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 X-Spam-Level: X-Spam-Status: No, score=-17.7 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 92647C47094 for ; Mon, 7 Jun 2021 23:08:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 631C660C3E for ; Mon, 7 Jun 2021 23:08:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230261AbhFGXKo (ORCPT ); Mon, 7 Jun 2021 19:10:44 -0400 Received: from mail.kernel.org ([198.145.29.99]:39428 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230183AbhFGXKn (ORCPT ); Mon, 7 Jun 2021 19:10:43 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id A09C7610C7; Mon, 7 Jun 2021 23:08:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1623107331; bh=wDyQ0XIhQC/nWZhzrwbetfeCfr0gMMmAliRB2jRu/Ms=; h=Subject:To:Cc:References:From:Date:In-Reply-To:From; b=ptfpJ7UWOZ1tlbiFnldng8YtyYU5XfO246alFOntDWTj8FvvQA5N7nWWSjfu9/Etb VLoGkAP3YabH7ctrRxbSh2zSDsSmhO8PfLCpxKeVpB1Clh4MegiYpATIyFy57NNnfH Ls0oeEa9sZm03aAR2fBdBiK9C9xK/J3qmhW3YaV9OlZgRFY1PKU8CzSrzPwDEbuJ4w WB8SGTwES9hW9hIfZjKxt1PKQ80D1biOgqgkKp4U6GjHxQnR/j0RkpfB/e9E+gFwHq jlVTKMHC0C5skZBGd6iJTvuv7lcFqt8arl/p4bX1C5Vzu6NHLVPw7SPmXR1qMAq0t1 1/uflqHHeFY1Q== Subject: Re: [PATCH 1/2] f2fs: swap: remove dead codes To: Jaegeuk Kim Cc: Chao Yu , linux-f2fs-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org References: <20210526062927.52629-1-yuchao0@huawei.com> <21ec5a95-bdbc-358d-99c7-e75e91228039@huawei.com> <112bb86b-63eb-2249-6ad4-80a9ecdcdc67@kernel.org> From: Chao Yu Message-ID: <3272ecd0-f787-7751-3598-19ed8cb1c90f@kernel.org> Date: Tue, 8 Jun 2021 07:08:50 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2021/6/8 0:47, Jaegeuk Kim wrote: > On 06/07, Chao Yu wrote: >> On 2021/6/5 7:51, Jaegeuk Kim wrote: >>> On 06/04, Chao Yu wrote: >>>> On 2021/5/27 10:12, Chao Yu wrote: >>>>> On 2021/5/27 9:40, Jaegeuk Kim wrote: >>>>>> On 05/26, Chao Yu wrote: >>>>>>> On 2021/5/26 21:30, Jaegeuk Kim wrote: >>>>>>>> On 05/26, Chao Yu wrote: >>>>>>>>> After commit af4b6b8edf6a ("f2fs: introduce check_swap_activate_fast()"), >>>>>>>>> we will never run into original logic of check_swap_activate() before >>>>>>>>> f2fs supports non 4k-sized page, so let's delete those dead codes. >>>>>>>> >>>>>>>> Why not keeping this for large page support in future maybe? >>>>>>> >>>>>>> Well, if so, at that time, it would be better to refactor >>>>>>> check_swap_activate_fast() implementation based on f2fs_map_block() rather >>>>>>> than refactoring check_swap_activate() implementation based on low efficient >>>>>>> bmap()? >>>>>> >>>>>> Let's first check whether we support large page. Have you quickly tested it? >>>>>> If we support it now and current flow is just inefficient, I'd say keeping but >>>>>> refactoring it later. >>>>> >>>>> Let me check this, but I guess it missed to handle large page in lots of flows, >>>>> not sure where we may panic at... :( >>>> >>>> I've checked f2fs behavior on 64kb page size in arm64 vm, >>>> - 'ls -ls' will cause f2fs printing "invalid namelen(0), ino:%u, run fsck >>>> to fix." each time. >>>> - after touch a file and umount, fsck reports that image is corrupted. >>>> >>>> F2FS uses PAGE_SIZE and F2FS_BLKSIZE directly in a lot of places, I doubt >>>> most of places may not consider large page size condition. >>>> >>>> So, thoughts? I guess we have to admit we do not support 64KB page right >>>> now... :P >>> >>> Yeah, we need to block the large page support unfortunately. :( >> >> Could you please queue