From 13b15b780d9013988b1fb0e79e30b2528a877638 Mon Sep 17 00:00:00 2001
From: Alexandru Matei <alexandru.matei@uipath.com>
Date: Mon, 6 Nov 2023 13:13:51 +0000
Subject: [PATCH] unix: add IoctlLoopConfigure on linux

LOOP_CONFIGURE ioctl is used to setup and configure all loop device
parameters in a single step.
Add to the unix package a new function that exposes LOOP_CONFIGURE.

Fixes golang/go#63962

Change-Id: Ia169d268b52b1384febc6bff9c707b721ab2bb24
GitHub-Last-Rev: f9cc4c94cb654afd596df6e28a0d0a1bf60d15eb
GitHub-Pull-Request: golang/sys#181
Reviewed-on: https://go-review.googlesource.com/c/sys/+/540075
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>
Auto-Submit: Tobias Klauser <tobias.klauser@gmail.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
---
 unix/ioctl_linux.go   | 5 +++++
 unix/linux/types.go   | 1 +
 unix/mkerrors.sh      | 1 +
 unix/zerrors_linux.go | 1 +
 unix/ztypes_linux.go  | 6 ++++++
 5 files changed, 14 insertions(+)

diff --git a/unix/ioctl_linux.go b/unix/ioctl_linux.go
index 0d12c0851..dbe680eab 100644
--- a/unix/ioctl_linux.go
+++ b/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))
+}
diff --git a/unix/linux/types.go b/unix/linux/types.go
index 47c06ee76..9297fcfaa 100644
--- a/unix/linux/types.go
+++ b/unix/linux/types.go
@@ -3027,6 +3027,7 @@ const (
 
 type LoopInfo C.struct_loop_info
 type LoopInfo64 C.struct_loop_info64
+type LoopConfig C.struct_loop_config
 
 // AF_TIPC
 
diff --git a/unix/mkerrors.sh b/unix/mkerrors.sh
index 5dda44503..6202638ba 100755
--- a/unix/mkerrors.sh
+++ b/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)_/ ||
 		$2 ~ /^NFC_.*_(MAX)?SIZE$/ ||
diff --git a/unix/zerrors_linux.go b/unix/zerrors_linux.go
index 1781cfca3..c73cfe2f1 100644
--- a/unix/zerrors_linux.go
+++ b/unix/zerrors_linux.go
@@ -1801,6 +1801,7 @@ 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
diff --git a/unix/ztypes_linux.go b/unix/ztypes_linux.go
index b07276a1b..bbf8399ff 100644
--- a/unix/ztypes_linux.go
+++ b/unix/ztypes_linux.go
@@ -3005,6 +3005,12 @@ 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