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Thu, 22 Oct 2026 00:54:10 -0700 (PDT) Received: from nzzhao-ThinkCentre-M760t.mioffice.cn ([43.224.245.179]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-3ada4896c71sm3202562a91.6.2026.10.22.00.54.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 22 Oct 2026 00:54:10 -0700 (PDT) From: Nanzhe Zhao To: linux-f2fs-devel@lists.sourceforge.net, Jaegeuk Kim , Chao Yu Cc: Barry Song , Juan Yescas , Daeho Jeong , Pengfei Li , Dev Jain , David Hildenbrand , linux-kernel@vger.kernel.org, Bo Zhang , Kalesh Singh , Nanzhe Zhao , Nanzhe Zhao , Ryan Roberts Subject: [PATCH v6 05/15] f2fs: support large folio writeback Date: Thu, 22 Oct 2026 15:53:32 +0800 Message-ID: <20261022075343.3043003-6-nzzhao.sigma@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20261022075343.3043003-1-nzzhao.sigma@gmail.com> References: <20261022075343.3043003-1-nzzhao.sigma@gmail.com> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Nanzhe Zhao Large folio can contain multiple dirty ranges. Add a folio-based writeback path for large-folio mapping files and keep the legacy f2fs_write_cache_pages() path unchanged for non large-folio mapping files. Signed-off-by: Nanzhe Zhao --- fs/f2fs/data.c | 521 +++++++++++++++++++++++++++++++++++++++++++++- fs/f2fs/segment.c | 8 +- 2 files changed, 521 insertions(+), 8 deletions(-) diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c index e3d6e3087bb9..74583f0f1833 100644 --- a/fs/f2fs/data.c +++ b/fs/f2fs/data.c @@ -358,6 +358,49 @@ static void f2fs_cache_write_end_bio(struct bio *bio) bio_put(bio); } +static bool f2fs_ffs_has_dirty_subpage(struct folio *folio) +{ + struct f2fs_folio_state *ffs; + unsigned long flags; + unsigned int nr_subpages; + bool dirty; + + if (!f2fs_folio_has_ffs(folio)) + return false; + + ffs = (struct f2fs_folio_state *)folio->private; + nr_subpages = folio_nr_pages(folio); + + spin_lock_irqsave(&ffs->state_lock, flags); + dirty = find_next_bit(ffs->state, 2 * nr_subpages, + nr_subpages) < 2 * nr_subpages; + spin_unlock_irqrestore(&ffs->state_lock, flags); + + return dirty; +} + +/* + * Drop a write page pending of @folio. When the last pending is gone, + * clear PAGE_PRIVATE_GCING if no dirty subpage is left, and end + * writeback if it was started. + */ +static void f2fs_ffs_put_write_pending(struct folio *folio, unsigned int nr) +{ + struct f2fs_folio_state *ffs; + + if (!f2fs_folio_has_ffs(folio)) + goto release; + + ffs = (struct f2fs_folio_state *)folio->private; + if (!atomic_sub_and_test(nr, &ffs->write_pages_pending)) + return; +release: + if (!f2fs_ffs_has_dirty_subpage(folio)) + folio_clear_f2fs_gcing(folio); + if (folio_test_writeback(folio)) + folio_end_writeback(folio); +} + static void f2fs_write_end_bio(struct bio *bio) { struct f2fs_sb_info *sbi = bio->bi_private; @@ -373,6 +416,8 @@ static void f2fs_write_end_bio(struct bio *bio) bio_for_each_folio_all(fi, bio) { struct folio *folio = fi.folio; + unsigned int nr_pages = fi.length >> PAGE_SHIFT; + unsigned int npages = nr_pages; enum count_type type; #ifdef CONFIG_F2FS_FS_COMPRESSION @@ -392,7 +437,8 @@ static void f2fs_write_end_bio(struct bio *bio) } } - dec_cache_count(sbi, type); + while (nr_pages--) + dec_cache_count(sbi, type); /* * we should access sbi before folio_end_writeback() to @@ -402,8 +448,7 @@ static void f2fs_write_end_bio(struct bio *bio) wq_has_sleeper(&sbi->cp_wait)) wake_up(&sbi->cp_wait); - folio_clear_f2fs_gcing(folio); - folio_end_writeback(folio); + f2fs_ffs_put_write_pending(folio, npages); } bio_put(bio); @@ -2922,7 +2967,7 @@ static unsigned int __ffs_mark_subrange_dirty(struct folio *folio, return bitmap_weight(ffs->state, 2 * nr_subpages) - before; } -static