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1/*
2 * per net namespace data structures for nfsd
3 *
4 * Copyright (C) 2012, Jeff Layton <jlayton@redhat.com>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the Free
8 * Software Foundation; either version 2 of the License, or (at your option)
9 * any later version.
10 *
11 * This program is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * more details.
15 *
16 * You should have received a copy of the GNU General Public License along with
17 * this program; if not, write to the Free Software Foundation, Inc., 51
18 * Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
19 */
20
21#ifndef __NFSD_NETNS_H__
22#define __NFSD_NETNS_H__
23
24#include <net/net_namespace.h>
25#include <net/netns/generic.h>
26
27struct cld_net;
28
29struct nfsd_net {
30 struct cld_net *cld_net;
31
32 struct cache_detail *svc_expkey_cache;
33 struct cache_detail *svc_export_cache;
34
35 struct cache_detail *idtoname_cache;
36 struct cache_detail *nametoid_cache;
37};
38
39extern int nfsd_net_id;
40#endif /* __NFSD_NETNS_H__ */
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
15/* Hash tables for nfs4_clientid state */
16#define CLIENT_HASH_BITS 4
17#define CLIENT_HASH_SIZE (1 << CLIENT_HASH_BITS)
18#define CLIENT_HASH_MASK (CLIENT_HASH_SIZE - 1)
19
20#define SESSION_HASH_SIZE 512
21
22struct cld_net;
23struct nfsd4_client_tracking_ops;
24
25enum {
26 /* cache misses due only to checksum comparison failures */
27 NFSD_NET_PAYLOAD_MISSES,
28 /* amount of memory (in bytes) currently consumed by the DRC */
29 NFSD_NET_DRC_MEM_USAGE,
30 NFSD_NET_COUNTERS_NUM
31};
32
33/*
34 * Represents a nfsd "container". With respect to nfsv4 state tracking, the
35 * fields of interest are the *_id_hashtbls and the *_name_tree. These track
36 * the nfs4_client objects by either short or long form clientid.
37 *
38 * Each nfsd_net runs a nfs4_laundromat workqueue job when necessary to clean
39 * up expired clients and delegations within the container.
40 */
41struct nfsd_net {
42 struct cld_net *cld_net;
43
44 struct cache_detail *svc_expkey_cache;
45 struct cache_detail *svc_export_cache;
46
47 struct cache_detail *idtoname_cache;
48 struct cache_detail *nametoid_cache;
49
50 struct lock_manager nfsd4_manager;
51 bool grace_ended;
52 time64_t boot_time;
53
54 struct dentry *nfsd_client_dir;
55
56 /*
57 * reclaim_str_hashtbl[] holds known client info from previous reset/reboot
58 * used in reboot/reset lease grace period processing
59 *
60 * conf_id_hashtbl[], and conf_name_tree hold confirmed
61 * setclientid_confirmed info.
62 *
63 * unconf_str_hastbl[] and unconf_name_tree hold unconfirmed
64 * setclientid info.
65 */
66 struct list_head *reclaim_str_hashtbl;
67 int reclaim_str_hashtbl_size;
68 struct list_head *conf_id_hashtbl;
69 struct rb_root conf_name_tree;
70 struct list_head *unconf_id_hashtbl;
71 struct rb_root unconf_name_tree;
72 struct list_head *sessionid_hashtbl;
73 /*
74 * client_lru holds client queue ordered by nfs4_client.cl_time
75 * for lease renewal.
76 *
77 * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
78 * for last close replay.
79 *
80 * All of the above fields are protected by the client_mutex.
81 */
82 struct list_head client_lru;
83 struct list_head close_lru;
84 struct list_head del_recall_lru;
85
86 /* protected by blocked_locks_lock */
87 struct list_head blocked_locks_lru;
88
89 struct delayed_work laundromat_work;
90
91 /* client_lock protects the client lru list and session hash table */
92 spinlock_t client_lock;
93
94 /* protects blocked_locks_lru */
95 spinlock_t blocked_locks_lock;
96
97 struct file *rec_file;
98 bool in_grace;
99 const struct nfsd4_client_tracking_ops *client_tracking_ops;
100
101 time64_t nfsd4_lease;
102 time64_t nfsd4_grace;
103 bool somebody_reclaimed;
104
105 bool track_reclaim_completes;
106 atomic_t nr_reclaim_complete;
107
108 bool nfsd_net_up;
109 bool lockd_up;
110
111 /* Time of server startup */
112 struct timespec64 nfssvc_boot;
113 seqlock_t boot_lock;
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
127 wait_queue_head_t ntf_wq;
128 atomic_t ntf_refcnt;
129
130 /* Allow umount to wait for nfsd state cleanup */
131 struct completion nfsd_shutdown_complete;
132
133 /*
134 * clientid and stateid data for construction of net unique COPY
135 * stateids.
136 */
137 u32 s2s_cp_cl_id;
138 struct idr s2s_cp_stateids;
139 spinlock_t s2s_cp_lock;
140
141 /*
142 * Version information
143 */
144 bool *nfsd_versions;
145 bool *nfsd4_minorversions;
146
147 /*
148 * Duplicate reply cache
149 */
150 struct nfsd_drc_bucket *drc_hashtbl;
151
152 /* max number of entries allowed in the cache */
153 unsigned int max_drc_entries;
154
155 /* number of significant bits in the hash value */
156 unsigned int maskbits;
157 unsigned int drc_hashsize;
158
159 /*
160 * Stats and other tracking of on the duplicate reply cache.
161 * The longest_chain* fields are modified with only the per-bucket
162 * cache lock, which isn't really safe and should be fixed if we want
163 * these statistics to be completely accurate.
164 */
165
166 /* total number of entries */
167 atomic_t num_drc_entries;
168
169 /* Per-netns stats counters */
170 struct percpu_counter counter[NFSD_NET_COUNTERS_NUM];
171
172 /* longest hash chain seen */
173 unsigned int longest_chain;
174
175 /* size of cache when we saw the longest hash chain */
176 unsigned int longest_chain_cachesize;
177
178 struct shrinker nfsd_reply_cache_shrinker;
179
180 /* tracking server-to-server copy mounts */
181 spinlock_t nfsd_ssc_lock;
182 struct list_head nfsd_ssc_mount_list;
183 wait_queue_head_t nfsd_ssc_waitq;
184
185 /* utsname taken from the process that starts the server */
186 char nfsd_name[UNX_MAXNODENAME+1];
187};
188
189/* Simple check to find out if a given net was properly initialized */
190#define nfsd_netns_ready(nn) ((nn)->sessionid_hashtbl)
191
192extern void nfsd_netns_free_versions(struct nfsd_net *nn);
193
194extern unsigned int nfsd_net_id;
195
196void nfsd_copy_boot_verifier(__be32 verf[2], struct nfsd_net *nn);
197void nfsd_reset_boot_verifier(struct nfsd_net *nn);
198#endif /* __NFSD_NETNS_H__ */