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 24 struct cld_net; 25 struct nfsd4_client_tracking_ops; 26 27 enum { 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 */ 43 struct 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_info nfsd_info; 127 #define nfsd_serv nfsd_info.serv 128 129 130 /* 131 * clientid and stateid data for construction of net unique COPY 132 * stateids. 133 */ 134 u32 s2s_cp_cl_id; 135 struct idr s2s_cp_stateids; 136 spinlock_t s2s_cp_lock; 137 138 /* 139 * Version information 140 */ 141 bool *nfsd_versions; 142 bool *nfsd4_minorversions; 143 144 /* 145 * Duplicate reply cache 146 */ 147 struct nfsd_drc_bucket *drc_hashtbl; 148 149 /* max number of entries allowed in the cache */ 150 unsigned int max_drc_entries; 151 152 /* number of significant bits in the hash value */ 153 unsigned int maskbits; 154 unsigned int drc_hashsize; 155 156 /* 157 * Stats and other tracking of on the duplicate reply cache. 158 * The longest_chain* fields are modified with only the per-bucket 159 * cache lock, which isn't really safe and should be fixed if we want 160 * these statistics to be completely accurate. 161 */ 162 163 /* total number of entries */ 164 atomic_t num_drc_entries; 165 166 /* Per-netns stats counters */ 167 struct percpu_counter counter[NFSD_NET_COUNTERS_NUM]; 168 169 /* longest hash chain seen */ 170 unsigned int longest_chain; 171 172 /* size of cache when we saw the longest hash chain */ 173 unsigned int longest_chain_cachesize; 174 175 struct shrinker *nfsd_reply_cache_shrinker; 176 177 /* tracking server-to-server copy mounts */ 178 spinlock_t nfsd_ssc_lock; 179 struct list_head nfsd_ssc_mount_list; 180 wait_queue_head_t nfsd_ssc_waitq; 181 182 /* utsname taken from the process that starts the server */ 183 char nfsd_name[UNX_MAXNODENAME+1]; 184 185 struct nfsd_fcache_disposal *fcache_disposal; 186 187 siphash_key_t siphash_key; 188 189 atomic_t nfs4_client_count; 190 int nfs4_max_clients; 191 192 atomic_t nfsd_courtesy_clients; 193 struct shrinker *nfsd_client_shrinker; 194 struct work_struct nfsd_shrinker_work; 195 }; 196 197 /* Simple check to find out if a given net was properly initialized */ 198 #define nfsd_netns_ready(nn) ((nn)->sessionid_hashtbl) 199 200 extern void nfsd_netns_free_versions(struct nfsd_net *nn); 201 202 extern unsigned int nfsd_net_id; 203 204 void nfsd_copy_write_verifier(__be32 verf[2], struct nfsd_net *nn); 205 void nfsd_reset_write_verifier(struct nfsd_net *nn); 206 #endif /* __NFSD_NETNS_H__ */ 207