tsubvol_id %llu\n",
			(unsigned long long)le64_to_cpu(subvol_id));
		item_size -= sizeof(u64);
		offset += sizeof(u64);
	}
}

/* Btrfs inode flag stringification helper */
#define STRCAT_ONE_INODE_FLAG(flags, name, empty, dst) ({			\
	if (flags & BTRFS_INODE_##name) {				\
		if (!empty)						\
			strcat(dst, "|");				\
		strcat(dst, #name);					\
		empty = 0;						\
	}								\
})

/*
 * Caller should ensure sizeof(*ret) >= 102: all characters plus '|' of
 * BTRFS_INODE_* flags
 */
static void inode_flags_to_str(u64 flags, char *ret)
{
	int empty = 1;

	STRCAT_ONE_INODE_FLAG(flags, NODATASUM, empty, ret);
	STRCAT_ONE_INODE_FLAG(flags, NODATACOW, empty, ret);
	STRCAT_ONE_INODE_FLAG(flags, READONLY, empty, ret);
	STRCAT_ONE_INODE_FLAG(flags, NOCOMPRESS, empty, ret);
	STRCAT_ONE_INODE_FLAG(flags, PREALLOC, empty, ret);
	STRCAT_ONE_INODE_FLAG(flags, SYNC, empty, ret);
	STRCAT_ONE_INODE_FLAG(flags, IMMUTABLE, empty, ret);
	STRCAT_ONE_INODE_FLAG(flags, APPEND, empty, ret);
	STRCAT_ONE_INODE_FLAG(flags, NODUMP, empty, ret);
	STRCAT_ONE_INODE_FLAG(flags, NOATIME, empty, ret);
	STRCAT_ONE_INODE_FLAG(flags, DIRSYNC, empty, ret);
	STRCAT_ONE_INODE_FLAG(flags, COMPRESS, empty, ret);
	if (empty)
		strcat(ret, "none");
}

static void print_inode_item(struct extent_buffer *eb,
		struct btrfs_inode_item *ii)
{
	char flags_str[256];

	memset(flags_str, 0, sizeof(flags_str));
	inode_flags_to_str(btrfs_inode_flags(eb, ii), flags_str);
	printf("\t\tgeneration %llu transid %llu size %llu nbytes %llu\n"
	       "\t\tblock group %llu mode %o links %u uid %u gid %u rdev %llu\n"
	       "\t\tsequence %llu flags 0x%llx(%s)\n",
	       (unsigned long long)btrfs_inode_generation(eb, ii),
	       (unsigned long long)btrfs_inode_transid(eb, ii),
	       (unsigned long long)btrfs_inode_size(eb, ii),
	       (unsigned long long)btrfs_inode_nbytes(eb, ii),
	       (unsigned long long)btrfs_inode_block_group(eb,ii),
	       btrfs_inode_mode(eb, ii),
	       btrfs_inode_nlink(eb, ii),
	       btrfs_inode_uid(eb, ii),
	       btrfs_inode_gid(eb, ii),
	       (unsigned long long)btrfs_inode_rdev(eb,ii),
	       (unsigned long long)btrfs_inode_sequence(eb, ii),
	       (unsigned long long)btrfs_inode_flags(eb,ii),
	       flags_str);
	print_timespec(eb, btrfs_inode_atime(ii), "\t\tatime ", "\n");
	print_timespec(eb, btrfs_inode_ctime(ii), "\t\tctime ", "\n");
	print_timespec(eb, btrfs_inode_mtime(ii), "\t\tmtime ", "\n");
	print_timespec(eb, btrfs_inode_otime(ii), "\t\totime ", "\n");
}

static void print_disk_balance_args(struct btrfs_disk_balance_args *ba)
{
	printf("\t\tprofiles %llu devid %llu target %llu flags %llu\n",
			(unsigned long long)le64_to_cpu(ba->profiles),
			(unsigned long long)le64_to_cpu(ba->devid),
			(unsigned long long)le64_to_cpu(ba->target),
			(unsigned long long)le64_to_cpu(ba->flags));
	printf("\t\tusage_min %u usage_max %u pstart %llu pend %llu\n",
			le32_to_cpu(ba->usage_min),
			le32_to_cpu(ba->usage_max),
			(unsigned long long)le64_to_cpu(ba->pstart),
			(unsigned long long)le64_to_cpu(ba->pend));
	printf("\t\tvstart %llu vend %llu limit_min %u limit_max %u\n",
			(unsigned long long)le64_to_cpu(ba->vstart),
			(unsigned long long)le64_to_cpu(ba->vend),
			le32_to_cpu(ba->limit_min),
			le32_to_cpu(ba->limit_max));
	printf("\t\tstripes_min %u stripes_max %u\n",
			le32_to_cpu(ba->stripes_min),
			le32_to_cpu(ba->stripes_max));
}

static void print_balance_item(struct extent_buffer *eb,
		struct btrfs_balance_item *bi)
{
	struct btrfs_disk_balance_args ba;

	printf("\t\tbalance status flags %llu\n",
			btrfs_balance_flags(eb, bi));

	printf("\t\tDATA\n");
	btrfs_balance_data(eb, bi, &ba);
	print_disk_balance_args(&ba);
	printf("\t\tMETADATA\n");
	btrfs_balance_meta(eb, bi, &ba);
	print_disk_balance_args(&ba);
	printf("\t\tSYSTEM\n");
	btrfs_balance_sys(eb, bi, &ba);
	print_disk_balance_args(&ba);
}

static void print_dev_stats(struct extent_buffer *eb,
		struct btrfs_dev_stats_item *stats, u32 size)
{
	u32 known = BTRFS_DEV_STAT_VALUES_MAX * sizeof(__le64);
	int i;

	printf("\t\tdevice stats\n");
	printf("\t\twrite_errs %llu read_errs %llu flush_errs %llu corruption_errs %llu generation %llu\n",
	      btrfs_dev_stats_value(eb, stats, BTRFS_DEV_STAT_WRITE_ERRS),
	      btrfs_dev_stats_value(eb, stats, BTRFS_DEV_STAT_READ_ERRS),
	      btrfs_dev_stats_value(eb, stats, BTRFS_DEV_STAT_FLUSH_ERRS),
	      btrfs_dev_stats_value(eb, stats, BTRFS_DEV_STAT_CORRUPTION_ERRS),
	      btrfs_dev_stats_value(eb, stats, BTRFS_DEV_STAT_GENERATION_ERRS));

	if (known < size) {
		printf("\t\tunknown stats item bytes %u", size - known);
		for (i = BTRFS_DEV_STAT_VALUES_MAX; i * sizeof(__le64) < size; i++) {
			printf("\t\tunknown item %d offset %zu value %llu\n",
				i, i * sizeof(__le64),
				btrfs_dev_stats_value(eb, stats, i));
		}
	}
}

static void print_block_group_item(struct extent_buffer *eb,
		struct btrfs_block_group_item *bgi)
{
	struct btrfs_block_group_item bg_item;
	char flags_str[BG_FLAG_STRING_LEN] = {};

