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 <[email protected]>
---
 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 66e70b263343..194cb8b63216 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -5106,7 +5106,6 @@ 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++) {
@@ -5124,11 +5123,10 @@ 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;
 }
-- 
2.29.2

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