improve worm support (#5983)

* improve worm support

Signed-off-by: lou <alex1988@outlook.com>

* worm mode in filer

Signed-off-by: lou <alex1988@outlook.com>

* update after review

Signed-off-by: lou <alex1988@outlook.com>

* update after review

Signed-off-by: lou <alex1988@outlook.com>

* move to fs configure

Signed-off-by: lou <alex1988@outlook.com>

* remove flag

Signed-off-by: lou <alex1988@outlook.com>

* update after review

Signed-off-by: lou <alex1988@outlook.com>

* support worm hardlink

Signed-off-by: lou <alex1988@outlook.com>

* update after review

Signed-off-by: lou <alex1988@outlook.com>

* typo

Signed-off-by: lou <alex1988@outlook.com>

* sync filer conf

Signed-off-by: lou <alex1988@outlook.com>

---------

Signed-off-by: lou <alex1988@outlook.com>

other/java/client/src/main/proto/filer.proto

@@ -442,6 +442,7 @@ message FilerConf {
         string data_node = 11;
         uint32 max_file_name_length = 12;
         bool disable_chunk_deletion = 13;
+        bool worm = 14;
     }
     repeated PathConf locations = 2;
 }

weed/command/mount.go

@@ -33,7 +33,6 @@ type MountOptions struct {
 	localSocket        *string
 	disableXAttr       *bool
 	extraOptions       []string
-	writeOnceReadMany  *bool
 }
 
 var (
@@ -71,7 +70,6 @@ func init() {
 	mountOptions.debugPort = cmdMount.Flag.Int("debug.port", 6061, "http port for debugging")
 	mountOptions.localSocket = cmdMount.Flag.String("localSocket", "", "default to /tmp/seaweedfs-mount-<mount_dir_hash>.sock")
 	mountOptions.disableXAttr = cmdMount.Flag.Bool("disableXAttr", false, "disable xattr")
-	mountOptions.writeOnceReadMany = cmdMount.Flag.Bool("writeOnceReadMany", false, "write once, read many times")
 
 	mountCpuProfile = cmdMount.Flag.String("cpuprofile", "", "cpu profile output file")
 	mountMemProfile = cmdMount.Flag.String("memprofile", "", "memory profile output file")

weed/command/mount_std.go

@@ -6,6 +6,15 @@ package command
 import (
 	"context"
 	"fmt"
+	"net"
+	"net/http"
+	"os"
+	"os/user"
+	"runtime"
+	"strconv"
+	"strings"
+	"time"
+
 	"github.com/hanwen/go-fuse/v2/fuse"
 	"github.com/seaweedfs/seaweedfs/weed/glog"
 	"github.com/seaweedfs/seaweedfs/weed/mount"
@@ -17,14 +26,6 @@ import (
 	"github.com/seaweedfs/seaweedfs/weed/security"
 	"github.com/seaweedfs/seaweedfs/weed/storage/types"
 	"google.golang.org/grpc/reflection"
-	"net"
-	"net/http"
-	"os"
-	"os/user"
-	"runtime"
-	"strconv"
-	"strings"
-	"time"
 
 	"github.com/seaweedfs/seaweedfs/weed/util"
 	"github.com/seaweedfs/seaweedfs/weed/util/grace"
@@ -247,7 +248,6 @@ func RunMount(option *MountOptions, umask os.FileMode) bool {
 		Cipher:             cipher,
 		UidGidMapper:       uidGidMapper,
 		DisableXAttr:       *option.disableXAttr,
-		WriteOnceReadMany:  *option.writeOnceReadMany,
 	})
 
 	// create mount root
@@ -271,7 +271,11 @@ func RunMount(option *MountOptions, umask os.FileMode) bool {
 	reflection.Register(grpcS)
 	go grpcS.Serve(montSocketListener)
 
