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/nfs4.h> 15 #include <linux/percpu_counter.h> 16 #include <linux/siphash.h> 17 #include <linux/sunrpc/stats.h> 18 19 /* Hash tables for nfs4_clientid state */ 20 #define CLIENT_HASH_BITS 4 21 #define CLIENT_HASH_SIZE (1 << CLIENT_HASH_BITS) 22 #define CLIENT_HASH_MASK (CLIENT_HASH_SIZE - 1) 23 24 #define SESSION_HASH_SIZE 512 25 26 struct cld_net; 27 struct nfsd4_client_tracking_ops; 28 29 enum { 30 /* cache misses due only to checksum comparison failures */ 31 NFSD_STATS_PAYLOAD_MISSES, 32 /* amount of memory (in bytes) currently consumed by the DRC */ 33 NFSD_STATS_DRC_MEM_USAGE, 34 NFSD_STATS_RC_HITS, /* repcache hits */ 35 NFSD_STATS_RC_MISSES, /* repcache misses */ 36 NFSD_STATS_RC_NOCACHE, /* uncached reqs */ 37 NFSD_STATS_FH_STALE, /* FH stale error */ 38 NFSD_STATS_IO_READ, /* bytes returned to read requests */ 39 NFSD_STATS_IO_WRITE, /* bytes passed in write requests */ 40 #ifdef CONFIG_NFSD_V4 41 NFSD_STATS_FIRST_NFS4_OP, /* count of individual nfsv4 operations */ 42 NFSD_STATS_LAST_NFS4_OP = NFSD_STATS_FIRST_NFS4_OP + LAST_NFS4_OP, 43 #define NFSD_STATS_NFS4_OP(op) (NFSD_STATS_FIRST_NFS4_OP + (op)) 44 NFSD_STATS_WDELEG_GETATTR, /* count of getattr conflict with wdeleg */ 45 #endif 46 NFSD_STATS_COUNTERS_NUM 47 }; 48 49 /* 50 * Represents a nfsd "container". With respect to nfsv4 state tracking, the 51 * fields of interest are the *_id_hashtbls and the *_name_tree. These track 52 * the nfs4_client objects by either short or long form clientid. 53 * 54 * Each nfsd_net runs a nfs4_laundromat workqueue job when necessary to clean 55 * up expired clients and delegations within the container. 56 */ 57 struct nfsd_net { 58 struct cld_net *cld_net; 59 60 struct cache_detail *svc_expkey_cache; 61 struct cache_detail *svc_export_cache; 62 63 struct cache_detail *idtoname_cache; 64 struct cache_detail *nametoid_cache; 65 66 struct lock_manager nfsd4_manager; 67 bool grace_ended; 68 time64_t boot_time; 69 70 struct dentry *nfsd_client_dir; 71 72 /* 73 * reclaim_str_hashtbl[] holds known client info from previous reset/reboot 74 * used in reboot/reset lease grace period processing 75 * 76 * conf_id_hashtbl[], and conf_name_tree hold confirmed 77 * setclientid_confirmed info. 78 * 79 * unconf_str_hastbl[] and unconf_name_tree hold unconfirmed 80 * setclientid info. 81 */ 82 struct list_head *reclaim_str_hashtbl; 83 int reclaim_str_hashtbl_size; 84 struct list_head *conf_id_hashtbl; 85 struct rb_root conf_name_tree; 86 struct list_head *unconf_id_hashtbl; 87 struct rb_root unconf_name_tree; 88 struct list_head *sessionid_hashtbl; 89 /* 90 * client_lru holds client queue ordered by nfs4_client.cl_time 91 * for lease renewal. 92 * 93 * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time 94 * for last close replay. 95 * 96 * All of the above fields are protected by the client_mutex. 