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Tue, 13 Oct 2026 04:56:53 -0700 (PDT) From: Nanzhe Zhao To: linux-f2fs-devel@lists.sourceforge.net, Jaegeuk Kim , Chao Yu Cc: Barry Song , Nanzhe Zhao , Juan Yescas , Daeho Jeong , Dev Jain , David Hildenbrand , linux-kernel@vger.kernel.org, Bo Zhang , Kalesh Singh , Nanzhe Zhao , Pengfei Li , Ryan Roberts Subject: [PATCH v4 05/18] f2fs: support regular file buffered writes on large folios Date: Tue, 13 Oct 2026 19:56:08 +0800 Message-ID: <20261013115621.968742-6-nzzhao.sigma@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20261013115621.968742-1-nzzhao.sigma@gmail.com> References: <20261013115621.968742-1-nzzhao.sigma@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Nanzhe Zhao To avoid the complexity of unlocking a large folio in write_begin, preallocate partial blocks for inodes that can use large folios. During write_begin, read only the partial head and tail 4K subpages that need read-before-write, and skip read I/O for the full middle subpages covered by the write. Signed-off-by: Nanzhe Zhao --- fs/f2fs/data.c | 375 +++++++++++++++++++++++++++++++++++++++++++++++-- fs/f2fs/f2fs.h | 1 + fs/f2fs/file.c | 17 ++- 3 files changed, 376 insertions(+), 17 deletions(-) diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c index cc92f05be..f2b89181f 100644 --- a/fs/f2fs/data.c +++ b/fs/f2fs/data.c @@ -93,6 +93,20 @@ struct bio_post_read_ctx { block_t fs_blkaddr; }; +static bool __ffs_mark_subrange_uptodate(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_set(ffs->state, start, end - start); + return bitmap_full(ffs->state, nr_subpages); +} + /* * Update and unlock a bio's pages, and free the bio. * @@ -107,6 +121,23 @@ struct bio_post_read_ctx { * called (i.e., I/O error or decryption error, but *not* verity error), and * release the bio's reference to the decompress_io_ctx of the page's cluster. */ +/* + * Update read_pages_pending. + */ +static inline void f2fs_update_read_folio_pending(struct folio *folio, int nr) +{ + struct f2fs_folio_state *ffs; + unsigned long flags; + + if (!f2fs_folio_has_ffs(folio)) + return; + + ffs = (struct f2fs_folio_state *)folio->private; + spin_lock_irqsave(&ffs->state_lock, flags); + ffs->read_pages_pending += nr; + spin_unlock_irqrestore(&ffs->state_lock, flags); +} + static void f2fs_finish_read_bio(struct bio *bio, bool in_task) { struct folio_iter fi; @@ -128,7 +159,8 @@ static void f2fs_finish_read_bio(struct bio *bio, bool in_task) } if (folio_test_large(folio)) { - struct f2fs_folio_state *ffs = folio->private; + struct f2fs_folio_state *ffs = + (struct f2fs_folio_state *)folio->private; spin_lock_irqsave(&ffs->state_lock, flags); ffs->read_pages_pending -= nr_pages; @@ -1430,6 +1462,36 @@ static void f2fs_submit_page_read(struct inode *inode, struct fsverity_info *vi, f2fs_submit_read_bio(sbi, bio, DATA); } +/* + * Synchronously read a single 4K subpage by reusing f2fs_submit_page_read() + * so that iostat, trace, blk-crypto and post-read handling are all preserved. + * The caller must have already allocated ffs for the folio. + */ +static int f2fs_submit_page_read_sync(struct inode *inode, struct folio *folio, + pgoff_t index, block_t blkaddr) +{ + struct