Module Name: src
Committed By: ozaki-r
Date: Wed Mar 2 04:11:41 UTC 2022
Modified Files:
src/usr.sbin/puffs/mount_9p: node.c
Log Message:
mount_9p: fix writing to a file opened with write-only mode
With the page cache, writing data to a file may demand to read contents
from a storage to fill a page in the page cache first.
Opening a file with write-only mode by a user lets a mount_9p process
open a file with write-only mode too at a 9p server. Thus, a read
request to the file from the page cache fails.
So we need to open a file always with read mode (internally) even if it
is opened with write-only mode by a user.
Note that the change doesn't mean that mount_9p allows users to read
contents from a file that is opened with write-only mode.
To generate a diff of this commit:
cvs rdiff -u -r1.29 -r1.30 src/usr.sbin/puffs/mount_9p/node.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/usr.sbin/puffs/mount_9p/node.c
diff -u src/usr.sbin/puffs/mount_9p/node.c:1.29 src/usr.sbin/puffs/mount_9p/node.c:1.30
--- src/usr.sbin/puffs/mount_9p/node.c:1.29 Mon Jun 1 13:30:52 2020
+++ src/usr.sbin/puffs/mount_9p/node.c Wed Mar 2 04:11:41 2022
@@ -1,4 +1,4 @@
-/* $NetBSD: node.c,v 1.29 2020/06/01 13:30:52 uwe Exp $ */
+/* $NetBSD: node.c,v 1.30 2022/03/02 04:11:41 ozaki-r Exp $ */
/*
* Copyright (c) 2007 Antti Kantee. All Rights Reserved.
@@ -27,7 +27,7 @@
#include <sys/cdefs.h>
#ifndef lint
-__RCSID("$NetBSD: node.c,v 1.29 2020/06/01 13:30:52 uwe Exp $");
+__RCSID("$NetBSD: node.c,v 1.30 2022/03/02 04:11:41 ozaki-r Exp $");
#endif /* !lint */
#include <assert.h>
@@ -274,6 +274,8 @@ puffs9p_node_open(struct puffs_usermount
puffs_setback(pcc, PUFFS_SETBACK_INACT_N1);
if (pn->pn_va.va_type != VDIR) {
+ /* Always require read access for page cache */
+ mode |= FREAD;
if (mode & FREAD && p9n->fid_read == P9P_INVALFID) {
nfid = NEXTFID(p9p);
error = proto_cc_open(pu, p9n->fid_base, nfid,
