Merge pull request #2787 from greatroar/no-blobsize-cache

Remove blob size cache from restic mount

cmd/restic/cmd_mount.go

@@ -139,7 +139,7 @@ func mount(opts MountOptions, gopts GlobalOptions, mountpoint string) error {
 		Paths:            opts.Paths,
 		SnapshotTemplate: opts.SnapshotTemplate,
 	}
-	root := fuse.NewRoot(gopts.ctx, repo, cfg)
+	root := fuse.NewRoot(repo, cfg)
 
 	Printf("Now serving the repository at %s\n", mountpoint)
 	Printf("When finished, quit with Ctrl-c or umount the mountpoint.\n")

internal/fuse/blob_size_cache.go

@@ -1,34 +0,0 @@
-// +build darwin freebsd linux
-
-package fuse
-
-import (
-	"github.com/restic/restic/internal/restic"
-	"golang.org/x/net/context"
-)
-
-// BlobSizeCache caches the size of blobs in the repo.
-type BlobSizeCache struct {
-	m map[restic.ID]uint
-}
-
-// NewBlobSizeCache returns a new blob size cache containing all entries from midx.
-func NewBlobSizeCache(ctx context.Context, idx restic.Index) *BlobSizeCache {
-	m := make(map[restic.ID]uint, 1000)
-	for pb := range idx.Each(ctx) {
-		m[pb.ID] = uint(restic.PlaintextLength(int(pb.Length)))
-	}
-	return &BlobSizeCache{
-		m: m,
-	}
-}
-
-// Lookup returns the size of the blob id.
-func (c *BlobSizeCache) Lookup(id restic.ID) (size uint, found bool) {
-	if c == nil {
-		return 0, false
-	}
-
-	size, found = c.m[id]
-	return size, found
-}

internal/fuse/dir.go

@@ -24,8 +24,6 @@ type dir struct {
 	inode       uint64
 	parentInode uint64
 	node        *restic.Node
-
-	blobsize *BlobSizeCache
 }
 
 func cleanupNodeName(name string) string {

internal/fuse/file.go

@@ -35,13 +35,9 @@ func newFile(ctx context.Context, root *Root, inode uint64, node *restic.Node) (
 	var bytes uint64
 	cumsize := make([]uint64, 1+len(node.Content))
 	for i, id := range node.Content {
-		size, ok := root.blobSizeCache.Lookup(id)
-		if !ok {
-			var found bool
-			size, found = root.repo.LookupBlobSize(id, restic.DataBlob)
-			if !found {
-				return nil, errors.Errorf("id %v not found in repository", id)
-			}
+		size, found := root.repo.LookupBlobSize(id, restic.DataBlob)
+		if !found {
+			return nil, errors.Errorf("id %v not found in repository", id)
 		}
 
 		bytes += uint64(size)

internal/fuse/fuse_test.go

@@ -156,9 +156,7 @@ func TestFuseFile(t *testing.T) {
 		Size:    filesize,
 		Content: content,
 	}
-	root := NewRoot(context.TODO(), repo, Config{})
-
-	t.Logf("blob cache has %d entries", len(root.blobSizeCache.m))
+	root := NewRoot(repo, Config{})
 
 	inode := fs.GenerateDynamicInode(1, "foo")
 	f, err := newFile(context.TODO(), root, inode, node)
@@ -202,7 +200,7 @@ func testTopUidGid(t *testing.T, cfg Config, repo restic.Repository, uid, gid ui
 	t.Helper()
 
 	ctx := context.Background()
-	root := NewRoot(ctx, repo, cfg)
+	root := NewRoot(repo, cfg)
 
 	var attr fuse.Attr
 	err := root.Attr(ctx, &attr)

internal/fuse/root.go

@@ -9,8 +9,6 @@ import (
 	"github.com/restic/restic/internal/debug"
 	"github.com/restic/restic/internal/restic"
 
-	"golang.org/x/net/context"
-
 	"bazil.org/fuse/fs"
 )
 
@@ -25,12 +23,11 @@ type Config struct {
 
 // Root is the root node of the fuse mount of a repository.
 type Root struct {
-	repo          restic.Repository
-	cfg           Config
-	inode         uint64
-	snapshots     restic.Snapshots
-	blobCache     *blobCache
-	blobSizeCache *BlobSizeCache
+	repo      restic.Repository
+	cfg       Config
+	inode     uint64
+	snapshots restic.Snapshots
+	blobCache *blobCache
 
 	snCount   int
 	lastCheck time.Time
@@ -50,15 +47,14 @@ const rootInode = 1
 const blobCacheSize = 64 << 20
 
 // NewRoot initializes a new root node from a repository.
-func NewRoot(ctx context.Context, repo restic.Repository, cfg Config) *Root {
+func NewRoot(repo restic.Repository, cfg Config) *Root {
 	debug.Log("NewRoot(), config %v", cfg)
 
 	root := &Root{
-		repo:          repo,
-		inode:         rootInode,
-		cfg:           cfg,
-		blobCache:     newBlobCache(blobCacheSize),
-		blobSizeCache: NewBlobSizeCache(ctx, repo.Index()),
+		repo:      repo,
+		inode:     rootInode,
+		cfg:       cfg,
+		blobCache: newBlobCache(blobCacheSize),
 	}
 
 	if !cfg.OwnerIsRoot {