1 files changed, 216 insertions, 208 deletions

diff --git a/fs/nilfs2/page.c b/fs/nilfs2/page.c
index 063dd16d75b5..56c4da417b6a 100644
--- a/fs/nilfs2/page.c
+++ b/fs/nilfs2/page.c
@@ -25,21 +25,20 @@
 	(BIT(BH_Uptodate) | BIT(BH_Mapped) | BIT(BH_NILFS_Node) |	\
 	 BIT(BH_NILFS_Volatile) | BIT(BH_NILFS_Checked))
 
-static struct buffer_head *
-__nilfs_get_page_block(struct page *page, unsigned long block, pgoff_t index,
-		       int blkbits, unsigned long b_state)
+static struct buffer_head *__nilfs_get_folio_block(struct folio *folio,
+		unsigned long block, pgoff_t index, int blkbits,
+		unsigned long b_state)
 
 {
 	unsigned long first_block;
-	struct buffer_head *bh;
+	struct buffer_head *bh = folio_buffers(folio);
 
-	if (!page_has_buffers(page))
-		create_empty_buffers(page, 1 << blkbits, b_state);
+	if (!bh)
+		bh = create_empty_buffers(folio, 1 << blkbits, b_state);
 
 	first_block = (unsigned long)index << (PAGE_SHIFT - blkbits);
-	bh = nilfs_page_get_nth_block(page, block - first_block);
+	bh = get_nth_bh(bh, block - first_block);
 
-	touch_buffer(bh);
 	wait_on_buffer(bh);
 	return bh;
 }
@@ -51,19 +50,20 @@ struct buffer_head *nilfs_grab_buffer(struct inode *inode,
 {
 	int blkbits = inode->i_blkbits;
 	pgoff_t index = blkoff >> (PAGE_SHIFT - blkbits);
-	struct page *page;
+	struct folio *folio;
 	struct buffer_head *bh;
 
-	page = grab_cache_page(mapping, index);
-	if (unlikely(!page))
+	folio = filemap_grab_folio(mapping, index);
+	if (IS_ERR(folio))
 		return NULL;
 
-	bh = __nilfs_get_page_block(page, blkoff, index, blkbits, b_state);
+	bh = __nilfs_get_folio_block(folio, blkoff, index, blkbits, b_state);
 	if (unlikely(!bh)) {
-		unlock_page(page);
-		put_page(page);
+		folio_unlock(folio);
+		folio_put(folio);
 		return NULL;
 	}
+	bh->b_bdev = inode->i_sb->s_bdev;
 	return bh;
 }
 
@@ -73,20 +73,21 @@ struct buffer_head *nilfs_grab_buffer(struct inode *inode,
  */
 void nilfs_forget_buffer(struct buffer_head *bh)
 {
-	struct page *page = bh->b_page;
+	struct folio *folio = bh->b_folio;
 	const unsigned long clear_bits =
 		(BIT(BH_Uptodate) | BIT(BH_Dirty) | BIT(BH_Mapped) |
 		 BIT(BH_Async_Write) | BIT(BH_NILFS_Volatile) |
-		 BIT(BH_NILFS_Checked) | BIT(BH_NILFS_Redirected));
+		 BIT(BH_NILFS_Checked) | BIT(BH_NILFS_Redirected) |
+		 BIT(BH_Delay));
 
 	lock_buffer(bh);
 	set_mask_bits(&bh->b_state, clear_bits, 0);
-	if (nilfs_page_buffers_clean(page))
-		__nilfs_clear_page_dirty(page);
+	if (nilfs_folio_buffers_clean(folio))
+		__nilfs_clear_folio_dirty(folio);
 
 	bh->b_blocknr = -1;
-	ClearPageUptodate(page);
-	ClearPageMappedToDisk(page);
+	folio_clear_uptodate(folio);
+	folio_clear_mappedtodisk(folio);
 	unlock_buffer(bh);
 	brelse(bh);
 }
@@ -98,16 +99,16 @@ void nilfs_forget_buffer(struct buffer_head *bh)
  */
 void nilfs_copy_buffer(struct buffer_head *dbh, struct buffer_head *sbh)
 {
-	void *kaddr0, *kaddr1;
+	void *saddr, *daddr;
 	unsigned long bits;
-	struct page *spage = sbh->b_page, *dpage = dbh->b_page;
+	struct folio *sfolio = sbh->b_folio, *dfolio = dbh->b_folio;
 	struct buffer_head *bh;
 