-	seaweedFileSystem.StartBackgroundTasks()
+	err = seaweedFileSystem.StartBackgroundTasks()
+	if err != nil {
+		fmt.Printf("failed to start background tasks: %v\n", err)
+		return false
+	}
 
 	glog.V(0).Infof("mounted %s%s to %v", *option.filer, mountRoot, dir)
 	glog.V(0).Infof("This is SeaweedFS version %s %s %s", util.Version(), runtime.GOOS, runtime.GOARCH)

weed/filer/filer_conf.go

@@ -4,10 +4,11 @@ import (
 	"bytes"
 	"context"
 	"fmt"
+	"io"
+
 	"github.com/seaweedfs/seaweedfs/weed/pb"
 	"github.com/seaweedfs/seaweedfs/weed/wdclient"
 	"google.golang.org/grpc"
-	"io"
 
 	"github.com/seaweedfs/seaweedfs/weed/glog"
 	"github.com/seaweedfs/seaweedfs/weed/pb/filer_pb"
@@ -111,7 +112,7 @@ func (fc *FilerConf) doLoadConf(conf *filer_pb.FilerConf) (err error) {
 	return nil
 }
 
-func (fc *FilerConf) GetLocationConf(locationPrefix string)(locConf *filer_pb.FilerConf_PathConf, found bool) {
+func (fc *FilerConf) GetLocationConf(locationPrefix string) (locConf *filer_pb.FilerConf_PathConf, found bool) {
 	return fc.rules.Get([]byte(locationPrefix))
 }
 
@@ -188,6 +189,7 @@ func mergePathConf(a, b *filer_pb.FilerConf_PathConf) {
 	a.Rack = util.Nvl(b.Rack, a.Rack)
 	a.DataNode = util.Nvl(b.DataNode, a.DataNode)
 	a.DisableChunkDeletion = b.DisableChunkDeletion || a.DisableChunkDeletion
+	a.Worm = b.Worm || a.Worm
 }
 
 func (fc *FilerConf) ToProto() *filer_pb.FilerConf {

weed/mount/filer_conf.go

@@ -0,0 +1,118 @@
+package mount
+
+import (
+	"fmt"
+	"path/filepath"
+	"sync/atomic"
+	"time"
+
+	"github.com/seaweedfs/seaweedfs/weed/filer"
+	"github.com/seaweedfs/seaweedfs/weed/glog"
+	"github.com/seaweedfs/seaweedfs/weed/pb"
+	"github.com/seaweedfs/seaweedfs/weed/pb/filer_pb"
+	"github.com/seaweedfs/seaweedfs/weed/util"
+)
+
+func (wfs *WFS) subscribeFilerConfEvents() (func(), error) {
+	now := time.Now()
+	confDir := filer.DirectoryEtcSeaweedFS
+	confName := filer.FilerConfName
+	confFullName := filepath.Join(filer.DirectoryEtcSeaweedFS, filer.FilerConfName)
+
+	// read current conf
+	err := wfs.WithFilerClient(false, func(client filer_pb.SeaweedFilerClient) error {
+		content, err := filer.ReadInsideFiler(client, confDir, confName)
+		if err != nil {
+			return err
+		}
+
+		fc := filer.NewFilerConf()
+		if len(content) > 0 {
+			if err := fc.LoadFromBytes(content); err != nil {
+				return fmt.Errorf("parse %s: %v", confFullName, err)
+			}
+		}
+
+		wfs.FilerConf = fc
+
+		return nil
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	processEventFn := func(resp *filer_pb.SubscribeMetadataResponse) error {
+		message := resp.EventNotification
+		if message.NewEntry == nil {
+			return nil
+		}
+
+		dir := resp.Directory
+		name := resp.EventNotification.NewEntry.Name
+
+		if dir != confDir || name != confName {
+			return nil
+		}
+
+		content := message.NewEntry.Content
+		fc := filer.NewFilerConf()
+		if len(content) > 0 {
+			if err = fc.LoadFromBytes(content); err != nil {
+				return fmt.Errorf("parse %s: %v", confFullName, err)
+			}
+		}
+
+		wfs.FilerConf = fc
+
+		return nil
+	}
+
+	metadataFollowOption := &pb.MetadataFollowOption{
+		ClientName:             "fuse",
+		ClientId:               wfs.signature,
+		ClientEpoch:            1,
+		SelfSignature:          0,
+		PathPrefix:             confFullName,
+		AdditionalPathPrefixes: nil,
+		StartTsNs:              now.UnixNano(),
+		StopTsNs:               0,
+		EventErrorType:         pb.FatalOnError,
+	}
+
+	return func() {
+		// sync new conf changes
+		util.RetryUntil("followFilerConfChanges", func() error {
+			metadataFollowOption.ClientEpoch++
+			i := atomic.LoadInt32(&wfs.option.filerIndex)
+			n := len(wfs.option.FilerAddresses)
+			err = pb.FollowMetadata(wfs.option.FilerAddresses[i], wfs.option.GrpcDialOption, metadataFollowOption, processEventFn)
+			if err == nil {
+				atomic.StoreInt32(&wfs.option.filerIndex, i)
+				return nil
+			}
+
+			i++
+			if i >= int32(n) {
+				i = 0
+			}
+
+			return err
+		}, func(err error) bool {
+			glog.V(0).Infof("fuse follow filer conf changes: %v", err)
+			return true
+		})
+	}, nil
+}
+
+func (wfs *WFS) wormEnabledForEntry(path util.FullPath, entry *filer_pb.Entry) bool {
+	if entry == nil || entry.Attributes == nil {
+		return false
+	}
+
+	rule := wfs.FilerConf.MatchStorageRule(string(path))
+	if !rule.Worm {
+		return false
+	}
+
+	return entry.Attributes.FileSize > 0 || entry.Attributes.Crtime != entry.Attributes.Mtime
+}

