rename and delete in root fs fix

cmd/tstor/main.go

@@ -11,14 +11,12 @@ import (
 	_ "net/http/pprof"
 	"os"
 	"os/signal"
-	"path/filepath"
 	"syscall"
 
 	"git.kmsign.ru/royalcat/tstor/pkg/ctxbilly"
 	wnfs "git.kmsign.ru/royalcat/tstor/pkg/go-nfs"
 	"git.kmsign.ru/royalcat/tstor/pkg/rlog"
 	"git.kmsign.ru/royalcat/tstor/src/config"
-	"git.kmsign.ru/royalcat/tstor/src/delivery"
 	"git.kmsign.ru/royalcat/tstor/src/sources"
 	"git.kmsign.ru/royalcat/tstor/src/sources/qbittorrent"
 	"git.kmsign.ru/royalcat/tstor/src/sources/ytdlp"
@@ -189,15 +187,6 @@ func run(configPath string) error {
 		}
 	}()
 
-	go func() {
-		logFilename := filepath.Join(conf.Log.Path, "logs")
-
-		err := delivery.Run(nil, sfs, logFilename, conf)
-		if err != nil {
-			log.Error(ctx, "error initializing HTTP server", rlog.Error(err))
-		}
-	}()
-
 	sigChan := make(chan os.Signal, 1)
 	signal.Notify(sigChan, os.Interrupt, syscall.SIGINT, syscall.SIGTERM)
 	<-sigChan

go.mod

@@ -2,6 +2,8 @@ module git.kmsign.ru/royalcat/tstor
 
 go 1.22.3
 
+replace github.com/iceber/iouring-go => github.com/royalcat/iouring-go v0.0.0-20240925200811-286062ac1b23
+
 require (
 	github.com/99designs/gqlgen v0.17.49
 	github.com/agoda-com/opentelemetry-go/otelslog v0.1.1
@@ -21,6 +23,7 @@ require (
 	github.com/grafana/otel-profiling-go v0.5.1
 	github.com/grafana/pyroscope-go v1.1.2
 	github.com/hashicorp/golang-lru/v2 v2.0.7
+	github.com/iceber/iouring-go v0.0.0-20230403020409-002cfd2e2a90
 	github.com/knadh/koanf/parsers/yaml v0.1.0
 	github.com/knadh/koanf/providers/env v0.1.0
 	github.com/knadh/koanf/providers/file v0.1.0

go.sum

@@ -528,6 +528,8 @@ github.com/royalcat/ctxio v0.0.0-20240602060200-590d464c39be h1:Ui+Imq1Vk26rfpkL
 github.com/royalcat/ctxio v0.0.0-20240602060200-590d464c39be/go.mod h1:NFNp3OsEMUPYj5LZUFDiyDt+2E6gR/g8JLd0k+y8XWI=
 github.com/royalcat/ctxprogress v0.0.0-20240614113930-3cc5bb935bff h1:KlZaOEZYhCzyNYIp0LcE7MNR2Ar0PJS3eJU6A5mMTpk=
 github.com/royalcat/ctxprogress v0.0.0-20240614113930-3cc5bb935bff/go.mod h1:RcUpbosy/m3bJ3JsVO18MXEbrKRHOHkmYBXigDGekaA=
+github.com/royalcat/iouring-go v0.0.0-20240925200811-286062ac1b23 h1:3yOlLKYd6iSGkRUOCPuBQibjjvZyrGB/4sm0fh3nNuQ=
+github.com/royalcat/iouring-go v0.0.0-20240925200811-286062ac1b23/go.mod h1:LEzdaZarZ5aqROlLIwJ4P7h3+4o71008fSy6wpaEB+s=
 github.com/royalcat/kv v0.0.0-20240707205211-fedd4883af85 h1:AAuCp03M23u4qrK3dT1afFgf+diEijvSFnHb93Lv3PY=
 github.com/royalcat/kv v0.0.0-20240707205211-fedd4883af85/go.mod h1:UB/VwpTut8c3IXLJFvYWFxAAZymk9eBuJRMJmpSpwYU=
 github.com/royalcat/kv/kvbadger v0.0.0-20240707205211-fedd4883af85 h1:OXRYz+eDPAlQjE1UCSIoBzVHjQ3Ayx7fGSM/Zlo3bhI=
@@ -782,6 +784,7 @@ golang.org/x/sys v0.0.0-20200122134326-e047566fdf82/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20200212091648-12a6c2dcc1e4/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200302150141-5c8b2ff67527/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200413165638-669c56c373c4/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20200923182605-d9f96fdee20d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200930185726-fdedc70b468f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210423082822-04245dca01da/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=

