C++ xdr_decode_hyper函数代码示例

static __be32 decode_lockowner(struct xdr_stream *xdr, struct cb_notify_lock_args *args)
{
	__be32		*p;
	unsigned int	len;

	p = read_buf(xdr, 12);
	if (unlikely(p == NULL))
		return htonl(NFS4ERR_BADXDR);

	p = xdr_decode_hyper(p, &args->cbnl_owner.clientid);
	len = be32_to_cpu(*p);

	p = read_buf(xdr, len);
	if (unlikely(p == NULL))
		return htonl(NFS4ERR_BADXDR);

	/* Only try to decode if the length is right */
	if (len == 20) {
		p += 2;	/* skip "lock id:" */
		args->cbnl_owner.s_dev = be32_to_cpu(*p++);
		xdr_decode_hyper(p, &args->cbnl_owner.id);
		args->cbnl_valid = true;
	} else {
		args->cbnl_owner.s_dev = 0;
		args->cbnl_owner.id = 0;
		args->cbnl_valid = false;
	}
	return 0;
}

static int
nlm4clt_decode_testres(struct rpc_rqst *req, __be32 *p, struct nlm_res *resp)
{
    if (!(p = nlm4_decode_cookie(p, &resp->cookie)))
        return -EIO;
    resp->status = *p++;
    if (resp->status == nlm_lck_denied) {
        struct file_lock    *fl = &resp->lock.fl;
        u32            excl;
        __u64            start, len;
        __s64            end;

        memset(&resp->lock, 0, sizeof(resp->lock));
        locks_init_lock(fl);
        excl = ntohl(*p++);
        resp->lock.svid = ntohl(*p++);
        fl->fl_pid = (pid_t)resp->lock.svid;
        if (!(p = nlm4_decode_oh(p, &resp->lock.oh)))
            return -EIO;

        fl->fl_flags = FL_POSIX;
        fl->fl_type  = excl? F_WRLCK : F_RDLCK;
        p = xdr_decode_hyper(p, &start);
        p = xdr_decode_hyper(p, &len);
        end = start + len - 1;

        fl->fl_start = s64_to_loff_t(start);
        if (len == 0 || end < 0)
            fl->fl_end = OFFSET_MAX;
        else
            fl->fl_end = s64_to_loff_t(end);
    }
    return 0;
}

static __be32 *
nlm4_decode_lock(__be32 *p, struct nlm_lock *lock)
{
	struct file_lock	*fl = &lock->fl;
	__u64			len, start;
	__s64			end;

	if (!(p = xdr_decode_string_inplace(p, &lock->caller,
					    &lock->len, NLM_MAXSTRLEN))
	 || !(p = nlm4_decode_fh(p, &lock->fh))
	 || !(p = nlm4_decode_oh(p, &lock->oh)))
		return NULL;
	lock->svid  = ntohl(*p++);

	locks_init_lock(fl);
	fl->fl_owner = current->files;
	fl->fl_pid   = (pid_t)lock->svid;
	fl->fl_flags = FL_POSIX;
	fl->fl_type  = F_RDLCK;		/* as good as anything else */
	p = xdr_decode_hyper(p, &start);
	p = xdr_decode_hyper(p, &len);
	end = start + len - 1;

	fl->fl_start = s64_to_loff_t(start);

	if (len == 0 || end < 0)
		fl->fl_end = OFFSET_MAX;
	else
		fl->fl_end = s64_to_loff_t(end);
	return p;
}

static __be32 decode_layoutrecall_args(struct svc_rqst *rqstp,
				       struct xdr_stream *xdr,
				       struct cb_layoutrecallargs *args)
{
	__be32 *p;
	__be32 status = 0;
	uint32_t iomode;

	args->cbl_addr = svc_addr(rqstp);
	p = read_buf(xdr, 4 * sizeof(uint32_t));
	if (unlikely(p == NULL)) {
		status = htonl(NFS4ERR_BADXDR);
		goto out;
	}

	args->cbl_layout_type = ntohl(*p++);
	/* Depite the spec's xdr, iomode really belongs in the FILE switch,
	 * as it is unusable and ignored with the other types.
	 */
	iomode = ntohl(*p++);
	args->cbl_layoutchanged = ntohl(*p++);
	args->cbl_recall_type = ntohl(*p++);

	if (args->cbl_recall_type == RETURN_FILE) {
		args->cbl_range.iomode = iomode;
		status = decode_fh(xdr, &args->cbl_fh);
		if (unlikely(status != 0))
			goto out;

