Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 4235 insertions, 0 deletions

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
new file mode 100644
index 000000000..8b561af37
--- /dev/null
+++ b/fs/f2fs/data.c
@@ -0,0 +1,4235 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * fs/f2fs/data.c
+ *
+ * Copyright (c) 2012 Samsung Electronics Co., Ltd.
+ *             http://www.samsung.com/
+ */
+#include <linux/fs.h>
+#include <linux/f2fs_fs.h>
+#include <linux/buffer_head.h>
+#include <linux/sched/mm.h>
+#include <linux/mpage.h>
+#include <linux/writeback.h>
+#include <linux/pagevec.h>
+#include <linux/blkdev.h>
+#include <linux/bio.h>
+#include <linux/blk-crypto.h>
+#include <linux/swap.h>
+#include <linux/prefetch.h>
+#include <linux/uio.h>
+#include <linux/sched/signal.h>
+#include <linux/fiemap.h>
+#include <linux/iomap.h>
+
+#include "f2fs.h"
+#include "node.h"
+#include "segment.h"
+#include "iostat.h"
+#include <trace/events/f2fs.h>
+
+#define NUM_PREALLOC_POST_READ_CTXS	128
+
+static struct kmem_cache *bio_post_read_ctx_cache;
+static struct kmem_cache *bio_entry_slab;
+static mempool_t *bio_post_read_ctx_pool;
+static struct bio_set f2fs_bioset;
+
+#define	F2FS_BIO_POOL_SIZE	NR_CURSEG_TYPE
+
+int __init f2fs_init_bioset(void)
+{
+	if (bioset_init(&f2fs_bioset, F2FS_BIO_POOL_SIZE,
+					0, BIOSET_NEED_BVECS))
+		return -ENOMEM;
+	return 0;
+}
+
+void f2fs_destroy_bioset(void)
+{
+	bioset_exit(&f2fs_bioset);
+}
+
+static bool __is_cp_guaranteed(struct page *page)
+{
+	struct address_space *mapping = page->mapping;
+	struct inode *inode;
+	struct f2fs_sb_info *sbi;
+
+	if (!mapping)
+		return false;
+
+	inode = mapping->host;
+	sbi = F2FS_I_SB(inode);
+
+	if (inode->i_ino == F2FS_META_INO(sbi) ||
+			inode->i_ino == F2FS_NODE_INO(sbi) ||
+			S_ISDIR(inode->i_mode))
+		return true;
+
+	if (f2fs_is_compressed_page(page))
+		return false;
+	if ((S_ISREG(inode->i_mode) && IS_NOQUOTA(inode)) ||
+			page_private_gcing(page))
+		return true;
+	return false;
+}
+
+static enum count_type __read_io_type(struct page *page)
+{
+	struct address_space *mapping = page_file_mapping(page);
+
+	if (mapping) {
+		struct inode *inode = mapping->host;
+		struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
+
+		if (inode->i_ino == F2FS_META_INO(sbi))
+			return F2FS_RD_META;
+
+		if (inode->i_ino == F2FS_NODE_INO(sbi))
+			return F2FS_RD_NODE;
+	}
+	return F2FS_RD_DATA;
+}
+
+/* postprocessing steps for read bios */
+enum bio_post_read_step {
+#ifdef CONFIG_FS_ENCRYPTION
+	STEP_DECRYPT	= BIT(0),
+#else
+	STEP_DECRYPT	= 0,	/* compile out the decryption-related code */
+#endif
+#ifdef CONFIG_F2FS_FS_COMPRESSION
+	STEP_DECOMPRESS	= BIT(1),
+#else
+	STEP_DECOMPRESS	= 0,	/* compile out the decompression-related code */
+#endif
+#ifdef CONFIG_FS_VERITY
+	STEP_VERITY	= BIT(2),
+#else
+	STEP_VERITY	= 0,	/* compile out the verity-related code */
+#endif
+};
+
+struct bio_post_read_ctx {
+	struct bio *bio;
+	struct f2fs_sb_info *sbi;
+	struct work_struct work;
+	unsigned int enabled_steps;
+	block_t fs_blkaddr;
+};
+
+static void f2fs_finish_read_bio(struct bio *bio, bool in_task)
+{
+	struct bio_vec *bv;
+	struct bvec_iter_all iter_all;
+
+	/*
+	 * Update and unlock the bio's pagecache pages, and put the
+	 * decompression context for any compressed pages.
+	 */
+	bio_for_each_segment_all(bv, bio, iter_all) {
+		struct page *page = bv->bv_page;
+
+		if (f2fs_is_compressed_page(page)) {
+			if (bio->bi_status)
+				f2fs_end_read_compressed_page(page, true, 0,
+							in_task);
+			f2fs_put_page_dic(page, in_task);
+			continue;
+		}
+
+		/* PG_error was set if verity failed. */
+		if (bio->bi_status || PageError(page)) {
+			ClearPageUptodate(page);
+			/* will re-read again later */
+			ClearPageError(page);
+		} else {
+			SetPageUptodate(page);
+		}
+		dec_page_count(F2FS_P_SB(page), __read_io_type(page));
+		unlock_page(page);
+	}
+
+	if (bio->bi_private)
+		mempool_free(bio->bi_private, bio_post_read_ctx_pool);
+	bio_put(bio);
+}
+
+static void f2fs_verify_bio(struct work_struct *work)
+{
+	struct bio_post_read_ctx *ctx =
+		container_of(work, struct bio_post_read_ctx, work);
+	struct bio *bio = ctx->bio;
+	bool may_have_compressed_pages = (ctx->enabled_steps & STEP_DECOMPRESS);
+
+	/*
+	 * fsverity_verify_bio() may call readahead() again, and while verity
+	 * will be disabled for this, decryption and/or decompression may still
+	 * be needed, resulting in another bio_post_read_ctx being allocated.
+	 * So to prevent deadlocks we need to release the current ctx to the
+	 * mempool first.  This assumes that verity is the last post-read step.
+	 */
+	mempool_free(ctx, bio_post_read_ctx_pool);
+	bio->bi_private = NULL;
+
+	/*
+	 * Verify the bio's pages with fs-verity.  Exclude compressed pages,
+	 * as those were handled separately by f2fs_end_read_compressed_page().
+	 */
+	if (may_have_compressed_pages) {
+		struct bio_vec *bv;
+		struct bvec_iter_all iter_all;
+
+		bio_for_each_segment_all(bv, bio, iter_all) {
+			struct page *page = bv->bv_page;
+
+			if (!f2fs_is_compressed_page(page) &&
+			    !fsverity_verify_page(page))
+				SetPageError(page);
+		}
+	} else {
+		fsverity_verify_bio(bio);
+	}
+
+	f2fs_finish_read_bio(bio, true);
+}
+
+/*
+ * If the bio's data needs to be verified with fs-verity, then enqueue the
+ * verity work for the bio.  Otherwise finish the bio now.
+ *
+ * Note that to avoid deadlocks, the verity work can't be done on the
+ * decryption/decompression workqueue.  This is because verifying the data pages
+ * can involve reading verity metadata pages from the file, and these verity
+ * metadata pages may be encrypted and/or compressed.
+ */
+static void f2fs_verify_and_finish_bio(struct bio *bio, bool in_task)
+{
+	struct bio_post_read_ctx *ctx = bio->bi_private;
+
+	if (ctx && (ctx->enabled_steps & STEP_VERITY)) {
+		INIT_WORK(&ctx->work, f2fs_verify_bio);
+		fsverity_enqueue_verify_work(&ctx->work);
+	} else {
+		f2fs_finish_read_bio(bio, in_task);
+	}
+}
+
+/*
+ * Handle STEP_DECOMPRESS by decompressing any compressed clusters whose last
+ * remaining page was read by @ctx->bio.
+ *
+ * Note that a bio may span clusters (even a mix of compressed and uncompressed
+ * clusters) or be for just part of a cluster.  STEP_DECOMPRESS just indicates
+ * that the bio includes at least one compressed page.  The actual decompression
+ * is done on a per-cluster basis, not a per-bio basis.
+ */
+static void f2fs_handle_step_decompress(struct bio_post_read_ctx *ctx,
+		bool in_task)
+{
+	struct bio_vec *bv;
+	struct bvec_iter_all iter_all;
+	bool all_compressed = true;
+	block_t blkaddr = ctx->fs_blkaddr;
+
+	bio_for_each_segment_all(bv, ctx->bio, iter_all) {
+		struct page *page = bv->bv_page;
+
+		if (f2fs_is_compressed_page(page))
+			f2fs_end_read_compressed_page(page, false, blkaddr,
+						      in_task);
+		else
+			all_compressed = false;
+
+		blkaddr++;
+	}
+
+	/*
+	 * Optimization: if all the bio's pages are compressed, then scheduling
+	 * the per-bio verity work is unnecessary, as verity will be fully
+	 * handled at the compression cluster level.
+	 */
+	if (all_compressed)
+		ctx->enabled_steps &= ~STEP_VERITY;
+}
+
+static void f2fs_post_read_work(struct work_struct *work)
+{
+	struct bio_post_read_ctx *ctx =
+		container_of(work, struct bio_post_read_ctx, work);
+	struct bio *bio = ctx->bio;
+
+	if ((ctx->enabled_steps & STEP_DECRYPT) && !fscrypt_decrypt_bio(bio)) {
+		f2fs_finish_read_bio(bio, true);
+		return;
+	}
+
+	if (ctx->enabled_steps & STEP_DECOMPRESS)
+		f2fs_handle_step_decompress(ctx, true);
+
+	f2fs_verify_and_finish_bio(bio, true);
+}
+
+static void f2fs_read_end_io(struct bio *bio)
+{
+	struct f2fs_sb_info *sbi = F2FS_P_SB(bio_first_page_all(bio));
+	struct bio_post_read_ctx *ctx;
+	bool intask = in_task();
+
+	iostat_update_and_unbind_ctx(bio, 0);
+	ctx = bio->bi_private;
+
+	if (time_to_inject(sbi, FAULT_READ_IO)) {
+		f2fs_show_injection_info(sbi, FAULT_READ_IO);
+		bio->bi_status = BLK_STS_IOERR;
+	}
+
+	if (bio->bi_status) {
+		f2fs_finish_read_bio(bio, intask);
+		return;
+	}
+
+	if (ctx) {
+		unsigned int enabled_steps = ctx->enabled_steps &
+					(STEP_DECRYPT | STEP_DECOMPRESS);
+
+		/*
+		 * If we have only decompression step between decompression and
+		 * decrypt, we don't need post processing for this.
+		 */
+		if (enabled_steps == STEP_DECOMPRESS &&
+				!f2fs_low_mem_mode(sbi)) {
+			f2fs_handle_step_decompress(ctx, intask);
+		} else if (enabled_steps) {
+			INIT_WORK(&ctx->work, f2fs_post_read_work);
+			queue_work(ctx->sbi->post_read_wq, &ctx->work);
+			return;
+		}
+	}
+
+	f2fs_verify_and_finish_bio(bio, intask);
+}
+
+static void f2fs_write_end_io(struct bio *bio)
+{
+	struct f2fs_sb_info *sbi;
+	struct bio_vec *bvec;
+	struct bvec_iter_all iter_all;
+
+	iostat_update_and_unbind_ctx(bio, 1);
+	sbi = bio->bi_private;
+
+	if (time_to_inject(sbi, FAULT_WRITE_IO)) {
+		f2fs_show_injection_info(sbi, FAULT_WRITE_IO);
+		bio->bi_status = BLK_STS_IOERR;
+	}
+
+	bio_for_each_segment_all(bvec, bio, iter_all) {
+		struct page *page = bvec->bv_page;
+		enum count_type type = WB_DATA_TYPE(page);
+
+		if (page_private_dummy(page)) {
+			clear_page_private_dummy(page);
+			unlock_page(page);
+			mempool_free(page, sbi->write_io_dummy);
+
+			if (unlikely(bio->bi_status))
+				f2fs_stop_checkpoint(sbi, true,
+						STOP_CP_REASON_WRITE_FAIL);
+			continue;
+		}
+
+		fscrypt_finalize_bounce_page(&page);
+
+#ifdef CONFIG_F2FS_FS_COMPRESSION
+		if (f2fs_is_compressed_page(page)) {
+			f2fs_compress_write_end_io(bio, page);
+			continue;
+		}
+#endif
+
+		if (unlikely(bio->bi_status)) {
+			mapping_set_error(page->mapping, -EIO);
+			if (type == F2FS_WB_CP_DATA)
+				f2fs_stop_checkpoint(sbi, true,
+						STOP_CP_REASON_WRITE_FAIL);
+		}
+
+		f2fs_bug_on(sbi, page->mapping == NODE_MAPPING(sbi) &&
+					page->index != nid_of_node(page));
+
+		dec_page_count(sbi, type);
+		if (f2fs_in_warm_node_list(sbi, page))
+			f2fs_del_fsync_node_entry(sbi, page);
+		clear_page_private_gcing(page);
+		end_page_writeback(page);
+	}
+	if (!get_pages(sbi, F2FS_WB_CP_DATA) &&
+				wq_has_sleeper(&sbi->cp_wait))
+		wake_up(&sbi->cp_wait);
+
+	bio_put(bio);
+}
+
+struct block_device *f2fs_target_device(struct f2fs_sb_info *sbi,
+		block_t blk_addr, sector_t *sector)
+{
+	struct block_device *bdev = sbi->sb->s_bdev;
+	int i;
+
+	if (f2fs_is_multi_device(sbi)) {
+		for (i = 0; i < sbi->s_ndevs; i++) {
+			if (FDEV(i).start_blk <= blk_addr &&
+			    FDEV(i).end_blk >= blk_addr) {
+				blk_addr -= FDEV(i).start_blk;
+				bdev = FDEV(i).bdev;
+				break;
+			}
+		}
+	}
+
+	if (sector)
+		*sector = SECTOR_FROM_BLOCK(blk_addr);
+	return bdev;
+}
+
+int f2fs_target_device_index(struct f2fs_sb_info *sbi, block_t blkaddr)
+{
+	int i;
+
+	if (!f2fs_is_multi_device(sbi))
+		return 0;
+
+	for (i = 0; i < sbi->s_ndevs; i++)
+		if (FDEV(i).start_blk <= blkaddr && FDEV(i).end_blk >= blkaddr)
+			return i;
+	return 0;
+}
+
+static blk_opf_t f2fs_io_flags(struct f2fs_io_info *fio)
+{
+	unsigned int temp_mask = GENMASK(NR_TEMP_TYPE - 1, 0);
+	unsigned int fua_flag, meta_flag, io_flag;
+	blk_opf_t op_flags = 0;
+
+	if (fio->op != REQ_OP_WRITE)
+		return 0;
+	if (fio->type == DATA)
+		io_flag = fio->sbi->data_io_flag;
+	else if (fio->type == NODE)
+		io_flag = fio->sbi->node_io_flag;
+	else
+		return 0;
+
+	fua_flag = io_flag & temp_mask;
+	meta_flag = (io_flag >> NR_TEMP_TYPE) & temp_mask;
+
+	/*
+	 * data/node io flag bits per temp:
+	 *      REQ_META     |      REQ_FUA      |
+	 *    5 |    4 |   3 |    2 |    1 |   0 |
+	 * Cold | Warm | Hot | Cold | Warm | Hot |
+	 */
+	if (BIT(fio->temp) & meta_flag)
+		op_flags |= REQ_META;
+	if (BIT(fio->temp) & fua_flag)
+		op_flags |= REQ_FUA;
+	return op_flags;
+}
+
+static struct bio *__bio_alloc(struct f2fs_io_info *fio, int npages)
+{
+	struct f2fs_sb_info *sbi = fio->sbi;
+	struct block_device *bdev;
+	sector_t sector;
+	struct bio *bio;
+
+	bdev = f2fs_target_device(sbi, fio->new_blkaddr, &sector);
+	bio = bio_alloc_bioset(bdev, npages,
+				fio->op | fio->op_flags | f2fs_io_flags(fio),
+				GFP_NOIO, &f2fs_bioset);
+	bio->bi_iter.bi_sector = sector;
+	if (is_read_io(fio->op)) {
+		bio->bi_end_io = f2fs_read_end_io;
+		bio->bi_private = NULL;
+	} else {
+		bio->bi_end_io = f2fs_write_end_io;
+		bio->bi_private = sbi;
+	}
+	iostat_alloc_and_bind_ctx(sbi, bio, NULL);
+
+	if (fio->io_wbc)
+		wbc_init_bio(fio->io_wbc, bio);
+
+	return bio;
+}
+
+static void f2fs_set_bio_crypt_ctx(struct bio *bio, const struct inode *inode,
+				  pgoff_t first_idx,
+				  const struct f2fs_io_info *fio,
+				  gfp_t gfp_mask)
+{
+	/*
+	 * The f2fs garbage collector sets ->encrypted_page when it wants to
+	 * read/write raw data without encryption.
+	 */
+	if (!fio || !fio->encrypted_page)
+		fscrypt_set_bio_crypt_ctx(bio, inode, first_idx, gfp_mask);
+}
+
+static bool f2fs_crypt_mergeable_bio(struct bio *bio, const struct inode *inode,
+				     pgoff_t next_idx,
+				     const struct f2fs_io_info *fio)
+{
+	/*
+	 * The f2fs garbage collector sets ->encrypted_page when it wants to
+	 * read/write raw data without encryption.
+	 */
+	if (fio && fio->encrypted_page)
+		return !bio_has_crypt_ctx(bio);
+
+	return fscrypt_mergeable_bio(bio, inode, next_idx);
+}
+
+static inline void __submit_bio(struct f2fs_sb_info *sbi,
+				struct bio *bio, enum page_type type)
+{
+	if (!is_read_io(bio_op(bio))) {
+		unsigned int start;
+
+		if (type != DATA && type != NODE)
+			goto submit_io;
+
+		if (f2fs_lfs_mode(sbi) && current->plug)
+			blk_finish_plug(current->plug);
+
+		if (!F2FS_IO_ALIGNED(sbi))
+			goto submit_io;
+
+		start = bio->bi_iter.bi_size >> F2FS_BLKSIZE_BITS;
+		start %= F2FS_IO_SIZE(sbi);
+
+		if (start == 0)
+			goto submit_io;
+
+		/* fill dummy pages */
+		for (; start < F2FS_IO_SIZE(sbi); start++) {
+			struct page *page =
+				mempool_alloc(sbi->write_io_dummy,
+					      GFP_NOIO | __GFP_NOFAIL);
+			f2fs_bug_on(sbi, !page);
+
+			lock_page(page);
+
+			zero_user_segment(page, 0, PAGE_SIZE);
+			set_page_private_dummy(page);
+
+			if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE)
+				f2fs_bug_on(sbi, 1);
+		}
+		/*
+		 * In the NODE case, we lose next block address chain. So, we
+		 * need to do checkpoint in f2fs_sync_file.