	read_extent_buffer(eb, &bg_item, (unsigned long)bgi, sizeof(bg_item));
	memset(flags_str, 0, sizeof(flags_str));
	bg_flags_to_str(btrfs_stack_block_group_flags(&bg_item), flags_str);
	printf("\t\tblock group used %llu chunk_objectid %llu flags %s\n",
		btrfs_stack_block_group_used(&bg_item),
		btrfs_stack_block_group_chunk_objectid(&bg_item),
		flags_str);
}

static void print_extent_data_ref(struct extent_buffer *eb, int slot)
{
	struct btrfs_extent_data_ref *dref;

	dref = btrfs_item_ptr(eb, slot, struct btrfs_extent_data_ref);
	printf("\t\textent data backref root ");
	print_objectid(stdout,
		(unsigned long long)btrfs_extent_data_ref_root(eb, dref), 0);
	printf(" objectid %llu offset %llu count %u\n",
		(unsigned long long)btrfs_extent_data_ref_objectid(eb, dref),
		(unsigned long long)btrfs_extent_data_ref_offset(eb, dref),
		btrfs_extent_data_ref_count(eb, dref));
}

static void print_shared_data_ref(struct extent_buffer *eb, int slot)
{
	struct btrfs_shared_data_ref *sref;

	sref = btrfs_item_ptr(eb, slot, struct btrfs_shared_data_ref);
	printf("\t\tshared data backref count %u\n",
		btrfs_shared_data_ref_count(eb, sref));
}

static void print_extent_owner_ref(struct extent_buffer *eb, int slot)
{
	struct btrfs_extent_owner_ref *oref;
	u64 root_id;

	oref = btrfs_item_ptr(eb, slot, struct btrfs_extent_owner_ref);
	root_id = btrfs_extent_owner_ref_root_id(eb, oref);

	printf("\t\textent owner root %llu\n", root_id);
}

static void print_free_space_info(struct extent_buffer *eb, int slot)
{
	struct btrfs_free_space_info *free_info;

	free_info = btrfs_item_ptr(eb, slot, struct btrfs_free_space_info);
	printf("\t\tfree space info extent count %u flags %u\n",
		(unsigned)btrfs_free_space_extent_count(eb, free_info),
		(unsigned)btrfs_free_space_flags(eb, free_info));
}

static void print_dev_extent(struct extent_buffer *eb, int slot)
{
	struct btrfs_dev_extent *dev_extent;
	u8 uuid[BTRFS_UUID_SIZE];
	char uuid_str[BTRFS_UUID_UNPARSED_SIZE];

	dev_extent = btrfs_item_ptr(eb, slot, struct btrfs_dev_extent);
	read_extent_buffer(eb, uuid,
		(unsigned long)btrfs_dev_extent_chunk_tree_uuid(dev_extent),
		BTRFS_UUID_SIZE);
	uuid_unparse(uuid, uuid_str);
	printf("\t\tdev extent chunk_tree %llu\n"
		"\t\tchunk_objectid %llu chunk_offset %llu "
		"length %llu\n"
		"\t\tchunk_tree_uuid %s\n",
		(unsigned long long)btrfs_dev_extent_chunk_tree(eb, dev_extent),
		(unsigned long long)btrfs_dev_extent_chunk_objectid(eb, dev_extent),
		(unsigned long long)btrfs_dev_extent_chunk_offset(eb, dev_extent),
		(unsigned long long)btrfs_dev_extent_length(eb, dev_extent),
		uuid_str);
}

static void print_qgroup_status(struct extent_buffer *eb, int slot)
{
	struct btrfs_qgroup_status_item *qg_status;
	char flags_str[256];

	qg_status = btrfs_item_ptr(eb, slot, struct btrfs_qgroup_status_item);
	memset(flags_str, 0, sizeof(flags_str));
	qgroup_flags_to_str(btrfs_qgroup_status_flags(eb, qg_status),
					flags_str);
	printf("\t\tversion %llu generation %llu flags %s scan %llu",
		(unsigned long long)btrfs_qgroup_status_version(eb, qg_status),
		(unsigned long long)btrfs_qgroup_status_generation(eb, qg_status),
		flags_str,
		(unsigned long long)btrfs_qgroup_status_rescan(eb, qg_status));
	if (btrfs_fs_incompat(eb->fs_info, SIMPLE_QUOTA))
		printf(" enable_gen %llu\n",
			   (unsigned long long)btrfs_qgroup_status_enable_gen(eb, qg_status));
	else
		printf("\n");
}

static void print_qgroup_info(struct extent_buffer *eb, int slot)
{
	struct btrfs_qgroup_info_item *qg_info;

	qg_info = btrfs_item_ptr(eb, slot, struct btrfs_qgroup_info_item);
	printf("\t\tgeneration %llu\n"
		"\t\treferenced %llu referenced_compressed %llu\n"
		"\t\texclusive %llu exclusive_compressed %llu\n",
		(unsigned long long)btrfs_qgroup_info_generation(eb, qg_info),
		(unsigned long long)btrfs_qgroup_info_rfer(eb, qg_info),
		(unsigned long long)btrfs_qgroup_info_rfer_cmpr(eb, qg_info),
		(unsigned long long)btrfs_qgroup_info_excl(eb, qg_info),
		(unsigned long long)btrfs_qgroup_info_excl_cmpr(eb, qg_info));
}

static void print_qgroup_limit(struct extent_buffer *eb, int slot)
{
	struct btrfs_qgroup_limit_item *qg_limit;

	qg_limit = btrfs_item_ptr(eb, slot, struct btrfs_qgroup_limit_item);
	printf("\t\tflags %llx\n"
		"\t\tmax_referenced %lld max_exclusive %lld\n"
		"\t\trsv_referenced %lld rsv_exclusive %lld\n",
		(unsigned long long)btrfs_qgroup_limit_flags(eb, qg_limit),
		(long long)btrfs_qgroup_limit_max_rfer(eb, qg_limit),
		(long long)btrfs_qgroup_limit_max_excl(eb, qg_limit),
		(long long)btrfs_qgroup_limit_rsv_rfer(eb, qg_limit),
		(long long)btrfs_qgroup_limit_rsv_excl(eb, qg_limit));
}

static void print_persistent_item(struct extent_buffer *eb, void *ptr,
		u32 item_size, u64 objectid, u64 offset)
{
	printf("\t\tpersistent item objectid ");
	print_objectid(stdout, objectid, BTRFS_PERSISTENT_ITEM_KEY);
	printf(" offset %llu\n", (unsigned long long)offset);
	switch (objectid) {
	case BTRFS_DEV_STATS_OBJECTID:
		print_dev_stats(eb, ptr, item_size);
		break;
	default:
		printf("\t\tunknown persistent item objectid %llu\n", objectid);
	}
}

static void print_temporary_item(struct extent_buffer *eb, void *ptr,
		u64 objectid, u64 offset)
{
	printf("\t\ttemporary item objectid ");
	print_objectid(stdout, objectid, BTRFS_TEMPORARY_ITEM_KEY);
	printf(" offset %llu\n", (unsigned long long)offset);
	switch (objectid) {
	case BTRFS_BALANCE_OBJECTID:
		print_balance_item(eb, ptr);
		break;
	case BTRFS_CSUM_CHANGE_OBJECTID:
		if (offset < btrfs_get_num_csums())
			printf("\t\ttarget csum type %s (%llu)\n",
			       btrfs_super_csum_name(offset) ,offset);
		else
			printf("\t\tunknown csum type %llu\n", offset);
		break;
	default:
		printf("\t\tunknown temporary item objectid %llu\n", objectid);
	}
}

static void print_extent_csum(struct extent_buffer *eb,
		int item_size, u64 offset, void *ptr, bool print_csum_items)
{
	struct btrfs_fs_info *fs_info = eb->fs_info;
	u32 size;
	int csum_size;