this series in dev-test? >> >> Thanks, >> >>> >>>> >>>> Thanks, >>>> >>>>> >>>>> Thanks, >>>>> >>>>>> >>>>>>> >>>>>>> Thanks, >>>>>>> >>>>>>>> >>>>>>>>> >>>>>>>>> Signed-off-by: Chao Yu >>>>>>>>> --- >>>>>>>>>    fs/f2fs/data.c | 171 +------------------------------------------------ >>>>>>>>>    1 file changed, 3 insertions(+), 168 deletions(-) >>>>>>>>> >>>>>>>>> diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c >>>>>>>>> index 3058c7e28b11..9c23fde93b76 100644 >>>>>>>>> --- a/fs/f2fs/data.c >>>>>>>>> +++ b/fs/f2fs/data.c >>>>>>>>> @@ -3830,67 +3830,7 @@ int f2fs_migrate_page(struct address_space *mapping, >>>>>>>>>    #endif >>>>>>>>>    #ifdef CONFIG_SWAP >>>>>>>>> -static int f2fs_is_file_aligned(struct inode *inode) >>>>>>>>> -{ >>>>>>>>> -    struct f2fs_sb_info *sbi = F2FS_I_SB(inode); >>>>>>>>> -    block_t main_blkaddr = SM_I(sbi)->main_blkaddr; >>>>>>>>> -    block_t cur_lblock; >>>>>>>>> -    block_t last_lblock; >>>>>>>>> -    block_t pblock; >>>>>>>>> -    unsigned long nr_pblocks; >>>>>>>>> -    unsigned int blocks_per_sec = BLKS_PER_SEC(sbi); >>>>>>>>> -    unsigned int not_aligned = 0; >>>>>>>>> -    int ret = 0; >>>>>>>>> - >>>>>>>>> -    cur_lblock = 0; >>>>>>>>> -    last_lblock = bytes_to_blks(inode, i_size_read(inode)); >>>>>>>>> - >>>>>>>>> -    while (cur_lblock < last_lblock) { >>>>>>>>> -        struct f2fs_map_blocks map; >>>>>>>>> - >>>>>>>>> -        memset(&map, 0, sizeof(map)); >>>>>>>>> -        map.m_lblk = cur_lblock; >>>>>>>>> -        map.m_len = last_lblock - cur_lblock; >>>>>>>>> -        map.m_next_pgofs = NULL; >>>>>>>>> -        map.m_next_extent = NULL; >>>>>>>>> -        map.m_seg_type = NO_CHECK_TYPE; >>>>>>>>> -        map.m_may_create = false; >>>>>>>>> - >>>>>>>>> -        ret = f2fs_map_blocks(inode, &map, 0, F2FS_GET_BLOCK_FIEMAP); >>>>>>>>> -        if (ret) >>>>>>>>> -            goto out; >>>>>>>>> - >>>>>>>>> -        /* hole */ >>>>>>>>> -        if (!(map.m_flags & F2FS_MAP_FLAGS)) { >>>>>>>>> -            f2fs_err(sbi, "Swapfile has holes\n"); >>>>>>>>> -            ret = -ENOENT; >>>>>>>>> -            goto out; >>>>>>>>> -        } >>>>>>>>> - >>>>>>>>> -        pblock = map.m_pblk; >>>>>>>>> -        nr_pblocks = map.m_len; >>>>>>>>> - >>>>>>>>> -        if ((pblock - main_blkaddr) & (blocks_per_sec - 1) || >>>>>>>>> -            nr_pblocks & (blocks_per_sec - 1)) { >>>>>>>>> -            if (f2fs_is_pinned_file(inode)) { >>>>>>>>> -                f2fs_err(sbi, "Swapfile does not align to section"); >>>>>>>>> -                ret = -EINVAL; >>>>>>>>> -                goto out; >>>>>>>>> -            } >>>>>>>>> -            not_aligned++; >>>>>>>>> -        } >>>>>>>>> - >>>>>>>>> -        cur_lblock += nr_pblocks; >>>>>>>>> -    } >>>>>>>>> -    if (not_aligned) >>>>>>>>> -        f2fs_warn(sbi, "Swapfile (%u) is not align to section: \n" >>>>>>>>> -            "\t1) creat(), 2) ioctl(F2FS_IOC_SET_PIN_FILE), 3) fallocate()", >>>>>>>>> -            not_aligned); >>>>>>>>> -out: >>>>>>>>> -    return ret; >>>>>>>>> -} >>>>>>>>> - >>>>>>>>> -static int check_swap_activate_fast(struct swap_info_struct *sis, >>>>>>>>> +static int check_swap_activate(struct swap_info_struct *sis, >>>>>>>>>                    struct file *swap_file, sector_t *span) >>>>>>>>>    { >>>>>>>>>        struct address_space *mapping = swap_file->f_mapping; >>>>>>>>> @@ -3907,6 +3847,8 @@ static int check_swap_activate_fast(struct swap_info_struct *sis, >>>>>>>>>        unsigned int not_aligned = 0; >>>>>>>>>        int ret = 0; >>>>>>>>> +    f2fs_bug_on(sbi, PAGE_SIZE != F2FS_BLKSIZE); > > Let me remove this, since we have this actually. Looks fine to me. Thanks, > > in init_f2fs_fs(), > > if (PAGE_SIZE != F2FS_BLKSIZE) { > printk("F2FS not supported on PAGE_SIZE(%lu) != %d\n", > PAGE_SIZE, F2FS_BLKSIZE); > return -EINVAL; > } > > > >>>>>>>>> + >>>>>>>>>        /* >>>>>>>>>         * Map all the blocks into the extent list.  