+		 */
+		if (type == NODE)
+			set_sbi_flag(sbi, SBI_NEED_CP);
+	}
+submit_io:
+	if (is_read_io(bio_op(bio)))
+		trace_f2fs_submit_read_bio(sbi->sb, type, bio);
+	else
+		trace_f2fs_submit_write_bio(sbi->sb, type, bio);
+
+	iostat_update_submit_ctx(bio, type);
+	submit_bio(bio);
+}
+
+void f2fs_submit_bio(struct f2fs_sb_info *sbi,
+				struct bio *bio, enum page_type type)
+{
+	__submit_bio(sbi, bio, type);
+}
+
+static void __submit_merged_bio(struct f2fs_bio_info *io)
+{
+	struct f2fs_io_info *fio = &io->fio;
+
+	if (!io->bio)
+		return;
+
+	if (is_read_io(fio->op))
+		trace_f2fs_prepare_read_bio(io->sbi->sb, fio->type, io->bio);
+	else
+		trace_f2fs_prepare_write_bio(io->sbi->sb, fio->type, io->bio);
+
+	__submit_bio(io->sbi, io->bio, fio->type);
+	io->bio = NULL;
+}
+
+static bool __has_merged_page(struct bio *bio, struct inode *inode,
+						struct page *page, nid_t ino)
+{
+	struct bio_vec *bvec;
+	struct bvec_iter_all iter_all;
+
+	if (!bio)
+		return false;
+
+	if (!inode && !page && !ino)
+		return true;
+
+	bio_for_each_segment_all(bvec, bio, iter_all) {
+		struct page *target = bvec->bv_page;
+
+		if (fscrypt_is_bounce_page(target)) {
+			target = fscrypt_pagecache_page(target);
+			if (IS_ERR(target))
+				continue;
+		}
+		if (f2fs_is_compressed_page(target)) {
+			target = f2fs_compress_control_page(target);
+			if (IS_ERR(target))
+				continue;
+		}
+
+		if (inode && inode == target->mapping->host)
+			return true;
+		if (page && page == target)
+			return true;
+		if (ino && ino == ino_of_node(target))
+			return true;
+	}
+
+	return false;
+}
+
+int f2fs_init_write_merge_io(struct f2fs_sb_info *sbi)
+{
+	int i;
+
+	for (i = 0; i < NR_PAGE_TYPE; i++) {
+		int n = (i == META) ? 1 : NR_TEMP_TYPE;
+		int j;
+
+		sbi->write_io[i] = f2fs_kmalloc(sbi,
+				array_size(n, sizeof(struct f2fs_bio_info)),
+				GFP_KERNEL);
+		if (!sbi->write_io[i])
+			return -ENOMEM;
+
+		for (j = HOT; j < n; j++) {
+			init_f2fs_rwsem(&sbi->write_io[i][j].io_rwsem);
+			sbi->write_io[i][j].sbi = sbi;
+			sbi->write_io[i][j].bio = NULL;
+			spin_lock_init(&sbi->write_io[i][j].io_lock);
+			INIT_LIST_HEAD(&sbi->write_io[i][j].io_list);
+			INIT_LIST_HEAD(&sbi->write_io[i][j].bio_list);
+			init_f2fs_rwsem(&sbi->write_io[i][j].bio_list_lock);
+		}
+	}
+
+	return 0;
+}
+
+static void __f2fs_submit_merged_write(struct f2fs_sb_info *sbi,
+				enum page_type type, enum temp_type temp)
+{
+	enum page_type btype = PAGE_TYPE_OF_BIO(type);
+	struct f2fs_bio_info *io = sbi->write_io[btype] + temp;
+
+	f2fs_down_write(&io->io_rwsem);
+
+	if (!io->bio)
+		goto unlock_out;
+
+	/* change META to META_FLUSH in the checkpoint procedure */
+	if (type >= META_FLUSH) {
+		io->fio.type = META_FLUSH;
+		io->bio->bi_opf |= REQ_META | REQ_PRIO | REQ_SYNC;
+		if (!test_opt(sbi, NOBARRIER))
+			io->bio->bi_opf |= REQ_PREFLUSH | REQ_FUA;
+	}
+	__submit_merged_bio(io);
+unlock_out:
+	f2fs_up_write(&io->io_rwsem);
+}
+
+static void __submit_merged_write_cond(struct f2fs_sb_info *sbi,
+				struct inode *inode, struct page *page,
+				nid_t ino, enum page_type type, bool force)
+{
+	enum temp_type temp;
+	bool ret = true;
+
+	for (temp = HOT; temp < NR_TEMP_TYPE; temp++) {
+		if (!force)	{
+			enum page_type btype = PAGE_TYPE_OF_BIO(type);
+			struct f2fs_bio_info *io = sbi->write_io[btype] + temp;
+
+			f2fs_down_read(&io->io_rwsem);
+			ret = __has_merged_page(io->bio, inode, page, ino);
+			f2fs_up_read(&io->io_rwsem);
+		}
+		if (ret)
+			__f2fs_submit_merged_write(sbi, type, temp);
+
+		/* TODO: use HOT temp only for meta pages now. */
+		if (type >= META)
+			break;
+	}
+}
+
+void f2fs_submit_merged_write(struct f2fs_sb_info *sbi, enum page_type type)
+{
+	__submit_merged_write_cond(sbi, NULL, NULL, 0, type, true);
+}
+
+void f2fs_submit_merged_write_cond(struct f2fs_sb_info *sbi,
+				struct inode *inode, struct page *page,
+				nid_t ino, enum page_type type)
+{
+	__submit_merged_write_cond(sbi, inode, page, ino, type, false);
+}
+
+void f2fs_flush_merged_writes(struct f2fs_sb_info *sbi)
+{
+	f2fs_submit_merged_write(sbi, DATA);
+	f2fs_submit_merged_write(sbi, NODE);
+	f2fs_submit_merged_write(sbi, META);
+}
+
+/*
+ * Fill the locked page with data located in the block address.
+ * A caller needs to unlock the page on failure.
+ */
+int f2fs_submit_page_bio(struct f2fs_io_info *fio)
+{
+	struct bio *bio;
+	struct page *page = fio->encrypted_page ?
+			fio->encrypted_page : fio->page;
+
+	if (!f2fs_is_valid_blkaddr(fio->sbi, fio->new_blkaddr,
+			fio->is_por ? META_POR : (__is_meta_io(fio) ?
+			META_GENERIC : DATA_GENERIC_ENHANCE))) {
+		f2fs_handle_error(fio->sbi, ERROR_INVALID_BLKADDR);
+		return -EFSCORRUPTED;
+	}
+
+	trace_f2fs_submit_page_bio(page, fio);
+
+	/* Allocate a new bio */
+	bio = __bio_alloc(fio, 1);
+
+	f2fs_set_bio_crypt_ctx(bio, fio->page->mapping->host,
+			       fio->page->index, fio, GFP_NOIO);
+
+	if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE) {
+		bio_put(bio);
+		return -EFAULT;
+	}
+
+	if (fio->io_wbc && !is_read_io(fio->op))
+		wbc_account_cgroup_owner(fio->io_wbc, fio->page, PAGE_SIZE);
+
+	inc_page_count(fio->sbi, is_read_io(fio->op) ?
+			__read_io_type(page) : WB_DATA_TYPE(fio->page));
+
+	__submit_bio(fio->sbi, bio, fio->type);
+	return 0;
+}
+
+static bool page_is_mergeable(struct f2fs_sb_info *sbi, struct bio *bio,
+				block_t last_blkaddr, block_t cur_blkaddr)
+{
+	if (unlikely(sbi->max_io_bytes &&
+			bio->bi_iter.bi_size >= sbi->max_io_bytes))
+		return false;
+	if (last_blkaddr + 1 != cur_blkaddr)
+		return false;
+	return bio->bi_bdev == f2fs_target_device(sbi, cur_blkaddr, NULL);
+}
+
+static bool io_type_is_mergeable(struct f2fs_bio_info *io,
+						struct f2fs_io_info *fio)
+{
+	if (io->fio.op != fio->op)
+		return false;
+	return io->fio.op_flags == fio->op_flags;
+}
+
+static bool io_is_mergeable(struct f2fs_sb_info *sbi, struct bio *bio,
+					struct f2fs_bio_info *io,
+					struct f2fs_io_info *fio,
+					block_t last_blkaddr,
+					block_t cur_blkaddr)
+{
+	if (F2FS_IO_ALIGNED(sbi) && (fio->type == DATA || fio->type == NODE)) {
+		unsigned int filled_blocks =
+				F2FS_BYTES_TO_BLK(bio->bi_iter.bi_size);
+		unsigned int io_size = F2FS_IO_SIZE(sbi);
+		unsigned int left_vecs = bio->bi_max_vecs - bio->bi_vcnt;
+
+		/* IOs in bio is aligned and left space of vectors is not enough */
+		if (!(filled_blocks % io_size) && left_vecs < io_size)
+			return false;
+	}
+	if (!page_is_mergeable(sbi, bio, last_blkaddr, cur_blkaddr))
+		return false;
+	return io_type_is_mergeable(io, fio);
+}
+
+static void add_bio_entry(struct f2fs_sb_info *sbi, struct bio *bio,
+				struct page *page, enum temp_type temp)
+{
+	struct f2fs_bio_info *io = sbi->write_io[DATA] + temp;
+	struct bio_entry *be;
+
+	be = f2fs_kmem_cache_alloc(bio_entry_slab, GFP_NOFS, true, NULL);
+	be->bio = bio;
+	bio_get(bio);
+
+	if (bio_add_page(bio, page, PAGE_SIZE, 0) != PAGE_SIZE)
+		f2fs_bug_on(sbi, 1);
+
+	f2fs_down_write(&io->bio_list_lock);
+	list_add_tail(&be->list, &io->bio_list);
+	f2fs_up_write(&io->bio_list_lock);
+}
+
+static void del_bio_entry(struct bio_entry *be)
+{
+	list_del(&be->list);
+	kmem_cache_free(bio_entry_slab, be);
+}
+
+static int add_ipu_page(struct f2fs_io_info *fio, struct bio **bio,
+							struct page *page)
+{
+	struct f2fs_sb_info *sbi = fio->sbi;
+	enum temp_type temp;
+	bool found = false;
+	int ret = -EAGAIN;
+
+	for (temp = HOT; temp < NR_TEMP_TYPE && !found; temp++) {
+		struct f2fs_bio_info *io = sbi->write_io[DATA] + temp;
+		struct list_head *head = &io->bio_list;
+		struct bio_entry *be;
+
+		f2fs_down_write(&io->bio_list_lock);
+		list_for_each_entry(be, head, list) {
+			if (be->bio != *bio)
+				continue;
+
+			found = true;
+
+			f2fs_bug_on(sbi, !page_is_mergeable(sbi, *bio,
+							    *fio->last_block,
+							    fio->new_blkaddr));
+			if (f2fs_crypt_mergeable_bio(*bio,
+					fio->page->mapping->host,
+					fio->page->index, fio) &&
+			    bio_add_page(*bio, page, PAGE_SIZE, 0) ==
+					PAGE_SIZE) {
+				ret = 0;
+				break;
+			}
+
+			/* page can't be merged into bio; submit the bio */
+			del_bio_entry(be);
+			__submit_bio(sbi, *bio, DATA);
+			break;
+		}
+		f2fs_up_write(&io->bio_list_lock);
+	}
+
+	if (ret) {
+		bio_put(*bio);
+		*bio = NULL;
+	}
+
+	return ret;
+}
+
+void f2fs_submit_merged_ipu_write(struct f2fs_sb_info *sbi,
+					struct bio **bio, struct page *page)
+{
+	enum temp_type temp;
+	bool found = false;
+	struct bio *target = bio ? *bio : NULL;
+
+	f2fs_bug_on(sbi, !target && !page);
+
+	for (temp = HOT; temp < NR_TEMP_TYPE && !found; temp++) {
+		struct f2fs_bio_info *io = sbi->write_io[DATA] + temp;
+		struct list_head *head = &io->bio_list;
+		struct bio_entry *be;
+
+		if (list_empty(head))
+			continue;
+
+		f2fs_down_read(&io->bio_list_lock);
+		list_for_each_entry(be, head, list) {
+			if (target)
+				found = (target == be->bio);
+			else
+				found = __has_merged_page(be->bio, NULL,
+								page, 0);
+			if (found)
+				break;
+		}
+		f2fs_up_read(&io->bio_list_lock);
+
+		if (!found)
+			continue;
+
+		found = false;
+
+		f2fs_down_write(&io->bio_list_lock);
+		list_for_each_entry(be, head, list) {
+			if (target)
+				found = (target == be->bio);
+			else
+				found = __has_merged_page(be->bio, NULL,
+								page, 0);
+			if (found) {
+				target = be->bio;
+				del_bio_entry(be);
+				break;
+			}
+		}
+		f2fs_up_write(&io->bio_list_lock);
+	}
+
+	if (found)
+		__submit_bio(sbi, target, DATA);
+	if (bio && *bio) {
+		bio_put(*bio);
+		*bio = NULL;
+	}
+}
+
+int f2fs_merge_page_bio(struct f2fs_io_info *fio)
+{
+	struct bio *bio = *fio->bio;
+	struct page *page = fio->encrypted_page ?
+			fio->encrypted_page : fio->page;
+
+	if (!f2fs_is_valid_blkaddr(fio->sbi, fio->new_blkaddr,
+			__is_meta_io(fio) ? META_GENERIC : DATA_GENERIC)) {
+		f2fs_handle_error(fio->sbi, ERROR_INVALID_BLKADDR);
+		return -EFSCORRUPTED;
+	}
+
+	trace_f2fs_submit_page_bio(page, fio);
+
+	if (bio && !page_is_mergeable(fio->sbi, bio, *fio->last_block,
+						fio->new_blkaddr))
+		f2fs_submit_merged_ipu_write(fio->sbi, &bio, NULL);
+alloc_new:
+	if (!bio) {
+		bio = __bio_alloc(fio, BIO_MAX_VECS);
+		f2fs_set_bio_crypt_ctx(bio, fio->page->mapping->host,
+				       fio->page->index, fio, GFP_NOIO);
+
+		add_bio_entry(fio->sbi, bio, page, fio->temp);
+	} else {
+		if (add_ipu_page(fio, &bio, page))
+			goto alloc_new;
+	}
+
+	if (fio->io_wbc)
+		wbc_account_cgroup_owner(fio->io_wbc, fio->page, PAGE_SIZE);
+
+	inc_page_count(fio->sbi, WB_DATA_TYPE(page));
+
+	*fio->last_block = fio->new_blkaddr;
+	*fio->bio = bio;
+
+	return 0;
+}
+
+void f2fs_submit_page_write(struct f2fs_io_info *fio)
+{
+	struct f2fs_sb_info *sbi = fio->sbi;
+	enum page_type btype = PAGE_TYPE_OF_BIO(fio->type);
+	struct f2fs_bio_info *io = sbi->write_io[btype] + fio->temp;
+	struct page *bio_page;
+
+	f2fs_bug_on(sbi, is_read_io(fio->op));
+
+	f2fs_down_write(&io->io_rwsem);
+next:
+	if (fio->in_list) {
+		spin_lock(&io->io_lock);
+		if (list_empty(&io->io_list)) {
+			spin_unlock(&io->io_lock);
+			goto out;
+		}
+		fio = list_first_entry(&io->io_list,
+						struct f2fs_io_info, list);
+		list_del(&fio->list);
+		spin_unlock(&io->io_lock);
+	}
+
+	verify_fio_blkaddr(fio);
+
+	if (fio->encrypted_page)
+		bio_page = fio->encrypted_page;
+	else if (fio->compressed_page)
+		bio_page = fio->compressed_page;
+	else
+		bio_page = fio->page;
+
+	/* set submitted = true as a return value */
+	fio->submitted = true;
+
+	inc_page_count(sbi, WB_DATA_TYPE(bio_page));
+
+	if (io->bio &&
+	    (!io_is_mergeable(sbi, io->bio, io, fio, io->last_block_in_bio,
+			      fio->new_blkaddr) ||
+	     !f2fs_crypt_mergeable_bio(io->bio, fio->page->mapping->host,
+				       bio_page->index, fio)))
+		__submit_merged_bio(io);
+alloc_new:
+	if (io->bio == NULL) {
+		if (F2FS_IO_ALIGNED(sbi) &&
+				(fio->type == DATA || fio->type == NODE) &&
+				fio->new_blkaddr & F2FS_IO_SIZE_MASK(sbi)) {
+			dec_page_count(sbi, WB_DATA_TYPE(bio_page));
+			fio->retry = true;
+			goto skip;
+		}
+		io->bio = __bio_alloc(fio, BIO_MAX_VECS);
+		f2fs_set_bio_crypt_ctx(io->bio, fio->page->mapping->host,
+				       bio_page->index, fio, GFP_NOIO);
+		io->fio = *fio;
+	}
+
+	if (bio_add_page(io->bio, bio_page, PAGE_SIZE, 0) < PAGE_SIZE) {
+		__submit_merged_bio(io);
+		goto alloc_new;
+	}
+
+	if (fio->io_wbc)
+		wbc_account_cgroup_owner(fio->io_wbc, fio->page, PAGE_SIZE);
+
+	io->last_block_in_bio = fio->new_blkaddr;
+
+	trace_f2fs_submit_page_write(fio->page, fio);
+skip:
+	if (fio->in_list)
+		goto next;
+out:
+	if (is_sbi_flag_set(sbi, SBI_IS_SHUTDOWN) ||
+				!f2fs_is_checkpoint_ready(sbi))
+		__submit_merged_bio(io);
+	f2fs_up_write(&io->io_rwsem);
+}
+
+static struct bio *f2fs_grab_read_bio(struct inode *inode, block_t blkaddr,
+				      unsigned nr_pages, blk_opf_t op_flag,
+				      pgoff_t first_idx, bool for_write)
+{
+	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
+	struct bio *bio;
+	struct bio_post_read_ctx *ctx = NULL;
+	unsigned int post_read_steps = 0;
+	sector_t sector;
+	struct block_device *bdev = f2fs_target_device(sbi, blkaddr, &sector);
+
+	bio = bio_alloc_bioset(bdev, bio_max_segs(nr_pages),
+			       REQ_OP_READ | op_flag,
+			       for_write ? GFP_NOIO : GFP_KERNEL, &f2fs_bioset);
+	if (!bio)
+		return ERR_PTR(-ENOMEM);
+	bio->bi_iter.bi_sector = sector;
+	f2fs_set_bio_crypt_ctx(bio, inode, first_idx, NULL, GFP_NOFS);
+	bio->bi_end_io = f2fs_read_end_io;
+
+	if (fscrypt_inode_uses_fs_layer_crypto(inode))
+		post_read_steps |= STEP_DECRYPT;
+
+	if (f2fs_need_verity(inode, first_idx))
+		post_read_steps |= STEP_VERITY;
+
+	/*
+	 * STEP_DECOMPRESS is handled specially, since a compressed file might
+	 * contain both compressed and uncompressed clusters.  We'll allocate a
+	 * bio_post_read_ctx if the file is compressed, but the caller is
+	 * responsible for enabling STEP_DECOMPRESS if it's actually needed.
