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Commit 20897f5c authored by Arne Jansen's avatar Arne Jansen Committed by Jan Schmidt
Browse files

Btrfs: added helper to create new trees 



This creates a brand new tree. Will be used to create
the quota tree.

Signed-off-by: default avatarArne Jansen <sensille@gmx.net>
parent d13603ef

fs/btrfs/disk-io.c

+77 −1
Original line number Diff line number Diff line
@@ -1225,6 +1225,82 @@ static struct btrfs_root *btrfs_alloc_root(struct btrfs_fs_info *fs_info) 
	return root;

}



struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,

				     struct btrfs_fs_info *fs_info,

				     u64 objectid)

{

	struct extent_buffer *leaf;

	struct btrfs_root *tree_root = fs_info->tree_root;

	struct btrfs_root *root;

	struct btrfs_key key;

	int ret = 0;

	u64 bytenr;



	root = btrfs_alloc_root(fs_info);

	if (!root)

		return ERR_PTR(-ENOMEM);



	__setup_root(tree_root->nodesize, tree_root->leafsize,

		     tree_root->sectorsize, tree_root->stripesize,

		     root, fs_info, objectid);

	root->root_key.objectid = objectid;

	root->root_key.type = BTRFS_ROOT_ITEM_KEY;

	root->root_key.offset = 0;



	leaf = btrfs_alloc_free_block(trans, root, root->leafsize,

				      0, objectid, NULL, 0, 0, 0);

	if (IS_ERR(leaf)) {

		ret = PTR_ERR(leaf);

		goto fail;

	}



	bytenr = leaf->start;

	memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header));

	btrfs_set_header_bytenr(leaf, leaf->start);

	btrfs_set_header_generation(leaf, trans->transid);

	btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV);

	btrfs_set_header_owner(leaf, objectid);

	root->node = leaf;



	write_extent_buffer(leaf, fs_info->fsid,

			    (unsigned long)btrfs_header_fsid(leaf),

			    BTRFS_FSID_SIZE);

	write_extent_buffer(leaf, fs_info->chunk_tree_uuid,

			    (unsigned long)btrfs_header_chunk_tree_uuid(leaf),

			    BTRFS_UUID_SIZE);

	btrfs_mark_buffer_dirty(leaf);



	root->commit_root = btrfs_root_node(root);

	root->track_dirty = 1;





	root->root_item.flags = 0;

	root->root_item.byte_limit = 0;

	btrfs_set_root_bytenr(&root->root_item, leaf->start);

	btrfs_set_root_generation(&root->root_item, trans->transid);

	btrfs_set_root_level(&root->root_item, 0);

	btrfs_set_root_refs(&root->root_item, 1);

	btrfs_set_root_used(&root->root_item, leaf->len);

	btrfs_set_root_last_snapshot(&root->root_item, 0);

	btrfs_set_root_dirid(&root->root_item, 0);

	root->root_item.drop_level = 0;



	key.objectid = objectid;

	key.type = BTRFS_ROOT_ITEM_KEY;

	key.offset = 0;

	ret = btrfs_insert_root(trans, tree_root, &key, &root->root_item);

	if (ret)

		goto fail;



	btrfs_tree_unlock(leaf);



fail:

	if (ret)

		return ERR_PTR(ret);



	return root;

}



static struct btrfs_root *alloc_log_tree(struct btrfs_trans_handle *trans,

					 struct btrfs_fs_info *fs_info)

{
@@ -3260,7 +3336,7 @@ int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid) 
	return btree_read_extent_buffer_pages(root, buf, 0, parent_transid);

}



static int btree_lock_page_hook(struct page *page, void *data,

int btree_lock_page_hook(struct page *page, void *data,

				void (*flush_fn)(void *))

{

	struct inode *inode = page->mapping->host;

fs/btrfs/disk-io.h

+6 −0
Original line number Diff line number Diff line
@@ -89,6 +89,12 @@ int btrfs_add_log_tree(struct btrfs_trans_handle *trans, 
int btrfs_cleanup_transaction(struct btrfs_root *root);

void btrfs_cleanup_one_transaction(struct btrfs_transaction *trans,

				  struct btrfs_root *root);

void btrfs_abort_devices(struct btrfs_root *root);

struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,

				     struct btrfs_fs_info *fs_info,

				     u64 objectid);

int btree_lock_page_hook(struct page *page, void *data,

				void (*flush_fn)(void *));



#ifdef CONFIG_DEBUG_LOCK_ALLOC

void btrfs_init_lockdep(void);