utils.c - pub/scm/linux/kernel/git/mason/btrfs-progs - Git at Google

 /*
  * 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.
  */

 #define _XOPEN_SOURCE 600
 #define __USE_XOPEN2K
 #include <stdio.h>
 #include <stdlib.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <uuid/uuid.h>
 #include <fcntl.h>
 #include <unistd.h>
 #include "kerncompat.h"
 #include "radix-tree.h"
 #include "ctree.h"
 #include "disk-io.h"
 #include "transaction.h"
 #include "crc32c.h"
 #include "utils.h"
 static u64 reference_root_table[4] = {
 	[1] =	BTRFS_ROOT_TREE_OBJECTID,
 	[2] =	BTRFS_EXTENT_TREE_OBJECTID,
 	[3] =	BTRFS_FS_TREE_OBJECTID,
 };

 int make_btrfs(int fd, u64 blocks[4], u64 num_bytes, u32 nodesize,
 	       u32 leafsize, u32 sectorsize, u32 stripesize)
 {
 	struct btrfs_super_block super;
 	struct extent_buffer *buf;
 	struct btrfs_root_item root_item;
 	struct btrfs_disk_key disk_key;
 	struct btrfs_extent_ref *extent_ref;
 	struct btrfs_extent_item *extent_item;
 	struct btrfs_inode_item *inode_item;
 	int i;
 	int ret;
 	u32 itemoff;
 	u32 nritems = 0;
 	u64 hash;
 	u64 first_free;
 	u64 ref_gen;
 	u64 ref_root;

 	first_free = BTRFS_SUPER_INFO_OFFSET + sectorsize * 2 - 1;
 	first_free &= ~((u64)sectorsize - 1);

 	num_bytes = (num_bytes / sectorsize) * sectorsize;
 	uuid_generate(super.fsid);
 	btrfs_set_super_bytenr(&super, blocks[0]);
 	strcpy((char *)(&super.magic), BTRFS_MAGIC);
 	btrfs_set_super_generation(&super, 1);
 	btrfs_set_super_root(&super, blocks[1]);
 	btrfs_set_super_total_bytes(&super, num_bytes);
 	btrfs_set_super_bytes_used(&super, first_free + 3 * leafsize);
 	btrfs_set_super_root_dir(&super, 0);
 	btrfs_set_super_sectorsize(&super, sectorsize);
 	btrfs_set_super_leafsize(&super, leafsize);
 	btrfs_set_super_nodesize(&super, nodesize);
 	btrfs_set_super_stripesize(&super, stripesize);
 	btrfs_set_super_root_level(&super, 0);

 	buf = malloc(sizeof(*buf) + max(sectorsize, leafsize));

 	BUG_ON(sizeof(super) > sectorsize);
 	memset(buf->data, 0, sectorsize);
 	memcpy(buf->data, &super, sizeof(super));
 	ret = pwrite(fd, buf->data, sectorsize, blocks[0]);
 	BUG_ON(ret != sectorsize);

 	/* create the tree of root objects */
 	memset(buf->data, 0, leafsize);
 	btrfs_set_header_bytenr(buf, blocks[1]);
 	btrfs_set_header_nritems(buf, 2);
 	btrfs_set_header_generation(buf, 1);
 	btrfs_set_header_owner(buf, BTRFS_ROOT_TREE_OBJECTID);
 	write_extent_buffer(buf, super.fsid, (unsigned long)
 			    btrfs_header_fsid(buf), BTRFS_FSID_SIZE);

 	/* create the items for the root tree */
 	memset(&root_item, 0, sizeof(root_item));
 	inode_item = &root_item.inode;
 	btrfs_set_stack_inode_generation(inode_item, 1);
 	btrfs_set_stack_inode_size(inode_item, 3);
 	btrfs_set_stack_inode_nlink(inode_item, 1);
 	btrfs_set_stack_inode_nblocks(inode_item, 1);
 	btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755);
 	btrfs_set_root_refs(&root_item, 1);
 	btrfs_set_root_used(&root_item, leafsize);

 	memset(&disk_key, 0, sizeof(disk_key));
 	btrfs_set_disk_key_type(&disk_key, BTRFS_ROOT_ITEM_KEY);
 	btrfs_set_disk_key_offset(&disk_key, 0);