		p = read_buf(xdr, 2 * sizeof(uint64_t));
		if (unlikely(p == NULL)) {
			status = htonl(NFS4ERR_BADXDR);
			goto out;
		}
		p = xdr_decode_hyper(p, &args->cbl_range.offset);
		p = xdr_decode_hyper(p, &args->cbl_range.length);
		status = decode_stateid(xdr, &args->cbl_stateid);
		if (unlikely(status != 0))
			goto out;
	} else if (args->cbl_recall_type == RETURN_FSID) {
		p = read_buf(xdr, 2 * sizeof(uint64_t));
		if (unlikely(p == NULL)) {
			status = htonl(NFS4ERR_BADXDR);
			goto out;
		}
		p = xdr_decode_hyper(p, &args->cbl_fsid.major);
		p = xdr_decode_hyper(p, &args->cbl_fsid.minor);
	} else if (args->cbl_recall_type != RETURN_ALL) {
		status = htonl(NFS4ERR_BADXDR);
		goto out;
	}
	dprintk("%s: ltype 0x%x iomode %d changed %d recall_type %d\n",
		__func__,
		args->cbl_layout_type, iomode,
		args->cbl_layoutchanged, args->cbl_recall_type);
out:
	dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
	return status;
}

static __be32 *
_osd_xdr_decode_objid(__be32 *p, struct pnfs_osd_objid *objid)
{
	p = xdr_decode_opaque_fixed(p, objid->oid_device_id.data,
				    sizeof(objid->oid_device_id.data));

	p = xdr_decode_hyper(p, &objid->oid_partition_id);
	p = xdr_decode_hyper(p, &objid->oid_object_id);
	return p;
}

static int decode_fattr3(struct xdr_stream *xdr, struct nfs_fattr *fattr)
{
	umode_t fmode;
	__be32 *p;

	p = xdr_inline_decode(xdr, NFS3_fattr_sz << 2);
	if (unlikely(p == NULL))
		goto out_overflow;

	p = xdr_decode_ftype3(p, &fmode);

	fattr->mode = (be32_to_cpup(p++) & ~S_IFMT) | fmode;
	fattr->nlink = be32_to_cpup(p++);
	fattr->uid = be32_to_cpup(p++);
	fattr->gid = be32_to_cpup(p++);

	p = xdr_decode_size3(p, &fattr->size);
	p = xdr_decode_size3(p, &fattr->du.nfs3.used);
	p = xdr_decode_specdata3(p, &fattr->rdev);

	p = xdr_decode_hyper(p, &fattr->fsid.major);
	fattr->fsid.minor = 0;

	p = xdr_decode_fileid3(p, &fattr->fileid);
	p = xdr_decode_nfstime3(p, &fattr->atime);
	p = xdr_decode_nfstime3(p, &fattr->mtime);
	xdr_decode_nfstime3(p, &fattr->ctime);

	fattr->valid |= NFS_ATTR_FATTR_V3;
	return 0;
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
}

int
nfs3svc_decode_readdirplusargs(struct svc_rqst *rqstp, __be32 *p)
{
	struct nfsd3_readdirargs *args = rqstp->rq_argp;
	int len;
	u32 max_blocksize = svc_max_payload(rqstp);

	p = decode_fh(p, &args->fh);
	if (!p)
		return 0;
	p = xdr_decode_hyper(p, &args->cookie);
	args->verf     = p; p += 2;
	args->dircount = ntohl(*p++);
	args->count    = ntohl(*p++);

	len = args->count = min(args->count, max_blocksize);
	while (len > 0) {
		struct page *p = *(rqstp->rq_next_page++);
		if (!args->buffer)
			args->buffer = page_address(p);
		len -= PAGE_SIZE;
	}

	return xdr_argsize_check(rqstp, p);
}

int
nfs3svc_decode_readargs(struct svc_rqst *rqstp, __be32 *p)
{
	struct nfsd3_readargs *args = rqstp->rq_argp;
	unsigned int len;
	int v;
	u32 max_blocksize = svc_max_payload(rqstp);

	p = decode_fh(p, &args->fh);
	if (!p)
		return 0;
	p = xdr_decode_hyper(p, &args->offset);

	args->count = ntohl(*p++);
	len = min(args->count, max_blocksize);

	/* set up the kvec */
	v=0;
	while (len > 0) {
		struct page *p = *(rqstp->rq_next_page++);

		rqstp->rq_vec[v].iov_base = page_address(p);
		rqstp->rq_vec[v].iov_len = min_t(unsigned int, len, PAGE_SIZE);
		len -= rqstp->rq_vec[v].iov_len;
		v++;
	}
	args->vlen = v;
	return xdr_argsize_check(rqstp, p);
}

static int decode_nlm4_holder(struct xdr_stream *xdr, struct nlm_res *result)
{
	struct nlm_lock *lock = &result->lock;
	struct file_lock *fl = &lock->fl;
	u64 l_offset, l_len;
	u32 exclusive;
	int error;
	__be32 *p;
	s32 end;

	memset(lock, 0, sizeof(*lock));
	locks_init_lock(fl);

	p = xdr_inline_decode(xdr, 4 + 4);
	if (unlikely(p == NULL))
		goto out_overflow;
	exclusive = be32_to_cpup(p++);
	lock->svid = be32_to_cpup(p);
	fl->fl_pid = (pid_t)lock->svid;

	error = decode_netobj(xdr, &lock->oh);
	if (unlikely(error))
		goto out;

	p = xdr_inline_decode(xdr, 8 + 8);
	if (unlikely(p == NULL))
		goto out_overflow;

