fs/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
  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         time64_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         time64_t nfsd4_lease;
  96         time64_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
 143         /* max number of entries allowed in the cache */
 144         unsigned int             max_drc_entries;
 145
 146         /* number of significant bits in the hash value */
 147         unsigned int             maskbits;
 148         unsigned int             drc_hashsize;
 149
 150         /*
 151          * Stats and other tracking of on the duplicate reply cache.
 152          * These fields and the "rc" fields in nfsdstats are modified
 153          * with only the per-bucket cache lock, which isn't really safe
 154          * and should be fixed if we want the statistics to be
 155          * completely accurate.
 156          */
 157
 158         /* total number of entries */
 159         atomic_t                 num_drc_entries;
 160
 161         /* cache misses due only to checksum comparison failures */
 162         unsigned int             payload_misses;
 163
 164         /* amount of memory (in bytes) currently consumed by the DRC */
 165         unsigned int             drc_mem_usage;
 166
 167         /* longest hash chain seen */
 168         unsigned int             longest_chain;
 169
 170         /* size of cache when we saw the longest hash chain */
 171         unsigned int             longest_chain_cachesize;
 172
 173         struct shrinker         nfsd_reply_cache_shrinker;
 174         /* utsname taken from the the process that starts the server */
 175         char                    nfsd_name[UNX_MAXNODENAME+1];
 176 };
 177
 178 /* Simple check to find out if a given net was properly initialized */
 179 #define nfsd_netns_ready(nn) ((nn)->sessionid_hashtbl)
 180
 181 extern void nfsd_netns_free_versions(struct nfsd_net *nn);
 182
 183 extern unsigned int nfsd_net_id;
 184
 185 void nfsd_copy_boot_verifier(__be32 verf[2], struct nfsd_net *nn);
 186 void nfsd_reset_boot_verifier(struct nfsd_net *nn);
 187 #endif /* __NFSD_NETNS_H__ */