fs/btrfs/print-tree.c - kernel/msm-4.9 - Gitiles

 /*
  * 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 "ctree.h"
 #include "disk-io.h"
 #include "print-tree.h"

 static void print_chunk(struct extent_buffer *eb, struct btrfs_chunk *chunk)
 {
 	int num_stripes = btrfs_chunk_num_stripes(eb, chunk);
 	int i;
 	printk(KERN_INFO "\t\tchunk length %llu owner %llu type %llu "
 	       "num_stripes %d\n",
 	       btrfs_chunk_length(eb, chunk), btrfs_chunk_owner(eb, chunk),
 	       btrfs_chunk_type(eb, chunk), num_stripes);
 	for (i = 0 ; i < num_stripes ; i++) {
 		printk(KERN_INFO "\t\t\tstripe %d devid %llu offset %llu\n", i,
 		      btrfs_stripe_devid_nr(eb, chunk, i),
 		      btrfs_stripe_offset_nr(eb, chunk, i));
 	}
 }
 static void print_dev_item(struct extent_buffer *eb,
 			   struct btrfs_dev_item *dev_item)
 {
 	printk(KERN_INFO "\t\tdev item devid %llu "
 	       "total_bytes %llu bytes used %llu\n",
 	       btrfs_device_id(eb, dev_item),
 	       btrfs_device_total_bytes(eb, dev_item),
 	       btrfs_device_bytes_used(eb, dev_item));
 }
 static void print_extent_data_ref(struct extent_buffer *eb,
 				  struct btrfs_extent_data_ref *ref)
 {
 	printk(KERN_INFO "\t\textent data backref root %llu "
 	       "objectid %llu offset %llu count %u\n",
 	       btrfs_extent_data_ref_root(eb, ref),
 	       btrfs_extent_data_ref_objectid(eb, ref),
 	       btrfs_extent_data_ref_offset(eb, ref),
 	       btrfs_extent_data_ref_count(eb, ref));
 }

 static void print_extent_item(struct extent_buffer *eb, int slot, int type)
 {
 	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;
 	u32 item_size = btrfs_item_size_nr(eb, slot);
 	u64 flags;
 	u64 offset;

 	if (item_size < sizeof(*ei)) {
 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
 		struct btrfs_extent_item_v0 *ei0;
 		BUG_ON(item_size != sizeof(*ei0));
 		ei0 = btrfs_item_ptr(eb, slot, struct btrfs_extent_item_v0);
 		printk(KERN_INFO "\t\textent refs %u\n",
 		       btrfs_extent_refs_v0(eb, ei0));
 		return;
 #else
 		BUG();
 #endif
 	}

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

 	printk(KERN_INFO "\t\textent refs %llu gen %llu flags %llu\n",
 	       btrfs_extent_refs(eb, ei), btrfs_extent_generation(eb, ei),
 	       flags);

 	if ((type == BTRFS_EXTENT_ITEM_KEY) &&
 	    flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) {
 		struct btrfs_tree_block_info *info;
 		info = (struct btrfs_tree_block_info *)(ei + 1);
 		btrfs_tree_block_key(eb, info, &key);
 		printk(KERN_INFO "\t\ttree block key (%llu %u %llu) "
 		       "level %d\n",
 		       btrfs_disk_key_objectid(&key), key.type,
 		       btrfs_disk_key_offset(&key),
 		       btrfs_tree_block_level(eb, info));
 		iref = (struct btrfs_extent_inline_ref *)(info + 1);
 	} else {
 		iref = (struct btrfs_extent_inline_ref *)(ei + 1);
 	}

