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Commit 557ea5dd authored by Qu Wenruo's avatar Qu Wenruo Committed by David Sterba
Browse files

btrfs: Move leaf and node validation checker to tree-checker.c 



It's no doubt the comprehensive tree block checker will become larger,
so moving them into their own files is quite reasonable.

Signed-off-by: default avatarQu Wenruo <quwenruo.btrfs@gmx.com>
[ wording adjustments ]
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent 1170862d

fs/btrfs/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -9,7 +9,7 @@ btrfs-y += super.o ctree.o extent-tree.o print-tree.o root-tree.o dir-item.o \ 
	   export.o tree-log.o free-space-cache.o zlib.o lzo.o zstd.o \

	   compression.o delayed-ref.o relocation.o delayed-inode.o scrub.o \

	   reada.o backref.o ulist.o qgroup.o send.o dev-replace.o raid56.o \

	   uuid-tree.o props.o hash.o free-space-tree.o

	   uuid-tree.o props.o hash.o free-space-tree.o tree-checker.o



btrfs-$(CONFIG_BTRFS_FS_POSIX_ACL) += acl.o

btrfs-$(CONFIG_BTRFS_FS_CHECK_INTEGRITY) += check-integrity.o

fs/btrfs/disk-io.c

+4 −281
Original line number Diff line number Diff line
@@ -50,6 +50,7 @@ 
#include "sysfs.h"

#include "qgroup.h"

#include "compression.h"

#include "tree-checker.h"



#ifdef CONFIG_X86

#include <asm/cpufeature.h>
@@ -543,284 +544,6 @@ static int check_tree_block_fsid(struct btrfs_fs_info *fs_info, 
	return ret;

}



#define CORRUPT(reason, eb, root, slot)					\

	btrfs_crit(root->fs_info,					\

		   "corrupt %s, %s: block=%llu, root=%llu, slot=%d",	\

		   btrfs_header_level(eb) == 0 ? "leaf" : "node",	\

		   reason, btrfs_header_bytenr(eb), root->objectid, slot)



static int check_extent_data_item(struct btrfs_root *root,

				  struct extent_buffer *leaf,

				  struct btrfs_key *key, int slot)

{

	struct btrfs_file_extent_item *fi;

	u32 sectorsize = root->fs_info->sectorsize;

	u32 item_size = btrfs_item_size_nr(leaf, slot);



	if (!IS_ALIGNED(key->offset, sectorsize)) {

		CORRUPT("unaligned key offset for file extent",

			leaf, root, slot);

		return -EUCLEAN;

	}



	fi = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item);



	if (btrfs_file_extent_type(leaf, fi) > BTRFS_FILE_EXTENT_TYPES) {

		CORRUPT("invalid file extent type", leaf, root, slot);

		return -EUCLEAN;

	}



	/*

	 * Support for new compression/encrption must introduce incompat flag,

	 * and must be caught in open_ctree().

	 */

	if (btrfs_file_extent_compression(leaf, fi) > BTRFS_COMPRESS_TYPES) {

		CORRUPT("invalid file extent compression", leaf, root, slot);

		return -EUCLEAN;

	}

	if (btrfs_file_extent_encryption(leaf, fi)) {

		CORRUPT("invalid file extent encryption", leaf, root, slot);

		return -EUCLEAN;

	}

	if (btrfs_file_extent_type(leaf, fi) == BTRFS_FILE_EXTENT_INLINE) {

		/* Inline extent must have 0 as key offset */

		if (key->offset) {

			CORRUPT("inline extent has non-zero key offset",

				leaf, root, slot);

			return -EUCLEAN;

		}



		/* Compressed inline extent has no on-disk size, skip it */

		if (btrfs_file_extent_compression(leaf, fi) !=

		    BTRFS_COMPRESS_NONE)

			return 0;



		/* Uncompressed inline extent size must match item size */

		if (item_size != BTRFS_FILE_EXTENT_INLINE_DATA_START +

		    btrfs_file_extent_ram_bytes(leaf, fi)) {

			CORRUPT("plaintext inline extent has invalid size",

				leaf, root, slot);

			return -EUCLEAN;