 	itemoff = __BTRFS_LEAF_DATA_SIZE(leafsize) - sizeof(root_item);
 	btrfs_set_root_bytenr(&root_item, blocks[2]);
 	btrfs_set_disk_key_objectid(&disk_key, BTRFS_EXTENT_TREE_OBJECTID);
 	btrfs_set_item_key(buf, &disk_key, 0);
 	btrfs_set_item_offset(buf, btrfs_item_nr(buf, 0), itemoff);
 	btrfs_set_item_size(buf, btrfs_item_nr(buf, 0), sizeof(root_item));
 	write_extent_buffer(buf, &root_item, btrfs_item_ptr_offset(buf, 0),
 			    sizeof(root_item));

 	itemoff = itemoff - sizeof(root_item);
 	btrfs_set_root_bytenr(&root_item, blocks[3]);
 	btrfs_set_disk_key_objectid(&disk_key, BTRFS_FS_TREE_OBJECTID);
 	btrfs_set_item_key(buf, &disk_key, 1);
 	btrfs_set_item_offset(buf, btrfs_item_nr(buf, 1), itemoff);
 	btrfs_set_item_size(buf, btrfs_item_nr(buf, 1), sizeof(root_item));
 	write_extent_buffer(buf, &root_item, btrfs_item_ptr_offset(buf, 1),
 			    sizeof(root_item));
 	ret = pwrite(fd, buf->data, leafsize, blocks[1]);
 	BUG_ON(ret != leafsize);

 	/* create the items for the extent tree */
 	itemoff = __BTRFS_LEAF_DATA_SIZE(leafsize) -
 		  sizeof(struct btrfs_extent_item);
 	btrfs_set_disk_key_objectid(&disk_key, 0);
 	btrfs_set_disk_key_offset(&disk_key, first_free);
 	btrfs_set_disk_key_type(&disk_key, BTRFS_EXTENT_ITEM_KEY);
 	btrfs_set_item_key(buf, &disk_key, nritems);
 	btrfs_set_item_offset(buf, btrfs_item_nr(buf, nritems), itemoff);
 	btrfs_set_item_size(buf, btrfs_item_nr(buf,  nritems),
 			    sizeof(struct btrfs_extent_item));
 	extent_item = btrfs_item_ptr(buf, nritems, struct btrfs_extent_item);
 	btrfs_set_extent_refs(buf, extent_item, 1);
 	nritems++;
 	for (i = 1; i < 4; i++) {
 		BUG_ON(blocks[i] < first_free);
 		BUG_ON(blocks[i] < blocks[i - 1]);

 		/* create extent item */
 		itemoff = itemoff - sizeof(struct btrfs_extent_item);
 		btrfs_set_disk_key_objectid(&disk_key, blocks[i]);
 		btrfs_set_disk_key_offset(&disk_key, leafsize);
 		btrfs_set_disk_key_type(&disk_key, BTRFS_EXTENT_ITEM_KEY);
 		btrfs_set_item_key(buf, &disk_key, nritems);
 		btrfs_set_item_offset(buf, btrfs_item_nr(buf, nritems),
 				      itemoff);
 		btrfs_set_item_size(buf, btrfs_item_nr(buf, nritems),
 				    sizeof(struct btrfs_extent_item));
 		extent_item = btrfs_item_ptr(buf, nritems,
 					     struct btrfs_extent_item);
 		btrfs_set_extent_refs(buf, extent_item, 1);
 		nritems++;

 		/* create extent ref */
 		ref_root = reference_root_table[i];
 		if (ref_root == BTRFS_FS_TREE_OBJECTID)
 			ref_gen = 1;
 		else
 			ref_gen = 0;