void f2fs_ffs_mark_subrange_dirty(struct folio *folio, +void f2fs_ffs_mark_subrange_dirty(struct folio *folio, size_t offset, size_t len) { struct f2fs_folio_state *ffs; @@ -2940,6 +2985,99 @@ static void f2fs_ffs_mark_subrange_dirty(struct folio *folio, spin_unlock_irqrestore(&ffs->state_lock, flags); } +static bool __ffs_clear_subrange_dirty(struct folio *folio, + struct f2fs_folio_state *ffs, size_t offset, size_t len) +{ + unsigned int nr_subpages = folio_nr_pages(folio); + unsigned int start, end; + + start = offset >> PAGE_SHIFT; + end = (offset + len + PAGE_SIZE - 1) >> PAGE_SHIFT; + end = min(end, nr_subpages); + + bitmap_clear(ffs->state, nr_subpages + start, end - start); + return find_next_bit(ffs->state, 2 * nr_subpages, nr_subpages) < + 2 * nr_subpages; +} + +/** + * f2fs_ffs_clear_subrange_dirty_and_test - clear dirty bits and test remaining + * @folio: the large folio + * @offset: start byte offset within the folio + * @len: byte length of the subrange + * + * Clear the dirty bits of the 4K subpages covered by [offset, offset + len), + * and return whether the folio still has any dirty subpage left. + */ +bool f2fs_ffs_clear_subrange_dirty_and_test(struct folio *folio, size_t offset, + size_t len) +{ + struct f2fs_folio_state *ffs; + unsigned long flags; + bool dirty; + + if (!f2fs_folio_has_ffs(folio)) + return false; + + ffs = (struct f2fs_folio_state *)folio->private; + spin_lock_irqsave(&ffs->state_lock, flags); + dirty = __ffs_clear_subrange_dirty(folio, ffs, offset, len); + spin_unlock_irqrestore(&ffs->state_lock, flags); + + return dirty; +} + +static unsigned int ffs_next_dirty_subpage(struct f2fs_folio_state *ffs, + const struct folio *folio, unsigned int start, + unsigned int end) +{ + unsigned int nr_subpages = folio_nr_pages(folio); + + return find_next_bit(ffs->state, nr_subpages + end + 1, + nr_subpages + start) - nr_subpages; +} + +static unsigned int ffs_next_clean_subpage(struct f2fs_folio_state *ffs, + const struct folio *folio, unsigned int start, + unsigned int end) +{ + unsigned int nr_subpages = folio_nr_pages(folio); + + return find_next_zero_bit(ffs->state, nr_subpages + end + 1, + nr_subpages + start) - nr_subpages; +} + +static unsigned int ffs_find_dirty_range(struct folio *folio, + u64 *range_start, u64 range_end) +{ + struct f2fs_folio_state *ffs; + unsigned int start, end, nr_pages; + + if (*range_start >= range_end) + return 0; + + if (!f2fs_folio_has_ffs(folio)) + return range_end - *range_start; + + ffs = (struct f2fs_folio_state *)folio->private; + start = offset_in_folio(folio, *range_start) >> PAGE_SHIFT; + end = DIV_ROUND_UP(min_not_zero(offset_in_folio(folio, range_end), + folio_size(folio)), PAGE_SIZE) - 1; + + start = ffs_next_dirty_subpage(ffs, folio, start, end); + if (start > end) + return 0; + + if (start == end) + nr_pages = 1; + else + nr_pages = ffs_next_clean_subpage(ffs, folio, + start + 1, end) - start; + + *range_start = folio_pos(folio) + ((u64)start << PAGE_SHIFT); + return (u64)nr_pages << PAGE_SHIFT; +} + static bool find_next_valid_block(const struct folio *folio, size_t orig_off, size_t *need_off, size_t len) @@ -3477,7 +3615,7 @@ int f2fs_do_write_data_page(struct f2fs_io_info *fio) if (ipu_force || (__is_valid_data_blkaddr(fio->old_blkaddr) && need_inplace_update(fio))) { - folio_start_writeback(folio); + __folio_start_writeback(folio, folio_test_dirty(folio)); f2fs_put_dnode(&dn); if (fio->need_lock == LOCK_REQ) f2fs_unlock_op(fio->sbi, &lc); @@ -3504,7 +3642,7 @@ int f2fs_do_write_data_page(struct f2fs_io_info *fio) fio->version = ni.version; - folio_start_writeback(folio); + __folio_start_writeback(folio, folio_test_dirty(folio)); if (fio->compr_blocks && fio->old_blkaddr == COMPRESS_ADDR) f2fs_i_compr_blocks_update(inode, fio->compr_blocks - 1, false); @@ -3512,6 +3650,13 @@ int f2fs_do_write_data_page(struct f2fs_io_info *fio) /* LFS mode write path */ f2fs_outplace_write_data(&dn, fio); trace_f2fs_do_write_data_page(folio, OPU); + /* + * The outplace write path failed to submit this block. + */ + if (!fio->submitted) { + err = -EIO; + goto out_writepage; + } set_inode_flag(inode, FI_APPEND_WRITE); if (atomic_commit) folio_clear_f2fs_atomic(folio); @@ -3523,6 +3668,144 @@ int f2fs_do_write_data_page(struct f2fs_io_info *fio) return err; } +static int f2fs_write_folio_dirty_range(struct folio *folio, int *submitted, + struct writeback_control *wbc, + enum iostat_type io_type, + u64 *pos, u64 len) +{ + struct inode *inode = folio->mapping->host; + struct f2fs_sb_info *sbi = F2FS_I_SB(inode); + bool atomic_commit = f2fs_is_atomic_file(inode) && + folio_test_f2fs_atomic(folio); + struct inode *dn_inode = atomic_commit ? + F2FS_I(inode)->cow_inode : inode; + struct f2fs_folio_state *ffs = NULL; + u64 folio_start = folio_pos(folio); + pgoff_t start_idx = (*pos - folio_start) >> PAGE_SHIFT; + pgoff_t end_idx = (*pos - folio_start + len - 1) >> PAGE_SHIFT; + int err = 0; + + for (pgoff_t i = start_idx; i <= end_idx && !err; i++) { + struct dnode_of_data dn; + struct node_info ni; + pgoff_t data_idx = folio->index + i; + bool ipu_force = false; + bool dn_held = false; + bool submitted_blk = false; + struct f2fs_io_info fio = { + .sbi = sbi, + .ino = inode->i_ino, + .type = DATA, + .op = REQ_OP_WRITE, + .op_flags = wbc_to_write_flags(wbc), + .old_blkaddr = NULL_ADDR, + .folio = folio, + .folio_offset = i, + .folio_blkcnt = 1, + .encrypted_page = NULL, + .submitted = 0, + .need_lock = LOCK_DONE, + .meta_gc = f2fs_meta_inode_gc_required(inode) ? 1 : 0, + .io_type = io_type, + .io_wbc = wbc, + }; + + if (f2fs_folio_has_ffs(folio)) { + ffs = (struct f2fs_folio_state *)folio->private; + atomic_inc(&ffs->write_pages_pending); + } + + set_new_dnode(&dn, dn_inode, NULL, NULL, 0); + + if (need_inplace_update(&fio) && + f2fs_lookup_read_extent_cache_block(inode, data_idx, + &fio.old_blkaddr)) { + if (!f2fs_is_valid_blkaddr(sbi, fio.old_blkaddr, + DATA_GENERIC_ENHANCE)) { + err = -EFSCORRUPTED; + goto block_done; + } + ipu_force = true; + goto got_it; + } + + err = f2fs_get_dnode_of_data(&dn, data_idx, LOOKUP_NODE); + if (err) + goto block_done; + dn_held = true; + + fio.old_blkaddr = dn.data_blkaddr; + +got_it: + if (__is_valid_data_blkaddr(fio.old_blkaddr) && + !f2fs_is_valid_blkaddr(sbi, fio.old_blkaddr, + DATA_GENERIC_ENHANCE)) { + err = -EFSCORRUPTED; + goto block_done; + } + + if (fio.meta_gc) + f2fs_wait_on_block_writeback(inode, fio.old_blkaddr); + + if (ipu_force || + (__is_valid_data_blkaddr(fio.old_blkaddr) && + need_inplace_update(&fio))) { + f2fs_put_dnode(&dn); + dn_held = false; + err = f2fs_inplace_write_data(&fio); + trace_f2fs_do_write_data_page(folio, IPU); + if (err) + goto block_done; + + if (submitted) + (*submitted)++; + submitted_blk = true; + set_inode_flag(inode, FI_UPDATE_WRITE); + goto block_done; + } + + err = f2fs_get_node_info(sbi, dn.nid, &ni, false); + if (err) + goto block_done; + + fio.version = ni.version; + + f2fs_outplace_write_data(&dn, &fio); + /* + * The outplace write path failed to submit this block. + */ + if (!fio.submitted) { + err = -EIO; + goto block_done; + } + if (submitted) + (*submitted)++; + submitted_blk = true; + set_inode_flag(inode, FI_APPEND_WRITE); + trace_f2fs_do_write_data_page(folio, OPU); +block_done: + if (dn_held) + f2fs_put_dnode(&dn); + /* + * If this block was not submitted, roll back its + * write pages pending. + */ + if (!submitted_blk && ffs) + f2fs_ffs_put_write_pending(folio, 