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unix: add MoveMount syscall on linux

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This syscall is not yet described in linux man pages
(https://github.com/mkerrisk/man-pages.git),
but it was submitted to lkml https://lwn.net/Articles/802095/
This syscall appeared in linux v5.2.

Change-Id: I0708bfceda8d7a7608d0d0e75e36c3d81302dedb
Reviewed-on: https://go-review.googlesource.com/c/sys/+/397095
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Auto-Submit: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>
This commit is contained in:
Alexey Perevalov
2022-04-01 15:49:24 +00:00
committed by Gopher Robot
parent 1e041c57c4
commit 289d7a0edf
4 changed files with 37 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
unix/linux/types.go
View File

@@ -905,6 +905,14 @@ const (
OPEN_TREE_CLONE = C.OPEN_TREE_CLONE
OPEN_TREE_CLOEXEC = C.OPEN_TREE_CLOEXEC
MOVE_MOUNT_F_SYMLINKS = C.MOVE_MOUNT_F_SYMLINKS
MOVE_MOUNT_F_AUTOMOUNTS = C.MOVE_MOUNT_F_AUTOMOUNTS
MOVE_MOUNT_F_EMPTY_PATH = C.MOVE_MOUNT_F_EMPTY_PATH
MOVE_MOUNT_T_SYMLINKS = C.MOVE_MOUNT_T_SYMLINKS
MOVE_MOUNT_T_AUTOMOUNTS = C.MOVE_MOUNT_T_AUTOMOUNTS
MOVE_MOUNT_T_EMPTY_PATH = C.MOVE_MOUNT_T_EMPTY_PATH
MOVE_MOUNT_SET_GROUP = C.MOVE_MOUNT_SET_GROUP
)
type OpenHow C.struct_open_how

1
unix/syscall_linux.go
View File

@@ -1859,6 +1859,7 @@ func Getpgrp() (pid int) {
//sys MemfdCreate(name string, flags int) (fd int, err error)
//sys Mkdirat(dirfd int, path string, mode uint32) (err error)
//sys Mknodat(dirfd int, path string, mode uint32, dev int) (err error)
//sys MoveMount(fromDirfd int, fromPathName string, toDirfd int, toPathName string, flags int) (err error)
//sys Nanosleep(time *Timespec, leftover *Timespec) (err error)
//sys OpenTree(dfd int, fileName string, flags uint) (r int, err error)
//sys PerfEventOpen(attr *PerfEventAttr, pid int, cpu int, groupFd int, flags int) (fd int, err error)

20
unix/zsyscall_linux.go
View File

@@ -1205,6 +1205,26 @@ func Mknodat(dirfd int, path string, mode uint32, dev int) (err error) {
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
func MoveMount(fromDirfd int, fromPathName string, toDirfd int, toPathName string, flags int) (err error) {
var _p0 *byte
_p0, err = BytePtrFromString(fromPathName)
if err != nil {
return
}
var _p1 *byte
_p1, err = BytePtrFromString(toPathName)
if err != nil {
return
}
_, _, e1 := Syscall6(SYS_MOVE_MOUNT, uintptr(fromDirfd), uintptr(unsafe.Pointer(_p0)), uintptr(toDirfd), uintptr(unsafe.Pointer(_p1)), uintptr(flags), 0)
if e1 != 0 {
err = errnoErr(e1)
}
return
}
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
func Nanosleep(time *Timespec, leftover *Timespec) (err error) {
_, _, e1 := Syscall(SYS_NANOSLEEP, uintptr(unsafe.Pointer(time)), uintptr(unsafe.Pointer(leftover)), 0)
if e1 != 0 {

8
unix/ztypes_linux.go
View File

@@ -756,6 +756,14 @@ const (
AT_EACCESS = 0x200
OPEN_TREE_CLONE = 0x1
MOVE_MOUNT_F_SYMLINKS = 0x1
MOVE_MOUNT_F_AUTOMOUNTS = 0x2
MOVE_MOUNT_F_EMPTY_PATH = 0x4
MOVE_MOUNT_T_SYMLINKS = 0x10
MOVE_MOUNT_T_AUTOMOUNTS = 0x20
MOVE_MOUNT_T_EMPTY_PATH = 0x40
MOVE_MOUNT_SET_GROUP = 0x100
)
type OpenHow struct {