From patchwork Tue Mar 29 06:55:59 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Naohiro Aota X-Patchwork-Id: 12794490 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 87F2CC433F5 for ; Tue, 29 Mar 2022 06:56:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233202AbiC2G5z (ORCPT ); Tue, 29 Mar 2022 02:57:55 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58236 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232317AbiC2G5w (ORCPT ); Tue, 29 Mar 2022 02:57:52 -0400 Received: from esa6.hgst.iphmx.com (esa6.hgst.iphmx.com [216.71.154.45]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CDF422E093; Mon, 28 Mar 2022 23:56:08 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=wdc.com; i=@wdc.com; q=dns/txt; s=dkim.wdc.com; t=1648536969; x=1680072969; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=6zGt4/7Bi6rVIM3CDrEKyuP24GWSiTE6w3IEXHN5j18=; b=Ho8efVm7o2X7ReeaeoBhBd6scPwTOkR95QgVGJPv3JHI7ez+FS86ej6p Sp64FGap9C/n8+lUJn4bNu//ZPf9NeXV5FjzA24L3QcI8+3fvyhL0bZFI 1smdJPotv5Ps9pdQ1vZodc4D2xyT98bs7VebvaeaCjU4A256iLk3cP/lt 64ku4OSA6JyPNkItHRD7f7R2xZ6o0IG+mFLZk5XbCVGmv6lcJ6xtk7F+R Fn5ri3mrk61THyrta6zNmOs7S/E7iBUOokOpjUsksmgIgaydlOaJshvD9 nWkg6tzwsfqlTAsDbe3oRBDiMVbPkvif8z/Xlc/0jKkvN8iNB57Y8cHtV g==; X-IronPort-AV: E=Sophos;i="5.90,219,1643644800"; d="scan'208";a="197429220" Received: from h199-255-45-14.hgst.com (HELO uls-op-cesaep01.wdc.com) ([199.255.45.14]) by ob1.hgst.iphmx.com with ESMTP; 29 Mar 2022 14:56:08 +0800 IronPort-SDR: 2I/470t9N5Z7unptV6eP6d0zsYG5+qDmhh50Cqap8wEH+/U2rSPNsaT+5mEHnvx8w535wzpaIC iRMID2Sy3gGPer/3Ivj5r4P0Utoy1DLkINnBVEidd1NlwVJTzUpgpRHGnD1rcEQI+HbtH9vodo GcTIp5yMvHPxMxmbdngYXFYYM5/bR9ATcCG2oW30tZUAHsuSyL2l7jLKaBnJ+xsHwwhy9U00CA OefGkgok3ZHubacS0sh553HSH0ImsCKyU65nbw+pZmXUjNgosN30/19Tn7VY9y1ggzJ8h8E6h8 YL3ptQrvcr37rTOiDaHjTszC Received: from uls-op-cesaip02.wdc.com ([10.248.3.37]) by uls-op-cesaep01.wdc.com with ESMTP/TLS/ECDHE-RSA-AES128-GCM-SHA256; 28 Mar 2022 23:27:52 -0700 IronPort-SDR: 4hN00kNPKO2fkHyAezDcWBXq/WqkODj+0wNeRhhZrrd19y8IQGa9vc/xuelUMdhUlRvQCtYVV1 VBVTpi0OBn9W6o+CTGjinxj5zSQj0anWodWPy4s3KTWYOQZXqkIveIfQri8XLYeZF0934EIYCf uL3Km/3/KTcf5ItFyTK40dC7jpNHjrrte4IfRPWpTO4lRPXDQPTr1oum0nK/yM9x8nMg3DMO3L vakfxsU4xIH3fMxddr3LMmR4rmItiY0oixliGCRFRPUaPtQ6k+lei5TQNAOJ1L/Ny3F0gzTRLk kog= WDCIronportException: Internal Received: from 2zx6353.ad.shared (HELO naota-xeon.wdc.com) ([10.225.48.64]) by uls-op-cesaip02.wdc.com with ESMTP; 28 Mar 2022 23:56:07 -0700 From: Naohiro Aota To: linux-btrfs@vger.kernel.org Cc: johannes.thumshirn@wdc.com, linux-fsdevel@vger.kernel.org, viro@zeniv.linux.org.uk, david@fromorbit.com, Naohiro Aota , Filipe Manana Subject: [PATCH v4 2/3] fs: add a check function for sb_start_write() Date: Tue, 29 Mar 2022 15:55:59 +0900 Message-Id: X-Mailer: git-send-email 2.35.1 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org Add a function sb_write_started() to return if sb_start_write() is properly called. It is used in the next commit. Reviewed-by: Filipe Manana Signed-off-by: Naohiro Aota --- include/linux/fs.h | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/include/linux/fs.h b/include/linux/fs.h index 27746a3da8fd..1f3df6e8a74d 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -1732,6 +1732,11 @@ static inline bool __sb_start_write_trylock(struct super_block *sb, int level) #define __sb_writers_release(sb, lev) \ percpu_rwsem_release(&(sb)->s_writers.rw_sem[(lev)-1], 1, _THIS_IP_) +static inline bool sb_write_started(const struct super_block *sb) +{ + return lockdep_is_held_type(sb->s_writers.rw_sem + SB_FREEZE_WRITE - 1, 1); +} + /** * sb_end_write - drop write access to a superblock * @sb: the super we wrote to