pkg/uring/file.go

@@ -0,0 +1,112 @@
+package uring
+
+import (
+	"context"
+	"os"
+
+	"github.com/iceber/iouring-go"
+	"go.opentelemetry.io/otel"
+	"go.opentelemetry.io/otel/attribute"
+	"go.opentelemetry.io/otel/trace"
+)
+
+var tracer = otel.Tracer("github.com/royalcat/tstor/pkg/uring")
+
+type FS struct {
+	ur *iouring.IOURing
+}
+
+func NewFS(ur *iouring.IOURing) *FS {
+	return &FS{
+		ur: ur,
+	}
+}
+
+func (o *FS) OpenFile(ctx context.Context, name string) (File, error) {
+	ctx, span := tracer.Start(ctx, "uring.FS.OpenFile", trace.WithAttributes(attribute.String("name", name)))
+	defer span.End()
+
+	f, err := os.Open(name)
+	if err != nil {
+		return File{}, err
+	}
+
+	return File{
+		ur: o.ur,
+		f:  f,
+	}, nil
+}
+
+func NewFile(ur *iouring.IOURing, f *os.File) *File {
+	return &File{
+		ur: ur,
+		f:  f,
+	}
+}
+
+type File struct {
+	ur *iouring.IOURing
+	f  *os.File
+}
+
+func (o *File) pread(ctx context.Context, b []byte, off uint64) (int, error) {
+	ctx, span := tracer.Start(ctx, "uring.File.pread", trace.WithAttributes(attribute.Int("size", len(b))))
+	defer span.End()
+
+	req, err := o.ur.Pread(o.f, b, off, nil)
+	if err != nil {
+		return 0, err
+	}
+
+	select {
+	case <-req.Done():
+		return req.GetRes()
+	case <-ctx.Done():
+		if _, err := req.Cancel(); err != nil {
+			return 0, err
+		}
+		<-req.Done()
+		return 0, ctx.Err()
+	}
+}
+
+func (f *File) ReadAt(ctx context.Context, b []byte, off int64) (n int, err error) {
+	ctx, span := tracer.Start(ctx, "uring.File.ReadAt", trace.WithAttributes(attribute.Int("size", len(b))))
+	defer span.End()
+
+	return f.f.ReadAt(b, off)
+
+	for len(b) > 0 {
+		if ctx.Err() != nil {
+			err = ctx.Err()
+			break
+		}
+
+		m, e := f.pread(ctx, b, uint64(off))
+		if e != nil {
+			err = e
+			break
+		}
+		n += m
+		b = b[m:]
+		off += int64(m)
+	}
+
+	return n, err
+}
+
+func (o *File) Close(ctx context.Context) error {
+	return o.f.Close()
+}
+
+func waitRequest(ctx context.Context, req iouring.Request) (int, error) {
+	select {
+	case <-req.Done():
+		return req.GetRes()
+	case <-ctx.Done():
+		if _, err := req.Cancel(); err != nil {
+			return 0, err
+		}
+		return 0, ctx.Err()
+	}
+}

src/export/nfs/wrapper.go

@@ -118,8 +118,8 @@ func (bfs *fsWrapper) Remove(ctx context.Context, filename string) error {
 }
 
 // Rename implements billy.Filesystem.
-func (*fsWrapper) Rename(ctx context.Context, oldpath string, newpath string) error {
+func (bfs *fsWrapper) Rename(ctx context.Context, oldpath string, newpath string) error {
-	return billy.ErrNotSupported
+	return bfs.fs.Rename(ctx, oldpath, newpath)
 }
 
 // Root implements billy.Filesystem.

src/sources/qbittorrent/daemon.go

@@ -19,6 +19,7 @@ import (
 	"github.com/anacrolix/torrent/metainfo"
 	"github.com/anacrolix/torrent/types/infohash"
 	infohash_v2 "github.com/anacrolix/torrent/types/infohash-v2"
+	"github.com/iceber/iouring-go"
 	"github.com/royalcat/ctxio"
 	"go.opentelemetry.io/otel"
 )
@@ -30,6 +31,7 @@ type Daemon struct {
 	qb      qbittorrent.Client
 	client  *cacheClient
 	dataDir string
+	ur      *iouring.IOURing
 	log     *rlog.Logger
 }
 
