[PATCH v15 04/17] iomap: Convert iomap_page_create to take a folio

["Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>]

This function already assumed it was being passed a head page, so
just formalise that.

Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Reviewed-by: Darrick J. Wong <djwong@xxxxxxxxxx>
---
 fs/iomap/buffered-io.c | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
index d4870a2691f9..ec8bdc0c63df 100644
--- a/fs/iomap/buffered-io.c
+++ b/fs/iomap/buffered-io.c
@@ -42,11 +42,10 @@ static inline struct iomap_page *to_iomap_page(struct folio *folio)
 static struct bio_set iomap_ioend_bioset;
 
 static struct iomap_page *
-iomap_page_create(struct inode *inode, struct page *page)
+iomap_page_create(struct inode *inode, struct folio *folio)
 {
-	struct folio *folio = page_folio(page);
 	struct iomap_page *iop = to_iomap_page(folio);
-	unsigned int nr_blocks = i_blocks_per_page(inode, page);
+	unsigned int nr_blocks = i_blocks_per_folio(inode, folio);
 
 	if (iop || nr_blocks <= 1)
 		return iop;
@@ -54,9 +53,9 @@ iomap_page_create(struct inode *inode, struct page *page)
 	iop = kzalloc(struct_size(iop, uptodate, BITS_TO_LONGS(nr_blocks)),
 			GFP_NOFS | __GFP_NOFAIL);
 	spin_lock_init(&iop->uptodate_lock);
-	if (PageUptodate(page))
+	if (folio_test_uptodate(folio))
 		bitmap_fill(iop->uptodate, nr_blocks);
-	attach_page_private(page, iop);
+	folio_attach_private(folio, iop);
 	return iop;
 }
 
@@ -236,6 +235,7 @@ iomap_readpage_actor(struct inode *inode, loff_t pos, loff_t length, void *data,
 {
 	struct iomap_readpage_ctx *ctx = data;
 	struct page *page = ctx->cur_page;
+	struct folio *folio = page_folio(page);
 	struct iomap_page *iop;
 	bool same_page = false, is_contig = false;
 	loff_t orig_pos = pos;
@@ -249,7 +249,7 @@ iomap_readpage_actor(struct inode *inode, loff_t pos, loff_t length, void *data,
 	}
 
 	/* zero post-eof blocks as the page may be mapped */
-	iop = iomap_page_create(inode, page);
+	iop = iomap_page_create(inode, folio);
 	iomap_adjust_read_range(inode, iop, &pos, length, &poff, &plen);
 	if (plen == 0)
 		goto done;
@@ -549,7 +549,8 @@ static int
 __iomap_write_begin(struct inode *inode, loff_t pos, unsigned len, int flags,
 		struct page *page, struct iomap *srcmap)
 {
-	struct iomap_page *iop = iomap_page_create(inode, page);
+	struct folio *folio = page_folio(page);
+	struct iomap_page *iop = iomap_page_create(inode, folio);
 	loff_t block_size = i_blocksize(inode);
 	loff_t block_start = round_down(pos, block_size);
 	loff_t block_end = round_up(pos + len, block_size);
@@ -1303,7 +1304,8 @@ iomap_writepage_map(struct iomap_writepage_ctx *wpc,
 		struct writeback_control *wbc, struct inode *inode,
 		struct page *page, u64 end_offset)
 {
-	struct iomap_page *iop = iomap_page_create(inode, page);
+	struct folio *folio = page_folio(page);
+	struct iomap_page *iop = iomap_page_create(inode, folio);
 	struct iomap_ioend *ioend, *next;
 	unsigned len = i_blocksize(inode);
 	u64 file_offset; /* file offset of page */
-- 
2.30.2