f2fs_folio_state *ffs = + (struct f2fs_folio_state *)folio->private; + + /* Add bias so end_io does not call folio_end_read(). */ + f2fs_update_read_folio_pending(folio, 1); + + f2fs_submit_page_read(inode, NULL, folio, index, blkaddr, + REQ_OP_READ, false); + + /* Wait until all bios have completed (pending drops back to our bias). */ + while (READ_ONCE(ffs->read_pages_pending) != 1) + f2fs_io_schedule_timeout(DEFAULT_SCHEDULE_TIMEOUT); + + /* Remove the bias. */ + f2fs_update_read_folio_pending(folio, -1); + + if (!f2fs_ffs_test_blk_uptodate(folio, index)) + return -EIO; + + return 0; +} + static void __set_data_blkaddr(struct dnode_of_data *dn, block_t blkaddr) { __le32 *addr = get_dnode_addr(dn->inode, dn->node_entry); @@ -2766,6 +2828,110 @@ static void ffs_detach_free(struct folio *folio) kfree(ffs); } +bool f2fs_ffs_test_blk_uptodate(const struct folio *folio, pgoff_t index) +{ + struct f2fs_folio_state *ffs; + unsigned int idx; + + f2fs_bug_on(F2FS_F_SB(folio), !folio_contains(folio, index)); + + if (folio_test_uptodate(folio)) + return true; + + if (!f2fs_folio_has_ffs(folio)) + return false; + + ffs = (struct f2fs_folio_state *)folio->private; + idx = index - folio->index; + return test_bit(idx, ffs->state); +} + +static void f2fs_ffs_mark_subrange_uptodate(struct folio *folio, size_t offset, + size_t len) +{ + struct f2fs_folio_state *ffs; + unsigned long flags; + bool mark_uptodate = false; + + f2fs_bug_on(F2FS_F_SB(folio), offset + len > folio_size(folio)); + + if (!f2fs_folio_has_ffs(folio)) { + folio_mark_uptodate(folio); + return; + } + + ffs = (struct f2fs_folio_state *)folio->private; + spin_lock_irqsave(&ffs->state_lock, flags); + mark_uptodate = __ffs_mark_subrange_uptodate(folio, ffs, offset, len) && + !ffs->read_pages_pending; + spin_unlock_irqrestore(&ffs->state_lock, flags); + if (mark_uptodate) + folio_mark_uptodate(folio); +} + +static unsigned int __ffs_mark_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, before; + + start = offset >> PAGE_SHIFT; + end = (offset + len + PAGE_SIZE - 1) >> PAGE_SHIFT; + end = min(end, nr_subpages); + + before = bitmap_weight(ffs->state, 2 * nr_subpages); + bitmap_set(ffs->state, nr_subpages + start, end - start); + return bitmap_weight(ffs->state, 2 * nr_subpages) - before; +} + +static void f2fs_ffs_mark_subrange_dirty(struct folio *folio, + size_t offset, size_t len) +{ + struct f2fs_folio_state *ffs; + unsigned long flags; + + f2fs_bug_on(F2FS_F_SB(folio), offset + len > folio_size(folio)); + + if (!f2fs_folio_has_ffs(folio)) + return; + + ffs = (struct f2fs_folio_state *)folio->private; + + spin_lock_irqsave(&ffs->state_lock, flags); + __ffs_mark_subrange_dirty(folio, ffs, offset, len); + spin_unlock_irqrestore(&ffs->state_lock, flags); +} + +static bool find_next_valid_block(const struct folio *folio, + size_t orig_off, size_t *need_off, + size_t len) +{ + size_t start = orig_off; + size_t end = start + len; + size_t head, tail; + pgoff_t index; + + if (start & (PAGE_SIZE - 1)) { + head = round_down(start, PAGE_SIZE); + index = folio->index + (head >> PAGE_SHIFT); + if (!f2fs_ffs_test_blk_uptodate(folio, index)) { + *need_off = head; + return true; + } + } + + if (end & (PAGE_SIZE - 1)) { + tail = round_down(end, PAGE_SIZE); + index = folio->index + (tail >> PAGE_SHIFT); + if (!f2fs_ffs_test_blk_uptodate(folio, index)) { + *need_off = tail; + return true; + } + } + + return false; +} + static int f2fs_read_data_large_folio(struct inode *inode, struct fsverity_info *vi, struct readahead_control *rac, struct folio *folio) @@ -4127,6 +4293,141 @@ static int prepare_atomic_write_begin(struct f2fs_sb_info *sbi, return 0; } +/* + * Drop the folio lock when a node was changed, then balance the + * filesystem and reacquire the lock. + * + * Return: true if the folio became unusable while unlocked (being + * truncated), false if the folio is still usable. + */ +static bool f2fs_balance_fs_folio_locked(struct folio *folio, + struct address_space *mapping, bool node_changed) +{ + struct inode *inode = folio->mapping->host; + struct f2fs_sb_info *sbi = F2FS_I_SB(inode); + unsigned int orig_order; + + if (!node_changed || IS_NOQUOTA(inode) || + !has_not_enough_free_secs(sbi, 0, 0)) + return false; + + orig_order = folio_order(folio); + folio_unlock(folio); + f2fs_balance_fs(sbi, true); + folio_lock(folio); + + /* + * Writeback may have started on the folio during the unlock + * window, so wait for it before the caller proceeds. + */ + f2fs_folio_wait_writeback(folio, true, true); + + if (folio->mapping != mapping) + return true; + + if (folio_order(folio) != orig_order) + return true; + + return false; +} + +static int prepare_large_folio_write_begin(struct inode *inode, + struct folio *folio, loff_t pos, + unsigned int len) +{ + struct f2fs_sb_info *sbi = F2FS_I_SB(inode); + struct f2fs_folio_state *ffs; + size_t ori_off = offset_in_folio(folio, pos); + size_t need_off = ori_off; + int err = 0; + + /* + * when the write did not come through f2fs_write_iter, we preallocate all + * blocks in the write range here. + */ + if (!is_inode_flag_set(inode, FI_PREALLOCATED_ALL) && + !IS_DEVICE_ALIASING(inode)) { + pgoff_t first = F2FS_BYTES_TO_BLK(sbi, pos); + pgoff_t last = F2FS_BLK_ALIGN(sbi, pos + len); + pgoff_t idx; + + for (idx = first; idx < last; idx++) { + block_t blkaddr = NULL_ADDR; + bool node_changed = false; + + err = __reserve_data_block(inode, idx, &blkaddr, + &node_changed); + if (err) + return err; + if (f2fs_balance_fs_folio_locked(folio, folio->mapping, + node_changed)) + return -EAGAIN; + } + } + + ffs = f2fs_ffs_find_or_alloc(folio); + if (!ffs) + return -ENOMEM; + + /* Skip read if the folio is already fully uptodate or the write + * covers the entire folio. + */ + if (folio_test_uptodate(folio) || len == folio_size(folio)) + return 0; + + if (!f2fs_verity_in_progress(inode) && + !(pos & (PAGE_SIZE - 1)) && (pos + len) >= i_size_read(inode)) { + size_t zoff = ori_off + len; + + if (zoff < folio_size(folio)) + folio_zero_segment(folio, zoff, folio_size(folio)); + return 0; + } + + /* Inline data must have been converted before reaching here. */ + f2fs_bug_on(sbi, f2fs_has_inline_data(inode)); + + while (find_next_valid_block(folio, ori_off, + &need_off, len)) { + struct dnode_of_data dn; + pgoff_t index = folio->index + (need_off >> PAGE_SHIFT); + block_t blkaddr; + + if (!f2fs_lookup_read_extent_cache_block(inode, index, + &blkaddr)) { + if (IS_DEVICE_ALIASING(inode)) + return -ENODATA; + + set_new_dnode(&dn, inode, NULL, NULL, 0); + err = f2fs_get_dnode_of_data(&dn, index, LOOKUP_NODE); + if (err) + return err; + blkaddr = dn.data_blkaddr; + f2fs_put_dnode(&dn); + + if (blkaddr == NEW_ADDR) { + size_t off = offset_in_folio(folio, + (loff_t)index << PAGE_SHIFT); + + folio_zero_segment(folio, off, off + PAGE_SIZE); + f2fs_ffs_mark_subrange_uptodate(folio, off, + PAGE_SIZE); + continue; + } + + if (!f2fs_is_valid_blkaddr(sbi, blkaddr, + DATA_GENERIC_ENHANCE_READ)) + return -EFSCORRUPTED; + } + + err = f2fs_submit_page_read_sync(inode, folio, index, blkaddr); + if (err) + return err; + } + + return 0; +} + static int f2fs_write_begin(const struct kiocb *iocb, struct address_space *mapping, loff_t pos, unsigned len, struct folio **foliop, @@ -4138,6 +4439,8 @@ static int f2fs_write_begin(const struct kiocb *iocb, pgoff_t index = pos >> PAGE_SHIFT; bool need_balance = false; block_t blkaddr = NULL_ADDR; + fgf_t fgp = FGP_LOCK | FGP_WRITE | FGP_CREAT; + unsigned int blen; int err = 0; trace_f2fs_write_begin(inode, pos, len); @@ -4185,9 +4488,15 @@ static int f2fs_write_begin(const struct kiocb *iocb, * Do not use FGP_STABLE to avoid deadlock. * Will wait that below with our IO control. */ - folio = f2fs_filemap_get_folio(mapping, index, - FGP_LOCK | FGP_WRITE | FGP_CREAT, - mapping_gfp_mask(mapping)); + /* + * Inline data is carried in the first subpage. Keep the index #0 + * folio order-0 so that the existing inline read/convert paths + * (prepare_write_begin()) still apply; large folios are used from + * the second folio on. + */ + fgp |= fgf_set_order(f2fs_has_inline_data(inode) ? PAGE_SIZE : len); + folio = f2fs_filemap_get_folio(mapping, index, fgp, + mapping_gfp_mask(mapping)); if (IS_ERR(folio)) { err = PTR_ERR(folio); goto fail; @@ -4197,11 +4506,15 @@ static int f2fs_write_begin(const struct kiocb *iocb, *foliop = folio; + /* Clamp the write length to the folio size. */ + blen = min_t(unsigned int, len, + folio_size(folio) - offset_in_folio(folio, pos)); + if (f2fs_is_atomic_file(inode)) err = prepare_atomic_write_begin(sbi, folio, pos, len, &blkaddr, &need_balance); - else - err = prepare_write_begin(sbi, folio, pos, len, + else if (!folio_test_large(folio)) + err = prepare_write_begin(sbi, folio, pos, blen, &blkaddr, &need_balance); if (err) goto put_folio; @@ -4221,7 +4534,19 @@ static int f2fs_write_begin(const struct kiocb *iocb, f2fs_folio_wait_writeback(folio, false, true); - if (len == folio_size(folio) || folio_test_uptodate(folio)) + if (folio_test_large(folio)) { + err = prepare_large_folio_write_begin(inode, + folio, pos, blen); + if (!err) + return 0; + if (err == -EAGAIN) { + f2fs_folio_put(folio, true); + goto repeat; + } + goto put_folio; + } + + if (blen == folio_size(folio) || folio_test_uptodate(folio)) return 0; if (!