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 #include <linux/filelock.h>
  14 #include <linux/nfs4.h>
  15 #include <linux/percpu_counter.h>
  16 #include <linux/percpu-refcount.h>
  17 #include <linux/siphash.h>
  18 #include <linux/sunrpc/stats.h>
  19
  20 /* Hash tables for nfs4_clientid state */
  21 #define CLIENT_HASH_BITS                 4
  22 #define CLIENT_HASH_SIZE                (1 << CLIENT_HASH_BITS)
  23 #define CLIENT_HASH_MASK                (CLIENT_HASH_SIZE - 1)
  24
  25 #define SESSION_HASH_SIZE       512
  26
  27 struct cld_net;
  28 struct nfsd4_client_tracking_ops;
  29
  30 enum {
  31         /* cache misses due only to checksum comparison failures */
  32         NFSD_STATS_PAYLOAD_MISSES,
  33         /* amount of memory (in bytes) currently consumed by the DRC */
  34         NFSD_STATS_DRC_MEM_USAGE,
  35         NFSD_STATS_RC_HITS,             /* repcache hits */
  36         NFSD_STATS_RC_MISSES,           /* repcache misses */
  37         NFSD_STATS_RC_NOCACHE,          /* uncached reqs */
  38         NFSD_STATS_FH_STALE,            /* FH stale error */
  39         NFSD_STATS_IO_READ,             /* bytes returned to read requests */
  40         NFSD_STATS_IO_WRITE,            /* bytes passed in write requests */
  41 #ifdef CONFIG_NFSD_V4
  42         NFSD_STATS_FIRST_NFS4_OP,       /* count of individual nfsv4 operations */
  43         NFSD_STATS_LAST_NFS4_OP = NFSD_STATS_FIRST_NFS4_OP + LAST_NFS4_OP,
  44 #define NFSD_STATS_NFS4_OP(op)  (NFSD_STATS_FIRST_NFS4_OP + (op))
  45         NFSD_STATS_WDELEG_GETATTR,      /* count of getattr conflict with wdeleg */
  46 #endif
  47         NFSD_STATS_COUNTERS_NUM
  48 };
  49
  50 /*
  51  * Represents a nfsd "container". With respect to nfsv4 state tracking, the
  52  * fields of interest are the *_id_hashtbls and the *_name_tree. These track
  53  * the nfs4_client objects by either short or long form clientid.
  54  *
  55  * Each nfsd_net runs a nfs4_laundromat workqueue job when necessary to clean
  56  * up expired clients and delegations within the container.
  57  */
  58 struct nfsd_net {
  59         struct cld_net *cld_net;
  60
  61         struct cache_detail *svc_expkey_cache;
  62         struct cache_detail *svc_export_cache;
  63
  64         struct cache_detail *idtoname_cache;
  65         struct cache_detail *nametoid_cache;
  66
  67         struct lock_manager nfsd4_manager;
  68         bool grace_ended;
  69         time64_t boot_time;
  70
  71         struct dentry *nfsd_client_dir;
  72
  73         /*
  74          * reclaim_str_hashtbl[] holds known client info from previous reset/reboot
  75          * used in reboot/reset lease grace period processing
  76          *
  77          * conf_id_hashtbl[], and conf_name_tree hold confirmed
  78          * setclientid_confirmed info.
  79          *
  80          * unconf_str_hastbl[] and unconf_name_tree hold unconfirmed
  81          * setclientid info.
  82          */
  83         struct list_head *reclaim_str_hashtbl;
  84         int reclaim_str_hashtbl_size;
  85         struct list_head *conf_id_hashtbl;
  86         struct rb_root conf_name_tree;
  87         struct list_head *unconf_id_hashtbl;
  88         struct rb_root unconf_name_tree;
  89         struct list_head *sessionid_hashtbl;
  90         /*
  91          * client_lru holds client queue ordered by nfs4_client.cl_time
  92          * for lease renewal.
  93          *
  94          * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
  95          * for last close replay.
  96          *
  97          * All of the above fields are protected by the client_mutex.
