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![Dai Ngo](/assets/img/avatar_default.png)
Currently there is no limit on how many v4 clients are supported by the system. This can be a problem in systems with small memory configuration to function properly when a very large number of clients exist that creates memory shortage conditions. This patch enforces a limit of 1024 NFSv4 clients, including courtesy clients, per 1GB of system memory. When the number of the clients reaches the limit, requests that create new clients are returned with NFS4ERR_DELAY and the laundromat is kicked start to trim old clients. Due to the overhead of the upcall to remove the client record, the maximun number of clients the laundromat removes on each run is limited to 128. This is done to ensure the laundromat can still process the other tasks in a timely manner. Since there is now a limit of the number of clients, the 24-hr idle time limit of courtesy client is no longer needed and was removed. Signed-off-by: Dai Ngo <dai.ngo@oracle.com> Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
206 lines
5.5 KiB
C
206 lines
5.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* per net namespace data structures for nfsd
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*
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* Copyright (C) 2012, Jeff Layton <jlayton@redhat.com>
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*/
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#ifndef __NFSD_NETNS_H__
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#define __NFSD_NETNS_H__
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#include <net/net_namespace.h>
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#include <net/netns/generic.h>
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#include <linux/percpu_counter.h>
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#include <linux/siphash.h>
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/* Hash tables for nfs4_clientid state */
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#define CLIENT_HASH_BITS 4
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#define CLIENT_HASH_SIZE (1 << CLIENT_HASH_BITS)
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#define CLIENT_HASH_MASK (CLIENT_HASH_SIZE - 1)
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#define SESSION_HASH_SIZE 512
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struct cld_net;
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struct nfsd4_client_tracking_ops;
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enum {
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/* cache misses due only to checksum comparison failures */
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NFSD_NET_PAYLOAD_MISSES,
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/* amount of memory (in bytes) currently consumed by the DRC */
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NFSD_NET_DRC_MEM_USAGE,
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NFSD_NET_COUNTERS_NUM
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};
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/*
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* Represents a nfsd "container". With respect to nfsv4 state tracking, the
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* fields of interest are the *_id_hashtbls and the *_name_tree. These track
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* the nfs4_client objects by either short or long form clientid.
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*
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* Each nfsd_net runs a nfs4_laundromat workqueue job when necessary to clean
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* up expired clients and delegations within the container.
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*/
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struct nfsd_net {
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struct cld_net *cld_net;
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struct cache_detail *svc_expkey_cache;
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struct cache_detail *svc_export_cache;
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struct cache_detail *idtoname_cache;
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struct cache_detail *nametoid_cache;
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struct lock_manager nfsd4_manager;
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bool grace_ended;
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time64_t boot_time;
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struct dentry *nfsd_client_dir;
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/*
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* reclaim_str_hashtbl[] holds known client info from previous reset/reboot
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* used in reboot/reset lease grace period processing
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*
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* conf_id_hashtbl[], and conf_name_tree hold confirmed
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* setclientid_confirmed info.
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*
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* unconf_str_hastbl[] and unconf_name_tree hold unconfirmed
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* setclientid info.
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*/
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struct list_head *reclaim_str_hashtbl;
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int reclaim_str_hashtbl_size;
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struct list_head *conf_id_hashtbl;
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struct rb_root conf_name_tree;
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struct list_head *unconf_id_hashtbl;
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struct rb_root unconf_name_tree;
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struct list_head *sessionid_hashtbl;
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/*
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* client_lru holds client queue ordered by nfs4_client.cl_time
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* for lease renewal.
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*
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* close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
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* for last close replay.
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*
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* All of the above fields are protected by the client_mutex.
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*/
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struct list_head client_lru;
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struct list_head close_lru;
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struct list_head del_recall_lru;
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/* protected by blocked_locks_lock */
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struct list_head blocked_locks_lru;
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struct delayed_work laundromat_work;
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/* client_lock protects the client lru list and session hash table */
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spinlock_t client_lock;
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/* protects blocked_locks_lru */
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spinlock_t blocked_locks_lock;
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struct file *rec_file;
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bool in_grace;
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const struct nfsd4_client_tracking_ops *client_tracking_ops;
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time64_t nfsd4_lease;
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time64_t nfsd4_grace;
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bool somebody_reclaimed;
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bool track_reclaim_completes;
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atomic_t nr_reclaim_complete;
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bool nfsd_net_up;
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bool lockd_up;
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seqlock_t writeverf_lock;
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unsigned char writeverf[8];
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/*
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* Max number of connections this nfsd container will allow. Defaults
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* to '0' which is means that it bases this on the number of threads.
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*/
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unsigned int max_connections;
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u32 clientid_base;
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u32 clientid_counter;
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u32 clverifier_counter;
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struct svc_serv *nfsd_serv;
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/* When a listening socket is added to nfsd, keep_active is set
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* and this justifies a reference on nfsd_serv. This stops
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* nfsd_serv from being freed. When the number of threads is
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* set, keep_active is cleared and the reference is dropped. So
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* when the last thread exits, the service will be destroyed.
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*/
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int keep_active;
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/*
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* clientid and stateid data for construction of net unique COPY
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* stateids.
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*/
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u32 s2s_cp_cl_id;
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struct idr s2s_cp_stateids;
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spinlock_t s2s_cp_lock;
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/*
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* Version information
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*/
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bool *nfsd_versions;
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bool *nfsd4_minorversions;
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/*
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* Duplicate reply cache
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*/
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struct nfsd_drc_bucket *drc_hashtbl;
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/* max number of entries allowed in the cache */
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unsigned int max_drc_entries;
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/* number of significant bits in the hash value */
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unsigned int maskbits;
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unsigned int drc_hashsize;
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/*
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* Stats and other tracking of on the duplicate reply cache.
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* The longest_chain* fields are modified with only the per-bucket
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* cache lock, which isn't really safe and should be fixed if we want
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* these statistics to be completely accurate.
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*/
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/* total number of entries */
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atomic_t num_drc_entries;
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/* Per-netns stats counters */
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struct percpu_counter counter[NFSD_NET_COUNTERS_NUM];
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/* longest hash chain seen */
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unsigned int longest_chain;
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/* size of cache when we saw the longest hash chain */
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unsigned int longest_chain_cachesize;
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struct shrinker nfsd_reply_cache_shrinker;
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/* tracking server-to-server copy mounts */
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spinlock_t nfsd_ssc_lock;
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struct list_head nfsd_ssc_mount_list;
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wait_queue_head_t nfsd_ssc_waitq;
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/* utsname taken from the process that starts the server */
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char nfsd_name[UNX_MAXNODENAME+1];
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struct nfsd_fcache_disposal *fcache_disposal;
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siphash_key_t siphash_key;
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atomic_t nfs4_client_count;
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int nfs4_max_clients;
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};
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/* Simple check to find out if a given net was properly initialized */
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#define nfsd_netns_ready(nn) ((nn)->sessionid_hashtbl)
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extern void nfsd_netns_free_versions(struct nfsd_net *nn);
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extern unsigned int nfsd_net_id;
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void nfsd_copy_write_verifier(__be32 verf[2], struct nfsd_net *nn);
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void nfsd_reset_write_verifier(struct nfsd_net *nn);
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#endif /* __NFSD_NETNS_H__ */
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