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Message-Id: <5ddf3d27d79ba6b3c0893099e7fe465d49c05c45.1632156835.git.linux_oss@crudebyte.com>
Date: Mon, 20 Sep 2021 18:44:07 +0200
From: Christian Schoenebeck <linux_oss@...debyte.com>
To: v9fs-developer@...ts.sourceforge.net
Cc: netdev@...r.kernel.org,
Dominique Martinet <asmadeus@...ewreck.org>,
Eric Van Hensbergen <ericvh@...il.com>,
Latchesar Ionkov <lucho@...kov.net>,
Greg Kurz <groug@...d.org>, Vivek Goyal <vgoyal@...hat.com>
Subject: [PATCH v2 5/7] net/9p: add trans_maxsize to struct p9_client
This new field 'trans_maxsize' optionally allows transport to
update it to reflect the actual maximum msize supported by
allocated transport channel.
Signed-off-by: Christian Schoenebeck <linux_oss@...debyte.com>
---
include/net/9p/client.h | 2 ++
net/9p/client.c | 12 ++++++++++--
2 files changed, 12 insertions(+), 2 deletions(-)
diff --git a/include/net/9p/client.h b/include/net/9p/client.h
index e1c308d8d288..e48c4cdf9be0 100644
--- a/include/net/9p/client.h
+++ b/include/net/9p/client.h
@@ -89,6 +89,7 @@ struct p9_req_t {
* struct p9_client - per client instance state
* @lock: protect @fids and @reqs
* @msize: maximum data size negotiated by protocol
+ * @trans_maxsize: actual maximum msize supported by transport channel
* @proto_version: 9P protocol version to use
* @trans_mod: module API instantiated with this client
* @status: connection state
@@ -103,6 +104,7 @@ struct p9_req_t {
struct p9_client {
spinlock_t lock;
unsigned int msize;
+ unsigned int trans_maxsize;
unsigned char proto_version;
struct p9_trans_module *trans_mod;
enum p9_trans_status status;
diff --git a/net/9p/client.c b/net/9p/client.c
index 4f4fd2098a30..a75034fa249b 100644
--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -1037,6 +1037,14 @@ struct p9_client *p9_client_create(const char *dev_name, char *options)
goto free_client;
}
+ /*
+ * transport will get a chance to increase trans_maxsize (if
+ * necessary) and it may update trans_maxsize in create() function
+ * below accordingly to reflect the actual maximum size supported by
+ * the allocated transport channel
+ */
+ clnt->trans_maxsize = clnt->trans_mod->maxsize;
+
p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
@@ -1044,8 +1052,8 @@ struct p9_client *p9_client_create(const char *dev_name, char *options)
if (err)
goto put_trans;
- if (clnt->msize > clnt->trans_mod->maxsize) {
- clnt->msize = clnt->trans_mod->maxsize;
+ if (clnt->msize > clnt->trans_maxsize) {
+ clnt->msize = clnt->trans_maxsize;
pr_info("Limiting 'msize' to %d as this is the maximum "
"supported by transport %s\n",
clnt->msize, clnt->trans_mod->name
--
2.20.1
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