From bac966d6065207b6900a4c2a3e6e5f78cfee7b4d Mon Sep 17 00:00:00 2001 From: "J. Bruce Fields" Date: Sat, 6 May 2017 11:12:04 -0400 Subject: [PATCH] nfsd4: individual encoders no longer see error cases With a few exceptions, most individual encoders don't handle error cases. Signed-off-by: J. Bruce Fields --- fs/nfsd/nfs4xdr.c | 309 ++++++++++++++++------------------------------ 1 file changed, 103 insertions(+), 206 deletions(-) diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c index 08badcf64554..18b9c2fad29a 100644 --- a/fs/nfsd/nfs4xdr.c +++ b/fs/nfsd/nfs4xdr.c @@ -3105,14 +3105,12 @@ nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_ struct xdr_stream *xdr = &resp->xdr; __be32 *p; - if (!nfserr) { - p = xdr_reserve_space(xdr, 8); - if (!p) - return nfserr_resource; - *p++ = cpu_to_be32(access->ac_supported); - *p++ = cpu_to_be32(access->ac_resp_access); - } - return nfserr; + p = xdr_reserve_space(xdr, 8); + if (!p) + return nfserr_resource; + *p++ = cpu_to_be32(access->ac_supported); + *p++ = cpu_to_be32(access->ac_resp_access); + return 0; } static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts) @@ -3120,17 +3118,15 @@ static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, struct xdr_stream *xdr = &resp->xdr; __be32 *p; - if (!nfserr) { - p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8); - if (!p) - return nfserr_resource; - p = xdr_encode_opaque_fixed(p, bcts->sessionid.data, - NFS4_MAX_SESSIONID_LEN); - *p++ = cpu_to_be32(bcts->dir); - /* Upshifting from TCP to RDMA is not supported */ - *p++ = cpu_to_be32(0); - } - return nfserr; + p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8); + if (!p) + return nfserr_resource; + p = xdr_encode_opaque_fixed(p, bcts->sessionid.data, + NFS4_MAX_SESSIONID_LEN); + *p++ = cpu_to_be32(bcts->dir); + /* Upshifting from TCP to RDMA is not supported */ + *p++ = cpu_to_be32(0); + return 0; } static __be32 @@ -3138,10 +3134,7 @@ nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_c { struct xdr_stream *xdr = &resp->xdr; - if (!nfserr) - nfserr = nfsd4_encode_stateid(xdr, &close->cl_stateid); - - return nfserr; + return nfsd4_encode_stateid(xdr, &close->cl_stateid); } @@ -3151,14 +3144,12 @@ nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_ struct xdr_stream *xdr = &resp->xdr; __be32 *p; - if (!nfserr) { - p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE); - if (!p) - return nfserr_resource; - p = xdr_encode_opaque_fixed(p, commit->co_verf.data, + p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE); + if (!p) + return nfserr_resource; + p = xdr_encode_opaque_fixed(p, commit->co_verf.data, NFS4_VERIFIER_SIZE); - } - return nfserr; + return 0; } static __be32 @@ -3167,15 +3158,13 @@ nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_ struct xdr_stream *xdr = &resp->xdr; __be32 *p; - if (!nfserr) { - p = xdr_reserve_space(xdr, 20); - if (!p) - return nfserr_resource; - encode_cinfo(p, &create->cr_cinfo); - nfserr = nfsd4_encode_bitmap(xdr, create->cr_bmval[0], - create->cr_bmval[1], create->cr_bmval[2]); - } - return nfserr; + p = xdr_reserve_space(xdr, 20); + if (!p) + return nfserr_resource; + encode_cinfo(p, &create->cr_cinfo); + nfserr = nfsd4_encode_bitmap(xdr, create->cr_bmval[0], + create->cr_bmval[1], create->cr_bmval[2]); + return 0; } static __be32 @@ -3184,13 +3173,8 @@ nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4 