  98          */
  99         struct list_head client_lru;
 100         struct list_head close_lru;
 101         struct list_head del_recall_lru;
 102
 103         /* protected by blocked_locks_lock */
 104         struct list_head blocked_locks_lru;
 105
 106         struct delayed_work laundromat_work;
 107
 108         /* client_lock protects the client lru list and session hash table */
 109         spinlock_t client_lock;
 110
 111         /* protects blocked_locks_lru */
 112         spinlock_t blocked_locks_lock;
 113
 114         struct file *rec_file;
 115         bool in_grace;
 116         const struct nfsd4_client_tracking_ops *client_tracking_ops;
 117
 118         time64_t nfsd4_lease;
 119         time64_t nfsd4_grace;
 120         bool somebody_reclaimed;
 121
 122         bool track_reclaim_completes;
 123         atomic_t nr_reclaim_complete;
 124
 125         bool nfsd_net_up;
 126         bool lockd_up;
 127
 128         seqlock_t writeverf_lock;
 129         unsigned char writeverf[8];
 130
 131         u32 clientid_base;
 132         u32 clientid_counter;
 133         u32 clverifier_counter;
 134
 135         struct svc_info nfsd_info;
 136 #define nfsd_serv nfsd_info.serv
 137
 138         struct percpu_ref nfsd_net_ref;
 139         struct completion nfsd_net_confirm_done;
 140         struct completion nfsd_net_free_done;
 141
 142         /*
 143          * clientid and stateid data for construction of net unique COPY
 144          * stateids.
 145          */
 146         u32             s2s_cp_cl_id;
 147         struct idr      s2s_cp_stateids;
 148         spinlock_t      s2s_cp_lock;
 149         atomic_t        pending_async_copies;
 150
 151         /*
 152          * Version information
 153          */
 154         bool nfsd_versions[NFSD_MAXVERS + 1];
 155         bool nfsd4_minorversions[NFSD_SUPPORTED_MINOR_VERSION + 1];
 156
 157         /*
 158          * Duplicate reply cache
 159          */
 160         struct nfsd_drc_bucket   *drc_hashtbl;
 161
 162         /* max number of entries allowed in the cache */
 163         unsigned int             max_drc_entries;
 164
 165         /* number of significant bits in the hash value */
 166         unsigned int             maskbits;
 167         unsigned int             drc_hashsize;
 168
 169         /*
 170          * Stats and other tracking of on the duplicate reply cache.
 171          * The longest_chain* fields are modified with only the per-bucket
 172          * cache lock, which isn't really safe and should be fixed if we want
 173          * these statistics to be completely accurate.
 174          */
 175
 176         /* total number of entries */
 177         atomic_t                 num_drc_entries;
 178
 179         /* Per-netns stats counters */
 180         struct percpu_counter    counter[NFSD_STATS_COUNTERS_NUM];
 181
 182         /* sunrpc svc stats */
 183         struct svc_stat          nfsd_svcstats;
 184
 185         /* longest hash chain seen */
 186         unsigned int             longest_chain;
 187
 188         /* size of cache when we saw the longest hash chain */
 189         unsigned int             longest_chain_cachesize;
 190
 191         struct shrinker         *nfsd_reply_cache_shrinker;
 192
 193         /* tracking server-to-server copy mounts */
 194         spinlock_t              nfsd_ssc_lock;
 195         struct list_head        nfsd_ssc_mount_list;
 196         wait_queue_head_t       nfsd_ssc_waitq;
 197
 198         /* utsname taken from the process that starts the server */
 199         char                    nfsd_name[UNX_MAXNODENAME+1];
 200
 201         struct nfsd_fcache_disposal *fcache_disposal;
 202
 203         siphash_key_t           siphash_key;
 204
 205         atomic_t                nfs4_client_count;
 206         int                     nfs4_max_clients;
 207
 208         atomic_t                nfsd_courtesy_clients;
 209         struct shrinker         *nfsd_client_shrinker;
 210         struct work_struct      nfsd_shrinker_work;
 211
 212         /* last time an admin-revoke happened for NFSv4.0 */
 213         time64_t                nfs40_last_revoke;
 214
 215 #if IS_ENABLED(CONFIG_NFS_LOCALIO)
 216         /* Local clients to be invalidated when net is shut down */
 217         spinlock_t              local_clients_lock;
 218         struct list_head        local_clients;
 219 #endif
 220 };
 221
 222 /* Simple check to find out if a given net was properly initialized */
 223 #define nfsd_netns_ready(nn) ((nn)->sessionid_hashtbl)
 224
 225 extern bool nfsd_support_version(int vers);
 226 extern unsigned int nfsd_net_id;
 227
 228 bool nfsd_net_try_get(struct net *net);
 229 void nfsd_net_put(struct net *net);
 230
 231 void nfsd_copy_write_verifier(__be32 verf[2], struct nfsd_net *nn);
 232 void nfsd_reset_write_verifier(struct nfsd_net *nn);
 233 #endif /* __NFSD_NETNS_H__ */