[v3,08/10] nfsd: make all of the nfsd stats per-network namespace

Message ID	5aa4d36f6993637bff99a0c487521a00a9048243.1706283433.git.josef@toxicpanda.com (mailing list archive)
State	New
Headers	show Received: from mail-yw1-f180.google.com (mail-yw1-f180.google.com [209.85.128.180]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C63D61CFB5 for <linux-nfs@vger.kernel.org>; Fri, 26 Jan 2024 15:40:52 +0000 (UTC) From: Josef Bacik <josef@toxicpanda.com> To: chuck.lever@oracle.com, jlayton@kernel.org, linux-nfs@vger.kernel.org Subject: [PATCH v3 08/10] nfsd: make all of the nfsd stats per-network namespace Date: Fri, 26 Jan 2024 10:39:47 -0500 Message-ID: <5aa4d36f6993637bff99a0c487521a00a9048243.1706283433.git.josef@toxicpanda.com> In-Reply-To: <cover.1706283433.git.josef@toxicpanda.com> References: <cover.1706283433.git.josef@toxicpanda.com> Precedence: bulk MIME-Version: 1.0 Content-Transfer-Encoding: 8bit
Series	Make nfsd stats visible in network ns \| expand [v3,00/10] Make nfsd stats visible in network ns [v3,01/10] sunrpc: don't change ->sv_stats if it doesn't exist [v3,02/10] nfs: stop setting ->pg_stats for unused stats [v3,03/10] sunrpc: pass in the sv_stats struct through svc_create_pooled [v3,04/10] sunrpc: remove ->pg_stats from svc_program [v3,05/10] sunrpc: use the struct net as the svc proc private [v3,06/10] nfsd: rename NFSD_NET_* to NFSD_STATS_* [v3,07/10] nfsd: expose /proc/net/sunrpc/nfsd in net namespaces [v3,08/10] nfsd: make all of the nfsd stats per-network namespace [v3,09/10] nfsd: remove nfsd_stats, make th_cnt a global counter [v3,10/10] nfsd: make svc_stat per-network namespace instead of global

diff --git a/fs/nfsd/cache.h b/fs/nfsd/cache.h index 4cbe0434cbb8..66a05fefae98 100644 --- a/fs/nfsd/cache.h +++ b/fs/nfsd/cache.h @@ -80,8 +80,6 @@ enum { int nfsd_drc_slab_create(void); void nfsd_drc_slab_free(void); -int nfsd_net_reply_cache_init(struct nfsd_net *nn); -void nfsd_net_reply_cache_destroy(struct nfsd_net *nn); int nfsd_reply_cache_init(struct nfsd_net *); void nfsd_reply_cache_shutdown(struct nfsd_net *); int nfsd_cache_lookup(struct svc_rqst *rqstp, unsigned int start, diff --git a/fs/nfsd/netns.h b/fs/nfsd/netns.h index e3605cb5f044..0cef4bb407a9 100644 --- a/fs/nfsd/netns.h +++ b/fs/nfsd/netns.h @@ -11,6 +11,7 @@ #include <net/net_namespace.h> #include <net/netns/generic.h> #include <linux/filelock.h> +#include <linux/nfs4.h> #include <linux/percpu_counter.h> #include <linux/siphash.h> @@ -29,7 +30,19 @@ enum { NFSD_STATS_PAYLOAD_MISSES, /* amount of memory (in bytes) currently consumed by the DRC */ NFSD_STATS_DRC_MEM_USAGE, - NFSD_NET_COUNTERS_NUM + NFSD_STATS_RC_HITS, /* repcache hits */ + NFSD_STATS_RC_MISSES, /* repcache misses */ + NFSD_STATS_RC_NOCACHE, /* uncached reqs */ + NFSD_STATS_FH_STALE, /* FH stale error */ + NFSD_STATS_IO_READ, /* bytes returned to read requests */ + NFSD_STATS_IO_WRITE, /* bytes passed in write requests */ +#ifdef CONFIG_NFSD_V4 + NFSD_STATS_FIRST_NFS4_OP, /* count of individual nfsv4 operations */ + NFSD_STATS_LAST_NFS4_OP = NFSD_STATS_FIRST_NFS4_OP + LAST_NFS4_OP, +#define NFSD_STATS_NFS4_OP(op) (NFSD_STATS_FIRST_NFS4_OP + (op)) + NFSD_STATS_WDELEG_GETATTR, /* count of getattr conflict with wdeleg */ +#endif + NFSD_STATS_COUNTERS_NUM }; /* @@ -164,7 +177,7 @@ struct nfsd_net { atomic_t num_drc_entries; /* Per-netns stats counters */ - struct percpu_counter counter[NFSD_NET_COUNTERS_NUM]; + struct percpu_counter counter[NFSD_STATS_COUNTERS_NUM]; /* longest hash chain seen */ unsigned int longest_chain; diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c index 14712fa08f76..648ff427005e 100644 --- a/fs/nfsd/nfs4proc.c +++ b/fs/nfsd/nfs4proc.c @@ -2490,10 +2490,10 @@ nfsd4_proc_null(struct svc_rqst *rqstp) return rpc_success; } -static inline void nfsd4_increment_op_stats(u32 opnum) +static inline void nfsd4_increment_op_stats(struct nfsd_net *nn, u32 opnum) { if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP) - percpu_counter_inc(&nfsdstats.counter[NFSD_STATS_NFS4_OP(opnum)]); + percpu_counter_inc(&nn->counter[NFSD_STATS_NFS4_OP(opnum)]); } static const struct nfsd4_operation nfsd4_ops[]; @@ -2768,7 +2768,7 @@ nfsd4_proc_compound(struct svc_rqst *rqstp) status, nfsd4_op_name(op->opnum)); nfsd4_cstate_clear_replay(cstate); - nfsd4_increment_op_stats(op->opnum); + nfsd4_increment_op_stats(nn, op->opnum); } fh_put(current_fh); diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c index fbf8b426950e..83c260ab485d 100644 --- a/fs/nfsd/nfs4state.c +++ b/fs/nfsd/nfs4state.c @@ -8457,6 +8457,7 @@ __be32 nfsd4_deleg_getattr_conflict(struct svc_rqst *rqstp, struct inode *inode) { __be32 status; + struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); struct file_lock_context *ctx; struct file_lock *fl; struct nfs4_delegation *dp; @@ -8486,7 +8487,7 @@ nfsd4_deleg_getattr_conflict(struct svc_rqst *rqstp, struct inode *inode) } break_lease: spin_unlock(&ctx->flc_lock); - nfsd_stats_wdeleg_getattr_inc(); + nfsd_stats_wdeleg_getattr_inc(nn); status = nfserrno(nfsd_open_break_lease(inode, NFSD_MAY_READ)); if (status != nfserr_jukebox || !nfsd_wait_for_delegreturn(rqstp, inode)) diff --git a/fs/nfsd/nfscache.c b/fs/nfsd/nfscache.c index 3d4a9d181c43..cfcc6ac8f255 100644 --- a/fs/nfsd/nfscache.c +++ b/fs/nfsd/nfscache.c @@ -176,27 +176,6 @@ void nfsd_drc_slab_free(void) kmem_cache_destroy(drc_slab); } -/** - * nfsd_net_reply_cache_init - per net namespace reply cache set-up - * @nn: nfsd_net being initialized - * - * Returns zero on succes; otherwise a negative errno is returned. - */ -int nfsd_net_reply_cache_init(struct nfsd_net *nn) -{ - return nfsd_percpu_counters_init(nn->counter, NFSD_NET_COUNTERS_NUM); -} - -/** - * nfsd_net_reply_cache_destroy - per net namespace reply cache tear-down - * @nn: nfsd_net being freed - * - */ -void nfsd_net_reply_cache_destroy(struct nfsd_net *nn) -{ - nfsd_percpu_counters_destroy(nn->counter, NFSD_NET_COUNTERS_NUM); -} - int nfsd_reply_cache_init(struct nfsd_net *nn) { unsigned int hashsize; @@ -501,7 +480,7 @@ nfsd_cache_insert(struct nfsd_drc_bucket *b, struct nfsd_cacherep *key, int nfsd_cache_lookup(struct svc_rqst *rqstp, unsigned int start, unsigned int len, struct nfsd_cacherep **cacherep) { - struct nfsd_net *nn; + struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); struct nfsd_cacherep *rp, *found; __wsum csum; struct nfsd_drc_bucket *b; @@ -510,7 +489,7 @@ int nfsd_cache_lookup(struct svc_rqst *rqstp, unsigned int start, int rtn = RC_DOIT; if (type == RC_NOCACHE) { - nfsd_stats_rc_nocache_inc(); + nfsd_stats_rc_nocache_inc(nn); goto out; } @@ -520,7 +499,6 @@ int nfsd_cache_lookup(struct svc_rqst *rqstp, unsigned int start, * Since the common case is a cache miss followed by an insert, * preallocate an entry. */ - nn = net_generic(SVC_NET(rqstp), nfsd_net_id); rp = nfsd_cacherep_alloc(rqstp, csum, nn); if (!rp) goto out; @@ -537,7 +515,7 @@ int nfsd_cache_lookup(struct svc_rqst *rqstp, unsigned int start, nfsd_cacherep_dispose(&dispose); - nfsd_stats_rc_misses_inc(); + nfsd_stats_rc_misses_inc(nn); atomic_inc(&nn->num_drc_entries); nfsd_stats_drc_mem_usage_add(nn, sizeof(*rp)); goto out; @@ -545,7 +523,7 @@ int nfsd_cache_lookup(struct svc_rqst *rqstp, unsigned int start, found_entry: /* We found a matching entry which is either in progress or done. */ nfsd_reply_cache_free_locked(NULL, rp, nn); - nfsd_stats_rc_hits_inc(); + nfsd_stats_rc_hits_inc(nn); rtn = RC_DROPIT; rp = found; @@ -689,11 +667,11 @@ int nfsd_reply_cache_stats_show(struct seq_file *m, void *v) seq_printf(m, "mem usage: %lld\n", percpu_counter_sum_positive(&nn->counter[NFSD_STATS_DRC_MEM_USAGE])); seq_printf(m, "cache hits: %lld\n", - percpu_counter_sum_positive(&nfsdstats.counter[NFSD_STATS_RC_HITS])); + percpu_counter_sum_positive(&nn->counter[NFSD_STATS_RC_HITS])); seq_printf(m, "cache misses: %lld\n", - percpu_counter_sum_positive(&nfsdstats.counter[NFSD_STATS_RC_MISSES])); + percpu_counter_sum_positive(&nn->counter[NFSD_STATS_RC_MISSES])); seq_printf(m, "not cached: %lld\n", - percpu_counter_sum_positive(&nfsdstats.counter[NFSD_STATS_RC_NOCACHE])); + percpu_counter_sum_positive(&nn->counter[NFSD_STATS_RC_NOCACHE])); seq_printf(m, "payload misses: %lld\n", percpu_counter_sum_positive(&nn->counter[NFSD_STATS_PAYLOAD_MISSES])); seq_printf(m, "longest chain len: %u\n", nn->longest_chain); diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c index b57480b50e35..ea3c8114245c 100644 --- a/fs/nfsd/nfsctl.c +++ b/fs/nfsd/nfsctl.c @@ -1671,7 +1671,7 @@ static __net_init int nfsd_net_init(struct net *net) retval = nfsd_idmap_init(net); if (retval) goto out_idmap_error; - retval = nfsd_net_reply_cache_init(nn); + retval = nfsd_stat_counters_init(nn); if (retval) goto out_repcache_error; nn->nfsd_versions = NULL; @@ -1701,7 +1701,7 @@ static __net_exit void nfsd_net_exit(struct net *net) struct nfsd_net *nn = net_generic(net, nfsd_net_id); nfsd_proc_stat_shutdown(net); - nfsd_net_reply_cache_destroy(nn); + nfsd_stat_counters_destroy(nn); nfsd_idmap_shutdown(net); nfsd_export_shutdown(net); nfsd_netns_free_versions(nn); @@ -1724,12 +1724,9 @@ static int __init init_nfsd(void) retval = nfsd4_init_pnfs(); if (retval) goto out_free_slabs; - retval = nfsd_stat_counters_init(); /* Statistics */ - if (retval) - goto out_free_pnfs; retval = nfsd_drc_slab_create(); if (retval) - goto out_free_stat; + goto out_free_pnfs; nfsd_lockd_init(); /* lockd->nfsd callbacks */ retval = create_proc_exports_entry(); if (retval) @@ -1763,8 +1760,6 @@ static int __init init_nfsd(void) out_free_lockd: nfsd_lockd_shutdown(); nfsd_drc_slab_free(); -out_free_stat: - nfsd_stat_counters_destroy(); out_free_pnfs: nfsd4_exit_pnfs(); out_free_slabs: @@ -1782,7 +1777,6 @@ static void __exit exit_nfsd(void) nfsd_drc_slab_free(); remove_proc_entry("fs/nfs/exports", NULL); remove_proc_entry("fs/nfs", NULL); - nfsd_stat_counters_destroy(); nfsd_lockd_shutdown(); nfsd4_free_slabs(); nfsd4_exit_pnfs(); diff --git a/fs/nfsd/nfsfh.c b/fs/nfsd/nfsfh.c index dbfa0ac13564..40fecf7b224f 100644 --- a/fs/nfsd/nfsfh.c +++ b/fs/nfsd/nfsfh.c @@ -327,6 +327,7 @@ static __be32 nfsd_set_fh_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp) __be32 fh_verify(struct svc_rqst *rqstp, struct svc_fh *fhp, umode_t type, int access) { + struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); struct svc_export *exp = NULL; struct dentry *dentry; __be32 error; @@ -395,7 +396,7 @@ fh_verify(struct svc_rqst *rqstp, struct svc_fh *fhp, umode_t type, int access) out: trace_nfsd_fh_verify_err(rqstp, fhp, type, access, error); if (error == nfserr_stale) - nfsd_stats_fh_stale_inc(exp); + nfsd_stats_fh_stale_inc(nn, exp); return error; } diff --git a/fs/nfsd/stats.c b/fs/nfsd/stats.c index 394a65a33942..44e275324b06 100644 --- a/fs/nfsd/stats.c +++ b/fs/nfsd/stats.c @@ -34,15 +34,17 @@ struct svc_stat nfsd_svcstats = { static int nfsd_show(struct seq_file *seq, void *v) { + struct net *net = pde_data(file_inode(seq->file)); + struct nfsd_net *nn = net_generic(net, nfsd_net_id); int i; seq_printf(seq, "rc %lld %lld %lld\nfh %lld 0 0 0 0\nio %lld %lld\n", - percpu_counter_sum_positive(&nfsdstats.counter[NFSD_STATS_RC_HITS]), - percpu_counter_sum_positive(&nfsdstats.counter[NFSD_STATS_RC_MISSES]), - percpu_counter_sum_positive(&nfsdstats.counter[NFSD_STATS_RC_NOCACHE]), - percpu_counter_sum_positive(&nfsdstats.counter[NFSD_STATS_FH_STALE]), - percpu_counter_sum_positive(&nfsdstats.counter[NFSD_STATS_IO_READ]), - percpu_counter_sum_positive(&nfsdstats.counter[NFSD_STATS_IO_WRITE])); + percpu_counter_sum_positive(&nn->counter[NFSD_STATS_RC_HITS]), + percpu_counter_sum_positive(&nn->counter[NFSD_STATS_RC_MISSES]), + percpu_counter_sum_positive(&nn->counter[NFSD_STATS_RC_NOCACHE]), + percpu_counter_sum_positive(&nn->counter[NFSD_STATS_FH_STALE]), + percpu_counter_sum_positive(&nn->counter[NFSD_STATS_IO_READ]), + percpu_counter_sum_positive(&nn->counter[NFSD_STATS_IO_WRITE])); /* thread usage: */ seq_printf(seq, "th %u 0", atomic_read(&nfsdstats.th_cnt)); @@ -63,10 +65,10 @@ static int nfsd_show(struct seq_file *seq, void *v) seq_printf(seq, "proc4ops %u", LAST_NFS4_OP + 1); for (i = 0; i <= LAST_NFS4_OP; i++) { seq_printf(seq, " %lld", - percpu_counter_sum_positive(&nfsdstats.counter[NFSD_STATS_NFS4_OP(i)])); + percpu_counter_sum_positive(&nn->counter[NFSD_STATS_NFS4_OP(i)])); } seq_printf(seq, "\nwdeleg_getattr %lld", - percpu_counter_sum_positive(&nfsdstats.counter[NFSD_STATS_WDELEG_GETATTR])); + percpu_counter_sum_positive(&nn->counter[NFSD_STATS_WDELEG_GETATTR])); seq_putc(seq, '\n'); #endif @@ -108,14 +110,14 @@ void nfsd_percpu_counters_destroy(struct percpu_counter counters[], int num) percpu_counter_destroy(&counters[i]); } -int nfsd_stat_counters_init(void) +int nfsd_stat_counters_init(struct nfsd_net *nn) { - return nfsd_percpu_counters_init(nfsdstats.counter, NFSD_STATS_COUNTERS_NUM); + return nfsd_percpu_counters_init(nn->counter, NFSD_STATS_COUNTERS_NUM); } -void nfsd_stat_counters_destroy(void) +void nfsd_stat_counters_destroy(struct nfsd_net *nn) { - nfsd_percpu_counters_destroy(nfsdstats.counter, NFSD_STATS_COUNTERS_NUM); + nfsd_percpu_counters_destroy(nn->counter, NFSD_STATS_COUNTERS_NUM); } void nfsd_proc_stat_init(struct net *net) diff --git a/fs/nfsd/stats.h b/fs/nfsd/stats.h index 38811aa7d13e..c24be4ddbe7d 100644 --- a/fs/nfsd/stats.h +++ b/fs/nfsd/stats.h @@ -10,26 +10,7 @@ #include <uapi/linux/nfsd/stats.h> #include <linux/percpu_counter.h> - -enum { - NFSD_STATS_RC_HITS, /* repcache hits */ - NFSD_STATS_RC_MISSES, /* repcache misses */ - NFSD_STATS_RC_NOCACHE, /* uncached reqs */ - NFSD_STATS_FH_STALE, /* FH stale error */ - NFSD_STATS_IO_READ, /* bytes returned to read requests */ - NFSD_STATS_IO_WRITE, /* bytes passed in write requests */ -#ifdef CONFIG_NFSD_V4 - NFSD_STATS_FIRST_NFS4_OP, /* count of individual nfsv4 operations */ - NFSD_STATS_LAST_NFS4_OP = NFSD_STATS_FIRST_NFS4_OP + LAST_NFS4_OP, -#define NFSD_STATS_NFS4_OP(op) (NFSD_STATS_FIRST_NFS4_OP + (op)) - NFSD_STATS_WDELEG_GETATTR, /* count of getattr conflict with wdeleg */ -#endif - NFSD_STATS_COUNTERS_NUM -}; - struct nfsd_stats { - struct percpu_counter counter[NFSD_STATS_COUNTERS_NUM]; - atomic_t th_cnt; /* number of available threads */ }; @@ -40,43 +21,46 @@ extern struct svc_stat nfsd_svcstats; int nfsd_percpu_counters_init(struct percpu_counter *counters, int num); void nfsd_percpu_counters_reset(struct percpu_counter *counters, int num); void nfsd_percpu_counters_destroy(struct percpu_counter *counters, int num); -int nfsd_stat_counters_init(void); -void nfsd_stat_counters_destroy(void); +int nfsd_stat_counters_init(struct nfsd_net *nn); +void nfsd_stat_counters_destroy(struct nfsd_net *nn); void nfsd_proc_stat_init(struct net *net); void nfsd_proc_stat_shutdown(struct net *net); -static inline void nfsd_stats_rc_hits_inc(void) +static inline void nfsd_stats_rc_hits_inc(struct nfsd_net *nn) { - percpu_counter_inc(&nfsdstats.counter[NFSD_STATS_RC_HITS]); + percpu_counter_inc(&nn->counter[NFSD_STATS_RC_HITS]); } -static inline void nfsd_stats_rc_misses_inc(void) +static inline void nfsd_stats_rc_misses_inc(struct