struct svc_fh *fhp = getattr->ga_fhp; struct xdr_stream *xdr = &resp->xdr; - if (nfserr) - return nfserr; - - nfserr = nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry, - getattr->ga_bmval, - resp->rqstp, 0); - return nfserr; + return nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry, + getattr->ga_bmval, resp->rqstp, 0); } static __be32 @@ -3201,14 +3185,12 @@ nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh unsigned int len; __be32 *p; - if (!nfserr) { - len = fhp->fh_handle.fh_size; - p = xdr_reserve_space(xdr, len + 4); - if (!p) - return nfserr_resource; - p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base, len); - } - return nfserr; + len = fhp->fh_handle.fh_size; + p = xdr_reserve_space(xdr, len + 4); + if (!p) + return nfserr_resource; + p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base, len); + return 0; } /* @@ -3278,10 +3260,7 @@ nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_l { struct xdr_stream *xdr = &resp->xdr; - if (!nfserr) - nfserr = nfsd4_encode_stateid(xdr, &locku->lu_stateid); - - return nfserr; + return nfsd4_encode_stateid(xdr, &locku->lu_stateid); } @@ -3291,13 +3270,11 @@ nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_li struct xdr_stream *xdr = &resp->xdr; __be32 *p; - if (!nfserr) { - p = xdr_reserve_space(xdr, 20); - if (!p) - return nfserr_resource; - p = encode_cinfo(p, &link->li_cinfo); - } - return nfserr; + p = xdr_reserve_space(xdr, 20); + if (!p) + return nfserr_resource; + p = encode_cinfo(p, &link->li_cinfo); + return 0; } @@ -3307,12 +3284,9 @@ nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_op struct xdr_stream *xdr = &resp->xdr; __be32 *p; - if (nfserr) - goto out; - nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid); if (nfserr) - goto out; + return nfserr; p = xdr_reserve_space(xdr, 24); if (!p) return nfserr_resource; @@ -3322,7 +3296,7 @@ nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_op nfserr = nfsd4_encode_bitmap(xdr, open->op_bmval[0], open->op_bmval[1], open->op_bmval[2]); if (nfserr) - goto out; + return nfserr; p = xdr_reserve_space(xdr, 4); if (!p) @@ -3395,8 +3369,7 @@ nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_op BUG(); } /* XXX save filehandle here */ -out: - return nfserr; + return 0; } static __be32 @@ -3404,10 +3377,7 @@ nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct { struct xdr_stream *xdr = &resp->xdr; - if (!nfserr) - nfserr = nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid); - - return nfserr; + return nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid); } static __be32 @@ -3415,10 +3385,7 @@ nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struc { struct xdr_stream *xdr = &resp->xdr; - if (!nfserr) - nfserr = nfsd4_encode_stateid(xdr, &od->od_stateid); - - return nfserr; + return nfsd4_encode_stateid(xdr, &od->od_stateid); } static __be32 nfsd4_encode_splice_read( @@ -3555,20 +3522,15 @@ nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr, struct raparms *ra = NULL; __be32 *p; - if (nfserr) - goto out; - p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */ if (!p) { WARN_ON_ONCE(test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags)); - nfserr = nfserr_resource; - goto out; + return nfserr_resource; } if (resp->xdr.buf->page_len && test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags)) { WARN_ON_ONCE(1); - nfserr = nfserr_resource; - goto out; + return nfserr_resource; } xdr_commit_encode(xdr); @@ -3592,7 +3554,6 @@ nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr, if (nfserr) xdr_truncate_encode(xdr, starting_len); -out: return nfserr; } @@ -3606,9 +3567,6 @@ nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd int length_offset = xdr->buf->len; __be32 *p; - if (nfserr) - return nfserr; - p = xdr_reserve_space(xdr, 4); if (!p) return nfserr_resource; @@ -3652,9 +3610,6 @@ nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4 int starting_len = xdr->buf->len; __be32 *p; - if (nfserr) - return nfserr; - p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE); if (!p) return nfserr_resource; @@ -3740,13 +3695,11 @@ nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_ struct xdr_stream *xdr = &resp->xdr; __be32 *p; - if (!nfserr) { - p = xdr_reserve_space(xdr, 20); - if (!p) - return nfserr_resource; - p = encode_cinfo(p, &remove->rm_cinfo); - } - return nfserr; + p = xdr_reserve_space(xdr, 20); + if (!p) + return nfserr_resource; + p = encode_cinfo(p, &remove->rm_cinfo); + return 0; } static __be32 @@ -3755,19 +3708,16 @@ nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_ struct xdr_stream *xdr = &resp->xdr; __be32 *p; - if (!nfserr) { - p = xdr_reserve_space(xdr, 40); - if (!p) - return nfserr_resource; - p = encode_cinfo(p, &rename->rn_sinfo); - p = encode_cinfo(p, &rename->rn_tinfo); - } - return nfserr; + p = xdr_reserve_space(xdr, 40); + if (!p) + return nfserr_resource; + p = encode_cinfo(p, &rename->rn_sinfo); + p = encode_cinfo(p, &rename->rn_tinfo); + return 0; } static __be32 -nfsd4_do_encode_secinfo(struct xdr_stream *xdr, - __be32 nfserr, struct svc_export *exp) +nfsd4_do_encode_secinfo(struct xdr_stream *xdr, struct svc_export *exp) { u32 i, nflavs, supported; struct exp_flavor_info *flavs; @@ -3775,9 +3725,6 @@ nfsd4_do_encode_secinfo(struct xdr_stream *xdr, __be32 *p, *flavorsp; static bool report = true; - if (nfserr) - goto out; - nfserr = nfserr_resource; if (exp->ex_nflavors) { flavs = exp->ex_flavors; nflavs = exp->ex_nflavors; @@ -3801,7 +3748,7 @@ nfsd4_do_encode_secinfo(struct xdr_stream *xdr, supported = 0; p = xdr_reserve_space(xdr, 4); if (!p) - goto out; + return nfserr_resource; flavorsp = p++; /* to be backfilled later */ for (i = 0; i < nflavs; i++) { @@ -3813,7 +3760,7 @@ nfsd4_do_encode_secinfo(struct xdr_stream *xdr, p = xdr_reserve_space(xdr, 4 + 4 + XDR_LEN(info.oid.len) + 4 + 4); if (!p) - goto out; + return nfserr_resource; *p++ = cpu_to_be32(RPC_AUTH_GSS); p = xdr_encode_opaque(p, info.oid.data, info.oid.len); *p++ = cpu_to_be32(info.qop); @@ -3822,7 +3769,7 @@ nfsd4_do_encode_secinfo(struct xdr_stream *xdr, supported++; p = xdr_reserve_space(xdr, 4); if (!p) - goto out; + return nfserr_resource; *p++ = cpu_to_be32(pf); } else { if (report) @@ -3834,9 +3781,7 @@ nfsd4_do_encode_secinfo(struct xdr_stream *xdr, if (nflavs != supported) report = false; *flavorsp = htonl(supported); - nfserr = 0; -out: - return nfserr; + return 0; } static __be32 @@ -3845,7 +3790,7 @@ nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr, { struct xdr_stream *xdr = &resp->xdr; - return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->si_exp); + return nfsd4_do_encode_secinfo(xdr, secinfo->si_exp); } static __be32 @@ -3854,7 +3799,7 @@ nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr, { struct xdr_stream *xdr = &resp->xdr; - return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->sin_exp); + return nfsd4_do_encode_secinfo(xdr, secinfo->sin_exp); } /* @@ -3915,16 +3860,14 @@ nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_w struct xdr_stream *xdr = &resp->xdr; __be32 *p; - if (!nfserr) { - p = xdr_reserve_space(xdr, 16); - if (!p) - return nfserr_resource; - *p++ = cpu_to_be32(write->wr_bytes_written); - *p++ = cpu_to_be32(write->wr_how_written); - p = xdr_encode_opaque_fixed(p, write->wr_verifier.data, - NFS4_VERIFIER_SIZE); - } - return nfserr; + p = xdr_reserve_space(xdr, 16); + if (!p) + return nfserr_resource; + *p++ = cpu_to_be32(write->wr_bytes_written); + *p++ = cpu_to_be32(write->wr_how_written); + p = xdr_encode_opaque_fixed(p, write->wr_verifier.data, + NFS4_VERIFIER_SIZE); + return 0; } static __be32 @@ -3937,12 +3880,8 @@ nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr, char *server_scope; int major_id_sz; int server_scope_sz; - int status = 0; uint64_t minor_id = 0; - if (nfserr) - return nfserr; - major_id = utsname()->nodename; major_id_sz = strlen(major_id); server_scope = utsname()->nodename; @@ -3967,19 +3906,19 @@ nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr, break; case SP4_MACH_CRED: /* spo_must_enforce bitmap: */ - status = nfsd4_encode_bitmap(xdr, + nfserr = nfsd4_encode_bitmap(xdr, exid->spo_must_enforce[0], exid->spo_must_enforce[1], exid->spo_must_enforce[2]); - if (status) - goto out; + if (nfserr) + return nfserr; /* spo_must_allow bitmap: */ - status = nfsd4_encode_bitmap(xdr, + nfserr = nfsd4_encode_bitmap(xdr, exid->spo_must_allow[0], exid->spo_must_allow[1], exid->spo_must_allow[2]); - if (status) - goto out; + if (nfserr) + return nfserr; break; default: WARN_ON_ONCE(1); @@ -4006,8 +3945,6 @@ nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr, /* Implementation id */ *p++ = cpu_to_be32(0); /* zero length nfs_impl_id4 array */ return 0; -out: - return status; } static __be32 @@ -4017,9 +3954,6 @@ nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct xdr_stream *xdr = &resp->xdr; __be32 *p; - if (nfserr) - return nfserr; - p = xdr_reserve_space(xdr, 24); if (!p) return nfserr_resource; @@ -4073,9 +4007,6 @@ nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr, struct xdr_stream *xdr = &resp->xdr; __be32 *p; - if (nfserr) - return nfserr; - p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20); if (!p) return nfserr_resource; @@ -4100,9 +4031,6 @@ nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_test_stateid_id *stateid, *next; __be32 *p; - if (nfserr) - return nfserr; - p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids)); if (!p) return nfserr_resource; @@ -4112,7 +4040,7 @@ nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr, *p++ = stateid->ts_id_status; } - return nfserr; + return 0; } #ifdef CONFIG_NFSD_PNFS @@ -4125,14 +4053,9 @@ nfsd4_encode_getdeviceinfo(struct nfsd4_compoundres *resp, __be32 nfserr, u32 starting_len = xdr->buf->len, needed_len; __be32 *p; - dprintk("%s: err %d\n", __func__, be32_to_cpu(nfserr)); - if (nfserr) - goto out; - - nfserr = nfserr_resource; p = xdr_reserve_space(xdr, 4); if (!p) - goto out; + return nfserr_resource; *p++ = cpu_to_be32(gdev->gd_layout_type); @@ -4148,41 +4071,33 @@ nfsd4_encode_getdeviceinfo(struct nfsd4_compoundres *resp, __be32 nfserr, */ if (xdr->buf->len + 4 > gdev->gd_maxcount) goto