1/* SPDX-License-Identifier: GPL-2.0-or-later */ 2/* 3 * per net namespace data structures for nfsd 4 * 5 * Copyright (C) 2012, Jeff Layton <jlayton@redhat.com> 6 */ 7 8#ifndef __NFSD_NETNS_H__ 9#define __NFSD_NETNS_H__ 10 11#include <net/net_namespace.h> 12#include <net/netns/generic.h> 13#include <linux/filelock.h> 14#include <linux/percpu_counter.h> 15#include <linux/siphash.h> 16 17/* Hash tables for nfs4_clientid state */ 18#define CLIENT_HASH_BITS 4 19#define CLIENT_HASH_SIZE (1 << CLIENT_HASH_BITS) 20#define CLIENT_HASH_MASK (CLIENT_HASH_SIZE - 1) 21 22#define SESSION_HASH_SIZE 512 23 24struct cld_net; 25struct nfsd4_client_tracking_ops; 26 27enum { 28 /* cache misses due only to checksum comparison failures */ 29 NFSD_NET_PAYLOAD_MISSES, 30 /* amount of memory (in bytes) currently consumed by the DRC */ 31 NFSD_NET_DRC_MEM_USAGE, 32 NFSD_NET_COUNTERS_NUM 33}; 34 35/* 36 * Represents a nfsd "container". With respect to nfsv4 state tracking, the 37 * fields of interest are the *_id_hashtbls and the *_name_tree. These track 38 * the nfs4_client objects by either short or long form clientid. 39 * 40 * Each nfsd_net runs a nfs4_laundromat workqueue job when necessary to clean 41 * up expired clients and delegations within the container. 42 */ 43struct nfsd_net { 44 struct cld_net *cld_net; 45 46 struct cache_detail *svc_expkey_cache; 47 struct cache_detail *svc_export_cache; 48 49 struct cache_detail *idtoname_cache; 50 struct cache_detail *nametoid_cache; 51 52 struct lock_manager nfsd4_manager; 53 bool grace_ended; 54 time64_t boot_time; 55 56 struct dentry *nfsd_client_dir; 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 time64_t nfsd4_lease; 104 time64_t nfsd4_grace; 105 bool somebody_reclaimed; 106 107 bool track_reclaim_completes; 108 atomic_t nr_reclaim_complete; 109 110 bool nfsd_net_up; 111 bool lockd_up; 112 113 seqlock_t writeverf_lock; 114 unsigned char writeverf[8]; 115 116 /* 117 * Max number of connections this nfsd container will allow. Defaults 118 * to '0' which is means that it bases this on the number of threads. 119 */ 120 unsigned int max_connections; 121 122 u32 clientid_base; 123 u32 clientid_counter; 124 u32 clverifier_counter; 125 126 struct svc_serv *nfsd_serv; 127 /* When a listening socket is added to nfsd, keep_active is set 128 * and this justifies a reference on nfsd_serv. This stops 129 * nfsd_serv from being freed. When the number of threads is 130 * set, keep_active is cleared and the reference is dropped. So 131 * when the last thread exits, the service will be destroyed. 132 */ 133 int keep_active; 134 135 /* 136 * clientid and stateid data for construction of net unique COPY 137 * stateids. 138 */ 139 u32 s2s_cp_cl_id; 140 struct idr s2s_cp_stateids; 141 spinlock_t s2s_cp_lock; 142 143 /* 144 * Version information 145 */ 146 bool *nfsd_versions; 147 bool *nfsd4_minorversions; 148 149 /* 150 * Duplicate reply cache 151 */ 152 struct nfsd_drc_bucket *drc_hashtbl; 153 154 /* max number of entries allowed in the cache */ 155 unsigned int max_drc_entries; 156 157 /* number of significant bits in the hash value */ 158 unsigned int maskbits; 159 unsigned int drc_hashsize; 160 161 /* 162 * Stats and other tracking of on the duplicate reply cache. 163 * The longest_chain* fields are modified with only the per-bucket 164 * cache lock, which isn't really safe and should be fixed if we want 165 * these statistics to be completely accurate. 166 */ 167 168 /* total number of entries */ 169 atomic_t num_drc_entries; 170 171 /* Per-netns stats counters */ 172 struct percpu_counter counter[NFSD_NET_COUNTERS_NUM]; 173 174 /* longest hash chain seen */ 175 unsigned int longest_chain; 176 177 /* size of cache when we saw the longest hash chain */ 178 unsigned int longest_chain_cachesize; 179 180 struct shrinker nfsd_reply_cache_shrinker; 181 182 /* tracking server-to-server copy mounts */ 183 spinlock_t nfsd_ssc_lock; 184 struct list_head nfsd_ssc_mount_list; 185 wait_queue_head_t nfsd_ssc_waitq; 186 187 /* utsname taken from the process that starts the server */ 188 char nfsd_name[UNX_MAXNODENAME+1]; 189 190 struct nfsd_fcache_disposal *fcache_disposal; 191 192 siphash_key_t siphash_key; 193 194 atomic_t nfs4_client_count; 195 int nfs4_max_clients; 196 197 atomic_t nfsd_courtesy_clients; 198 struct shrinker nfsd_client_shrinker; 199 struct work_struct nfsd_shrinker_work; 200}; 201 202/* Simple check to find out if a given net was properly initialized */ 203#define nfsd_netns_ready(nn) ((nn)->sessionid_hashtbl) 204 205extern void nfsd_netns_free_versions(struct nfsd_net *nn); 206 207extern unsigned int nfsd_net_id; 208 209void nfsd_copy_write_verifier(__be32 verf[2], struct nfsd_net *nn); 210void nfsd_reset_write_verifier(struct nfsd_net *nn); 211#endif /* __NFSD_NETNS_H__ */ 212