 	ptr = (unsigned long)iref;
 	end = (unsigned long)ei + item_size;
 	while (ptr < end) {
 		iref = (struct btrfs_extent_inline_ref *)ptr;
 		type = btrfs_extent_inline_ref_type(eb, iref);
 		offset = btrfs_extent_inline_ref_offset(eb, iref);
 		switch (type) {
 		case BTRFS_TREE_BLOCK_REF_KEY:
 			printk(KERN_INFO "\t\ttree block backref "
 				"root %llu\n", offset);
 			break;
 		case BTRFS_SHARED_BLOCK_REF_KEY:
 			printk(KERN_INFO "\t\tshared block backref "
 				"parent %llu\n", offset);
 			break;
 		case BTRFS_EXTENT_DATA_REF_KEY:
 			dref = (struct btrfs_extent_data_ref *)(&iref->offset);
 			print_extent_data_ref(eb, dref);
 			break;
 		case BTRFS_SHARED_DATA_REF_KEY:
 			sref = (struct btrfs_shared_data_ref *)(iref + 1);
 			printk(KERN_INFO "\t\tshared data backref "
 			       "parent %llu count %u\n",
 			       offset, btrfs_shared_data_ref_count(eb, sref));
 			break;
 		default:
 			BUG();
 		}
 		ptr += btrfs_extent_inline_ref_size(type);
 	}
 	WARN_ON(ptr > end);
 }

 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
 static void print_extent_ref_v0(struct extent_buffer *eb, int slot)
 {
 	struct btrfs_extent_ref_v0 *ref0;

 	ref0 = btrfs_item_ptr(eb, slot, struct btrfs_extent_ref_v0);
 	printk("\t\textent back ref root %llu gen %llu "
 		"owner %llu num_refs %lu\n",
 		btrfs_ref_root_v0(eb, ref0),
 		btrfs_ref_generation_v0(eb, ref0),
 		btrfs_ref_objectid_v0(eb, ref0),
 		(unsigned long)btrfs_ref_count_v0(eb, ref0));
 }
 #endif

 static void print_uuid_item(struct extent_buffer *l, unsigned long offset,
 			    u32 item_size)
 {
 	if (!IS_ALIGNED(item_size, sizeof(u64))) {
 		pr_warn("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(subvol_id));
 		printk(KERN_INFO "\t\tsubvol_id %llu\n",
 		       (unsigned long long)le64_to_cpu(subvol_id));
 		item_size -= sizeof(u64);
 		offset += sizeof(u64);
 	}
 }

 void btrfs_print_leaf(struct btrfs_root *root, struct extent_buffer *l)
 {
 	int i;
 	u32 type, nr;
 	struct btrfs_item *item;
 	struct btrfs_root_item *ri;
 	struct btrfs_dir_item *di;
 	struct btrfs_inode_item *ii;
 	struct btrfs_block_group_item *bi;
 	struct btrfs_file_extent_item *fi;
 	struct btrfs_extent_data_ref *dref;
 	struct btrfs_shared_data_ref *sref;
 	struct btrfs_dev_extent *dev_extent;
 	struct btrfs_key key;
 	struct btrfs_key found_key;

 	if (!l)
 		return;

 	nr = btrfs_header_nritems(l);