weed/mount/weedfs.go

@@ -47,8 +47,6 @@ type Option struct {
 	Quota              int64
 	DisableXAttr       bool
 
-	WriteOnceReadMany bool
-
 	MountUid         uint32
 	MountGid         uint32
 	MountMode        os.FileMode
@@ -82,6 +80,7 @@ type WFS struct {
 	fuseServer        *fuse.Server
 	IsOverQuota       bool
 	fhLockTable       *util.LockTable[FileHandleId]
+	FilerConf         *filer.FilerConf
 }
 
 func NewSeaweedFileSystem(option *Option) *WFS {
@@ -141,10 +140,19 @@ func NewSeaweedFileSystem(option *Option) *WFS {
 	return wfs
 }
 
-func (wfs *WFS) StartBackgroundTasks() {
+func (wfs *WFS) StartBackgroundTasks() error {
+	fn, err := wfs.subscribeFilerConfEvents()
+	if err != nil {
+		return err
+	}
+
+	go fn()
+
 	startTime := time.Now()
 	go meta_cache.SubscribeMetaEvents(wfs.metaCache, wfs.signature, wfs, wfs.option.FilerMountRootPath, startTime.UnixNano())
 	go wfs.loopCheckQuota()
+
+	return nil
 }
 
 func (wfs *WFS) String() string {

weed/mount/weedfs_file_io.go

@@ -65,6 +65,7 @@ func (wfs *WFS) Open(cancel <-chan struct{}, in *fuse.OpenIn, out *fuse.OpenOut)
 	fileHandle, status = wfs.AcquireHandle(in.NodeId, in.Flags, in.Uid, in.Gid)
 	if status == fuse.OK {
 		out.Fh = uint64(fileHandle.fh)
+		out.OpenFlags = in.Flags
 		// TODO https://github.com/libfuse/libfuse/blob/master/include/fuse_common.h#L64
 	}
 	return status

weed/mount/weedfs_file_mkrm.go

@@ -130,6 +130,10 @@ func (wfs *WFS) Unlink(cancel <-chan struct{}, header *fuse.InHeader, name strin
 		return code
 	}
 
