From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C7E195540AA for ; Tue, 8 Sep 2026 22:37:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788907039; cv=none; b=a6ESbfrhf/E9v/71VG3OApYvJxQb2TcUiYZSiZ5DPnlmlB0y8tODgJGK+QLUwF84/KxSNFQtm8tlrVf0zd7/mTms3EayxBjHJHcdvxd649ak299Q3x0DdUEQXPiGEZ7r1dn9LFuXQ5GeVvWzg6z1QTWNrejzMqqgVKby1oBz5JI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788907039; c=relaxed/simple; bh=X0Kbsx5lC0QnyfJgy8S9qiAaVBaA25rx7KdR9OQuL+w=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=qS3eowwLYaFv2f7qsKFi7HlzwCX0qjvZY1USzJV+K0nmCv0H6CVHzMBxiZg9aIh79sopFn7a6fiKiTj1PYSYvg+WGwDDOwnnHsBth502tQ5DHuF/ZanoNo4CUBbVM9YNzwE0+lNyDFhL5K38ZXetfOsIKCW06Zy1mthgBSzqF3s= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=TZH5EOQs; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="TZH5EOQs" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B5F0C1F00A3F; Tue, 8 Sep 2026 22:37:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1788907034; bh=mo7qQEQSaq0y8mLdW9CpJeD2U0NR1JcQJX5kstZCtrQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=TZH5EOQs2PNed99lPfm7Aidd7ldg7t1l83Cip3fD3Q2mnQ6brUoA5Df10Kn/8BOGu u57yong1Ey6BsGWcTsP95u/L3Qgc7OnXr8VUP5UuJaKj67MzrR5bepAVai2dJV8bRa 00DPUUhoM0BJ820LllERVKBbnVk+C/ExfhGYrrX3QD9GYFAHxtzqcmnnmCNDmeSjWJ cQSX+f39US/zknMaBYNgx5/YXX+ZgDc4TAfDmy17dFG7ZO0awWWKxsZpYFPWPimCD+ 9kiqxQ3+TnEGmBPj31HWGoRbvVYXGszadIvMs69VoNdZIgut74cbSJUMmk88XtFaa8 wuxPMnPS+d5xw== From: Sasha Levin To: stable@vger.kernel.org Cc: Jeff Layton , Chuck Lever , Sasha Levin Subject: [PATCH 6.6.y 3/4] sunrpc: refactor pool_mode setting code Date: Tue, 8 Sep 2026 18:37:09 -0400 Message-ID: <20260908223710.506600-3-sashal@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260908223710.506600-1-sashal@kernel.org> References: <2026090350-breeze-repugnant-70de@gregkh> <20260908223710.506600-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Jeff Layton [ Upstream commit 5f71f3c325534da55dfda487a67208e2e0f0cd1b ] Allow the pool_mode setting code to be called from internal callers so we can call it from a new netlink op. Add a new svc_pool_map_get function to return the current setting. Change the existing module parameter handling to use the new interfaces under the hood. Signed-off-by: Jeff Layton Signed-off-by: Chuck Lever Stable-dep-of: c479bde671cb ("sunrpc: defer rq_argp and rq_resp free until after RCU grace period") Signed-off-by: Sasha Levin --- include/linux/sunrpc/svc.h | 2 + net/sunrpc/svc.c | 85 ++++++++++++++++++++++++++++---------- 2 files changed, 66 insertions(+), 21 deletions(-) diff --git a/include/linux/sunrpc/svc.h b/include/linux/sunrpc/svc.h index 3d8b215f32d5b..d4558fefd9b4e 100644 --- a/include/linux/sunrpc/svc.h +++ b/include/linux/sunrpc/svc.h @@ -395,6 +395,8 @@ struct svc_procedure { /* * Function prototypes. */ +int sunrpc_set_pool_mode(const char *val); +int sunrpc_get_pool_mode(char *val, size_t size); int svc_rpcb_setup(struct svc_serv *serv, struct net *net); void svc_rpcb_cleanup(struct svc_serv *serv, struct net *net); int svc_bind(struct svc_serv *serv, struct net *net); diff --git a/net/sunrpc/svc.c b/net/sunrpc/svc.c index 4d8d460747164..bf88a955920f2 100644 --- a/net/sunrpc/svc.c +++ b/net/sunrpc/svc.c @@ -72,57 +72,100 @@ static struct svc_pool_map svc_pool_map = { static DEFINE_MUTEX(svc_pool_map_mutex);/* protects svc_pool_map.count only */ static int -param_set_pool_mode(const char *val, const struct kernel_param *kp) +__param_set_pool_mode(const char *val, struct svc_pool_map *m) { - int *ip = (int *)kp->arg; - struct svc_pool_map *m = &svc_pool_map; - int err; + int err, mode; mutex_lock(&svc_pool_map_mutex); - err = -EBUSY; - if (m->count) - goto out; - err = 0; if (!strncmp(val, "auto", 4)) - *ip = SVC_POOL_AUTO; + mode = SVC_POOL_AUTO; else if (!strncmp(val, "global", 6)) - *ip = SVC_POOL_GLOBAL; + mode = SVC_POOL_GLOBAL; else if (!strncmp(val, "percpu", 6)) - *ip = SVC_POOL_PERCPU; + mode = SVC_POOL_PERCPU; else if (!strncmp(val, "pernode", 7)) - *ip = SVC_POOL_PERNODE; + mode = SVC_POOL_PERNODE; else err = -EINVAL; + if (err) + goto out; + + if (m->count == 0) + m->mode = mode; + else if (mode != m->mode) + err = -EBUSY; out: mutex_unlock(&svc_pool_map_mutex); return err; } static int -param_get_pool_mode(char *buf, const struct kernel_param *kp) +param_set_pool_mode(const char *val, const struct kernel_param *kp) +{ + struct svc_pool_map *m = kp->arg; + + return __param_set_pool_mode(val, m); +} + +int sunrpc_set_pool_mode(const char *val) +{ + return __param_set_pool_mode(val, &svc_pool_map); +} +EXPORT_SYMBOL(sunrpc_set_pool_mode); + +/** + * sunrpc_get_pool_mode - get the current pool_mode for the host + * @buf: where to write the current pool_mode + * @size: size of @buf + * + * Grab the current pool_mode from the svc_pool_map and write + * the resulting string to @buf. Returns the number of characters + * written to @buf (a'la snprintf()). + */ +int +sunrpc_get_pool_mode(char *buf, size_t size) { - int *ip = (int *)kp->arg; + struct svc_pool_map *m = &svc_pool_map; - switch (*ip) + switch (m->mode) { case SVC_POOL_AUTO: - return sysfs_emit(buf, "auto\n"); + return snprintf(buf, size, "auto"); case SVC_POOL_GLOBAL: - return sysfs_emit(buf, "global\n"); + return snprintf(buf, size, "global"); case SVC_POOL_PERCPU: - return sysfs_emit(buf, "percpu\n"); + return snprintf(buf, size, "percpu"); case SVC_POOL_PERNODE: - return sysfs_emit(buf, "pernode\n"); + return snprintf(buf, size, "pernode"); default: - return sysfs_emit(buf, "%d\n", *ip); + return snprintf(buf, size, "%d", m->mode); } } +EXPORT_SYMBOL(sunrpc_get_pool_mode); + +static int +param_get_pool_mode(char *buf, const struct kernel_param *kp) +{ + char str[16]; + int len; + + len = sunrpc_get_pool_mode(str, ARRAY_SIZE(str)); + + /* Ensure we have room for newline and NUL */ + len = min_t(int, len, ARRAY_SIZE(str) - 2); + + /* tack on the newline */ + str[len] = '\n'; + str[len + 1] = '\0'; + + return sysfs_emit(buf, str); +} module_param_call(pool_mode, param_set_pool_mode, param_get_pool_mode, - &svc_pool_map.mode, 0644); + &svc_pool_map, 0644); /* * Detect best pool mapping mode heuristically, -- 2.53.0