-	kaddr0 = kmap_atomic(spage);
-	kaddr1 = kmap_atomic(dpage);
-	memcpy(kaddr1 + bh_offset(dbh), kaddr0 + bh_offset(sbh), sbh->b_size);
-	kunmap_atomic(kaddr1);
-	kunmap_atomic(kaddr0);
+	saddr = kmap_local_folio(sfolio, bh_offset(sbh));
+	daddr = kmap_local_folio(dfolio, bh_offset(dbh));
+	memcpy(daddr, saddr, sbh->b_size);
+	kunmap_local(daddr);
+	kunmap_local(saddr);
 
 	dbh->b_state = sbh->b_state & NILFS_BUFFER_INHERENT_BITS;
 	dbh->b_blocknr = sbh->b_blocknr;
@@ -121,58 +122,58 @@ void nilfs_copy_buffer(struct buffer_head *dbh, struct buffer_head *sbh)
 		unlock_buffer(bh);
 	}
 	if (bits & BIT(BH_Uptodate))
-		SetPageUptodate(dpage);
+		folio_mark_uptodate(dfolio);
 	else
-		ClearPageUptodate(dpage);
+		folio_clear_uptodate(dfolio);
 	if (bits & BIT(BH_Mapped))
-		SetPageMappedToDisk(dpage);
+		folio_set_mappedtodisk(dfolio);
 	else
-		ClearPageMappedToDisk(dpage);
+		folio_clear_mappedtodisk(dfolio);
 }
 
 /**
- * nilfs_page_buffers_clean - check if a page has dirty buffers or not.
- * @page: page to be checked
+ * nilfs_folio_buffers_clean - Check if a folio has dirty buffers or not.
+ * @folio: Folio to be checked.
  *
- * nilfs_page_buffers_clean() returns zero if the page has dirty buffers.
- * Otherwise, it returns non-zero value.
+ * Return: false if the folio has dirty buffers, true otherwise.
  */
-int nilfs_page_buffers_clean(struct page *page)
+bool nilfs_folio_buffers_clean(struct folio *folio)
 {
 	struct buffer_head *bh, *head;
 
-	bh = head = page_buffers(page);
+	bh = head = folio_buffers(folio);
 	do {
 		if (buffer_dirty(bh))
-			return 0;
+			return false;
 		bh = bh->b_this_page;
 	} while (bh != head);
-	return 1;
+	return true;
 }
 
-void nilfs_page_bug(struct page *page)
+void nilfs_folio_bug(struct folio *folio)
 {
+	struct buffer_head *bh, *head;
 	struct address_space *m;
 	unsigned long ino;
 
-	if (unlikely(!page)) {
-		printk(KERN_CRIT "NILFS_PAGE_BUG(NULL)\n");
+	if (unlikely(!folio)) {
+		printk(KERN_CRIT "NILFS_FOLIO_BUG(NULL)\n");
 		return;
 	}
 
-	m = page->mapping;
+	m = folio->mapping;
 	ino = m ? m->host->i_ino : 0;
 
-	printk(KERN_CRIT "NILFS_PAGE_BUG(%p): cnt=%d index#=%llu flags=0x%lx "
+	printk(KERN_CRIT "NILFS_FOLIO_BUG(%p): cnt=%d index#=%llu flags=0x%lx "
 	       "mapping=%p ino=%lu\n",
-	       page, page_ref_count(page),
-	       (unsigned long long)page->index, page->flags, m, ino);
+	       folio, folio_ref_count(folio),
+	       (unsigned long long)folio->index, folio->flags.f, m, ino);
 