	/*
	 * If we don't have fs_info, only output its start position as we
	 * don't have sectorsize for the calculation
	 */
	if (!fs_info) {
		printf("\t\trange start %llu\n", (unsigned long long)offset);
		return;
	}
	csum_size = fs_info->csum_size;
	size = (item_size / csum_size) * fs_info->sectorsize;
	printf("\t\trange start %llu end %llu length %u\n",
			(unsigned long long)offset,
			(unsigned long long)offset + size, size);


	/*
	 * Fill one long line, which is 1 item of sha256/blake2,
	 * 2x xxhash, 4x crc32c with format:
	 * [offset] 0xCHECKSUM [offset] 0xCHECKSUM
	 */
	if (print_csum_items) {
		const int one_line = max(1, BTRFS_CSUM_SIZE / csum_size / 2);
		int curline;
		const u8 *csum = (const u8 *)(eb->data + (unsigned long)ptr);

		curline = one_line;
		while (size > 0) {
			int i;

			if (curline == one_line) {
				printf("\t\t");
			} else if (curline == 0) {
				curline = one_line;
				printf("\n\t\t");
			} else {
				putchar(' ');
			}
			printf("[%llu] 0x", offset);
			for (i = 0; i < csum_size; i++)
				printf("%02x", *csum++);
			offset += fs_info->sectorsize;
			size -= fs_info->sectorsize;
			curline--;
		}
		putchar('\n');
	}
}

/* Caller must ensure sizeof(*ret) >= 14 "WRITTEN|RELOC" */
static void header_flags_to_str(u64 flags, char *ret)
{
	int empty = 1;

	ret[0] = 0;
	if (flags & BTRFS_HEADER_FLAG_WRITTEN) {
		empty = 0;
		strcpy(ret, "WRITTEN");
	}
	if (flags & BTRFS_HEADER_FLAG_RELOC) {
		if (!empty)
			strcat(ret, "|");
		strcat(ret, "RELOC");
	}
}

static void print_header_info(struct extent_buffer *eb, unsigned int mode)
{
	struct btrfs_fs_info *fs_info = eb->fs_info;
	char flags_str[128];
#if EXPERIMENTAL
	u8 csum[BTRFS_CSUM_SIZE];
#endif
	u64 flags;
	u32 nr;
	u8 backref_rev;
	char csum_str[2 * BTRFS_CSUM_SIZE + strlen(" csum 0x") + 1];
	int i;
	int csum_size = fs_info->csum_size;

	flags = btrfs_header_flags(eb) & ~BTRFS_BACKREF_REV_MASK;
	backref_rev = btrfs_header_flags(eb) >> BTRFS_BACKREF_REV_SHIFT;
	header_flags_to_str(flags, flags_str);
	nr = btrfs_header_nritems(eb);

	if (btrfs_header_level(eb))
		printf(
	"node %llu level %d items %u free space %u generation %llu owner ",
		       (unsigned long long)eb->start, btrfs_header_level(eb),
		       nr, (u32)BTRFS_NODEPTRS_PER_EXTENT_BUFFER(eb) - nr,
		       (unsigned long long)btrfs_header_generation(eb));
	else
		printf(
	"leaf %llu items %u free space %d generation %llu owner ",
		       (unsigned long long)btrfs_header_bytenr(eb), nr,
		       btrfs_leaf_free_space(eb),
		       (unsigned long long)btrfs_header_generation(eb));
	print_objectid(stdout, btrfs_header_owner(eb), 0);
	printf("\n");
	if (fs_info && (mode & BTRFS_PRINT_TREE_CSUM_HEADERS)) {
		char *tmp = csum_str;
		u8 *tree_csum = (u8 *)(eb->data + offsetof(struct btrfs_header, csum));

		strcpy(csum_str, " csum 0x");
		tmp = csum_str + strlen(csum_str);
		for (i = 0; i < csum_size; i++) {
			sprintf(tmp, "%02x", tree_csum[i]);
			tmp++;
			tmp++;
		}
	} else {
		/* We don't have fs_info, can't print the csum */
		csum_str[0] = 0;
	}
	printf("%s %llu flags 0x%llx(%s) backref revision %d%s\n",
	       btrfs_header_level(eb) ? "node" : "leaf",
	       btrfs_header_bytenr(eb), flags, flags_str, backref_rev,
	       csum_str);

#if EXPERIMENTAL
	printf("checksum stored ");
	for (i = 0; i < csum_size; i++)
		printf("%02hhx", (int)(eb->data[i]));
	printf("\n");
	memset(csum, 0, sizeof(csum));
	btrfs_csum_data(fs_info, btrfs_super_csum_type(fs_info->super_copy),
			(u8 *)eb->data + BTRFS_CSUM_SIZE,
			csum, fs_info->nodesize - BTRFS_CSUM_SIZE);
	printf("checksum calced ");
	for (i = 0; i < csum_size; i++)
		printf("%02hhx", (int)(csum[i]));
	printf("\n");
#endif

	print_uuids(eb);
	fflush(stdout);
}

#define DEV_REPLACE_STRING_LEN				64
#define CASE_DEV_REPLACE_MODE_ENTRY(dest, name)				\
	case BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_##name: \
		strncpy_null((dest), #name, DEV_REPLACE_STRING_LEN);	\
		break;

static void replace_mode_to_str(u64 flags, char *ret)
{
	ret[0] = 0;
	switch(flags) {
	CASE_DEV_REPLACE_MODE_ENTRY(ret, ALWAYS);
	CASE_DEV_REPLACE_MODE_ENTRY(ret, AVOID);
	default:
		snprintf(ret, DEV_REPLACE_STRING_LEN, "unknown(%llu)", flags);
	}
}
#undef DEV_REPLACE_MODE_ENTRY

