unix: add unexported name_to_handle_at and open_by_handle_at types & wrappers

No usable change for users in this CL; just auto-generated syscall
wrapper funcs & types.

The next CL will have hand-written code adding the nice Go API around
these unexported symbols. (as outlined in the comment at
https://golang.org/issue/30537#issuecomment-470284573)

Updates golang/go#30537

Change-Id: I5e34df517efcf509fff97f670425500cc6608d59
Reviewed-on: https://go-review.googlesource.com/c/sys/+/172584
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>

unix/syscall_linux.go

@@ -1662,6 +1662,19 @@ func Faccessat(dirfd int, path string, mode uint32, flags int) (err error) {
 	return EACCES
 }
 
+//sys nameToHandleAt(dirFD int, pathname string, fh *fileHandle, mountID *_C_int, flags int) (err error) = SYS_NAME_TO_HANDLE_AT
+//sys openByHandleAt(mountFD int, fh *fileHandle, flags int) (fd int, err error) = SYS_OPEN_BY_HANDLE_AT
+
+// fileHandle is the argument to nameToHandleAt and openByHandleAt. We
+// originally tried to generate it via unix/linux/types.go with "type
+// fileHandle C.struct_file_handle" but that generated empty structs
+// for mips64 and mips64le. Instead, hard code it for now (it's the
+// same everywhere else) until the mips64 generator issue is fixed.
+type fileHandle struct {
+	Bytes uint32
+	Type  int32
+}
+
 /*
  * Unimplemented
  */

unix/zsyscall_linux_386.go

@@ -1679,6 +1679,32 @@ func faccessat(dirfd int, path string, mode uint32) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func nameToHandleAt(dirFD int, pathname string, fh *fileHandle, mountID *_C_int, flags int) (err error) {
+	var _p0 *byte
+	_p0, err = BytePtrFromString(pathname)
+	if err != nil {
+		return
+	}
+	_, _, e1 := Syscall6(SYS_NAME_TO_HANDLE_AT, uintptr(dirFD), uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(fh)), uintptr(unsafe.Pointer(mountID)), uintptr(flags), 0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func openByHandleAt(mountFD int, fh *fileHandle, flags int) (fd int, err error) {
+	r0, _, e1 := Syscall(SYS_OPEN_BY_HANDLE_AT, uintptr(mountFD), uintptr(unsafe.Pointer(fh)), uintptr(flags))
+	fd = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func pipe(p *[2]_C_int) (err error) {
 	_, _, e1 := RawSyscall(SYS_PIPE, uintptr(unsafe.Pointer(p)), 0, 0)
 	if e1 != 0 {

unix/zsyscall_linux_amd64.go

@@ -1679,6 +1679,32 @@ func faccessat(dirfd int, path string, mode uint32) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func nameToHandleAt(dirFD int, pathname string, fh *fileHandle, mountID *_C_int, flags int) (err error) {
+	var _p0 *byte
+	_p0, err = BytePtrFromString(pathname)
+	if err != nil {
+		return
+	}
+	_, _, e1 := Syscall6(SYS_NAME_TO_HANDLE_AT, uintptr(dirFD), uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(fh)), uintptr(unsafe.Pointer(mountID)), uintptr(flags), 0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func openByHandleAt(mountFD int, fh *fileHandle, flags int) (fd int, err error) {
+	r0, _, e1 := Syscall(SYS_OPEN_BY_HANDLE_AT, uintptr(mountFD), uintptr(unsafe.Pointer(fh)), uintptr(flags))
+	fd = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func Dup2(oldfd int, newfd int) (err error) {
 	_, _, e1 := Syscall(SYS_DUP2, uintptr(oldfd), uintptr(newfd), 0)
 	if e1 != 0 {