 	btrfs_info(root->fs_info, "leaf %llu total ptrs %d free space %d",
 		   btrfs_header_bytenr(l), nr, btrfs_leaf_free_space(root, l));
 	for (i = 0 ; i < nr ; i++) {
 		item = btrfs_item_nr(i);
 		btrfs_item_key_to_cpu(l, &key, i);
 		type = key.type;
 		printk(KERN_INFO "\titem %d key (%llu %u %llu) itemoff %d "
 		       "itemsize %d\n",
 			i, key.objectid, type, key.offset,
 			btrfs_item_offset(l, item), btrfs_item_size(l, item));
 		switch (type) {
 		case BTRFS_INODE_ITEM_KEY:
 			ii = btrfs_item_ptr(l, i, struct btrfs_inode_item);
 			printk(KERN_INFO "\t\tinode generation %llu size %llu "
 			       "mode %o\n",
 			       btrfs_inode_generation(l, ii),
 			       btrfs_inode_size(l, ii),
 			       btrfs_inode_mode(l, ii));
 			break;
 		case BTRFS_DIR_ITEM_KEY:
 			di = btrfs_item_ptr(l, i, struct btrfs_dir_item);
 			btrfs_dir_item_key_to_cpu(l, di, &found_key);
 			printk(KERN_INFO "\t\tdir oid %llu type %u\n",
 				found_key.objectid,
 				btrfs_dir_type(l, di));
 			break;
 		case BTRFS_ROOT_ITEM_KEY:
 			ri = btrfs_item_ptr(l, i, struct btrfs_root_item);
 			printk(KERN_INFO "\t\troot data bytenr %llu refs %u\n",
 				btrfs_disk_root_bytenr(l, ri),
 				btrfs_disk_root_refs(l, ri));
 			break;
 		case BTRFS_EXTENT_ITEM_KEY:
 		case BTRFS_METADATA_ITEM_KEY:
 			print_extent_item(l, i, type);
 			break;
 		case BTRFS_TREE_BLOCK_REF_KEY:
 			printk(KERN_INFO "\t\ttree block backref\n");
 			break;
 		case BTRFS_SHARED_BLOCK_REF_KEY:
 			printk(KERN_INFO "\t\tshared block backref\n");
 			break;
 		case BTRFS_EXTENT_DATA_REF_KEY:
 			dref = btrfs_item_ptr(l, i,
 					      struct btrfs_extent_data_ref);
 			print_extent_data_ref(l, dref);
 			break;
 		case BTRFS_SHARED_DATA_REF_KEY:
 			sref = btrfs_item_ptr(l, i,
 					      struct btrfs_shared_data_ref);
 			printk(KERN_INFO "\t\tshared data backref count %u\n",
 			       btrfs_shared_data_ref_count(l, sref));
 			break;
 		case BTRFS_EXTENT_DATA_KEY:
 			fi = btrfs_item_ptr(l, i,
 					    struct btrfs_file_extent_item);
 			if (btrfs_file_extent_type(l, fi) ==
 			    BTRFS_FILE_EXTENT_INLINE) {
 				printk(KERN_INFO "\t\tinline extent data "
 				       "size %u\n",
 				       btrfs_file_extent_inline_len(l, i, fi));
 				break;
 			}
 			printk(KERN_INFO "\t\textent data disk bytenr %llu "
 			       "nr %llu\n",
 			       btrfs_file_extent_disk_bytenr(l, fi),
 			       btrfs_file_extent_disk_num_bytes(l, fi));
 			printk(KERN_INFO "\t\textent data offset %llu "
 			       "nr %llu ram %llu\n",
 			       btrfs_file_extent_offset(l, fi),
 			       btrfs_file_extent_num_bytes(l, fi),
 			       btrfs_file_extent_ram_bytes(l, fi));
 			break;
 		case BTRFS_EXTENT_REF_V0_KEY:
 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
 			print_extent_ref_v0(l, i);
 #else
 			BUG();
 #endif
 			break;
 		case BTRFS_BLOCK_GROUP_ITEM_KEY:
 			bi = btrfs_item_ptr(l, i,
 					    struct btrfs_block_group_item);
 			printk(KERN_INFO "\t\tblock group used %llu\n",
 			       btrfs_disk_block_group_used(l, bi));
 			break;
 		case BTRFS_CHUNK_ITEM_KEY:
 			print_chunk(l, btrfs_item_ptr(l, i,
 						      struct btrfs_chunk));
 			break;
 		case BTRFS_DEV_ITEM_KEY:
 			print_dev_item(l, btrfs_item_ptr(l, i,
 					struct btrfs_dev_item));
 			break;
 		case BTRFS_DEV_EXTENT_KEY:
 			dev_extent = btrfs_item_ptr(l, i,
 						    struct btrfs_dev_extent);
 			printk(KERN_INFO "\t\tdev extent chunk_tree %llu\n"
 			       "\t\tchunk objectid %llu chunk offset %llu "
 			       "length %llu\n",
 			       btrfs_dev_extent_chunk_tree(l, dev_extent),
 			       btrfs_dev_extent_chunk_objectid(l, dev_extent),
 			       btrfs_dev_extent_chunk_offset(l, dev_extent),
 			       btrfs_dev_extent_length(l, dev_extent));
 			break;
 		case BTRFS_DEV_STATS_KEY:
 			printk(KERN_INFO "\t\tdevice stats\n");
 			break;
 		case BTRFS_DEV_REPLACE_KEY:
 			printk(KERN_INFO "\t\tdev replace\n");
 			break;
 		case BTRFS_UUID_KEY_SUBVOL:
 		case BTRFS_UUID_KEY_RECEIVED_SUBVOL:
 			print_uuid_item(l, btrfs_item_ptr_offset(l, i),
 					btrfs_item_size_nr(l, i));
 			break;
 		};
 	}
 }

