17 #include "root-tree.h"
21  * Read a root item from the tree. In case we detect a root item smaller then
22  * sizeof(root_item), we know it's an old version of the root structure and
24  * generation numbers as then we know the root was once mounted with an older
25  * kernel that was not aware of the root item structure change.
42 …"mismatching generation and generation_v2 found in root item. This root was probably mounted with …  in btrfs_read_root_item()
54  * btrfs_find_root - 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()
122 		      *root, struct btrfs_key *key, struct btrfs_root_item  in btrfs_update_root()
125 	struct btrfs_fs_info *fs_info = root->fs_info;  in btrfs_update_root()
137 	ret = btrfs_search_slot(trans, root, key, path, 0, 1);  in btrfs_update_root()
143 			"unable to find root key (%llu %u %llu) in tree %llu",  in btrfs_update_root()
145 			root->root_key.objectid);  in btrfs_update_root()
157 	 * If this is the first time we update the root item which originated  in btrfs_update_root()
163 		ret = btrfs_search_slot(trans, root, key, path,  in btrfs_update_root()
170 		ret = btrfs_del_item(trans, root, path);  in btrfs_update_root()
176 		ret = btrfs_insert_empty_item(trans, root, path,  in btrfs_update_root()
188 	 * Update generation_v2 so at the next mount we know the new root  in btrfs_update_root()
200 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,  in btrfs_insert_root()  argument
207 	return btrfs_insert_item(trans, root, key, item, sizeof(*item));  in btrfs_insert_root()
216 	struct btrfs_root *root;  in btrfs_find_orphan_roots()  local
257 		root = btrfs_get_fs_root(fs_info, root_objectid, false);  in btrfs_find_orphan_roots()
258 		err = PTR_ERR_OR_ZERO(root);  in btrfs_find_orphan_roots()
278 					    "Failed to delete root orphan item");  in btrfs_find_orphan_roots()
284 		WARN_ON(!test_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED, &root->state));  in btrfs_find_orphan_roots()
285 		if (btrfs_root_refs(&root->root_item) == 0) {  in btrfs_find_orphan_roots()
288 			btrfs_disk_key_to_cpu(&drop_key, &root->root_item.drop_progress);  in btrfs_find_orphan_roots()
298 				set_bit(BTRFS_ROOT_UNFINISHED_DROP, &root->state);  in btrfs_find_orphan_roots()
301 			set_bit(BTRFS_ROOT_DEAD_TREE, &root->state);  in btrfs_find_orphan_roots()
302 			btrfs_add_dead_root(root);  in btrfs_find_orphan_roots()
304 		btrfs_put_root(root);  in btrfs_find_orphan_roots()
311 /* drop the root item for 'key' from the tree root */
315 	struct btrfs_root *root = trans->fs_info->tree_root;  in btrfs_del_root()  local
322 	ret = btrfs_search_slot(trans, root, key, path, -1, 1);  in btrfs_del_root()
328 	ret = btrfs_del_item(trans, root, path);  in btrfs_del_root()
396  * that is referencing the root.
399  * the root and ref_id is the id of the subvol  or snapshot.
474 			     struct btrfs_root *root)  in btrfs_update_root_times()  argument
476 	struct btrfs_root_item *item = &root->root_item;  in btrfs_update_root_times()
480 	spin_lock(&root->root_item_lock);  in btrfs_update_root_times()
484 	spin_unlock(&root->root_item_lock);  in btrfs_update_root_times()
489  * root: the root of the parent directory
497  * and root tree, the number of items that the qgroup reserves is
501 int btrfs_subvolume_reserve_metadata(struct btrfs_root *root,  in btrfs_subvolume_reserve_metadata()  argument
508 	struct btrfs_fs_info *fs_info = root->fs_info;  in btrfs_subvolume_reserve_metadata()
514 		ret = btrfs_qgroup_reserve_meta_prealloc(root,  in btrfs_subvolume_reserve_metadata()
531 		btrfs_qgroup_free_meta_prealloc(root, qgroup_num_bytes);  in btrfs_subvolume_reserve_metadata()
541 void btrfs_subvolume_release_metadata(struct btrfs_root *root,  in btrfs_subvolume_release_metadata()  argument
544 	struct btrfs_fs_info *fs_info = root->fs_info;  in btrfs_subvolume_release_metadata()
548 	btrfs_qgroup_convert_reserved_meta(root, qgroup_to_release);  in btrfs_subvolume_release_metadata()