[PATCH 12/12] fuse: use direct_write_fallback

[Christoph Hellwig <hch@lst.de>]

Use the generic direct_write_fallback helper instead of duplicating the
logic.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
---
 fs/fuse/file.c | 24 ++----------------------
 1 file changed, 2 insertions(+), 22 deletions(-)

diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index b4e272a65fdd25..3a7c7d7181ccb9 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -1340,7 +1340,6 @@ static ssize_t fuse_cache_write_iter(struct kiocb *iocb, struct iov_iter *from)
 	struct file *file = iocb->ki_filp;
 	struct address_space *mapping = file->f_mapping;
 	ssize_t written = 0;
-	ssize_t written_buffered = 0;
 	struct inode *inode = mapping->host;
 	ssize_t err;
 	struct fuse_conn *fc = get_fuse_conn(inode);
@@ -1377,30 +1376,11 @@ static ssize_t fuse_cache_write_iter(struct kiocb *iocb, struct iov_iter *from)
 		goto out;
 
 	if (iocb->ki_flags & IOCB_DIRECT) {
-		loff_t pos, endbyte;
-
 		written = generic_file_direct_write(iocb, from);
 		if (written < 0 || !iov_iter_count(from))
 			goto out;
-
-		written_buffered = fuse_perform_write(iocb, from);
-		if (written_buffered < 0) {
-			err = written_buffered;
-			goto out;
-		}
-		pos = iocb->ki_pos - written_buffered;
-		endbyte = iocb->ki_pos - 1;
-
-		err = filemap_write_and_wait_range(file->f_mapping, pos,
-						   endbyte);
-		if (err)
-			goto out;
-
-		invalidate_mapping_pages(file->f_mapping,
-					 pos >> PAGE_SHIFT,
-					 endbyte >> PAGE_SHIFT);
-
-		written += written_buffered;
+		written = direct_write_fallback(iocb, from, written,
+				fuse_perform_write(iocb, from));
 	} else {
 		written = fuse_perform_write(iocb, from);
 	}
-- 
2.39.2