[PATCH v4 11/18] btrfs: make btrfs_clone_extent_buffer() to be subpage compatible

[Qu Wenruo <wqu@suse.com>]

For btrfs_clone_extent_buffer(), it's mostly the same code of
__alloc_dummy_extent_buffer(), except it has extra page copy.

So to make it subpage compatible, we only need to:
- Call set_extent_buffer_uptodate() instead of SetPageUptodate()
  This will set correct uptodate bit for subpage and regular sector size
  cases.

Since we're calling set_extent_buffer_uptodate() which will also set
EXTENT_BUFFER_UPTODATE bit, we don't need to manually set that bit
either.

Signed-off-by: Qu Wenruo <wqu@suse.com>
---
 fs/btrfs/extent_io.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index c2459cf56950..74a37eec921f 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -5164,7 +5164,6 @@ struct extent_buffer *btrfs_clone_extent_buffer(const struct extent_buffer *src)
 	if (new == NULL)
 		return NULL;
 
-	set_bit(EXTENT_BUFFER_UPTODATE, &new->bflags);
 	set_bit(EXTENT_BUFFER_UNMAPPED, &new->bflags);
 
 	for (i = 0; i < num_pages; i++) {
@@ -5182,11 +5181,10 @@ struct extent_buffer *btrfs_clone_extent_buffer(const struct extent_buffer *src)
 			return NULL;
 		}
 		WARN_ON(PageDirty(p));
-		SetPageUptodate(p);
 		new->pages[i] = p;
 		copy_page(page_address(p), page_address(src->pages[i]));
 	}
-
+	set_extent_buffer_uptodate(new);
 
 	return new;
 }
-- 
2.30.0