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>
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2 changed files with 8 additions and 0 deletions
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@ -531,6 +531,7 @@ struct p9_rstatfs {
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* @offset: used by marshalling routines to track current position in buffer
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* @capacity: used by marshalling routines to track total malloc'd capacity
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* @sdata: payload
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* @zc: whether zero-copy is used
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*
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* &p9_fcall represents the structure for all 9P RPC
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* transactions. Requests are packaged into fcalls, and reponses
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@ -549,6 +550,7 @@ struct p9_fcall {
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struct kmem_cache *cache;
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u8 *sdata;
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bool zc;
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};
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int p9_errstr2errno(char *errstr, int len);
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@ -685,6 +685,9 @@ p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
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if (IS_ERR(req))
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return req;
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req->tc.zc = false;
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req->rc.zc = false;
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if (signal_pending(current)) {
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sigpending = 1;
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clear_thread_flag(TIF_SIGPENDING);
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@ -783,6 +786,9 @@ static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type,
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if (IS_ERR(req))
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return req;
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req->tc.zc = true;
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req->rc.zc = true;
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if (signal_pending(current)) {
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sigpending = 1;
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clear_thread_flag(TIF_SIGPENDING);
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