linux-kernel - [PATCH v4 01/11] net/9p: Adjust maximum MSIZE to account for p9 header

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Date:   Sat, 18 Feb 2023 00:33:13 +0000
From:   Eric Van Hensbergen <ericvh@...nel.org>
To:     v9fs-developer@...ts.sourceforge.net, asmadeus@...ewreck.org,
        rminnich@...il.com, lucho@...kov.net
Cc:     linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux_oss@...debyte.com, Eric Van Hensbergen <ericvh@...nel.org>
Subject: [PATCH v4 01/11] 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@...nel.org>
---
 net/9p/client.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/net/9p/client.c b/net/9p/client.c
index 622ec6a586ee..6c2a768a6ab1 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
-- 
2.37.2