 		hash = btrfs_hash_extent_ref(ref_root, ref_gen, 0, 0);
 		itemoff = itemoff - sizeof(struct btrfs_extent_ref);
 		btrfs_set_disk_key_objectid(&disk_key, blocks[i]);
 		btrfs_set_disk_key_offset(&disk_key, hash);
 		btrfs_set_disk_key_type(&disk_key, BTRFS_EXTENT_REF_KEY);
 		btrfs_set_item_key(buf, &disk_key, nritems);
 		btrfs_set_item_offset(buf, btrfs_item_nr(buf, nritems),
 				      itemoff);
 		btrfs_set_item_size(buf, btrfs_item_nr(buf, nritems),
 				    sizeof(struct btrfs_extent_ref));
 		extent_ref = btrfs_item_ptr(buf, nritems,
 					     struct btrfs_extent_ref);
 		btrfs_set_ref_root(buf, extent_ref, ref_root);
 		btrfs_set_ref_generation(buf, extent_ref, ref_gen);
 		btrfs_set_ref_objectid(buf, extent_ref, 0);
 		btrfs_set_ref_offset(buf, extent_ref, 0);
 		nritems++;
 	}
 	btrfs_set_header_bytenr(buf, blocks[2]);
 	btrfs_set_header_owner(buf, BTRFS_EXTENT_TREE_OBJECTID);
 	btrfs_set_header_nritems(buf, nritems);
 	ret = pwrite(fd, buf->data, leafsize, blocks[2]);
 	BUG_ON(ret != leafsize);

 	/* finally create the FS root */
 	btrfs_set_header_bytenr(buf, blocks[3]);
 	btrfs_set_header_owner(buf, BTRFS_FS_TREE_OBJECTID);
 	btrfs_set_header_nritems(buf, 0);
 	ret = pwrite(fd, buf->data, leafsize, blocks[3]);
 	BUG_ON(ret != leafsize);

 	free(buf);
 	return 0;
 }

 int btrfs_make_root_dir(struct btrfs_trans_handle *trans,
 			struct btrfs_root *root, u64 objectid)
 {
 	int ret;
 	struct btrfs_inode_item inode_item;

 	memset(&inode_item, 0, sizeof(inode_item));
 	btrfs_set_stack_inode_generation(&inode_item, trans->transid);
 	btrfs_set_stack_inode_size(&inode_item, 0);
 	btrfs_set_stack_inode_nlink(&inode_item, 1);
 	btrfs_set_stack_inode_nblocks(&inode_item, 1);
 	btrfs_set_stack_inode_mode(&inode_item, S_IFDIR | 0555);

 	if (root->fs_info->tree_root == root)
 		btrfs_set_super_root_dir(&root->fs_info->super_copy, objectid);

 	ret = btrfs_insert_inode(trans, root, objectid, &inode_item);
 	if (ret)
 		goto error;

 	ret = btrfs_insert_inode_ref(trans, root, "..", 2, objectid, objectid);
 	if (ret)
 		goto error;

 	btrfs_set_root_dirid(&root->root_item, objectid);
 	ret = 0;
 error:
 	return ret;
 }
	/*
	* 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.
	*/

	#define _XOPEN_SOURCE 600
	#define __USE_XOPEN2K
	#include <stdio.h>
	#include <stdlib.h>
	#include <sys/types.h>
	#include <sys/stat.h>
	#include <uuid/uuid.h>
	#include <fcntl.h>
	#include <unistd.h>
	#include "kerncompat.h"
	#include "radix-tree.h"
	#include "ctree.h"
	#include "disk-io.h"
	#include "transaction.h"
	#include "crc32c.h"
	#include "utils.h"
	static u64 reference_root_table[4] = {
	[1] = BTRFS_ROOT_TREE_OBJECTID,
	[2] = BTRFS_EXTENT_TREE_OBJECTID,
	[3] = BTRFS_FS_TREE_OBJECTID,
	};

	int make_btrfs(int fd, u64 blocks[4], u64 num_bytes, u32 nodesize,
	u32 leafsize, u32 sectorsize, u32 stripesize)
	{
	struct btrfs_super_block super;
	struct extent_buffer *buf;
	struct btrfs_root_item root_item;
	struct btrfs_disk_key disk_key;
	struct btrfs_extent_ref *extent_ref;
	struct btrfs_extent_item *extent_item;
	struct btrfs_inode_item *inode_item;
	int i;
	int ret;
	u32 itemoff;
	u32 nritems = 0;
	u64 hash;
	u64 first_free;
	u64 ref_gen;
	u64 ref_root;

	first_free = BTRFS_SUPER_INFO_OFFSET + sectorsize * 2 - 1;
	first_free &= ~((u64)sectorsize - 1);

	num_bytes = (num_bytes / sectorsize) * sectorsize;
	uuid_generate(super.fsid);
	btrfs_set_super_bytenr(&super, blocks[0]);
	strcpy((char *)(&super.magic), BTRFS_MAGIC);
	btrfs_set_super_generation(&super, 1);
	btrfs_set_super_root(&super, blocks[1]);
	btrfs_set_super_total_bytes(&super, num_bytes);
	btrfs_set_super_bytes_used(&super, first_free + 3 * leafsize);
	btrfs_set_super_root_dir(&super, 0);
	btrfs_set_super_sectorsize(&super, sectorsize);
	btrfs_set_super_leafsize(&super, leafsize);
	btrfs_set_super_nodesize(&super, nodesize);
	btrfs_set_super_stripesize(&super, stripesize);
	btrfs_set_super_root_level(&super, 0);

	buf = malloc(sizeof(*buf) + max(sectorsize, leafsize));

