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// Copyright (C) 2022-2023 Luke Shumaker <lukeshu@lukeshu.com>
//
// SPDX-License-Identifier: GPL-2.0-or-later
package rebuildnodes
import (
"context"
"fmt"
"github.com/datawire/dlib/dlog"
"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/btrfsitem"
"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/btrfsprim"
)
func (o *rebuilder) cbAddedItem(ctx context.Context, tree btrfsprim.ObjID, key btrfsprim.Key) {
if handleWouldBeNoOp(key.ItemType) {
return
}
o.itemQueue.Insert(keyAndTree{
TreeID: tree,
Key: key,
})
}
func (o *rebuilder) cbLookupRoot(ctx context.Context, tree btrfsprim.ObjID) (offset btrfsprim.Generation, item btrfsitem.Root, ok bool) {
ctx = dlog.WithField(ctx, "btrfsinspect.rebuild-nodes.rebuild.add-tree.want.reason", "tree Root")
key := keyAndTree{
TreeID: btrfsprim.ROOT_TREE_OBJECTID,
Key: btrfsprim.Key{
ObjectID: tree,
ItemType: btrfsitem.ROOT_ITEM_KEY,
},
}
wantKey := fmt.Sprintf("tree=%v key={%v %v ?}", key.TreeID, key.ObjectID, key.ItemType)
ctx = dlog.WithField(ctx, "btrfsinspect.rebuild-nodes.rebuild.add-tree.want.key", wantKey)
key.Key, ok = o._want(ctx, key.TreeID, wantKey, key.ObjectID, key.ItemType)
if !ok {
o.enqueueRetry()
return 0, btrfsitem.Root{}, false
}
switch itemBody := o.rebuilt.Tree(ctx, key.TreeID).ReadItem(ctx, key.Key).(type) {
case *btrfsitem.Root:
return btrfsprim.Generation(key.Offset), *itemBody, true
case *btrfsitem.Error:
o.fsErr(ctx, fmt.Errorf("error decoding item: %v: %w", key, itemBody.Err))
return 0, btrfsitem.Root{}, false
default:
// This is a panic because the item decoder should not emit ROOT_ITEM items as anything but
// btrfsitem.Root or btrfsitem.Error without this code also being updated.
panic(fmt.Errorf("should not happen: ROOT_ITEM item has unexpected type: %T", itemBody))
}
}
func (o *rebuilder) cbLookupUUID(ctx context.Context, uuid btrfsprim.UUID) (id btrfsprim.ObjID, ok bool) {
ctx = dlog.WithField(ctx, "btrfsinspect.rebuild-nodes.rebuild.add-tree.want.reason", "resolve parent UUID")
key := keyAndTree{TreeID: btrfsprim.UUID_TREE_OBJECTID, Key: btrfsitem.UUIDToKey(uuid)}
ctx = dlog.WithField(ctx, "btrfsinspect.rebuild-nodes.rebuild.add-tree.want.key", key.String())
if !o._wantOff(ctx, key.TreeID, key.String(), key.Key) {
o.enqueueRetry()
return 0, false
}
switch itemBody := o.rebuilt.Tree(ctx, key.TreeID).ReadItem(ctx, key.Key).(type) {
case *btrfsitem.UUIDMap:
return itemBody.ObjID, true
case *btrfsitem.Error:
o.fsErr(ctx, fmt.Errorf("error decoding item: %v: %w", key, itemBody.Err))
return 0, false
default:
// This is a panic because the item decoder should not emit UUID_SUBVOL items as anything but
// btrfsitem.UUIDMap or btrfsitem.Error without this code also being updated.
panic(fmt.Errorf("should not happen: UUID_SUBVOL item has unexpected type: %T", itemBody))
}
}
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