+	if wfs.wormEnabledForEntry(entryFullPath, entry) {
+		return fuse.EPERM
+	}
+
 	// first, ensure the filer store can correctly delete
 	glog.V(3).Infof("remove file: %v", entryFullPath)
 	isDeleteData := entry != nil && entry.HardLinkCounter <= 1

weed/mount/weedfs_file_sync.go

@@ -3,13 +3,14 @@ package mount
 import (
 	"context"
 	"fmt"
+	"syscall"
+	"time"
+
 	"github.com/hanwen/go-fuse/v2/fuse"
 	"github.com/seaweedfs/seaweedfs/weed/filer"
 	"github.com/seaweedfs/seaweedfs/weed/glog"
 	"github.com/seaweedfs/seaweedfs/weed/pb/filer_pb"
 	"github.com/seaweedfs/seaweedfs/weed/util"
-	"syscall"
-	"time"
 )
 
 /**
@@ -128,9 +129,6 @@ func (wfs *WFS) doFlush(fh *FileHandle, uid, gid uint32) fuse.Status {
 			if entry.Attributes.Gid == 0 {
 				entry.Attributes.Gid = gid
 			}
-			if entry.Attributes.Crtime == 0 {
-				entry.Attributes.Crtime = time.Now().Unix()
-			}
 			entry.Attributes.Mtime = time.Now().Unix()
 		}
 

weed/mount/weedfs_filehandle.go

@@ -3,19 +3,16 @@ package mount
 import (
 	"github.com/hanwen/go-fuse/v2/fuse"
 	"github.com/seaweedfs/seaweedfs/weed/pb/filer_pb"
-	"time"
+	"github.com/seaweedfs/seaweedfs/weed/util"
 )
 
 func (wfs *WFS) AcquireHandle(inode uint64, flags, uid, gid uint32) (fileHandle *FileHandle, status fuse.Status) {
 	var entry *filer_pb.Entry
-	_, _, entry, status = wfs.maybeReadEntry(inode)
+	var path util.FullPath
+	path, _, entry, status = wfs.maybeReadEntry(inode)
 	if status == fuse.OK {
-		if entry != nil && wfs.option.WriteOnceReadMany {
-			if entry.Attributes.Mtime+10 < time.Now().Unix() {
-				if flags&fuse.O_ANYWRITE != 0 {
-					return nil, fuse.EPERM
-				}
-			}
+		if wfs.wormEnabledForEntry(path, entry) && flags&fuse.O_ANYWRITE != 0 {
+			return nil, fuse.EPERM
 		}
 		// need to AcquireFileHandle again to ensure correct handle counter
 		fileHandle = wfs.fhMap.AcquireFileHandle(wfs, inode, entry)

weed/mount/weedfs_link.go

@@ -25,7 +25,6 @@ When creating a link:
 
 /** Create a hard link to a file */
 func (wfs *WFS) Link(cancel <-chan struct{}, in *fuse.LinkIn, name string, out *fuse.EntryOut) (code fuse.Status) {
-
 	if wfs.IsOverQuota {
 		return fuse.Status(syscall.ENOSPC)
 	}
@@ -49,6 +48,11 @@ func (wfs *WFS) Link(cancel <-chan struct{}, in *fuse.LinkIn, name string, out *
 		return status
 	}
 
+	// hardlink is not allowed in WORM mode
+	if wfs.wormEnabledForEntry(oldEntryPath, oldEntry) {
+		return fuse.EPERM
+	}
+
 	// update old file to hardlink mode
 	if len(oldEntry.HardLinkId) == 0 {
 		oldEntry.HardLinkId = filer.NewHardLinkId()

weed/pb/filer.proto

@@ -442,6 +442,7 @@ message FilerConf {
         string data_node = 11;
         uint32 max_file_name_length = 12;
         bool disable_chunk_deletion = 13;
+        bool worm = 14;
     }
     repeated PathConf locations = 2;
 }

weed/pb/filer_pb/filer.pb.go

@@ -4355,6 +4355,7 @@ type FilerConf_PathConf struct {
 	DataNode             string `protobuf:"bytes,11,opt,name=data_node,json=dataNode,proto3" json:"data_node,omitempty"`
 	MaxFileNameLength    uint32 `protobuf:"varint,12,opt,name=max_file_name_length,json=maxFileNameLength,proto3" json:"max_file_name_length,omitempty"`
 	DisableChunkDeletion bool   `protobuf:"varint,13,opt,name=disable_chunk_deletion,json=disableChunkDeletion,proto3" json:"disable_chunk_deletion,omitempty"`
+	Worm                 bool   `protobuf:"varint,14,opt,name=worm,proto3" json:"worm,omitempty"`
 }
 
 func (x *FilerConf_PathConf) Reset() {
@@ -4480,6 +4481,13 @@ func (x *FilerConf_PathConf) GetDisableChunkDeletion() bool {
 	return false
 }
 
