[RFC PATCH 03/10] iomap: Do not pass iomap_writepage_ctx to iomap_add_to_ioend()

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

In preparation for calling iomap_add_to_ioend() without a writepage_ctx
available, pass in the iomap and the (current) ioend, and return the
current ioend.

Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
---
 fs/iomap/buffered-io.c | 14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
index c91259530ac1..1bf361446267 100644
--- a/fs/iomap/buffered-io.c
+++ b/fs/iomap/buffered-io.c
@@ -1299,13 +1299,11 @@ static bool iomap_can_add_to_ioend(struct iomap *iomap,
  * Test to see if we have an existing ioend structure that we could append to
  * first; otherwise finish off the current ioend and start another.
  */
-static void
-iomap_add_to_ioend(struct inode *inode, loff_t pos, struct folio *folio,
-		struct iomap_page *iop, struct iomap_writepage_ctx *wpc,
+static struct iomap_ioend *iomap_add_to_ioend(struct inode *inode,
+		loff_t pos, struct folio *folio, struct iomap_page *iop,
+		struct iomap *iomap, struct iomap_ioend *ioend,
 		struct writeback_control *wbc, struct list_head *iolist)
 {
-	struct iomap *iomap = &wpc->iomap;
-	struct iomap_ioend *ioend = wpc->ioend;
 	sector_t sector = iomap_sector(iomap, pos);
 	unsigned len = i_blocksize(inode);
 	size_t poff = offset_in_folio(folio, pos);
@@ -1314,7 +1312,6 @@ iomap_add_to_ioend(struct inode *inode, loff_t pos, struct folio *folio,
 		if (ioend)
 			list_add(&ioend->io_list, iolist);
 		ioend = iomap_alloc_ioend(inode, iomap, pos, sector, wbc);
-		wpc->ioend = ioend;
 	}
 
 	if (!bio_add_folio(ioend->io_bio, folio, len, poff)) {
@@ -1326,6 +1323,7 @@ iomap_add_to_ioend(struct inode *inode, loff_t pos, struct folio *folio,
 		atomic_add(len, &iop->write_bytes_pending);
 	ioend->io_size += len;
 	wbc_account_cgroup_owner(wbc, &folio->page, len);
+	return ioend;
 }
 
 /*
@@ -1375,8 +1373,8 @@ iomap_writepage_map(struct iomap_writepage_ctx *wpc,
 			continue;
 		if (wpc->iomap.type == IOMAP_HOLE)
 			continue;
-		iomap_add_to_ioend(inode, pos, folio, iop, wpc, wbc,
-				 &submit_list);
+		wpc->ioend = iomap_add_to_ioend(inode, pos, folio, iop,
+				&wpc->iomap, wpc->ioend, wbc, &submit_list);
 		count++;
 	}
 	if (count)
-- 
2.34.1