On Dec 21, 2011, at 3:34 PM, Jeff Layton wrote:
> The daemon takes a versioned binary struct. Hopefully this should allow
> us to revise the struct later if it becomes necessary.
This breaks the pattern of using text-based up- and downcalls in NFSD. I assume this is binary because nfs_client_id4 is a string of opaque bytes?
> Signed-off-by: Jeff Layton <jlayton@xxxxxxxxxx>
> ---
> include/linux/nfsd/cld.h | 56 ++++++++++++++++++++++++++++++++++++++++++++++
> 1 files changed, 56 insertions(+), 0 deletions(-)
> create mode 100644 include/linux/nfsd/cld.h
>
> diff --git a/include/linux/nfsd/cld.h b/include/linux/nfsd/cld.h
> new file mode 100644
> index 0000000..d97d678
> --- /dev/null
> +++ b/include/linux/nfsd/cld.h
> @@ -0,0 +1,56 @@
> +/*
> + * fs/nfsd/cld.h - upcall description for nfsdcld communication
> + *
> + * Copyright (c) 2011 Red Hat, Inc.
> + * Author(s): Jeff Layton <jlayton@xxxxxxxxxx>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, write to the Free Software
> + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
> + */
> +
> +#ifndef _NFSD_CLD_H
> +#define _NFSD_CLD_H
> +
> +/* latest upcall version available */
> +#define CLD_UPCALL_VERSION 1
> +
> +/* defined by RFC3530 */
> +#define NFS4_OPAQUE_LIMIT 1024
> +
> +enum cld_command {
> + Cld_Create, /* create a record for this cm_id */
> + Cld_Expire, /* expire record for this cm_id */
> + Cld_Allow, /* is this cm_id allowed? */
> + Cld_GraceDone, /* grace period is complete */
> +};
> +
> +/* representation of long-form NFSv4 client ID */
> +struct cld_name {
> + uint16_t cn_len; /* length of cm_id */
> + unsigned char cn_id[NFS4_OPAQUE_LIMIT]; /* client-provided */
> +} __attribute__((packed));
> +
> +/* message struct for communication with userspace */
> +struct cld_msg {
> + uint8_t cm_vers; /* upcall version */
> + uint8_t cm_cmd; /* upcall command */
> + int16_t cm_status; /* return code */
> + uint32_t cm_xid; /* transaction id */
> + union {
> + int64_t cm_gracetime; /* grace period start time */
> + struct cld_name cm_name;
> + } __attribute__((packed)) cm_u;
> +} __attribute__((packed));
> +
> +#endif /* !_NFSD_CLD_H */
> --
> 1.7.1
>
> --
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--
Chuck Lever
chuck[dot]lever[at]oracle[dot]com
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