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net/9p: distinguish zero-copy requests 

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.

Link: https://lkml.kernel.org/r/8f2a5c12a446c3b544da64e0b1550e1fb2d6f972.1669144861.git.linux_oss@crudebyte.com
Signed-off-by: Christian Schoenebeck <linux_oss@crudebyte.com>
Tested-by: Stefano Stabellini <sstabellini@kernel.org>
Signed-off-by: Dominique Martinet <asmadeus@codewreck.org>
This commit is contained in:
Christian Schoenebeck 2022-11-22 20:20:22 +01:00 committed by Dominique Martinet
parent f15e006b83
commit 8e4c2eee1e
2 changed files with 8 additions and 0 deletions
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2
include/net/9p/9p.h
View File

@ -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);

6
net/9p/client.c
View File

@ -685,6 +685,9 @@ 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);
@ -783,6 +786,9 @@ 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);