From be856b940fb5abb22abe649256bb4283c07c3d85 Mon Sep 17 00:00:00 2001
From: Russ Cox <rsc@swtch.com>
Date: Thu, 18 Mar 2010 18:07:39 -0700
Subject: acme: attempt to fix Put mtime skew on NFS

R=r
http://codereview.appspot.com/583043
---
 src/cmd/acme/exec.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

(limited to 'src')

diff --git a/src/cmd/acme/exec.c b/src/cmd/acme/exec.c
index d24775df..a71b5b48 100644
--- a/src/cmd/acme/exec.c
+++ b/src/cmd/acme/exec.c
@@ -687,6 +687,19 @@ putfile(File *f, int q0, int q1, Rune *namer, int nname)
 			w->dirty = TRUE;
 			f->unread = TRUE;
 		}else{
+			// In case the file is on NFS, reopen the fd
+			// before dirfstat to cause the attribute cache
+			// to be updated (otherwise the mtime in the
+			// dirfstat below will be stale and not match
+			// what NFS sees).  The file is already written,
+			// so this should be a no-op when not on NFS.
+			// Opening for OWRITE (but no truncation)
+			// in case we don't have read permission.
+			// (The create above worked, so we probably
+			// still have write permission.)
+			close(fd);
+			fd = open(name, OWRITE);
+
 			d1 = dirfstat(fd);
 			if(d1 != nil){
 				free(d);
-- 
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