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fuse: forget fs.Node instances on request by the kernel

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Forget fs.Node instances once the kernel frees the corresponding nodeId.
This ensures that restic does not run out of memory on large snapshots.
This commit is contained in:
Michael Eischer 2024-09-09 22:37:51 +02:00
parent de4f8b344e
commit 0e9716a6e6
8 changed files with 86 additions and 39 deletions
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24
internal/fuse/dir.go
View file

@ -20,12 +20,14 @@ import (
// Statically ensure that *dir implement those interface
var _ = fs.HandleReadDirAller(&dir{})
var _ = fs.NodeForgetter(&dir{})
var _ = fs.NodeGetxattrer(&dir{})
var _ = fs.NodeListxattrer(&dir{})
var _ = fs.NodeStringLookuper(&dir{})
type dir struct {
root *Root
forget forgetFn
items map[string]*restic.Node
inode uint64
parentInode uint64
@ -38,11 +40,12 @@ func cleanupNodeName(name string) string {
return filepath.Base(name)
}
func newDir(root *Root, inode, parentInode uint64, node *restic.Node) (*dir, error) {
func newDir(root *Root, forget forgetFn, inode, parentInode uint64, node *restic.Node) (*dir, error) {
debug.Log("new dir for %v (%v)", node.Name, node.Subtree)
return &dir{
root: root,
forget: forget,
node: node,
inode: inode,
parentInode: parentInode,
@ -79,10 +82,11 @@ func replaceSpecialNodes(ctx context.Context, repo restic.BlobLoader, node *rest
return tree.Nodes, nil
}
func newDirFromSnapshot(root *Root, inode uint64, snapshot *restic.Snapshot) (*dir, error) {
func newDirFromSnapshot(root *Root, forget forgetFn, inode uint64, snapshot *restic.Snapshot) (*dir, error) {
debug.Log("new dir for snapshot %v (%v)", snapshot.ID(), snapshot.Tree)
return &dir{
root: root,
root: root,
forget: forget,
node: &restic.Node{
AccessTime: snapshot.Time,
ModTime: snapshot.Time,
@ -213,7 +217,7 @@ func (d *dir) Lookup(ctx context.Context, name string) (fs.Node, error) {
return nil, err
}
return d.cache.lookupOrCreate(name, func() (fs.Node, error) {
return d.cache.lookupOrCreate(name, func(forget forgetFn) (fs.Node, error) {
node, ok := d.items[name]
if !ok {
debug.Log(" Lookup(%v) -> not found", name)
@ -222,13 +226,13 @@ func (d *dir) Lookup(ctx context.Context, name string) (fs.Node, error) {
inode := inodeFromNode(d.inode, node)
switch node.Type {
case "dir":
return newDir(d.root, inode, d.inode, node)
return newDir(d.root, forget, inode, d.inode, node)
case "file":
return newFile(d.root, inode, node)
return newFile(d.root, forget, inode, node)
case "symlink":
return newLink(d.root, inode, node)
return newLink(d.root, forget, inode, node)
case "dev", "chardev", "fifo", "socket":
return newOther(d.root, inode, node)
return newOther(d.root, forget, inode, node)
default:
debug.Log(" node %v has unknown type %v", name, node.Type)
return nil, syscall.ENOENT
@ -244,3 +248,7 @@ func (d *dir) Listxattr(_ context.Context, req *fuse.ListxattrRequest, resp *fus
func (d *dir) Getxattr(_ context.Context, req *fuse.GetxattrRequest, resp *fuse.GetxattrResponse) error {
return nodeGetXattr(d.node, req, resp)
}
func (d *dir) Forget() {
d.forget()
}

23
internal/fuse/file.go
View file

@ -20,14 +20,16 @@ const blockSize = 512
// Statically ensure that *file and *openFile implement the given interfaces
var _ = fs.HandleReader(&openFile{})
var _ = fs.NodeListxattrer(&file{})
var _ = fs.NodeForgetter(&file{})
var _ = fs.NodeGetxattrer(&file{})
var _ = fs.NodeListxattrer(&file{})
var _ = fs.NodeOpener(&file{})
type file struct {
root *Root
node *restic.Node
inode uint64
root *Root
forget forgetFn
node *restic.Node
inode uint64
}
type openFile struct {
@ -36,12 +38,13 @@ type openFile struct {
cumsize []uint64
}
func newFile(root *Root, inode uint64, node *restic.Node) (fusefile *file, err error) {
func newFile(root *Root, forget forgetFn, inode uint64, node *restic.Node) (fusefile *file, err error) {
debug.Log("create new file for %v with %d blobs", node.Name, len(node.Content))
return &file{
inode: inode,
root: root,
node: node,
inode: inode,
forget: forget,
root: root,
node: node,
}, nil
}
@ -172,3 +175,7 @@ func (f *file) Listxattr(_ context.Context, req *fuse.ListxattrRequest, resp *fu
func (f *file) Getxattr(_ context.Context, req *fuse.GetxattrRequest, resp *fuse.GetxattrResponse) error {
return nodeGetXattr(f.node, req, resp)
}
func (f *file) Forget() {
f.forget()
}