 void btrfs_print_tree(struct btrfs_root *root, struct extent_buffer *c)
 {
 	int i; u32 nr;
 	struct btrfs_key key;
 	int level;

 	if (!c)
 		return;
 	nr = btrfs_header_nritems(c);
 	level = btrfs_header_level(c);
 	if (level == 0) {
 		btrfs_print_leaf(root, c);
 		return;
 	}
 	btrfs_info(root->fs_info, "node %llu level %d total ptrs %d free spc %u",
 		btrfs_header_bytenr(c), level, nr,
 		(u32)BTRFS_NODEPTRS_PER_BLOCK(root) - nr);
 	for (i = 0; i < nr; i++) {
 		btrfs_node_key_to_cpu(c, &key, i);
 		printk(KERN_INFO "\tkey %d (%llu %u %llu) block %llu\n",
 		       i, key.objectid, key.type, key.offset,
 		       btrfs_node_blockptr(c, i));
 	}
 	for (i = 0; i < nr; i++) {
 		struct extent_buffer *next = read_tree_block(root,
 					btrfs_node_blockptr(c, i),
 					btrfs_node_ptr_generation(c, i));
 		if (btrfs_is_leaf(next) &&
 		   level != 1)
 			BUG();
 		if (btrfs_header_level(next) !=
 		       level - 1)
 			BUG();
 		btrfs_print_tree(root, next);
 		free_extent_buffer(next);
 	}
 }
	/*
	* 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 "ctree.h"
	#include "disk-io.h"
	#include "print-tree.h"

	static void print_chunk(struct extent_buffer eb, struct btrfs_chunk chunk)
	{
	int num_stripes = btrfs_chunk_num_stripes(eb, chunk);
	int i;
	printk(KERN_INFO "\t\tchunk length %llu owner %llu type %llu "
	"num_stripes %d\n",
	btrfs_chunk_length(eb, chunk), btrfs_chunk_owner(eb, chunk),
	btrfs_chunk_type(eb, chunk), num_stripes);
	for (i = 0 ; i < num_stripes ; i++) {
	printk(KERN_INFO "\t\t\tstripe %d devid %llu offset %llu\n", i,
	btrfs_stripe_devid_nr(eb, chunk, i),
	btrfs_stripe_offset_nr(eb, chunk, i));
	}
	}
	static void print_dev_item(struct extent_buffer *eb,
	struct btrfs_dev_item *dev_item)
	{
	printk(KERN_INFO "\t\tdev item devid %llu "
	"total_bytes %llu bytes used %llu\n",
	btrfs_device_id(eb, dev_item),
	btrfs_device_total_bytes(eb, dev_item),
	btrfs_device_bytes_used(eb, dev_item));
	}
	static void print_extent_data_ref(struct extent_buffer *eb,
	struct btrfs_extent_data_ref *ref)
	{
	printk(KERN_INFO "\t\textent data backref root %llu "
	"objectid %llu offset %llu count %u\n",
	btrfs_extent_data_ref_root(eb, ref),
	btrfs_extent_data_ref_objectid(eb, ref),
	btrfs_extent_data_ref_offset(eb, ref),
	btrfs_extent_data_ref_count(eb, ref));
	}

