From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 1D18F23A9 for ; Tue, 22 Oct 2024 02:53:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729565597; cv=none; b=JxkIWdksGyWZ0YaVX4WKTdhia1uKTA8weE6C2DuX04GgxDHP8R1ON2Ivyaa9QcuYRgyyH+dgCZrbXYVOF/KNzxOYt9ZYJUuC0WlUp/Ba7gBrBncfZP//8rsmFb63hGvZutnm8uw6SD/RVaAmgB7ZaZTyrHwHlaf13jfgJYMHWaE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729565597; c=relaxed/simple; bh=sNTXpWjfoKvwLxtmQeFQxt8wmx98bEnvCNRQlkYhr7M=; h=Message-ID:Date:MIME-Version:Cc:Subject:To:References:From: In-Reply-To:Content-Type; b=X4HWyVg5GV6dJfCg41orcQd2sVweuFzevsWDsdtbtj6VPiqU2hqV/eKRipZkp+mJ0nQdp0sM3NNW/0u7UW5BbD69rCCxLPtM8uiFEpkycT098cYzChgvLWJbr95feVH7YkIyCwdUjXg5NKugr2yVa3N8YvJJKehgo25hZ1NRPjo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=p2rfxzi4; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="p2rfxzi4" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 83B26C4CEC3; Tue, 22 Oct 2024 02:53:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1729565596; bh=sNTXpWjfoKvwLxtmQeFQxt8wmx98bEnvCNRQlkYhr7M=; h=Date:Cc:Subject:To:References:From:In-Reply-To:From; b=p2rfxzi4qTw+Pxla/E70st1xsXxeytMvQwgbOf9JyPSP/rlz3z/RJxiJ9WUEWZlsc gAbYc/tICz8A+3CEmhivclaIzR43Y73xFTWtrlwWE2UPPkGej1AIw8rZIcyjAmZGPp VEl+MMeHArPR5cFyfJ43z3G4rmpBUSa2n7hscGBHSFL7tqbanhQvrTYN8rgimP1xsV Hrrc4zYSfZc/qkkP8gdKUwg25KFJibAyJlk07YMzRXa4f8E2nEph7R4Fq2Ak5qPvAr GsniNGY0k4xXbDvqmeRQiwmnOnD8/00zX9dy/9n+GbbyzvELnqeT2qivxlJ2NiwI4k RWmz0FwMS0p0Q== Message-ID: <3fdd8fdd-8b80-4989-8cfd-78051bd85936@kernel.org> Date: Tue, 22 Oct 2024 10:53:13 +0800 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Cc: Chao Yu , linux-f2fs-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org Subject: Re: [PATCH] f2fs: modify f2fs_is_checkpoint_ready logic to allow more data to be written with the CP disable To: Qi Han , jaegeuk@kernel.org References: <20241009102745.1390935-1-hanqi@vivo.com> Content-Language: en-US From: Chao Yu In-Reply-To: <20241009102745.1390935-1-hanqi@vivo.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 2024/10/9 18:27, Qi Han wrote: > When the free segment is used up during CP disable, many write or > ioctl operations will get ENOSPC error codes, even if there are > still many blocks available. We can reproduce it in the following > steps: > > dd if=/dev/zero of=f2fs.img bs=1M count=55 > mkfs.f2fs -f f2fs.img > mount f2fs.img f2fs_dir -o checkpoint=disable:10% > cd f2fs_dir > dd if=/dev/zero of=bigfile bs=1M count=50 > sync > rm bigfile > i=1; while [[ $i -lt 10000000 ]]; do (file_name=./file$i; dd \ > if=/dev/random of=$file_name bs=1M count=0); i=$((i+1)); done > stat -f ./ > > In f2fs_need_SSR() function, it is allowed to use SSR to allocate > blocks when CP is disabled, so in f2fs_is_checkpoint_ready function, > can we judge the number of invalid blocks when free segment is not > enough, and return ENOSPC only if the number of invalid blocks is > also not enough? > > Signed-off-by: Qi Han > --- > fs/f2fs/segment.h | 21 +++++++++++++++++++++ > 1 file changed, 21 insertions(+) > > diff --git a/fs/f2fs/segment.h b/fs/f2fs/segment.h > index 71adb4a43bec..9bf0cf3a6a31 100644 > --- a/fs/f2fs/segment.h > +++ b/fs/f2fs/segment.h > @@ -637,12 +637,33 @@ static inline bool has_enough_free_secs(struct f2fs_sb_info *sbi, > return !has_not_enough_free_secs(sbi, freed, needed); > } > > +static inline bool has_enough_available_blocks(struct f2fs_sb_info *sbi) > +{ > + unsigned int total_free_blocks = sbi->user_block_count - > + valid_user_blocks(sbi) - > + sbi->current_reserved_blocks; > + > + if (total_free_blocks <= sbi->unusable_block_count) > + total_free_blocks = 0; > + else > + total_free_blocks -= sbi->unusable_block_count; > + > + if (total_free_blocks > F2FS_OPTION(sbi).root_reserved_blocks) > + total_free_blocks -= F2FS_OPTION(sbi).root_reserved_blocks; > + else > + total_free_blocks = 0; > + > + return (total_free_blocks > 0) ? true : false; Can you please reuse get_available_block_count() as much as possible? and cover it w/ stat_lock? Thanks, > +} > + > static inline bool f2fs_is_checkpoint_ready(struct f2fs_sb_info *sbi) > { > if (likely(!is_sbi_flag_set(sbi, SBI_CP_DISABLED))) > return true; > if (likely(has_enough_free_secs(sbi, 0, 0))) > return true; > + if (likely(has_enough_available_blocks(sbi))) > + return true; > return false; > } >