6
internal/fuse/fuse_test.go
View file

@ -119,7 +119,7 @@ func TestFuseFile(t *testing.T) {
root := &Root{repo: repo, blobCache: bloblru.New(blobCacheSize)}
inode := inodeFromNode(1, node)
f, err := newFile(root, inode, node)
f, err := newFile(root, func() {}, inode, node)
rtest.OK(t, err)
of, err := f.Open(context.TODO(), nil, nil)
rtest.OK(t, err)
@ -162,7 +162,7 @@ func TestFuseDir(t *testing.T) {
}
parentInode := inodeFromName(0, "parent")
inode := inodeFromName(1, "foo")
d, err := newDir(root, inode, parentInode, node)
d, err := newDir(root, func() {}, inode, parentInode, node)
rtest.OK(t, err)
// don't open the directory as that would require setting up a proper tree blob
@ -276,7 +276,7 @@ func TestLink(t *testing.T) {
{Name: "foo", Value: []byte("bar")},
}}
lnk, err := newLink(&Root{}, 42, node)
lnk, err := newLink(&Root{}, func() {}, 42, node)
rtest.OK(t, err)
target, err := lnk.Readlink(context.TODO(), nil)
rtest.OK(t, err)

16
internal/fuse/link.go
View file

@ -12,18 +12,20 @@ import (
)
// Statically ensure that *link implements the given interface
var _ = fs.NodeForgetter(&link{})
var _ = fs.NodeGetxattrer(&link{})
var _ = fs.NodeListxattrer(&link{})
var _ = fs.NodeReadlinker(&link{})
type link struct {
root *Root
node *restic.Node
inode uint64
root *Root
forget forgetFn
node *restic.Node
inode uint64
}
func newLink(root *Root, inode uint64, node *restic.Node) (*link, error) {
return &link{root: root, inode: inode, node: node}, nil
func newLink(root *Root, forget forgetFn, inode uint64, node *restic.Node) (*link, error) {
return &link{root: root, forget: forget, inode: inode, node: node}, nil
}
func (l *link) Readlink(_ context.Context, _ *fuse.ReadlinkRequest) (string, error) {
@ -57,3 +59,7 @@ func (l *link) Listxattr(_ context.Context, req *fuse.ListxattrRequest, resp *fu
func (l *link) Getxattr(_ context.Context, req *fuse.GetxattrRequest, resp *fuse.GetxattrResponse) error {
return nodeGetXattr(l.node, req, resp)
}
func (l *link) Forget() {
l.forget()
}

16
internal/fuse/other.go
View file

@ -12,16 +12,18 @@ import (
)
// Statically ensure that *other implements the given interface
var _ = fs.NodeForgetter(&other{})
var _ = fs.NodeReadlinker(&other{})
type other struct {
root *Root
node *restic.Node
inode uint64
root *Root
forget forgetFn
node *restic.Node
inode uint64
}
func newOther(root *Root, inode uint64, node *restic.Node) (*other, error) {
return &other{root: root, inode: inode, node: node}, nil
func newOther(root *Root, forget forgetFn, inode uint64, node *restic.Node) (*other, error) {
return &other{root: root, forget: forget, inode: inode, node: node}, nil
}
func (l *other) Readlink(_ context.Context, _ *fuse.ReadlinkRequest) (string, error) {
@ -44,3 +46,7 @@ func (l *other) Attr(_ context.Context, a *fuse.Attr) error {
return nil
}
func (l *other) Forget() {
l.forget()
}

2
internal/fuse/root.go
View file

@ -66,7 +66,7 @@ func NewRoot(repo restic.Repository, cfg Config) *Root {
}
}
root.SnapshotsDir = NewSnapshotsDir(root, rootInode, rootInode, NewSnapshotsDirStructure(root, cfg.PathTemplates, cfg.TimeTemplate), "")
root.SnapshotsDir = NewSnapshotsDir(root, func() {}, rootInode, rootInode, NewSnapshotsDirStructure(root, cfg.PathTemplates, cfg.TimeTemplate), "")
return root
}

