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/filelock.h>
14 #include <linux/nfs4.h>
15 #include <linux/percpu_counter.h>
16 #include <linux/siphash.h>
17 #include <linux/sunrpc/stats.h>
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)
24 #define SESSION_HASH_SIZE 512
27 struct nfsd4_client_tracking_ops;
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 */
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 */
46 NFSD_STATS_COUNTERS_NUM
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.
54 * Each nfsd_net runs a nfs4_laundromat workqueue job when necessary to clean
55 * up expired clients and delegations within the container.
58 struct cld_net *cld_net;
60 struct cache_detail *svc_expkey_cache;
61 struct cache_detail *svc_export_cache;
63 struct cache_detail *idtoname_cache;
64 struct cache_detail *nametoid_cache;
66 struct lock_manager nfsd4_manager;
70 struct dentry *nfsd_client_dir;
73 * reclaim_str_hashtbl[] holds known client info from previous reset/reboot
74 * used in reboot/reset lease grace period processing
76 * conf_id_hashtbl[], and conf_name_tree hold confirmed
77 * setclientid_confirmed info.
79 * unconf_str_hastbl[] and unconf_name_tree hold unconfirmed
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;
90 * client_lru holds client queue ordered by nfs4_client.cl_time
93 * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
94 * for last close replay.
96 * All of the above fields are protected by the client_mutex.
98 struct list_head client_lru;
99 struct list_head close_lru;
100 struct list_head del_recall_lru;
102 /* protected by blocked_locks_lock */
103 struct list_head blocked_locks_lru;
105 struct delayed_work laundromat_work;
107 /* client_lock protects the client lru list and session hash table */
108 spinlock_t client_lock;
110 /* protects blocked_locks_lru */
111 spinlock_t blocked_locks_lock;
113 struct file *rec_file;
115 const struct nfsd4_client_tracking_ops *client_tracking_ops;
117 time64_t nfsd4_lease;
118 time64_t nfsd4_grace;
119 bool somebody_reclaimed;
121 bool track_reclaim_completes;
122 atomic_t nr_reclaim_complete;
127 seqlock_t writeverf_lock;
128 unsigned char writeverf[8];
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.
134 unsigned int max_connections;
137 u32 clientid_counter;
138 u32 clverifier_counter;
140 struct svc_info nfsd_info;
141 #define nfsd_serv nfsd_info.serv
145 * clientid and stateid data for construction of net unique COPY
149 struct idr s2s_cp_stateids;
150 spinlock_t s2s_cp_lock;
153 * Version information
156 bool *nfsd4_minorversions;
159 * Duplicate reply cache
161 struct nfsd_drc_bucket *drc_hashtbl;
163 /* max number of entries allowed in the cache */
164 unsigned int max_drc_entries;
166 /* number of significant bits in the hash value */
167 unsigned int maskbits;
168 unsigned int drc_hashsize;
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.
177 /* total number of entries */
178 atomic_t num_drc_entries;
180 /* Per-netns stats counters */
181 struct percpu_counter counter[NFSD_STATS_COUNTERS_NUM];
183 /* sunrpc svc stats */
184 struct svc_stat nfsd_svcstats;
186 /* longest hash chain seen */
187 unsigned int longest_chain;
189 /* size of cache when we saw the longest hash chain */
190 unsigned int longest_chain_cachesize;
192 struct shrinker *nfsd_reply_cache_shrinker;
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;
199 /* utsname taken from the process that starts the server */
200 char nfsd_name[UNX_MAXNODENAME+1];
202 struct nfsd_fcache_disposal *fcache_disposal;
204 siphash_key_t siphash_key;
206 atomic_t nfs4_client_count;
207 int nfs4_max_clients;
209 atomic_t nfsd_courtesy_clients;
210 struct shrinker *nfsd_client_shrinker;
211 struct work_struct nfsd_shrinker_work;
213 /* last time an admin-revoke happened for NFSv4.0 */
214 time64_t nfs40_last_revoke;
218 /* Simple check to find out if a given net was properly initialized */
219 #define nfsd_netns_ready(nn) ((nn)->sessionid_hashtbl)
221 extern bool nfsd_support_version(int vers);
222 extern void nfsd_netns_free_versions(struct nfsd_net *nn);
224 extern unsigned int nfsd_net_id;
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__ */