#define CASE_DEV_REPLACE_STATE_ENTRY(dest, name)			\
	case BTRFS_IOCTL_DEV_REPLACE_STATE_##name:			\
		strncpy_null((dest), #name, DEV_REPLACE_STRING_LEN);	\
		break;

static void replace_state_to_str(u64 flags, char *ret)
{
	ret[0] = '\0';
	switch(flags) {
	CASE_DEV_REPLACE_STATE_ENTRY(ret, NEVER_STARTED);
	CASE_DEV_REPLACE_STATE_ENTRY(ret, FINISHED);
	CASE_DEV_REPLACE_STATE_ENTRY(ret, CANCELED);
	CASE_DEV_REPLACE_STATE_ENTRY(ret, STARTED);
	CASE_DEV_REPLACE_STATE_ENTRY(ret, SUSPENDED);
	default:
		snprintf(ret, DEV_REPLACE_STRING_LEN, "unknown(%llu)", flags);
	}
}
#undef DEV_REPLACE_STATE_ENTRY

static void print_u64_timespec(u64 timespec, const char *prefix)
{
	char time_str[256];
	struct tm tm;
	time_t time = timespec;

	localtime_r(&time, &tm);
	strftime(time_str, sizeof(time_str), "%Y-%m-%d %H:%M:%S", &tm);
	printf("%s%llu (%s)\n", prefix, timespec, time_str);
}

static void print_dev_replace_item(struct extent_buffer *eb, struct btrfs_dev_replace_item *ptr)
{
	char mode_str[DEV_REPLACE_STRING_LEN] = { 0 };
	char state_str[DEV_REPLACE_STRING_LEN] = { 0 };

	replace_mode_to_str(btrfs_dev_replace_cont_reading_from_srcdev_mode(eb, ptr),
			mode_str);
	replace_state_to_str(btrfs_dev_replace_replace_state(eb, ptr),
			     state_str);
	printf("\t\tsrc devid %lld cursor left %llu cursor right %llu mode %s\n",
		btrfs_dev_replace_src_devid(eb, ptr),
		btrfs_dev_replace_cursor_left(eb, ptr),
		btrfs_dev_replace_cursor_right(eb, ptr),
		mode_str);
	printf("\t\tstate %s write errors %llu uncorrectable read errors %llu\n",
		state_str, btrfs_dev_replace_num_write_errors(eb, ptr),
		btrfs_dev_replace_num_uncorrectable_read_errors(eb, ptr));
	print_u64_timespec(btrfs_dev_replace_time_started(eb, ptr), "\t\tstart time ");
	print_u64_timespec(btrfs_dev_replace_time_started(eb, ptr), "\t\tstop time ");
}

void __btrfs_print_leaf(struct extent_buffer *eb, unsigned int mode)
{
	struct btrfs_disk_key disk_key;
	u32 leaf_data_size = BTRFS_LEAF_DATA_SIZE(eb->fs_info);
	u32 i;
	u32 nr;
	const bool print_csum_items = (mode & BTRFS_PRINT_TREE_CSUM_ITEMS);

	print_header_info(eb, mode);
	nr = btrfs_header_nritems(eb);
	for (i = 0; i < nr; i++) {
		u32 item_size;
		void *ptr;
		u64 objectid;
		u32 type;
		u64 offset;

		/*
		 * Extra check on item pointers
		 * Here we don't need to be as strict as kernel leaf check.
		 * Only need to ensure all pointers are pointing range inside
		 * the leaf, thus no segfault.
		 */
		if (btrfs_item_offset(eb, i) > leaf_data_size ||
		    btrfs_item_size(eb, i) + btrfs_item_offset(eb, i) >
		    leaf_data_size) {
			error(
"leaf %llu slot %u pointer invalid, offset %u size %u leaf data limit %u",
			      btrfs_header_bytenr(eb), i,
			      btrfs_item_offset(eb, i),
			      btrfs_item_size(eb, i), leaf_data_size);
			error("skip remaining slots");
			break;
		}
		item_size = btrfs_item_size(eb, i);
		/* Untyped extraction of slot from btrfs_item_ptr */
		ptr = btrfs_item_ptr(eb, i, void*);

		btrfs_item_key(eb, &disk_key, i);
		objectid = btrfs_disk_key_objectid(&disk_key);
		type = btrfs_disk_key_type(&disk_key);
		offset = btrfs_disk_key_offset(&disk_key);

		printf("\titem %u ", i);
		btrfs_print_key(&disk_key);
		printf(" itemoff %u itemsize %u\n",
			btrfs_item_offset(eb, i),
			btrfs_item_size(eb, i));

		if (type == 0 && objectid == BTRFS_FREE_SPACE_OBJECTID)
			print_free_space_header(eb, i);

		switch (type) {
		case BTRFS_INODE_ITEM_KEY:
			print_inode_item(eb, ptr);
			break;
		case BTRFS_INODE_REF_KEY:
			print_inode_ref_item(eb, item_size, ptr);
			break;
		case BTRFS_INODE_EXTREF_KEY:
			print_inode_extref_item(eb, item_size, ptr);
			break;
		case BTRFS_DIR_ITEM_KEY:
		case BTRFS_DIR_INDEX_KEY:
		case BTRFS_XATTR_ITEM_KEY:
			print_dir_item(eb, item_size, ptr);
			break;
		case BTRFS_DIR_LOG_INDEX_KEY:
		case BTRFS_DIR_LOG_ITEM_KEY: {
			struct btrfs_dir_log_item *dlog;

			dlog = btrfs_item_ptr(eb, i, struct btrfs_dir_log_item);
			printf("\t\tdir log end %llu\n",
			       (unsigned long long)btrfs_dir_log_end(eb, dlog));
			break;
			}
		case BTRFS_ORPHAN_ITEM_KEY:
			printf("\t\torphan item\n");
			break;
		case BTRFS_ROOT_ITEM_KEY:
			print_root_item(eb, i);
			break;
		case BTRFS_ROOT_REF_KEY:
			print_root_ref(eb, i, "ref");
			break;
		case BTRFS_ROOT_BACKREF_KEY:
			print_root_ref(eb, i, "backref");
			break;
		case BTRFS_EXTENT_ITEM_KEY:
			print_extent_item(eb, i, 0);
			break;
		case BTRFS_METADATA_ITEM_KEY:
			print_extent_item(eb, i, 1);
			break;
		case BTRFS_TREE_BLOCK_REF_KEY:
			printf("\t\ttree block backref\n");
			break;
		case BTRFS_SHARED_BLOCK_REF_KEY:
			printf("\t\tshared block backref\n");
			break;
		case BTRFS_EXTENT_DATA_REF_KEY:
			print_extent_data_ref(eb, i);
			break;
		case BTRFS_SHARED_DATA_REF_KEY:
			print_shared_data_ref(eb, i);
			break;
		case BTRFS_EXTENT_OWNER_REF_KEY:
			print_extent_owner_ref(eb, i);
			break;
		case BTRFS_EXTENT_REF_V0_KEY:
			printf("\t\textent ref v0 (deprecated)\n");
			break;
		case BTRFS_CSUM_ITEM_KEY:
			printf("\t\tcsum item\n");
			break;
		case BTRFS_EXTENT_CSUM_KEY:
			print_extent_csum(eb, item_size, offset, ptr, print_csum_items);
			break;
		case BTRFS_EXTENT_DATA_KEY:
			print_file_extent_item(eb, i, ptr);
			break;
		case BTRFS_BLOCK_GROUP_ITEM_KEY:
			print_block_group_item(eb, ptr);
			break;
		case BTRFS_FREE_SPACE_INFO_KEY:
			print_free_space_info(eb, i);
			break;
		case BTRFS_FREE_SPACE_EXTENT_KEY:
			printf("\t\tfree space extent\n");
			break;
		case BTRFS_FREE_SPACE_BITMAP_KEY:
			printf("\t\tfree space bitmap\n");
			break;
		case BTRFS_CHUNK_ITEM_KEY:
			print_chunk_item(eb, ptr);
			break;
		case BTRFS_DEV_ITEM_KEY:
			print_dev_item(eb, ptr);
			break;
		case BTRFS_DEV_EXTENT_KEY:
			print_dev_extent(eb, i);
			break;
		case BTRFS_QGROUP_STATUS_KEY:
			print_qgroup_status(eb, i);
			break;
		case BTRFS_QGROUP_RELATION_KEY:
			break;
		case BTRFS_QGROUP_INFO_KEY:
			print_qgroup_info(eb, i);
			break;
		case BTRFS_QGROUP_LIMIT_KEY:
			print_qgroup_limit(eb, i);
			break;
		case BTRFS_UUID_KEY_SUBVOL:
		case BTRFS_UUID_KEY_RECEIVED_SUBVOL:
			print_uuid_item(eb, btrfs_item_ptr_offset(eb, i),
					btrfs_item_size(eb, i));
			break;
		case BTRFS_STRING_ITEM_KEY: {
			const char *str = eb->data + btrfs_item_ptr_offset(eb, i);