27
internal/fuse/snapshots_dir.go
View file

@ -19,6 +19,7 @@ import (
// It uses the saved prefix to select the corresponding MetaDirData.
type SnapshotsDir struct {
root *Root
forget forgetFn
inode uint64
parentInode uint64
dirStruct *SnapshotsDirStructure
@ -28,13 +29,15 @@ type SnapshotsDir struct {
// ensure that *SnapshotsDir implements these interfaces
var _ = fs.HandleReadDirAller(&SnapshotsDir{})
var _ = fs.NodeForgetter(&SnapshotsDir{})
var _ = fs.NodeStringLookuper(&SnapshotsDir{})
// NewSnapshotsDir returns a new directory structure containing snapshots and "latest" links
func NewSnapshotsDir(root *Root, inode, parentInode uint64, dirStruct *SnapshotsDirStructure, prefix string) *SnapshotsDir {
func NewSnapshotsDir(root *Root, forget forgetFn, inode, parentInode uint64, dirStruct *SnapshotsDirStructure, prefix string) *SnapshotsDir {
debug.Log("create snapshots dir, inode %d", inode)
return &SnapshotsDir{
root: root,
forget: forget,
inode: inode,
parentInode: parentInode,
dirStruct: dirStruct,
@ -109,7 +112,7 @@ func (d *SnapshotsDir) Lookup(ctx context.Context, name string) (fs.Node, error)
return nil, syscall.ENOENT
}
return d.cache.lookupOrCreate(name, func() (fs.Node, error) {
return d.cache.lookupOrCreate(name, func(forget forgetFn) (fs.Node, error) {
entry := meta.names[name]
if entry == nil {
return nil, syscall.ENOENT
@ -117,27 +120,33 @@ func (d *SnapshotsDir) Lookup(ctx context.Context, name string) (fs.Node, error)
inode := inodeFromName(d.inode, name)
if entry.linkTarget != "" {
return newSnapshotLink(d.root, inode, entry.linkTarget, entry.snapshot)
return newSnapshotLink(d.root, forget, inode, entry.linkTarget, entry.snapshot)
} else if entry.snapshot != nil {
return newDirFromSnapshot(d.root, inode, entry.snapshot)
return newDirFromSnapshot(d.root, forget, inode, entry.snapshot)
}
return NewSnapshotsDir(d.root, inode, d.inode, d.dirStruct, d.prefix+"/"+name), nil
return NewSnapshotsDir(d.root, forget, inode, d.inode, d.dirStruct, d.prefix+"/"+name), nil
})
}
func (d *SnapshotsDir) Forget() {
d.forget()
}
// SnapshotLink
type snapshotLink struct {
root *Root
forget forgetFn
inode uint64
target string
snapshot *restic.Snapshot
}
var _ = fs.NodeForgetter(&snapshotLink{})
var _ = fs.NodeReadlinker(&snapshotLink{})
// newSnapshotLink
func newSnapshotLink(root *Root, inode uint64, target string, snapshot *restic.Snapshot) (*snapshotLink, error) {
return &snapshotLink{root: root, inode: inode, target: target, snapshot: snapshot}, nil
func newSnapshotLink(root *Root, forget forgetFn, inode uint64, target string, snapshot *restic.Snapshot) (*snapshotLink, error) {
return &snapshotLink{root: root, forget: forget, inode: inode, target: target, snapshot: snapshot}, nil
}
// Readlink
@ -161,3 +170,7 @@ func (l *snapshotLink) Attr(_ context.Context, a *fuse.Attr) error {
return nil
}
func (l *snapshotLink) Forget() {
l.forget()
}

11
internal/fuse/tree_cache.go
View file

@ -14,13 +14,15 @@ type treeCache struct {
m sync.Mutex
}
type forgetFn func()
func newTreeCache() *treeCache {
return &treeCache{
nodes: map[string]fs.Node{},
}
}
func (t *treeCache) lookupOrCreate(name string, create func() (fs.Node, error)) (fs.Node, error) {
func (t *treeCache) lookupOrCreate(name string, create func(forget forgetFn) (fs.Node, error)) (fs.Node, error) {
t.m.Lock()
defer t.m.Unlock()
@ -28,7 +30,12 @@ func (t *treeCache) lookupOrCreate(name string, create func() (fs.Node, error))
return node, nil
}
node, err := create()
node, err := create(func() {
t.m.Lock()
defer t.m.Unlock()
delete(t.nodes, name)
})
if err != nil {
return nil, err
}