add SetAttrMore ioctl

scoutfs.go

@@ -11,6 +11,7 @@ import (
 	"encoding/binary"
 	"math"
 	"os"
+	"time"
 	"unsafe"
 )
 
@@ -165,6 +166,37 @@ func FStatMore(f *os.File) (Stat, error) {
 	return s, nil
 }
 
+// SetAttrMore sets special scoutfs attributes
+func SetAttrMore(path string, version, size, flags uint64, ctime time.Time) error {
+	f, err := os.Open(path)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+
+	return FSetAttrMore(f, version, size, flags, ctime)
+}
+
+// FSetAttrMore sets special scoutfs attributes for file handle
+func FSetAttrMore(f *os.File, version, size, flags uint64, ctime time.Time) error {
+	var nsec int32
+	if ctime.UnixNano() == int64(int32(ctime.UnixNano())) {
+		nsec = int32(ctime.UnixNano())
+	}
+	s := setattrMore{
+		dataVersion: version,
+		iSize:       size,
+		flags:       flags,
+		ctime: scoutfsTimespec{
+			sec:  ctime.Unix(),
+			nsec: nsec,
+		},
+	}
+
+	_, err := scoutfsctl(f.Fd(), IOCSETATTRMORE, uintptr(unsafe.Pointer(&s)))
+	return err
+}
+
 // InoToPath converts an inode number to a path in the filesystem
 // An open file within scoutfs is supplied for ioctls
 // (usually just the base mount point directory)

scoutfsdefs.go

@@ -27,6 +27,8 @@ const (
 	IOCSTATMORE = 0x40307307
 	// IOCDATAWAITING scoutfs ioctl
 	IOCDATAWAITING = 0x40227309
+	// IOCSETATTRMORE scoutfs ioctl
+	IOCSETATTRMORE = 0x4024730a
 
 	// QUERYINODESMETASEQ find inodes by metadata sequence
 	QUERYINODESMETASEQ = '\u0000'
@@ -301,3 +303,37 @@ type dataWaiting struct {
 	entries     uintptr
 	count       uint16
 }
+
+/* pahole for scoutfs_timespec
+struct scoutfs_timespec {
+        __le64                     sec;                  //     0     8
+        __le32                     nsec;                 //     8     4
+
+        // size: 12, cachelines: 1, members: 2
+        // last cacheline: 12 bytes
+};
+*/
+
+type scoutfsTimespec struct {
+	sec  int64
+	nsec int32
+}
+
+/* pahole for scoutfs_ioctl_setattr_more
+struct scoutfs_ioctl_setattr_more {
+	__u64                      data_version;         //     0     8
+	__u64                      i_size;               //     8     8
+	__u64                      flags;                //    16     8
+	struct scoutfs_timespec    ctime;                //    24    12
+
+	// size: 36, cachelines: 1, members: 4
+	// last cacheline: 36 bytes
+};
+*/
+
+type setattrMore struct {
+	dataVersion uint64
+	iSize       uint64
+	flags       uint64
+	ctime       scoutfsTimespec
+}