	fl->fl_flags = FL_POSIX;
	fl->fl_type  = exclusive != 0 ? F_WRLCK : F_RDLCK;
	p = xdr_decode_hyper(p, &l_offset);
	xdr_decode_hyper(p, &l_len);
	end = l_offset + l_len - 1;

	fl->fl_start = (loff_t)l_offset;
	if (l_len == 0 || end < 0)
		fl->fl_end = OFFSET_MAX;
	else
		fl->fl_end = (loff_t)end;
	error = 0;
out:
	return error;
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
}

static inline u32 *
xdr_decode_wcc_attr(u32 *p, struct nfs_fattr *fattr)
{
	p = xdr_decode_hyper(p, &fattr->pre_size);
	p = xdr_decode_time3(p, &fattr->pre_mtime);
	p = xdr_decode_time3(p, &fattr->pre_ctime);
	fattr->valid |= NFS_ATTR_WCC;
	return p;
}

static int gssx_dec_status(struct xdr_stream *xdr,
			   struct gssx_status *status)
{
	__be32 *p;
	int err;

	/* status->major_status */
	p = xdr_inline_decode(xdr, 8);
	if (unlikely(p == NULL))
		return -ENOSPC;
	p = xdr_decode_hyper(p, &status->major_status);

	/* status->mech */
	err = gssx_dec_buffer(xdr, &status->mech);
	if (err)
		return err;

	/* status->minor_status */
	p = xdr_inline_decode(xdr, 8);
	if (unlikely(p == NULL))
		return -ENOSPC;
	p = xdr_decode_hyper(p, &status->minor_status);

	/* status->major_status_string */
	err = gssx_dec_buffer(xdr, &status->major_status_string);
	if (err)
		return err;

	/* status->minor_status_string */
	err = gssx_dec_buffer(xdr, &status->minor_status_string);
	if (err)
		return err;

	/* status->server_ctx */
	err = gssx_dec_buffer(xdr, &status->server_ctx);
	if (err)
		return err;

	/* we assume we have no options for now, so simply consume them */
	/* status->options */
	err = dummy_dec_opt_array(xdr, &status->options);

	return err;
}

static __be32 decode_layoutrecall_args(struct svc_rqst *rqstp,
				       struct xdr_stream *xdr, void *argp)
{
	struct cb_layoutrecallargs *args = argp;
	__be32 *p;
	__be32 status = 0;
	uint32_t iomode;

	p = read_buf(xdr, 4 * sizeof(uint32_t));
	if (unlikely(p == NULL))
		return htonl(NFS4ERR_BADXDR);

	args->cbl_layout_type = ntohl(*p++);
	/* Depite the spec's xdr, iomode really belongs in the FILE switch,
	 * as it is unusable and ignored with the other types.
	 */
	iomode = ntohl(*p++);
	args->cbl_layoutchanged = ntohl(*p++);
	args->cbl_recall_type = ntohl(*p++);

	if (args->cbl_recall_type == RETURN_FILE) {
		args->cbl_range.iomode = iomode;
		status = decode_fh(xdr, &args->cbl_fh);
		if (unlikely(status != 0))
			return status;

		p = read_buf(xdr, 2 * sizeof(uint64_t));
		if (unlikely(p == NULL))
			return htonl(NFS4ERR_BADXDR);
		p = xdr_decode_hyper(p, &args->cbl_range.offset);
		p = xdr_decode_hyper(p, &args->cbl_range.length);
		return decode_layout_stateid(xdr, &args->cbl_stateid);
	} else if (args->cbl_recall_type == RETURN_FSID) {
		p = read_buf(xdr, 2 * sizeof(uint64_t));
		if (unlikely(p == NULL))
			return htonl(NFS4ERR_BADXDR);
		p = xdr_decode_hyper(p, &args->cbl_fsid.major);
		p = xdr_decode_hyper(p, &args->cbl_fsid.minor);
	} else if (args->cbl_recall_type != RETURN_ALL)
		return htonl(NFS4ERR_BADXDR);
	return 0;
}

int
nfs3svc_decode_commitargs(struct svc_rqst *rqstp, u32 *p,
					struct nfsd3_commitargs *args)
{
	if (!(p = decode_fh(p, &args->fh)))
		return 0;
	p = xdr_decode_hyper(p, &args->offset);
	args->count = ntohl(*p++);

	return xdr_argsize_check(rqstp, p);
}

int
nfs3svc_decode_commitargs(struct svc_rqst *rqstp, __be32 *p)
{
	struct nfsd3_commitargs *args = rqstp->rq_argp;
	p = decode_fh(p, &args->fh);
	if (!p)
		return 0;
	p = xdr_decode_hyper(p, &args->offset);
	args->count = ntohl(*p++);

	return xdr_argsize_check(rqstp, p);
}

int
nfs3svc_decode_readdirplusargs(struct svc_rqst *rqstp, u32 *p,
					struct nfsd3_readdirargs *args)
{
	if (!(p = decode_fh(p, &args->fh)))
		return 0;
	p = xdr_decode_hyper(p, &args->cookie);
	args->verf     = p; p += 2;
	args->dircount = ntohl(*p++);
	args->count    = ntohl(*p++);

	return xdr_argsize_check(rqstp, p);
}