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
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
|
// Copyright (C) 2022 Luke Shumaker <lukeshu@lukeshu.com>
//
// SPDX-License-Identifier: GPL-2.0-or-later
package rebuildnodes
import (
"context"
"fmt"
iofs "io/fs"
"github.com/datawire/dlib/dlog"
"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/btrfstree"
"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/btrfsvol"
"git.lukeshu.com/btrfs-progs-ng/lib/btrfsprogs/btrfsinspect"
"git.lukeshu.com/btrfs-progs-ng/lib/btrfsprogs/btrfsutil"
"git.lukeshu.com/btrfs-progs-ng/lib/diskio"
)
func reInitBrokenNodes(ctx context.Context, fs _FS, nodeScanResults btrfsinspect.ScanDevicesResult, foundRoots map[btrfsvol.LogicalAddr]struct{}) (map[btrfsvol.LogicalAddr]*RebuiltNode, error) {
dlog.Info(ctx, "Initializing nodes to re-build...")
sb, err := fs.Superblock()
if err != nil {
return nil, err
}
chunkTreeUUID, ok := getChunkTreeUUID(ctx, fs)
if !ok {
return nil, fmt.Errorf("could not look up chunk tree UUID")
}
lastPct := -1
total := countNodes(nodeScanResults)
done := 0
progress := func() {
pct := int(100 * float64(done) / float64(total))
if pct != lastPct || done == total {
dlog.Infof(ctx, "... %v%% (%v/%v)",
pct, done, total)
lastPct = pct
}
}
rebuiltNodes := make(map[btrfsvol.LogicalAddr]*RebuiltNode)
visitedNodes := make(map[btrfsvol.LogicalAddr]struct{})
walkHandler := btrfstree.TreeWalkHandler{
Node: func(path btrfstree.TreePath, _ *diskio.Ref[btrfsvol.LogicalAddr, btrfstree.Node]) error {
addr := path.Node(-1).ToNodeAddr
if _, alreadyVisited := visitedNodes[addr]; alreadyVisited {
// Can happen because of COW subvolumes;
// this is really a DAG not a tree.
return iofs.SkipDir
}
visitedNodes[addr] = struct{}{}
done++
progress()
return nil
},
BadNode: func(path btrfstree.TreePath, node *diskio.Ref[btrfsvol.LogicalAddr, btrfstree.Node], err error) error {
min, max := spanOfTreePath(fs, path)
rebuiltNodes[path.Node(-1).ToNodeAddr] = &RebuiltNode{
Err: err.Error(),
MinKey: min,
MaxKey: max,
Node: btrfstree.Node{
Size: sb.NodeSize,
ChecksumType: sb.ChecksumType,
Head: btrfstree.NodeHeader{
MetadataUUID: sb.EffectiveMetadataUUID(),
Addr: path.Node(-1).ToNodeAddr,
ChunkTreeUUID: chunkTreeUUID,
Owner: path.Node(-1).FromTree, // FIXME: handle it being a child tree?
Generation: path.Node(-1).FromGeneration,
Level: path.Node(-1).ToNodeLevel,
},
},
}
return err
},
}
// We use WalkAllTrees instead of just iterating over
// nodeScanResults so that we don't need to specifically check
// if any of the root nodes referenced directly by the
// superblock are dead.
progress()
btrfsutil.WalkAllTrees(ctx, fs, btrfsutil.WalkAllTreesHandler{
Err: func(err *btrfsutil.WalkError) {
// do nothing
},
TreeWalkHandler: walkHandler,
})
for foundRoot := range foundRoots {
walkFromNode(ctx, fs, foundRoot,
func(err *btrfstree.TreeError) {
// do nothing
},
walkHandler)
}
if done != total {
panic("should not happen")
}
dlog.Infof(ctx, "... initialized %d nodes", len(rebuiltNodes))
return rebuiltNodes, nil
}
|