	static void print_extent_item(struct extent_buffer *eb, int slot, int type)
	{
	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;
	u32 item_size = btrfs_item_size_nr(eb, slot);
	u64 flags;
	u64 offset;

	if (item_size < sizeof(*ei)) {
	#ifdef BTRFS_COMPAT_EXTENT_TREE_V0
	struct btrfs_extent_item_v0 *ei0;
	BUG_ON(item_size != sizeof(*ei0));
	ei0 = btrfs_item_ptr(eb, slot, struct btrfs_extent_item_v0);
	printk(KERN_INFO "\t\textent refs %u\n",
	btrfs_extent_refs_v0(eb, ei0));
	return;
	#else
	BUG();
	#endif
	}

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

	printk(KERN_INFO "\t\textent refs %llu gen %llu flags %llu\n",
	btrfs_extent_refs(eb, ei), btrfs_extent_generation(eb, ei),
	flags);

	if ((type == BTRFS_EXTENT_ITEM_KEY) &&
	flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) {
	struct btrfs_tree_block_info *info;
	info = (struct btrfs_tree_block_info *)(ei + 1);
	btrfs_tree_block_key(eb, info, &key);
	printk(KERN_INFO "\t\ttree block key (%llu %u %llu) "
	"level %d\n",
	btrfs_disk_key_objectid(&key), key.type,
	btrfs_disk_key_offset(&key),
	btrfs_tree_block_level(eb, info));
	iref = (struct btrfs_extent_inline_ref *)(info + 1);
	} else {
	iref = (struct btrfs_extent_inline_ref *)(ei + 1);
	}

	ptr = (unsigned long)iref;
	end = (unsigned long)ei + item_size;
	while (ptr < end) {
	iref = (struct btrfs_extent_inline_ref *)ptr;
	type = btrfs_extent_inline_ref_type(eb, iref);
	offset = btrfs_extent_inline_ref_offset(eb, iref);
	switch (type) {
	case BTRFS_TREE_BLOCK_REF_KEY:
	printk(KERN_INFO "\t\ttree block backref "
	"root %llu\n", offset);
	break;
	case BTRFS_SHARED_BLOCK_REF_KEY:
	printk(KERN_INFO "\t\tshared block backref "
	"parent %llu\n", offset);
	break;
	case BTRFS_EXTENT_DATA_REF_KEY:
	dref = (struct btrfs_extent_data_ref *)(&iref->offset);
	print_extent_data_ref(eb, dref);
	break;
	case BTRFS_SHARED_DATA_REF_KEY:
	sref = (struct btrfs_shared_data_ref *)(iref + 1);
	printk(KERN_INFO "\t\tshared data backref "
	"parent %llu count %u\n",
	offset, btrfs_shared_data_ref_count(eb, sref));
	break;
	default:
	BUG();
	}
	ptr += btrfs_extent_inline_ref_size(type);
	}
	WARN_ON(ptr > end);
	}

	#ifdef BTRFS_COMPAT_EXTENT_TREE_V0
	static void print_extent_ref_v0(struct extent_buffer *eb, int slot)
	{
	struct btrfs_extent_ref_v0 *ref0;

	ref0 = btrfs_item_ptr(eb, slot, struct btrfs_extent_ref_v0);
	printk("\t\textent back ref root %llu gen %llu "
	"owner %llu num_refs %lu\n",
	btrfs_ref_root_v0(eb, ref0),
	btrfs_ref_generation_v0(eb, ref0),
	btrfs_ref_objectid_v0(eb, ref0),
	(unsigned long)btrfs_ref_count_v0(eb, ref0));
	}
	#endif