toosmall; - goto out; + return nfserr; } } - nfserr = nfserr_resource; if (gdev->gd_notify_types) { p = xdr_reserve_space(xdr, 4 + 4); if (!p) - goto out; + return nfserr_resource; *p++ = cpu_to_be32(1); /* bitmap length */ *p++ = cpu_to_be32(gdev->gd_notify_types); } else { p = xdr_reserve_space(xdr, 4); if (!p) - goto out; + return nfserr_resource; *p++ = 0; } - nfserr = 0; -out: - dprintk("%s: done: %d\n", __func__, be32_to_cpu(nfserr)); - return nfserr; - + return 0; toosmall: dprintk("%s: maxcount too small\n", __func__); needed_len = xdr->buf->len + 4 /* notifications */; xdr_truncate_encode(xdr, starting_len); p = xdr_reserve_space(xdr, 4); - if (!p) { - nfserr = nfserr_resource; - } else { - *p++ = cpu_to_be32(needed_len); - nfserr = nfserr_toosmall; - } - goto out; + if (!p) + return nfserr_resource; + *p++ = cpu_to_be32(needed_len); + return nfserr_toosmall; } static __be32 @@ -4193,14 +4108,9 @@ nfsd4_encode_layoutget(struct nfsd4_compoundres *resp, __be32 nfserr, const struct nfsd4_layout_ops *ops; __be32 *p; - dprintk("%s: err %d\n", __func__, nfserr); - if (nfserr) - goto out; - - nfserr = nfserr_resource; p = xdr_reserve_space(xdr, 36 + sizeof(stateid_opaque_t)); if (!p) - goto out; + return nfserr_resource; *p++ = cpu_to_be32(1); /* we always set return-on-close */ *p++ = cpu_to_be32(lgp->lg_sid.si_generation); @@ -4214,9 +4124,7 @@ nfsd4_encode_layoutget(struct nfsd4_compoundres *resp, __be32 nfserr, *p++ = cpu_to_be32(lgp->lg_layout_type); ops = nfsd4_layout_ops[lgp->lg_layout_type]; - nfserr = ops->encode_layoutget(xdr, lgp); -out: - return nfserr; + return ops->encode_layoutget(xdr, lgp); } static __be32 @@ -4226,9 +4134,6 @@ nfsd4_encode_layoutcommit(struct nfsd4_compoundres *resp, __be32 nfserr, struct xdr_stream *xdr = &resp->xdr; __be32 *p; - if (nfserr) - return nfserr; - p = xdr_reserve_space(xdr, 4); if (!p) return nfserr_resource; @@ -4240,7 +4145,7 @@ nfsd4_encode_layoutcommit(struct nfsd4_compoundres *resp, __be32 nfserr, p = xdr_encode_hyper(p, lcp->lc_newsize); } - return nfs_ok; + return 0; } static __be32 @@ -4250,16 +4155,13 @@ nfsd4_encode_layoutreturn(struct nfsd4_compoundres *resp, __be32 nfserr, struct xdr_stream *xdr = &resp->xdr; __be32 *p; - if (nfserr) - return nfserr; - p = xdr_reserve_space(xdr, 4); if (!p) return nfserr_resource; *p++ = cpu_to_be32(lrp->lrs_present); if (lrp->lrs_present) return nfsd4_encode_stateid(xdr, &lrp->lr_sid); - return nfs_ok; + return 0; } #endif /* CONFIG_NFSD_PNFS */ @@ -4286,16 +4188,14 @@ nfsd4_encode_copy(struct nfsd4_compoundres *resp, __be32 nfserr, { __be32 *p; - if (!nfserr) { - nfserr = nfsd42_encode_write_res(resp, ©->cp_res); - if (nfserr) - return nfserr; + nfserr = nfsd42_encode_write_res(resp, ©->cp_res); + if (nfserr) + return nfserr; - p = xdr_reserve_space(&resp->xdr, 4 + 4); - *p++ = cpu_to_be32(copy->cp_consecutive); - *p++ = cpu_to_be32(copy->cp_synchronous); - } - return nfserr; + p = xdr_reserve_space(&resp->xdr, 4 + 4); + *p++ = cpu_to_be32(copy->cp_consecutive); + *p++ = cpu_to_be32(copy->cp_synchronous); + return 0; } static __be32 @@ -4304,14 +4204,11 @@ nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr, { __be32 *p; - if (nfserr) - return nfserr; - p = xdr_reserve_space(&resp->xdr, 4 + 8); *p++ = cpu_to_be32(seek->seek_eof); p = xdr_encode_hyper(p, seek->seek_pos); - return nfserr; + return 0; } static __be32 -- 2.20.1