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NFSD: Save location of NFSv4 COMPOUND status

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Refactor: Currently nfs4svc_encode_compoundres() relies on the NFS
dispatcher to pass in the buffer location of the COMPOUND status.
Instead, save that buffer location in struct nfsd4_compoundres.

The compound tag follows immediately after.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Chuck Lever 2021-10-13 10:40:59 -04:00 committed by J. Bruce Fields
parent c44b31c263
commit 3b0ebb255f
3 changed files with 10 additions and 4 deletions
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2
fs/nfsd/nfs4proc.c
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@ -2461,11 +2461,11 @@ nfsd4_proc_compound(struct svc_rqst *rqstp)
__be32 status;
resp->xdr = &rqstp->rq_res_stream;
resp->statusp = resp->xdr->p;
/* reserve space for: NFS status code */
xdr_reserve_space(resp->xdr, XDR_UNIT);
resp->tagp = resp->xdr->p;
/* reserve space for: taglen, tag, and opcnt */
xdr_reserve_space(resp->xdr, XDR_UNIT * 2 + args->taglen);
resp->taglen = args->taglen;

9
fs/nfsd/nfs4xdr.c
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@ -5435,11 +5435,16 @@ nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p)
WARN_ON_ONCE(buf->len != buf->head[0].iov_len + buf->page_len +
buf->tail[0].iov_len);
*p = resp->cstate.status;
/*
* Send buffer space for the following items is reserved
* at the top of nfsd4_proc_compound().
*/
p = resp->statusp;
*p++ = resp->cstate.status;
rqstp->rq_next_page = resp->xdr->page_ptr + 1;
p = resp->tagp;
*p++ = htonl(resp->taglen);
memcpy(p, resp->tag, resp->taglen);
p += XDR_QUADLEN(resp->taglen);

3
fs/nfsd/xdr4.h
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@ -702,10 +702,11 @@ struct nfsd4_compoundres {
struct xdr_stream *xdr;
struct svc_rqst * rqstp;
__be32 *statusp;
u32 taglen;
char * tag;
u32 opcnt;
__be32 * tagp; /* tag, opcount encode location */
struct nfsd4_compound_state cstate;
};