+	 */
+
+	if (post_read_steps || f2fs_compressed_file(inode)) {
+		/* Due to the mempool, this never fails. */
+		ctx = mempool_alloc(bio_post_read_ctx_pool, GFP_NOFS);
+		ctx->bio = bio;
+		ctx->sbi = sbi;
+		ctx->enabled_steps = post_read_steps;
+		ctx->fs_blkaddr = blkaddr;
+		bio->bi_private = ctx;
+	}
+	iostat_alloc_and_bind_ctx(sbi, bio, ctx);
+
+	return bio;
+}
+
+/* This can handle encryption stuffs */
+static int f2fs_submit_page_read(struct inode *inode, struct page *page,
+				 block_t blkaddr, blk_opf_t op_flags,
+				 bool for_write)
+{
+	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
+	struct bio *bio;
+
+	bio = f2fs_grab_read_bio(inode, blkaddr, 1, op_flags,
+					page->index, for_write);
+	if (IS_ERR(bio))
+		return PTR_ERR(bio);
+
+	/* wait for GCed page writeback via META_MAPPING */
+	f2fs_wait_on_block_writeback(inode, blkaddr);
+
+	if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE) {
+		bio_put(bio);
+		return -EFAULT;
+	}
+	ClearPageError(page);
+	inc_page_count(sbi, F2FS_RD_DATA);
+	f2fs_update_iostat(sbi, NULL, FS_DATA_READ_IO, F2FS_BLKSIZE);
+	__submit_bio(sbi, bio, DATA);
+	return 0;
+}
+
+static void __set_data_blkaddr(struct dnode_of_data *dn)
+{
+	struct f2fs_node *rn = F2FS_NODE(dn->node_page);
+	__le32 *addr_array;
+	int base = 0;
+
+	if (IS_INODE(dn->node_page) && f2fs_has_extra_attr(dn->inode))
+		base = get_extra_isize(dn->inode);
+
+	/* Get physical address of data block */
+	addr_array = blkaddr_in_node(rn);
+	addr_array[base + dn->ofs_in_node] = cpu_to_le32(dn->data_blkaddr);
+}
+
+/*
+ * Lock ordering for the change of data block address:
+ * ->data_page
+ *  ->node_page
+ *    update block addresses in the node page
+ */
+void f2fs_set_data_blkaddr(struct dnode_of_data *dn)
+{
+	f2fs_wait_on_page_writeback(dn->node_page, NODE, true, true);
+	__set_data_blkaddr(dn);
+	if (set_page_dirty(dn->node_page))
+		dn->node_changed = true;
+}
+
+void f2fs_update_data_blkaddr(struct dnode_of_data *dn, block_t blkaddr)
+{
+	dn->data_blkaddr = blkaddr;
+	f2fs_set_data_blkaddr(dn);
+	f2fs_update_read_extent_cache(dn);
+}
+
+/* dn->ofs_in_node will be returned with up-to-date last block pointer */
+int f2fs_reserve_new_blocks(struct dnode_of_data *dn, blkcnt_t count)
+{
+	struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode);
+	int err;
+
+	if (!count)
+		return 0;
+
+	if (unlikely(is_inode_flag_set(dn->inode, FI_NO_ALLOC)))
+		return -EPERM;
+	if (unlikely((err = inc_valid_block_count(sbi, dn->inode, &count))))
+		return err;
+
+	trace_f2fs_reserve_new_blocks(dn->inode, dn->nid,
+						dn->ofs_in_node, count);
+
+	f2fs_wait_on_page_writeback(dn->node_page, NODE, true, true);
+
+	for (; count > 0; dn->ofs_in_node++) {
+		block_t blkaddr = f2fs_data_blkaddr(dn);
+
+		if (blkaddr == NULL_ADDR) {
+			dn->data_blkaddr = NEW_ADDR;
+			__set_data_blkaddr(dn);
+			count--;
+		}
+	}
+
+	if (set_page_dirty(dn->node_page))
+		dn->node_changed = true;
+	return 0;
+}
+
+/* Should keep dn->ofs_in_node unchanged */
+int f2fs_reserve_new_block(struct dnode_of_data *dn)
+{
+	unsigned int ofs_in_node = dn->ofs_in_node;
+	int ret;
+
+	ret = f2fs_reserve_new_blocks(dn, 1);
+	dn->ofs_in_node = ofs_in_node;
+	return ret;
+}
+
+int f2fs_reserve_block(struct dnode_of_data *dn, pgoff_t index)
+{
+	bool need_put = dn->inode_page ? false : true;
+	int err;
+
+	err = f2fs_get_dnode_of_data(dn, index, ALLOC_NODE);
+	if (err)
+		return err;
+
+	if (dn->data_blkaddr == NULL_ADDR)
+		err = f2fs_reserve_new_block(dn);
+	if (err || need_put)
+		f2fs_put_dnode(dn);
+	return err;
+}
+
+int f2fs_get_block(struct dnode_of_data *dn, pgoff_t index)
+{
+	struct extent_info ei = {0, };
+	struct inode *inode = dn->inode;
+
+	if (f2fs_lookup_read_extent_cache(inode, index, &ei)) {
+		dn->data_blkaddr = ei.blk + index - ei.fofs;
+		return 0;
+	}
+
+	return f2fs_reserve_block(dn, index);
+}
+
+struct page *f2fs_get_read_data_page(struct inode *inode, pgoff_t index,
+				     blk_opf_t op_flags, bool for_write,
+				     pgoff_t *next_pgofs)
+{
+	struct address_space *mapping = inode->i_mapping;
+	struct dnode_of_data dn;
+	struct page *page;
+	struct extent_info ei = {0, };
+	int err;
+
+	page = f2fs_grab_cache_page(mapping, index, for_write);
+	if (!page)
+		return ERR_PTR(-ENOMEM);
+
+	if (f2fs_lookup_read_extent_cache(inode, index, &ei)) {
+		dn.data_blkaddr = ei.blk + index - ei.fofs;
+		if (!f2fs_is_valid_blkaddr(F2FS_I_SB(inode), dn.data_blkaddr,
+						DATA_GENERIC_ENHANCE_READ)) {
+			err = -EFSCORRUPTED;
+			f2fs_handle_error(F2FS_I_SB(inode),
+						ERROR_INVALID_BLKADDR);
+			goto put_err;
+		}
+		goto got_it;
+	}
+
+	set_new_dnode(&dn, inode, NULL, NULL, 0);
+	err = f2fs_get_dnode_of_data(&dn, index, LOOKUP_NODE);
+	if (err) {
+		if (err == -ENOENT && next_pgofs)
+			*next_pgofs = f2fs_get_next_page_offset(&dn, index);
+		goto put_err;
+	}
+	f2fs_put_dnode(&dn);
+
+	if (unlikely(dn.data_blkaddr == NULL_ADDR)) {
+		err = -ENOENT;
+		if (next_pgofs)
+			*next_pgofs = index + 1;
+		goto put_err;
+	}
+	if (dn.data_blkaddr != NEW_ADDR &&
+			!f2fs_is_valid_blkaddr(F2FS_I_SB(inode),
+						dn.data_blkaddr,
+						DATA_GENERIC_ENHANCE)) {
+		err = -EFSCORRUPTED;
+		f2fs_handle_error(F2FS_I_SB(inode),
+					ERROR_INVALID_BLKADDR);
+		goto put_err;
+	}
+got_it:
+	if (PageUptodate(page)) {
+		unlock_page(page);
+		return page;
+	}
+
+	/*
+	 * A new dentry page is allocated but not able to be written, since its
+	 * new inode page couldn't be allocated due to -ENOSPC.
+	 * In such the case, its blkaddr can be remained as NEW_ADDR.
+	 * see, f2fs_add_link -> f2fs_get_new_data_page ->
+	 * f2fs_init_inode_metadata.
+	 */
+	if (dn.data_blkaddr == NEW_ADDR) {
+		zero_user_segment(page, 0, PAGE_SIZE);
+		if (!PageUptodate(page))
+			SetPageUptodate(page);
+		unlock_page(page);
+		return page;
+	}
+
+	err = f2fs_submit_page_read(inode, page, dn.data_blkaddr,
+						op_flags, for_write);
+	if (err)
+		goto put_err;
+	return page;
+
+put_err:
+	f2fs_put_page(page, 1);
+	return ERR_PTR(err);
+}
+
+struct page *f2fs_find_data_page(struct inode *inode, pgoff_t index,
+					pgoff_t *next_pgofs)
+{
+	struct address_space *mapping = inode->i_mapping;
+	struct page *page;
+
+	page = find_get_page(mapping, index);
+	if (page && PageUptodate(page))
+		return page;
+	f2fs_put_page(page, 0);
+
+	page = f2fs_get_read_data_page(inode, index, 0, false, next_pgofs);
+	if (IS_ERR(page))
+		return page;
+
+	if (PageUptodate(page))
+		return page;
+
+	wait_on_page_locked(page);
+	if (unlikely(!PageUptodate(page))) {
+		f2fs_put_page(page, 0);
+		return ERR_PTR(-EIO);
+	}
+	return page;
+}
+
+/*
+ * If it tries to access a hole, return an error.
+ * Because, the callers, functions in dir.c and GC, should be able to know
+ * whether this page exists or not.
+ */
+struct page *f2fs_get_lock_data_page(struct inode *inode, pgoff_t index,
+							bool for_write)
+{
+	struct address_space *mapping = inode->i_mapping;
+	struct page *page;
+
+	page = f2fs_get_read_data_page(inode, index, 0, for_write, NULL);
+	if (IS_ERR(page))
+		return page;
+
+	/* wait for read completion */
+	lock_page(page);
+	if (unlikely(page->mapping != mapping || !PageUptodate(page))) {
+		f2fs_put_page(page, 1);
+		return ERR_PTR(-EIO);
+	}
+	return page;
+}
+
+/*
+ * Caller ensures that this data page is never allocated.
+ * A new zero-filled data page is allocated in the page cache.
+ *
+ * Also, caller should grab and release a rwsem by calling f2fs_lock_op() and
+ * f2fs_unlock_op().
+ * Note that, ipage is set only by make_empty_dir, and if any error occur,
+ * ipage should be released by this function.
+ */
+struct page *f2fs_get_new_data_page(struct inode *inode,
+		struct page *ipage, pgoff_t index, bool new_i_size)
+{
+	struct address_space *mapping = inode->i_mapping;
+	struct page *page;
+	struct dnode_of_data dn;
+	int err;
+
+	page = f2fs_grab_cache_page(mapping, index, true);
+	if (!page) {
+		/*
+		 * before exiting, we should make sure ipage will be released
+		 * if any error occur.
+		 */
+		f2fs_put_page(ipage, 1);
+		return ERR_PTR(-ENOMEM);
+	}
+
+	set_new_dnode(&dn, inode, ipage, NULL, 0);
+	err = f2fs_reserve_block(&dn, index);
+	if (err) {
+		f2fs_put_page(page, 1);
+		return ERR_PTR(err);
+	}
+	if (!ipage)
+		f2fs_put_dnode(&dn);
+
+	if (PageUptodate(page))
+		goto got_it;
+
+	if (dn.data_blkaddr == NEW_ADDR) {
+		zero_user_segment(page, 0, PAGE_SIZE);
+		if (!PageUptodate(page))
+			SetPageUptodate(page);
+	} else {
+		f2fs_put_page(page, 1);
+
+		/* if ipage exists, blkaddr should be NEW_ADDR */
+		f2fs_bug_on(F2FS_I_SB(inode), ipage);
+		page = f2fs_get_lock_data_page(inode, index, true);
+		if (IS_ERR(page))
+			return page;
+	}
+got_it:
+	if (new_i_size && i_size_read(inode) <
+				((loff_t)(index + 1) << PAGE_SHIFT))
+		f2fs_i_size_write(inode, ((loff_t)(index + 1) << PAGE_SHIFT));
+	return page;
+}
+
+static int __allocate_data_block(struct dnode_of_data *dn, int seg_type)
+{
+	struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode);
+	struct f2fs_summary sum;
+	struct node_info ni;
+	block_t old_blkaddr;
+	blkcnt_t count = 1;
+	int err;
+
+	if (unlikely(is_inode_flag_set(dn->inode, FI_NO_ALLOC)))
+		return -EPERM;
+
+	err = f2fs_get_node_info(sbi, dn->nid, &ni, false);
+	if (err)
+		return err;
+
+	dn->data_blkaddr = f2fs_data_blkaddr(dn);
+	if (dn->data_blkaddr != NULL_ADDR)
+		goto alloc;
+
+	if (unlikely((err = inc_valid_block_count(sbi, dn->inode, &count))))
+		return err;
+
+alloc:
+	set_summary(&sum, dn->nid, dn->ofs_in_node, ni.version);
+	old_blkaddr = dn->data_blkaddr;
+	f2fs_allocate_data_block(sbi, NULL, old_blkaddr, &dn->data_blkaddr,
+				&sum, seg_type, NULL);
+	if (GET_SEGNO(sbi, old_blkaddr) != NULL_SEGNO) {
+		invalidate_mapping_pages(META_MAPPING(sbi),
+					old_blkaddr, old_blkaddr);
+		f2fs_invalidate_compress_page(sbi, old_blkaddr);
+	}
+	f2fs_update_data_blkaddr(dn, dn->data_blkaddr);
+	return 0;
+}
+
+void f2fs_do_map_lock(struct f2fs_sb_info *sbi, int flag, bool lock)
+{
+	if (flag == F2FS_GET_BLOCK_PRE_AIO) {
+		if (lock)
+			f2fs_down_read(&sbi->node_change);
+		else
+			f2fs_up_read(&sbi->node_change);
+	} else {
+		if (lock)
+			f2fs_lock_op(sbi);
+		else
+			f2fs_unlock_op(sbi);
+	}
+}
+
+/*
+ * f2fs_map_blocks() tries to find or build mapping relationship which
+ * maps continuous logical blocks to physical blocks, and return such
+ * info via f2fs_map_blocks structure.
+ */
+int f2fs_map_blocks(struct inode *inode, struct f2fs_map_blocks *map,
+						int create, int flag)
+{
+	unsigned int maxblocks = map->m_len;
+	struct dnode_of_data dn;
+	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
+	int mode = map->m_may_create ? ALLOC_NODE : LOOKUP_NODE;
+	pgoff_t pgofs, end_offset, end;
+	int err = 0, ofs = 1;
+	unsigned int ofs_in_node, last_ofs_in_node;
+	blkcnt_t prealloc;
+	struct extent_info ei = {0, };
+	block_t blkaddr;
+	unsigned int start_pgofs;
+	int bidx = 0;
+
+	if (!maxblocks)
+		return 0;
+
+	map->m_bdev = inode->i_sb->s_bdev;
+	map->m_multidev_dio =
+		f2fs_allow_multi_device_dio(F2FS_I_SB(inode), flag);
+
+	map->m_len = 0;
+	map->m_flags = 0;
+
+	/* it only supports block size == page size */
+	pgofs =	(pgoff_t)map->m_lblk;
+	end = pgofs + maxblocks;
+
+	if (!create && f2fs_lookup_read_extent_cache(inode, pgofs, &ei)) {
+		if (f2fs_lfs_mode(sbi) && flag == F2FS_GET_BLOCK_DIO &&
+							map->m_may_create)
+			goto next_dnode;
+
+		map->m_pblk = ei.blk + pgofs - ei.fofs;
+		map->m_len = min((pgoff_t)maxblocks, ei.fofs + ei.len - pgofs);
+		map->m_flags = F2FS_MAP_MAPPED;
+		if (map->m_next_extent)
+			*map->m_next_extent = pgofs + map->m_len;
+
+		/* for hardware encryption, but to avoid potential issue in future */
+		if (flag == F2FS_GET_BLOCK_DIO)
+			f2fs_wait_on_block_writeback_range(inode,
+						map->m_pblk, map->m_len);
+
+		if (map->m_multidev_dio) {
+			block_t blk_addr = map->m_pblk;
+
+			bidx = f2fs_target_device_index(sbi, map->m_pblk);
+
+			map->m_bdev = FDEV(bidx).bdev;
+			map->m_pblk -= FDEV(bidx).start_blk;
+			map->m_len = min(map->m_len,
+				FDEV(bidx).end_blk + 1 - map->m_pblk);
+
+			if (map->m_may_create)
+				f2fs_update_device_state(sbi, inode->i_ino,
+							blk_addr, map->m_len);
+		}
+		goto out;
+	}
+
+next_dnode:
+	if (map->m_may_create)
+		f2fs_do_map_lock(sbi, flag, true);
+
+	/* When reading holes, we need its node page */
+	set_new_dnode(&dn, inode, NULL, NULL, 0);
+	err = f2fs_get_dnode_of_data(&dn, pgofs, mode);
+	if (err) {
+		if (flag == F2FS_GET_BLOCK_BMAP)
+			map->m_pblk = 0;
+
+		if (err == -ENOENT) {
+			/*
+			 * There is one exceptional case that read_node_page()
+			 * may return -ENOENT due to filesystem has been
+			 * shutdown or cp_error, so force to convert error
+			 * number to EIO for such case.