-	if (page_has_buffers(page)) {
-		struct buffer_head *bh, *head;
+	head = folio_buffers(folio);
+	if (head) {
 		int i = 0;
 
-		bh = head = page_buffers(page);
+		bh = head;
 		do {
 			printk(KERN_CRIT
 			       " BH[%d] %p: cnt=%d block#=%llu state=0x%lx\n",
@@ -184,30 +185,32 @@ void nilfs_page_bug(struct page *page)
 }
 
 /**
- * nilfs_copy_page -- copy the page with buffers
- * @dst: destination page
- * @src: source page
- * @copy_dirty: flag whether to copy dirty states on the page's buffer heads.
+ * nilfs_copy_folio -- copy the folio with buffers
+ * @dst: destination folio
+ * @src: source folio
+ * @copy_dirty: flag whether to copy dirty states on the folio's buffer heads.
  *
- * This function is for both data pages and btnode pages.  The dirty flag
- * should be treated by caller.  The page must not be under i/o.
- * Both src and dst page must be locked
+ * This function is for both data folios and btnode folios.  The dirty flag
+ * should be treated by caller.  The folio must not be under i/o.
+ * Both src and dst folio must be locked
  */
-static void nilfs_copy_page(struct page *dst, struct page *src, int copy_dirty)
+static void nilfs_copy_folio(struct folio *dst, struct folio *src,
+		bool copy_dirty)
 {
 	struct buffer_head *dbh, *dbufs, *sbh;
 	unsigned long mask = NILFS_BUFFER_INHERENT_BITS;
 
-	BUG_ON(PageWriteback(dst));
+	BUG_ON(folio_test_writeback(dst));
 
-	sbh = page_buffers(src);
-	if (!page_has_buffers(dst))
-		create_empty_buffers(dst, sbh->b_size, 0);
+	sbh = folio_buffers(src);
+	dbh = folio_buffers(dst);
+	if (!dbh)
+		dbh = create_empty_buffers(dst, sbh->b_size, 0);
 
 	if (copy_dirty)
 		mask |= BIT(BH_Dirty);
 
-	dbh = dbufs = page_buffers(dst);
+	dbufs = dbh;
 	do {
 		lock_buffer(sbh);
 		lock_buffer(dbh);
@@ -218,16 +221,16 @@ static void nilfs_copy_page(struct page *dst, struct page *src, int copy_dirty)
 		dbh = dbh->b_this_page;
 	} while (dbh != dbufs);
 
-	copy_highpage(dst, src);
+	folio_copy(dst, src);
 
-	if (PageUptodate(src) && !PageUptodate(dst))
-		SetPageUptodate(dst);
-	else if (!PageUptodate(src) && PageUptodate(dst))
-		ClearPageUptodate(dst);
-	if (PageMappedToDisk(src) && !PageMappedToDisk(dst))
-		SetPageMappedToDisk(dst);
-	else if (!PageMappedToDisk(src) && PageMappedToDisk(dst))
-		ClearPageMappedToDisk(dst);
+	if (folio_test_uptodate(src) && !folio_test_uptodate(dst))
+		folio_mark_uptodate(dst);
+	else if (!folio_test_uptodate(src) && folio_test_uptodate(dst))
+		folio_clear_uptodate(dst);
+	if (folio_test_mappedtodisk(src) && !folio_test_mappedtodisk(dst))
+		folio_set_mappedtodisk(dst);
+	else if (!folio_test_mappedtodisk(src) && folio_test_mappedtodisk(dst))
+		folio_clear_mappedtodisk(dst);
 
 	do {
 		unlock_buffer(sbh);
@@ -240,42 +243,43 @@ static void nilfs_copy_page(struct page *dst, struct page *src, int copy_dirty)
 int nilfs_copy_dirty_pages(struct address_space *dmap,
 			   struct address_space *smap)
 {
-	struct pagevec pvec;
+	struct folio_batch fbatch;
 	unsigned int i;
 	pgoff_t index = 0;
 	int err = 0;
 