@@ -90,7 +92,8 @@ func NewDaemon(conf config.QBittorrent) (*Daemon, error) {
 	}
 
 	for { // wait for qbittorrent to start
-		_, err = qb.Application().Version(ctx)
+		ver, err := qb.Application().Version(ctx)
+		log.Info(ctx, "qbittorrent started", slog.String("version", ver))
 		if err == nil {
 			break
 		}
@@ -110,10 +113,16 @@ func NewDaemon(conf config.QBittorrent) (*Daemon, error) {
 		return nil, err
 	}
 
+	ur, err := iouring.New(8, iouring.WithAsync())
+	if err != nil {
+		return nil, err
+	}
+
 	return &Daemon{
 		qb:      qb,
 		proc:    proc,
 		dataDir: conf.DataFolder,
+		ur:      ur,
 		client:  wrapClient(qb),
 		log:     rlog.Component("qbittorrent"),
 	}, nil
@@ -162,7 +171,7 @@ func (fs *Daemon) GetTorrentFS(ctx context.Context, file vfs.File) (vfs.Filesyst
 		return nil, fmt.Errorf("error syncing torrent state: %w", err)
 	}
 
-	return newTorrentFS(ctx, fs.client, file.Name(), ih.HexString(), torrentPath)
+	return newTorrentFS(ctx, fs.ur, fs.client, file.Name(), ih.HexString(), torrentPath)
 }
 
 func (d *Daemon) syncTorrentState(ctx context.Context, file vfs.File, ih metainfo.Hash, torrentPath string) error {

src/sources/qbittorrent/fs.go

@@ -15,7 +15,9 @@ import (
 
 	"git.kmsign.ru/royalcat/tstor/pkg/qbittorrent"
 	"git.kmsign.ru/royalcat/tstor/pkg/rlog"
+	"git.kmsign.ru/royalcat/tstor/pkg/uring"
 	"git.kmsign.ru/royalcat/tstor/src/vfs"
+	"github.com/iceber/iouring-go"
 )
 
 type FS struct {
@@ -25,6 +27,8 @@ type FS struct {
 	hash    string
 	dataDir string // directory where torrent files are stored
 
+	ur *iouring.IOURing
+
 	entries map[string]fileEntry
 
 	log *rlog.Logger
@@ -39,7 +43,7 @@ type fileEntry struct {
 
 var _ vfs.Filesystem = (*FS)(nil)
 
-func newTorrentFS(ctx context.Context, client *cacheClient, name string, hash string, dataDir string) (*FS, error) {
+func newTorrentFS(ctx context.Context, ur *iouring.IOURing, client *cacheClient, name string, hash string, dataDir string) (*FS, error) {
 	ctx, span := trace.Start(ctx, "newTorrentFS")
 	defer span.End()
 
@@ -69,6 +73,8 @@ func newTorrentFS(ctx context.Context, client *cacheClient, name string, hash st
 
 		entries: entries,
 
+		ur: ur,
+
 		log: rlog.Component("qbittorrent", "fs"),
 
 		FilesystemPrototype: vfs.FilesystemPrototype(name),
@@ -82,7 +88,7 @@ func (f *FS) Open(ctx context.Context, name string) (vfs.File, error) {
 	}
 
 	if entry, ok := f.entries[name]; ok {
-		return openFile(ctx, f.client, f.dataDir, f.hash, entry.Content)
+		return openFile(ctx, f.ur, f.client, f.dataDir, f.hash, entry.Content)
 	}
 
 	for p := range f.entries {
@@ -144,6 +150,27 @@ func (f *FS) Unlink(ctx context.Context, filename string) error {
 	return vfs.ErrNotExist
 }
 
+func (f *FS) Rename(ctx context.Context, oldpath string, newpath string) error {
+	oldpath = vfs.AbsPath(path.Clean(oldpath))
+	newpath = vfs.AbsPath(path.Clean(newpath))
+
+	if _, ok := f.entries[oldpath]; ok {
+		err := f.client.qb.Torrent().RenameFile(ctx, f.hash, vfs.RelPath(oldpath), vfs.RelPath(newpath))
+		if err != nil {
+			return fmt.Errorf("failed to rename file %s to %s: %w", oldpath, newpath, err)
+		}
+
+		f.mu.Lock()
+		defer f.mu.Unlock()
+
+		f.entries[newpath] = f.entries[oldpath]
+
+		return nil
+	}
+
+	return vfs.ErrNotExist
+}
+
 func (f *FS) removeFile(ctx context.Context, hash string, content *qbittorrent.TorrentContent) error {
 	log := f.log.With(slog.String("hash", hash), slog.String("file", content.Name))
 
