From e465991ea6c7d2b9f52cabf398b9b087a0b25427 Mon Sep 17 00:00:00 2001
From: Russ Cox <rsc@swtch.com>
Date: Tue, 30 Dec 2008 14:27:30 -0800
Subject: 9pfuse: allow O_APPEND in open and create (Roman Shaposhnik)

---
 src/cmd/9pfuse/main.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

(limited to 'src/cmd/9pfuse')

diff --git a/src/cmd/9pfuse/main.c b/src/cmd/9pfuse/main.c
index 45041e66..c3b4a52f 100644
--- a/src/cmd/9pfuse/main.c
+++ b/src/cmd/9pfuse/main.c
@@ -577,6 +577,13 @@ _fuseopen(FuseMsg *m, int isdir)
 	openmode = flags&3;
 	flags &= ~3;
 	flags &= ~(O_DIRECTORY|O_NONBLOCK|O_LARGEFILE|O_CLOEXEC);
+	/*
+	 * Discarding O_APPEND here is not completely wrong,
+	 * because the host kernel will rewrite the offsets
+	 * of write system calls for us.  That's the best we
+	 * can do on Unix anyway.
+	 */
+	flags &= ~O_APPEND;
 	if(flags & O_TRUNC){
 		openmode |= OTRUNC;
 		flags &= ~O_TRUNC;
@@ -585,7 +592,6 @@ _fuseopen(FuseMsg *m, int isdir)
 	 * Could translate but not standard 9P:
 	 *	O_DIRECT -> ODIRECT
 	 *	O_NONBLOCK -> ONONBLOCK
-	 *	O_APPEND -> OAPPEND
 	 */
 	if(flags){
 		fprint(2, "unexpected open flags %#uo", (uint)in->flags);
@@ -702,6 +708,7 @@ fusecreate(FuseMsg *m)
 	openmode = in->flags&3;
 	flags &= ~3;
 	flags &= ~(O_DIRECTORY|O_NONBLOCK|O_LARGEFILE);
+	flags &= ~O_APPEND;	/* see comment in _fuseopen */
 	flags &= ~(O_CREAT|O_TRUNC);	/* huh? */
 	if(flags){
 		fprint(2, "bad mode %#uo\n", in->flags);
-- 
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