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// Copyright (C) 2022-2023 Luke Shumaker <lukeshu@lukeshu.com>
//
// SPDX-License-Identifier: GPL-2.0-or-later
package btrfs
import (
"context"
"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/btrfsitem"
"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/btrfsprim"
"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/btrfstree"
)
// This file is ordered from low-level to high-level.
// btrfstree.NodeSource ////////////////////////////////////////////////////////
// ReadNode implements btrfstree.NodeSource.
func (fs *FS) ReadNode(path btrfstree.TreePath) (*btrfstree.Node, error) {
return btrfstree.FSReadNode(fs, path)
}
var _ btrfstree.NodeSource = (*FS)(nil)
// btrfstree.NodeFile //////////////////////////////////////////////////////////
func (fs *FS) populateTreeUUIDs(ctx context.Context) {
if fs.cacheObjID2UUID != nil && fs.cacheUUID2ObjID != nil && fs.cacheTreeParent != nil {
return
}
fs.cacheObjID2UUID = make(map[btrfsprim.ObjID]btrfsprim.UUID)
fs.cacheUUID2ObjID = make(map[btrfsprim.UUID]btrfsprim.ObjID)
fs.cacheTreeParent = make(map[btrfsprim.ObjID]btrfsprim.UUID)
fs.TreeWalk(ctx, btrfsprim.ROOT_TREE_OBJECTID,
func(err *btrfstree.TreeError) {
// do nothing
},
btrfstree.TreeWalkHandler{
Item: func(_ btrfstree.TreePath, item btrfstree.Item) error {
itemBody, ok := item.Body.(*btrfsitem.Root)
if !ok {
return nil
}
fs.cacheObjID2UUID[item.Key.ObjectID] = itemBody.UUID
fs.cacheTreeParent[item.Key.ObjectID] = itemBody.ParentUUID
fs.cacheUUID2ObjID[itemBody.UUID] = item.Key.ObjectID
return nil
},
},
)
}
// ParentTree implements btrfstree.NodeFile.
func (fs *FS) ParentTree(tree btrfsprim.ObjID) (btrfsprim.ObjID, bool) {
if tree < btrfsprim.FIRST_FREE_OBJECTID || tree > btrfsprim.LAST_FREE_OBJECTID {
// no parent
return 0, true
}
fs.populateTreeUUIDs(context.TODO())
parentUUID, ok := fs.cacheTreeParent[tree]
if !ok {
// could not look up parent info
return 0, false
}
if parentUUID == (btrfsprim.UUID{}) {
// no parent
return 0, true
}
parentObjID, ok := fs.cacheUUID2ObjID[parentUUID]
if !ok {
// could not look up parent info
return 0, false
}
return parentObjID, true
}
var _ btrfstree.NodeFile = (*FS)(nil)
// btrfstree.TreeOperator //////////////////////////////////////////////////////
// TreeWalk implements btrfstree.TreeOperator.
func (fs *FS) TreeWalk(ctx context.Context, treeID btrfsprim.ObjID, errHandle func(*btrfstree.TreeError), cbs btrfstree.TreeWalkHandler) {
btrfstree.TreeOperatorImpl{NodeSource: fs}.TreeWalk(ctx, treeID, errHandle, cbs)
}
// TreeLookup implements btrfstree.TreeOperator.
func (fs *FS) TreeLookup(treeID btrfsprim.ObjID, key btrfsprim.Key) (btrfstree.Item, error) {
return btrfstree.TreeOperatorImpl{NodeSource: fs}.TreeLookup(treeID, key)
}
// TreeSearch implements btrfstree.TreeOperator.
func (fs *FS) TreeSearch(treeID btrfsprim.ObjID, searcher btrfstree.TreeSearcher) (btrfstree.Item, error) {
return btrfstree.TreeOperatorImpl{NodeSource: fs}.TreeSearch(treeID, searcher)
}
// TreeSearchAll implements btrfstree.TreeOperator.
func (fs *FS) TreeSearchAll(treeID btrfsprim.ObjID, searcher btrfstree.TreeSearcher) ([]btrfstree.Item, error) {
return btrfstree.TreeOperatorImpl{NodeSource: fs}.TreeSearchAll(treeID, searcher)
}
var _ btrfstree.TreeOperator = (*FS)(nil)
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