@@ -170,12 +197,17 @@ func (f *FS) removeFile(ctx context.Context, hash string, content *qbittorrent.T
 	return nil
 }
 
-func openFile(ctx context.Context, client *cacheClient, torrentDir string, hash string, content *qbittorrent.TorrentContent) (*File, error) {
+func openFile(ctx context.Context, ur *iouring.IOURing, client *cacheClient, torrentDir string, hash string, content *qbittorrent.TorrentContent) (*File, error) {
 	props, err := client.getProperties(ctx, hash)
 	if err != nil {
 		return nil, err
 	}
 
+	file, err := os.OpenFile(path.Join(torrentDir, content.Name), os.O_RDONLY, 0)
+	if err != nil {
+		return nil, err
+	}
+
 	return &File{
 		client:     client,
 		hash:       hash,
@@ -186,6 +218,8 @@ func openFile(ctx context.Context, client *cacheClient, torrentDir string, hash
 		pieceSize:    props.PieceSize,
 		fileSize:     content.Size,
 
+		file: uring.NewFile(ur, file),
+
 		offset: 0,
 	}, nil
 }
@@ -199,8 +233,9 @@ type File struct {
 	pieceSize    int
 	fileSize     int64
 
+	mu     sync.Mutex
+	file   *uring.File
 	offset int64
-	osfile *os.File
 }
 
 var _ vfs.File = (*File)(nil)
@@ -298,33 +333,26 @@ func (f *File) waitPieceAvailable(ctx context.Context, offset int64, size int) e
 }
 
 // Read implements vfs.File.
-func (f *File) Read(ctx context.Context, p []byte) (n int, err error) {
+func (f *File) Read(ctx context.Context, p []byte) (int, error) {
+	f.mu.Lock()
+	defer f.mu.Unlock()
+
 	if err := f.waitPieceAvailable(ctx, f.offset, len(p)); err != nil {
 		return 0, err
 	}
 
-	descriptor, err := f.descriptor()
+	n, err := f.file.ReadAt(ctx, p, f.offset)
-	if err != nil {
-		return 0, err
-	}
-
-	n, err = descriptor.ReadAt(p, f.offset)
 	f.offset += int64(n)
 	return n, err
 }
 
 // ReadAt implements vfs.File.
-func (f *File) ReadAt(ctx context.Context, p []byte, off int64) (n int, err error) {
+func (f *File) ReadAt(ctx context.Context, p []byte, off int64) (int, error) {
 	if err := f.waitPieceAvailable(ctx, f.offset, len(p)); err != nil {
 		return 0, err
 	}
 
-	descriptor, err := f.descriptor()
+	return f.file.ReadAt(ctx, p, off)
-	if err != nil {
-		return 0, err
-	}
-
-	return descriptor.ReadAt(p, off)
 }
 
 // Size implements vfs.File.
@@ -337,28 +365,9 @@ func (f *File) Type() fs.FileMode {
 	return fs.ModeDir
 }
 
-func (f *File) descriptor() (*os.File, error) {
-	if f.osfile != nil {
-		return f.osfile, nil
-	}
-
-	osfile, err := os.Open(path.Join(f.torrentDir, f.filePath))
-	if err != nil {
-		return nil, err
-	}
-	f.osfile = osfile
-
-	return f.osfile, nil
-}
-
 // Close implements vfs.File.
 func (f *File) Close(ctx context.Context) error {
-	if f.osfile != nil {
+	return f.file.Close(ctx)
-		err := f.osfile.Close()
-		f.osfile = nil
-		return err
-	}
-	return nil
 }
 
 type fileInfo struct {

src/sources/qbittorrent/install.go

@@ -6,6 +6,7 @@ import (
 	"errors"
 	"fmt"
 	"io"
+	"log/slog"
 	"net/http"
 	"os"
 	"os/exec"
@@ -85,10 +86,13 @@ func downloadLatestQbitRelease(ctx context.Context, binPath string) error {
 	if err != nil {
 		return err
 	}
-	return downloadFile(binPath, downloadUrl)
+
+	slog.InfoContext(ctx, "downloading latest qbittorrent-nox release", slog.String("url", downloadUrl))
+
+	return downloadFile(ctx, binPath, downloadUrl)
 }
 