+			 */
+			if (map->m_may_create &&
+				(is_sbi_flag_set(sbi, SBI_IS_SHUTDOWN) ||
+				f2fs_cp_error(sbi))) {
+				err = -EIO;
+				goto unlock_out;
+			}
+
+			err = 0;
+			if (map->m_next_pgofs)
+				*map->m_next_pgofs =
+					f2fs_get_next_page_offset(&dn, pgofs);
+			if (map->m_next_extent)
+				*map->m_next_extent =
+					f2fs_get_next_page_offset(&dn, pgofs);
+		}
+		goto unlock_out;
+	}
+
+	start_pgofs = pgofs;
+	prealloc = 0;
+	last_ofs_in_node = ofs_in_node = dn.ofs_in_node;
+	end_offset = ADDRS_PER_PAGE(dn.node_page, inode);
+
+next_block:
+	blkaddr = f2fs_data_blkaddr(&dn);
+
+	if (__is_valid_data_blkaddr(blkaddr) &&
+		!f2fs_is_valid_blkaddr(sbi, blkaddr, DATA_GENERIC_ENHANCE)) {
+		err = -EFSCORRUPTED;
+		f2fs_handle_error(sbi, ERROR_INVALID_BLKADDR);
+		goto sync_out;
+	}
+
+	if (__is_valid_data_blkaddr(blkaddr)) {
+		/* use out-place-update for driect IO under LFS mode */
+		if (f2fs_lfs_mode(sbi) && flag == F2FS_GET_BLOCK_DIO &&
+							map->m_may_create) {
+			err = __allocate_data_block(&dn, map->m_seg_type);
+			if (err)
+				goto sync_out;
+			blkaddr = dn.data_blkaddr;
+			set_inode_flag(inode, FI_APPEND_WRITE);
+		}
+	} else {
+		if (create) {
+			if (unlikely(f2fs_cp_error(sbi))) {
+				err = -EIO;
+				goto sync_out;
+			}
+			if (flag == F2FS_GET_BLOCK_PRE_AIO) {
+				if (blkaddr == NULL_ADDR) {
+					prealloc++;
+					last_ofs_in_node = dn.ofs_in_node;
+				}
+			} else {
+				WARN_ON(flag != F2FS_GET_BLOCK_PRE_DIO &&
+					flag != F2FS_GET_BLOCK_DIO);
+				err = __allocate_data_block(&dn,
+							map->m_seg_type);
+				if (!err) {
+					if (flag == F2FS_GET_BLOCK_PRE_DIO)
+						file_need_truncate(inode);
+					set_inode_flag(inode, FI_APPEND_WRITE);
+				}
+			}
+			if (err)
+				goto sync_out;
+			map->m_flags |= F2FS_MAP_NEW;
+			blkaddr = dn.data_blkaddr;
+		} else {
+			if (f2fs_compressed_file(inode) &&
+					f2fs_sanity_check_cluster(&dn) &&
+					(flag != F2FS_GET_BLOCK_FIEMAP ||
+					IS_ENABLED(CONFIG_F2FS_CHECK_FS))) {
+				err = -EFSCORRUPTED;
+				f2fs_handle_error(sbi,
+						ERROR_CORRUPTED_CLUSTER);
+				goto sync_out;
+			}
+			if (flag == F2FS_GET_BLOCK_BMAP) {
+				map->m_pblk = 0;
+				goto sync_out;
+			}
+			if (flag == F2FS_GET_BLOCK_PRECACHE)
+				goto sync_out;
+			if (flag == F2FS_GET_BLOCK_FIEMAP &&
+						blkaddr == NULL_ADDR) {
+				if (map->m_next_pgofs)
+					*map->m_next_pgofs = pgofs + 1;
+				goto sync_out;
+			}
+			if (flag != F2FS_GET_BLOCK_FIEMAP) {
+				/* for defragment case */
+				if (map->m_next_pgofs)
+					*map->m_next_pgofs = pgofs + 1;
+				goto sync_out;
+			}
+		}
+	}
+
+	if (flag == F2FS_GET_BLOCK_PRE_AIO)
+		goto skip;
+
+	if (map->m_multidev_dio)
+		bidx = f2fs_target_device_index(sbi, blkaddr);
+
+	if (map->m_len == 0) {
+		/* preallocated unwritten block should be mapped for fiemap. */
+		if (blkaddr == NEW_ADDR)
+			map->m_flags |= F2FS_MAP_UNWRITTEN;
+		map->m_flags |= F2FS_MAP_MAPPED;
+
+		map->m_pblk = blkaddr;
+		map->m_len = 1;
+
+		if (map->m_multidev_dio)
+			map->m_bdev = FDEV(bidx).bdev;
+	} else if ((map->m_pblk != NEW_ADDR &&
+			blkaddr == (map->m_pblk + ofs)) ||
+			(map->m_pblk == NEW_ADDR && blkaddr == NEW_ADDR) ||
+			flag == F2FS_GET_BLOCK_PRE_DIO) {
+		if (map->m_multidev_dio && map->m_bdev != FDEV(bidx).bdev)
+			goto sync_out;
+		ofs++;
+		map->m_len++;
+	} else {
+		goto sync_out;
+	}
+
+skip:
+	dn.ofs_in_node++;
+	pgofs++;
+
+	/* preallocate blocks in batch for one dnode page */
+	if (flag == F2FS_GET_BLOCK_PRE_AIO &&
+			(pgofs == end || dn.ofs_in_node == end_offset)) {
+
+		dn.ofs_in_node = ofs_in_node;
+		err = f2fs_reserve_new_blocks(&dn, prealloc);
+		if (err)
+			goto sync_out;
+
+		map->m_len += dn.ofs_in_node - ofs_in_node;
+		if (prealloc && dn.ofs_in_node != last_ofs_in_node + 1) {
+			err = -ENOSPC;
+			goto sync_out;
+		}
+		dn.ofs_in_node = end_offset;
+	}
+
+	if (pgofs >= end)
+		goto sync_out;
+	else if (dn.ofs_in_node < end_offset)
+		goto next_block;
+
+	if (flag == F2FS_GET_BLOCK_PRECACHE) {
+		if (map->m_flags & F2FS_MAP_MAPPED) {
+			unsigned int ofs = start_pgofs - map->m_lblk;
+
+			f2fs_update_read_extent_cache_range(&dn,
+				start_pgofs, map->m_pblk + ofs,
+				map->m_len - ofs);
+		}
+	}
+
+	f2fs_put_dnode(&dn);
+
+	if (map->m_may_create) {
+		f2fs_do_map_lock(sbi, flag, false);
+		f2fs_balance_fs(sbi, dn.node_changed);
+	}
+	goto next_dnode;
+
+sync_out:
+
+	if (flag == F2FS_GET_BLOCK_DIO && map->m_flags & F2FS_MAP_MAPPED) {
+		/*
+		 * for hardware encryption, but to avoid potential issue
+		 * in future
+		 */
+		f2fs_wait_on_block_writeback_range(inode,
+						map->m_pblk, map->m_len);
+
+		if (map->m_multidev_dio) {
+			block_t blk_addr = map->m_pblk;
+
+			bidx = f2fs_target_device_index(sbi, map->m_pblk);
+
+			map->m_bdev = FDEV(bidx).bdev;
+			map->m_pblk -= FDEV(bidx).start_blk;
+
+			if (map->m_may_create)
+				f2fs_update_device_state(sbi, inode->i_ino,
+							blk_addr, map->m_len);
+
+			f2fs_bug_on(sbi, blk_addr + map->m_len >
+						FDEV(bidx).end_blk + 1);
+		}
+	}
+
+	if (flag == F2FS_GET_BLOCK_PRECACHE) {
+		if (map->m_flags & F2FS_MAP_MAPPED) {
+			unsigned int ofs = start_pgofs - map->m_lblk;
+
+			f2fs_update_read_extent_cache_range(&dn,
+				start_pgofs, map->m_pblk + ofs,
+				map->m_len - ofs);
+		}
+		if (map->m_next_extent)
+			*map->m_next_extent = pgofs + 1;
+	}
+	f2fs_put_dnode(&dn);
+unlock_out:
+	if (map->m_may_create) {
+		f2fs_do_map_lock(sbi, flag, false);
+		f2fs_balance_fs(sbi, dn.node_changed);
+	}
+out:
+	trace_f2fs_map_blocks(inode, map, create, flag, err);
+	return err;
+}
+
+bool f2fs_overwrite_io(struct inode *inode, loff_t pos, size_t len)
+{
+	struct f2fs_map_blocks map;
+	block_t last_lblk;
+	int err;
+
+	if (pos + len > i_size_read(inode))
+		return false;
+
+	map.m_lblk = F2FS_BYTES_TO_BLK(pos);
+	map.m_next_pgofs = NULL;
+	map.m_next_extent = NULL;
+	map.m_seg_type = NO_CHECK_TYPE;
+	map.m_may_create = false;
+	last_lblk = F2FS_BLK_ALIGN(pos + len);
+
+	while (map.m_lblk < last_lblk) {
+		map.m_len = last_lblk - map.m_lblk;
+		err = f2fs_map_blocks(inode, &map, 0, F2FS_GET_BLOCK_DEFAULT);
+		if (err || map.m_len == 0)
+			return false;
+		map.m_lblk += map.m_len;
+	}
+	return true;
+}
+
+static inline u64 bytes_to_blks(struct inode *inode, u64 bytes)
+{
+	return (bytes >> inode->i_blkbits);
+}
+
+static inline u64 blks_to_bytes(struct inode *inode, u64 blks)
+{
+	return (blks << inode->i_blkbits);
+}
+
+static int f2fs_xattr_fiemap(struct inode *inode,
+				struct fiemap_extent_info *fieinfo)
+{
+	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
+	struct page *page;
+	struct node_info ni;
+	__u64 phys = 0, len;
+	__u32 flags;
+	nid_t xnid = F2FS_I(inode)->i_xattr_nid;
+	int err = 0;
+
+	if (f2fs_has_inline_xattr(inode)) {
+		int offset;
+
+		page = f2fs_grab_cache_page(NODE_MAPPING(sbi),
+						inode->i_ino, false);
+		if (!page)
+			return -ENOMEM;
+
+		err = f2fs_get_node_info(sbi, inode->i_ino, &ni, false);
+		if (err) {
+			f2fs_put_page(page, 1);
+			return err;
+		}
+
+		phys = blks_to_bytes(inode, ni.blk_addr);
+		offset = offsetof(struct f2fs_inode, i_addr) +
+					sizeof(__le32) * (DEF_ADDRS_PER_INODE -
+					get_inline_xattr_addrs(inode));
+
+		phys += offset;
+		len = inline_xattr_size(inode);
+
+		f2fs_put_page(page, 1);
+
+		flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_NOT_ALIGNED;
+
+		if (!xnid)
+			flags |= FIEMAP_EXTENT_LAST;
+
+		err = fiemap_fill_next_extent(fieinfo, 0, phys, len, flags);
+		trace_f2fs_fiemap(inode, 0, phys, len, flags, err);
+		if (err)
+			return err;
+	}
+
+	if (xnid) {
+		page = f2fs_grab_cache_page(NODE_MAPPING(sbi), xnid, false);
+		if (!page)
+			return -ENOMEM;
+
+		err = f2fs_get_node_info(sbi, xnid, &ni, false);
+		if (err) {
+			f2fs_put_page(page, 1);
+			return err;
+		}
+
+		phys = blks_to_bytes(inode, ni.blk_addr);
+		len = inode->i_sb->s_blocksize;
+
+		f2fs_put_page(page, 1);
+
+		flags = FIEMAP_EXTENT_LAST;
+	}
+
+	if (phys) {
+		err = fiemap_fill_next_extent(fieinfo, 0, phys, len, flags);
+		trace_f2fs_fiemap(inode, 0, phys, len, flags, err);
+	}
+
+	return (err < 0 ? err : 0);
+}
+
+static loff_t max_inode_blocks(struct inode *inode)
+{
+	loff_t result = ADDRS_PER_INODE(inode);
+	loff_t leaf_count = ADDRS_PER_BLOCK(inode);
+
+	/* two direct node blocks */
+	result += (leaf_count * 2);
+
+	/* two indirect node blocks */
+	leaf_count *= NIDS_PER_BLOCK;
+	result += (leaf_count * 2);
+
+	/* one double indirect node block */
+	leaf_count *= NIDS_PER_BLOCK;
+	result += leaf_count;
+
+	return result;
+}
+
+int f2fs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
+		u64 start, u64 len)
+{
+	struct f2fs_map_blocks map;
+	sector_t start_blk, last_blk;
+	pgoff_t next_pgofs;
+	u64 logical = 0, phys = 0, size = 0;
+	u32 flags = 0;
+	int ret = 0;
+	bool compr_cluster = false, compr_appended;
+	unsigned int cluster_size = F2FS_I(inode)->i_cluster_size;
+	unsigned int count_in_cluster = 0;
+	loff_t maxbytes;
+
+	if (fieinfo->fi_flags & FIEMAP_FLAG_CACHE) {
+		ret = f2fs_precache_extents(inode);
+		if (ret)
+			return ret;
+	}
+
+	ret = fiemap_prep(inode, fieinfo, start, &len, FIEMAP_FLAG_XATTR);
+	if (ret)
+		return ret;
+
+	inode_lock(inode);
+
+	maxbytes = max_file_blocks(inode) << F2FS_BLKSIZE_BITS;
+	if (start > maxbytes) {
+		ret = -EFBIG;
+		goto out;
+	}
+
+	if (len > maxbytes || (maxbytes - len) < start)
+		len = maxbytes - start;
+
+	if (fieinfo->fi_flags & FIEMAP_FLAG_XATTR) {
+		ret = f2fs_xattr_fiemap(inode, fieinfo);
+		goto out;
+	}
+
+	if (f2fs_has_inline_data(inode) || f2fs_has_inline_dentry(inode)) {
+		ret = f2fs_inline_data_fiemap(inode, fieinfo, start, len);
+		if (ret != -EAGAIN)
+			goto out;
+	}
+
+	if (bytes_to_blks(inode, len) == 0)
+		len = blks_to_bytes(inode, 1);
+
+	start_blk = bytes_to_blks(inode, start);
+	last_blk = bytes_to_blks(inode, start + len - 1);
+
+next:
+	memset(&map, 0, sizeof(map));
+	map.m_lblk = start_blk;
+	map.m_len = bytes_to_blks(inode, len);
+	map.m_next_pgofs = &next_pgofs;
+	map.m_seg_type = NO_CHECK_TYPE;
+
+	if (compr_cluster) {
+		map.m_lblk += 1;
+		map.m_len = cluster_size - count_in_cluster;
+	}
+
+	ret = f2fs_map_blocks(inode, &map, 0, F2FS_GET_BLOCK_FIEMAP);
+	if (ret)
+		goto out;
+
+	/* HOLE */
+	if (!compr_cluster && !(map.m_flags & F2FS_MAP_FLAGS)) {
+		start_blk = next_pgofs;
+
+		if (blks_to_bytes(inode, start_blk) < blks_to_bytes(inode,
+						max_inode_blocks(inode)))
+			goto prep_next;
+
+		flags |= FIEMAP_EXTENT_LAST;
+	}
+
+	compr_appended = false;
+	/* In a case of compressed cluster, append this to the last extent */
+	if (compr_cluster && ((map.m_flags & F2FS_MAP_UNWRITTEN) ||
+			!(map.m_flags & F2FS_MAP_FLAGS))) {
+		compr_appended = true;
+		goto skip_fill;
+	}
+
+	if (size) {
+		flags |= FIEMAP_EXTENT_MERGED;
+		if (IS_ENCRYPTED(inode))
+			flags |= FIEMAP_EXTENT_DATA_ENCRYPTED;
+
+		ret = fiemap_fill_next_extent(fieinfo, logical,
+				phys, size, flags);
+		trace_f2fs_fiemap(inode, logical, phys, size, flags, ret);
+		if (ret)
+			goto out;
+		size = 0;
+	}
+
+	if (start_blk > last_blk)
+		goto out;
+
+skip_fill:
+	if (map.m_pblk == COMPRESS_ADDR) {
+		compr_cluster = true;
+		count_in_cluster = 1;
+	} else if (compr_appended) {
+		unsigned int appended_blks = cluster_size -
+						count_in_cluster + 1;
+		size += blks_to_bytes(inode, appended_blks);
+		start_blk += appended_blks;
+		compr_cluster = false;
+	} else {
+		logical = blks_to_bytes(inode, start_blk);
+		phys = __is_valid_data_blkaddr(map.m_pblk) ?
+			blks_to_bytes(inode, map.m_pblk) : 0;
+		size = blks_to_bytes(inode, map.m_len);
+		flags = 0;
+
+		if (compr_cluster) {
+			flags = FIEMAP_EXTENT_ENCODED;
+			count_in_cluster += map.m_len;
+			if (count_in_cluster == cluster_size) {
+				compr_cluster = false;
+				size += blks_to_bytes(inode, 1);
+			}
+		} else if (map.m_flags & F2FS_MAP_UNWRITTEN) {
+			flags = FIEMAP_EXTENT_UNWRITTEN;
+		}
+
+		start_blk += bytes_to_blks(inode, size);
+	}
+
+prep_next:
+	cond_resched();
+	if (fatal_signal_pending(current))
+		ret = -EINTR;
+	else
+		goto next;
+out:
+	if (ret == 1)
+		ret = 0;
+
+	inode_unlock(inode);
+	return ret;
+}
+
+static inline loff_t f2fs_readpage_limit(struct inode *inode)
+{
+	if (IS_ENABLED(CONFIG_FS_VERITY) &&
+	    (IS_VERITY(inode) || f2fs_verity_in_progress(inode)))
+		return inode->i_sb->s_maxbytes;
+
+	return i_size_read(inode);
+}
+
+static int f2fs_read_single_page(struct inode *inode, struct page *page,
+					unsigned nr_pages,
+					struct f2fs_map_blocks *map,
+					struct bio **bio_ret,
+					sector_t *last_block_in_bio,
+					bool is_readahead)
+{
+	struct bio *bio = *bio_ret;
+	const unsigned blocksize = blks_to_bytes(inode, 1);
+	sector_t block_in_file;
+	sector_t last_block;
+	sector_t last_block_in_file;
+	sector_t block_nr;
+	int ret = 0;
+
+	block_in_file = (sector_t)page_index(page);
+	last_block = block_in_file + nr_pages;
+	last_block_in_file = bytes_to_blks(inode,
+			f2fs_readpage_limit(inode) + blocksize - 1);
+	if (last_block > last_block_in_file)
+		last_block = last_block_in_file;
+
+	/* just zeroing out page which is beyond EOF */
+	if (block_in_file >= last_block)
+		goto zero_out;
+	/*
+	 * Map blocks using the previous result first.
