From patchwork Thu Mar 31 16:01:59 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dai Ngo X-Patchwork-Id: 12797426 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 71D5EC433EF for ; Thu, 31 Mar 2022 16:02:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239552AbiCaQEX (ORCPT ); Thu, 31 Mar 2022 12:04:23 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35370 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239471AbiCaQEI (ORCPT ); Thu, 31 Mar 2022 12:04:08 -0400 Received: from mx0a-00069f02.pphosted.com (mx0a-00069f02.pphosted.com [205.220.165.32]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5B2F26A050; Thu, 31 Mar 2022 09:02:21 -0700 (PDT) Received: from pps.filterd (m0246627.ppops.net [127.0.0.1]) by mx0b-00069f02.pphosted.com (8.16.1.2/8.16.1.2) with SMTP id 22VExwEE030419; Thu, 31 Mar 2022 16:02:18 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=from : to : cc : subject : date : message-id : in-reply-to : references; s=corp-2021-07-09; bh=xTY1D5IP/+x3DLOrYIDdP7OqXLFh1tM6rTp3CdlOMGs=; b=1Bf8DKwQ3XAYzyCXsqFn/S0Glhoi+/Y0xbMCqDgusOp6zwcFtBr1383waMZpJsSVd+2e eEGfFKVyO//u7Qo3BydIlUWEZPTLTMryIm5ohofo23TVaFk1QaCYxN0LKOw8cbuZEcpo xrsv7pc72B/VKbJi2q5OdhtuQIQpZqmnsDScpkB52+mmiRQz4db+6IiQNzdzVh7KP3fv xZi23yWtYBH+2H0C/UGwllFaaqpBsNeImyH266I14JmWVLDXbmr7sr6mHNTs20lueU77 xKe3JvnpxdAHZt/cjL7K1Xhkkl+VKi7XjgH/IyHo/uvxjDK4U90kzQaaUqaymtdAS/GZ Ig== Received: from phxpaimrmta02.imrmtpd1.prodappphxaev1.oraclevcn.com (phxpaimrmta02.appoci.oracle.com [147.154.114.232]) by mx0b-00069f02.pphosted.com with ESMTP id 3f1se0mtm5-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 31 Mar 2022 16:02:17 +0000 Received: from pps.filterd (phxpaimrmta02.imrmtpd1.prodappphxaev1.oraclevcn.com [127.0.0.1]) by phxpaimrmta02.imrmtpd1.prodappphxaev1.oraclevcn.com (8.16.1.2/8.16.1.2) with SMTP id 22VFvMT3029483; Thu, 31 Mar 2022 16:02:14 GMT Received: from pps.reinject (localhost [127.0.0.1]) by phxpaimrmta02.imrmtpd1.prodappphxaev1.oraclevcn.com with ESMTP id 3f1s95hxfy-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 31 Mar 2022 16:02:14 +0000 Received: from phxpaimrmta02.imrmtpd1.prodappphxaev1.oraclevcn.com (phxpaimrmta02.imrmtpd1.prodappphxaev1.oraclevcn.com [127.0.0.1]) by pps.reinject (8.16.0.36/8.16.0.36) with SMTP id 22VG10Jv003132; Thu, 31 Mar 2022 16:02:13 GMT Received: from ca-common-hq.us.oracle.com (ca-common-hq.us.oracle.com [10.211.9.209]) by phxpaimrmta02.imrmtpd1.prodappphxaev1.oraclevcn.com with ESMTP id 3f1s95hxf8-2; Thu, 31 Mar 2022 16:02:13 +0000 From: Dai Ngo To: chuck.lever@oracle.com, bfields@fieldses.org Cc: jlayton@redhat.com, viro@zeniv.linux.org.uk, linux-nfs@vger.kernel.org, linux-fsdevel@vger.kernel.org Subject: [PATCH RFC v19 01/11] fs/lock: add helper locks_owner_has_blockers to check for blockers Date: Thu, 31 Mar 2022 09:01:59 -0700 Message-Id: <1648742529-28551-2-git-send-email-dai.ngo@oracle.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1648742529-28551-1-git-send-email-dai.ngo@oracle.com> References: <1648742529-28551-1-git-send-email-dai.ngo@oracle.com> X-Proofpoint-ORIG-GUID: Cte19BpQeAKFT1u61j0fmRz6vsMMYyDE X-Proofpoint-GUID: Cte19BpQeAKFT1u61j0fmRz6vsMMYyDE Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Add helper locks_owner_has_blockers to check if there is any blockers for a given lockowner. Signed-off-by: Dai Ngo --- fs/locks.c | 28 ++++++++++++++++++++++++++++ include/linux/fs.h | 7 +++++++ 2 files changed, 35 insertions(+) diff --git a/fs/locks.c b/fs/locks.c index 050acf8b5110..53864eb99dc5 100644 --- a/fs/locks.c +++ b/fs/locks.c @@ -300,6 +300,34 @@ void locks_release_private(struct file_lock *fl) } EXPORT_SYMBOL_GPL(locks_release_private); +/** + * locks_owner_has_blockers - Check for blocking lock requests + * @flctx: file lock context + * @owner: lock owner + * + * Return values: + * %true: @owner has at least one blocker + * %false: @owner has no blockers + */ +bool locks_owner_has_blockers(struct file_lock_context *flctx, + fl_owner_t owner) +{ + struct file_lock *fl; + + spin_lock(&flctx->flc_lock); + list_for_each_entry(fl, &flctx->flc_posix, fl_list) { + if (fl->fl_owner != owner) + continue; + if (!list_empty(&fl->fl_blocked_requests)) { + spin_unlock(&flctx->flc_lock); + return true; + } + } + spin_unlock(&flctx->flc_lock); + return false; +} +EXPORT_SYMBOL_GPL(locks_owner_has_blockers); + /* Free a lock which is not in use. */ void locks_free_lock(struct file_lock *fl) { diff --git a/include/linux/fs.h b/include/linux/fs.h index 831b20430d6e..2057a9df790f 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -1200,6 +1200,8 @@ extern void lease_unregister_notifier(struct notifier_block *); struct files_struct; extern void show_fd_locks(struct seq_file *f, struct file *filp, struct files_struct *files); +extern bool locks_owner_has_blockers(struct file_lock_context *flctx, + fl_owner_t owner); #else /* !CONFIG_FILE_LOCKING */ static inline int fcntl_getlk(struct file *file, unsigned int cmd, struct flock __user *user) @@ -1335,6 +1337,11 @@ static inline int lease_modify(struct file_lock *fl, int arg, struct files_struct; static inline void show_fd_locks(struct seq_file *f, struct file *filp, struct files_struct *files) {} +static inline bool locks_owner_has_blockers(struct file_lock_context *flctx, + fl_owner_t owner) +{ + return false; +} #endif /* !CONFIG_FILE_LOCKING */ static inline struct inode *file_inode(const struct file *f)