fuse: sync opcodes and capabilities

This adds opcodes and capabilities from this week's upstream kernel.

As of commit 53db28933 ("fuse: extend init flags"), the init message
has been extended to 104 bytes, with more flags added in a flags2
field.

Prepare for this by allowing _OP_INIT to have short reads.

Tested on Fedora 38 (Linux 6.4.14) and Fedora 34 (Linux 5.11)

Change-Id: I366ecda9e23f1a329134677075ee839674ff4c57

fuse/opcode.go

@@ -62,6 +62,12 @@ const (
 	_OP_LSEEK           = uint32(46) // protocol version 24
 	_OP_COPY_FILE_RANGE = uint32(47) // protocol version 28.
 
+	_OP_SETUPMAPPING  = 48
+	_OP_REMOVEMAPPING = 49
+	_OP_SYNCFS        = 50
+	_OP_TMPFILE       = 51
+	_OP_STATX         = 52
+
 	// The following entries don't have to be compatible across Go-FUSE versions.
 	_OP_NOTIFY_INVAL_ENTRY    = uint32(100)
 	_OP_NOTIFY_INVAL_INODE    = uint32(101)
@@ -692,6 +698,10 @@ func init() {
 		_OP_RENAME2:               "RENAME2",
 		_OP_LSEEK:                 "LSEEK",
 		_OP_COPY_FILE_RANGE:       "COPY_FILE_RANGE",
+		_OP_SETUPMAPPING:          "SETUPMAPPING",
+		_OP_REMOVEMAPPING:         "REMOVEMAPPING",
+		_OP_SYNCFS:                "SYNCFS",
+		_OP_TMPFILE:               "TMPFILE",
 	} {
 		operationHandlers[op].Name = v
 	}

fuse/print.go

@@ -46,6 +46,17 @@ var (
 		CAP_CACHE_SYMLINKS:      "CACHE_SYMLINKS",
 		CAP_NO_OPENDIR_SUPPORT:  "NO_OPENDIR_SUPPORT",
 		CAP_EXPLICIT_INVAL_DATA: "EXPLICIT_INVAL_DATA",
+		CAP_MAP_ALIGNMENT:       "MAP_ALIGNMENT",
+		CAP_SUBMOUNTS:           "SUBMOUNTS",
+		CAP_HANDLE_KILLPRIV_V2:  "HANDLE_KILLPRIV_V2",
+		CAP_SETXATTR_EXT:        "SETXATTR_EXT",
+		CAP_INIT_EXT:            "INIT_EXT",
+		CAP_INIT_RESERVED:       "INIT_RESERVED",
+		CAP_SECURITY_CTX:        "SECURITY_CTX",
+		CAP_HAS_INODE_DAX:       "HAS_INODE_DAX",
+		CAP_CREATE_SUPP_GROUP:   "CREATE_SUPP_GROUP",
+		CAP_HAS_EXPIRE_ONLY:     "HAS_EXPIRE_ONLY",
+		CAP_DIRECT_IO_RELAX:     "DIRECT_IO_RELAX",
 	})
 	releaseFlagNames = newFlagNames(map[int64]string{
 		RELEASE_FLUSH: "FLUSH",
@@ -209,7 +220,7 @@ func (in *OpenOut) string() string {
 func (in *InitIn) string() string {
 	return fmt.Sprintf("{%d.%d Ra %d %s}",
 		in.Major, in.Minor, in.MaxReadAhead,
-		flagString(initFlagNames, int64(in.Flags), ""))
+		flagString(initFlagNames, int64(in.Flags)|(int64(in.Flags2)<<32), ""))
 }
 
 func (o *InitOut) string() string {

fuse/request.go

@@ -181,7 +181,12 @@ func (r *request) parse() {
 		return
 	}
 
-	if len(r.arg) < int(r.handler.InputSize) {
+	inSz := int(r.handler.InputSize)
+	if r.inHeader.Opcode == _OP_INIT && inSz > len(r.arg) {
+		// Minor version 36 extended the size of InitIn struct
+		inSz = len(r.arg)
+	}
+	if len(r.arg) < inSz {
 		log.Printf("Short read for %v: %v", operationName(r.inHeader.Opcode), r.arg)
 		r.status = EIO
 		return
@@ -189,7 +194,7 @@ func (r *request) parse() {
 
 	if r.handler.InputSize > 0 {
 		r.inData = unsafe.Pointer(&r.arg[0])
-		r.arg = r.arg[r.handler.InputSize:]
+		r.arg = r.arg[inSz:]
 	} else {
 		r.arg = r.arg[unsafe.Sizeof(InHeader{}):]
 	}

fuse/types.go

@@ -137,6 +137,7 @@ const ( // SetAttrIn.Valid
 	FATTR_MTIME_NOW    = (1 << 8)
 	FATTR_LOCKOWNER    = (1 << 9)
 	FATTR_CTIME        = (1 << 10)
+	FATTR_KILL_SUIDGID = (1 << 11)
 )
 
 type SetAttrInCommon struct {
@@ -256,6 +257,8 @@ const (
 	FOPEN_NONSEEKABLE            = (1 << 2)
 	FOPEN_CACHE_DIR              = (1 << 3)
 	FOPEN_STREAM                 = (1 << 4)
+	FOPEN_NOFLUSH                = (1 << 5)
+	FOPEN_PARALLEL_DIRECT_WRITES = (1 << 6)
 )
 
 type OpenOut struct {
@@ -299,6 +302,19 @@ const (
 	CAP_CACHE_SYMLINKS      = (1 << 23)
 	CAP_NO_OPENDIR_SUPPORT  = (1 << 24)
 	CAP_EXPLICIT_INVAL_DATA = (1 << 25)
+	CAP_MAP_ALIGNMENT       = (1 << 26)
+	CAP_SUBMOUNTS           = (1 << 27)
+	CAP_HANDLE_KILLPRIV_V2  = (1 << 28)
+	CAP_SETXATTR_EXT        = (1 << 29)
+	CAP_INIT_EXT            = (1 << 30)
+	CAP_INIT_RESERVED       = (1 << 31)
+
+	/* bits 32..63 get shifted down 32 bits into the Flags2 field */
+	CAP_SECURITY_CTX      = (1 << 32)
+	CAP_HAS_INODE_DAX     = (1 << 33)
+	CAP_CREATE_SUPP_GROUP = (1 << 34)
+	CAP_HAS_EXPIRE_ONLY   = (1 << 35)
+	CAP_DIRECT_IO_RELAX   = (1 << 36)
 )
 
 type InitIn struct {
@@ -308,6 +324,8 @@ type InitIn struct {
 	Minor        uint32
 	MaxReadAhead uint32
 	Flags        uint32
+	Flags2       uint32
+	Unused       [11]uint32
 }
 
 type InitOut struct {
@@ -321,7 +339,8 @@ type InitOut struct {
 	TimeGran            uint32
 	MaxPages            uint16
 	Padding             uint16
-	Unused              [8]uint32
+	Flags2              uint32
+	Unused              [7]uint32
 }
 
 type _CuseInitIn struct {
@@ -647,6 +666,7 @@ const (
 const (
 	WRITE_CACHE        = (1 << 0)
 	WRITE_LOCKOWNER    = (1 << 1)
+	WRITE_KILL_SUIDGID = (1 << 2)
 )
 
 type FallocateIn struct {