| Anna Schumaker | 1c6dcbe | 2014-09-26 13:58:48 -0400 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2014 Anna Schumaker <Anna.Schumaker@Netapp.com> |
| 3 | */ |
| 4 | #ifndef __LINUX_FS_NFS_NFS4_2XDR_H |
| 5 | #define __LINUX_FS_NFS_NFS4_2XDR_H |
| 6 | |
| 7 | #define encode_seek_maxsz (op_encode_hdr_maxsz + \ |
| 8 | encode_stateid_maxsz + \ |
| 9 | 2 /* offset */ + \ |
| 10 | 1 /* whence */) |
| 11 | #define decode_seek_maxsz (op_decode_hdr_maxsz + \ |
| 12 | 1 /* eof */ + \ |
| 13 | 1 /* whence */ + \ |
| 14 | 2 /* offset */ + \ |
| 15 | 2 /* length */) |
| 16 | |
| 17 | #define NFS4_enc_seek_sz (compound_encode_hdr_maxsz + \ |
| 18 | encode_putfh_maxsz + \ |
| 19 | encode_seek_maxsz) |
| 20 | #define NFS4_dec_seek_sz (compound_decode_hdr_maxsz + \ |
| 21 | decode_putfh_maxsz + \ |
| 22 | decode_seek_maxsz) |
| 23 | |
| 24 | |
| 25 | static void encode_seek(struct xdr_stream *xdr, |
| 26 | struct nfs42_seek_args *args, |
| 27 | struct compound_hdr *hdr) |
| 28 | { |
| 29 | encode_op_hdr(xdr, OP_SEEK, decode_seek_maxsz, hdr); |
| 30 | encode_nfs4_stateid(xdr, &args->sa_stateid); |
| 31 | encode_uint64(xdr, args->sa_offset); |
| 32 | encode_uint32(xdr, args->sa_what); |
| 33 | } |
| 34 | |
| 35 | /* |
| 36 | * Encode SEEK request |
| 37 | */ |
| 38 | static void nfs4_xdr_enc_seek(struct rpc_rqst *req, |
| 39 | struct xdr_stream *xdr, |
| 40 | struct nfs42_seek_args *args) |
| 41 | { |
| 42 | struct compound_hdr hdr = { |
| 43 | .minorversion = nfs4_xdr_minorversion(&args->seq_args), |
| 44 | }; |
| 45 | |
| 46 | encode_compound_hdr(xdr, req, &hdr); |
| 47 | encode_sequence(xdr, &args->seq_args, &hdr); |
| 48 | encode_putfh(xdr, args->sa_fh, &hdr); |
| 49 | encode_seek(xdr, args, &hdr); |
| 50 | encode_nops(&hdr); |
| 51 | } |
| 52 | |
| 53 | static int decode_seek(struct xdr_stream *xdr, struct nfs42_seek_res *res) |
| 54 | { |
| 55 | int status; |
| 56 | __be32 *p; |
| 57 | |
| 58 | status = decode_op_hdr(xdr, OP_SEEK); |
| 59 | if (status) |
| 60 | return status; |
| 61 | |
| 62 | p = xdr_inline_decode(xdr, 4 + 8); |
| 63 | if (unlikely(!p)) |
| 64 | goto out_overflow; |
| 65 | |
| 66 | res->sr_eof = be32_to_cpup(p++); |
| 67 | p = xdr_decode_hyper(p, &res->sr_offset); |
| 68 | return 0; |
| 69 | |
| 70 | out_overflow: |
| 71 | print_overflow_msg(__func__, xdr); |
| 72 | return -EIO; |
| 73 | } |
| 74 | |
| 75 | /* |
| 76 | * Decode SEEK request |
| 77 | */ |
| 78 | static int nfs4_xdr_dec_seek(struct rpc_rqst *rqstp, |
| 79 | struct xdr_stream *xdr, |
| 80 | struct nfs42_seek_res *res) |
| 81 | { |
| 82 | struct compound_hdr hdr; |
| 83 | int status; |
| 84 | |
| 85 | status = decode_compound_hdr(xdr, &hdr); |
| 86 | if (status) |
| 87 | goto out; |
| 88 | status = decode_sequence(xdr, &res->seq_res, rqstp); |
| 89 | if (status) |
| 90 | goto out; |
| 91 | status = decode_putfh(xdr); |
| 92 | if (status) |
| 93 | goto out; |
| 94 | status = decode_seek(xdr, res); |
| 95 | out: |
| 96 | return status; |
| 97 | } |
| 98 | #endif /* __LINUX_FS_NFS_NFS4_2XDR_H */ |