97 */ 98 struct list_head client_lru; 99 struct list_head close_lru; 100 struct list_head del_recall_lru; 101 102 /* protected by blocked_locks_lock */ 103 struct list_head blocked_locks_lru; 104 105 struct delayed_work laundromat_work; 106 107 /* client_lock protects the client lru list and session hash table */ 108 spinlock_t client_lock; 109 110 /* protects blocked_locks_lru */ 111 spinlock_t blocked_locks_lock; 112 113 struct file *rec_file; 114 bool in_grace; 115 const struct nfsd4_client_tracking_ops *client_tracking_ops; 116 117 time64_t nfsd4_lease; 118 time64_t nfsd4_grace; 119 bool somebody_reclaimed; 120 121 bool track_reclaim_completes; 122 atomic_t nr_reclaim_complete; 123 124 bool nfsd_net_up; 125 bool lockd_up; 126 127 seqlock_t writeverf_lock; 128 unsigned char writeverf[8]; 129 130 /* 131 * Max number of connections this nfsd container will allow. Defaults 132 * to '0' which is means that it bases this on the number of threads. 133 */ 134 unsigned int max_connections; 135 136 u32 clientid_base; 137 u32 clientid_counter; 138 u32 clverifier_counter; 139 140 struct svc_info nfsd_info; 141 #define nfsd_serv nfsd_info.serv 142 143 144 /* 145 * clientid and stateid data for construction of net unique COPY 146 * stateids. 147 */ 148 u32 s2s_cp_cl_id; 149 struct idr s2s_cp_stateids; 150 spinlock_t s2s_cp_lock; 151 152 /* 153 * Version information 154 */ 155 bool *nfsd_versions; 156 bool *nfsd4_minorversions; 157 158 /* 159 * Duplicate reply cache 160 */ 161 struct nfsd_drc_bucket *drc_hashtbl; 162 163 /* max number of entries allowed in the cache */ 164 unsigned int max_drc_entries; 165 166 /* number of significant bits in the hash value */ 167 unsigned int maskbits; 168 unsigned int drc_hashsize; 169 170 /* 171 * Stats and other tracking of on the duplicate reply cache. 172 * The longest_chain* fields are modified with only the per-bucket 173 * cache lock, which isn't really safe and should be fixed if we want 174 * these statistics to be completely accurate. 175 */ 176 177 /* total number of entries */ 178 atomic_t num_drc_entries; 179 180 /* Per-netns stats counters */ 181 struct percpu_counter counter[NFSD_STATS_COUNTERS_NUM]; 182 183 /* sunrpc svc stats */ 184 struct svc_stat nfsd_svcstats; 185 186 /* longest hash chain seen */ 187 unsigned int longest_chain; 188 189 /* size of cache when we saw the longest hash chain */ 190 unsigned int longest_chain_cachesize; 191 192 struct shrinker *nfsd_reply_cache_shrinker; 193 194 /* tracking server-to-server copy mounts */ 195 spinlock_t nfsd_ssc_lock; 196 struct list_head nfsd_ssc_mount_list; 197 wait_queue_head_t nfsd_ssc_waitq; 198 199 /* utsname taken from the process that starts the server */ 200 char nfsd_name[UNX_MAXNODENAME+1]; 201 202 struct nfsd_fcache_disposal *fcache_disposal; 203 204 siphash_key_t siphash_key; 205 206 atomic_t nfs4_client_count; 207 int nfs4_max_clients; 208 209 atomic_t nfsd_courtesy_clients; 210 struct shrinker *nfsd_client_shrinker; 211 struct work_struct nfsd_shrinker_work; 212 213 /* last time an admin-revoke happened for NFSv4.0 */ 214 time64_t nfs40_last_revoke; 215 216 }; 217 218 /* Simple check to find out if a given net was properly initialized */ 219 #define nfsd_netns_ready(nn) ((nn)->sessionid_hashtbl) 220 221 extern bool nfsd_support_version(int vers); 222 extern void nfsd_netns_free_versions(struct nfsd_net *nn); 223 224 extern unsigned int nfsd_net_id; 225 226 void nfsd_copy_write_verifier(__be32 verf[2], struct nfsd_net *nn); 227 void nfsd_reset_write_verifier(struct nfsd_net *nn); 228 #endif /* __NFSD_NETNS_H__ */ 229