-	pagevec_init(&pvec);
+	folio_batch_init(&fbatch);
 repeat:
-	if (!pagevec_lookup_tag(&pvec, smap, &index, PAGECACHE_TAG_DIRTY))
+	if (!filemap_get_folios_tag(smap, &index, (pgoff_t)-1,
+				PAGECACHE_TAG_DIRTY, &fbatch))
 		return 0;
 
-	for (i = 0; i < pagevec_count(&pvec); i++) {
-		struct page *page = pvec.pages[i], *dpage;
+	for (i = 0; i < folio_batch_count(&fbatch); i++) {
+		struct folio *folio = fbatch.folios[i], *dfolio;
 
-		lock_page(page);
-		if (unlikely(!PageDirty(page)))
-			NILFS_PAGE_BUG(page, "inconsistent dirty state");
+		folio_lock(folio);
+		if (unlikely(!folio_test_dirty(folio)))
+			NILFS_FOLIO_BUG(folio, "inconsistent dirty state");
 
-		dpage = grab_cache_page(dmap, page->index);
-		if (unlikely(!dpage)) {
+		dfolio = filemap_grab_folio(dmap, folio->index);
+		if (IS_ERR(dfolio)) {
 			/* No empty page is added to the page cache */
-			err = -ENOMEM;
-			unlock_page(page);
+			folio_unlock(folio);
+			err = PTR_ERR(dfolio);
 			break;
 		}
-		if (unlikely(!page_has_buffers(page)))
-			NILFS_PAGE_BUG(page,
+		if (unlikely(!folio_buffers(folio)))
+			NILFS_FOLIO_BUG(folio,
 				       "found empty page in dat page cache");
 
-		nilfs_copy_page(dpage, page, 1);
-		__set_page_dirty_nobuffers(dpage);
+		nilfs_copy_folio(dfolio, folio, true);
+		filemap_dirty_folio(folio_mapping(dfolio), dfolio);
 
-		unlock_page(dpage);
-		put_page(dpage);
-		unlock_page(page);
+		folio_unlock(dfolio);
+		folio_put(dfolio);
+		folio_unlock(folio);
 	}
-	pagevec_release(&pvec);
+	folio_batch_release(&fbatch);
 	cond_resched();
 
 	if (likely(!err))
@@ -294,57 +298,57 @@ repeat:
 void nilfs_copy_back_pages(struct address_space *dmap,
 			   struct address_space *smap)
 {
-	struct pagevec pvec;
+	struct folio_batch fbatch;
 	unsigned int i, n;
-	pgoff_t index = 0;
+	pgoff_t start = 0;
 
-	pagevec_init(&pvec);
+	folio_batch_init(&fbatch);
 repeat:
-	n = pagevec_lookup(&pvec, smap, &index);
+	n = filemap_get_folios(smap, &start, ~0UL, &fbatch);
 	if (!n)
 		return;
 
-	for (i = 0; i < pagevec_count(&pvec); i++) {
-		struct page *page = pvec.pages[i], *dpage;
-		pgoff_t offset = page->index;
-
-		lock_page(page);
-		dpage = find_lock_page(dmap, offset);
-		if (dpage) {
-			/* overwrite existing page in the destination cache */
-			WARN_ON(PageDirty(dpage));
-			nilfs_copy_page(dpage, page, 0);
-			unlock_page(dpage);
-			put_page(dpage);
-			/* Do we not need to remove page from smap here? */
+	for (i = 0; i < folio_batch_count(&fbatch); i++) {
+		struct folio *folio = fbatch.folios[i], *dfolio;
+		pgoff_t index = folio->index;
+
+		folio_lock(folio);
+		dfolio = filemap_lock_folio(dmap, index);
+		if (!IS_ERR(dfolio)) {
+			/* overwrite existing folio in the destination cache */
+			WARN_ON(folio_test_dirty(dfolio));
+			nilfs_copy_folio(dfolio, folio, false);
+			folio_unlock(dfolio);
+			folio_put(dfolio);
+			/* Do we not need to remove folio from smap here? */
 		} else {
-			struct page *p;
+			struct folio *f;
 