		}

		return 0;

	}



	/* Regular or preallocated extent has fixed item size */

	if (item_size != sizeof(*fi)) {

		CORRUPT(

		"regluar or preallocated extent data item size is invalid",

			leaf, root, slot);

		return -EUCLEAN;

	}

	if (!IS_ALIGNED(btrfs_file_extent_ram_bytes(leaf, fi), sectorsize) ||

	    !IS_ALIGNED(btrfs_file_extent_disk_bytenr(leaf, fi), sectorsize) ||

	    !IS_ALIGNED(btrfs_file_extent_disk_num_bytes(leaf, fi), sectorsize) ||

	    !IS_ALIGNED(btrfs_file_extent_offset(leaf, fi), sectorsize) ||

	    !IS_ALIGNED(btrfs_file_extent_num_bytes(leaf, fi), sectorsize)) {

		CORRUPT(

		"regular or preallocated extent data item has unaligned value",

			leaf, root, slot);

		return -EUCLEAN;

	}



	return 0;

}



static int check_csum_item(struct btrfs_root *root, struct extent_buffer *leaf,

			   struct btrfs_key *key, int slot)

{

	u32 sectorsize = root->fs_info->sectorsize;

	u32 csumsize = btrfs_super_csum_size(root->fs_info->super_copy);



	if (key->objectid != BTRFS_EXTENT_CSUM_OBJECTID) {

		CORRUPT("invalid objectid for csum item", leaf, root, slot);

		return -EUCLEAN;

	}

	if (!IS_ALIGNED(key->offset, sectorsize)) {

		CORRUPT("unaligned key offset for csum item", leaf, root, slot);

		return -EUCLEAN;

	}

	if (!IS_ALIGNED(btrfs_item_size_nr(leaf, slot), csumsize)) {

		CORRUPT("unaligned csum item size", leaf, root, slot);

		return -EUCLEAN;

	}

	return 0;

}



/*

 * Common point to switch the item-specific validation.

 */

static int check_leaf_item(struct btrfs_root *root,

			   struct extent_buffer *leaf,

			   struct btrfs_key *key, int slot)

{

	int ret = 0;



	switch (key->type) {

	case BTRFS_EXTENT_DATA_KEY:

		ret = check_extent_data_item(root, leaf, key, slot);

		break;

	case BTRFS_EXTENT_CSUM_KEY:

		ret = check_csum_item(root, leaf, key, slot);

		break;

	}

	return ret;

}



static noinline int check_leaf(struct btrfs_root *root,

			       struct extent_buffer *leaf)

{

	struct btrfs_fs_info *fs_info = root->fs_info;

	/* No valid key type is 0, so all key should be larger than this key */

	struct btrfs_key prev_key = {0, 0, 0};

	struct btrfs_key key;

	u32 nritems = btrfs_header_nritems(leaf);

	int slot;



	/*

	 * Extent buffers from a relocation tree have a owner field that

	 * corresponds to the subvolume tree they are based on. So just from an

	 * extent buffer alone we can not find out what is the id of the

	 * corresponding subvolume tree, so we can not figure out if the extent

	 * buffer corresponds to the root of the relocation tree or not. So skip

	 * this check for relocation trees.

	 */

	if (nritems == 0 && !btrfs_header_flag(leaf, BTRFS_HEADER_FLAG_RELOC)) {

		struct btrfs_root *check_root;



		key.objectid = btrfs_header_owner(leaf);

		key.type = BTRFS_ROOT_ITEM_KEY;

		key.offset = (u64)-1;



		check_root = btrfs_get_fs_root(fs_info, &key, false);

		/*

		 * The only reason we also check NULL here is that during

		 * open_ctree() some roots has not yet been set up.