+func (x *FilerConf_PathConf) GetWorm() bool {
+	if x != nil {
+		return x.Worm
+	}
+	return false
+}
+
 var File_filer_proto protoreflect.FileDescriptor
 
 var file_filer_proto_rawDesc = []byte{
@@ -4954,14 +4962,14 @@ var file_filer_proto_rawDesc = []byte{
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@@ -4989,208 +4997,210 @@ var file_filer_proto_rawDesc = []byte{
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+	0x33,
 }
 
 var (

weed/pb/master_pb/master.pb.go

@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.34.1
-// 	protoc        v5.26.1
+// 	protoc-gen-go v1.32.0
+// 	protoc        v4.25.3
 // source: master.proto
 
 package master_pb

weed/pb/master_pb/master_grpc.pb.go

@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go-grpc. DO NOT EDIT.
 // versions:
 // - protoc-gen-go-grpc v1.3.0
-// - protoc             v5.26.1
+// - protoc             v4.25.3
 // source: master.proto
 
 package master_pb

weed/pb/volume_server_pb/volume_server.pb.go

@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.32.0
-// 	protoc        v4.25.4
+// 	protoc        v4.25.3
 // source: volume_server.proto
 
 package volume_server_pb

weed/pb/volume_server_pb/volume_server_grpc.pb.go

@@ -67,7 +67,7 @@ const (
 //
 // For semantics around ctx use and closing/ending streaming RPCs, please refer to https://pkg.go.dev/google.golang.org/grpc/?tab=doc#ClientConn.NewStream.
 type VolumeServerClient interface {
-	// Experts only: takes multiple fid parameters. This function does not propagate deletes to replicas.
+	//Experts only: takes multiple fid parameters. This function does not propagate deletes to replicas.
 	BatchDelete(ctx context.Context, in *BatchDeleteRequest, opts ...grpc.CallOption) (*BatchDeleteResponse, error)
 	VacuumVolumeCheck(ctx context.Context, in *VacuumVolumeCheckRequest, opts ...grpc.CallOption) (*VacuumVolumeCheckResponse, error)
 	VacuumVolumeCompact(ctx context.Context, in *VacuumVolumeCompactRequest, opts ...grpc.CallOption) (VolumeServer_VacuumVolumeCompactClient, error)
@@ -737,7 +737,7 @@ func (c *volumeServerClient) Ping(ctx context.Context, in *PingRequest, opts ...
 // All implementations must embed UnimplementedVolumeServerServer
 // for forward compatibility
 type VolumeServerServer interface {
-	// Experts only: takes multiple fid parameters. This function does not propagate deletes to replicas.
+	//Experts only: takes multiple fid parameters. This function does not propagate deletes to replicas.
 	BatchDelete(context.Context, *BatchDeleteRequest) (*BatchDeleteResponse, error)
 	VacuumVolumeCheck(context.Context, *VacuumVolumeCheckRequest) (*VacuumVolumeCheckResponse, error)
 	VacuumVolumeCompact(*VacuumVolumeCompactRequest, VolumeServer_VacuumVolumeCompactServer) error

weed/server/filer_server_handlers_write.go

@@ -70,7 +70,6 @@ func (fs *FilerServer) assignNewFileInfo(so *operation.StorageOption) (fileId, u
 }
 
 func (fs *FilerServer) PostHandler(w http.ResponseWriter, r *http.Request, contentLength int64) {
-
 	ctx := context.Background()
 
