From cc028a10a48c3c555d7772d02f56eea9f86fdf79 Mon Sep 17 00:00:00 2001 From: Chuck Lever Date: Fri, 2 Oct 2020 15:52:44 -0400 Subject: NFSD: Hoist status code encoding into XDR encoder functions The original intent was presumably to reduce code duplication. The trade-off was: - No support for an NFSD proc function returning a non-success RPC accept_stat value. - No support for void NFS replies to non-NULL procedures. - Everyone pays for the deduplication with a few extra conditional branches in a hot path. In addition, nfsd_dispatch() leaves *statp uninitialized in the success path, unlike svc_generic_dispatch(). Address all of these problems by moving the logic for encoding the NFS status code into the NFS XDR encoders themselves. Then update the NFS .pc_func methods to return an RPC accept_stat value. Signed-off-by: Chuck Lever Signed-off-by: J. Bruce Fields --- fs/nfsd/nfs3xdr.c | 19 +++++++++++++++---- 1 file changed, 15 insertions(+), 4 deletions(-) (limited to 'fs/nfsd/nfs3xdr.c') diff --git a/fs/nfsd/nfs3xdr.c b/fs/nfsd/nfs3xdr.c index e540fd1a29d8..9c23b6acf234 100644 --- a/fs/nfsd/nfs3xdr.c +++ b/fs/nfsd/nfs3xdr.c @@ -641,10 +641,7 @@ nfs3svc_decode_commitargs(struct svc_rqst *rqstp, __be32 *p) /* * XDR encode functions */ -/* - * There must be an encoding function for void results so svc_process - * will work properly. - */ + int nfs3svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p) { @@ -657,6 +654,7 @@ nfs3svc_encode_attrstat(struct svc_rqst *rqstp, __be32 *p) { struct nfsd3_attrstat *resp = rqstp->rq_resp; + *p++ = resp->status; if (resp->status == 0) { lease_get_mtime(d_inode(resp->fh.fh_dentry), &resp->stat.mtime); @@ -671,6 +669,7 @@ nfs3svc_encode_wccstat(struct svc_rqst *rqstp, __be32 *p) { struct nfsd3_attrstat *resp = rqstp->rq_resp; + *p++ = resp->status; p = encode_wcc_data(rqstp, p, &resp->fh); return xdr_ressize_check(rqstp, p); } @@ -681,6 +680,7 @@ nfs3svc_encode_diropres(struct svc_rqst *rqstp, __be32 *p) { struct nfsd3_diropres *resp = rqstp->rq_resp; + *p++ = resp->status; if (resp->status == 0) { p = encode_fh(p, &resp->fh); p = encode_post_op_attr(rqstp, p, &resp->fh); @@ -695,6 +695,7 @@ nfs3svc_encode_accessres(struct svc_rqst *rqstp, __be32 *p) { struct nfsd3_accessres *resp = rqstp->rq_resp; + *p++ = resp->status; p = encode_post_op_attr(rqstp, p, &resp->fh); if (resp->status == 0) *p++ = htonl(resp->access); @@ -707,6 +708,7 @@ nfs3svc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p) { struct nfsd3_readlinkres *resp = rqstp->rq_resp; + *p++ = resp->status; p = encode_post_op_attr(rqstp, p, &resp->fh); if (resp->status == 0) { *p++ = htonl(resp->len); @@ -729,6 +731,7 @@ nfs3svc_encode_readres(struct svc_rqst *rqstp, __be32 *p) { struct nfsd3_readres *resp = rqstp->rq_resp; + *p++ = resp->status; p = encode_post_op_attr(rqstp, p, &resp->fh); if (resp->status == 0) { *p++ = htonl(resp->count); @@ -754,6 +757,7 @@ nfs3svc_encode_writeres(struct svc_rqst *rqstp, __be32 *p) { struct nfsd3_writeres *resp = rqstp->rq_resp; + *p++ = resp->status; p = encode_wcc_data(rqstp, p, &resp->fh); if (resp->status == 0) { *p++ = htonl(resp->count); @@ -770,6 +774,7 @@ nfs3svc_encode_createres(struct svc_rqst *rqstp, __be32 *p) { struct nfsd3_diropres *resp = rqstp->rq_resp; + *p++ = resp->status; if (resp->status == 0) { *p++ = xdr_one; p = encode_fh(p, &resp->fh); @@ -785,6 +790,7 @@ nfs3svc_encode_renameres(struct svc_rqst *rqstp, __be32 *p) { struct nfsd3_renameres *resp = rqstp->rq_resp; + *p++ = resp->status; p = encode_wcc_data(rqstp, p, &resp->ffh); p = encode_wcc_data(rqstp, p, &resp->tfh); return xdr_ressize_check(rqstp, p); @@ -796,6 +802,7 @@ nfs3svc_encode_linkres(struct svc_rqst *rqstp, __be32 *p) { struct nfsd3_linkres *resp = rqstp->rq_resp; + *p++ = resp->status; p = encode_post_op_attr(rqstp, p, &resp->fh); p = encode_wcc_data(rqstp, p, &resp->tfh); return xdr_ressize_check(rqstp, p); @@ -807,6 +814,7 @@ nfs3svc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p) { struct nfsd3_readdirres *resp = rqstp->rq_resp; + *p++ = resp->status; p = encode_post_op_attr(rqstp, p, &resp->fh); if (resp->status == 0) { @@ -1059,6 +1067,7 @@ nfs3svc_encode_fsstatres(struct svc_rqst *rqstp, __be32 *p) struct kstatfs *s = &resp->stats; u64 bs = s->f_bsize; + *p++ = resp->status; *p++ = xdr_zero; /* no post_op_attr */ if (resp->status == 0) { @@ -1079,6 +1088,7 @@ nfs3svc_encode_fsinfores(struct svc_rqst *rqstp, __be32 *p) { struct nfsd3_fsinfores *resp = rqstp->rq_resp; + *p++ = resp->status; *p++ = xdr_zero; /* no post_op_attr */ if (resp->status == 0) { @@ -1124,6 +1134,7 @@ nfs3svc_encode_commitres(struct svc_rqst *rqstp, __be32 *p) { struct nfsd3_commitres *resp = rqstp->rq_resp; + *p++ = resp->status; p = encode_wcc_data(rqstp, p, &resp->fh); /* Write verifier */ if (resp->status == 0) { -- cgit v1.2.3