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
  34 struct cld_net;
  35 struct 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  */
  45 struct 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         /* protected by blocked_locks_lock */
  89         struct list_head blocked_locks_lru;
  90
  91         struct delayed_work laundromat_work;
  92
  93         /* client_lock protects the client lru list and session hash table */
  94         spinlock_t client_lock;
  95
  96         /* protects blocked_locks_lru */
  97         spinlock_t blocked_locks_lock;
  98
  99         struct file *rec_file;
 100         bool in_grace;
 101         const struct nfsd4_client_tracking_ops *client_tracking_ops;
 102
 103         time_t nfsd4_lease;
 104         time_t nfsd4_grace;
 105
 106         bool nfsd_net_up;
 107         bool lockd_up;
 108
 109         /* Time of server startup */
 110         struct timespec64 nfssvc_boot;
 111
 112         /*
 113          * Max number of connections this nfsd container will allow. Defaults
 114          * to '0' which is means that it bases this on the number of threads.
 115          */
 116         unsigned int max_connections;
 117
 118         u32 clientid_counter;
 119         u32 clverifier_counter;
 120
 121         struct svc_serv *nfsd_serv;
 122
 123         wait_queue_head_t ntf_wq;
 124         atomic_t ntf_refcnt;
 125 };
 126
 127 /* Simple check to find out if a given net was properly initialized */
 128 #define nfsd_netns_ready(nn) ((nn)->sessionid_hashtbl)
 129
 130 extern unsigned int nfsd_net_id;
 131 #endif /* __NFSD_NETNS_H__ */