mirror of
https://github.com/torvalds/linux.git
synced 2024-12-03 17:41:22 +00:00
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
/*
|
|
* Copyright (c) 2014 Anna Schumaker <Anna.Schumaker@Netapp.com>
|
|
*/
|
|
#ifndef __LINUX_FS_NFS_NFS4_2XDR_H
|
|
#define __LINUX_FS_NFS_NFS4_2XDR_H
|
|
|
|
#define encode_seek_maxsz (op_encode_hdr_maxsz + \
|
|
encode_stateid_maxsz + \
|
|
2 /* offset */ + \
|
|
1 /* whence */)
|
|
#define decode_seek_maxsz (op_decode_hdr_maxsz + \
|
|
1 /* eof */ + \
|
|
1 /* whence */ + \
|
|
2 /* offset */ + \
|
|
2 /* length */)
|
|
|
|
#define NFS4_enc_seek_sz (compound_encode_hdr_maxsz + \
|
|
encode_putfh_maxsz + \
|
|
encode_seek_maxsz)
|
|
#define NFS4_dec_seek_sz (compound_decode_hdr_maxsz + \
|
|
decode_putfh_maxsz + \
|
|
decode_seek_maxsz)
|
|
|
|
|
|
static void encode_seek(struct xdr_stream *xdr,
|
|
struct nfs42_seek_args *args,
|
|
struct compound_hdr *hdr)
|
|
{
|
|
encode_op_hdr(xdr, OP_SEEK, decode_seek_maxsz, hdr);
|
|
encode_nfs4_stateid(xdr, &args->sa_stateid);
|
|
encode_uint64(xdr, args->sa_offset);
|
|
encode_uint32(xdr, args->sa_what);
|
|
}
|
|
|
|
/*
|
|
* Encode SEEK request
|
|
*/
|
|
static void nfs4_xdr_enc_seek(struct rpc_rqst *req,
|
|
struct xdr_stream *xdr,
|
|
struct nfs42_seek_args *args)
|
|
{
|
|
struct compound_hdr hdr = {
|
|
.minorversion = nfs4_xdr_minorversion(&args->seq_args),
|
|
};
|
|
|
|
encode_compound_hdr(xdr, req, &hdr);
|
|
encode_sequence(xdr, &args->seq_args, &hdr);
|
|
encode_putfh(xdr, args->sa_fh, &hdr);
|
|
encode_seek(xdr, args, &hdr);
|
|
encode_nops(&hdr);
|
|
}
|
|
|
|
static int decode_seek(struct xdr_stream *xdr, struct nfs42_seek_res *res)
|
|
{
|
|
int status;
|
|
__be32 *p;
|
|
|
|
status = decode_op_hdr(xdr, OP_SEEK);
|
|
if (status)
|
|
return status;
|
|
|
|
p = xdr_inline_decode(xdr, 4 + 8);
|
|
if (unlikely(!p))
|
|
goto out_overflow;
|
|
|
|
res->sr_eof = be32_to_cpup(p++);
|
|
p = xdr_decode_hyper(p, &res->sr_offset);
|
|
return 0;
|
|
|
|
out_overflow:
|
|
print_overflow_msg(__func__, xdr);
|
|
return -EIO;
|
|
}
|
|
|
|
/*
|
|
* Decode SEEK request
|
|
*/
|
|
static int nfs4_xdr_dec_seek(struct rpc_rqst *rqstp,
|
|
struct xdr_stream *xdr,
|
|
struct nfs42_seek_res *res)
|
|
{
|
|
struct compound_hdr hdr;
|
|
int status;
|
|
|
|
status = decode_compound_hdr(xdr, &hdr);
|
|
if (status)
|
|
goto out;
|
|
status = decode_sequence(xdr, &res->seq_res, rqstp);
|
|
if (status)
|
|
goto out;
|
|
status = decode_putfh(xdr);
|
|
if (status)
|
|
goto out;
|
|
status = decode_seek(xdr, res);
|
|
out:
|
|
return status;
|
|
}
|
|
#endif /* __LINUX_FS_NFS_NFS4_2XDR_H */
|