[PATCH v3 09/16] iomap: export iomap_writeback_folio

[Joanne Koong <joannelkoong@gmail.com>]

From: Christoph Hellwig <hch@lst.de>

Allow fuse to use iomap_writeback_folio for folio laundering.  Note
that the caller needs to manually submit the pending writeback context.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Joanne Koong <joannelkoong@gmail.com>
---
 fs/iomap/buffered-io.c | 4 ++--
 include/linux/iomap.h  | 1 +
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
index 2973fced2a52..d7fa885b1a0c 100644
--- a/fs/iomap/buffered-io.c
+++ b/fs/iomap/buffered-io.c
@@ -1638,8 +1638,7 @@ static bool iomap_writeback_handle_eof(struct folio *folio, struct inode *inode,
 	return true;
 }
 
-static int iomap_writeback_folio(struct iomap_writepage_ctx *wpc,
-		struct folio *folio)
+int iomap_writeback_folio(struct iomap_writepage_ctx *wpc, struct folio *folio)
 {
 	struct iomap_folio_state *ifs = folio->private;
 	struct inode *inode = wpc->inode;
@@ -1721,6 +1720,7 @@ static int iomap_writeback_folio(struct iomap_writepage_ctx *wpc,
 	mapping_set_error(inode->i_mapping, error);
 	return error;
 }
+EXPORT_SYMBOL_GPL(iomap_writeback_folio);
 
 int
 iomap_writepages(struct iomap_writepage_ctx *wpc)
diff --git a/include/linux/iomap.h b/include/linux/iomap.h
index bfd178fb7cfc..7e06b3a392f8 100644
--- a/include/linux/iomap.h
+++ b/include/linux/iomap.h
@@ -465,6 +465,7 @@ void iomap_start_folio_write(struct inode *inode, struct folio *folio,
 		size_t len);
 void iomap_finish_folio_write(struct inode *inode, struct folio *folio,
 		size_t len);
+int iomap_writeback_folio(struct iomap_writepage_ctx *wpc, struct folio *folio);
 int iomap_writepages(struct iomap_writepage_ctx *wpc);
 
 /*
-- 
2.47.1