		 */

		if (!IS_ERR_OR_NULL(check_root)) {

			struct extent_buffer *eb;



			eb = btrfs_root_node(check_root);

			/* if leaf is the root, then it's fine */

			if (leaf != eb) {

				CORRUPT("non-root leaf's nritems is 0",

					leaf, check_root, 0);

				free_extent_buffer(eb);

				return -EUCLEAN;

			}

			free_extent_buffer(eb);

		}

		return 0;

	}



	if (nritems == 0)

		return 0;



	/*

	 * Check the following things to make sure this is a good leaf, and

	 * leaf users won't need to bother with similar sanity checks:

	 *

	 * 1) key order

	 * 2) item offset and size

	 *    No overlap, no hole, all inside the leaf.

	 * 3) item content

	 *    If possible, do comprehensive sanity check.

	 *    NOTE: All checks must only rely on the item data itself.

	 */

	for (slot = 0; slot < nritems; slot++) {

		u32 item_end_expected;

		int ret;



		btrfs_item_key_to_cpu(leaf, &key, slot);



		/* Make sure the keys are in the right order */

		if (btrfs_comp_cpu_keys(&prev_key, &key) >= 0) {

			CORRUPT("bad key order", leaf, root, slot);

			return -EUCLEAN;

		}



		/*

		 * Make sure the offset and ends are right, remember that the

		 * item data starts at the end of the leaf and grows towards the

		 * front.

		 */

		if (slot == 0)

			item_end_expected = BTRFS_LEAF_DATA_SIZE(fs_info);

		else

			item_end_expected = btrfs_item_offset_nr(leaf,

								 slot - 1);

		if (btrfs_item_end_nr(leaf, slot) != item_end_expected) {

			CORRUPT("slot offset bad", leaf, root, slot);

			return -EUCLEAN;

		}



		/*

		 * Check to make sure that we don't point outside of the leaf,

		 * just in case all the items are consistent to each other, but

		 * all point outside of the leaf.

		 */

		if (btrfs_item_end_nr(leaf, slot) >

		    BTRFS_LEAF_DATA_SIZE(fs_info)) {

			CORRUPT("slot end outside of leaf", leaf, root, slot);

			return -EUCLEAN;

		}



		/* Also check if the item pointer overlaps with btrfs item. */

		if (btrfs_item_nr_offset(slot) + sizeof(struct btrfs_item) >

		    btrfs_item_ptr_offset(leaf, slot)) {

			CORRUPT("slot overlap with its data", leaf, root, slot);

			return -EUCLEAN;

		}



		/* Check if the item size and content meet other criteria */

		ret = check_leaf_item(root, leaf, &key, slot);

		if (ret < 0)

			return ret;



		prev_key.objectid = key.objectid;

		prev_key.type = key.type;

		prev_key.offset = key.offset;

	}



	return 0;

}



static int check_node(struct btrfs_root *root, struct extent_buffer *node)

{

	unsigned long nr = btrfs_header_nritems(node);

	struct btrfs_key key, next_key;

	int slot;

	u64 bytenr;

	int ret = 0;



	if (nr == 0 || nr > BTRFS_NODEPTRS_PER_BLOCK(root->fs_info)) {

		btrfs_crit(root->fs_info,

			   "corrupt node: block %llu root %llu nritems %lu",

			   node->start, root->objectid, nr);

		return -EIO;

	}



	for (slot = 0; slot < nr - 1; slot++) {

		bytenr = btrfs_node_blockptr(node, slot);

		btrfs_node_key_to_cpu(node, &key, slot);

		btrfs_node_key_to_cpu(node, &next_key, slot + 1);



		if (!bytenr) {

			CORRUPT("invalid item slot", node, root, slot);

			ret = -EIO;

			goto out;

		}



		if (btrfs_comp_cpu_keys(&key, &next_key) >= 0) {

			CORRUPT("bad key order", node, root, slot);

			ret = -EIO;

			goto out;

		}

	}

out:

	return ret;

}



static int btree_readpage_end_io_hook(struct btrfs_io_bio *io_bio,

				      u64 phy_offset, struct page *page,

				      u64 start, u64 end, int mirror)
@@ -886,12 +609,12 @@ static int btree_readpage_end_io_hook(struct btrfs_io_bio *io_bio, 
	 * that we don't try and read the other copies of this block, just

	 * return -EIO.

