D21606.id64040.diff
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	Index: head/sys/compat/linux/linux_file.h
	===================================================================
	--- head/sys/compat/linux/linux_file.h
	+++ head/sys/compat/linux/linux_file.h
	@@ -127,4 +127,11 @@
	#define LINUX_F_UNLCK 2
	#endif

	+/*
	+ * renameat2 flags
	+ */
	+#define LINUX_RENAME_NOREPLACE 0x00000001
	+#define LINUX_RENAME_EXCHANGE 0x00000002
	+#define LINUX_RENAME_WHITEOUT 0x00000004
	+
	#endif /* !_LINUX_FILE_H_ */
	Index: head/sys/compat/linux/linux_file.c
	===================================================================
	--- head/sys/compat/linux/linux_file.c
	+++ head/sys/compat/linux/linux_file.c
	@@ -704,6 +704,13 @@
	int error, olddfd, newdfd;

	if (args->flags != 0) {
	+ if (args->flags & ~(LINUX_RENAME_EXCHANGE \|
	+ LINUX_RENAME_NOREPLACE \| LINUX_RENAME_WHITEOUT))
	+ return (EINVAL);
	+ if (args->flags & LINUX_RENAME_EXCHANGE &&
	+ args->flags & (LINUX_RENAME_NOREPLACE \|
	+ LINUX_RENAME_WHITEOUT))
	+ return (EINVAL);
	linux_msg(td, "renameat2 unsupported flags 0x%x",
	args->flags);
	return (EINVAL);