-			/* move the page to the destination cache */
+			/* move the folio to the destination cache */
 			xa_lock_irq(&smap->i_pages);
-			p = __xa_erase(&smap->i_pages, offset);
-			WARN_ON(page != p);
+			f = __xa_erase(&smap->i_pages, index);
+			WARN_ON(folio != f);
 			smap->nrpages--;
 			xa_unlock_irq(&smap->i_pages);
 
 			xa_lock_irq(&dmap->i_pages);
-			p = __xa_store(&dmap->i_pages, offset, page, GFP_NOFS);
-			if (unlikely(p)) {
+			f = __xa_store(&dmap->i_pages, index, folio, GFP_NOFS);
+			if (unlikely(f)) {
 				/* Probably -ENOMEM */
-				page->mapping = NULL;
-				put_page(page);
+				folio->mapping = NULL;
+				folio_put(folio);
 			} else {
-				page->mapping = dmap;
+				folio->mapping = dmap;
 				dmap->nrpages++;
-				if (PageDirty(page))
-					__xa_set_mark(&dmap->i_pages, offset,
+				if (folio_test_dirty(folio))
+					__xa_set_mark(&dmap->i_pages, index,
 							PAGECACHE_TAG_DIRTY);
 			}
 			xa_unlock_irq(&dmap->i_pages);
 		}
-		unlock_page(page);
+		folio_unlock(folio);
 	}
-	pagevec_release(&pvec);
+	folio_batch_release(&fbatch);
 	cond_resched();
 
 	goto repeat;
@@ -353,80 +357,101 @@ repeat:
 /**
  * nilfs_clear_dirty_pages - discard dirty pages in address space
  * @mapping: address space with dirty pages for discarding
- * @silent: suppress [true] or print [false] warning messages
  */
-void nilfs_clear_dirty_pages(struct address_space *mapping, bool silent)
+void nilfs_clear_dirty_pages(struct address_space *mapping)
 {
-	struct pagevec pvec;
+	struct folio_batch fbatch;
 	unsigned int i;
 	pgoff_t index = 0;
 
-	pagevec_init(&pvec);
+	folio_batch_init(&fbatch);
+
+	while (filemap_get_folios_tag(mapping, &index, (pgoff_t)-1,
+				PAGECACHE_TAG_DIRTY, &fbatch)) {
+		for (i = 0; i < folio_batch_count(&fbatch); i++) {
+			struct folio *folio = fbatch.folios[i];
 
-	while (pagevec_lookup_tag(&pvec, mapping, &index,
-					PAGECACHE_TAG_DIRTY)) {
-		for (i = 0; i < pagevec_count(&pvec); i++) {
-			struct page *page = pvec.pages[i];
+			folio_lock(folio);
 
-			lock_page(page);
-			nilfs_clear_dirty_page(page, silent);
-			unlock_page(page);
+			/*
+			 * This folio may have been removed from the address
+			 * space by truncation or invalidation when the lock
+			 * was acquired.  Skip processing in that case.
+			 */
+			if (likely(folio->mapping == mapping))
+				nilfs_clear_folio_dirty(folio);
+
+			folio_unlock(folio);
 		}
-		pagevec_release(&pvec);
+		folio_batch_release(&fbatch);
 		cond_resched();
 	}
 }
 
 /**
- * nilfs_clear_dirty_page - discard dirty page
- * @page: dirty page that will be discarded
- * @silent: suppress [true] or print [false] warning messages
+ * nilfs_clear_folio_dirty - discard dirty folio
+ * @folio: dirty folio that will be discarded
+ *
+ * nilfs_clear_folio_dirty() clears working states including dirty state for
+ * the folio and its buffers.  If the folio has buffers, clear only if it is
+ * confirmed that none of the buffer heads are busy (none have valid
+ * references and none are locked).
  */
-void nilfs_clear_dirty_page(struct page *page, bool silent)
+void nilfs_clear_folio_dirty(struct folio *folio)
 {
-	struct inode *inode = page->mapping->host;
-	struct super_block *sb = inode->i_sb;
-
-	BUG_ON(!PageLocked(page));
-
-	if (!silent)
-		nilfs_warn(sb, "discard dirty page: offset=%lld, ino=%lu",
-			   page_offset(page), inode->i_ino);
+	struct buffer_head *bh, *head;
 
