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1c6dcbe5 AS |
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 */ |