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SUNRPC: Add rpc_auth::au_ralign field

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Currently rpc_inline_rcv_pages() uses au_rslack to estimate the
size of the upper layer reply header. This is fine for auth flavors
where au_verfsize == au_rslack.

However, some auth flavors have more going on. krb5i for example has
two more words after the verifier, and another blob following the
RPC message. The calculation involving au_rslack pushes the upper
layer reply header too far into the rcv_buf.

au_rslack is still valuable: it's the amount of buffer space needed
for the reply, and is used when allocating the reply buffer. We'll
keep that.

But, add a new field that can be used to properly estimate the
location of the upper layer header in each RPC reply, based on the
auth flavor in use.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Chuck Lever
2019-02-11 11:25:36 -05:00
committed by Anna Schumaker
parent a00275baa6
commit 35e77d21ba
5 changed files with 20 additions and 11 deletions
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net/sunrpc/clnt.c
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@@ -1180,7 +1180,7 @@ void rpc_prepare_reply_pages(struct rpc_rqst *req, struct page **pages,
/* Subtract one to force an extra word of buffer space for the
* payload's XDR pad to fall into the rcv_buf's tail iovec.
*/
hdrsize += RPC_REPHDRSIZE + req->rq_cred->cr_auth->au_rslack - 1;
hdrsize += RPC_REPHDRSIZE + req->rq_cred->cr_auth->au_ralign - 1;
xdr_inline_pages(&req->rq_rcv_buf, hdrsize << 2, pages, base, len);
trace_rpc_reply_pages(req);