-	ClearPageUptodate(page);
-	ClearPageMappedToDisk(page);
+	BUG_ON(!folio_test_locked(folio));
 
-	if (page_has_buffers(page)) {
-		struct buffer_head *bh, *head;
+	head = folio_buffers(folio);
+	if (head) {
 		const unsigned long clear_bits =
 			(BIT(BH_Uptodate) | BIT(BH_Dirty) | BIT(BH_Mapped) |
 			 BIT(BH_Async_Write) | BIT(BH_NILFS_Volatile) |
-			 BIT(BH_NILFS_Checked) | BIT(BH_NILFS_Redirected));
+			 BIT(BH_NILFS_Checked) | BIT(BH_NILFS_Redirected) |
+			 BIT(BH_Delay));
+		bool busy, invalidated = false;
 
-		bh = head = page_buffers(page);
+recheck_buffers:
+		busy = false;
+		bh = head;
 		do {
-			lock_buffer(bh);
-			if (!silent)
-				nilfs_warn(sb,
-					   "discard dirty block: blocknr=%llu, size=%zu",
-					   (u64)bh->b_blocknr, bh->b_size);
+			if (atomic_read(&bh->b_count) | buffer_locked(bh)) {
+				busy = true;
+				break;
+			}
+		} while (bh = bh->b_this_page, bh != head);
 
+		if (busy) {
+			if (invalidated)
+				return;
+			invalidate_bh_lrus();
+			invalidated = true;
+			goto recheck_buffers;
+		}
+
+		bh = head;
+		do {
+			lock_buffer(bh);
 			set_mask_bits(&bh->b_state, clear_bits, 0);
 			unlock_buffer(bh);
 		} while (bh = bh->b_this_page, bh != head);
 	}
 
-	__nilfs_clear_page_dirty(page);
+	folio_clear_uptodate(folio);
+	folio_clear_mappedtodisk(folio);
+	folio_clear_checked(folio);
+	__nilfs_clear_folio_dirty(folio);
 }
 
-unsigned int nilfs_page_count_clean_buffers(struct page *page,
+unsigned int nilfs_page_count_clean_buffers(struct folio *folio,
 					    unsigned int from, unsigned int to)
 {
 	unsigned int block_start, block_end;
 	struct buffer_head *bh, *head;
 	unsigned int nc = 0;
 
-	for (bh = head = page_buffers(page), block_start = 0;
+	for (bh = head = folio_buffers(folio), block_start = 0;
 	     bh != head || !block_start;
 	     block_start = block_end, bh = bh->b_this_page) {
 		block_end = block_start + bh->b_size;
@@ -436,42 +461,33 @@ unsigned int nilfs_page_count_clean_buffers(struct page *page,
 	return nc;
 }
 
-void nilfs_mapping_init(struct address_space *mapping, struct inode *inode)
-{
-	mapping->host = inode;
-	mapping->flags = 0;
-	mapping_set_gfp_mask(mapping, GFP_NOFS);
-	mapping->private_data = NULL;
-	mapping->a_ops = &empty_aops;
-}
-
 /*
  * NILFS2 needs clear_page_dirty() in the following two cases:
  *
- * 1) For B-tree node pages and data pages of the dat/gcdat, NILFS2 clears
- *    page dirty flags when it copies back pages from the shadow cache
- *    (gcdat->{i_mapping,i_btnode_cache}) to its original cache
- *    (dat->{i_mapping,i_btnode_cache}).
+ * 1) For B-tree node pages and data pages of DAT file, NILFS2 clears dirty
+ *    flag of pages when it copies back pages from shadow cache to the
+ *    original cache.
  *
  * 2) Some B-tree operations like insertion or deletion may dispose buffers
  *    in dirty state, and this needs to cancel the dirty state of their pages.
  */
-int __nilfs_clear_page_dirty(struct page *page)
+void __nilfs_clear_folio_dirty(struct folio *folio)
 {
-	struct address_space *mapping = page->mapping;
+	struct address_space *mapping = folio->mapping;
 
