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

Eric Van Hensbergen
2023-02-18T00:49:01Z

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>
---
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