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74725959c3
When nfsdcld was released, it was quickly deprecated in favor of the
nfsdcltrack usermodehelper, so as to not require another running daemon.
That prevents NFSv4 clients from reclaiming locks from nfsd's running in
containers, since neither nfsdcltrack nor the legacy client tracking
code work in containers.
This commit un-deprecates the use of nfsdcld, with one twist: we will
populate the reclaim_str_hashtbl on startup.
During client tracking initialization, do an upcall ("GraceStart") to
nfsdcld to get a list of clients from the database. nfsdcld will do
one downcall with a status of -EINPROGRESS for each client record in
the database, which in turn will cause an nfs4_client_reclaim to be
added to the reclaim_str_hashtbl. When complete, nfsdcld will do a
final downcall with a status of 0.
This will save nfsd from having to do an upcall to the daemon during
nfs4_check_open_reclaim() processing.
Even though nfsdcld was quickly deprecated, there is a very small chance
of old nfsdcld daemons running in the wild. These will respond to the
new "GraceStart" upcall with -EOPNOTSUPP, in which case we will log a
message and fall back to the original nfsdcld tracking ops (now called
nfsd4_cld_tracking_ops_v0).
Signed-off-by: Scott Mayhew <smayhew@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
61 lines
1.9 KiB
C
61 lines
1.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
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/*
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* Upcall description for nfsdcld communication
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*
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* Copyright (c) 2012 Red Hat, Inc.
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* Author(s): Jeff Layton <jlayton@redhat.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef _NFSD_CLD_H
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#define _NFSD_CLD_H
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#include <linux/types.h>
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/* latest upcall version available */
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#define CLD_UPCALL_VERSION 1
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/* defined by RFC3530 */
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#define NFS4_OPAQUE_LIMIT 1024
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enum cld_command {
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Cld_Create, /* create a record for this cm_id */
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Cld_Remove, /* remove record of this cm_id */
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Cld_Check, /* is this cm_id allowed? */
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Cld_GraceDone, /* grace period is complete */
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Cld_GraceStart,
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};
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/* representation of long-form NFSv4 client ID */
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struct cld_name {
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__u16 cn_len; /* length of cm_id */
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unsigned char cn_id[NFS4_OPAQUE_LIMIT]; /* client-provided */
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} __attribute__((packed));
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/* message struct for communication with userspace */
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struct cld_msg {
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__u8 cm_vers; /* upcall version */
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__u8 cm_cmd; /* upcall command */
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__s16 cm_status; /* return code */
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__u32 cm_xid; /* transaction id */
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union {
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__s64 cm_gracetime; /* grace period start time */
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struct cld_name cm_name;
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} __attribute__((packed)) cm_u;
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} __attribute__((packed));
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#endif /* !_NFSD_CLD_H */
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