linux-kernel - [PATCH v2 01/10] Adjust maximum MSIZE to account for p9 header

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Date:   Sun, 18 Dec 2022 23:22:09 +0000
From:   Eric Van Hensbergen <evanhensbergen@...oud.com>
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 <evanhensbergen@...oud.com>
Subject: [PATCH v2 01/10] 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 <evanhensbergen@...oud.com>
---
 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 fef6516a0639..f982d36b55b8 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

base-commit: b7b275e60bcd5f89771e865a8239325f86d9927d
prerequisite-patch-id: 031bd397a760838e416ddba75243269ce906c368
prerequisite-patch-id: cf70b974aff8376ea1bbb41d2606ec93609eecf0
prerequisite-patch-id: 91046bd699f2be9a4c9c9bf317693039a4374fbe
prerequisite-patch-id: 28c9dc76bc302670a661fef2c4807d77038ca054
prerequisite-patch-id: 9e6a0ffb4d37f179b3ef3b920d883a464c5c3083
prerequisite-patch-id: f1ef66e1bee57cf76948e8d7d6eca9ef5c335b0e
prerequisite-patch-id: a8342a621d33c26f9347d46c52f076d41d61a946
prerequisite-patch-id: 9117d73d5265a507d68acce493d7f7e623f7a6b0
-- 
2.37.2