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Thu, 27 Aug 2026 07:16:44 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9EE4C1F000E9; Thu, 27 Aug 2026 07:16:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1787815004; bh=tPLA3RkuZIumhqwSS/uvWPLXsqpPYd79cJpclLT4Fp8=; h=Date:Cc:Subject:To:References:From:In-Reply-To; b=Q/aitK2EKCPBCQex7Y9h20PK2mKieT3UXBrcRiKhR2IawZYvsgySRaf6NibTCBgx3 VqHGbm9x1FcwEf/Q43Bc61yefaI1I0z08Okeb/5+N8zgg5iM2MqiN1AiYKPcu0ZR1z 3id5UQ9jm9bmvRgAgd/3bIU85pzi2L/LoZTrcaMmXV+RMciVoyv6KRUMH3AdlBIorS BUFRW2G5Q2FnkIa36Ef3Sxryum7mvV/d/R94mPD5teFSsp7mpE7bSQQpsqzpQvpnjT /Fr1DexZj03HlIn/0zpgzEi5QPCZwkXHlXyftCIAaZ4wf6Wz1Ibc1IpPr+tqKoSsba xzl1aLwGtqP8g== Message-ID: <3771dfee-db35-4af4-a15d-28b8fa98fe96@kernel.org> Date: Thu, 27 Aug 2026 15:16:41 +0800 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird To: Nanzhe Zhao , linux-f2fs-devel@lists.sourceforge.net, Jaegeuk Kim References: <20260826082641.2007658-1-zhaonanzhe@xiaomi.com> <20260826082641.2007658-3-zhaonanzhe@xiaomi.com> Content-Language: en-US In-Reply-To: <20260826082641.2007658-3-zhaonanzhe@xiaomi.com> X-Headers-End: 1wzULy-0005mj-6u Subject: Re: [f2fs-dev] [PATCH 02/14] f2fs: carry subpage offset and count in write IO 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: , From: Chao Yu via Linux-f2fs-devel Reply-To: Chao Yu Cc: Barry Song , Juan Yescas , Dev Jain , linux-kernel@vger.kernel.org, David Hildenbrand , Bo Zhang , Kalesh Singh , Nanzhe Zhao , Pengfei Li , Ryan Roberts Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: linux-f2fs-devel-bounces@lists.sourceforge.net On 8/26/26 16:26, Nanzhe Zhao wrote: > Large folio write paths need to submit I/O for a range inside a > folio instead of always submitting the whole folio from offset zero. > Add folio_offset and folio_blkcnt to f2fs_io_info to describe the > block offset inside the folio and the number of contiguous blocks > covered by the I/O. > > Apply the new fields to the bio submit paths that need the subpage > offset or contiguous block count. > > Signed-off-by: Nanzhe Zhao > --- > fs/f2fs/data.c | 59 ++++++++++++++++++++++++++++++++--------------- > fs/f2fs/f2fs.h | 11 +++++++++ > fs/f2fs/segment.c | 3 ++- > 3 files changed, 54 insertions(+), 19 deletions(-) > > diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c > index 578a90d427e2..8649d443ca74 100644 > --- a/fs/f2fs/data.c > +++ b/fs/f2fs/data.c > @@ -783,6 +783,9 @@ int f2fs_submit_page_bio(struct f2fs_io_info *fio) > struct folio *fio_folio = fio->folio; > struct folio *data_folio = fio->encrypted_page ? > page_folio(fio->encrypted_page) : fio_folio; > + pgoff_t fio_lblk = F2FS_FIO_LBLK(fio_folio, fio); > + size_t bio_offset = F2FS_FIO_BIO_OFFSET(fio); > + size_t bio_len = F2FS_FIO_BIO_SIZE(fio); > > if (!f2fs_is_valid_blkaddr(fio->sbi, fio->new_blkaddr, > fio->is_por ? META_POR : (__is_meta_io(fio) ? > @@ -795,11 +798,11 @@ int f2fs_submit_page_bio(struct f2fs_io_info *fio) > bio = __bio_alloc(fio, 1); > > f2fs_set_bio_crypt_ctx(bio, fio_folio->mapping->host, > - fio_folio->index, fio, GFP_NOIO); > - bio_add_folio_nofail(bio, data_folio, folio_size(data_folio), 0); > + fio_lblk, fio, GFP_NOIO); > + bio_add_folio_nofail(bio, data_folio, bio_len, bio_offset); > > if (fio->io_wbc && !is_read_io(fio->op)) > - wbc_account_cgroup_owner(fio->io_wbc, fio_folio, PAGE_SIZE); > + wbc_account_cgroup_owner(fio->io_wbc, fio_folio, bio_len); > > inc_page_count(fio->sbi, is_read_io(fio->op) ? > __read_io_type(data_folio) : WB_DATA_TYPE(fio->folio, false)); > @@ -844,7 +847,8 @@ static