 	destination := r.RequestURI
@@ -197,7 +196,6 @@ func (fs *FilerServer) move(ctx context.Context, w http.ResponseWriter, r *http.
 // curl -X DELETE http://localhost:8888/path/to?recursive=true&ignoreRecursiveError=true
 // curl -X DELETE http://localhost:8888/path/to?recursive=true&skipChunkDeletion=true
 func (fs *FilerServer) DeleteHandler(w http.ResponseWriter, r *http.Request) {
-
 	isRecursive := r.FormValue("recursive") == "true"
 	if !isRecursive && fs.option.recursiveDelete {
 		if r.FormValue("recursive") != "false" {
@@ -212,6 +210,12 @@ func (fs *FilerServer) DeleteHandler(w http.ResponseWriter, r *http.Request) {
 		objectPath = objectPath[0 : len(objectPath)-1]
 	}
 
+	rule := fs.filer.FilerConf.MatchStorageRule(objectPath)
+	if rule.Worm {
+		writeJsonError(w, r, http.StatusForbidden, errors.New("operation not permitted"))
+		return
+	}
+
 	err := fs.filer.DeleteEntryMetaAndData(context.Background(), util.FullPath(objectPath), isRecursive, ignoreRecursiveError, !skipChunkDeletion, false, nil, 0)
 	if err != nil {
 		if err == filer_pb.ErrNotFound {

weed/server/filer_server_handlers_write_autochunk.go

@@ -5,8 +5,6 @@ import (
 	"context"
 	"errors"
 	"fmt"
-	//"github.com/seaweedfs/seaweedfs/weed/s3api"
-	"github.com/seaweedfs/seaweedfs/weed/s3api/s3_constants"
 	"io"
 	"net/http"
 	"os"
@@ -19,6 +17,7 @@ import (
 	"github.com/seaweedfs/seaweedfs/weed/glog"
 	"github.com/seaweedfs/seaweedfs/weed/operation"
 	"github.com/seaweedfs/seaweedfs/weed/pb/filer_pb"
+	"github.com/seaweedfs/seaweedfs/weed/s3api/s3_constants"
 	"github.com/seaweedfs/seaweedfs/weed/storage/needle"
 	"github.com/seaweedfs/seaweedfs/weed/util"
 )
@@ -49,7 +48,9 @@ func (fs *FilerServer) autoChunk(ctx context.Context, w http.ResponseWriter, r *
 		reply, md5bytes, err = fs.doPutAutoChunk(ctx, w, r, chunkSize, contentLength, so)
 	}
 	if err != nil {
-		if strings.HasPrefix(err.Error(), "read input:") || err.Error() == io.ErrUnexpectedEOF.Error() {
+		if err.Error() == "operation not permitted" {
+			writeJsonError(w, r, http.StatusForbidden, err)
+		} else if strings.HasPrefix(err.Error(), "read input:") || err.Error() == io.ErrUnexpectedEOF.Error() {
 			writeJsonError(w, r, util.HttpStatusCancelled, err)
 		} else if strings.HasSuffix(err.Error(), "is a file") || strings.HasSuffix(err.Error(), "already exists") {
 			writeJsonError(w, r, http.StatusConflict, err)
@@ -85,6 +86,10 @@ func (fs *FilerServer) doPostAutoChunk(ctx context.Context, w http.ResponseWrite
 		contentType = ""
 	}
 
+	if err := fs.checkPermissions(ctx, r, fileName); err != nil {
+		return nil, nil, err
+	}
+
 	if so.SaveInside {
 		buf := bufPool.Get().(*bytes.Buffer)
 		buf.Reset()
@@ -121,6 +126,10 @@ func (fs *FilerServer) doPutAutoChunk(ctx context.Context, w http.ResponseWriter
 		contentType = ""
 	}
 
