syscall: define bind flags on Plan 9

These bind flags were removed by mistake in CL 2167.

Fixes #17921.

Change-Id: I1e8089dade30a212b8db0b216c8299946d924d4b
Reviewed-on: https://go-review.googlesource.com/33271
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

diff --git a/src/syscall/const_plan9.go b/src/syscall/const_plan9.go
index ba26f123dea868fe6a94dfbb059389903bb531a9..063d5dfd7c274cff58532c25ad5ac8c81124bc0e 100644 (file)
--- a/src/syscall/const_plan9.go
+++ b/src/syscall/const_plan9.go
@@ -12,6 +12,17 @@ const (
        O_EXCL    = 0x1000
 )
 
+// Bind flags
+const (
+       MORDER  = 0x0003 // mask for bits defining order of mounting
+       MREPL   = 0x0000 // mount replaces object
+       MBEFORE = 0x0001 // mount goes before others in union directory
+       MAFTER  = 0x0002 // mount goes after others in union directory
+       MCREATE = 0x0004 // permit creation in mounted directory
+       MCACHE  = 0x0010 // cache some data
+       MMASK   = 0x0017 // all bits on
+)
+
 // Rfork flags
 const (
        RFNAMEG  = 1 << 0