			printf("\t\titem data %.*s\n", item_size, str);
			break;
			}
		case BTRFS_PERSISTENT_ITEM_KEY:
			print_persistent_item(eb, ptr, item_size, objectid,
					offset);
			break;
		case BTRFS_TEMPORARY_ITEM_KEY:
			print_temporary_item(eb, ptr, objectid, offset);
			break;
		case BTRFS_RAID_STRIPE_KEY:
			print_raid_stripe_key(eb, item_size, ptr);
			break;
		case BTRFS_DEV_REPLACE_KEY:
			print_dev_replace_item(eb, ptr);
			break;
		};
		fflush(stdout);
	}
}

/* Helper function to reach the leftmost tree block at @path->lowest_level */
static int search_leftmost_tree_block(struct btrfs_fs_info *fs_info,
				      struct btrfs_path *path, int root_level)
{
	int i;
	int ret = 0;

	/* Release all nodes except path->nodes[root_level] */
	for (i = 0; i < root_level; i++) {
		path->slots[i] = 0;
		if (!path->nodes[i])
			continue;
		free_extent_buffer(path->nodes[i]);
	}

	/* Reach the leftmost tree block by always reading out slot 0 */
	for (i = root_level; i > path->lowest_level; i--) {
		struct extent_buffer *eb;

		path->slots[i] = 0;
		eb = btrfs_read_node_slot(path->nodes[i], 0);
		if (!extent_buffer_uptodate(eb)) {
			ret = -EIO;
			goto out;
		}
		path->nodes[i - 1] = eb;
	}
out:
	return ret;
}

/*
 * Walk up the tree as far as necessary to find the next sibling tree block.
 * More generic version of btrfs_next_leaf(), as it could find sibling nodes if
 * @path->lowest_level is not 0.
 *
 * Returns 0 if it found something or 1 if there are no greater leaves.
 * Returns < 0 on io errors.
 */
static int next_sibling_tree_block(struct btrfs_fs_info *fs_info,
				   struct btrfs_path *path)
{
	int slot;
	int level = path->lowest_level + 1;
	struct extent_buffer *eb;
	struct extent_buffer *next = NULL;

	BUG_ON(path->lowest_level + 1 >= BTRFS_MAX_LEVEL);
	do {
		if (!path->nodes[level])
			return 1;

		slot = path->slots[level] + 1;
		eb = path->nodes[level];
		if (slot >= btrfs_header_nritems(eb)) {
			level++;
			if (level == BTRFS_MAX_LEVEL)
				return 1;
			continue;
		}

		next = btrfs_read_node_slot(eb, slot);
		if (!extent_buffer_uptodate(next))
			return -EIO;
		break;
	} while (level < BTRFS_MAX_LEVEL);
	path->slots[level] = slot;
	while(1) {
		level--;
		eb = path->nodes[level];
		free_extent_buffer(eb);
		path->nodes[level] = next;
		path->slots[level] = 0;
		if (level == path->lowest_level)
			break;
		next = btrfs_read_node_slot(next, 0);
		if (!extent_buffer_uptodate(next))
			return -EIO;
	}
	return 0;
}

static void bfs_print_children(struct extent_buffer *root_eb, unsigned int mode)
{
	struct btrfs_fs_info *fs_info = root_eb->fs_info;
	struct btrfs_path path = { 0 };
	int root_level = btrfs_header_level(root_eb);
	int cur_level;
	int ret;

	if (root_level < 1)
		return;

	mode &= ~(BTRFS_PRINT_TREE_FOLLOW);
	mode |= BTRFS_PRINT_TREE_BFS;
	mode &= ~(BTRFS_PRINT_TREE_DFS);

	/* For path */
	extent_buffer_get(root_eb);
	path.nodes[root_level] = root_eb;

	for (cur_level = root_level - 1; cur_level >= 0; cur_level--) {
		path.lowest_level = cur_level;

		/* Use the leftmost tree block as a starting point */
		ret = search_leftmost_tree_block(fs_info, &path, root_level);
		if (ret < 0)
			goto out;

		/* Print all sibling tree blocks */
		while (1) {
			btrfs_print_tree(path.nodes[cur_level], mode);
			ret = next_sibling_tree_block(fs_info, &path);
			if (ret < 0)
				goto out;
			if (ret > 0) {
				ret = 0;
				break;
			}
		}
	}
out:
	btrfs_release_path(&path);
	return;
}

static void dfs_print_children(struct extent_buffer *root_eb, unsigned int mode)
{
	struct btrfs_fs_info *fs_info = root_eb->fs_info;
	struct extent_buffer *next;
	int nr = btrfs_header_nritems(root_eb);
	int root_eb_level = btrfs_header_level(root_eb);
	int i;

	mode |= BTRFS_PRINT_TREE_FOLLOW;
	mode |= BTRFS_PRINT_TREE_DFS;
	mode &= ~(BTRFS_PRINT_TREE_BFS);

	for (i = 0; i < nr; i++) {
		struct btrfs_tree_parent_check check = {
			.owner_root = btrfs_header_owner(root_eb),
			.transid = btrfs_node_ptr_generation(root_eb, i),
			.level = root_eb_level,
		};
		next = read_tree_block(fs_info, btrfs_node_blockptr(root_eb, i),
				       &check);
		if (!extent_buffer_uptodate(next)) {
			fprintf(stderr, "failed to read %llu in tree %llu\n",
				btrfs_node_blockptr(root_eb, i),
				btrfs_header_owner(root_eb));
			continue;
		}
		if (btrfs_header_level(next) != root_eb_level - 1) {
			warning(
"eb corrupted: parent bytenr %llu slot %d level %d child bytenr %llu level has %d expect %d, skipping the slot",
				btrfs_header_bytenr(root_eb), i, root_eb_level,
				btrfs_header_bytenr(next),
				btrfs_header_level(next), root_eb_level - 1);
			free_extent_buffer(next);
			continue;
		}
		btrfs_print_tree(next, mode);
		free_extent_buffer(next);
	}
}

/*
 * Print a tree block (applies to both node and leaf).
 *
 * @eb:		tree block where to start
 * @mode:	bits setting mode of operation, see BTRFS_PRINT_TREE_*
 */
void btrfs_print_tree(struct extent_buffer *eb, unsigned int mode)
{
	u32 i;
	u32 nr;
	u32 ptr_num;
	struct btrfs_fs_info *fs_info = eb->fs_info;
	struct btrfs_disk_key disk_key;
	struct btrfs_key key;
	const bool follow = (mode & BTRFS_PRINT_TREE_FOLLOW);
	unsigned int traverse = BTRFS_PRINT_TREE_DEFAULT;