	BUG_ON(sizeof(super) > sectorsize);
	memset(buf->data, 0, sectorsize);
	memcpy(buf->data, &super, sizeof(super));
	ret = pwrite(fd, buf->data, sectorsize, blocks[0]);
	BUG_ON(ret != sectorsize);

	/* create the tree of root objects */
	memset(buf->data, 0, leafsize);
	btrfs_set_header_bytenr(buf, blocks[1]);
	btrfs_set_header_nritems(buf, 2);
	btrfs_set_header_generation(buf, 1);
	btrfs_set_header_owner(buf, BTRFS_ROOT_TREE_OBJECTID);
	write_extent_buffer(buf, super.fsid, (unsigned long)
	btrfs_header_fsid(buf), BTRFS_FSID_SIZE);

	/* create the items for the root tree */
	memset(&root_item, 0, sizeof(root_item));
	inode_item = &root_item.inode;
	btrfs_set_stack_inode_generation(inode_item, 1);
	btrfs_set_stack_inode_size(inode_item, 3);
	btrfs_set_stack_inode_nlink(inode_item, 1);
	btrfs_set_stack_inode_nblocks(inode_item, 1);
	btrfs_set_stack_inode_mode(inode_item, S_IFDIR \| 0755);
	btrfs_set_root_refs(&root_item, 1);
	btrfs_set_root_used(&root_item, leafsize);

	memset(&disk_key, 0, sizeof(disk_key));
	btrfs_set_disk_key_type(&disk_key, BTRFS_ROOT_ITEM_KEY);
	btrfs_set_disk_key_offset(&disk_key, 0);

	itemoff = __BTRFS_LEAF_DATA_SIZE(leafsize) - sizeof(root_item);
	btrfs_set_root_bytenr(&root_item, blocks[2]);
	btrfs_set_disk_key_objectid(&disk_key, BTRFS_EXTENT_TREE_OBJECTID);
	btrfs_set_item_key(buf, &disk_key, 0);
	btrfs_set_item_offset(buf, btrfs_item_nr(buf, 0), itemoff);
	btrfs_set_item_size(buf, btrfs_item_nr(buf, 0), sizeof(root_item));
	write_extent_buffer(buf, &root_item, btrfs_item_ptr_offset(buf, 0),
	sizeof(root_item));

	itemoff = itemoff - sizeof(root_item);
	btrfs_set_root_bytenr(&root_item, blocks[3]);
	btrfs_set_disk_key_objectid(&disk_key, BTRFS_FS_TREE_OBJECTID);
	btrfs_set_item_key(buf, &disk_key, 1);
	btrfs_set_item_offset(buf, btrfs_item_nr(buf, 1), itemoff);
	btrfs_set_item_size(buf, btrfs_item_nr(buf, 1), sizeof(root_item));
	write_extent_buffer(buf, &root_item, btrfs_item_ptr_offset(buf, 1),
	sizeof(root_item));
	ret = pwrite(fd, buf->data, leafsize, blocks[1]);
	BUG_ON(ret != leafsize);

	/* create the items for the extent tree */
	itemoff = __BTRFS_LEAF_DATA_SIZE(leafsize) -
	sizeof(struct btrfs_extent_item);
	btrfs_set_disk_key_objectid(&disk_key, 0);
	btrfs_set_disk_key_offset(&disk_key, first_free);
	btrfs_set_disk_key_type(&disk_key, BTRFS_EXTENT_ITEM_KEY);
	btrfs_set_item_key(buf, &disk_key, nritems);
	btrfs_set_item_offset(buf, btrfs_item_nr(buf, nritems), itemoff);
	btrfs_set_item_size(buf, btrfs_item_nr(buf, nritems),
	sizeof(struct btrfs_extent_item));
	extent_item = btrfs_item_ptr(buf, nritems, struct btrfs_extent_item);
	btrfs_set_extent_refs(buf, extent_item, 1);
	nritems++;
	for (i = 1; i < 4; i++) {
	BUG_ON(blocks[i] < first_free);
	BUG_ON(blocks[i] < blocks[i - 1]);

