[PATCH 5.10 423/770] nfsd: make nfsd_stats.th_cnt atomic_t

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5.10-stable review patch.  If anyone has any objections, please let me know.

------------------

From: NeilBrown <neilb@xxxxxxx>

[ Upstream commit 9b6c8c9bebccd5fb785c306b948c08874a88874d ]

This allows us to move the updates for th_cnt out of the mutex.
This is a step towards reducing mutex coverage in nfsd().

Signed-off-by: NeilBrown <neilb@xxxxxxx>
Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 fs/nfsd/nfssvc.c | 6 +++---
 fs/nfsd/stats.c  | 2 +-
 fs/nfsd/stats.h  | 4 +---
 3 files changed, 5 insertions(+), 7 deletions(-)

diff --git a/fs/nfsd/nfssvc.c b/fs/nfsd/nfssvc.c
index 141d884fee4f4..32f2c46a38323 100644
--- a/fs/nfsd/nfssvc.c
+++ b/fs/nfsd/nfssvc.c
@@ -57,7 +57,7 @@ static __be32			nfsd_init_request(struct svc_rqst *,
 /*
  * nfsd_mutex protects nn->nfsd_serv -- both the pointer itself and the members
  * of the svc_serv struct. In particular, ->sv_nrthreads but also to some
- * extent ->sv_temp_socks and ->sv_permsocks. It also protects nfsdstats.th_cnt
+ * extent ->sv_temp_socks and ->sv_permsocks.
  *
  * If (out side the lock) nn->nfsd_serv is non-NULL, then it must point to a
  * properly initialised 'struct svc_serv' with ->sv_nrthreads > 0 (unless
@@ -955,8 +955,8 @@ nfsd(void *vrqstp)
 	allow_signal(SIGINT);
 	allow_signal(SIGQUIT);
 
-	nfsdstats.th_cnt++;
 	mutex_unlock(&nfsd_mutex);
+	atomic_inc(&nfsdstats.th_cnt);
 
 	set_freezable();
 
@@ -983,8 +983,8 @@ nfsd(void *vrqstp)
 	/* Clear signals before calling svc_exit_thread() */
 	flush_signals(current);
 
+	atomic_dec(&nfsdstats.th_cnt);
 	mutex_lock(&nfsd_mutex);
-	nfsdstats.th_cnt --;
 
 out:
 	/* Take an extra ref so that the svc_put in svc_exit_thread()
diff --git a/fs/nfsd/stats.c b/fs/nfsd/stats.c
index 1d3b881e73821..a8c5a02a84f04 100644
--- a/fs/nfsd/stats.c
+++ b/fs/nfsd/stats.c
@@ -45,7 +45,7 @@ static int nfsd_proc_show(struct seq_file *seq, void *v)
 		   percpu_counter_sum_positive(&nfsdstats.counter[NFSD_STATS_IO_WRITE]));
 
 	/* thread usage: */
-	seq_printf(seq, "th %u 0", nfsdstats.th_cnt);
+	seq_printf(seq, "th %u 0", atomic_read(&nfsdstats.th_cnt));
 
 	/* deprecated thread usage histogram stats */
 	for (i = 0; i < 10; i++)
diff --git a/fs/nfsd/stats.h b/fs/nfsd/stats.h
index 51ecda852e23b..9b43dc3d99913 100644
--- a/fs/nfsd/stats.h
+++ b/fs/nfsd/stats.h
@@ -29,11 +29,9 @@ enum {
 struct nfsd_stats {
 	struct percpu_counter	counter[NFSD_STATS_COUNTERS_NUM];
 
-	/* Protected by nfsd_mutex */
-	unsigned int	th_cnt;		/* number of available threads */
+	atomic_t	th_cnt;		/* number of available threads */
 };
 
-
 extern struct nfsd_stats	nfsdstats;
 
 extern struct svc_stat		nfsd_svcstats;
-- 
2.43.0







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