unix/zsyscall_linux_arm.go

@@ -1679,6 +1679,32 @@ func faccessat(dirfd int, path string, mode uint32) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func nameToHandleAt(dirFD int, pathname string, fh *fileHandle, mountID *_C_int, flags int) (err error) {
+	var _p0 *byte
+	_p0, err = BytePtrFromString(pathname)
+	if err != nil {
+		return
+	}
+	_, _, e1 := Syscall6(SYS_NAME_TO_HANDLE_AT, uintptr(dirFD), uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(fh)), uintptr(unsafe.Pointer(mountID)), uintptr(flags), 0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func openByHandleAt(mountFD int, fh *fileHandle, flags int) (fd int, err error) {
+	r0, _, e1 := Syscall(SYS_OPEN_BY_HANDLE_AT, uintptr(mountFD), uintptr(unsafe.Pointer(fh)), uintptr(flags))
+	fd = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func pipe(p *[2]_C_int) (err error) {
 	_, _, e1 := RawSyscall(SYS_PIPE, uintptr(unsafe.Pointer(p)), 0, 0)
 	if e1 != 0 {

unix/zsyscall_linux_arm64.go

@@ -1679,6 +1679,32 @@ func faccessat(dirfd int, path string, mode uint32) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func nameToHandleAt(dirFD int, pathname string, fh *fileHandle, mountID *_C_int, flags int) (err error) {
+	var _p0 *byte
+	_p0, err = BytePtrFromString(pathname)
+	if err != nil {
+		return
+	}
+	_, _, e1 := Syscall6(SYS_NAME_TO_HANDLE_AT, uintptr(dirFD), uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(fh)), uintptr(unsafe.Pointer(mountID)), uintptr(flags), 0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func openByHandleAt(mountFD int, fh *fileHandle, flags int) (fd int, err error) {
+	r0, _, e1 := Syscall(SYS_OPEN_BY_HANDLE_AT, uintptr(mountFD), uintptr(unsafe.Pointer(fh)), uintptr(flags))
+	fd = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func EpollWait(epfd int, events []EpollEvent, msec int) (n int, err error) {
 	var _p0 unsafe.Pointer
 	if len(events) > 0 {

unix/zsyscall_linux_mips.go

@@ -1679,6 +1679,32 @@ func faccessat(dirfd int, path string, mode uint32) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func nameToHandleAt(dirFD int, pathname string, fh *fileHandle, mountID *_C_int, flags int) (err error) {
+	var _p0 *byte
+	_p0, err = BytePtrFromString(pathname)
+	if err != nil {
+		return
+	}
+	_, _, e1 := Syscall6(SYS_NAME_TO_HANDLE_AT, uintptr(dirFD), uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(fh)), uintptr(unsafe.Pointer(mountID)), uintptr(flags), 0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func openByHandleAt(mountFD int, fh *fileHandle, flags int) (fd int, err error) {
+	r0, _, e1 := Syscall(SYS_OPEN_BY_HANDLE_AT, uintptr(mountFD), uintptr(unsafe.Pointer(fh)), uintptr(flags))
+	fd = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func Dup2(oldfd int, newfd int) (err error) {
 	_, _, e1 := Syscall(SYS_DUP2, uintptr(oldfd), uintptr(newfd), 0)
 	if e1 != 0 {

unix/zsyscall_linux_mips64.go

@@ -1679,6 +1679,32 @@ func faccessat(dirfd int, path string, mode uint32) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func nameToHandleAt(dirFD int, pathname string, fh *fileHandle, mountID *_C_int, flags int) (err error) {
+	var _p0 *byte
+	_p0, err = BytePtrFromString(pathname)
+	if err != nil {
+		return
+	}
+	_, _, e1 := Syscall6(SYS_NAME_TO_HANDLE_AT, uintptr(dirFD), uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(fh)), uintptr(unsafe.Pointer(mountID)), uintptr(flags), 0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func openByHandleAt(mountFD int, fh *fileHandle, flags int) (fd int, err error) {
+	r0, _, e1 := Syscall(SYS_OPEN_BY_HANDLE_AT, uintptr(mountFD), uintptr(unsafe.Pointer(fh)), uintptr(flags))
+	fd = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func Dup2(oldfd int, newfd int) (err error) {
 	_, _, e1 := Syscall(SYS_DUP2, uintptr(oldfd), uintptr(newfd), 0)
 	if e1 != 0 {