1); + if (!err) { + *pos = ((loff_t)data_idx + 1) << PAGE_SHIFT; + spin_lock(&F2FS_I(inode)->i_size_lock); + if (F2FS_I(inode)->last_disk_size < *pos) + F2FS_I(inode)->last_disk_size = *pos; + spin_unlock(&F2FS_I(inode)->i_size_lock); + } else { + file_set_keep_isize(inode); + } + } + + return err; +} + int f2fs_write_single_data_page(struct folio *folio, int *submitted, struct bio **bio, sector_t *last_block, @@ -3972,6 +4255,226 @@ static int f2fs_write_cache_pages(struct address_space *mapping, return ret; } +static int f2fs_write_cache_folios(struct address_space *mapping, + struct writeback_control *wbc, + enum iostat_type io_type) +{ + struct folio *folio = NULL; + struct inode *inode = mapping->host; + struct f2fs_sb_info *sbi = F2FS_I_SB(inode); + struct f2fs_lock_context lc; + u64 pos = 0; + u64 end_pos = 0; + u32 r_len = 0; + int err = 0; + int submitted = 0; + int nwritten = 0; + bool op_locked = false; + bool retry = false; + + if (get_dirty_pages(inode) <= SM_I(sbi)->min_hot_blocks) + set_inode_flag(inode, FI_HOT_DATA); + else + clear_inode_flag(inode, FI_HOT_DATA); + + while ((folio = writeback_iter(mapping, wbc, folio, &err))) { + struct f2fs_folio_state *ffs = NULL; + u64 isize; + size_t poff; + pgoff_t end_index; + bool verity_in_progress; + int folio_submitted = 0; + bool bias_added = false; + + submitted = 0; + retry = false; + + if (err) { + folio_redirty_for_writepage(wbc, folio); + goto retry_out; + } + + if (atomic_read(&sbi->wb_sync_req[DATA]) && + wbc->sync_mode == WB_SYNC_NONE) { + folio_redirty_for_writepage(wbc, folio); + /* + * A WB_SYNC_ALL writeback is in progress, so defer + * this writeback. Mark the error as -EBUSY to let + * writeback_iter() stop iterating. + */ + err = -EBUSY; + goto retry_out; + } + + /* + * If cp_error is set, all subpages of this folio are not written + * back unless the filesystem is mounted with errors=remount-ro. + */ + if (unlikely(f2fs_cp_error(sbi))) { + mapping_set_error(folio->mapping, -EIO); + if (F2FS_OPTION(sbi).errors == MOUNT_ERRORS_READONLY) { + folio_redirty_for_writepage(wbc, folio); + } else { + if (f2fs_folio_has_ffs(folio)) + f2fs_ffs_clear_subrange_dirty_and_test(folio, 0, + folio_size(folio)); + inode_dec_dirty_pages(inode); + } + goto retry_out; + } + + /* + * Writing back one large folio performs multiple block allocations, so + * best-effort balance the filesystem before writing it back. + */ + if (!F2FS_I(inode)->wb_task && has_not_enough_free_secs(sbi, 0, 0)) { + folio_redirty_for_writepage(wbc, folio); + retry = true; + folio_unlock(folio); + f2fs_balance_fs(sbi, true); + folio_lock(folio); + goto retry; + } +retry: + pos = folio_pos(folio); + end_pos = pos + folio_size(folio); + isize = i_size_read(inode); + verity_in_progress = f2fs_verity_in_progress(inode); + poff = 0; + end_index = 0; + + if (retry) { + + if (unlikely(folio->mapping != mapping)) + goto retry_out; + + if (!folio_test_dirty(folio)) + goto retry_out; + + if (folio_test_writeback(folio)) { + if (wbc->sync_mode == WB_SYNC_NONE) + goto retry_out; + f2fs_folio_wait_writeback(folio, true, true); + } + + if (!folio_clear_dirty_for_io(folio)) + goto retry_out; + } + + /* To avoid dealing with the complexity for one subrange is in bio + * while we trylock_op failed before writing another subrange. + * Try to lock_op before any subrange write for the folio. + */ + if (!op_locked) { + if (!f2fs_trylock_op(sbi, &lc)) { + folio_redirty_for_writepage(wbc, folio); + err = 0; + if (wbc->sync_mode != WB_SYNC_ALL) + goto retry_out; + + retry = true; + folio_unlock(folio); + f2fs_io_schedule_timeout(DEFAULT_SCHEDULE_TIMEOUT); + folio_lock(folio); + goto retry; + } + op_locked = true; + } + + if (!verity_in_progress) { + poff = offset_in_folio(folio, isize); + end_index = isize >> PAGE_SHIFT; + + if (folio->index > end_index || + (folio->index == end_index && poff == 0)) + goto out; + + if (end_pos > isize) { + folio_zero_segment(folio, poff, folio_size(folio)); + end_pos = isize; + } + } + + folio_start_writeback(folio); + + /* + * Large folios can be submitted as multiple bios, which may + * complete while we are still submitting the remaining dirty + * ranges. Hold a bias on write_pages_pending to prevent + * folio_end_writeback() from being called early. + */ + if (!bias_added && f2fs_folio_has_ffs(folio)) { + ffs = (struct f2fs_folio_state *)folio->private; + WARN_ON_ONCE(atomic_read(&ffs->write_pages_pending) != 0); + atomic_inc(&ffs->write_pages_pending); + bias_added = true; + } + + while ((r_len = ffs_find_dirty_range(folio, &pos, end_pos))) { + err = f2fs_write_folio_dirty_range(folio, &submitted, + wbc, io_type, &pos, r_len); + folio_submitted += submitted; + nwritten += submitted; + if (err) + goto out; + } + + /* If none of the subpages of a folio is submitted, keep the atomic flag */ + if (folio_submitted && + f2fs_is_atomic_file(inode) && + folio_test_f2fs_atomic(folio)) + folio_clear_f2fs_atomic(folio); + +out: + /* + * Clear the dirty state of the subranges that were written back. + * If some subranges are still dirty (e.g. the folio was only + * partially written back), or if the writeback failed, the + * folio must stay dirty so that the remaining subranges are + * written back later. + */ + if (f2fs_ffs_clear_subrange_dirty_and_test(folio, 0, + (err ? pos : end_pos) - folio_pos(folio)) || err) + folio_redirty_for_writepage(wbc, folio); + else + inode_dec_dirty_pages(inode); + + /* + * Release the bias taken above and we end writeback here if + * no write bio is in flight. + */ + if (bias_added) { + f2fs_ffs_put_write_pending(folio, 1); + } else if (!folio_submitted && folio_test_writeback(folio)) { + /* + * Order-0 folios take no bias, so end the writeback + * if nothing was submitted. + */ + folio_end_writeback(folio); + } + +retry_out: + if (op_locked) { + f2fs_unlock_op(sbi, &lc); + op_locked = false; + } + + folio_unlock(folio); + } + + if (nwritten) + f2fs_submit_merged_write_cond(F2FS_M_SB(mapping), mapping->host, + NULL); + + /* + * Prevent the -EBUSY error that stopped writeback_iter() from + * propagating to the user. + */ + if (err == -EBUSY) + err = 0; + return err; +} + static inline bool __should_serialize_io(struct inode *inode, struct writeback_control *wbc) { @@ -4066,7 +4569,11 @@ static int __f2fs_write_data_pages(struct address_space *mapping, account_writeback(inode, true); blk_start_plug(&plug); - ret = f2fs_write_cache_pages(mapping, wbc, io_type); + if (mapping_large_folio_support(inode->i_mapping) && + !f2fs_has_inline_data(inode)) + ret = f2fs_write_cache_folios(mapping, wbc, io_type); + else + ret = f2fs_write_cache_pages(mapping, wbc, io_type); blk_finish_plug(&plug); account_writeback(inode, false); diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c index 80f58c586e33..cbb65e0343c8 100644 --- a/fs/f2fs/segment.c +++ b/fs/f2fs/segment.c @@ -4173,7 +4173,13 @@ static void do_write_block(struct f2fs_summary *sum, struct f2fs_io_info *fio) "%s Failed to allocate data block, ino:%u, index:%lu, type:%d, old_blkaddr:0x%x, new_blkaddr:0x%x, err:%d", __func__, fio->ino, folio->index, type, fio->old_blkaddr, fio->new_blkaddr, err); - folio_end_writeback(folio); + /* + * For a large folio, the caller rolls back + * write_pages_pending and ends writeback when the last + * pending write is gone. + */ + if (!f2fs_folio_has_ffs(folio)) + folio_end_writeback(folio); } f2fs_bug_on(fio->sbi, !is_set_ckpt_flags(fio->sbi, CP_ERROR_FLAG)); -- 2.43.0