	 */

	if (found_level == 0 && check_leaf(root, eb)) {

	if (found_level == 0 && btrfs_check_leaf(root, eb)) {

		set_bit(EXTENT_BUFFER_CORRUPT, &eb->bflags);

		ret = -EIO;

	}



	if (found_level > 0 && check_node(root, eb))

	if (found_level > 0 && btrfs_check_node(root, eb))

		ret = -EIO;



	if (!ret)
@@ -4146,7 +3869,7 @@ void btrfs_mark_buffer_dirty(struct extent_buffer *buf) 
					 buf->len,

					 fs_info->dirty_metadata_batch);

#ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY

	if (btrfs_header_level(buf) == 0 && check_leaf(root, buf)) {

	if (btrfs_header_level(buf) == 0 && btrfs_check_leaf(root, buf)) {

		btrfs_print_leaf(buf);

		ASSERT(0);

	}

fs/btrfs/tree-checker.c

0 → 100644
+309 −0
Original line number Diff line number Diff line 
/*

 * Copyright (C) Qu Wenruo 2017.  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.

 */



/*

 * The module is used to catch unexpected/corrupted tree block data.

 * Such behavior can be caused either by a fuzzed image or bugs.

 *

 * The objective is to do leaf/node validation checks when tree block is read

 * from disk, and check *every* possible member, so other code won't

 * need to checking them again.

 *

 * Due to the potential and unwanted damage, every checker needs to be

 * carefully reviewed otherwise so it does not prevent mount of valid images.

 */



#include "ctree.h"

#include "tree-checker.h"

#include "disk-io.h"

#include "compression.h"



#define CORRUPT(reason, eb, root, slot)					\

	btrfs_crit(root->fs_info,					\

		   "corrupt %s, %s: block=%llu, root=%llu, slot=%d",	\

		   btrfs_header_level(eb) == 0 ? "leaf" : "node",	\

		   reason, btrfs_header_bytenr(eb), root->objectid, slot)



static int check_extent_data_item(struct btrfs_root *root,

				  struct extent_buffer *leaf,

				  struct btrfs_key *key, int slot)

{

	struct btrfs_file_extent_item *fi;

	u32 sectorsize = root->fs_info->sectorsize;

	u32 item_size = btrfs_item_size_nr(leaf, slot);



	if (!IS_ALIGNED(key->offset, sectorsize)) {

		CORRUPT("unaligned key offset for file extent",

			leaf, root, slot);

		return -EUCLEAN;

	}



	fi = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item);



	if (btrfs_file_extent_type(leaf, fi) > BTRFS_FILE_EXTENT_TYPES) {

		CORRUPT("invalid file extent type", leaf, root, slot);

		return -EUCLEAN;

	}



	/*

	 * Support for new compression/encrption must introduce incompat flag,

	 * and must be caught in open_ctree().

	 */

	if (btrfs_file_extent_compression(leaf, fi) > BTRFS_COMPRESS_TYPES) {

		CORRUPT("invalid file extent compression", leaf, root, slot);

		return -EUCLEAN;

	}

	if (btrfs_file_extent_encryption(leaf, fi)) {

		CORRUPT("invalid file extent encryption", leaf, root, slot);

		return -EUCLEAN;

	}

	if (btrfs_file_extent_type(leaf, fi) == BTRFS_FILE_EXTENT_INLINE) {

		/* Inline extent must have 0 as key offset */

		if (key->offset) {

			CORRUPT("inline extent has non-zero key offset",

				leaf, root, slot);

			return -EUCLEAN;

		}



		/* Compressed inline extent has no on-disk size, skip it */

		if (btrfs_file_extent_compression(leaf, fi) !=

		    BTRFS_COMPRESS_NONE)

			return 0;



		/* Uncompressed inline extent size must match item size */

		if (item_size != BTRFS_FILE_EXTENT_INLINE_DATA_START +

		    btrfs_file_extent_ram_bytes(leaf, fi)) {

			CORRUPT("plaintext inline extent has invalid size",

				leaf, root, slot);

			return -EUCLEAN;

		}

		return 0;

