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
encode_seek(struct xdr_stream * xdr,struct nfs42_seek_args * args,struct compound_hdr * hdr)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 */
nfs4_xdr_enc_seek(struct rpc_rqst * req,struct xdr_stream * xdr,struct nfs42_seek_args * args)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
decode_seek(struct xdr_stream * xdr,struct nfs42_seek_res * res)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 */
nfs4_xdr_dec_seek(struct rpc_rqst * rqstp,struct xdr_stream * xdr,struct nfs42_seek_res * res)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 */
99