Add boolean `zc` member to struct p9_fcall to distinguish zero-copy
messages (not using the linear `sdata` buffer for message payload) from
regular messages (which do copy message payload to `sdata` before being
further processed).
This new member is appended to end of structure to avoid inserting huge
padding in generated layout.
Signed-off-by: Christian Schoenebeck <[email protected]>
Tested-by: Stefano Stabellini <[email protected]>
---
include/net/9p/9p.h | 2 ++
net/9p/client.c | 6 ++++++
2 files changed, 8 insertions(+)
diff --git a/include/net/9p/9p.h b/include/net/9p/9p.h
index 13abe013af21..429adf6be29c 100644
--- a/include/net/9p/9p.h
+++ b/include/net/9p/9p.h
@@ -531,6 +531,7 @@ struct p9_rstatfs {
* @offset: used by marshalling routines to track current position in buffer
* @capacity: used by marshalling routines to track total malloc'd capacity
* @sdata: payload
+ * @zc: whether zero-copy is used
*
* &p9_fcall represents the structure for all 9P RPC
* transactions. Requests are packaged into fcalls, and reponses
@@ -549,6 +550,7 @@ struct p9_fcall {
struct kmem_cache *cache;
u8 *sdata;
+ bool zc;
};
int p9_errstr2errno(char *errstr, int len);
diff --git a/net/9p/client.c b/net/9p/client.c
index aaa37b07e30a..c7935e392812 100644
--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -680,6 +680,9 @@ p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
if (IS_ERR(req))
return req;
+ req->tc.zc = false;
+ req->rc.zc = false;
+
if (signal_pending(current)) {
sigpending = 1;
clear_thread_flag(TIF_SIGPENDING);
@@ -778,6 +781,9 @@ static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type,
if (IS_ERR(req))
return req;
+ req->tc.zc = true;
+ req->rc.zc = true;
+
if (signal_pending(current)) {
sigpending = 1;
clear_thread_flag(TIF_SIGPENDING);
--
2.30.2