[5/6] iomap: advance the iter directly on unshare range

Commit Message

Brian Foster Dec. 13, 2024, 2:36 p.m. UTC

Modify unshare range to advance the iter directly. Replace the local
pos and length calculations with direct advances and loop based on
iter state instead.

Signed-off-by: Brian Foster <[e-mail]>
---
 fs/iomap/buffered-io.c | 16 ++++++----------
 1 file changed, 6 insertions(+), 10 deletions(-)

Patch

diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
index 3ece0bee803d..5e33e52eff15 100644
--- a/fs/iomap/buffered-io.c
+++ b/fs/iomap/buffered-io.c
@@ -1268,18 +1268,16 @@  EXPORT_SYMBOL_GPL(iomap_write_delalloc_release);
 static loff_t iomap_unshare_iter(struct iomap_iter *iter)
 {
 	struct iomap *iomap = &iter->iomap;
-	loff_t pos = iter->pos;
-	loff_t length = iomap_length(iter);
-	loff_t written = 0;
 
 	if (!iomap_want_unshare_iter(iter))
-		return length;
+		return iomap_length(iter);
 
 	do {
 		struct folio *folio;
 		int status;
 		size_t offset;
-		size_t bytes = min_t(u64, SIZE_MAX, length);
+		size_t bytes = min_t(u64, SIZE_MAX, iomap_length(iter));
+		loff_t pos = iter->pos;
 		bool ret;
 
 		status = iomap_write_begin(iter, pos, bytes, &folio);
@@ -1299,14 +1297,12 @@  static loff_t iomap_unshare_iter(struct iomap_iter *iter)
 
 		cond_resched();
 
-		pos += bytes;
-		written += bytes;
-		length -= bytes;
+		iomap_iter_advance(iter, bytes);
 
 		balance_dirty_pages_ratelimited(iter->inode->i_mapping);
-	} while (length > 0);
+	} while (iomap_length(iter) > 0);
 
-	return written;
+	return 0;
 }
 
 int