1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
|
// Copyright (C) 2022-2023 Luke Shumaker <lukeshu@lukeshu.com>
//
// SPDX-License-Identifier: GPL-2.0-or-later
package rebuildnodes
import (
"context"
"fmt"
"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) {
wantKey := WantWithTree{
TreeID: btrfsprim.ROOT_TREE_OBJECTID,
Key: Want{
ObjectID: tree,
ItemType: btrfsitem.ROOT_ITEM_KEY,
OffsetType: offsetAny,
},
}
ctx = withWant(ctx, logFieldTreeWant, "tree Root", wantKey)
foundKey, ok := o._want(ctx, wantKey)
if !ok {
o.enqueueRetry()
return 0, btrfsitem.Root{}, false
}
switch itemBody := o.rebuilt.Tree(ctx, wantKey.TreeID).ReadItem(ctx, foundKey).(type) {
case *btrfsitem.Root:
return btrfsprim.Generation(foundKey.Offset), *itemBody, true
case *btrfsitem.Error:
o.fsErr(ctx, fmt.Errorf("error decoding item: %v: %w", foundKey, 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) {
wantKey := WantWithTree{
TreeID: btrfsprim.UUID_TREE_OBJECTID,
Key: wantFromKey(btrfsitem.UUIDToKey(uuid)),
}
ctx = withWant(ctx, logFieldTreeWant, "resolve parent UUID", wantKey)
if !o._wantOff(ctx, wantKey) {
o.enqueueRetry()
return 0, false
}
switch itemBody := o.rebuilt.Tree(ctx, wantKey.TreeID).ReadItem(ctx, wantKey.Key.Key()).(type) {
case *btrfsitem.UUIDMap:
return itemBody.ObjID, true
case *btrfsitem.Error:
o.fsErr(ctx, fmt.Errorf("error decoding item: %v: %w", wantKey, 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))
}
}
|