-func downloadFile(filepath string, webUrl string) error {
+func downloadFile(ctx context.Context, filepath string, webUrl string) error {
 	if stat, err := os.Stat(filepath); err == nil {
 		resp, err := http.Head(webUrl)
 		if err != nil {
@@ -107,6 +111,7 @@ func downloadFile(filepath string, webUrl string) error {
 		}
 
 		if resp.ContentLength == stat.Size() && lastModified.Before(stat.ModTime()) {
+			slog.InfoContext(ctx, "there is already newest version of the file", slog.String("filepath", filepath))
 			return nil
 		}
 	}
@@ -118,8 +123,13 @@ func downloadFile(filepath string, webUrl string) error {
 	}
 	defer out.Close()
 
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, webUrl, nil)
+	if err != nil {
+		return err
+	}
+
 	// Get the data
-	resp, err := http.Get(webUrl)
+	resp, err := http.DefaultClient.Do(req)
 	if err != nil {
 		return err
 	}

src/sources/torrent/fs.go

@@ -383,6 +383,11 @@ func (fs *TorrentFS) Unlink(ctx context.Context, name string) error {
 	return fs.Torrent.ExcludeFile(ctx, tfile.file)
 }
 
+// Rename implements vfs.Filesystem.
+func (s *TorrentFS) Rename(ctx context.Context, oldpath string, newpath string) error {
+	return vfs.ErrNotImplemented
+}
+
 var _ vfs.File = (*torrentFile)(nil)
 
 type torrentFile struct {

src/sources/ytdlp/fs.go

@@ -68,3 +68,8 @@ func (s *SourceFS) Stat(ctx context.Context, filename string) (fs.FileInfo, erro
 func (s *SourceFS) Unlink(ctx context.Context, filename string) error {
 	return vfs.ErrNotImplemented
 }
+
+// Rename implements vfs.Filesystem.
+func (s *SourceFS) Rename(ctx context.Context, oldpath string, newpath string) error {
+	return vfs.ErrNotImplemented
+}

src/vfs/archive.go

@@ -54,6 +54,11 @@ type ArchiveFS struct {
 	files map[string]File
 }
 
+// Rename implements Filesystem.
+func (a *ArchiveFS) Rename(ctx context.Context, oldpath string, newpath string) error {
+	return ErrNotImplemented
+}
+
 // ModTime implements Filesystem.
 func (a *ArchiveFS) ModTime() time.Time {
 	return time.Time{}
@@ -257,6 +262,9 @@ func (d *archiveFile) loadMore(ctx context.Context, to int64) error {
 }
 
 func (d *archiveFile) Read(ctx context.Context, p []byte) (n int, err error) {
+	ctx, span := tracer.Start(ctx, "archive.File.Read")
+	defer span.End()
+
 	d.m.Lock()
 	defer d.m.Unlock()
 

src/vfs/ctxbillyfs.go

@@ -65,6 +65,11 @@ func (c *CtxBillyFs) ReadDir(ctx context.Context, path string) ([]fs.DirEntry, e
 	return entries, nil
 }
 
+// Rename implements Filesystem.
+func (c *CtxBillyFs) Rename(ctx context.Context, oldpath string, newpath string) error {
+	return c.fs.Rename(ctx, oldpath, newpath)
+}
+
 type infoEntry struct {
 	fs.FileInfo
 }
@@ -93,7 +98,7 @@ func (c *CtxBillyFs) Type() fs.FileMode {
 
 // Unlink implements Filesystem.
 func (c *CtxBillyFs) Unlink(ctx context.Context, filename string) error {
-	return fs.ErrInvalid
+	return c.fs.Remove(ctx, filename)
 }
 
 func NewCtxBillyFile(info fs.FileInfo, bf ctxbilly.File) *CtxBillyFile {

src/vfs/dummy.go

@@ -14,6 +14,11 @@ type DummyFs struct {
 	name string
 }
 
+// Rename implements Filesystem.
+func (d *DummyFs) Rename(ctx context.Context, oldpath string, newpath string) error {
+	return ErrNotImplemented
+}
+
 // ModTime implements Filesystem.
 func (d *DummyFs) ModTime() time.Time {
 	return time.Time{}

src/vfs/fs.go

@@ -37,6 +37,8 @@ type Filesystem interface {
 	Stat(ctx context.Context, filename string) (fs.FileInfo, error)
 	Unlink(ctx context.Context, filename string) error
 