 	if (mapping) {
 		xa_lock_irq(&mapping->i_pages);
-		if (test_bit(PG_dirty, &page->flags)) {
-			__xa_clear_mark(&mapping->i_pages, page_index(page),
+		if (folio_test_dirty(folio)) {
+			__xa_clear_mark(&mapping->i_pages, folio->index,
 					     PAGECACHE_TAG_DIRTY);
 			xa_unlock_irq(&mapping->i_pages);
-			return clear_page_dirty_for_io(page);
+			folio_clear_dirty_for_io(folio);
+			return;
 		}
 		xa_unlock_irq(&mapping->i_pages);
-		return 0;
+		return;
 	}
-	return TestClearPageDirty(page);
+	folio_clear_dirty(folio);
 }
 
 /**
@@ -483,48 +499,44 @@ int __nilfs_clear_page_dirty(struct page *page)
  * This function searches an extent of buffers marked "delayed" which
  * starts from a block offset equal to or larger than @start_blk.  If
  * such an extent was found, this will store the start offset in
- * @blkoff and return its length in blocks.  Otherwise, zero is
- * returned.
+ * @blkoff and return its length in blocks.
+ *
+ * Return: Length in blocks of found extent, 0 otherwise.
  */
 unsigned long nilfs_find_uncommitted_extent(struct inode *inode,
 					    sector_t start_blk,
 					    sector_t *blkoff)
 {
-	unsigned int i;
+	unsigned int i, nr_folios;
 	pgoff_t index;
-	unsigned int nblocks_in_page;
 	unsigned long length = 0;
-	sector_t b;
-	struct pagevec pvec;
-	struct page *page;
+	struct folio_batch fbatch;
+	struct folio *folio;
 
 	if (inode->i_mapping->nrpages == 0)
 		return 0;
 
 	index = start_blk >> (PAGE_SHIFT - inode->i_blkbits);
-	nblocks_in_page = 1U << (PAGE_SHIFT - inode->i_blkbits);
 
-	pagevec_init(&pvec);
+	folio_batch_init(&fbatch);
 
 repeat:
-	pvec.nr = find_get_pages_contig(inode->i_mapping, index, PAGEVEC_SIZE,
-					pvec.pages);
-	if (pvec.nr == 0)
+	nr_folios = filemap_get_folios_contig(inode->i_mapping, &index, ULONG_MAX,
+			&fbatch);
+	if (nr_folios == 0)
 		return length;
 
-	if (length > 0 && pvec.pages[0]->index > index)
-		goto out;
-
-	b = pvec.pages[0]->index << (PAGE_SHIFT - inode->i_blkbits);
 	i = 0;
 	do {
-		page = pvec.pages[i];
+		folio = fbatch.folios[i];
 
-		lock_page(page);
-		if (page_has_buffers(page)) {
+		folio_lock(folio);
+		if (folio_buffers(folio)) {
 			struct buffer_head *bh, *head;
+			sector_t b;
 
-			bh = head = page_buffers(page);
+			b = folio->index << (PAGE_SHIFT - inode->i_blkbits);
+			bh = head = folio_buffers(folio);
 			do {
 				if (b < start_blk)
 					continue;
@@ -539,21 +551,17 @@ repeat:
 		} else {
 			if (length > 0)
 				goto out_locked;
-
-			b += nblocks_in_page;
 		}
-		unlock_page(page);
+		folio_unlock(folio);
 
-	} while (++i < pagevec_count(&pvec));
+	} while (++i < nr_folios);
 
-	index = page->index + 1;
-	pagevec_release(&pvec);
+	folio_batch_release(&fbatch);
 	cond_resched();
 	goto repeat;
 
 out_locked:
-	unlock_page(page);
-out:
-	pagevec_release(&pvec);
+	folio_unlock(folio);
+	folio_batch_release(&fbatch);
 	return length;
 }