+	 */
+	if ((map->m_flags & F2FS_MAP_MAPPED) &&
+			block_in_file > map->m_lblk &&
+			block_in_file < (map->m_lblk + map->m_len))
+		goto got_it;
+
+	/*
+	 * Then do more f2fs_map_blocks() calls until we are
+	 * done with this page.
+	 */
+	map->m_lblk = block_in_file;
+	map->m_len = last_block - block_in_file;
+
+	ret = f2fs_map_blocks(inode, map, 0, F2FS_GET_BLOCK_DEFAULT);
+	if (ret)
+		goto out;
+got_it:
+	if ((map->m_flags & F2FS_MAP_MAPPED)) {
+		block_nr = map->m_pblk + block_in_file - map->m_lblk;
+		SetPageMappedToDisk(page);
+
+		if (!f2fs_is_valid_blkaddr(F2FS_I_SB(inode), block_nr,
+						DATA_GENERIC_ENHANCE_READ)) {
+			ret = -EFSCORRUPTED;
+			f2fs_handle_error(F2FS_I_SB(inode),
+						ERROR_INVALID_BLKADDR);
+			goto out;
+		}
+	} else {
+zero_out:
+		zero_user_segment(page, 0, PAGE_SIZE);
+		if (f2fs_need_verity(inode, page->index) &&
+		    !fsverity_verify_page(page)) {
+			ret = -EIO;
+			goto out;
+		}
+		if (!PageUptodate(page))
+			SetPageUptodate(page);
+		unlock_page(page);
+		goto out;
+	}
+
+	/*
+	 * This page will go to BIO.  Do we need to send this
+	 * BIO off first?
+	 */
+	if (bio && (!page_is_mergeable(F2FS_I_SB(inode), bio,
+				       *last_block_in_bio, block_nr) ||
+		    !f2fs_crypt_mergeable_bio(bio, inode, page->index, NULL))) {
+submit_and_realloc:
+		__submit_bio(F2FS_I_SB(inode), bio, DATA);
+		bio = NULL;
+	}
+	if (bio == NULL) {
+		bio = f2fs_grab_read_bio(inode, block_nr, nr_pages,
+				is_readahead ? REQ_RAHEAD : 0, page->index,
+				false);
+		if (IS_ERR(bio)) {
+			ret = PTR_ERR(bio);
+			bio = NULL;
+			goto out;
+		}
+	}
+
+	/*
+	 * If the page is under writeback, we need to wait for
+	 * its completion to see the correct decrypted data.
+	 */
+	f2fs_wait_on_block_writeback(inode, block_nr);
+
+	if (bio_add_page(bio, page, blocksize, 0) < blocksize)
+		goto submit_and_realloc;
+
+	inc_page_count(F2FS_I_SB(inode), F2FS_RD_DATA);
+	f2fs_update_iostat(F2FS_I_SB(inode), NULL, FS_DATA_READ_IO,
+							F2FS_BLKSIZE);
+	ClearPageError(page);
+	*last_block_in_bio = block_nr;
+	goto out;
+out:
+	*bio_ret = bio;
+	return ret;
+}
+
+#ifdef CONFIG_F2FS_FS_COMPRESSION
+int f2fs_read_multi_pages(struct compress_ctx *cc, struct bio **bio_ret,
+				unsigned nr_pages, sector_t *last_block_in_bio,
+				bool is_readahead, bool for_write)
+{
+	struct dnode_of_data dn;
+	struct inode *inode = cc->inode;
+	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
+	struct bio *bio = *bio_ret;
+	unsigned int start_idx = cc->cluster_idx << cc->log_cluster_size;
+	sector_t last_block_in_file;
+	const unsigned blocksize = blks_to_bytes(inode, 1);
+	struct decompress_io_ctx *dic = NULL;
+	struct extent_info ei = {0, };
+	bool from_dnode = true;
+	int i;
+	int ret = 0;
+
+	f2fs_bug_on(sbi, f2fs_cluster_is_empty(cc));
+
+	last_block_in_file = bytes_to_blks(inode,
+			f2fs_readpage_limit(inode) + blocksize - 1);
+
+	/* get rid of pages beyond EOF */
+	for (i = 0; i < cc->cluster_size; i++) {
+		struct page *page = cc->rpages[i];
+
+		if (!page)
+			continue;
+		if ((sector_t)page->index >= last_block_in_file) {
+			zero_user_segment(page, 0, PAGE_SIZE);
+			if (!PageUptodate(page))
+				SetPageUptodate(page);
+		} else if (!PageUptodate(page)) {
+			continue;
+		}
+		unlock_page(page);
+		if (for_write)
+			put_page(page);
+		cc->rpages[i] = NULL;
+		cc->nr_rpages--;
+	}
+
+	/* we are done since all pages are beyond EOF */
+	if (f2fs_cluster_is_empty(cc))
+		goto out;
+
+	if (f2fs_lookup_read_extent_cache(inode, start_idx, &ei))
+		from_dnode = false;
+
+	if (!from_dnode)
+		goto skip_reading_dnode;
+
+	set_new_dnode(&dn, inode, NULL, NULL, 0);
+	ret = f2fs_get_dnode_of_data(&dn, start_idx, LOOKUP_NODE);
+	if (ret)
+		goto out;
+
+	f2fs_bug_on(sbi, dn.data_blkaddr != COMPRESS_ADDR);
+
+skip_reading_dnode:
+	for (i = 1; i < cc->cluster_size; i++) {
+		block_t blkaddr;
+
+		blkaddr = from_dnode ? data_blkaddr(dn.inode, dn.node_page,
+					dn.ofs_in_node + i) :
+					ei.blk + i - 1;
+
+		if (!__is_valid_data_blkaddr(blkaddr))
+			break;
+
+		if (!f2fs_is_valid_blkaddr(sbi, blkaddr, DATA_GENERIC)) {
+			ret = -EFAULT;
+			goto out_put_dnode;
+		}
+		cc->nr_cpages++;
+
+		if (!from_dnode && i >= ei.c_len)
+			break;
+	}
+
+	/* nothing to decompress */
+	if (cc->nr_cpages == 0) {
+		ret = 0;
+		goto out_put_dnode;
+	}
+
+	dic = f2fs_alloc_dic(cc);
+	if (IS_ERR(dic)) {
+		ret = PTR_ERR(dic);
+		goto out_put_dnode;
+	}
+
+	for (i = 0; i < cc->nr_cpages; i++) {
+		struct page *page = dic->cpages[i];
+		block_t blkaddr;
+		struct bio_post_read_ctx *ctx;
+
+		blkaddr = from_dnode ? data_blkaddr(dn.inode, dn.node_page,
+					dn.ofs_in_node + i + 1) :
+					ei.blk + i;
+
+		f2fs_wait_on_block_writeback(inode, blkaddr);
+
+		if (f2fs_load_compressed_page(sbi, page, blkaddr)) {
+			if (atomic_dec_and_test(&dic->remaining_pages)) {
+				f2fs_decompress_cluster(dic, true);
+				break;
+			}
+			continue;
+		}
+
+		if (bio && (!page_is_mergeable(sbi, bio,
+					*last_block_in_bio, blkaddr) ||
+		    !f2fs_crypt_mergeable_bio(bio, inode, page->index, NULL))) {
+submit_and_realloc:
+			__submit_bio(sbi, bio, DATA);
+			bio = NULL;
+		}
+
+		if (!bio) {
+			bio = f2fs_grab_read_bio(inode, blkaddr, nr_pages,
+					is_readahead ? REQ_RAHEAD : 0,
+					page->index, for_write);
+			if (IS_ERR(bio)) {
+				ret = PTR_ERR(bio);
+				f2fs_decompress_end_io(dic, ret, true);
+				f2fs_put_dnode(&dn);
+				*bio_ret = NULL;
+				return ret;
+			}
+		}
+
+		if (bio_add_page(bio, page, blocksize, 0) < blocksize)
+			goto submit_and_realloc;
+
+		ctx = get_post_read_ctx(bio);
+		ctx->enabled_steps |= STEP_DECOMPRESS;
+		refcount_inc(&dic->refcnt);
+
+		inc_page_count(sbi, F2FS_RD_DATA);
+		f2fs_update_iostat(sbi, inode, FS_DATA_READ_IO, F2FS_BLKSIZE);
+		ClearPageError(page);
+		*last_block_in_bio = blkaddr;
+	}
+
+	if (from_dnode)
+		f2fs_put_dnode(&dn);
+
+	*bio_ret = bio;
+	return 0;
+
+out_put_dnode:
+	if (from_dnode)
+		f2fs_put_dnode(&dn);
+out:
+	for (i = 0; i < cc->cluster_size; i++) {
+		if (cc->rpages[i]) {
+			ClearPageUptodate(cc->rpages[i]);
+			ClearPageError(cc->rpages[i]);
+			unlock_page(cc->rpages[i]);
+		}
+	}
+	*bio_ret = bio;
+	return ret;
+}
+#endif
+
+/*
+ * This function was originally taken from fs/mpage.c, and customized for f2fs.
+ * Major change was from block_size == page_size in f2fs by default.
+ */
+static int f2fs_mpage_readpages(struct inode *inode,
+		struct readahead_control *rac, struct page *page)
+{
+	struct bio *bio = NULL;
+	sector_t last_block_in_bio = 0;
+	struct f2fs_map_blocks map;
+#ifdef CONFIG_F2FS_FS_COMPRESSION
+	struct compress_ctx cc = {
+		.inode = inode,
+		.log_cluster_size = F2FS_I(inode)->i_log_cluster_size,
+		.cluster_size = F2FS_I(inode)->i_cluster_size,
+		.cluster_idx = NULL_CLUSTER,
+		.rpages = NULL,
+		.cpages = NULL,
+		.nr_rpages = 0,
+		.nr_cpages = 0,
+	};
+	pgoff_t nc_cluster_idx = NULL_CLUSTER;
+#endif
+	unsigned nr_pages = rac ? readahead_count(rac) : 1;
+	unsigned max_nr_pages = nr_pages;
+	int ret = 0;
+
+	map.m_pblk = 0;
+	map.m_lblk = 0;
+	map.m_len = 0;
+	map.m_flags = 0;
+	map.m_next_pgofs = NULL;
+	map.m_next_extent = NULL;
+	map.m_seg_type = NO_CHECK_TYPE;
+	map.m_may_create = false;
+
+	for (; nr_pages; nr_pages--) {
+		if (rac) {
+			page = readahead_page(rac);
+			prefetchw(&page->flags);
+		}
+
+#ifdef CONFIG_F2FS_FS_COMPRESSION
+		if (f2fs_compressed_file(inode)) {
+			/* there are remained comressed pages, submit them */
+			if (!f2fs_cluster_can_merge_page(&cc, page->index)) {
+				ret = f2fs_read_multi_pages(&cc, &bio,
+							max_nr_pages,
+							&last_block_in_bio,
+							rac != NULL, false);
+				f2fs_destroy_compress_ctx(&cc, false);
+				if (ret)
+					goto set_error_page;
+			}
+			if (cc.cluster_idx == NULL_CLUSTER) {
+				if (nc_cluster_idx ==
+					page->index >> cc.log_cluster_size) {
+					goto read_single_page;
+				}
+
+				ret = f2fs_is_compressed_cluster(inode, page->index);
+				if (ret < 0)
+					goto set_error_page;
+				else if (!ret) {
+					nc_cluster_idx =
+						page->index >> cc.log_cluster_size;
+					goto read_single_page;
+				}
+
+				nc_cluster_idx = NULL_CLUSTER;
+			}
+			ret = f2fs_init_compress_ctx(&cc);
+			if (ret)
+				goto set_error_page;
+
+			f2fs_compress_ctx_add_page(&cc, page);
+
+			goto next_page;
+		}
+read_single_page:
+#endif
+
+		ret = f2fs_read_single_page(inode, page, max_nr_pages, &map,
+					&bio, &last_block_in_bio, rac);
+		if (ret) {
+#ifdef CONFIG_F2FS_FS_COMPRESSION
+set_error_page:
+#endif
+			SetPageError(page);
+			zero_user_segment(page, 0, PAGE_SIZE);
+			unlock_page(page);
+		}
+#ifdef CONFIG_F2FS_FS_COMPRESSION
+next_page:
+#endif
+		if (rac)
+			put_page(page);
+
+#ifdef CONFIG_F2FS_FS_COMPRESSION
+		if (f2fs_compressed_file(inode)) {
+			/* last page */
+			if (nr_pages == 1 && !f2fs_cluster_is_empty(&cc)) {
+				ret = f2fs_read_multi_pages(&cc, &bio,
+							max_nr_pages,
+							&last_block_in_bio,
+							rac != NULL, false);
+				f2fs_destroy_compress_ctx(&cc, false);
+			}
+		}
+#endif
+	}
+	if (bio)
+		__submit_bio(F2FS_I_SB(inode), bio, DATA);
+	return ret;
+}
+
+static int f2fs_read_data_folio(struct file *file, struct folio *folio)
+{
+	struct page *page = &folio->page;
+	struct inode *inode = page_file_mapping(page)->host;
+	int ret = -EAGAIN;
+
+	trace_f2fs_readpage(page, DATA);
+
+	if (!f2fs_is_compress_backend_ready(inode)) {
+		unlock_page(page);
+		return -EOPNOTSUPP;
+	}
+
+	/* If the file has inline data, try to read it directly */
+	if (f2fs_has_inline_data(inode))
+		ret = f2fs_read_inline_data(inode, page);
+	if (ret == -EAGAIN)
+		ret = f2fs_mpage_readpages(inode, NULL, page);
+	return ret;
+}
+
+static void f2fs_readahead(struct readahead_control *rac)
+{
+	struct inode *inode = rac->mapping->host;
+
+	trace_f2fs_readpages(inode, readahead_index(rac), readahead_count(rac));
+
+	if (!f2fs_is_compress_backend_ready(inode))
+		return;
+
+	/* If the file has inline data, skip readahead */
+	if (f2fs_has_inline_data(inode))
+		return;
+
+	f2fs_mpage_readpages(inode, rac, NULL);
+}
+
+int f2fs_encrypt_one_page(struct f2fs_io_info *fio)
+{
+	struct inode *inode = fio->page->mapping->host;
+	struct page *mpage, *page;
+	gfp_t gfp_flags = GFP_NOFS;
+
+	if (!f2fs_encrypted_file(inode))
+		return 0;
+
+	page = fio->compressed_page ? fio->compressed_page : fio->page;
+
+	if (fscrypt_inode_uses_inline_crypto(inode))
+		return 0;
+
+retry_encrypt:
+	fio->encrypted_page = fscrypt_encrypt_pagecache_blocks(page,
+					PAGE_SIZE, 0, gfp_flags);
+	if (IS_ERR(fio->encrypted_page)) {
+		/* flush pending IOs and wait for a while in the ENOMEM case */
+		if (PTR_ERR(fio->encrypted_page) == -ENOMEM) {
+			f2fs_flush_merged_writes(fio->sbi);
+			memalloc_retry_wait(GFP_NOFS);
+			gfp_flags |= __GFP_NOFAIL;
+			goto retry_encrypt;
+		}
+		return PTR_ERR(fio->encrypted_page);
+	}
+
+	mpage = find_lock_page(META_MAPPING(fio->sbi), fio->old_blkaddr);
+	if (mpage) {
+		if (PageUptodate(mpage))
+			memcpy(page_address(mpage),
+				page_address(fio->encrypted_page), PAGE_SIZE);
+		f2fs_put_page(mpage, 1);
+	}
+	return 0;
+}
+
+static inline bool check_inplace_update_policy(struct inode *inode,
+				struct f2fs_io_info *fio)
+{
+	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
+	unsigned int policy = SM_I(sbi)->ipu_policy;
+
+	if (policy & (0x1 << F2FS_IPU_HONOR_OPU_WRITE) &&
+			is_inode_flag_set(inode, FI_OPU_WRITE))
+		return false;
+	if (policy & (0x1 << F2FS_IPU_FORCE))
+		return true;
+	if (policy & (0x1 << F2FS_IPU_SSR) && f2fs_need_SSR(sbi))
+		return true;
+	if (policy & (0x1 << F2FS_IPU_UTIL) &&
+			utilization(sbi) > SM_I(sbi)->min_ipu_util)
+		return true;
+	if (policy & (0x1 << F2FS_IPU_SSR_UTIL) && f2fs_need_SSR(sbi) &&
+			utilization(sbi) > SM_I(sbi)->min_ipu_util)
+		return true;
+
+	/*
+	 * IPU for rewrite async pages
+	 */
+	if (policy & (0x1 << F2FS_IPU_ASYNC) &&
+			fio && fio->op == REQ_OP_WRITE &&
+			!(fio->op_flags & REQ_SYNC) &&
+			!IS_ENCRYPTED(inode))
+		return true;
+
+	/* this is only set during fdatasync */
+	if (policy & (0x1 << F2FS_IPU_FSYNC) &&
+			is_inode_flag_set(inode, FI_NEED_IPU))
+		return true;
+
+	if (unlikely(fio && is_sbi_flag_set(sbi, SBI_CP_DISABLED) &&
+			!f2fs_is_checkpointed_data(sbi, fio->old_blkaddr)))
+		return true;
+
+	return false;
+}
+
+bool f2fs_should_update_inplace(struct inode *inode, struct f2fs_io_info *fio)
+{
+	/* swap file is migrating in aligned write mode */
+	if (is_inode_flag_set(inode, FI_ALIGNED_WRITE))
+		return false;
+
+	if (f2fs_is_pinned_file(inode))
+		return true;
+
+	/* if this is cold file, we should overwrite to avoid fragmentation */
+	if (file_is_cold(inode) && !is_inode_flag_set(inode, FI_OPU_WRITE))
+		return true;
+
+	return check_inplace_update_policy(inode, fio);
+}
+
+bool f2fs_should_update_outplace(struct inode *inode, struct f2fs_io_info *fio)
+{
+	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
+
+	/* The below cases were checked when setting it. */
+	if (f2fs_is_pinned_file(inode))
+		return false;
+	if (fio && is_sbi_flag_set(sbi, SBI_NEED_FSCK))
+		return true;
+	if (f2fs_lfs_mode(sbi))
+		return true;
+	if (S_ISDIR(inode->i_mode))
+		return true;
+	if (IS_NOQUOTA(inode))
+		return true;
+	if (f2fs_is_atomic_file(inode))
+		return true;
+
+	/* swap file is migrating in aligned write mode */
+	if (is_inode_flag_set(inode, FI_ALIGNED_WRITE))
+		return true;
+
+	if (is_inode_flag_set(inode, FI_OPU_WRITE))
+		return true;
+
+	if (fio) {
+		if (page_private_gcing(fio->page))
+			return true;
+		if (page_private_dummy(fio->page))
+			return true;
+		if (unlikely(is_sbi_flag_set(sbi, SBI_CP_DISABLED) &&
+			f2fs_is_checkpointed_data(sbi, fio->old_blkaddr)))
+			return true;
+	}
+	return false;
+}
+
+static inline bool need_inplace_update(struct f2fs_io_info *fio)
+{
+	struct inode *inode = fio->page->mapping->host;
+
+	if (f2fs_should_update_outplace(inode, fio))
+		return false;
+
+	return f2fs_should_update_inplace(inode, fio);
+}
+
+int f2fs_do_write_data_page(struct f2fs_io_info *fio)
+{
+	struct page *page = fio->page;
+	struct inode *inode = page->mapping->host;
+	struct dnode_of_data dn;
+	struct extent_info ei = {0, };
+	struct node_info ni;
+	bool ipu_force = false;
+	int err = 0;
+
+	/* Use COW inode to make dnode_of_data for atomic write */
+	if (f2fs_is_atomic_file(inode))
+		set_new_dnode(&dn, F2FS_I(inode)->cow_inode, NULL, NULL, 0);
+	else
+		set_new_dnode(&dn, inode, NULL, NULL, 0);
+
+	if (need_inplace_update(fio) &&
+	    f2fs_lookup_read_extent_cache(inode, page->index, &ei)) {
+		fio->old_blkaddr = ei.blk + page->index - ei.fofs;
+
+		if (!f2fs_is_valid_blkaddr(fio->sbi, fio->old_blkaddr,
+						DATA_GENERIC_ENHANCE)) {
+			f2fs_handle_error(fio->sbi,
+						ERROR_INVALID_BLKADDR);
+			return -EFSCORRUPTED;
+		}
+
+		ipu_force = true;
+		fio->need_lock = LOCK_DONE;
+		goto got_it;
+	}
+
+	/* Deadlock due to between page->lock and f2fs_lock_op */
+	if (fio->need_lock == LOCK_REQ && !f2fs_trylock_op(fio->sbi))
+		return -EAGAIN;
+
+	err = f2fs_get_dnode_of_data(&dn, page->index, LOOKUP_NODE);
+	if (err)
+		goto out;
+
+	fio->old_blkaddr = dn.data_blkaddr;
+
+	/* This page is already truncated */
+	if (fio->old_blkaddr == NULL_ADDR) {
+		ClearPageUptodate(page);
+		clear_page_private_gcing(page);
+		goto out_writepage;
+	}
+got_it:
+	if (__is_valid_data_blkaddr(fio->old_blkaddr) &&
+		!f2fs_is_valid_blkaddr(fio->sbi, fio->old_blkaddr,
+						DATA_GENERIC_ENHANCE)) {
+		err = -EFSCORRUPTED;
+		f2fs_handle_error(fio->sbi, ERROR_INVALID_BLKADDR);
+		goto out_writepage;
+	}
+
+	/* wait for GCed page writeback via META_MAPPING */
+	if (fio->post_read)
+		f2fs_wait_on_block_writeback(inode, fio->old_blkaddr);
+
+	/*
+	 * If current allocation needs SSR,
+	 * it had better in-place writes for updated data.
