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stats: fix hardlink tracking in a snapshot

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inodes are only unique within a device. Use the HardlinkIndex from the
restorer instead of the custom (broken) hashmap to correctly account for
both inode and deviceID.
This commit is contained in:
Michael Eischer 2023-10-01 23:27:09 +02:00
parent a8fdcf79b7
commit 731b3a4357
2 changed files with 13 additions and 5 deletions
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7
changelog/unreleased/pull-4503 Normal file
View file

@ -0,0 +1,7 @@
Bugfix: Correct hardlink handling in `stats` command
If files on different devices had the same inode id, then the `stats` command
did not correctly calculate the snapshot size. This has been fixed.
https://github.com/restic/restic/pull/4503
https://forum.restic.net/t/possible-bug-in-stats/6461/8

11
cmd/restic/cmd_stats.go
View file

@ -11,6 +11,7 @@ import (
"github.com/restic/restic/internal/crypto"
"github.com/restic/restic/internal/repository"
"github.com/restic/restic/internal/restic"
"github.com/restic/restic/internal/restorer"
"github.com/restic/restic/internal/ui"
"github.com/restic/restic/internal/ui/table"
"github.com/restic/restic/internal/walker"
@ -201,8 +202,8 @@ func statsWalkSnapshot(ctx context.Context, snapshot *restic.Snapshot, repo rest
return restic.FindUsedBlobs(ctx, repo, restic.IDs{*snapshot.Tree}, stats.blobs, nil)
}
uniqueInodes := make(map[uint64]struct{})
err := walker.Walk(ctx, repo, *snapshot.Tree, restic.NewIDSet(), statsWalkTree(repo, opts, stats, uniqueInodes))
hardLinkIndex := restorer.NewHardlinkIndex[struct{}]()
err := walker.Walk(ctx, repo, *snapshot.Tree, restic.NewIDSet(), statsWalkTree(repo, opts, stats, hardLinkIndex))
if err != nil {
return fmt.Errorf("walking tree %s: %v", *snapshot.Tree, err)
}
@ -210,7 +211,7 @@ func statsWalkSnapshot(ctx context.Context, snapshot *restic.Snapshot, repo rest
return nil
}
func statsWalkTree(repo restic.Repository, opts StatsOptions, stats *statsContainer, uniqueInodes map[uint64]struct{}) walker.WalkFunc {
func statsWalkTree(repo restic.Repository, opts StatsOptions, stats *statsContainer, hardLinkIndex *restorer.HardlinkIndex[struct{}]) walker.WalkFunc {
return func(parentTreeID restic.ID, npath string, node *restic.Node, nodeErr error) (bool, error) {
if nodeErr != nil {
return true, nodeErr
@ -269,8 +270,8 @@ func statsWalkTree(repo restic.Repository, opts StatsOptions, stats *statsContai
// if inodes are present, only count each inode once
// (hard links do not increase restore size)
if _, ok := uniqueInodes[node.Inode]; !ok || node.Inode == 0 {
uniqueInodes[node.Inode] = struct{}{}
if !hardLinkIndex.Has(node.Inode, node.DeviceID) || node.Inode == 0 {
hardLinkIndex.Add(node.Inode, node.DeviceID, struct{}{})
stats.TotalSize += node.Size
}