(pos & (PAGE_SIZE - 1)) && (pos + len) >= i_size_read(inode) && @@ -4281,15 +4606,20 @@ static int f2fs_write_end(const struct kiocb *iocb, trace_f2fs_write_end(inode, pos, len, copied); /* - * This should be come from len == PAGE_SIZE, and we expect copied - * should be PAGE_SIZE. Otherwise, we treat it with zero copied and - * let generic_perform_write() try to copy data again through copied=0. + * If a short copy happens on a folio that isn't uptodate, we treat + * it with zero copied and let generic_perform_write() try to copy + * data again through copied=0. */ if (!folio_test_uptodate(folio)) { - if (unlikely(copied != len)) + if (unlikely(copied != len)) { copied = 0; - else + } else if (folio_test_large(folio)) { + f2fs_ffs_mark_subrange_uptodate(folio, + offset_in_folio(folio, pos), len); + } else { + /* This should be come from len == PAGE_SIZE */ folio_mark_uptodate(folio); + } } #ifdef CONFIG_F2FS_FS_COMPRESSION @@ -4308,6 +4638,9 @@ static int f2fs_write_end(const struct kiocb *iocb, if (!copied) goto unlock_out; + if (folio_test_large(folio)) + f2fs_ffs_mark_subrange_dirty(folio, offset_in_folio(folio, pos), + copied); folio_mark_dirty(folio); if (f2fs_is_atomic_file(inode)) @@ -4364,8 +4697,22 @@ static bool f2fs_dirty_data_folio(struct address_space *mapping, trace_f2fs_set_page_dirty(folio, DATA); - if (!folio_test_uptodate(folio)) - folio_mark_uptodate(folio); + if (!folio_test_uptodate(folio)) { + bool uptodate = true; + + if (f2fs_folio_has_ffs(folio)) { + struct f2fs_folio_state *ffs = + (struct f2fs_folio_state *)folio->private; + unsigned long flags; + + spin_lock_irqsave(&ffs->state_lock, flags); + uptodate = bitmap_full(ffs->state, folio_nr_pages(folio)) && + !ffs->read_pages_pending; + spin_unlock_irqrestore(&ffs->state_lock, flags); + } + if (uptodate) + folio_mark_uptodate(folio); + } BUG_ON(folio_test_swapcache(folio)); if (filemap_dirty_folio(mapping, folio)) { diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h index d0a9b3f99..f1a37e4fd 100644 --- a/fs/f2fs/f2fs.h +++ b/fs/f2fs/f2fs.h @@ -4429,6 +4429,7 @@ int f2fs_write_single_data_page(struct folio *folio, int *submitted, struct writeback_control *wbc, enum iostat_type io_type, int compr_blocks, bool allow_balance); +bool f2fs_ffs_test_blk_uptodate(const struct folio *folio, pgoff_t index); void f2fs_write_failed(struct inode *inode, loff_t to); void f2fs_invalidate_folio(struct folio *folio, size_t offset, size_t length); bool f2fs_release_folio(struct folio *folio, gfp_t wait); diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c index d680f6f8a..f7ed20f0c 100644 --- a/fs/f2fs/file.c +++ b/fs/f2fs/file.c @@ -5405,9 +5405,20 @@ static int f2fs_preallocate_blocks(struct kiocb *iocb, struct iov_iter *iter, return ret; } - /* Do not preallocate blocks that will be written partially in 4KB. */ - map.m_lblk = F2FS_BLK_ALIGN(sbi, pos); - map.m_len = F2FS_BYTES_TO_BLK(sbi, pos + count); + if (!dio && mapping_large_folio_support(inode->i_mapping)) { + /* + * Preallocate all blocks touched by a large-folio buffered write so + * the regular write_begin path does not need to unlock the folio for + * f2fs_balance_fs(). Rechecking large-folio state after unlock is + * unreliable since partial truncation can split the folio. + */ + map.m_lblk = F2FS_BYTES_TO_BLK(sbi, pos); + map.m_len = F2FS_BLK_ALIGN(sbi, pos + count); + } else { + /* Do not preallocate blocks that will be written partially in 4KB. */ + map.m_lblk = F2FS_BLK_ALIGN(sbi, pos); + map.m_len = F2FS_BYTES_TO_BLK(sbi, pos + count); + } if (map.m_len > map.m_lblk) map.m_len -= map.m_lblk; else -- 2.43.0