unix/zsyscall_linux_mips64le.go

@@ -1679,6 +1679,32 @@ func faccessat(dirfd int, path string, mode uint32) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func nameToHandleAt(dirFD int, pathname string, fh *fileHandle, mountID *_C_int, flags int) (err error) {
+	var _p0 *byte
+	_p0, err = BytePtrFromString(pathname)
+	if err != nil {
+		return
+	}
+	_, _, e1 := Syscall6(SYS_NAME_TO_HANDLE_AT, uintptr(dirFD), uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(fh)), uintptr(unsafe.Pointer(mountID)), uintptr(flags), 0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func openByHandleAt(mountFD int, fh *fileHandle, flags int) (fd int, err error) {
+	r0, _, e1 := Syscall(SYS_OPEN_BY_HANDLE_AT, uintptr(mountFD), uintptr(unsafe.Pointer(fh)), uintptr(flags))
+	fd = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func Dup2(oldfd int, newfd int) (err error) {
 	_, _, e1 := Syscall(SYS_DUP2, uintptr(oldfd), uintptr(newfd), 0)
 	if e1 != 0 {

unix/zsyscall_linux_mipsle.go

@@ -1679,6 +1679,32 @@ func faccessat(dirfd int, path string, mode uint32) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func nameToHandleAt(dirFD int, pathname string, fh *fileHandle, mountID *_C_int, flags int) (err error) {
+	var _p0 *byte
+	_p0, err = BytePtrFromString(pathname)
+	if err != nil {
+		return
+	}
+	_, _, e1 := Syscall6(SYS_NAME_TO_HANDLE_AT, uintptr(dirFD), uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(fh)), uintptr(unsafe.Pointer(mountID)), uintptr(flags), 0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func openByHandleAt(mountFD int, fh *fileHandle, flags int) (fd int, err error) {
+	r0, _, e1 := Syscall(SYS_OPEN_BY_HANDLE_AT, uintptr(mountFD), uintptr(unsafe.Pointer(fh)), uintptr(flags))
+	fd = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func Dup2(oldfd int, newfd int) (err error) {
 	_, _, e1 := Syscall(SYS_DUP2, uintptr(oldfd), uintptr(newfd), 0)
 	if e1 != 0 {

unix/zsyscall_linux_ppc64.go

@@ -1679,6 +1679,32 @@ func faccessat(dirfd int, path string, mode uint32) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func nameToHandleAt(dirFD int, pathname string, fh *fileHandle, mountID *_C_int, flags int) (err error) {
+	var _p0 *byte
+	_p0, err = BytePtrFromString(pathname)
+	if err != nil {
+		return
+	}
+	_, _, e1 := Syscall6(SYS_NAME_TO_HANDLE_AT, uintptr(dirFD), uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(fh)), uintptr(unsafe.Pointer(mountID)), uintptr(flags), 0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func openByHandleAt(mountFD int, fh *fileHandle, flags int) (fd int, err error) {
+	r0, _, e1 := Syscall(SYS_OPEN_BY_HANDLE_AT, uintptr(mountFD), uintptr(unsafe.Pointer(fh)), uintptr(flags))
+	fd = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func Dup2(oldfd int, newfd int) (err error) {
 	_, _, e1 := Syscall(SYS_DUP2, uintptr(oldfd), uintptr(newfd), 0)
 	if e1 != 0 {