	/* BFS is default and takes precedence if both are set */
	if (mode & BTRFS_PRINT_TREE_DFS)
		traverse = BTRFS_PRINT_TREE_DFS;
	if (mode & BTRFS_PRINT_TREE_BFS)
		traverse = BTRFS_PRINT_TREE_BFS;

	nr = btrfs_header_nritems(eb);
	if (btrfs_is_leaf(eb)) {
		__btrfs_print_leaf(eb, mode);
		return;
	}
	/* We are crossing eb boundary, this node must be corrupted */
	if (nr > BTRFS_NODEPTRS_PER_EXTENT_BUFFER(eb))
		warning(
		"node nr_items corrupted, has %u limit %u, continue anyway",
			nr, BTRFS_NODEPTRS_PER_EXTENT_BUFFER(eb));
	print_header_info(eb, mode);
	ptr_num = BTRFS_NODEPTRS_PER_EXTENT_BUFFER(eb);
	for (i = 0; i < nr && i < ptr_num; i++) {
		u64 blocknr = btrfs_node_blockptr(eb, i);

		btrfs_node_key(eb, &disk_key, i);
		btrfs_disk_key_to_cpu(&key, &disk_key);
		printf("\t");
		btrfs_print_key(&disk_key);
		printf(" block %llu gen %llu\n",
		       (unsigned long long)blocknr,
		       (unsigned long long)btrfs_node_ptr_generation(eb, i));
		fflush(stdout);
	}
	if (!follow)
		return;

	if (follow && !fs_info)
		return;

	/* Keep non-traversal modes */
	mode &= ~(BTRFS_PRINT_TREE_DFS | BTRFS_PRINT_TREE_BFS);
	if (traverse == BTRFS_PRINT_TREE_DFS) {
		dfs_print_children(eb, mode);
	} else {
		bfs_print_children(eb, mode);
	}
}

static bool is_valid_csum_type(u16 csum_type)
{
	switch (csum_type) {
	case BTRFS_CSUM_TYPE_CRC32:
	case BTRFS_CSUM_TYPE_XXHASH:
	case BTRFS_CSUM_TYPE_SHA256:
	case BTRFS_CSUM_TYPE_BLAKE2:
		return true;
	default:
		return false;
	}
}

static int check_csum_sblock(void *sb, int csum_size, u16 csum_type)
{
	u8 result[BTRFS_CSUM_SIZE];

	btrfs_csum_data(NULL, csum_type, (u8 *)sb + BTRFS_CSUM_SIZE,
			result, BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);

	return !memcmp(sb, result, csum_size);
}

struct readable_flag_entry {
	u64 bit;
	char *output;
};

#define DEF_COMPAT_RO_FLAG_ENTRY(bit_name)		\
	{BTRFS_FEATURE_COMPAT_RO_##bit_name, #bit_name}

static struct readable_flag_entry compat_ro_flags_array[] = {
	DEF_COMPAT_RO_FLAG_ENTRY(FREE_SPACE_TREE),
	DEF_COMPAT_RO_FLAG_ENTRY(FREE_SPACE_TREE_VALID),
	DEF_COMPAT_RO_FLAG_ENTRY(BLOCK_GROUP_TREE),
};
static const int compat_ro_flags_num = sizeof(compat_ro_flags_array) /
				       sizeof(struct readable_flag_entry);

#define DEF_INCOMPAT_FLAG_ENTRY(bit_name)		\
	{BTRFS_FEATURE_INCOMPAT_##bit_name, #bit_name}

static struct readable_flag_entry incompat_flags_array[] = {
	DEF_INCOMPAT_FLAG_ENTRY(MIXED_BACKREF),
	DEF_INCOMPAT_FLAG_ENTRY(DEFAULT_SUBVOL),
	DEF_INCOMPAT_FLAG_ENTRY(MIXED_GROUPS),
	DEF_INCOMPAT_FLAG_ENTRY(COMPRESS_LZO),
	DEF_INCOMPAT_FLAG_ENTRY(COMPRESS_ZSTD),
	DEF_INCOMPAT_FLAG_ENTRY(BIG_METADATA),
	DEF_INCOMPAT_FLAG_ENTRY(EXTENDED_IREF),
	DEF_INCOMPAT_FLAG_ENTRY(RAID56),
	DEF_INCOMPAT_FLAG_ENTRY(SKINNY_METADATA),
	DEF_INCOMPAT_FLAG_ENTRY(NO_HOLES),
	DEF_INCOMPAT_FLAG_ENTRY(METADATA_UUID),
	DEF_INCOMPAT_FLAG_ENTRY(RAID1C34),
	DEF_INCOMPAT_FLAG_ENTRY(ZONED),
	DEF_INCOMPAT_FLAG_ENTRY(EXTENT_TREE_V2),
	DEF_INCOMPAT_FLAG_ENTRY(RAID_STRIPE_TREE),
	DEF_INCOMPAT_FLAG_ENTRY(SIMPLE_QUOTA),
};
static const int incompat_flags_num = sizeof(incompat_flags_array) /
				      sizeof(struct readable_flag_entry);

#define DEF_HEADER_FLAG_ENTRY(bit_name)			\
	{BTRFS_HEADER_FLAG_##bit_name, #bit_name}
#define DEF_SUPER_FLAG_ENTRY(bit_name)			\
	{BTRFS_SUPER_FLAG_##bit_name, #bit_name}

static struct readable_flag_entry super_flags_array[] = {
	DEF_HEADER_FLAG_ENTRY(WRITTEN),
	DEF_HEADER_FLAG_ENTRY(RELOC),
	DEF_SUPER_FLAG_ENTRY(CHANGING_FSID),
	DEF_SUPER_FLAG_ENTRY(CHANGING_FSID_V2),
	DEF_SUPER_FLAG_ENTRY(SEEDING),
	DEF_SUPER_FLAG_ENTRY(METADUMP),
	DEF_SUPER_FLAG_ENTRY(METADUMP_V2),
	DEF_SUPER_FLAG_ENTRY(CHANGING_BG_TREE),
	DEF_SUPER_FLAG_ENTRY(CHANGING_DATA_CSUM),
	DEF_SUPER_FLAG_ENTRY(CHANGING_META_CSUM),
};
static const int super_flags_num = ARRAY_SIZE(super_flags_array);

static void __print_readable_flag(u64 flag, struct readable_flag_entry *array,
				  int array_size, u64 supported_flags)
{
	int i;
	int first = 1;
	struct readable_flag_entry *entry;

	if (!flag)
		return;

	printf("\t\t\t( ");
	for (i = 0; i < array_size; i++) {
		entry = array + i;
		if ((flag & supported_flags) && (flag & entry->bit)) {
			if (first)
				printf("%s ", entry->output);
			else
				printf("|\n\t\t\t  %s ", entry->output);
			first = 0;
		}
	}
	flag &= ~supported_flags;
	if (flag) {
		if (first)
			printf("unknown flag: 0x%llx ", flag);
		else
			printf("|\n\t\t\t  unknown flag: 0x%llx ", flag);
	}
	printf(")\n");
}