bool io_is_mergeable(struct f2fs_sb_info *sbi, struct bio *bio, > } > > static void add_bio_entry(struct f2fs_sb_info *sbi, struct bio *bio, > - struct folio *folio, enum temp_type temp) > + struct folio *folio, size_t len, size_t offset, > + enum temp_type temp) > { > struct f2fs_bio_info *io = sbi->write_io[DATA] + temp; > struct bio_entry *be; > @@ -853,7 +857,7 @@ static void add_bio_entry(struct f2fs_sb_info *sbi, struct bio *bio, > be->bio = bio; > bio_get(bio); > > - bio_add_folio_nofail(bio, folio, folio_size(folio), 0); > + bio_add_folio_nofail(bio, folio, len, offset); > > f2fs_down_write(&io->bio_list_lock); > list_add_tail(&be->list, &io->bio_list); > @@ -870,6 +874,9 @@ static int add_ipu_page(struct f2fs_io_info *fio, struct bio **bio, > struct folio *folio) > { > struct folio *fio_folio = fio->folio; > + pgoff_t fio_lblk = F2FS_FIO_LBLK(fio_folio, fio); > + size_t bio_offset = F2FS_FIO_BIO_OFFSET(fio); > + size_t bio_len = F2FS_FIO_BIO_SIZE(fio); > struct f2fs_sb_info *sbi = fio->sbi; > enum temp_type temp; > bool found = false; > @@ -892,8 +899,8 @@ static int add_ipu_page(struct f2fs_io_info *fio, struct bio **bio, > fio->new_blkaddr)); > if (f2fs_crypt_mergeable_bio(*bio, > fio_folio->mapping->host, > - fio_folio->index, fio) && > - bio_add_folio(*bio, folio, folio_size(folio), 0)) { > + fio_lblk, fio) && > + bio_add_folio(*bio, folio, bio_len, bio_offset)) { > ret = 0; > break; > } > @@ -1007,6 +1014,10 @@ int f2fs_merge_page_bio(struct f2fs_io_info *fio) > struct folio *data_folio = fio->encrypted_page ? > page_folio(fio->encrypted_page) : fio->folio; > struct folio *folio = fio->folio; > + pgoff_t fio_lblk = F2FS_FIO_LBLK(folio, fio); > + unsigned int fio_cnt = F2FS_FIO_BLKCNT(fio); > + size_t bio_offset = F2FS_FIO_BIO_OFFSET(fio); > + size_t bio_len = F2FS_FIO_BIO_SIZE(fio); > > if (!f2fs_is_valid_blkaddr(fio->sbi, fio->new_blkaddr, > __is_meta_io(fio) ? META_GENERIC : DATA_GENERIC)) > @@ -1021,9 +1032,10 @@ int f2fs_merge_page_bio(struct f2fs_io_info *fio) > if (!bio) { > bio = __bio_alloc(fio, BIO_MAX_VECS); > f2fs_set_bio_crypt_ctx(bio, folio->mapping->host, > - folio->index, fio, GFP_NOIO); > + fio_lblk, fio, GFP_NOIO); > > - add_bio_entry(fio->sbi, bio, data_folio, fio->temp); > + add_bio_entry(fio->sbi, bio, data_folio, bio_len, > + bio_offset, fio->temp); > } else { > if (add_ipu_page(fio, &bio, data_folio)) > goto alloc_new; > @@ -1034,7 +1046,7 @@ int f2fs_merge_page_bio(struct f2fs_io_info *fio) > > inc_page_count(fio->sbi, WB_DATA_TYPE(folio, false)); > > - *fio->last_block = fio->new_blkaddr; > + *fio->last_block = fio->new_blkaddr + fio_cnt - 1; > *fio->bio = bio; > > return 0; > @@ -1070,6 +1082,10 @@ void f2fs_submit_page_write(struct f2fs_io_info *fio) > struct folio *bio_folio; > struct f2fs_lock_context lc; > enum count_type type; > + pgoff_t fio_lblk; > + unsigned int fio_cnt; > + size_t bio_offset; > + size_t bio_len; > > f2fs_bug_on(sbi, is_read_io(fio->op)); > > @@ -1108,6 +1124,9 @@ void f2fs_submit_page_write(struct f2fs_io_info *fio) > /* set submitted = true as a return value */ > fio->submitted = 1; > > + fio_lblk = F2FS_FIO_LBLK(fio->folio, fio); > + fio_cnt = F2FS_FIO_BLKCNT(fio); > + > type = WB_DATA_TYPE(bio_folio, fio->compressed_page); > inc_page_count(sbi, type); > > @@ -1115,26 +1134,28 @@ void f2fs_submit_page_write(struct f2fs_io_info *fio) > (!io_is_mergeable(sbi, io->bio, io, fio, io->last_block_in_bio, > fio->new_blkaddr) || > !f2fs_crypt_mergeable_bio(io->bio, fio_inode(fio), > - bio_folio->index, fio))) > + fio_lblk, fio))) > __submit_merged_bio(io); > alloc_new: > if (io->bio == NULL) { > io->bio = __bio_alloc(fio, BIO_MAX_VECS); > f2fs_set_bio_crypt_ctx(io->bio, fio_inode(fio), > - bio_folio->index, fio, GFP_NOIO); > + fio_lblk, fio, GFP_NOIO); > io->fio = *fio; > } > > - if (!bio_add_folio(io->bio, bio_folio, folio_size(bio_folio), 0)) { > + bio_offset = F2FS_FIO_BIO_OFFSET(fio); > + bio_len = F2FS_FIO_BIO_SIZE(fio); > + > + if (!bio_add_folio(io->bio, bio_folio, bio_len, bio_offset)) { > __submit_merged_bio(io); > goto alloc_new; > } > > if (fio->io_wbc) > - wbc_account_cgroup_owner(fio->io_wbc, fio->folio, > - folio_size(fio->folio)); > + wbc_account_cgroup_owner(fio->io_wbc, fio->folio, bio_len); > > - io->last_block_in_bio = fio->new_blkaddr; > + io->last_block_in_bio = fio->new_blkaddr + fio_cnt - 1; > > trace_f2fs_submit_folio_write(fio->folio, fio); > #ifdef CONFIG_BLK_DEV_ZONED > @@ -3039,7 +3060,8 @@ int f2fs_do_write_data_page(struct f2fs_io_info *fio) > set_new_dnode(&dn, inode, NULL, NULL, 0); > > if (need_inplace_update(fio) && > - f2fs_lookup_read_extent_cache_block(inode, folio->index, > + f2fs_lookup_read_extent_cache_block(inode, > + F2FS_FIO_LBLK(folio, fio), > &fio->old_blkaddr)) { > if (!f2fs_is_valid_blkaddr(fio->sbi, fio->old_blkaddr, > DATA_GENERIC_ENHANCE)) > @@ -3058,7 +3080,8 @@ int f2fs_do_write_data_page(struct f2fs_io_info *fio) > if (fio->need_lock == LOCK_REQ && !f2fs_trylock_op(fio->sbi, &lc)) > return -EAGAIN; > > - err = f2fs_get_dnode_of_data(&dn, folio->index, LOOKUP_NODE); > + err = f2fs_get_dnode_of_data(&dn, F2FS_FIO_LBLK(folio, fio), > + LOOKUP_NODE); > if (err) > goto out; > > diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h > index 2e8f85cea6d0..31ddd321daf6 100644 > --- a/fs/f2fs/f2fs.h > +++ b/fs/f2fs/f2fs.h > @@ -1357,6 +1357,8 @@ struct f2fs_io_info { > blk_opf_t op_flags; /* req_flag_bits */ > block_t new_blkaddr; /* new block address to be written */ > block_t old_blkaddr; /* old block address before Cow */ > + pgoff_t folio_offset; /* offset in large folio */ > + unsigned int folio_blkcnt; /* block count in large folio */ > union { > struct page *page; /* page to be written */ > struct folio *folio; > @@ -1378,6 +1380,15 @@ struct f2fs_io_info { > sector_t *last_block; /* last block number in bio */ > }; > > +#define F2FS_FIO_LBLK(folio, fio) \ > + ((folio)->index + (fio)->folio_offset) #define F2FS_FIO_LBLK(fio) \ (((fio)->folio)->index + (fio)->folio_offset) > +#define F2FS_FIO_BLKCNT(fio) \ > + ((fio)->folio_blkcnt ? (fio)->folio_blkcnt : 1) Hmm, it's better to not leaving fio.folio_blkcnt as zero, can we set fio.folio_blkcnt to 1 by default? and use fio->folio_blkcnt. Thanks, > +#define F2FS_FIO_BIO_OFFSET(fio) \ > + ((fio)->folio_offset << PAGE_SHIFT) > +#define F2FS_FIO_BIO_SIZE(fio) \ > + F2FS_BLK_TO_BYTES(F2FS_FIO_BLKCNT(fio)) > + > struct bio_entry { > struct bio *bio; > struct list_head list; > diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c > index df10119d94ad..5bb1e51a38a0 100644 > --- a/fs/f2fs/segment.c > +++ b/fs/f2fs/segment.c > @@ -3816,7 +3816,8 @@ static int __get_segment_type_6(struct f2fs_io_info *fio) > if (file_is_cold(inode) || f2fs_need_compress_data(inode)) > return CURSEG_COLD_DATA; > > - type = __get_age_segment_type(inode, fio->folio->index); > + type = __get_age_segment_type(inode, > + F2FS_FIO_LBLK(fio->folio, fio)); > if (type != NO_CHECK_TYPE) > return type; > _______________________________________________ Linux-f2fs-devel mailing list Linux-f2fs-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel