From 8daae4dc0d09d44d38194f72bc91740b46a6ce53 Mon Sep 17 00:00:00 2001 From: Stanislav Kinsbursky Date: Wed, 14 Nov 2012 18:21:21 +0300 Subject: [PATCH] nfsd: make conf_id_hashtbl allocated per net This hash holds nfs4_clients info, which are network namespace aware. So let's make it allocated per network namespace. Note: this hash can be allocated in per-net operations. But it looks better to allocate it on nfsd state start and thus don't waste resources if server is not running. Signed-off-by: Stanislav Kinsbursky Signed-off-by: J. Bruce Fields --- fs/nfsd/netns.h | 1 + fs/nfsd/nfs4state.c | 75 ++++++++++++++++++++++++++++++++------------- 2 files changed, 55 insertions(+), 21 deletions(-) diff --git a/fs/nfsd/netns.h b/fs/nfsd/netns.h index 49e54790d862..0cc85e95e8a4 100644 --- a/fs/nfsd/netns.h +++ b/fs/nfsd/netns.h @@ -50,6 +50,7 @@ struct nfsd_net { */ struct list_head *reclaim_str_hashtbl; int reclaim_str_hashtbl_size; + struct list_head *conf_id_hashtbl; }; extern int nfsd_net_id; diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c index ba4785559509..6df427773d01 100644 --- a/fs/nfsd/nfs4state.c +++ b/fs/nfsd/nfs4state.c @@ -418,7 +418,6 @@ static unsigned int clientstr_hashval(const char *name) * * All of the above fields are protected by the client_mutex. */ -static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE]; static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE]; static struct rb_root conf_name_tree; static struct rb_root unconf_name_tree; @@ -1385,9 +1384,10 @@ static void move_to_confirmed(struct nfs4_client *clp) { unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id); + struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp); - list_move(&clp->cl_idhash, &conf_id_hashtbl[idhashval]); + list_move(&clp->cl_idhash, &nn->conf_id_hashtbl[idhashval]); rb_erase(&clp->cl_namenode, &unconf_name_tree); add_clp_to_name_tree(clp, &conf_name_tree); set_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags); @@ -1395,12 +1395,12 @@ move_to_confirmed(struct nfs4_client *clp) } static struct nfs4_client * -find_confirmed_client(clientid_t *clid, bool sessions) +find_confirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn) { struct nfs4_client *clp; unsigned int idhashval = clientid_hashval(clid->cl_id); - list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) { + list_for_each_entry(clp, &nn->conf_id_hashtbl[idhashval], cl_idhash) { if (same_clid(&clp->cl_clientid, clid)) { if ((bool)clp->cl_minorversion != sessions) return NULL; @@ -1787,6 +1787,7 @@ nfsd4_create_session(struct svc_rqst *rqstp, struct nfsd4_conn *conn; struct nfsd4_clid_slot *cs_slot = NULL; __be32 status = 0; + struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); if (cr_ses->flags & ~SESSION4_FLAG_MASK_A) return nfserr_inval; @@ -1802,7 +1803,7 @@ nfsd4_create_session(struct svc_rqst *rqstp, nfs4_lock_state(); unconf = find_unconfirmed_client(&cr_ses->clientid, true); - conf = find_confirmed_client(&cr_ses->clientid, true); + conf = find_confirmed_client(&cr_ses->clientid, true, nn); if (conf) { cs_slot = &conf->cl_cs_slot; @@ -2142,10 +2143,11 @@ nfsd4_destroy_clientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *csta { struct nfs4_client *conf, *unconf, *clp; __be32 status = 0; + struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); nfs4_lock_state(); unconf = find_unconfirmed_client(&dc->clientid, true); - conf = find_confirmed_client(&dc->clientid, true); + conf = find_confirmed_client(&dc->clientid, true, nn); if (conf) { clp = conf; @@ -2280,7 +2282,7 @@ nfsd4_setclientid_confirm(struct svc_rqst *rqstp, return nfserr_stale_clientid; nfs4_lock_state(); - conf = find_confirmed_client(clid, false); + conf = find_confirmed_client(clid, false, nn); unconf = find_unconfirmed_client(clid, false); /* * We try hard to give out unique clientid's, so if we get an @@ -2656,7 +2658,8 @@ nfsd4_process_open1(struct nfsd4_compound_state *cstate, oo = find_openstateowner_str(strhashval, open, cstate->minorversion); open->op_openowner = oo; if (!oo) { - clp = find_confirmed_client(clientid, cstate->minorversion); + clp = find_confirmed_client(clientid, cstate->minorversion, + nn); if (clp == NULL) return nfserr_expired; goto new_owner; @@ -3152,7 +3155,7 @@ nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, status = nfserr_stale_clientid; if (STALE_CLIENTID(clid, nn)) goto out; - clp = find_confirmed_client(clid, cstate->minorversion); + clp = find_confirmed_client(clid, cstate->minorversion, nn); status = nfserr_expired; if (clp == NULL) { /* We assume the client took too long to RENEW. */ @@ -3428,7 +3431,7 @@ static __be32 nfsd4_lookup_stateid(stateid_t *stateid, unsigned char typemask, s return nfserr_bad_stateid; if (STALE_STATEID(stateid, nn)) return nfserr_stale_stateid; - cl = find_confirmed_client(&stateid->si_opaque.so_clid, sessions); + cl = find_confirmed_client(&stateid->si_opaque.so_clid, sessions, nn); if (!cl) return nfserr_expired; *s = find_stateid_by_type(cl, stateid, typemask); @@ -4579,9 +4582,10 @@ __be32 nfs4_check_open_reclaim(clientid_t *clid, bool sessions) { struct nfs4_client *clp; + struct nfsd_net *nn = net_generic(&init_net, nfsd_net_id); /* find clientid in conf_id_hashtbl */ - clp = find_confirmed_client(clid, sessions); + clp = find_confirmed_client(clid, sessions, nn); if (clp == NULL) return nfserr_reclaim_bad; @@ -4720,7 +4724,6 @@ nfs4_state_init(void) int i; for (i = 0; i < CLIENT_HASH_SIZE; i++) { - INIT_LIST_HEAD(&conf_id_hashtbl[i]); INIT_LIST_HEAD(&unconf_id_hashtbl[i]); } conf_name_tree = RB_ROOT; @@ -4761,6 +4764,38 @@ set_max_delegations(void) max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT); } +static int nfs4_state_start_net(struct net *net) +{ + struct nfsd_net *nn = net_generic(net, nfsd_net_id); + int i; + + nn->conf_id_hashtbl = kmalloc(sizeof(struct list_head) * + CLIENT_HASH_SIZE, GFP_KERNEL); + if (!nn->conf_id_hashtbl) + return -ENOMEM; + + for (i = 0; i < CLIENT_HASH_SIZE; i++) + INIT_LIST_HEAD(&nn->conf_id_hashtbl[i]); + + return 0; +} + +static void +__nfs4_state_shutdown_net(struct net *net) +{ + int i; + struct nfs4_client *clp = NULL; + struct nfsd_net *nn = net_generic(net, nfsd_net_id); + + for (i = 0; i < CLIENT_HASH_SIZE; i++) { + while (!list_empty(&nn->conf_id_hashtbl[i])) { + clp = list_entry(nn->conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash); + destroy_client(clp); + } + } + kfree(nn->conf_id_hashtbl); +} + /* initialization to perform when the nfsd service is started: */ int @@ -4778,6 +4813,9 @@ nfs4_state_start(void) * basis. */ get_net(net); + ret = nfs4_state_start_net(net); + if (ret) + return ret; nfsd4_client_tracking_init(net); nn->boot_time = get_seconds(); locks_start_grace(net, &nn->nfsd4_manager); @@ -4804,26 +4842,21 @@ out_free_laundry: destroy_workqueue(laundry_wq); out_recovery: nfsd4_client_tracking_exit(net); + __nfs4_state_shutdown_net(net); put_net(net); return ret; } /* should be called with the state lock held */ static void -__nfs4_state_shutdown(void) +__nfs4_state_shutdown(struct net *net) { - int i; struct nfs4_client *clp = NULL; struct nfs4_delegation *dp = NULL; struct list_head *pos, *next, reaplist; struct rb_node *node, *tmp; - for (i = 0; i < CLIENT_HASH_SIZE; i++) { - while (!list_empty(&conf_id_hashtbl[i])) { - clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash); - destroy_client(clp); - } - } + __nfs4_state_shutdown_net(net); node = rb_first(&unconf_name_tree); while (node != NULL) { @@ -4860,7 +4893,7 @@ nfs4_state_shutdown(void) destroy_workqueue(laundry_wq); locks_end_grace(&nn->nfsd4_manager); nfs4_lock_state(); - __nfs4_state_shutdown(); + __nfs4_state_shutdown(net); nfs4_unlock_state(); nfsd4_destroy_callback_queue(); }