linux-kernel - [PATCH] nfsd: fix a regression in threads procfile interface

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Message-Id: <20240625-nfsd-testing-v1-1-89c4782c5a2e@kernel.org>
Date: Tue, 25 Jun 2024 13:19:12 -0400
From: Jeff Layton <jlayton@...nel.org>
To: Chuck Lever <chuck.lever@...cle.com>, Neil Brown <neilb@...e.de>, 
 Olga Kornievskaia <kolga@...app.com>, Dai Ngo <Dai.Ngo@...cle.com>, 
 Tom Talpey <tom@...pey.com>
Cc: linux-nfs@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Jeff Layton <jlayton@...nel.org>
Subject: [PATCH] nfsd: fix a regression in threads procfile interface

The old threads interface passed in NULL for the pool here which tells
svc_set_num_threads to distribute the count over all the available
pools. Fix the logic to handle this case correctly.

Fixes: bbb07968d5e2 ("nfsd: make nfsd_svc take an array of thread counts")
Signed-off-by: Jeff Layton <jlayton@...nel.org>
---
It's probably best to squash this into bbb07968d5e2.
---
 fs/nfsd/nfssvc.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/fs/nfsd/nfssvc.c b/fs/nfsd/nfssvc.c
index 9edb4f7c4cc2..23e73190687f 100644
--- a/fs/nfsd/nfssvc.c
+++ b/fs/nfsd/nfssvc.c
@@ -735,6 +735,13 @@ int nfsd_set_nrthreads(int n, int *nthreads, struct net *net)
 	if (nn->nfsd_serv == NULL || n <= 0)
 		return 0;
 
+	/*
+	 * Special case: When n == 1, pass in NULL for the pool, so that the
+	 * change is distributed equally among them.
+	 */
+	if (n == 1)
+		return svc_set_num_threads(nn->nfsd_serv, NULL, nthreads[0]);
+
 	if (n > nn->nfsd_serv->sv_nrpools)
 		n = nn->nfsd_serv->sv_nrpools;
 

---
base-commit: 26086b8c567f3f758cdf3e1fc2ae205095751cb8
change-id: 20240625-nfsd-testing-84df99227eba

Best regards,
-- 
Jeff Layton <jlayton@...nel.org>