16 #include "root-tree.h"
20  * Read a root item from the tree. In case we detect a root item smaller then
21  * sizeof(root_item), we know it's an old version of the root structure and
23  * generation numbers as then we know the root was once mounted with an older
24  * kernel that was not aware of the root item structure change.
41 …"mismatching generation and generation_v2 found in root item. This root was probably mounted with …  in btrfs_read_root_item()
53  * Lookup the root by the key.
55  * root: the root of the root tree
58  * root_item: the root item of the tree we look for
59  * root_key: the root key of the tree we look for
62  * of the search key, just lookup the root with the highest offset for a
67 int btrfs_find_root(struct btrfs_root *root, const struct btrfs_key *search_key,  in btrfs_find_root()  argument
76 	ret = btrfs_search_slot(NULL, root, search_key, path, 0, 0);  in btrfs_find_root()
85 		 * Key with offset -1 found, there would have to exist a root  in btrfs_find_root()
129 		      *root, struct btrfs_key *key, struct btrfs_root_item  in btrfs_update_root()
132 	struct btrfs_fs_info *fs_info = root->fs_info;  in btrfs_update_root()
144 	ret = btrfs_search_slot(trans, root, key, path, 0, 1);  in btrfs_update_root()
150 			"unable to find root key (%llu %u %llu) in tree %llu",  in btrfs_update_root()
151 			key->objectid, key->type, key->offset, btrfs_root_id(root));  in btrfs_update_root()
163 	 * If this is the first time we update the root item which originated  in btrfs_update_root()
169 		ret = btrfs_search_slot(trans, root, key, path,  in btrfs_update_root()
176 		ret = btrfs_del_item(trans, root, path);  in btrfs_update_root()
182 		ret = btrfs_insert_empty_item(trans, root, path,  in btrfs_update_root()
194 	 * Update generation_v2 so at the next mount we know the new root  in btrfs_update_root()
205 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,  in btrfs_insert_root()  argument
212 	return btrfs_insert_item(trans, root, key, item, sizeof(*item));  in btrfs_insert_root()
221 	struct btrfs_root *root;  in btrfs_find_orphan_roots()  local
262 		root = btrfs_get_fs_root(fs_info, root_objectid, false);  in btrfs_find_orphan_roots()
263 		err = PTR_ERR_OR_ZERO(root);  in btrfs_find_orphan_roots()
283 					    "Failed to delete root orphan item");  in btrfs_find_orphan_roots()
289 		WARN_ON(!test_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED, &root->state));  in btrfs_find_orphan_roots()
290 		if (btrfs_root_refs(&root->root_item) == 0) {  in btrfs_find_orphan_roots()
293 			btrfs_disk_key_to_cpu(&drop_key, &root->root_item.drop_progress);  in btrfs_find_orphan_roots()
303 				set_bit(BTRFS_ROOT_UNFINISHED_DROP, &root->state);  in btrfs_find_orphan_roots()
306 			set_bit(BTRFS_ROOT_DEAD_TREE, &root->state);  in btrfs_find_orphan_roots()
307 			btrfs_add_dead_root(root);  in btrfs_find_orphan_roots()
309 		btrfs_put_root(root);  in btrfs_find_orphan_roots()
316 /* drop the root item for 'key' from the tree root */
320 	struct btrfs_root *root = trans->fs_info->tree_root;  in btrfs_del_root()  local
327 	ret = btrfs_search_slot(trans, root, key, path, -1, 1);  in btrfs_del_root()
331 		/* The root must exist but we did not find it by the key. */  in btrfs_del_root()
336 	ret = btrfs_del_item(trans, root, path);  in btrfs_del_root()
404  * that is referencing the root.
407  * the root and ref_id is the id of the subvol  or snapshot.
481 			     struct btrfs_root *root)  in btrfs_update_root_times()  argument
483 	struct btrfs_root_item *item = &root->root_item;  in btrfs_update_root_times()
487 	spin_lock(&root->root_item_lock);  in btrfs_update_root_times()
491 	spin_unlock(&root->root_item_lock);  in btrfs_update_root_times()
497  * root: the root of the parent directory
505  * and root tree, the number of items that the qgroup reserves is
509 int btrfs_subvolume_reserve_metadata(struct btrfs_root *root,  in btrfs_subvolume_reserve_metadata()  argument
516 	struct btrfs_fs_info *fs_info = root->fs_info;  in btrfs_subvolume_reserve_metadata()
522 		ret = btrfs_qgroup_reserve_meta_prealloc(root,  in btrfs_subvolume_reserve_metadata()
539 		btrfs_qgroup_free_meta_prealloc(root, qgroup_num_bytes);  in btrfs_subvolume_reserve_metadata()