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- /* SPDX-License-Identifier: GPL-2.0-or-later */
- /*
- * per net namespace data structures for nfsd
- *
- * Copyright (C) 2012, Jeff Layton <[email protected]>
- */
- #ifndef __NFSD_NETNS_H__
- #define __NFSD_NETNS_H__
- #include <net/net_namespace.h>
- #include <net/netns/generic.h>
- #include <linux/percpu_counter.h>
- #include <linux/siphash.h>
- /* Hash tables for nfs4_clientid state */
- #define CLIENT_HASH_BITS 4
- #define CLIENT_HASH_SIZE (1 << CLIENT_HASH_BITS)
- #define CLIENT_HASH_MASK (CLIENT_HASH_SIZE - 1)
- #define SESSION_HASH_SIZE 512
- struct cld_net;
- struct nfsd4_client_tracking_ops;
- enum {
- /* cache misses due only to checksum comparison failures */
- NFSD_NET_PAYLOAD_MISSES,
- /* amount of memory (in bytes) currently consumed by the DRC */
- NFSD_NET_DRC_MEM_USAGE,
- NFSD_NET_COUNTERS_NUM
- };
- /*
- * Represents a nfsd "container". With respect to nfsv4 state tracking, the
- * fields of interest are the *_id_hashtbls and the *_name_tree. These track
- * the nfs4_client objects by either short or long form clientid.
- *
- * Each nfsd_net runs a nfs4_laundromat workqueue job when necessary to clean
- * up expired clients and delegations within the container.
- */
- struct nfsd_net {
- struct cld_net *cld_net;
- struct cache_detail *svc_expkey_cache;
- struct cache_detail *svc_export_cache;
- struct cache_detail *idtoname_cache;
- struct cache_detail *nametoid_cache;
- struct lock_manager nfsd4_manager;
- bool grace_ended;
- time64_t boot_time;
- struct dentry *nfsd_client_dir;
- /*
- * reclaim_str_hashtbl[] holds known client info from previous reset/reboot
- * used in reboot/reset lease grace period processing
- *
- * conf_id_hashtbl[], and conf_name_tree hold confirmed
- * setclientid_confirmed info.
- *
- * unconf_str_hastbl[] and unconf_name_tree hold unconfirmed
- * setclientid info.
- */
- struct list_head *reclaim_str_hashtbl;
- int reclaim_str_hashtbl_size;
- struct list_head *conf_id_hashtbl;
- struct rb_root conf_name_tree;
- struct list_head *unconf_id_hashtbl;
- struct rb_root unconf_name_tree;
- struct list_head *sessionid_hashtbl;
- /*
- * client_lru holds client queue ordered by nfs4_client.cl_time
- * for lease renewal.
- *
- * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
- * for last close replay.
- *
- * All of the above fields are protected by the client_mutex.
- */
- struct list_head client_lru;
- struct list_head close_lru;
- struct list_head del_recall_lru;
- /* protected by blocked_locks_lock */
- struct list_head blocked_locks_lru;
- struct delayed_work laundromat_work;
- /* client_lock protects the client lru list and session hash table */
- spinlock_t client_lock;
- /* protects blocked_locks_lru */
- spinlock_t blocked_locks_lock;
- struct file *rec_file;
- bool in_grace;
- const struct nfsd4_client_tracking_ops *client_tracking_ops;
- time64_t nfsd4_lease;
- time64_t nfsd4_grace;
- bool somebody_reclaimed;
- bool track_reclaim_completes;
- atomic_t nr_reclaim_complete;
- bool nfsd_net_up;
- bool lockd_up;
- seqlock_t writeverf_lock;
- unsigned char writeverf[8];
- /*
- * Max number of connections this nfsd container will allow. Defaults
- * to '0' which is means that it bases this on the number of threads.
- */
- unsigned int max_connections;
- u32 clientid_base;
- u32 clientid_counter;
- u32 clverifier_counter;
- struct svc_serv *nfsd_serv;
- /* When a listening socket is added to nfsd, keep_active is set
- * and this justifies a reference on nfsd_serv. This stops
- * nfsd_serv from being freed. When the number of threads is
- * set, keep_active is cleared and the reference is dropped. So
- * when the last thread exits, the service will be destroyed.
- */
- int keep_active;
- /*
- * clientid and stateid data for construction of net unique COPY
- * stateids.
- */
- u32 s2s_cp_cl_id;
- struct idr s2s_cp_stateids;
- spinlock_t s2s_cp_lock;
- /*
- * Version information
- */
- bool *nfsd_versions;
- bool *nfsd4_minorversions;
- /*
- * Duplicate reply cache
- */
- struct nfsd_drc_bucket *drc_hashtbl;
- /* max number of entries allowed in the cache */
- unsigned int max_drc_entries;
- /* number of significant bits in the hash value */
- unsigned int maskbits;
- unsigned int drc_hashsize;
- /*
- * Stats and other tracking of on the duplicate reply cache.
- * The longest_chain* fields are modified with only the per-bucket
- * cache lock, which isn't really safe and should be fixed if we want
- * these statistics to be completely accurate.
- */
- /* total number of entries */
- atomic_t num_drc_entries;
- /* Per-netns stats counters */
- struct percpu_counter counter[NFSD_NET_COUNTERS_NUM];
- /* longest hash chain seen */
- unsigned int longest_chain;
- /* size of cache when we saw the longest hash chain */
- unsigned int longest_chain_cachesize;
- struct shrinker nfsd_reply_cache_shrinker;
- /* tracking server-to-server copy mounts */
- spinlock_t nfsd_ssc_lock;
- struct list_head nfsd_ssc_mount_list;
- wait_queue_head_t nfsd_ssc_waitq;
- /* utsname taken from the process that starts the server */
- char nfsd_name[UNX_MAXNODENAME+1];
- struct nfsd_fcache_disposal *fcache_disposal;
- siphash_key_t siphash_key;
- atomic_t nfs4_client_count;
- int nfs4_max_clients;
- atomic_t nfsd_courtesy_clients;
- struct shrinker nfsd_client_shrinker;
- struct delayed_work nfsd_shrinker_work;
- };
- /* Simple check to find out if a given net was properly initialized */
- #define nfsd_netns_ready(nn) ((nn)->sessionid_hashtbl)
- extern void nfsd_netns_free_versions(struct nfsd_net *nn);
- extern unsigned int nfsd_net_id;
- void nfsd_copy_write_verifier(__be32 verf[2], struct nfsd_net *nn);
- void nfsd_reset_write_verifier(struct nfsd_net *nn);
- #endif /* __NFSD_NETNS_H__ */
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