LXR linux/fs/nfsd/netns.h

   1/*
   2 * per net namespace data structures for nfsd
   3 *
   4 * Copyright (C) 2012, Jeff Layton <jlayton@redhat.com>
   5 *
   6 * This program is free software; you can redistribute it and/or modify it
   7 * under the terms of the GNU General Public License as published by the Free
   8 * Software Foundation; either version 2 of the License, or (at your option)
   9 * any later version.
  10 *
  11 * This program is distributed in the hope that it will be useful, but WITHOUT
  12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14 * more details.
  15 *
  16 * You should have received a copy of the GNU General Public License along with
  17 * this program; if not, write to the Free Software Foundation, Inc., 51
  18 * Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  19 */
  20
  21#ifndef __NFSD_NETNS_H__
  22#define __NFSD_NETNS_H__
  23
  24#include <net/net_namespace.h>
  25#include <net/netns/generic.h>
  26
  27/* Hash tables for nfs4_clientid state */
  28#define CLIENT_HASH_BITS                 4
  29#define CLIENT_HASH_SIZE                (1 << CLIENT_HASH_BITS)
  30#define CLIENT_HASH_MASK                (CLIENT_HASH_SIZE - 1)
  31
  32#define SESSION_HASH_SIZE       512
  33
  34struct cld_net;
  35struct nfsd4_client_tracking_ops;
  36
  37/*
  38 * Represents a nfsd "container". With respect to nfsv4 state tracking, the
  39 * fields of interest are the *_id_hashtbls and the *_name_tree. These track
  40 * the nfs4_client objects by either short or long form clientid.
  41 *
  42 * Each nfsd_net runs a nfs4_laundromat workqueue job when necessary to clean
  43 * up expired clients and delegations within the container.
  44 */
  45struct nfsd_net {
  46        struct cld_net *cld_net;
  47
  48        struct cache_detail *svc_expkey_cache;
  49        struct cache_detail *svc_export_cache;
  50
  51        struct cache_detail *idtoname_cache;
  52        struct cache_detail *nametoid_cache;
  53
  54        struct lock_manager nfsd4_manager;
  55        bool grace_ended;
  56        time_t boot_time;
  57
  58        /*
  59         * reclaim_str_hashtbl[] holds known client info from previous reset/reboot
  60         * used in reboot/reset lease grace period processing
  61         *
  62         * conf_id_hashtbl[], and conf_name_tree hold confirmed
  63         * setclientid_confirmed info.
  64         *
  65         * unconf_str_hastbl[] and unconf_name_tree hold unconfirmed
  66         * setclientid info.
  67         */
  68        struct list_head *reclaim_str_hashtbl;
  69        int reclaim_str_hashtbl_size;
  70        struct list_head *conf_id_hashtbl;
  71        struct rb_root conf_name_tree;
  72        struct list_head *unconf_id_hashtbl;
  73        struct rb_root unconf_name_tree;
  74        struct list_head *sessionid_hashtbl;
  75        /*
  76         * client_lru holds client queue ordered by nfs4_client.cl_time
  77         * for lease renewal.
  78         *
  79         * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
  80         * for last close replay.
  81         *
  82         * All of the above fields are protected by the client_mutex.
  83         */
  84        struct list_head client_lru;
  85        struct list_head close_lru;
  86        struct list_head del_recall_lru;
  87
  88        struct delayed_work laundromat_work;
  89
  90        /* client_lock protects the client lru list and session hash table */
  91        spinlock_t client_lock;
  92
  93        struct file *rec_file;
  94        bool in_grace;
  95        struct nfsd4_client_tracking_ops *client_tracking_ops;
  96
  97        time_t nfsd4_lease;
  98        time_t nfsd4_grace;
  99
 100        bool nfsd_net_up;
 101        bool lockd_up;
 102
 103        /* Time of server startup */
 104        struct timeval nfssvc_boot;
 105
 106        /*
 107         * Max number of connections this nfsd container will allow. Defaults
 108         * to '0' which is means that it bases this on the number of threads.
 109         */
 110        unsigned int max_connections;
 111
 112        u32 clientid_counter;
 113        u32 clverifier_counter;
 114
 115        struct svc_serv *nfsd_serv;
 116};
 117
 118/* Simple check to find out if a given net was properly initialized */
 119#define nfsd_netns_ready(nn) ((nn)->sessionid_hashtbl)
 120
 121extern int nfsd_net_id;
 122#endif /* __NFSD_NETNS_H__ */
 123