+	 */
+	if (ipu_force ||
+		(__is_valid_data_blkaddr(fio->old_blkaddr) &&
+					need_inplace_update(fio))) {
+		err = f2fs_encrypt_one_page(fio);
+		if (err)
+			goto out_writepage;
+
+		set_page_writeback(page);
+		ClearPageError(page);
+		f2fs_put_dnode(&dn);
+		if (fio->need_lock == LOCK_REQ)
+			f2fs_unlock_op(fio->sbi);
+		err = f2fs_inplace_write_data(fio);
+		if (err) {
+			if (fscrypt_inode_uses_fs_layer_crypto(inode))
+				fscrypt_finalize_bounce_page(&fio->encrypted_page);
+			if (PageWriteback(page))
+				end_page_writeback(page);
+		} else {
+			set_inode_flag(inode, FI_UPDATE_WRITE);
+		}
+		trace_f2fs_do_write_data_page(fio->page, IPU);
+		return err;
+	}
+
+	if (fio->need_lock == LOCK_RETRY) {
+		if (!f2fs_trylock_op(fio->sbi)) {
+			err = -EAGAIN;
+			goto out_writepage;
+		}
+		fio->need_lock = LOCK_REQ;
+	}
+
+	err = f2fs_get_node_info(fio->sbi, dn.nid, &ni, false);
+	if (err)
+		goto out_writepage;
+
+	fio->version = ni.version;
+
+	err = f2fs_encrypt_one_page(fio);
+	if (err)
+		goto out_writepage;
+
+	set_page_writeback(page);
+	ClearPageError(page);
+
+	if (fio->compr_blocks && fio->old_blkaddr == COMPRESS_ADDR)
+		f2fs_i_compr_blocks_update(inode, fio->compr_blocks - 1, false);
+
+	/* LFS mode write path */
+	f2fs_outplace_write_data(&dn, fio);
+	trace_f2fs_do_write_data_page(page, OPU);
+	set_inode_flag(inode, FI_APPEND_WRITE);
+	if (page->index == 0)
+		set_inode_flag(inode, FI_FIRST_BLOCK_WRITTEN);
+out_writepage:
+	f2fs_put_dnode(&dn);
+out:
+	if (fio->need_lock == LOCK_REQ)
+		f2fs_unlock_op(fio->sbi);
+	return err;
+}
+
+int f2fs_write_single_data_page(struct page *page, int *submitted,
+				struct bio **bio,
+				sector_t *last_block,
+				struct writeback_control *wbc,
+				enum iostat_type io_type,
+				int compr_blocks,
+				bool allow_balance)
+{
+	struct inode *inode = page->mapping->host;
+	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
+	loff_t i_size = i_size_read(inode);
+	const pgoff_t end_index = ((unsigned long long)i_size)
+							>> PAGE_SHIFT;
+	loff_t psize = (loff_t)(page->index + 1) << PAGE_SHIFT;
+	unsigned offset = 0;
+	bool need_balance_fs = false;
+	bool quota_inode = IS_NOQUOTA(inode);
+	int err = 0;
+	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,
+		.page = page,
+		.encrypted_page = NULL,
+		.submitted = false,
+		.compr_blocks = compr_blocks,
+		.need_lock = LOCK_RETRY,
+		.post_read = f2fs_post_read_required(inode),
+		.io_type = io_type,
+		.io_wbc = wbc,
+		.bio = bio,
+		.last_block = last_block,
+	};
+
+	trace_f2fs_writepage(page, DATA);
+
+	/* we should bypass data pages to proceed the kworkder jobs */
+	if (unlikely(f2fs_cp_error(sbi))) {
+		mapping_set_error(page->mapping, -EIO);
+		/*
+		 * don't drop any dirty dentry pages for keeping lastest
+		 * directory structure.
+		 */
+		if (S_ISDIR(inode->i_mode) &&
+				!is_sbi_flag_set(sbi, SBI_IS_CLOSE))
+			goto redirty_out;
+		goto out;
+	}
+
+	if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
+		goto redirty_out;
+
+	if (page->index < end_index ||
+			f2fs_verity_in_progress(inode) ||
+			compr_blocks)
+		goto write;
+
+	/*
+	 * If the offset is out-of-range of file size,
+	 * this page does not have to be written to disk.
+	 */
+	offset = i_size & (PAGE_SIZE - 1);
+	if ((page->index >= end_index + 1) || !offset)
+		goto out;
+
+	zero_user_segment(page, offset, PAGE_SIZE);
+write:
+	if (f2fs_is_drop_cache(inode))
+		goto out;
+
+	/* Dentry/quota blocks are controlled by checkpoint */
+	if (S_ISDIR(inode->i_mode) || quota_inode) {
+		/*
+		 * We need to wait for node_write to avoid block allocation during
+		 * checkpoint. This can only happen to quota writes which can cause
+		 * the below discard race condition.
+		 */
+		if (quota_inode)
+			f2fs_down_read(&sbi->node_write);
+
+		fio.need_lock = LOCK_DONE;
+		err = f2fs_do_write_data_page(&fio);
+
+		if (quota_inode)
+			f2fs_up_read(&sbi->node_write);
+
+		goto done;
+	}
+
+	if (!wbc->for_reclaim)
+		need_balance_fs = true;
+	else if (has_not_enough_free_secs(sbi, 0, 0))
+		goto redirty_out;
+	else
+		set_inode_flag(inode, FI_HOT_DATA);
+
+	err = -EAGAIN;
+	if (f2fs_has_inline_data(inode)) {
+		err = f2fs_write_inline_data(inode, page);
+		if (!err)
+			goto out;
+	}
+
+	if (err == -EAGAIN) {
+		err = f2fs_do_write_data_page(&fio);
+		if (err == -EAGAIN) {
+			fio.need_lock = LOCK_REQ;
+			err = f2fs_do_write_data_page(&fio);
+		}
+	}
+
+	if (err) {
+		file_set_keep_isize(inode);
+	} else {
+		spin_lock(&F2FS_I(inode)->i_size_lock);
+		if (F2FS_I(inode)->last_disk_size < psize)
+			F2FS_I(inode)->last_disk_size = psize;
+		spin_unlock(&F2FS_I(inode)->i_size_lock);
+	}
+
+done:
+	if (err && err != -ENOENT)
+		goto redirty_out;
+
+out:
+	inode_dec_dirty_pages(inode);
+	if (err) {
+		ClearPageUptodate(page);
+		clear_page_private_gcing(page);
+	}
+
+	if (wbc->for_reclaim) {
+		f2fs_submit_merged_write_cond(sbi, NULL, page, 0, DATA);
+		clear_inode_flag(inode, FI_HOT_DATA);
+		f2fs_remove_dirty_inode(inode);
+		submitted = NULL;
+	}
+	unlock_page(page);
+	if (!S_ISDIR(inode->i_mode) && !IS_NOQUOTA(inode) &&
+			!F2FS_I(inode)->wb_task && allow_balance)
+		f2fs_balance_fs(sbi, need_balance_fs);
+
+	if (unlikely(f2fs_cp_error(sbi))) {
+		f2fs_submit_merged_write(sbi, DATA);
+		if (bio && *bio)
+			f2fs_submit_merged_ipu_write(sbi, bio, NULL);
+		submitted = NULL;
+	}
+
+	if (submitted)
+		*submitted = fio.submitted ? 1 : 0;
+
+	return 0;
+
+redirty_out:
+	redirty_page_for_writepage(wbc, page);
+	/*
+	 * pageout() in MM traslates EAGAIN, so calls handle_write_error()
+	 * -> mapping_set_error() -> set_bit(AS_EIO, ...).
+	 * file_write_and_wait_range() will see EIO error, which is critical
+	 * to return value of fsync() followed by atomic_write failure to user.
+	 */
+	if (!err || wbc->for_reclaim)
+		return AOP_WRITEPAGE_ACTIVATE;
+	unlock_page(page);
+	return err;
+}
+
+static int f2fs_write_data_page(struct page *page,
+					struct writeback_control *wbc)
+{
+#ifdef CONFIG_F2FS_FS_COMPRESSION
+	struct inode *inode = page->mapping->host;
+
+	if (unlikely(f2fs_cp_error(F2FS_I_SB(inode))))
+		goto out;
+
+	if (f2fs_compressed_file(inode)) {
+		if (f2fs_is_compressed_cluster(inode, page->index)) {
+			redirty_page_for_writepage(wbc, page);
+			return AOP_WRITEPAGE_ACTIVATE;
+		}
+	}
+out:
+#endif
+
+	return f2fs_write_single_data_page(page, NULL, NULL, NULL,
+						wbc, FS_DATA_IO, 0, true);
+}
+
+/*
+ * This function was copied from write_cche_pages from mm/page-writeback.c.
+ * The major change is making write step of cold data page separately from
+ * warm/hot data page.
+ */
+static int f2fs_write_cache_pages(struct address_space *mapping,
+					struct writeback_control *wbc,
+					enum iostat_type io_type)
+{
+	int ret = 0;
+	int done = 0, retry = 0;
+	struct page *pages_local[F2FS_ONSTACK_PAGES];
+	struct page **pages = pages_local;
+	struct folio_batch fbatch;
+	struct f2fs_sb_info *sbi = F2FS_M_SB(mapping);
+	struct bio *bio = NULL;
+	sector_t last_block;
+#ifdef CONFIG_F2FS_FS_COMPRESSION
+	struct inode *inode = mapping->host;
+	struct compress_ctx cc = {
+		.inode = inode,
+		.log_cluster_size = F2FS_I(inode)->i_log_cluster_size,
+		.cluster_size = F2FS_I(inode)->i_cluster_size,
+		.cluster_idx = NULL_CLUSTER,
+		.rpages = NULL,
+		.nr_rpages = 0,
+		.cpages = NULL,
+		.valid_nr_cpages = 0,
+		.rbuf = NULL,
+		.cbuf = NULL,
+		.rlen = PAGE_SIZE * F2FS_I(inode)->i_cluster_size,
+		.private = NULL,
+	};
+#endif
+	int nr_folios, p, idx;
+	int nr_pages;
+	unsigned int max_pages = F2FS_ONSTACK_PAGES;
+	pgoff_t index;
+	pgoff_t end;		/* Inclusive */
+	pgoff_t done_index;
+	int range_whole = 0;
+	xa_mark_t tag;
+	int nwritten = 0;
+	int submitted = 0;
+	int i;
+
+#ifdef CONFIG_F2FS_FS_COMPRESSION
+	if (f2fs_compressed_file(inode) &&
+		1 << cc.log_cluster_size > F2FS_ONSTACK_PAGES) {
+		pages = f2fs_kzalloc(sbi, sizeof(struct page *) <<
+				cc.log_cluster_size, GFP_NOFS | __GFP_NOFAIL);
+		max_pages = 1 << cc.log_cluster_size;
+	}
+#endif
+
+	folio_batch_init(&fbatch);
+
+	if (get_dirty_pages(mapping->host) <=
+				SM_I(F2FS_M_SB(mapping))->min_hot_blocks)
+		set_inode_flag(mapping->host, FI_HOT_DATA);
+	else
+		clear_inode_flag(mapping->host, FI_HOT_DATA);
+
+	if (wbc->range_cyclic) {
+		index = mapping->writeback_index; /* prev offset */
+		end = -1;
+	} else {
+		index = wbc->range_start >> PAGE_SHIFT;
+		end = wbc->range_end >> PAGE_SHIFT;
+		if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX)
+			range_whole = 1;
+	}
+	if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages)
+		tag = PAGECACHE_TAG_TOWRITE;
+	else
+		tag = PAGECACHE_TAG_DIRTY;
+retry:
+	retry = 0;
+	if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages)
+		tag_pages_for_writeback(mapping, index, end);
+	done_index = index;
+	while (!done && !retry && (index <= end)) {
+		nr_pages = 0;
+again:
+		nr_folios = filemap_get_folios_tag(mapping, &index, end,
+				tag, &fbatch);
+		if (nr_folios == 0) {
+			if (nr_pages)
+				goto write;
+			break;
+		}
+
+		for (i = 0; i < nr_folios; i++) {
+			struct folio *folio = fbatch.folios[i];
+
+			idx = 0;
+			p = folio_nr_pages(folio);
+add_more:
+			pages[nr_pages] = folio_page(folio, idx);
+			folio_get(folio);
+			if (++nr_pages == max_pages) {
+				index = folio->index + idx + 1;
+				folio_batch_release(&fbatch);
+				goto write;
+			}
+			if (++idx < p)
+				goto add_more;
+		}
+		folio_batch_release(&fbatch);
+		goto again;
+write:
+		for (i = 0; i < nr_pages; i++) {
+			struct page *page = pages[i];
+			struct folio *folio = page_folio(page);
+			bool need_readd;
+readd:
+			need_readd = false;
+#ifdef CONFIG_F2FS_FS_COMPRESSION
+			if (f2fs_compressed_file(inode)) {
+				void *fsdata = NULL;
+				struct page *pagep;
+				int ret2;
+
+				ret = f2fs_init_compress_ctx(&cc);
+				if (ret) {
+					done = 1;
+					break;
+				}
+
+				if (!f2fs_cluster_can_merge_page(&cc,
+								folio->index)) {
+					ret = f2fs_write_multi_pages(&cc,
+						&submitted, wbc, io_type);
+					if (!ret)
+						need_readd = true;
+					goto result;
+				}
+
+				if (unlikely(f2fs_cp_error(sbi)))
+					goto lock_folio;
+
+				if (!f2fs_cluster_is_empty(&cc))
+					goto lock_folio;
+
+				if (f2fs_all_cluster_page_ready(&cc,
+					pages, i, nr_pages, true))
+					goto lock_folio;
+
+				ret2 = f2fs_prepare_compress_overwrite(
+							inode, &pagep,
+							folio->index, &fsdata);
+				if (ret2 < 0) {
+					ret = ret2;
+					done = 1;
+					break;
+				} else if (ret2 &&
+					(!f2fs_compress_write_end(inode,
+						fsdata, folio->index, 1) ||
+					 !f2fs_all_cluster_page_ready(&cc,
+						pages, i, nr_pages,
+						false))) {
+					retry = 1;
+					break;
+				}
+			}
+#endif
+			/* give a priority to WB_SYNC threads */
+			if (atomic_read(&sbi->wb_sync_req[DATA]) &&
+					wbc->sync_mode == WB_SYNC_NONE) {
+				done = 1;
+				break;
+			}
+#ifdef CONFIG_F2FS_FS_COMPRESSION
+lock_folio:
+#endif
+			done_index = folio->index;
+retry_write:
+			folio_lock(folio);
+
+			if (unlikely(folio->mapping != mapping)) {
+continue_unlock:
+				folio_unlock(folio);
+				continue;
+			}
+
+			if (!folio_test_dirty(folio)) {
+				/* someone wrote it for us */
+				goto continue_unlock;
+			}
+
+			if (folio_test_writeback(folio)) {
+				if (wbc->sync_mode != WB_SYNC_NONE)
+					f2fs_wait_on_page_writeback(
+							&folio->page,
+							DATA, true, true);
+				else
+					goto continue_unlock;
+			}
+
+			if (!folio_clear_dirty_for_io(folio))
+				goto continue_unlock;
+
+#ifdef CONFIG_F2FS_FS_COMPRESSION
+			if (f2fs_compressed_file(inode)) {
+				folio_get(folio);
+				f2fs_compress_ctx_add_page(&cc, &folio->page);
+				continue;
+			}
+#endif
+			ret = f2fs_write_single_data_page(&folio->page,
+					&submitted, &bio, &last_block,
+					wbc, io_type, 0, true);
+			if (ret == AOP_WRITEPAGE_ACTIVATE)
+				folio_unlock(folio);
+#ifdef CONFIG_F2FS_FS_COMPRESSION
+result:
+#endif
+			nwritten += submitted;
+			wbc->nr_to_write -= submitted;
+
+			if (unlikely(ret)) {
+				/*
+				 * keep nr_to_write, since vfs uses this to
+				 * get # of written pages.
