From mboxrd@z Thu Jan 1 00:00:00 1970 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 CDBD9C76196 for ; Tue, 11 Apr 2023 16:58:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229598AbjDKQ62 (ORCPT ); Tue, 11 Apr 2023 12:58:28 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40070 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229647AbjDKQ6W (ORCPT ); Tue, 11 Apr 2023 12:58:22 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 112115269 for ; Tue, 11 Apr 2023 09:58:20 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 950D5621F0 for ; Tue, 11 Apr 2023 16:58:19 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id DE4D4C433EF; Tue, 11 Apr 2023 16:58:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1681232299; bh=PIuBueFuizxDxX4lJnpDE3pr3ApvuOEeLShaHwfYbOM=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=Ed4aF71ezAFa0//i0i6fLWtruR3eUgmzyzzZVo7B7U++1fZqxukDN+qXRRRTL9hd4 cZNQtNcTk9UKijEyNI586L4Qw1nItwW5XjeKtGZvVgkAhfBj+D8PFslSWjUNtW6Xws 1bFHbTApAr0lrR1l114srXm8v2jmK3i9gWMevKEMrM0F+WQBLbEQ9zO0xMNFO0lncz p/yHdZ0cx7ItaJS0oN50mUB2vrS+mPfMH51IGC/C2nffdW+nOHta2l3MOa65EV+VWA 9tWHW2ssE+9Yi7SORgriuMAdwRyQRsYc8pxsxt/9qc1hklt5DRdA/mrVg/mecA14m2 MGqqyL08Cm1Eg== Date: Tue, 11 Apr 2023 09:58:17 -0700 From: Jaegeuk Kim To: Chao Yu Cc: linux-f2fs-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org Subject: Re: [PATCH 1/2] f2fs: remove folio_detach_private() in .invalidate_folio and .release_folio Message-ID: References: <20230410022418.1843178-1-chao@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 04/11, Chao Yu wrote: > On 2023/4/11 2:33, Jaegeuk Kim wrote: > > On 04/10, Chao Yu wrote: > > > We have maintain PagePrivate and page_private and page reference > > > w/ {set,clear}_page_private_*, it doesn't need to call > > > folio_detach_private() in the end of .invalidate_folio and > > > .release_folio, remove it and use f2fs_bug_on instead. > > > > > > Signed-off-by: Chao Yu > > > --- > > > fs/f2fs/data.c | 7 +++++-- > > > 1 file changed, 5 insertions(+), 2 deletions(-) > > > > > > diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c > > > index 4946df6dd253..8b179b4bdc03 100644 > > > --- a/fs/f2fs/data.c > > > +++ b/fs/f2fs/data.c > > > @@ -3737,7 +3737,8 @@ void f2fs_invalidate_folio(struct folio *folio, size_t offset, size_t length) > > > inode->i_ino == F2FS_COMPRESS_INO(sbi)) > > > clear_page_private_data(&folio->page); > > > - folio_detach_private(folio); > > > + f2fs_bug_on(sbi, PagePrivate(&folio->page)); > > > + f2fs_bug_on(sbi, page_private(&folio->page)); > > > > I think we can just check page_private() only. > > Why? how about the case PagePrivate was set, but page_private was't? It must > be a bug as well? Given the code, I think both are set all the time. My concern is someone is not doing set/get properly. Actually, I got a panic on page_private() when running fsstress overnight. I'm trying to reproduce it to find which bit was set. > > Thanks, > > > > > > } > > > bool f2fs_release_folio(struct folio *folio, gfp_t wait) > > > @@ -3759,7 +3760,9 @@ bool f2fs_release_folio(struct folio *folio, gfp_t wait) > > > clear_page_private_reference(&folio->page); > > > clear_page_private_gcing(&folio->page); > > > - folio_detach_private(folio); > > > + f2fs_bug_on(sbi, PagePrivate(&folio->page)); > > > + f2fs_bug_on(sbi, page_private(&folio->page)); > > > + > > > return true; > > > } > > > -- > > > 2.25.1