[11/27] iomap: switch iomap_file_unshare to use iomap_iter

Commit Message

Christoph Hellwig July 19, 2021, 10:35 a.m. UTC

Switch iomap_file_unshare to use iomap_iter.

Signed-off-by: Christoph Hellwig <[e-mail]>
---
 fs/iomap/buffered-io.c | 35 ++++++++++++++++++-----------------
 1 file changed, 18 insertions(+), 17 deletions(-)

Patch

diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
index 7195e82d15775e..59781c72c278e5 100644
--- a/fs/iomap/buffered-io.c
+++ b/fs/iomap/buffered-io.c
@@ -806,10 +806,12 @@  iomap_file_buffered_write(struct kiocb *iocb, struct iov_iter *i,
 }
 EXPORT_SYMBOL_GPL(iomap_file_buffered_write);
 
-static loff_t
-iomap_unshare_actor(struct inode *inode, loff_t pos, loff_t length, void *data,
-		struct iomap *iomap, struct iomap *srcmap)
+static loff_t iomap_unshare_iter(struct iomap_iter *iter)
 {
+	struct iomap *iomap = &iter->iomap;
+	struct iomap *srcmap = iomap_iter_srcmap(iter);
+	loff_t pos = iter->pos;
+	loff_t length = iomap_length(iter);
 	long status = 0;
 	loff_t written = 0;
 
@@ -825,12 +827,12 @@  iomap_unshare_actor(struct inode *inode, loff_t pos, loff_t length, void *data,
 		unsigned long bytes = min_t(loff_t, PAGE_SIZE - offset, length);
 		struct page *page;
 
-		status = iomap_write_begin(inode, pos, bytes,
+		status = iomap_write_begin(iter->inode, pos, bytes,
 				IOMAP_WRITE_F_UNSHARE, &page, iomap, srcmap);
 		if (unlikely(status))
 			return status;
 
-		status = iomap_write_end(inode, pos, bytes, bytes, page, iomap,
+		status = iomap_write_end(iter->inode, pos, bytes, bytes, page, iomap,
 				srcmap);
 		if (WARN_ON_ONCE(status == 0))
 			return -EIO;
@@ -841,7 +843,7 @@  iomap_unshare_actor(struct inode *inode, loff_t pos, loff_t length, void *data,
 		written += status;
 		length -= status;
 
-		balance_dirty_pages_ratelimited(inode->i_mapping);
+		balance_dirty_pages_ratelimited(iter->inode->i_mapping);
 	} while (length);
 
 	return written;
@@ -851,18 +853,17 @@  int
 iomap_file_unshare(struct inode *inode, loff_t pos, loff_t len,
 		const struct iomap_ops *ops)
 {
-	loff_t ret;
-
-	while (len) {
-		ret = iomap_apply(inode, pos, len, IOMAP_WRITE, ops, NULL,
-				iomap_unshare_actor);
-		if (ret <= 0)
-			return ret;
-		pos += ret;
-		len -= ret;
-	}
+	struct iomap_iter iter = {
+		.inode		= inode,
+		.pos		= pos,
+		.len		= len,
+		.flags		= IOMAP_WRITE,
+	};
+	int ret;
 
-	return 0;
+	while ((ret = iomap_iter(&iter, ops)) > 0)
+		iter.processed = iomap_unshare_iter(&iter);
+	return ret;
 }
 EXPORT_SYMBOL_GPL(iomap_file_unshare);