	static void print_uuid_item(struct extent_buffer *l, unsigned long offset,
	u32 item_size)
	{
	if (!IS_ALIGNED(item_size, sizeof(u64))) {
	pr_warn("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(subvol_id));
	printk(KERN_INFO "\t\tsubvol_id %llu\n",
	(unsigned long long)le64_to_cpu(subvol_id));
	item_size -= sizeof(u64);
	offset += sizeof(u64);
	}
	}

	void btrfs_print_leaf(struct btrfs_root root, struct extent_buffer l)
	{
	int i;
	u32 type, nr;
	struct btrfs_item *item;
	struct btrfs_root_item *ri;
	struct btrfs_dir_item *di;
	struct btrfs_inode_item *ii;
	struct btrfs_block_group_item *bi;
	struct btrfs_file_extent_item *fi;
	struct btrfs_extent_data_ref *dref;
	struct btrfs_shared_data_ref *sref;
	struct btrfs_dev_extent *dev_extent;
	struct btrfs_key key;
	struct btrfs_key found_key;

	if (!l)
	return;

	nr = btrfs_header_nritems(l);

	btrfs_info(root->fs_info, "leaf %llu total ptrs %d free space %d",
	btrfs_header_bytenr(l), nr, btrfs_leaf_free_space(root, l));
	for (i = 0 ; i < nr ; i++) {
	item = btrfs_item_nr(i);
	btrfs_item_key_to_cpu(l, &key, i);
	type = key.type;
	printk(KERN_INFO "\titem %d key (%llu %u %llu) itemoff %d "
	"itemsize %d\n",
	i, key.objectid, type, key.offset,
	btrfs_item_offset(l, item), btrfs_item_size(l, item));
	switch (type) {
	case BTRFS_INODE_ITEM_KEY:
	ii = btrfs_item_ptr(l, i, struct btrfs_inode_item);
	printk(KERN_INFO "\t\tinode generation %llu size %llu "
	"mode %o\n",
	btrfs_inode_generation(l, ii),
	btrfs_inode_size(l, ii),
	btrfs_inode_mode(l, ii));
	break;
	case BTRFS_DIR_ITEM_KEY:
	di = btrfs_item_ptr(l, i, struct btrfs_dir_item);
	btrfs_dir_item_key_to_cpu(l, di, &found_key);
	printk(KERN_INFO "\t\tdir oid %llu type %u\n",
	found_key.objectid,
	btrfs_dir_type(l, di));
	break;
	case BTRFS_ROOT_ITEM_KEY:
	ri = btrfs_item_ptr(l, i, struct btrfs_root_item);
	printk(KERN_INFO "\t\troot data bytenr %llu refs %u\n",
	btrfs_disk_root_bytenr(l, ri),
	btrfs_disk_root_refs(l, ri));
	break;
	case BTRFS_EXTENT_ITEM_KEY:
	case BTRFS_METADATA_ITEM_KEY:
	print_extent_item(l, i, type);
	break;
	case BTRFS_TREE_BLOCK_REF_KEY:
	printk(KERN_INFO "\t\ttree block backref\n");
	break;
	case BTRFS_SHARED_BLOCK_REF_KEY:
	printk(KERN_INFO "\t\tshared block backref\n");
	break;
	case BTRFS_EXTENT_DATA_REF_KEY:
	dref = btrfs_item_ptr(l, i,
	struct btrfs_extent_data_ref);
	print_extent_data_ref(l, dref);
	break;
	case BTRFS_SHARED_DATA_REF_KEY:
	sref = btrfs_item_ptr(l, i,
	struct btrfs_shared_data_ref);
	printk(KERN_INFO "\t\tshared data backref count %u\n",
	btrfs_shared_data_ref_count(l, sref));
	break;
	case BTRFS_EXTENT_DATA_KEY:
	fi = btrfs_item_ptr(l, i,
	struct btrfs_file_extent_item);
	if (btrfs_file_extent_type(l, fi) ==
	BTRFS_FILE_EXTENT_INLINE) {
	printk(KERN_INFO "\t\tinline extent data "
	"size %u\n",
	btrfs_file_extent_inline_len(l, i, fi));
	break;
	}
	printk(KERN_INFO "\t\textent data disk bytenr %llu "
	"nr %llu\n",
	btrfs_file_extent_disk_bytenr(l, fi),
	btrfs_file_extent_disk_num_bytes(l, fi));
	printk(KERN_INFO "\t\textent data offset %llu "
	"nr %llu ram %llu\n",
	btrfs_file_extent_offset(l, fi),
	btrfs_file_extent_num_bytes(l, fi),
	btrfs_file_extent_ram_bytes(l, fi));
	break;
	case BTRFS_EXTENT_REF_V0_KEY:
	#ifdef BTRFS_COMPAT_EXTENT_TREE_V0
	print_extent_ref_v0(l, i);
	#else
	BUG();
	#endif
	break;
	case BTRFS_BLOCK_GROUP_ITEM_KEY:
	bi = btrfs_item_ptr(l, i,
	struct btrfs_block_group_item);
	printk(KERN_INFO "\t\tblock group used %llu\n",
	btrfs_disk_block_group_used(l, bi));
	break;
	case BTRFS_CHUNK_ITEM_KEY:
	print_chunk(l, btrfs_item_ptr(l, i,
	struct btrfs_chunk));
	break;
	case BTRFS_DEV_ITEM_KEY:
	print_dev_item(l, btrfs_item_ptr(l, i,
	struct btrfs_dev_item));
	break;
	case BTRFS_DEV_EXTENT_KEY:
	dev_extent = btrfs_item_ptr(l, i,
	struct btrfs_dev_extent);
	printk(KERN_INFO "\t\tdev extent chunk_tree %llu\n"
	"\t\tchunk objectid %llu chunk offset %llu "
	"length %llu\n",
	btrfs_dev_extent_chunk_tree(l, dev_extent),
	btrfs_dev_extent_chunk_objectid(l, dev_extent),
	btrfs_dev_extent_chunk_offset(l, dev_extent),
	btrfs_dev_extent_length(l, dev_extent));
	break;
	case BTRFS_DEV_STATS_KEY:
	printk(KERN_INFO "\t\tdevice stats\n");
	break;
	case BTRFS_DEV_REPLACE_KEY:
	printk(KERN_INFO "\t\tdev replace\n");
	break;
	case BTRFS_UUID_KEY_SUBVOL:
	case BTRFS_UUID_KEY_RECEIVED_SUBVOL:
	print_uuid_item(l, btrfs_item_ptr_offset(l, i),
	btrfs_item_size_nr(l, i));
	break;
	};
	}
	}