This code doesn't try >>>>>>>>>         * to be very smart. >>>>>>>>> @@ -3986,113 +3928,6 @@ static int check_swap_activate_fast(struct swap_info_struct *sis, >>>>>>>>>        return ret; >>>>>>>>>    } >>>>>>>>> -/* Copied from generic_swapfile_activate() to check any holes */ >>>>>>>>> -static int check_swap_activate(struct swap_info_struct *sis, >>>>>>>>> -                struct file *swap_file, sector_t *span) >>>>>>>>> -{ >>>>>>>>> -    struct address_space *mapping = swap_file->f_mapping; >>>>>>>>> -    struct inode *inode = mapping->host; >>>>>>>>> -    struct f2fs_sb_info *sbi = F2FS_I_SB(inode); >>>>>>>>> -    unsigned blocks_per_page; >>>>>>>>> -    unsigned long page_no; >>>>>>>>> -    sector_t probe_block; >>>>>>>>> -    sector_t last_block; >>>>>>>>> -    sector_t lowest_block = -1; >>>>>>>>> -    sector_t highest_block = 0; >>>>>>>>> -    int nr_extents = 0; >>>>>>>>> -    int ret = 0; >>>>>>>>> - >>>>>>>>> -    if (PAGE_SIZE == F2FS_BLKSIZE) >>>>>>>>> -        return check_swap_activate_fast(sis, swap_file, span); >>>>>>>>> - >>>>>>>>> -    ret = f2fs_is_file_aligned(inode); >>>>>>>>> -    if (ret) >>>>>>>>> -        goto out; >>>>>>>>> - >>>>>>>>> -    blocks_per_page = bytes_to_blks(inode, PAGE_SIZE); >>>>>>>>> - >>>>>>>>> -    /* >>>>>>>>> -     * Map all the blocks into the extent list.  This code doesn't try >>>>>>>>> -     * to be very smart. >>>>>>>>> -     */ >>>>>>>>> -    probe_block = 0; >>>>>>>>> -    page_no = 0; >>>>>>>>> -    last_block = bytes_to_blks(inode, i_size_read(inode)); >>>>>>>>> -    while ((probe_block + blocks_per_page) <= last_block && >>>>>>>>> -            page_no < sis->max) { >>>>>>>>> -        unsigned block_in_page; >>>>>>>>> -        sector_t first_block; >>>>>>>>> -        sector_t block = 0; >>>>>>>>> - >>>>>>>>> -        cond_resched(); >>>>>>>>> - >>>>>>>>> -        block = probe_block; >>>>>>>>> -        ret = bmap(inode, &block); >>>>>>>>> -        if (ret) >>>>>>>>> -            goto out; >>>>>>>>> -        if (!block) >>>>>>>>> -            goto bad_bmap; >>>>>>>>> -        first_block = block; >>>>>>>>> - >>>>>>>>> -        /* >>>>>>>>> -         * It must be PAGE_SIZE aligned on-disk >>>>>>>>> -         */ >>>>>>>>> -        if (first_block & (blocks_per_page - 1)) { >>>>>>>>> -            probe_block++; >>>>>>>>> -            goto reprobe; >>>>>>>>> -        } >>>>>>>>> - >>>>>>>>> -        for (block_in_page = 1; block_in_page < blocks_per_page; >>>>>>>>> -                    block_in_page++) { >>>>>>>>> - >>>>>>>>> -            block = probe_block + block_in_page; >>>>>>>>> -            ret = bmap(inode, &block); >>>>>>>>> -            if (ret) >>>>>>>>> -                goto out; >>>>>>>>> -            if (!block) >>>>>>>>> -                goto bad_bmap; >>>>>>>>> - >>>>>>>>> -            if (block != first_block + block_in_page) { >>>>>>>>> -                /* Discontiguity */ >>>>>>>>> -                probe_block++; >>>>>>>>> -                goto reprobe; >>>>>>>>> -            } >>>>>>>>> -        } >>>>>>>>> - >>>>>>>>> -        first_block >>= (PAGE_SHIFT - inode->i_blkbits); >>>>>>>>> -        if (page_no) {    /* exclude the header page */ >>>>>>>>> -            if (first_block < lowest_block) >>>>>>>>> -                lowest_block = first_block; >>>>>>>>> -            if (first_block > highest_block) >>>>>>>>> -                highest_block = first_block; >>>>>>>>> -        } >>>>>>>>> - >>>>>>>>> -        /* >>>>>>>>> -         * We found a PAGE_SIZE-length, PAGE_SIZE-aligned run of blocks >>>>>>>>> -         */ >>>>>>>>> -        ret = add_swap_extent(sis, page_no, 1, first_block); >>>>>>>>> -        if (ret < 0) >>>>>>>>> -            goto out; >>>>>>>>> -        nr_extents += ret; >>>>>>>>> -        page_no++; >>>>>>>>> -        probe_block += blocks_per_page; >>>>>>>>> -reprobe: >>>>>>>>> -        continue; >>>>>>>>> -    } >>>>>>>>> -    ret = nr_extents; >>>>>>>>> -    *span = 1 + highest_block - lowest_block; >>>>>>>>> -    if (page_no == 0) >>>>>>>>> -        page_no = 1;    /* force Empty message */ >>>>>>>>> -    sis->max = page_no; >>>>>>>>> -    sis->pages = page_no - 1; >>>>>>>>> -    sis->highest_bit = page_no - 1; >>>>>>>>> -out: >>>>>>>>> -    return ret; >>>>>>>>> -bad_bmap: >>>>>>>>> -    f2fs_err(sbi, "Swapfile has holes\n"); >>>>>>>>> -    return -EINVAL; >>>>>>>>> -} >>>>>>>>> - >>>>>>>>>    static int f2fs_swap_activate(struct swap_info_struct *sis, struct file *file, >>>>>>>>>                    sector_t *span) >>>>>>>>>    { >>>>>>>>> -- >>>>>>>>> 2.29.2 >>>>>> . >>>>>> From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on 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linux-f2fs-devel@lists.sourceforge.net; Mon, 07 Jun 2021 23:09:05 +0000 Received: by mail.kernel.org (Postfix) with ESMTPSA id A09C7610C7; Mon, 7 Jun 2021 23:08:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1623107331; bh=wDyQ0XIhQC/nWZhzrwbetfeCfr0gMMmAliRB2jRu/Ms=; h=Subject:To:Cc:References:From:Date:In-Reply-To:From; b=ptfpJ7UWOZ1tlbiFnldng8YtyYU5XfO246alFOntDWTj8FvvQA5N7nWWSjfu9/Etb VLoGkAP3YabH7ctrRxbSh2zSDsSmhO8PfLCpxKeVpB1Clh4MegiYpATIyFy57NNnfH Ls0oeEa9sZm03aAR2fBdBiK9C9xK/J3qmhW3YaV9OlZgRFY1PKU8CzSrzPwDEbuJ4w WB8SGTwES9hW9hIfZjKxt1PKQ80D1biOgqgkKp4U6GjHxQnR/j0RkpfB/e9E+gFwHq jlVTKMHC0C5skZBGd6iJTvuv7lcFqt8arl/p4bX1C5Vzu6NHLVPw7SPmXR1qMAq0t1 1/uflqHHeFY1Q== To: Jaegeuk Kim References: <20210526062927.52629-1-yuchao0@huawei.com> <21ec5a95-bdbc-358d-99c7-e75e91228039@huawei.com> <112bb86b-63eb-2249-6ad4-80a9ecdcdc67@kernel.org> From: Chao Yu Message-ID: <3272ecd0-f787-7751-3598-19ed8cb1c90f@kernel.org> Date: Tue, 8 Jun 2021 07:08:50 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: Content-Language: en-US X-Headers-End: 1lqOMf-00Gfj6-Mz Subject: Re: [f2fs-dev] [PATCH 1/2] f2fs: swap: remove dead codes X-BeenThere: linux-f2fs-devel@lists.sourceforge.net X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-kernel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net Content-Transfer-Encoding: base64 Content-Type: text/plain; charset="utf-8"; Format="flowed" Errors-To: linux-f2fs-devel-bounces@lists.sourceforge.net T24gMjAyMS82LzggMDo0NywgSmFlZ2V1ayBLaW0gd3JvdGU6Cj4gT24gMDYvMDcsIENoYW8gWXUg d3JvdGU6Cj4+IE9uIDIwMjEvNi81IDc6NTEsIEphZWdldWsgS2ltIHdyb3RlOgo+Pj4gT24gMDYv MDQsIENoYW8gWXUgd3JvdGU6Cj4+Pj4gT24gMjAyMS81LzI3IDEwOjEyLCBDaGFvIFl1IHdyb3Rl Ogo+Pj4+PiBPbiAyMDIxLzUvMjcgOTo0MCwgSmFlZ2V1ayBLaW0gd3JvdGU6Cj4+Pj4+PiBPbiAw 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