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/percpu_counter.h> 14 #include <linux/siphash.h> 15 16 /* Hash tables for nfs4_clientid state */ 17 #define CLIENT_HASH_BITS 4 18 #define CLIENT_HASH_SIZE (1 << CLIENT_HASH_BITS) 19 #define CLIENT_HASH_MASK (CLIENT_HASH_SIZE - 1) 20 21 #define SESSION_HASH_SIZE 512 22 23 struct cld_net; 24 struct nfsd4_client_tracking_ops; 25 26 enum { 27 /* cache misses due only to checksum comparison failures */ 28 NFSD_NET_PAYLOAD_MISSES, 29 /* amount of memory (in bytes) currently consumed by the DRC */ 30 NFSD_NET_DRC_MEM_USAGE, 31 NFSD_NET_COUNTERS_NUM 32 }; 33 34 /* 35 * Represents a nfsd "container". With respect to nfsv4 state tracking, the 36 * fields of interest are the *_id_hashtbls and the *_name_tree. These track 37 * the nfs4_client objects by either short or long form clientid. 38 * 39 * Each nfsd_net runs a nfs4_laundromat workqueue job when necessary to clean 40 * up expired clients and delegations within the container. 41 */ 42 struct nfsd_net { 43 struct cld_net *cld_net; 44 45 struct cache_detail *svc_expkey_cache; 46 struct cache_detail *svc_export_cache; 47 48 struct cache_detail *idtoname_cache; 49 struct cache_detail *nametoid_cache; 50 51 struct lock_manager nfsd4_manager; 52 bool grace_ended; 53 time64_t boot_time; 54 55 struct dentry *nfsd_client_dir; 56 57 /* 58 * reclaim_str_hashtbl[] holds known client info from previous reset/reboot 59 * used in reboot/reset lease grace period processing 60 * 61 * conf_id_hashtbl[], and conf_name_tree hold confirmed 62 * setclientid_confirmed info. 63 * 64 * unconf_str_hastbl[] and unconf_name_tree hold unconfirmed 65 * setclientid info. 66 */ 67 struct list_head *reclaim_str_hashtbl; 68 int reclaim_str_hashtbl_size; 69 struct list_head *conf_id_hashtbl; 70 struct rb_root conf_name_tree; 71 struct list_head *unconf_id_hashtbl; 72 struct rb_root unconf_name_tree; 73 struct list_head *sessionid_hashtbl; 74 /* 75 * client_lru holds client queue ordered by nfs4_client.cl_time 76 * for lease renewal. 77 * 78 * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time 79 * for last close replay. 80 * 81 * All of the above fields are protected by the client_mutex. 82 */ 83 struct list_head client_lru; 84 struct list_head close_lru; 85 struct list_head del_recall_lru; 86 87 /* protected by blocked_locks_lock */ 88 struct list_head blocked_locks_lru; 89 90 struct delayed_work laundromat_work; 91 92 /* client_lock protects the client lru list and session hash table */ 93 spinlock_t client_lock; 94 95 /* protects blocked_locks_lru */ 96 spinlock_t blocked_locks_lock; 97 98 struct file *rec_file; 99 bool in_grace; 100 const struct nfsd4_client_tracking_ops *client_tracking_ops; 101 102 time64_t nfsd4_lease; 103 time64_t nfsd4_grace; 104 bool somebody_reclaimed; 105 106 bool track_reclaim_completes; 107 atomic_t nr_reclaim_complete; 108 109 bool nfsd_net_up; 110 bool lockd_up; 111 112 seqlock_t writeverf_lock; 113 unsigned char writeverf[8]; 114 115 /* 116 * Max number of connections this nfsd container will allow. Defaults 117 * to '0' which is means that it bases this on the number of threads. 118 */ 119 unsigned int max_connections; 120 121 u32 clientid_base; 122 u32 clientid_counter; 123 u32 clverifier_counter; 124 125 struct svc_serv *nfsd_serv; 126 /* When a listening socket is added to nfsd, keep_active is set 127 * and this justifies a reference on nfsd_serv. This stops 128 * nfsd_serv from being freed. When the number of threads is 129 * set, keep_active is cleared and the reference is dropped. So 130 * when the last thread exits, the service will be destroyed. 131 */ 132 int keep_active; 133 134 /* 135 * clientid and stateid data for construction of net unique COPY 136 * stateids. 137 */ 138 u32 s2s_cp_cl_id; 139 struct idr s2s_cp_stateids; 140 spinlock_t s2s_cp_lock; 141 142 /* 143 * Version information 144 */ 145 bool *nfsd_versions; 146 bool *nfsd4_minorversions; 147 148 /* 149 * Duplicate reply cache 150 */ 151 struct nfsd_drc_bucket *drc_hashtbl; 152 153 /* max number of entries allowed in the cache */ 154 unsigned int max_drc_entries; 155 156 /* number of significant bits in the hash value */ 157 unsigned int maskbits; 158 unsigned int drc_hashsize; 159 160 /* 161 * Stats and other tracking of on the duplicate reply cache. 162 * The longest_chain* fields are modified with only the per-bucket 163 * cache lock, which isn't really safe and should be fixed if we want 164 * these statistics to be completely accurate. 165 */ 166 167 /* total number of entries */ 168 atomic_t num_drc_entries; 169 170 /* Per-netns stats counters */ 171 struct percpu_counter counter[NFSD_NET_COUNTERS_NUM]; 172 173 /* longest hash chain seen */ 174 unsigned int longest_chain; 175 176 /* size of cache when we saw the longest hash chain */ 177 unsigned int longest_chain_cachesize; 178 179 struct shrinker nfsd_reply_cache_shrinker; 180 181 /* tracking server-to-server copy mounts */ 182 spinlock_t nfsd_ssc_lock; 183 struct list_head nfsd_ssc_mount_list; 184 wait_queue_head_t nfsd_ssc_waitq; 185 186 /* utsname taken from the process that starts the server */ 187 char nfsd_name[UNX_MAXNODENAME+1]; 188 189 struct nfsd_fcache_disposal *fcache_disposal; 190 191 siphash_key_t siphash_key; 192 193 atomic_t nfs4_client_count; 194 int nfs4_max_clients; 195 196 atomic_t nfsd_courtesy_clients; 197 struct shrinker nfsd_client_shrinker; 198 struct delayed_work nfsd_shrinker_work; 199 }; 200 201 /* Simple check to find out if a given net was properly initialized */ 202 #define nfsd_netns_ready(nn) ((nn)->sessionid_hashtbl) 203 204 extern void nfsd_netns_free_versions(struct nfsd_net *nn); 205 206 extern unsigned int nfsd_net_id; 207 208 void nfsd_copy_write_verifier(__be32 verf[2], struct nfsd_net *nn); 209 void nfsd_reset_write_verifier(struct nfsd_net *nn); 210 #endif /* __NFSD_NETNS_H__ */ 211