	}



	/* Regular or preallocated extent has fixed item size */

	if (item_size != sizeof(*fi)) {

		CORRUPT(

		"regluar or preallocated extent data item size is invalid",

			leaf, root, slot);

		return -EUCLEAN;

	}

	if (!IS_ALIGNED(btrfs_file_extent_ram_bytes(leaf, fi), sectorsize) ||

	    !IS_ALIGNED(btrfs_file_extent_disk_bytenr(leaf, fi), sectorsize) ||

	    !IS_ALIGNED(btrfs_file_extent_disk_num_bytes(leaf, fi), sectorsize) ||

	    !IS_ALIGNED(btrfs_file_extent_offset(leaf, fi), sectorsize) ||

	    !IS_ALIGNED(btrfs_file_extent_num_bytes(leaf, fi), sectorsize)) {

		CORRUPT(

		"regular or preallocated extent data item has unaligned value",

			leaf, root, slot);

		return -EUCLEAN;

	}



	return 0;

}



static int check_csum_item(struct btrfs_root *root, struct extent_buffer *leaf,

			   struct btrfs_key *key, int slot)

{

	u32 sectorsize = root->fs_info->sectorsize;

	u32 csumsize = btrfs_super_csum_size(root->fs_info->super_copy);



	if (key->objectid != BTRFS_EXTENT_CSUM_OBJECTID) {

		CORRUPT("invalid objectid for csum item", leaf, root, slot);

		return -EUCLEAN;

	}

	if (!IS_ALIGNED(key->offset, sectorsize)) {

		CORRUPT("unaligned key offset for csum item", leaf, root, slot);

		return -EUCLEAN;

	}

	if (!IS_ALIGNED(btrfs_item_size_nr(leaf, slot), csumsize)) {

		CORRUPT("unaligned csum item size", leaf, root, slot);

		return -EUCLEAN;

	}

	return 0;

}



/*

 * Common point to switch the item-specific validation.

 */

static int check_leaf_item(struct btrfs_root *root,

			   struct extent_buffer *leaf,

			   struct btrfs_key *key, int slot)

{

	int ret = 0;



	switch (key->type) {

	case BTRFS_EXTENT_DATA_KEY:

		ret = check_extent_data_item(root, leaf, key, slot);

		break;

	case BTRFS_EXTENT_CSUM_KEY:

		ret = check_csum_item(root, leaf, key, slot);

		break;

	}

	return ret;

}



int btrfs_check_leaf(struct btrfs_root *root, struct extent_buffer *leaf)

{

	struct btrfs_fs_info *fs_info = root->fs_info;

	/* No valid key type is 0, so all key should be larger than this key */

	struct btrfs_key prev_key = {0, 0, 0};

	struct btrfs_key key;

	u32 nritems = btrfs_header_nritems(leaf);

	int slot;



	/*

	 * Extent buffers from a relocation tree have a owner field that

	 * corresponds to the subvolume tree they are based on. So just from an

	 * extent buffer alone we can not find out what is the id of the

	 * corresponding subvolume tree, so we can not figure out if the extent

	 * buffer corresponds to the root of the relocation tree or not. So

	 * skip this check for relocation trees.

	 */

	if (nritems == 0 && !btrfs_header_flag(leaf, BTRFS_HEADER_FLAG_RELOC)) {

		struct btrfs_root *check_root;



		key.objectid = btrfs_header_owner(leaf);

		key.type = BTRFS_ROOT_ITEM_KEY;

		key.offset = (u64)-1;



		check_root = btrfs_get_fs_root(fs_info, &key, false);

		/*

		 * The only reason we also check NULL here is that during

		 * open_ctree() some roots has not yet been set up.

		 */

		if (!IS_ERR_OR_NULL(check_root)) {

			struct extent_buffer *eb;



			eb = btrfs_root_node(check_root);

			/* if leaf is the root, then it's fine */

			if (leaf != eb) {

				CORRUPT("non-root leaf's nritems is 0",

					leaf, check_root, 0);

				free_extent_buffer(eb);

				return -EUCLEAN;

			}

			free_extent_buffer(eb);

		}

		return 0;

	}



	if (nritems == 0)

		return 0;



	/*

	 * Check the following things to make sure this is a good leaf, and

	 * leaf users won't need to bother with similar sanity checks:

	 *

	 * 1) key ordering

	 * 2) item offset and size

	 *    No overlap, no hole, all inside the leaf.