	/* create extent item */
	itemoff = itemoff - sizeof(struct btrfs_extent_item);
	btrfs_set_disk_key_objectid(&disk_key, blocks[i]);
	btrfs_set_disk_key_offset(&disk_key, leafsize);
	btrfs_set_disk_key_type(&disk_key, BTRFS_EXTENT_ITEM_KEY);
	btrfs_set_item_key(buf, &disk_key, nritems);
	btrfs_set_item_offset(buf, btrfs_item_nr(buf, nritems),
	itemoff);
	btrfs_set_item_size(buf, btrfs_item_nr(buf, nritems),
	sizeof(struct btrfs_extent_item));
	extent_item = btrfs_item_ptr(buf, nritems,
	struct btrfs_extent_item);
	btrfs_set_extent_refs(buf, extent_item, 1);
	nritems++;

	/* create extent ref */
	ref_root = reference_root_table[i];
	if (ref_root == BTRFS_FS_TREE_OBJECTID)
	ref_gen = 1;
	else
	ref_gen = 0;

	hash = btrfs_hash_extent_ref(ref_root, ref_gen, 0, 0);
	itemoff = itemoff - sizeof(struct btrfs_extent_ref);
	btrfs_set_disk_key_objectid(&disk_key, blocks[i]);
	btrfs_set_disk_key_offset(&disk_key, hash);
	btrfs_set_disk_key_type(&disk_key, BTRFS_EXTENT_REF_KEY);
	btrfs_set_item_key(buf, &disk_key, nritems);
	btrfs_set_item_offset(buf, btrfs_item_nr(buf, nritems),
	itemoff);
	btrfs_set_item_size(buf, btrfs_item_nr(buf, nritems),
	sizeof(struct btrfs_extent_ref));
	extent_ref = btrfs_item_ptr(buf, nritems,
	struct btrfs_extent_ref);
	btrfs_set_ref_root(buf, extent_ref, ref_root);
	btrfs_set_ref_generation(buf, extent_ref, ref_gen);
	btrfs_set_ref_objectid(buf, extent_ref, 0);
	btrfs_set_ref_offset(buf, extent_ref, 0);
	nritems++;
	}
	btrfs_set_header_bytenr(buf, blocks[2]);
	btrfs_set_header_owner(buf, BTRFS_EXTENT_TREE_OBJECTID);
	btrfs_set_header_nritems(buf, nritems);
	ret = pwrite(fd, buf->data, leafsize, blocks[2]);
	BUG_ON(ret != leafsize);

	/* finally create the FS root */
	btrfs_set_header_bytenr(buf, blocks[3]);
	btrfs_set_header_owner(buf, BTRFS_FS_TREE_OBJECTID);
	btrfs_set_header_nritems(buf, 0);
	ret = pwrite(fd, buf->data, leafsize, blocks[3]);
	BUG_ON(ret != leafsize);

	free(buf);
	return 0;
	}

	int btrfs_make_root_dir(struct btrfs_trans_handle *trans,
	struct btrfs_root *root, u64 objectid)
	{
	int ret;
	struct btrfs_inode_item inode_item;

	memset(&inode_item, 0, sizeof(inode_item));
	btrfs_set_stack_inode_generation(&inode_item, trans->transid);
	btrfs_set_stack_inode_size(&inode_item, 0);
	btrfs_set_stack_inode_nlink(&inode_item, 1);
	btrfs_set_stack_inode_nblocks(&inode_item, 1);
	btrfs_set_stack_inode_mode(&inode_item, S_IFDIR \| 0555);

	if (root->fs_info->tree_root == root)
	btrfs_set_super_root_dir(&root->fs_info->super_copy, objectid);

	ret = btrfs_insert_inode(trans, root, objectid, &inode_item);
	if (ret)
	goto error;

	ret = btrfs_insert_inode_ref(trans, root, "..", 2, objectid, objectid);
	if (ret)
	goto error;

	btrfs_set_root_dirid(&root->root_item, objectid);
	ret = 0;
	error:
	return ret;
	}