+	Rename(ctx context.Context, oldpath, newpath string) error
+
 	// As filesystem mounted to some path, make sense to have the filesystem implement DirEntry
 	fs.DirEntry
 }

src/vfs/log.go

@@ -202,6 +202,25 @@ func (fs *LogFS) Unlink(ctx context.Context, filename string) (err error) {
 	return err
 }
 
+// Rename implements Filesystem.
+func (lfs *LogFS) Rename(ctx context.Context, oldpath string, newpath string) error {
+	ctx, cancel := context.WithTimeout(ctx, lfs.timeout)
+	defer cancel()
+	ctx, span := tracer.Start(ctx, "Rename",
+		lfs.traceAttrs(
+			attribute.String("oldpath", oldpath),
+			attribute.String("newpath", newpath),
+		),
+	)
+	defer span.End()
+
+	err := lfs.fs.Rename(ctx, oldpath, newpath)
+	if isLoggableError(err) {
+		lfs.log.Error(ctx, "Failed to rename", rlog.Error(err))
+	}
+	return err
+}
+
 type LogFile struct {
 	filename string
 	f        File

src/vfs/memory.go

@@ -60,6 +60,11 @@ func (mfs *MemoryFs) Type() fs.FileMode {
 	return fs.ModeDir
 }
 
+// Rename implements Filesystem.
+func (mfs *MemoryFs) Rename(ctx context.Context, oldpath string, newpath string) error {
+	return ErrNotImplemented
+}
+
 func NewMemoryFS(name string, files map[string]*MemoryFile) *MemoryFs {
 	return &MemoryFs{
 		name:  name,

src/vfs/os.go

@@ -2,6 +2,7 @@ package vfs
 
 import (
 	"context"
+	"fmt"
 	"io/fs"
 	"os"
 	"path"
@@ -29,7 +30,11 @@ func (fs *OsFS) Stat(ctx context.Context, filename string) (fs.FileInfo, error)
 
 // Unlink implements Filesystem.
 func (fs *OsFS) Unlink(ctx context.Context, filename string) error {
-	return os.RemoveAll(path.Join(fs.hostDir, filename))
+	err := os.Remove(path.Join(fs.hostDir, filename))
+	if err != nil {
+		return fmt.Errorf("failed to remove %s: %w", filename, err)
+	}
+	return nil
 }
 
 // Open implements Filesystem.
@@ -41,6 +46,11 @@ func (fs *OsFS) Open(ctx context.Context, filename string) (File, error) {
 	return NewLazyOsFile(path.Join(fs.hostDir, filename))
 }
 
+// Rename implements Filesystem.
+func (fs *OsFS) Rename(ctx context.Context, oldpath string, newpath string) error {
+	return os.Rename(path.Join(fs.hostDir, oldpath), path.Join(fs.hostDir, newpath))
+}
+
 // ReadDir implements Filesystem.
 func (o *OsFS) ReadDir(ctx context.Context, dir string) ([]fs.DirEntry, error) {
 	return os.ReadDir(path.Join(o.hostDir, dir))

src/vfs/resolver.go

@@ -175,6 +175,31 @@ func (r *ResolverFS) Unlink(ctx context.Context, filename string) error {
 	return r.rootFS.Unlink(ctx, fsPath)
 }
 
+// Rename implements Filesystem.
+func (r *ResolverFS) Rename(ctx context.Context, oldpath string, newpath string) error {
+	oldFsPath, oldNestedFs, oldNestedFsPath, err := r.resolver.ResolvePath(ctx, oldpath, r.rootFS.Open)
+	if err != nil {
+		return err
+	}
+	newFsPath, newNestedFs, newNestedFsPath, err := r.resolver.ResolvePath(ctx, newpath, r.rootFS.Open)
+	if err != nil {
+		return err
+	}
+
+	if oldNestedFs == nil && newNestedFs == nil {
+		return r.rootFS.Rename(ctx, oldFsPath, newFsPath)
+	}
+
+	fmt.Println(oldNestedFs)
+	fmt.Println(newNestedFs)
+
+	if oldNestedFs == nil || newNestedFs == nil || oldNestedFs == newNestedFs {
+		return oldNestedFs.Rename(ctx, oldNestedFsPath, newNestedFsPath)
+	}
+
+	return fmt.Errorf("rename between different nested filesystems is not supported")
+}
+
 // Info implements Filesystem.
 func (r *ResolverFS) Info() (fs.FileInfo, error) {
 	return r, nil