+				 */
+				if (ret == AOP_WRITEPAGE_ACTIVATE) {
+					ret = 0;
+					goto next;
+				} else if (ret == -EAGAIN) {
+					ret = 0;
+					if (wbc->sync_mode == WB_SYNC_ALL) {
+						f2fs_io_schedule_timeout(
+							DEFAULT_IO_TIMEOUT);
+						goto retry_write;
+					}
+					goto next;
+				}
+				done_index = folio->index +
+					folio_nr_pages(folio);
+				done = 1;
+				break;
+			}
+
+			if (wbc->nr_to_write <= 0 &&
+					wbc->sync_mode == WB_SYNC_NONE) {
+				done = 1;
+				break;
+			}
+next:
+			if (need_readd)
+				goto readd;
+		}
+		release_pages(pages, nr_pages);
+		cond_resched();
+	}
+#ifdef CONFIG_F2FS_FS_COMPRESSION
+	/* flush remained pages in compress cluster */
+	if (f2fs_compressed_file(inode) && !f2fs_cluster_is_empty(&cc)) {
+		ret = f2fs_write_multi_pages(&cc, &submitted, wbc, io_type);
+		nwritten += submitted;
+		wbc->nr_to_write -= submitted;
+		if (ret) {
+			done = 1;
+			retry = 0;
+		}
+	}
+	if (f2fs_compressed_file(inode))
+		f2fs_destroy_compress_ctx(&cc, false);
+#endif
+	if (retry) {
+		index = 0;
+		end = -1;
+		goto retry;
+	}
+	if (wbc->range_cyclic && !done)
+		done_index = 0;
+	if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0))
+		mapping->writeback_index = done_index;
+
+	if (nwritten)
+		f2fs_submit_merged_write_cond(F2FS_M_SB(mapping), mapping->host,
+								NULL, 0, DATA);
+	/* submit cached bio of IPU write */
+	if (bio)
+		f2fs_submit_merged_ipu_write(sbi, &bio, NULL);
+
+#ifdef CONFIG_F2FS_FS_COMPRESSION
+	if (pages != pages_local)
+		kfree(pages);
+#endif
+
+	return ret;
+}
+
+static inline bool __should_serialize_io(struct inode *inode,
+					struct writeback_control *wbc)
+{
+	/* to avoid deadlock in path of data flush */
+	if (F2FS_I(inode)->wb_task)
+		return false;
+
+	if (!S_ISREG(inode->i_mode))
+		return false;
+	if (IS_NOQUOTA(inode))
+		return false;
+
+	if (f2fs_need_compress_data(inode))
+		return true;
+	if (wbc->sync_mode != WB_SYNC_ALL)
+		return true;
+	if (get_dirty_pages(inode) >= SM_I(F2FS_I_SB(inode))->min_seq_blocks)
+		return true;
+	return false;
+}
+
+static int __f2fs_write_data_pages(struct address_space *mapping,
+						struct writeback_control *wbc,
+						enum iostat_type io_type)
+{
+	struct inode *inode = mapping->host;
+	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
+	struct blk_plug plug;
+	int ret;
+	bool locked = false;
+
+	/* deal with chardevs and other special file */
+	if (!mapping->a_ops->writepage)
+		return 0;
+
+	/* skip writing if there is no dirty page in this inode */
+	if (!get_dirty_pages(inode) && wbc->sync_mode == WB_SYNC_NONE)
+		return 0;
+
+	/* during POR, we don't need to trigger writepage at all. */
+	if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
+		goto skip_write;
+
+	if ((S_ISDIR(inode->i_mode) || IS_NOQUOTA(inode)) &&
+			wbc->sync_mode == WB_SYNC_NONE &&
+			get_dirty_pages(inode) < nr_pages_to_skip(sbi, DATA) &&
+			f2fs_available_free_memory(sbi, DIRTY_DENTS))
+		goto skip_write;
+
+	/* skip writing in file defragment preparing stage */
+	if (is_inode_flag_set(inode, FI_SKIP_WRITES))
+		goto skip_write;
+
+	trace_f2fs_writepages(mapping->host, wbc, DATA);
+
+	/* to avoid spliting IOs due to mixed WB_SYNC_ALL and WB_SYNC_NONE */
+	if (wbc->sync_mode == WB_SYNC_ALL)
+		atomic_inc(&sbi->wb_sync_req[DATA]);
+	else if (atomic_read(&sbi->wb_sync_req[DATA])) {
+		/* to avoid potential deadlock */
+		if (current->plug)
+			blk_finish_plug(current->plug);
+		goto skip_write;
+	}
+
+	if (__should_serialize_io(inode, wbc)) {
+		mutex_lock(&sbi->writepages);
+		locked = true;
+	}
+
+	blk_start_plug(&plug);
+	ret = f2fs_write_cache_pages(mapping, wbc, io_type);
+	blk_finish_plug(&plug);
+
+	if (locked)
+		mutex_unlock(&sbi->writepages);
+
+	if (wbc->sync_mode == WB_SYNC_ALL)
+		atomic_dec(&sbi->wb_sync_req[DATA]);
+	/*
+	 * if some pages were truncated, we cannot guarantee its mapping->host
+	 * to detect pending bios.
+	 */
+
+	f2fs_remove_dirty_inode(inode);
+	return ret;
+
+skip_write:
+	wbc->pages_skipped += get_dirty_pages(inode);
+	trace_f2fs_writepages(mapping->host, wbc, DATA);
+	return 0;
+}
+
+static int f2fs_write_data_pages(struct address_space *mapping,
+			    struct writeback_control *wbc)
+{
+	struct inode *inode = mapping->host;
+
+	return __f2fs_write_data_pages(mapping, wbc,
+			F2FS_I(inode)->cp_task == current ?
+			FS_CP_DATA_IO : FS_DATA_IO);
+}
+
+void f2fs_write_failed(struct inode *inode, loff_t to)
+{
+	loff_t i_size = i_size_read(inode);
+
+	if (IS_NOQUOTA(inode))
+		return;
+
+	/* In the fs-verity case, f2fs_end_enable_verity() does the truncate */
+	if (to > i_size && !f2fs_verity_in_progress(inode)) {
+		f2fs_down_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
+		filemap_invalidate_lock(inode->i_mapping);
+
+		truncate_pagecache(inode, i_size);
+		f2fs_truncate_blocks(inode, i_size, true);
+
+		filemap_invalidate_unlock(inode->i_mapping);
+		f2fs_up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
+	}
+}
+
+static int prepare_write_begin(struct f2fs_sb_info *sbi,
+			struct page *page, loff_t pos, unsigned len,
+			block_t *blk_addr, bool *node_changed)
+{
+	struct inode *inode = page->mapping->host;
+	pgoff_t index = page->index;
+	struct dnode_of_data dn;
+	struct page *ipage;
+	bool locked = false;
+	struct extent_info ei = {0, };
+	int err = 0;
+	int flag;
+
+	/*
+	 * If a whole page is being written and we already preallocated all the
+	 * blocks, then there is no need to get a block address now.
+	 */
+	if (len == PAGE_SIZE && is_inode_flag_set(inode, FI_PREALLOCATED_ALL))
+		return 0;
+
+	/* f2fs_lock_op avoids race between write CP and convert_inline_page */
+	if (f2fs_has_inline_data(inode) && pos + len > MAX_INLINE_DATA(inode))
+		flag = F2FS_GET_BLOCK_DEFAULT;
+	else
+		flag = F2FS_GET_BLOCK_PRE_AIO;
+
+	if (f2fs_has_inline_data(inode) ||
+			(pos & PAGE_MASK) >= i_size_read(inode)) {
+		f2fs_do_map_lock(sbi, flag, true);
+		locked = true;
+	}
+
+restart:
+	/* check inline_data */
+	ipage = f2fs_get_node_page(sbi, inode->i_ino);
+	if (IS_ERR(ipage)) {
+		err = PTR_ERR(ipage);
+		goto unlock_out;
+	}
+
+	set_new_dnode(&dn, inode, ipage, ipage, 0);
+
+	if (f2fs_has_inline_data(inode)) {
+		if (pos + len <= MAX_INLINE_DATA(inode)) {
+			f2fs_do_read_inline_data(page, ipage);
+			set_inode_flag(inode, FI_DATA_EXIST);
+			if (inode->i_nlink)
+				set_page_private_inline(ipage);
+		} else {
+			err = f2fs_convert_inline_page(&dn, page);
+			if (err)
+				goto out;
+			if (dn.data_blkaddr == NULL_ADDR)
+				err = f2fs_get_block(&dn, index);
+		}
+	} else if (locked) {
+		err = f2fs_get_block(&dn, index);
+	} else {
+		if (f2fs_lookup_read_extent_cache(inode, index, &ei)) {
+			dn.data_blkaddr = ei.blk + index - ei.fofs;
+		} else {
+			/* hole case */
+			err = f2fs_get_dnode_of_data(&dn, index, LOOKUP_NODE);
+			if (err || dn.data_blkaddr == NULL_ADDR) {
+				f2fs_put_dnode(&dn);
+				f2fs_do_map_lock(sbi, F2FS_GET_BLOCK_PRE_AIO,
+								true);
+				WARN_ON(flag != F2FS_GET_BLOCK_PRE_AIO);
+				locked = true;
+				goto restart;
+			}
+		}
+	}
+
+	/* convert_inline_page can make node_changed */
+	*blk_addr = dn.data_blkaddr;
+	*node_changed = dn.node_changed;
+out:
+	f2fs_put_dnode(&dn);
+unlock_out:
+	if (locked)
+		f2fs_do_map_lock(sbi, flag, false);
+	return err;
+}
+
+static int __find_data_block(struct inode *inode, pgoff_t index,
+				block_t *blk_addr)
+{
+	struct dnode_of_data dn;
+	struct page *ipage;
+	struct extent_info ei = {0, };
+	int err = 0;
+
+	ipage = f2fs_get_node_page(F2FS_I_SB(inode), inode->i_ino);
+	if (IS_ERR(ipage))
+		return PTR_ERR(ipage);
+
+	set_new_dnode(&dn, inode, ipage, ipage, 0);
+
+	if (f2fs_lookup_read_extent_cache(inode, index, &ei)) {
+		dn.data_blkaddr = ei.blk + index - ei.fofs;
+	} else {
+		/* hole case */
+		err = f2fs_get_dnode_of_data(&dn, index, LOOKUP_NODE);
+		if (err) {
+			dn.data_blkaddr = NULL_ADDR;
+			err = 0;
+		}
+	}
+	*blk_addr = dn.data_blkaddr;
+	f2fs_put_dnode(&dn);
+	return err;
+}
+
+static int __reserve_data_block(struct inode *inode, pgoff_t index,
+				block_t *blk_addr, bool *node_changed)
+{
+	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
+	struct dnode_of_data dn;
+	struct page *ipage;
+	int err = 0;
+
+	f2fs_do_map_lock(sbi, F2FS_GET_BLOCK_PRE_AIO, true);
+
+	ipage = f2fs_get_node_page(sbi, inode->i_ino);
+	if (IS_ERR(ipage)) {
+		err = PTR_ERR(ipage);
+		goto unlock_out;
+	}
+	set_new_dnode(&dn, inode, ipage, ipage, 0);
+
+	err = f2fs_get_block(&dn, index);
+
+	*blk_addr = dn.data_blkaddr;
+	*node_changed = dn.node_changed;
+	f2fs_put_dnode(&dn);
+
+unlock_out:
+	f2fs_do_map_lock(sbi, F2FS_GET_BLOCK_PRE_AIO, false);
+	return err;
+}
+
+static int prepare_atomic_write_begin(struct f2fs_sb_info *sbi,
+			struct page *page, loff_t pos, unsigned int len,
+			block_t *blk_addr, bool *node_changed)
+{
+	struct inode *inode = page->mapping->host;
+	struct inode *cow_inode = F2FS_I(inode)->cow_inode;
+	pgoff_t index = page->index;
+	int err = 0;
+	block_t ori_blk_addr = NULL_ADDR;
+
+	/* If pos is beyond the end of file, reserve a new block in COW inode */
+	if ((pos & PAGE_MASK) >= i_size_read(inode))
+		goto reserve_block;
+
+	/* Look for the block in COW inode first */
+	err = __find_data_block(cow_inode, index, blk_addr);
+	if (err)
+		return err;
+	else if (*blk_addr != NULL_ADDR)
+		return 0;
+
+	/* Look for the block in the original inode */
+	err = __find_data_block(inode, index, &ori_blk_addr);
+	if (err)
+		return err;
+
+reserve_block:
+	/* Finally, we should reserve a new block in COW inode for the update */
+	err = __reserve_data_block(cow_inode, index, blk_addr, node_changed);
+	if (err)
+		return err;
+	inc_atomic_write_cnt(inode);
+
+	if (ori_blk_addr != NULL_ADDR)
+		*blk_addr = ori_blk_addr;
+	return 0;
+}
+
+static int f2fs_write_begin(struct file *file, struct address_space *mapping,
+		loff_t pos, unsigned len, struct page **pagep, void **fsdata)
+{
+	struct inode *inode = mapping->host;
+	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
+	struct page *page = NULL;
+	pgoff_t index = ((unsigned long long) pos) >> PAGE_SHIFT;
+	bool need_balance = false;
+	block_t blkaddr = NULL_ADDR;
+	int err = 0;
+
+	trace_f2fs_write_begin(inode, pos, len);
+
+	if (!f2fs_is_checkpoint_ready(sbi)) {
+		err = -ENOSPC;
+		goto fail;
+	}
+
+	/*
+	 * We should check this at this moment to avoid deadlock on inode page
+	 * and #0 page. The locking rule for inline_data conversion should be:
+	 * lock_page(page #0) -> lock_page(inode_page)
+	 */
+	if (index != 0) {
+		err = f2fs_convert_inline_inode(inode);
+		if (err)
+			goto fail;
+	}
+
+#ifdef CONFIG_F2FS_FS_COMPRESSION
+	if (f2fs_compressed_file(inode)) {
+		int ret;
+
+		*fsdata = NULL;
+
+		if (len == PAGE_SIZE && !(f2fs_is_atomic_file(inode)))
+			goto repeat;
+
+		ret = f2fs_prepare_compress_overwrite(inode, pagep,
+							index, fsdata);
+		if (ret < 0) {
+			err = ret;
+			goto fail;
+		} else if (ret) {
+			return 0;
+		}
+	}
+#endif
+
+repeat:
+	/*
+	 * Do not use grab_cache_page_write_begin() to avoid deadlock due to
+	 * wait_for_stable_page. Will wait that below with our IO control.