nfsd_net *nn) { - percpu_counter_inc(&nfsdstats.counter[NFSD_STATS_RC_MISSES]); + percpu_counter_inc(&nn->counter[NFSD_STATS_RC_MISSES]); } -static inline void nfsd_stats_rc_nocache_inc(void) +static inline void nfsd_stats_rc_nocache_inc(struct nfsd_net *nn) { - percpu_counter_inc(&nfsdstats.counter[NFSD_STATS_RC_NOCACHE]); + percpu_counter_inc(&nn->counter[NFSD_STATS_RC_NOCACHE]); } -static inline void nfsd_stats_fh_stale_inc(struct svc_export *exp) +static inline void nfsd_stats_fh_stale_inc(struct nfsd_net *nn, + struct svc_export *exp) { - percpu_counter_inc(&nfsdstats.counter[NFSD_STATS_FH_STALE]); + percpu_counter_inc(&nn->counter[NFSD_STATS_FH_STALE]); if (exp && exp->ex_stats) percpu_counter_inc(&exp->ex_stats->counter[EXP_STATS_FH_STALE]); } -static inline void nfsd_stats_io_read_add(struct svc_export *exp, s64 amount) +static inline void nfsd_stats_io_read_add(struct nfsd_net *nn, + struct svc_export *exp, s64 amount) { - percpu_counter_add(&nfsdstats.counter[NFSD_STATS_IO_READ], amount); + percpu_counter_add(&nn->counter[NFSD_STATS_IO_READ], amount); if (exp && exp->ex_stats) percpu_counter_add(&exp->ex_stats->counter[EXP_STATS_IO_READ], amount); } -static inline void nfsd_stats_io_write_add(struct svc_export *exp, s64 amount) +static inline void nfsd_stats_io_write_add(struct nfsd_net *nn, + struct svc_export *exp, s64 amount) { - percpu_counter_add(&nfsdstats.counter[NFSD_STATS_IO_WRITE], amount); + percpu_counter_add(&nn->counter[NFSD_STATS_IO_WRITE], amount); if (exp && exp->ex_stats) percpu_counter_add(&exp->ex_stats->counter[EXP_STATS_IO_WRITE], amount); } @@ -97,9 +81,9 @@ static inline void nfsd_stats_drc_mem_usage_sub(struct nfsd_net *nn, s64 amount) } #ifdef CONFIG_NFSD_V4 -static inline void nfsd_stats_wdeleg_getattr_inc(void) +static inline void nfsd_stats_wdeleg_getattr_inc(struct nfsd_net *nn) { - percpu_counter_inc(&nfsdstats.counter[NFSD_STATS_WDELEG_GETATTR]); + percpu_counter_inc(&nn->counter[NFSD_STATS_WDELEG_GETATTR]); } #endif #endif /* _NFSD_STATS_H */ diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c index f57749cd6f0b..33af4bc7f423 100644 --- a/fs/nfsd/vfs.c +++ b/fs/nfsd/vfs.c @@ -1002,7 +1002,8 @@ static __be32 nfsd_finish_read(struct svc_rqst *rqstp, struct svc_fh *fhp, unsigned long *count, u32 *eof, ssize_t host_err) { if (host_err >= 0) { - nfsd_stats_io_read_add(fhp->fh_export, host_err); + struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); + nfsd_stats_io_read_add(nn, fhp->fh_export, host_err); *eof = nfsd_eof_on_read(file, offset, host_err, *count); *count = host_err; fsnotify_access(file); @@ -1185,7 +1186,7 @@ nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct nfsd_file *nf, goto out_nfserr; } *cnt = host_err; - nfsd_stats_io_write_add(exp, *cnt); + nfsd_stats_io_write_add(nn, exp, *cnt); fsnotify_modify(file); host_err = filemap_check_wb_err(file->f_mapping, since); if (host_err < 0)

[v3,08/10] nfsd: make all of the nfsd stats per-network namespace

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