openwrtv4/package/busybox/patches/480-mount_union.patch

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--- a/util-linux/mount.c
+++ b/util-linux/mount.c
@@ -42,6 +42,10 @@
#define MS_DIRSYNC 128 // Directory modifications are synchronous
#endif
+#ifndef MS_UNION
+#define MS_UNION 0x100 /* 256: Mount on top of a union */
+#endif
+
#if defined(__dietlibc__)
// 16.12.2006, Sampo Kellomaki (sampo@iki.fi)
@@ -152,6 +156,7 @@ static const int32_t mount_options[] = {
/* "rslave" */ MS_SLAVE|MS_RECURSIVE,
/* "rprivate" */ MS_SLAVE|MS_RECURSIVE,
/* "runbindable" */ MS_UNBINDABLE|MS_RECURSIVE,
+ /* "union" */ MS_UNION,
)
// Always understood.
@@ -206,6 +211,7 @@ static const char mount_option_str[] =
"rslave\0"
"rprivate\0"
"runbindable\0"
+ "union" "\0"
)
// Always understood.