+	 */
+	page = f2fs_pagecache_get_page(mapping, index,
+				FGP_LOCK | FGP_WRITE | FGP_CREAT, GFP_NOFS);
+	if (!page) {
+		err = -ENOMEM;
+		goto fail;
+	}
+
+	/* TODO: cluster can be compressed due to race with .writepage */
+
+	*pagep = page;
+
+	if (f2fs_is_atomic_file(inode))
+		err = prepare_atomic_write_begin(sbi, page, pos, len,
+					&blkaddr, &need_balance);
+	else
+		err = prepare_write_begin(sbi, page, pos, len,
+					&blkaddr, &need_balance);
+	if (err)
+		goto fail;
+
+	if (need_balance && !IS_NOQUOTA(inode) &&
+			has_not_enough_free_secs(sbi, 0, 0)) {
+		unlock_page(page);
+		f2fs_balance_fs(sbi, true);
+		lock_page(page);
+		if (page->mapping != mapping) {
+			/* The page got truncated from under us */
+			f2fs_put_page(page, 1);
+			goto repeat;
+		}
+	}
+
+	f2fs_wait_on_page_writeback(page, DATA, false, true);
+
+	if (len == PAGE_SIZE || PageUptodate(page))
+		return 0;
+
+	if (!(pos & (PAGE_SIZE - 1)) && (pos + len) >= i_size_read(inode) &&
+	    !f2fs_verity_in_progress(inode)) {
+		zero_user_segment(page, len, PAGE_SIZE);
+		return 0;
+	}
+
+	if (blkaddr == NEW_ADDR) {
+		zero_user_segment(page, 0, PAGE_SIZE);
+		SetPageUptodate(page);
+	} else {
+		if (!f2fs_is_valid_blkaddr(sbi, blkaddr,
+				DATA_GENERIC_ENHANCE_READ)) {
+			err = -EFSCORRUPTED;
+			f2fs_handle_error(sbi, ERROR_INVALID_BLKADDR);
+			goto fail;
+		}
+		err = f2fs_submit_page_read(inode, page, blkaddr, 0, true);
+		if (err)
+			goto fail;
+
+		lock_page(page);
+		if (unlikely(page->mapping != mapping)) {
+			f2fs_put_page(page, 1);
+			goto repeat;
+		}
+		if (unlikely(!PageUptodate(page))) {
+			err = -EIO;
+			goto fail;
+		}
+	}
+	return 0;
+
+fail:
+	f2fs_put_page(page, 1);
+	f2fs_write_failed(inode, pos + len);
+	return err;
+}
+
+static int f2fs_write_end(struct file *file,
+			struct address_space *mapping,
+			loff_t pos, unsigned len, unsigned copied,
+			struct page *page, void *fsdata)
+{
+	struct inode *inode = page->mapping->host;
+
+	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 (!PageUptodate(page)) {
+		if (unlikely(copied != len))
+			copied = 0;
+		else
+			SetPageUptodate(page);
+	}
+
+#ifdef CONFIG_F2FS_FS_COMPRESSION
+	/* overwrite compressed file */
+	if (f2fs_compressed_file(inode) && fsdata) {
+		f2fs_compress_write_end(inode, fsdata, page->index, copied);
+		f2fs_update_time(F2FS_I_SB(inode), REQ_TIME);
+
+		if (pos + copied > i_size_read(inode) &&
+				!f2fs_verity_in_progress(inode))
+			f2fs_i_size_write(inode, pos + copied);
+		return copied;
+	}
+#endif
+
+	if (!copied)
+		goto unlock_out;
+
+	set_page_dirty(page);
+
+	if (pos + copied > i_size_read(inode) &&
+	    !f2fs_verity_in_progress(inode)) {
+		f2fs_i_size_write(inode, pos + copied);
+		if (f2fs_is_atomic_file(inode))
+			f2fs_i_size_write(F2FS_I(inode)->cow_inode,
+					pos + copied);
+	}
+unlock_out:
+	f2fs_put_page(page, 1);
+	f2fs_update_time(F2FS_I_SB(inode), REQ_TIME);
+	return copied;
+}
+
+void f2fs_invalidate_folio(struct folio *folio, size_t offset, size_t length)
+{
+	struct inode *inode = folio->mapping->host;
+	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
+
+	if (inode->i_ino >= F2FS_ROOT_INO(sbi) &&
+				(offset || length != folio_size(folio)))
+		return;
+
+	if (folio_test_dirty(folio)) {
+		if (inode->i_ino == F2FS_META_INO(sbi)) {
+			dec_page_count(sbi, F2FS_DIRTY_META);
+		} else if (inode->i_ino == F2FS_NODE_INO(sbi)) {
+			dec_page_count(sbi, F2FS_DIRTY_NODES);
+		} else {
+			inode_dec_dirty_pages(inode);
+			f2fs_remove_dirty_inode(inode);
+		}
+	}
+
+	clear_page_private_gcing(&folio->page);
+
+	if (test_opt(sbi, COMPRESS_CACHE) &&
+			inode->i_ino == F2FS_COMPRESS_INO(sbi))
+		clear_page_private_data(&folio->page);
+
+	folio_detach_private(folio);
+}
+
+bool f2fs_release_folio(struct folio *folio, gfp_t wait)
+{
+	struct f2fs_sb_info *sbi;
+
+	/* If this is dirty folio, keep private data */
+	if (folio_test_dirty(folio))
+		return false;
+
+	sbi = F2FS_M_SB(folio->mapping);
+	if (test_opt(sbi, COMPRESS_CACHE)) {
+		struct inode *inode = folio->mapping->host;
+
+		if (inode->i_ino == F2FS_COMPRESS_INO(sbi))
+			clear_page_private_data(&folio->page);
+	}
+
+	clear_page_private_gcing(&folio->page);
+
+	folio_detach_private(folio);
+	return true;
+}
+
+static bool f2fs_dirty_data_folio(struct address_space *mapping,
+		struct folio *folio)
+{
+	struct inode *inode = mapping->host;
+
+	trace_f2fs_set_page_dirty(&folio->page, DATA);
+
+	if (!folio_test_uptodate(folio))
+		folio_mark_uptodate(folio);
+	BUG_ON(folio_test_swapcache(folio));
+
+	if (filemap_dirty_folio(mapping, folio)) {
+		f2fs_update_dirty_folio(inode, folio);
+		return true;
+	}
+	return false;
+}
+
+
+static sector_t f2fs_bmap_compress(struct inode *inode, sector_t block)
+{
+#ifdef CONFIG_F2FS_FS_COMPRESSION
+	struct dnode_of_data dn;
+	sector_t start_idx, blknr = 0;
+	int ret;
+
+	start_idx = round_down(block, F2FS_I(inode)->i_cluster_size);
+
+	set_new_dnode(&dn, inode, NULL, NULL, 0);
+	ret = f2fs_get_dnode_of_data(&dn, start_idx, LOOKUP_NODE);
+	if (ret)
+		return 0;
+
+	if (dn.data_blkaddr != COMPRESS_ADDR) {
+		dn.ofs_in_node += block - start_idx;
+		blknr = f2fs_data_blkaddr(&dn);
+		if (!__is_valid_data_blkaddr(blknr))
+			blknr = 0;
+	}
+
+	f2fs_put_dnode(&dn);
+	return blknr;
+#else
+	return 0;
+#endif
+}
+
+
+static sector_t f2fs_bmap(struct address_space *mapping, sector_t block)
+{
+	struct inode *inode = mapping->host;
+	sector_t blknr = 0;
+
+	if (f2fs_has_inline_data(inode))
+		goto out;
+
+	/* make sure allocating whole blocks */
+	if (mapping_tagged(mapping, PAGECACHE_TAG_DIRTY))
+		filemap_write_and_wait(mapping);
+
+	/* Block number less than F2FS MAX BLOCKS */
+	if (unlikely(block >= max_file_blocks(inode)))
+		goto out;
+
+	if (f2fs_compressed_file(inode)) {
+		blknr = f2fs_bmap_compress(inode, block);
+	} else {
+		struct f2fs_map_blocks map;
+
+		memset(&map, 0, sizeof(map));
+		map.m_lblk = block;
+		map.m_len = 1;
+		map.m_next_pgofs = NULL;
+		map.m_seg_type = NO_CHECK_TYPE;
+
+		if (!f2fs_map_blocks(inode, &map, 0, F2FS_GET_BLOCK_BMAP))
+			blknr = map.m_pblk;
+	}
+out:
+	trace_f2fs_bmap(inode, block, blknr);
+	return blknr;
+}
+
+#ifdef CONFIG_SWAP
+static int f2fs_migrate_blocks(struct inode *inode, block_t start_blk,
+							unsigned int blkcnt)
+{
+	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
+	unsigned int blkofs;
+	unsigned int blk_per_sec = BLKS_PER_SEC(sbi);
+	unsigned int secidx = start_blk / blk_per_sec;
+	unsigned int end_sec = secidx + blkcnt / blk_per_sec;
+	int ret = 0;
+
+	f2fs_down_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
+	filemap_invalidate_lock(inode->i_mapping);
+
+	set_inode_flag(inode, FI_ALIGNED_WRITE);
+	set_inode_flag(inode, FI_OPU_WRITE);
+
+	for (; secidx < end_sec; secidx++) {
+		f2fs_down_write(&sbi->pin_sem);
+
+		f2fs_lock_op(sbi);
+		f2fs_allocate_new_section(sbi, CURSEG_COLD_DATA_PINNED, false);
+		f2fs_unlock_op(sbi);
+
+		set_inode_flag(inode, FI_SKIP_WRITES);
+
+		for (blkofs = 0; blkofs < blk_per_sec; blkofs++) {
+			struct page *page;
+			unsigned int blkidx = secidx * blk_per_sec + blkofs;
+
+			page = f2fs_get_lock_data_page(inode, blkidx, true);
+			if (IS_ERR(page)) {
+				f2fs_up_write(&sbi->pin_sem);
+				ret = PTR_ERR(page);
+				goto done;
+			}
+
+			set_page_dirty(page);
+			f2fs_put_page(page, 1);
+		}
+
+		clear_inode_flag(inode, FI_SKIP_WRITES);
+
+		ret = filemap_fdatawrite(inode->i_mapping);
+
+		f2fs_up_write(&sbi->pin_sem);
+
+		if (ret)
+			break;
+	}
+
+done:
+	clear_inode_flag(inode, FI_SKIP_WRITES);
+	clear_inode_flag(inode, FI_OPU_WRITE);
+	clear_inode_flag(inode, FI_ALIGNED_WRITE);
+
+	filemap_invalidate_unlock(inode->i_mapping);
+	f2fs_up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
+
+	return ret;
+}
+
+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);
+	sector_t cur_lblock;
+	sector_t last_lblock;
+	sector_t pblock;
+	sector_t lowest_pblock = -1;
+	sector_t highest_pblock = 0;
+	int nr_extents = 0;
+	unsigned long nr_pblocks;
+	unsigned int blks_per_sec = BLKS_PER_SEC(sbi);
+	unsigned int sec_blks_mask = BLKS_PER_SEC(sbi) - 1;
+	unsigned int not_aligned = 0;
+	int ret = 0;
+
+	/*
+	 * Map all the blocks into the extent list.  This code doesn't try
+	 * to be very smart.
+	 */
+	cur_lblock = 0;
+	last_lblock = bytes_to_blks(inode, i_size_read(inode));
+
+	while (cur_lblock < last_lblock && cur_lblock < sis->max) {
+		struct f2fs_map_blocks map;
+retry:
+		cond_resched();
+
+		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");
+			ret = -EINVAL;
+			goto out;
+		}
+
+		pblock = map.m_pblk;
+		nr_pblocks = map.m_len;
+
+		if ((pblock - SM_I(sbi)->main_blkaddr) & sec_blks_mask ||
+				nr_pblocks & sec_blks_mask) {
+			not_aligned++;
+
+			nr_pblocks = roundup(nr_pblocks, blks_per_sec);
+			if (cur_lblock + nr_pblocks > sis->max)
+				nr_pblocks -= blks_per_sec;
+
+			if (!nr_pblocks) {
+				/* this extent is last one */
+				nr_pblocks = map.m_len;
+				f2fs_warn(sbi, "Swapfile: last extent is not aligned to section");
+				goto next;
+			}
+
+			ret = f2fs_migrate_blocks(inode, cur_lblock,
+							nr_pblocks);
+			if (ret)
+				goto out;
+			goto retry;
+		}
+next:
+		if (cur_lblock + nr_pblocks >= sis->max)
+			nr_pblocks = sis->max - cur_lblock;
+
+		if (cur_lblock) {	/* exclude the header page */
+			if (pblock < lowest_pblock)
+				lowest_pblock = pblock;
+			if (pblock + nr_pblocks - 1 > highest_pblock)
+				highest_pblock = pblock + nr_pblocks - 1;
+		}
+
+		/*
+		 * We found a PAGE_SIZE-length, PAGE_SIZE-aligned run of blocks
+		 */
+		ret = add_swap_extent(sis, cur_lblock, nr_pblocks, pblock);
+		if (ret < 0)
+			goto out;
+		nr_extents += ret;
+		cur_lblock += nr_pblocks;
+	}
+	ret = nr_extents;
+	*span = 1 + highest_pblock - lowest_pblock;
+	if (cur_lblock == 0)
+		cur_lblock = 1;	/* force Empty message */
+	sis->max = cur_lblock;
+	sis->pages = cur_lblock - 1;
+	sis->highest_bit = cur_lblock - 1;
+out:
+	if (not_aligned)
+		f2fs_warn(sbi, "Swapfile (%u) is not align to section: 1) creat(), 2) ioctl(F2FS_IOC_SET_PIN_FILE), 3) fallocate(%u * N)",
+			  not_aligned, blks_per_sec * F2FS_BLKSIZE);
+	return ret;
+}
+
+static int f2fs_swap_activate(struct swap_info_struct *sis, struct file *file,
+				sector_t *span)
+{
+	struct inode *inode = file_inode(file);
+	int ret;
+
+	if (!S_ISREG(inode->i_mode))
+		return -EINVAL;
+
+	if (f2fs_readonly(F2FS_I_SB(inode)->sb))
+		return -EROFS;
+
+	if (f2fs_lfs_mode(F2FS_I_SB(inode))) {
+		f2fs_err(F2FS_I_SB(inode),
+			"Swapfile not supported in LFS mode");
+		return -EINVAL;
+	}
+
+	ret = f2fs_convert_inline_inode(inode);
+	if (ret)
+		return ret;
+
+	if (!f2fs_disable_compressed_file(inode))
+		return -EINVAL;
+
+	f2fs_precache_extents(inode);
+
+	ret = check_swap_activate(sis, file, span);
+	if (ret < 0)
+		return ret;
+
+	stat_inc_swapfile_inode(inode);
+	set_inode_flag(inode, FI_PIN_FILE);
+	f2fs_update_time(F2FS_I_SB(inode), REQ_TIME);
+	return ret;
+}
+
+static void f2fs_swap_deactivate(struct file *file)
+{
+	struct inode *inode = file_inode(file);
+
+	stat_dec_swapfile_inode(inode);
+	clear_inode_flag(inode, FI_PIN_FILE);
+}
+#else
+static int f2fs_swap_activate(struct swap_info_struct *sis, struct file *file,
+				sector_t *span)
+{
+	return -EOPNOTSUPP;
+}
+
+static void f2fs_swap_deactivate(struct file *file)
+{
+}
+#endif
+
+const struct address_space_operations f2fs_dblock_aops = {
+	.read_folio	= f2fs_read_data_folio,
+	.readahead	= f2fs_readahead,
+	.writepage	= f2fs_write_data_page,
+	.writepages	= f2fs_write_data_pages,
+	.write_begin	= f2fs_write_begin,
+	.write_end	= f2fs_write_end,
+	.dirty_folio	= f2fs_dirty_data_folio,
+	.migrate_folio	= filemap_migrate_folio,
+	.invalidate_folio = f2fs_invalidate_folio,
+	.release_folio	= f2fs_release_folio,
+	.direct_IO	= noop_direct_IO,
+	.bmap		= f2fs_bmap,
+	.swap_activate  = f2fs_swap_activate,
+	.swap_deactivate = f2fs_swap_deactivate,
+};
+
+void f2fs_clear_page_cache_dirty_tag(struct page *page)
+{
+	struct address_space *mapping = page_mapping(page);
+	unsigned long flags;
+
+	xa_lock_irqsave(&mapping->i_pages, flags);
+	__xa_clear_mark(&mapping->i_pages, page_index(page),
+						PAGECACHE_TAG_DIRTY);
+	xa_unlock_irqrestore(&mapping->i_pages, flags);
+}
+
+int __init f2fs_init_post_read_processing(void)
+{
+	bio_post_read_ctx_cache =
+		kmem_cache_create("f2fs_bio_post_read_ctx",
+				  sizeof(struct bio_post_read_ctx), 0, 0, NULL);
+	if (!bio_post_read_ctx_cache)
+		goto fail;
+	bio_post_read_ctx_pool =
+		mempool_create_slab_pool(NUM_PREALLOC_POST_READ_CTXS,
+					 bio_post_read_ctx_cache);
+	if (!bio_post_read_ctx_pool)
+		goto fail_free_cache;
+	return 0;
+
+fail_free_cache:
+	kmem_cache_destroy(bio_post_read_ctx_cache);
+fail:
+	return -ENOMEM;
+}
+
+void f2fs_destroy_post_read_processing(void)
+{
+	mempool_destroy(bio_post_read_ctx_pool);
+	kmem_cache_destroy(bio_post_read_ctx_cache);
+}
+
+int f2fs_init_post_read_wq(struct f2fs_sb_info *sbi)
+{
+	if (!f2fs_sb_has_encrypt(sbi) &&
+		!f2fs_sb_has_verity(sbi) &&
+		!f2fs_sb_has_compression(sbi))
+		return 0;
+
+	sbi->post_read_wq = alloc_workqueue("f2fs_post_read_wq",
+						 WQ_UNBOUND | WQ_HIGHPRI,
+						 num_online_cpus());
+	if (!sbi->post_read_wq)
+		return -ENOMEM;
+	return 0;
+}
+
+void f2fs_destroy_post_read_wq(struct f2fs_sb_info *sbi)
+{
+	if (sbi->post_read_wq)
+		destroy_workqueue(sbi->post_read_wq);
+}
+
+int __init f2fs_init_bio_entry_cache(void)
+{
+	bio_entry_slab = f2fs_kmem_cache_create("f2fs_bio_entry_slab",
+			sizeof(struct bio_entry));
+	if (!bio_entry_slab)
+		return -ENOMEM;
+	return 0;
+}
+
+void f2fs_destroy_bio_entry_cache(void)
+{
+	kmem_cache_destroy(bio_entry_slab);
+}
+
+static int f2fs_iomap_begin(struct inode *inode, loff_t offset, loff_t length,
+			    unsigned int flags, struct iomap *iomap,
+			    struct iomap *srcmap)
+{
+	struct f2fs_map_blocks map = {};
+	pgoff_t next_pgofs = 0;
+	int err;
+
+	map.m_lblk = bytes_to_blks(inode, offset);
+	map.m_len = bytes_to_blks(inode, offset + length - 1) - map.m_lblk + 1;
+	map.m_next_pgofs = &next_pgofs;
+	map.m_seg_type = f2fs_rw_hint_to_seg_type(inode->i_write_hint);
+	if (flags & IOMAP_WRITE)
+		map.m_may_create = true;
+
+	err = f2fs_map_blocks(inode, &map, flags & IOMAP_WRITE,
+			      F2FS_GET_BLOCK_DIO);
+	if (err)
+		return err;
+
+	iomap->offset = blks_to_bytes(inode, map.m_lblk);
+
+	/*
+	 * When inline encryption is enabled, sometimes I/O to an encrypted file
+	 * has to be broken up to guarantee DUN contiguity.  Handle this by
+	 * limiting the length of the mapping returned.
+	 */
+	map.m_len = fscrypt_limit_io_blocks(inode, map.m_lblk, map.m_len);
+
+	/*
+	 * We should never see delalloc or compressed extents here based on
+	 * prior flushing and checks.
+	 */
+	if (WARN_ON_ONCE(map.m_pblk == NEW_ADDR))
+		return -EINVAL;
+	if (WARN_ON_ONCE(map.m_pblk == COMPRESS_ADDR))
+		return -EINVAL;
+
+	if (map.m_pblk != NULL_ADDR) {
+		iomap->length = blks_to_bytes(inode, map.m_len);
+		iomap->type = IOMAP_MAPPED;
+		iomap->flags |= IOMAP_F_MERGED;
+		iomap->bdev = map.m_bdev;
+		iomap->addr = blks_to_bytes(inode, map.m_pblk);
+	} else {
+		if (flags & IOMAP_WRITE)
+			return -ENOTBLK;
+		iomap->length = blks_to_bytes(inode, next_pgofs) -
+				iomap->offset;
+		iomap->type = IOMAP_HOLE;
+		iomap->addr = IOMAP_NULL_ADDR;
+	}
+
+	if (map.m_flags & F2FS_MAP_NEW)
+		iomap->flags |= IOMAP_F_NEW;
+	if ((inode->i_state & I_DIRTY_DATASYNC) ||
+	    offset + length > i_size_read(inode))
+		iomap->flags |= IOMAP_F_DIRTY;
+
+	return 0;
+}
+
+const struct iomap_ops f2fs_iomap_ops = {
+	.iomap_begin	= f2fs_iomap_begin,
+};