static void print_readable_compat_ro_flag(u64 flag)
{
	u64 print_flags = 0;

	for (int i = 0; i < compat_ro_flags_num; i++)
		print_flags |= compat_ro_flags_array[i].bit;
	return __print_readable_flag(flag, compat_ro_flags_array,
				     compat_ro_flags_num,
				     print_flags);
}

static void print_readable_incompat_flag(u64 flag)
{
	u64 print_flags = 0;

	for (int i = 0; i < incompat_flags_num; i++)
		print_flags |= incompat_flags_array[i].bit;
	return __print_readable_flag(flag, incompat_flags_array,
				     incompat_flags_num, print_flags);
}

static void print_readable_super_flag(u64 flag)
{
	u64 print_flags = 0;

	for (int i = 0; i < super_flags_num; i++)
		print_flags |= super_flags_array[i].bit;
	return __print_readable_flag(flag, super_flags_array,
				     super_flags_num, print_flags);
}

static void print_sys_chunk_array(struct btrfs_super_block *sb)
{
	struct extent_buffer *buf;
	struct btrfs_disk_key *disk_key;
	struct btrfs_chunk *chunk;
	u8 *array_ptr;
	unsigned long sb_array_offset;
	u32 num_stripes;
	u32 array_size;
	u32 len = 0;
	u32 cur_offset;
	struct btrfs_key key;
	int item;

	buf = alloc_dummy_extent_buffer(NULL, 0, BTRFS_SUPER_INFO_SIZE);
	if (!buf) {
		error_msg(ERROR_MSG_MEMORY, NULL);
		return;
	}
	write_extent_buffer(buf, sb, 0, sizeof(*sb));
	buf->len = sizeof(*sb);
	array_size = btrfs_super_sys_array_size(sb);

	array_ptr = sb->sys_chunk_array;
	sb_array_offset = offsetof(struct btrfs_super_block, sys_chunk_array);

	if (array_size > BTRFS_SYSTEM_CHUNK_ARRAY_SIZE) {
		error("sys_array_size %u shouldn't exceed %u bytes",
				array_size, BTRFS_SYSTEM_CHUNK_ARRAY_SIZE);
		goto out;
	}

	cur_offset = 0;
	item = 0;

	while (cur_offset < array_size) {
		disk_key = (struct btrfs_disk_key *)array_ptr;
		len = sizeof(*disk_key);
		if (cur_offset + len > array_size)
			goto out_short_read;

		btrfs_disk_key_to_cpu(&key, disk_key);

		array_ptr += len;
		sb_array_offset += len;
		cur_offset += len;

		printf("\titem %d ", item);
		btrfs_print_key(disk_key);
		putchar('\n');

		if (key.type == BTRFS_CHUNK_ITEM_KEY) {
			chunk = (struct btrfs_chunk *)sb_array_offset;
			/*
			 * At least one btrfs_chunk with one stripe must be
			 * present, exact stripe count check comes afterwards
			 */
			len = btrfs_chunk_item_size(1);
			if (cur_offset + len > array_size)
				goto out_short_read;

			num_stripes = btrfs_chunk_num_stripes(buf, chunk);
			if (!num_stripes) {
				error(
			"invalid number of stripes %u in sys_array at offset %u",
					num_stripes, cur_offset);
				break;
			}
			len = btrfs_chunk_item_size(num_stripes);
			if (cur_offset + len > array_size)
				goto out_short_read;
			print_chunk_item(buf, chunk);
		} else {
			error("unexpected item type %u in sys_array at offset %u",
				(u32)key.type, cur_offset);
			break;
		}
		array_ptr += len;
		sb_array_offset += len;
		cur_offset += len;

		item++;
	}

out:
	free_extent_buffer(buf);
	return;

out_short_read:
	error("sys_array too short to read %u bytes at offset %u",
			len, cur_offset);
	free_extent_buffer(buf);
}

static int empty_backup(struct btrfs_root_backup *backup)
{
	if (backup == NULL ||
		(backup->tree_root == 0 &&
		 backup->tree_root_gen == 0))
		return 1;
	return 0;
}

static void print_root_backup(struct btrfs_root_backup *backup,
			      bool extent_tree_v2)
{
	const char *extent_tree_str = "backup_extent_root";

	if (extent_tree_v2)
		extent_tree_str = "backup_block_group_root";

	printf("\t\tbackup_tree_root:\t%llu\tgen: %llu\tlevel: %d\n",
			btrfs_backup_tree_root(backup),
			btrfs_backup_tree_root_gen(backup),
			btrfs_backup_tree_root_level(backup));
	printf("\t\tbackup_chunk_root:\t%llu\tgen: %llu\tlevel: %d\n",
			btrfs_backup_chunk_root(backup),
			btrfs_backup_chunk_root_gen(backup),
			btrfs_backup_chunk_root_level(backup));
	printf("\t\t%s:\t%llu\tgen: %llu\tlevel: %d\n",
			extent_tree_str,
			btrfs_backup_extent_root(backup),
			btrfs_backup_extent_root_gen(backup),
			btrfs_backup_extent_root_level(backup));
	printf("\t\tbackup_fs_root:\t\t%llu\tgen: %llu\tlevel: %d\n",
			btrfs_backup_fs_root(backup),
			btrfs_backup_fs_root_gen(backup),
			btrfs_backup_fs_root_level(backup));
	printf("\t\tbackup_dev_root:\t%llu\tgen: %llu\tlevel: %d\n",
			btrfs_backup_dev_root(backup),
			btrfs_backup_dev_root_gen(backup),
			btrfs_backup_dev_root_level(backup));
	printf("\t\tcsum_root:\t%llu\tgen: %llu\tlevel: %d\n",
			btrfs_backup_csum_root(backup),
			btrfs_backup_csum_root_gen(backup),
			btrfs_backup_csum_root_level(backup));

	printf("\t\tbackup_total_bytes:\t%llu\n",
					btrfs_backup_total_bytes(backup));
	printf("\t\tbackup_bytes_used:\t%llu\n",
					btrfs_backup_bytes_used(backup));
	printf("\t\tbackup_num_devices:\t%llu\n",
					btrfs_backup_num_devices(backup));
	putchar('\n');
}

static void print_backup_roots(struct btrfs_super_block *sb)
{
	struct btrfs_root_backup *backup;
	int i;
	bool extent_tree_v2 = (btrfs_super_incompat_flags(sb) &
		BTRFS_FEATURE_INCOMPAT_EXTENT_TREE_V2);

	for (i = 0; i < BTRFS_NUM_BACKUP_ROOTS; i++) {
		backup = sb->super_roots + i;
		if (!empty_backup(backup)) {
			printf("\tbackup %d:\n", i);
			print_root_backup(backup, extent_tree_v2);
		}
	}
}

void btrfs_print_superblock(struct btrfs_super_block *sb, int full)
{
	int i;
	char *s, buf[BTRFS_UUID_UNPARSED_SIZE];
	u8 *p;
	u32 csum_size;
	u16 csum_type;
	bool metadata_uuid_present = (btrfs_super_incompat_flags(sb) &
		BTRFS_FEATURE_INCOMPAT_METADATA_UUID);
	int cmp_res = 0;


