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 14 /* Hash tables for nfs4_clientid state */ 15 #define CLIENT_HASH_BITS 4 16 #define CLIENT_HASH_SIZE (1 << CLIENT_HASH_BITS) 17 #define CLIENT_HASH_MASK (CLIENT_HASH_SIZE - 1) 18 19 #define SESSION_HASH_SIZE 512 20 21 struct cld_net; 22 struct nfsd4_client_tracking_ops; 23 24 /* 25 * Represents a nfsd "container". With respect to nfsv4 state tracking, the 26 * fields of interest are the *_id_hashtbls and the *_name_tree. These track 27 * the nfs4_client objects by either short or long form clientid. 28 * 29 * Each nfsd_net runs a nfs4_laundromat workqueue job when necessary to clean 30 * up expired clients and delegations within the container. 31 */ 32 struct nfsd_net { 33 struct cld_net *cld_net; 34 35 struct cache_detail *svc_expkey_cache; 36 struct cache_detail *svc_export_cache; 37 38 struct cache_detail *idtoname_cache; 39 struct cache_detail *nametoid_cache; 40 41 struct lock_manager nfsd4_manager; 42 bool grace_ended; 43 time_t boot_time; 44 45 /* internal mount of the "nfsd" pseudofilesystem: */ 46 struct vfsmount *nfsd_mnt; 47 48 struct dentry *nfsd_client_dir; 49 50 /* 51 * reclaim_str_hashtbl[] holds known client info from previous reset/reboot 52 * used in reboot/reset lease grace period processing 53 * 54 * conf_id_hashtbl[], and conf_name_tree hold confirmed 55 * setclientid_confirmed info. 56 * 57 * unconf_str_hastbl[] and unconf_name_tree hold unconfirmed 58 * setclientid info. 59 */ 60 struct list_head *reclaim_str_hashtbl; 61 int reclaim_str_hashtbl_size; 62 struct list_head *conf_id_hashtbl; 63 struct rb_root conf_name_tree; 64 struct list_head *unconf_id_hashtbl; 65 struct rb_root unconf_name_tree; 66 struct list_head *sessionid_hashtbl; 67 /* 68 * client_lru holds client queue ordered by nfs4_client.cl_time 69 * for lease renewal. 70 * 71 * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time 72 * for last close replay. 73 * 74 * All of the above fields are protected by the client_mutex. 75 */ 76 struct list_head client_lru; 77 struct list_head close_lru; 78 struct list_head del_recall_lru; 79 80 /* protected by blocked_locks_lock */ 81 struct list_head blocked_locks_lru; 82 83 struct delayed_work laundromat_work; 84 85 /* client_lock protects the client lru list and session hash table */ 86 spinlock_t client_lock; 87 88 /* protects blocked_locks_lru */ 89 spinlock_t blocked_locks_lock; 90 91 struct file *rec_file; 92 bool in_grace; 93 const struct nfsd4_client_tracking_ops *client_tracking_ops; 94 95 time_t nfsd4_lease; 96 time_t nfsd4_grace; 97 bool somebody_reclaimed; 98 99 bool track_reclaim_completes; 100 atomic_t nr_reclaim_complete; 101 102 bool nfsd_net_up; 103 bool lockd_up; 104 105 /* Time of server startup */ 106 struct timespec64 nfssvc_boot; 107 seqlock_t boot_lock; 108 109 /* 110 * Max number of connections this nfsd container will allow. Defaults 111 * to '0' which is means that it bases this on the number of threads. 112 */ 113 unsigned int max_connections; 114 115 u32 clientid_base; 116 u32 clientid_counter; 117 u32 clverifier_counter; 118 119 struct svc_serv *nfsd_serv; 120 121 wait_queue_head_t ntf_wq; 122 atomic_t ntf_refcnt; 123 124 /* 125 * clientid and stateid data for construction of net unique COPY 126 * stateids. 127 */ 128 u32 s2s_cp_cl_id; 129 struct idr s2s_cp_stateids; 130 spinlock_t s2s_cp_lock; 131 132 /* 133 * Version information 134 */ 135 bool *nfsd_versions; 136 bool *nfsd4_minorversions; 137 138 /* 139 * Duplicate reply cache 140 */ 141 struct nfsd_drc_bucket *drc_hashtbl; 142 struct kmem_cache *drc_slab; 143 144 /* max number of entries allowed in the cache */ 145 unsigned int max_drc_entries; 146 147 /* number of significant bits in the hash value */ 148 unsigned int maskbits; 149 unsigned int drc_hashsize; 150 151 /* 152 * Stats and other tracking of on the duplicate reply cache. 153 * These fields and the "rc" fields in nfsdstats are modified 154 * with only the per-bucket cache lock, which isn't really safe 155 * and should be fixed if we want the statistics to be 156 * completely accurate. 157 */ 158 159 /* total number of entries */ 160 atomic_t num_drc_entries; 161 162 /* cache misses due only to checksum comparison failures */ 163 unsigned int payload_misses; 164 165 /* amount of memory (in bytes) currently consumed by the DRC */ 166 unsigned int drc_mem_usage; 167 168 /* longest hash chain seen */ 169 unsigned int longest_chain; 170 171 /* size of cache when we saw the longest hash chain */ 172 unsigned int longest_chain_cachesize; 173 174 struct shrinker nfsd_reply_cache_shrinker; 175 }; 176 177 /* Simple check to find out if a given net was properly initialized */ 178 #define nfsd_netns_ready(nn) ((nn)->sessionid_hashtbl) 179 180 extern void nfsd_netns_free_versions(struct nfsd_net *nn); 181 182 extern unsigned int nfsd_net_id; 183 184 void nfsd_copy_boot_verifier(__be32 verf[2], struct nfsd_net *nn); 185 void nfsd_reset_boot_verifier(struct nfsd_net *nn); 186 #endif /* __NFSD_NETNS_H__ */ 187