On Wed, Dec 14, 2011 at 08:54:49AM -0500, Jeff Layton wrote:
> Add a new header that describes the clname tracking daemon upcall. The
> daemon takes a versioned binary struct. Hopefully this should allow us
> to revise the struct later if it becomes necessary.
>
> Signed-off-by: Jeff Layton <jlayton@xxxxxxxxxx>
> ---
> include/linux/nfsd/clstate.h | 59 ++++++++++++++++++++++++++++++++++++++++++
> 1 files changed, 59 insertions(+), 0 deletions(-)
> create mode 100644 include/linux/nfsd/clstate.h
>
> diff --git a/include/linux/nfsd/clstate.h b/include/linux/nfsd/clstate.h
> new file mode 100644
> index 0000000..d571aa5
> --- /dev/null
> +++ b/include/linux/nfsd/clstate.h
> @@ -0,0 +1,59 @@
> +/*
> + * fs/nfsd/clstate.h - data type and function declarations for clstate mgmt
> + *
> + * 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_CLSTATE_H
> +#define _NFSD_CLSTATE_H
> +
> +/* latest upcall version available */
> +#define CLSTATE_MAX_UPCALL_VERSION 1
> +
> +/* defined by RFC3530 */
> +#define NFS4_OPAQUE_LIMIT 1024
> +
> +/*
> + * Maximum length of an address string. We could use INET6_ADDRSTRLEN, but
> + * the kernel and userspace definitions are different.
> + */
> +#define CLSTATE_MAX_ADDRESS_LEN 48
> +
> +enum clstate_command {
> + Cl_Create, /* create a record for this cm_id */
> + Cl_Expire, /* remove record for this cm_id */
> + Cl_NrToReclaim, /* how many client records need reclaim? */
There will probably also be other information we want from userspace on
startup, and this might be a good place to get it. (For example, a boot
iteration and/or node id for use in clientid's.)
--b.
> + Cl_Allow, /* is this cm_id allowed? */
> + Cl_GraceDone /* grace period is complete */
> +};
> +
> +/* message struct for communication with userspace */
> +struct clstate_msg {
> + uint8_t cm_vers; /* upcall version */
> + uint8_t cm_cmd; /* upcall command */
> + uint32_t cm_xid; /* transaction id */
> + int16_t cm_status; /* return code */
> + uint16_t cm_len; /* length of cm_id */
> + unsigned char cm_addr[CLSTATE_MAX_ADDRESS_LEN]; /* server addr */
> + union {
> + int64_t cm_gracetime; /* grace period start time */
> + unsigned char cm_id[NFS4_OPAQUE_LIMIT]; /* client-provided */
> + } __attribute__((packed)) cm_u;
> +} __attribute__((packed));
> +
> +#endif /* !_NFSD_CLSTATE_H */
> --
> 1.7.1
>
> --
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