	csum_type = btrfs_super_csum_type(sb);
	csum_size = BTRFS_CSUM_SIZE;
	printf("csum_type\t\t%hu (", csum_type);
	if (!is_valid_csum_type(csum_type)) {
		printf("INVALID");
	} else {
		printf("%s", btrfs_super_csum_name(csum_type));
		csum_size = btrfs_super_csum_size(sb);
	}
	printf(")\n");
	printf("csum_size\t\t%llu\n", (unsigned long long)csum_size);

	printf("csum\t\t\t0x");
	for (i = 0, p = sb->csum; i < csum_size; i++)
		printf("%02x", p[i]);
	if (!is_valid_csum_type(csum_type))
		printf(" [UNKNOWN CSUM TYPE OR SIZE]");
	else if (check_csum_sblock(sb, csum_size, csum_type))
		printf(" [match]");
	else
		printf(" [DON'T MATCH]");
	putchar('\n');

	printf("bytenr\t\t\t%llu\n",
		(unsigned long long)btrfs_super_bytenr(sb));
	printf("flags\t\t\t0x%llx\n",
		(unsigned long long)btrfs_super_flags(sb));
	print_readable_super_flag(btrfs_super_flags(sb));

	printf("magic\t\t\t");
	s = (char *) &sb->magic;
	for (i = 0; i < 8; i++)
		putchar(isprint(s[i]) ? s[i] : '.');
	if (btrfs_super_magic(sb) == BTRFS_MAGIC)
		printf(" [match]\n");
	else
		printf(" [DON'T MATCH]\n");

	uuid_unparse(sb->fsid, buf);
	printf("fsid\t\t\t%s\n", buf);
	uuid_unparse(sb->metadata_uuid, buf);
	printf("metadata_uuid\t\t%s\n", buf);

	printf("label\t\t\t");
	s = sb->label;
	for (i = 0; i < BTRFS_LABEL_SIZE && s[i]; i++)
		putchar(isprint(s[i]) ? s[i] : '.');
	putchar('\n');

	printf("generation\t\t%llu\n",
	       (unsigned long long)btrfs_super_generation(sb));
	printf("root\t\t\t%llu\n", (unsigned long long)btrfs_super_root(sb));
	printf("sys_array_size\t\t%llu\n",
	       (unsigned long long)btrfs_super_sys_array_size(sb));
	printf("chunk_root_generation\t%llu\n",
	       (unsigned long long)btrfs_super_chunk_root_generation(sb));
	printf("root_level\t\t%llu\n",
	       (unsigned long long)btrfs_super_root_level(sb));
	printf("chunk_root\t\t%llu\n",
	       (unsigned long long)btrfs_super_chunk_root(sb));
	printf("chunk_root_level\t%llu\n",
	       (unsigned long long)btrfs_super_chunk_root_level(sb));
	printf("log_root\t\t%llu\n",
	       (unsigned long long)btrfs_super_log_root(sb));
	printf("log_root_transid (deprecated)\t%llu\n",
	       le64_to_cpu(sb->__unused_log_root_transid));
	printf("log_root_level\t\t%llu\n",
	       (unsigned long long)btrfs_super_log_root_level(sb));
	printf("total_bytes\t\t%llu\n",
	       (unsigned long long)btrfs_super_total_bytes(sb));
	printf("bytes_used\t\t%llu\n",
	       (unsigned long long)btrfs_super_bytes_used(sb));
	printf("sectorsize\t\t%llu\n",
	       (unsigned long long)btrfs_super_sectorsize(sb));
	printf("nodesize\t\t%llu\n",
	       (unsigned long long)btrfs_super_nodesize(sb));
	printf("leafsize (deprecated)\t%u\n",
	       le32_to_cpu(sb->__unused_leafsize));
	printf("stripesize\t\t%llu\n",
	       (unsigned long long)btrfs_super_stripesize(sb));
	printf("root_dir\t\t%llu\n",
	       (unsigned long long)btrfs_super_root_dir(sb));
	printf("num_devices\t\t%llu\n",
	       (unsigned long long)btrfs_super_num_devices(sb));
	printf("compat_flags\t\t0x%llx\n",
	       (unsigned long long)btrfs_super_compat_flags(sb));
	printf("compat_ro_flags\t\t0x%llx\n",
	       (unsigned long long)btrfs_super_compat_ro_flags(sb));
	print_readable_compat_ro_flag(btrfs_super_compat_ro_flags(sb));
	printf("incompat_flags\t\t0x%llx\n",
	       (unsigned long long)btrfs_super_incompat_flags(sb));
	print_readable_incompat_flag(btrfs_super_incompat_flags(sb));
	printf("cache_generation\t%llu\n",
	       (unsigned long long)btrfs_super_cache_generation(sb));
	printf("uuid_tree_generation\t%llu\n",
	       (unsigned long long)btrfs_super_uuid_tree_generation(sb));

	uuid_unparse(sb->dev_item.uuid, buf);
	printf("dev_item.uuid\t\t%s\n", buf);

	uuid_unparse(sb->dev_item.fsid, buf);
	if (metadata_uuid_present) {
		cmp_res = !memcmp(sb->dev_item.fsid, sb->metadata_uuid,
				 BTRFS_FSID_SIZE);
	} else {
		cmp_res = !memcmp(sb->dev_item.fsid, sb->fsid, BTRFS_FSID_SIZE);
	}
	printf("dev_item.fsid\t\t%s %s\n", buf,
	       cmp_res ? "[match]" : "[DON'T MATCH]");

	printf("dev_item.type\t\t%llu\n", (unsigned long long)
	       btrfs_stack_device_type(&sb->dev_item));
	printf("dev_item.total_bytes\t%llu\n", (unsigned long long)
	       btrfs_stack_device_total_bytes(&sb->dev_item));
	printf("dev_item.bytes_used\t%llu\n", (unsigned long long)
	       btrfs_stack_device_bytes_used(&sb->dev_item));
	printf("dev_item.io_align\t%u\n", (unsigned int)
	       btrfs_stack_device_io_align(&sb->dev_item));
	printf("dev_item.io_width\t%u\n", (unsigned int)
	       btrfs_stack_device_io_width(&sb->dev_item));
	printf("dev_item.sector_size\t%u\n", (unsigned int)
	       btrfs_stack_device_sector_size(&sb->dev_item));
	printf("dev_item.devid\t\t%llu\n",
	       btrfs_stack_device_id(&sb->dev_item));
	printf("dev_item.dev_group\t%u\n", (unsigned int)
	       btrfs_stack_device_group(&sb->dev_item));
	printf("dev_item.seek_speed\t%u\n", (unsigned int)
	       btrfs_stack_device_seek_speed(&sb->dev_item));
	printf("dev_item.bandwidth\t%u\n", (unsigned int)
	       btrfs_stack_device_bandwidth(&sb->dev_item));
	printf("dev_item.generation\t%llu\n", (unsigned long long)
	       btrfs_stack_device_generation(&sb->dev_item));
	if (full) {
		printf("sys_chunk_array[%d]:\n", BTRFS_SYSTEM_CHUNK_ARRAY_SIZE);
		print_sys_chunk_array(sb);
		printf("backup_roots[%d]:\n", BTRFS_NUM_BACKUP_ROOTS);
		print_backup_roots(sb);
	}
}