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1c6dcbe5ce
The SEEK operation is used when an application makes an lseek call with either the SEEK_HOLE or SEEK_DATA flags set. I fall back on nfs_file_llseek() if the server does not have SEEK support. Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com> Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
99 lines
2.2 KiB
C
99 lines
2.2 KiB
C
/*
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* Copyright (c) 2014 Anna Schumaker <Anna.Schumaker@Netapp.com>
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*/
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#ifndef __LINUX_FS_NFS_NFS4_2XDR_H
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#define __LINUX_FS_NFS_NFS4_2XDR_H
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#define encode_seek_maxsz (op_encode_hdr_maxsz + \
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encode_stateid_maxsz + \
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2 /* offset */ + \
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1 /* whence */)
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#define decode_seek_maxsz (op_decode_hdr_maxsz + \
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1 /* eof */ + \
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1 /* whence */ + \
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2 /* offset */ + \
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2 /* length */)
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#define NFS4_enc_seek_sz (compound_encode_hdr_maxsz + \
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encode_putfh_maxsz + \
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encode_seek_maxsz)
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#define NFS4_dec_seek_sz (compound_decode_hdr_maxsz + \
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decode_putfh_maxsz + \
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decode_seek_maxsz)
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static void encode_seek(struct xdr_stream *xdr,
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struct nfs42_seek_args *args,
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struct compound_hdr *hdr)
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{
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encode_op_hdr(xdr, OP_SEEK, decode_seek_maxsz, hdr);
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encode_nfs4_stateid(xdr, &args->sa_stateid);
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encode_uint64(xdr, args->sa_offset);
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encode_uint32(xdr, args->sa_what);
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}
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/*
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* Encode SEEK request
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*/
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static void nfs4_xdr_enc_seek(struct rpc_rqst *req,
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struct xdr_stream *xdr,
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struct nfs42_seek_args *args)
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{
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struct compound_hdr hdr = {
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.minorversion = nfs4_xdr_minorversion(&args->seq_args),
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};
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encode_compound_hdr(xdr, req, &hdr);
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encode_sequence(xdr, &args->seq_args, &hdr);
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encode_putfh(xdr, args->sa_fh, &hdr);
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encode_seek(xdr, args, &hdr);
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encode_nops(&hdr);
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}
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static int decode_seek(struct xdr_stream *xdr, struct nfs42_seek_res *res)
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{
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int status;
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__be32 *p;
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status = decode_op_hdr(xdr, OP_SEEK);
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if (status)
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return status;
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p = xdr_inline_decode(xdr, 4 + 8);
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if (unlikely(!p))
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goto out_overflow;
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res->sr_eof = be32_to_cpup(p++);
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p = xdr_decode_hyper(p, &res->sr_offset);
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return 0;
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out_overflow:
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print_overflow_msg(__func__, xdr);
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return -EIO;
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}
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/*
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* Decode SEEK request
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*/
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static int nfs4_xdr_dec_seek(struct rpc_rqst *rqstp,
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struct xdr_stream *xdr,
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struct nfs42_seek_res *res)
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{
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struct compound_hdr hdr;
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int status;
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status = decode_compound_hdr(xdr, &hdr);
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if (status)
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goto out;
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status = decode_sequence(xdr, &res->seq_res, rqstp);
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if (status)
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goto out;
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status = decode_putfh(xdr);
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if (status)
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goto out;
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status = decode_seek(xdr, res);
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out:
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return status;
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}
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#endif /* __LINUX_FS_NFS_NFS4_2XDR_H */
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