1 /* SPDX-License-Identifier: GPL-2.0-or-later */
3 * per net namespace data structures for nfsd
8 #ifndef __NFSD_NETNS_H__
9 #define __NFSD_NETNS_H__
11 #include <net/net_namespace.h>
12 #include <net/netns/generic.h>
13 #include <linux/percpu_counter.h>
14 #include <linux/siphash.h>
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)
21 #define SESSION_HASH_SIZE 512
24 struct nfsd4_client_tracking_ops;
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,
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.
39 * Each nfsd_net runs a nfs4_laundromat workqueue job when necessary to clean
40 * up expired clients and delegations within the container.
43 struct cld_net *cld_net;
45 struct cache_detail *svc_expkey_cache;
46 struct cache_detail *svc_export_cache;
48 struct cache_detail *idtoname_cache;
49 struct cache_detail *nametoid_cache;
51 struct lock_manager nfsd4_manager;
55 struct dentry *nfsd_client_dir;
58 * reclaim_str_hashtbl[] holds known client info from previous reset/reboot
59 * used in reboot/reset lease grace period processing
61 * conf_id_hashtbl[], and conf_name_tree hold confirmed
62 * setclientid_confirmed info.
64 * unconf_str_hastbl[] and unconf_name_tree hold unconfirmed
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;
75 * client_lru holds client queue ordered by nfs4_client.cl_time
78 * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
79 * for last close replay.
81 * All of the above fields are protected by the client_mutex.
83 struct list_head client_lru;
84 struct list_head close_lru;
85 struct list_head del_recall_lru;
87 /* protected by blocked_locks_lock */
88 struct list_head blocked_locks_lru;
90 struct delayed_work laundromat_work;
92 /* client_lock protects the client lru list and session hash table */
93 spinlock_t client_lock;
95 /* protects blocked_locks_lru */
96 spinlock_t blocked_locks_lock;
98 struct file *rec_file;
100 const struct nfsd4_client_tracking_ops *client_tracking_ops;
102 time64_t nfsd4_lease;
103 time64_t nfsd4_grace;
104 bool somebody_reclaimed;
106 bool track_reclaim_completes;
107 atomic_t nr_reclaim_complete;
112 seqlock_t writeverf_lock;
113 unsigned char writeverf[8];
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.
119 unsigned int max_connections;
122 u32 clientid_counter;
123 u32 clverifier_counter;
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.
135 * clientid and stateid data for construction of net unique COPY
139 struct idr s2s_cp_stateids;
140 spinlock_t s2s_cp_lock;
143 * Version information
146 bool *nfsd4_minorversions;
149 * Duplicate reply cache
151 struct nfsd_drc_bucket *drc_hashtbl;
153 /* max number of entries allowed in the cache */
154 unsigned int max_drc_entries;
156 /* number of significant bits in the hash value */
157 unsigned int maskbits;
158 unsigned int drc_hashsize;
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.
167 /* total number of entries */
168 atomic_t num_drc_entries;
170 /* Per-netns stats counters */
171 struct percpu_counter counter[NFSD_NET_COUNTERS_NUM];
173 /* longest hash chain seen */
174 unsigned int longest_chain;
176 /* size of cache when we saw the longest hash chain */
177 unsigned int longest_chain_cachesize;
179 struct shrinker nfsd_reply_cache_shrinker;
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;
186 /* utsname taken from the process that starts the server */
187 char nfsd_name[UNX_MAXNODENAME+1];
189 struct nfsd_fcache_disposal *fcache_disposal;
191 siphash_key_t siphash_key;
194 /* Simple check to find out if a given net was properly initialized */
195 #define nfsd_netns_ready(nn) ((nn)->sessionid_hashtbl)
197 extern void nfsd_netns_free_versions(struct nfsd_net *nn);
199 extern unsigned int nfsd_net_id;
201 void nfsd_copy_write_verifier(__be32 verf[2], struct nfsd_net *nn);
202 void nfsd_reset_write_verifier(struct nfsd_net *nn);
203 #endif /* __NFSD_NETNS_H__ */