unix/zsyscall_linux_ppc64le.go

@@ -1679,6 +1679,32 @@ func faccessat(dirfd int, path string, mode uint32) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func nameToHandleAt(dirFD int, pathname string, fh *fileHandle, mountID *_C_int, flags int) (err error) {
+	var _p0 *byte
+	_p0, err = BytePtrFromString(pathname)
+	if err != nil {
+		return
+	}
+	_, _, e1 := Syscall6(SYS_NAME_TO_HANDLE_AT, uintptr(dirFD), uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(fh)), uintptr(unsafe.Pointer(mountID)), uintptr(flags), 0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func openByHandleAt(mountFD int, fh *fileHandle, flags int) (fd int, err error) {
+	r0, _, e1 := Syscall(SYS_OPEN_BY_HANDLE_AT, uintptr(mountFD), uintptr(unsafe.Pointer(fh)), uintptr(flags))
+	fd = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func Dup2(oldfd int, newfd int) (err error) {
 	_, _, e1 := Syscall(SYS_DUP2, uintptr(oldfd), uintptr(newfd), 0)
 	if e1 != 0 {

unix/zsyscall_linux_riscv64.go

@@ -1679,6 +1679,32 @@ func faccessat(dirfd int, path string, mode uint32) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func nameToHandleAt(dirFD int, pathname string, fh *fileHandle, mountID *_C_int, flags int) (err error) {
+	var _p0 *byte
+	_p0, err = BytePtrFromString(pathname)
+	if err != nil {
+		return
+	}
+	_, _, e1 := Syscall6(SYS_NAME_TO_HANDLE_AT, uintptr(dirFD), uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(fh)), uintptr(unsafe.Pointer(mountID)), uintptr(flags), 0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func openByHandleAt(mountFD int, fh *fileHandle, flags int) (fd int, err error) {
+	r0, _, e1 := Syscall(SYS_OPEN_BY_HANDLE_AT, uintptr(mountFD), uintptr(unsafe.Pointer(fh)), uintptr(flags))
+	fd = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func EpollWait(epfd int, events []EpollEvent, msec int) (n int, err error) {
 	var _p0 unsafe.Pointer
 	if len(events) > 0 {

unix/zsyscall_linux_s390x.go

@@ -1679,6 +1679,32 @@ func faccessat(dirfd int, path string, mode uint32) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func nameToHandleAt(dirFD int, pathname string, fh *fileHandle, mountID *_C_int, flags int) (err error) {
+	var _p0 *byte
+	_p0, err = BytePtrFromString(pathname)
+	if err != nil {
+		return
+	}
+	_, _, e1 := Syscall6(SYS_NAME_TO_HANDLE_AT, uintptr(dirFD), uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(fh)), uintptr(unsafe.Pointer(mountID)), uintptr(flags), 0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func openByHandleAt(mountFD int, fh *fileHandle, flags int) (fd int, err error) {
+	r0, _, e1 := Syscall(SYS_OPEN_BY_HANDLE_AT, uintptr(mountFD), uintptr(unsafe.Pointer(fh)), uintptr(flags))
+	fd = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func Dup2(oldfd int, newfd int) (err error) {
 	_, _, e1 := Syscall(SYS_DUP2, uintptr(oldfd), uintptr(newfd), 0)
 	if e1 != 0 {

unix/zsyscall_linux_sparc64.go

@@ -1679,6 +1679,32 @@ func faccessat(dirfd int, path string, mode uint32) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func nameToHandleAt(dirFD int, pathname string, fh *fileHandle, mountID *_C_int, flags int) (err error) {
+	var _p0 *byte
+	_p0, err = BytePtrFromString(pathname)
+	if err != nil {
+		return
+	}
+	_, _, e1 := Syscall6(SYS_NAME_TO_HANDLE_AT, uintptr(dirFD), uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(fh)), uintptr(unsafe.Pointer(mountID)), uintptr(flags), 0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func openByHandleAt(mountFD int, fh *fileHandle, flags int) (fd int, err error) {
+	r0, _, e1 := Syscall(SYS_OPEN_BY_HANDLE_AT, uintptr(mountFD), uintptr(unsafe.Pointer(fh)), uintptr(flags))
+	fd = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func EpollWait(epfd int, events []EpollEvent, msec int) (n int, err error) {
 	var _p0 unsafe.Pointer
 	if len(events) > 0 {