+	if err := fs.checkPermissions(ctx, r, ""); err != nil {
+		return nil, nil, err
+	}
+
 	fileChunks, md5Hash, chunkOffset, err, smallContent := fs.uploadReaderToChunks(w, r, r.Body, chunkSize, fileName, contentType, contentLength, so)
 	if err != nil {
 		return nil, nil, err
@@ -152,6 +161,46 @@ func isS3Request(r *http.Request) bool {
 	return r.Header.Get(s3_constants.AmzAuthType) != "" || r.Header.Get("X-Amz-Date") != ""
 }
 
+func (fs *FilerServer) checkPermissions(ctx context.Context, r *http.Request, fileName string) error {
+	fullPath := fs.fixFilePath(ctx, r, fileName)
+	rule := fs.filer.FilerConf.MatchStorageRule(fullPath)
+	if !rule.Worm {
+		return nil
+	}
+
+	_, err := fs.filer.FindEntry(ctx, util.FullPath(fullPath))
+	if err != nil {
+		if errors.Is(err, filer_pb.ErrNotFound) {
+			return nil
+		}
+
+		return err
+	}
+
+	// you cannot change an existing file in Worm mode
+	return errors.New("operation not permitted")
+}
+
+func (fs *FilerServer) fixFilePath(ctx context.Context, r *http.Request, fileName string) string {
+	// fix the path
+	fullPath := r.URL.Path
+	if strings.HasSuffix(fullPath, "/") {
+		if fileName != "" {
+			fullPath += fileName
+		}
+	} else {
+		if fileName != "" {
+			if possibleDirEntry, findDirErr := fs.filer.FindEntry(ctx, util.FullPath(fullPath)); findDirErr == nil {
+				if possibleDirEntry.IsDirectory() {
+					fullPath += "/" + fileName
+				}
+			}
+		}
+	}
+
+	return fullPath
+}
+
 func (fs *FilerServer) saveMetaData(ctx context.Context, r *http.Request, fileName string, contentType string, so *operation.StorageOption, md5bytes []byte, fileChunks []*filer_pb.FileChunk, chunkOffset int64, content []byte) (filerResult *FilerPostResult, replyerr error) {
 
 	// detect file mode
@@ -166,20 +215,7 @@ func (fs *FilerServer) saveMetaData(ctx context.Context, r *http.Request, fileNa
 	}
 
 	// fix the path
-	path := r.URL.Path
-	if strings.HasSuffix(path, "/") {
-		if fileName != "" {
-			path += fileName
-		}
-	} else {
-		if fileName != "" {
-			if possibleDirEntry, findDirErr := fs.filer.FindEntry(ctx, util.FullPath(path)); findDirErr == nil {
-				if possibleDirEntry.IsDirectory() {
-					path += "/" + fileName
-				}
-			}
-		}
-	}
+	path := fs.fixFilePath(ctx, r, fileName)
 
 	var entry *filer.Entry
 	var newChunks []*filer_pb.FileChunk

weed/shell/command_fs_configure.go

@@ -56,6 +56,7 @@ func (c *commandFsConfigure) Do(args []string, commandEnv *CommandEnv, writer io
 	diskType := fsConfigureCommand.String("disk", "", "[hdd|ssd|<tag>] hard drive or solid state drive or any tag")
 	fsync := fsConfigureCommand.Bool("fsync", false, "fsync for the writes")
 	isReadOnly := fsConfigureCommand.Bool("readOnly", false, "disable writes")
+	worm := fsConfigureCommand.Bool("worm", false, "worm mode, If true, a file can only be changed once, after which it becomes readonly and undeletable, see https://en.wikipedia.org/wiki/Write_once_read_many")
 	maxFileNameLength := fsConfigureCommand.Uint("maxFileNameLength", 0, "file name length limits in bytes for compatibility with Unix-based systems")
 	dataCenter := fsConfigureCommand.String("dataCenter", "", "assign writes to this dataCenter")
 	rack := fsConfigureCommand.String("rack", "", "assign writes to this rack")
@@ -87,6 +88,7 @@ func (c *commandFsConfigure) Do(args []string, commandEnv *CommandEnv, writer io
 			DataCenter:        *dataCenter,
 			Rack:              *rack,
 			DataNode:          *dataNode,
+			Worm:              *worm,
 		}
 
 		// check collection