support write once read many

fix https://github.com/seaweedfs/seaweedfs/issues/5954

weed/command/mount.go

@@ -33,6 +33,7 @@ type MountOptions struct {
 	localSocket        *string
 	disableXAttr       *bool
 	extraOptions       []string
+	writeOnceReadMany  *bool
 }
 
 var (
@@ -70,6 +71,7 @@ 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

@@ -247,6 +247,7 @@ func RunMount(option *MountOptions, umask os.FileMode) bool {
 		Cipher:             cipher,
 		UidGidMapper:       uidGidMapper,
 		DisableXAttr:       *option.disableXAttr,
+		WriteOnceReadMany:  *option.writeOnceReadMany,
 	})
 
 	// create mount root