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>

7 files changed, 147 insertions, 17 deletions

diff --git a/weed/mount/filer_conf.go b/weed/mount/filer_conf.go
new file mode 100644
index 000000000..a08d766e8
--- /dev/null
+++ b/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
+}
diff --git a/weed/mount/weedfs.go b/weed/mount/weedfs.go
index 6a1081113..4f029bba8 100644
--- a/weed/mount/weedfs.go
+++ b/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 {
diff --git a/weed/mount/weedfs_file_io.go b/weed/mount/weedfs_file_io.go
index c6fcb8a14..50a5c7c85 100644
--- a/weed/mount/weedfs_file_io.go
+++ b/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
diff --git a/weed/mount/weedfs_file_mkrm.go b/weed/mount/weedfs_file_mkrm.go
index 2da316a50..01d3af476 100644
--- a/weed/mount/weedfs_file_mkrm.go
+++ b/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
diff --git a/weed/mount/weedfs_file_sync.go b/weed/mount/weedfs_file_sync.go
index d857606bd..11ce1d3c4 100644
--- a/weed/mount/weedfs_file_sync.go
+++ b/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()
 		}
 
diff --git a/weed/mount/weedfs_filehandle.go b/weed/mount/weedfs_filehandle.go
index e0149aee9..bfc129240 100644
--- a/weed/mount/weedfs_filehandle.go
+++ b/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)
diff --git a/weed/mount/weedfs_link.go b/weed/mount/weedfs_link.go
index 15b7e081e..28466bdfb 100644
--- a/weed/mount/weedfs_link.go
+++ b/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()