	 * 3) item content

	 *    If possible, do comprehensive sanity check.

	 *    NOTE: All checks must only rely on the item data itself.

	 */

	for (slot = 0; slot < nritems; slot++) {

		u32 item_end_expected;

		int ret;



		btrfs_item_key_to_cpu(leaf, &key, slot);



		/* Make sure the keys are in the right order */

		if (btrfs_comp_cpu_keys(&prev_key, &key) >= 0) {

			CORRUPT("bad key order", leaf, root, slot);

			return -EUCLEAN;

		}



		/*

		 * Make sure the offset and ends are right, remember that the

		 * item data starts at the end of the leaf and grows towards the

		 * front.

		 */

		if (slot == 0)

			item_end_expected = BTRFS_LEAF_DATA_SIZE(fs_info);

		else

			item_end_expected = btrfs_item_offset_nr(leaf,

								 slot - 1);

		if (btrfs_item_end_nr(leaf, slot) != item_end_expected) {

			CORRUPT("slot offset bad", leaf, root, slot);

			return -EUCLEAN;

		}



		/*

		 * Check to make sure that we don't point outside of the leaf,

		 * just in case all the items are consistent to each other, but

		 * all point outside of the leaf.

		 */

		if (btrfs_item_end_nr(leaf, slot) >

		    BTRFS_LEAF_DATA_SIZE(fs_info)) {

			CORRUPT("slot end outside of leaf", leaf, root, slot);

			return -EUCLEAN;

		}



		/* Also check if the item pointer overlaps with btrfs item. */

		if (btrfs_item_nr_offset(slot) + sizeof(struct btrfs_item) >

		    btrfs_item_ptr_offset(leaf, slot)) {

			CORRUPT("slot overlap with its data", leaf, root, slot);

			return -EUCLEAN;

		}



		/* Check if the item size and content meet other criteria */

		ret = check_leaf_item(root, leaf, &key, slot);

		if (ret < 0)

			return ret;



		prev_key.objectid = key.objectid;

		prev_key.type = key.type;

		prev_key.offset = key.offset;

	}



	return 0;

}



int btrfs_check_node(struct btrfs_root *root, struct extent_buffer *node)

{

	unsigned long nr = btrfs_header_nritems(node);

	struct btrfs_key key, next_key;

	int slot;

	u64 bytenr;

	int ret = 0;



	if (nr == 0 || nr > BTRFS_NODEPTRS_PER_BLOCK(root->fs_info)) {

		btrfs_crit(root->fs_info,

			   "corrupt node: block %llu root %llu nritems %lu",

			   node->start, root->objectid, nr);

		return -EIO;

	}



	for (slot = 0; slot < nr - 1; slot++) {

		bytenr = btrfs_node_blockptr(node, slot);

		btrfs_node_key_to_cpu(node, &key, slot);

		btrfs_node_key_to_cpu(node, &next_key, slot + 1);



		if (!bytenr) {

			CORRUPT("invalid item slot", node, root, slot);

			ret = -EIO;

			goto out;

		}



		if (btrfs_comp_cpu_keys(&key, &next_key) >= 0) {

			CORRUPT("bad key order", node, root, slot);

			ret = -EIO;

			goto out;

		}

	}

out:

	return ret;

}

fs/btrfs/tree-checker.h

0 → 100644
+26 −0
Original line number Diff line number Diff line 
/*

 * Copyright (C) Qu Wenruo 2017.  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.

 */



#ifndef __BTRFS_TREE_CHECKER__

#define __BTRFS_TREE_CHECKER__



#include "ctree.h"

#include "extent_io.h"



int btrfs_check_leaf(struct btrfs_root *root, struct extent_buffer *leaf);

int btrfs_check_node(struct btrfs_root *root, struct extent_buffer *node);



#endif