	void btrfs_print_tree(struct btrfs_root root, struct extent_buffer c)
	{
	int i; u32 nr;
	struct btrfs_key key;
	int level;

	if (!c)
	return;
	nr = btrfs_header_nritems(c);
	level = btrfs_header_level(c);
	if (level == 0) {
	btrfs_print_leaf(root, c);
	return;
	}
	btrfs_info(root->fs_info, "node %llu level %d total ptrs %d free spc %u",
	btrfs_header_bytenr(c), level, nr,
	(u32)BTRFS_NODEPTRS_PER_BLOCK(root) - nr);
	for (i = 0; i < nr; i++) {
	btrfs_node_key_to_cpu(c, &key, i);
	printk(KERN_INFO "\tkey %d (%llu %u %llu) block %llu\n",
	i, key.objectid, key.type, key.offset,
	btrfs_node_blockptr(c, i));
	}
	for (i = 0; i < nr; i++) {
	struct extent_buffer *next = read_tree_block(root,
	btrfs_node_blockptr(c, i),
	btrfs_node_ptr_generation(c, i));
	if (btrfs_is_leaf(next) &&
	level != 1)
	BUG();
	if (btrfs_header_level(next) !=
	level - 1)
	BUG();
	btrfs_print_tree(root, next);
	free_extent_buffer(next);
	}
	}