From: Eric Van Hensbergen <ericvh@kernel.org>
Date: Mon, 28 Nov 2022 00:38:36 +0000 (+0000)
Subject: net/9p: Adjust maximum MSIZE to account for p9 header
X-Git-Tag: v6.6.7~3373^2~6
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=2a03472262c05f965d7ba394ed35dc9867ba3095;p=platform%2Fkernel%2Flinux-starfive.git

net/9p: Adjust maximum MSIZE to account for p9 header

Add maximum p9 header size to MSIZE to make sure we can
have page aligned data.

Signed-off-by: Eric Van Hensbergen <ericvh@kernel.org>
Reviewed-by: Dominique Martinet <asmadeus@codewreck.org>
---

diff --git a/net/9p/client.c b/net/9p/client.c
index 622ec6a..6c2a768 100644
--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -28,7 +28,11 @@
 #define CREATE_TRACE_POINTS
 #include <trace/events/9p.h>
 
-#define DEFAULT_MSIZE (128 * 1024)
+/* DEFAULT MSIZE = 32 pages worth of payload + P9_HDRSZ +
+ * room for write (16 extra) or read (11 extra) operands.
+ */
+
+#define DEFAULT_MSIZE ((128 * 1024) + P9_IOHDRSZ)
 
 /* Client Option Parsing (code inspired by NFS code)
  *  - a little lazy - parse all client options