unix: add IoctlLoopConfigure on linux

LOOP_CONFIGURE ioctl is used to setup and configure all loop device
parameters in a single step.

unix/ioctl_linux.go

@@ -231,3 +231,8 @@ func IoctlLoopGetStatus64(fd int) (*LoopInfo64, error) {
 func IoctlLoopSetStatus64(fd int, value *LoopInfo64) error {
 	return ioctlPtr(fd, LOOP_SET_STATUS64, unsafe.Pointer(value))
 }
+
+// IoctlLoopConfigure configures all loop device parameters in a single step
+func IoctlLoopConfigure(fd int, value *LoopConfig) error {
+	return ioctlPtr(fd, LOOP_CONFIGURE, unsafe.Pointer(value))
+}

unix/linux/types.go

@@ -3001,6 +3001,7 @@ const (
 
 type LoopInfo C.struct_loop_info
 type LoopInfo64 C.struct_loop_info64
+type LoopConfig C.struct_loop_config
 
 // AF_TIPC
 

unix/mkerrors.sh

@@ -519,6 +519,7 @@ ccflags="$@"
 		$2 ~ /^LOCK_(SH|EX|NB|UN)$/ ||
 		$2 ~ /^LO_(KEY|NAME)_SIZE$/ ||
 		$2 ~ /^LOOP_(CLR|CTL|GET|SET)_/ ||
+		$2 == "LOOP_CONFIGURE" ||
 		$2 ~ /^(AF|SOCK|SO|SOL|IPPROTO|IP|IPV6|TCP|MCAST|EVFILT|NOTE|SHUT|PROT|MAP|MREMAP|MFD|T?PACKET|MSG|SCM|MCL|DT|MADV|PR|LOCAL|TCPOPT|UDP)_/ ||
 		$2 ~ /^NFC_(GENL|PROTO|COMM|RF|SE|DIRECTION|LLCP|SOCKPROTO)_/ ||
 		$2 ~ /^NFC_.*_(MAX)?SIZE$/ ||

unix/zerrors_linux.go

@@ -1794,6 +1794,7 @@ const (
 	LOCK_SH                                     = 0x1
 	LOCK_UN                                     = 0x8
 	LOOP_CLR_FD                                 = 0x4c01
+	LOOP_CONFIGURE                              = 0x4c0a
 	LOOP_CTL_ADD                                = 0x4c80
 	LOOP_CTL_GET_FREE                           = 0x4c82
 	LOOP_CTL_REMOVE                             = 0x4c81

unix/ztypes_linux.go

@@ -2979,6 +2979,12 @@ type LoopInfo64 struct {
 	Encrypt_key      [32]uint8
 	Init             [2]uint64
 }
+type LoopConfig struct {
+	Fd   uint32
+	Size uint32
+	Info LoopInfo64
+	_    [8]uint64
+}
 
 type TIPCSocketAddr struct {
 	Ref  uint32