From: Qu Wenruo <wqu@suse.com>
Date: Tue, 26 Jan 2021 08:33:55 +0000 (+0800)
Subject: btrfs: support subpage in btrfs_clone_extent_buffer
X-Git-Tag: v5.15.73~12227^2~92
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=92d83e94365706fa3250b0e43bdab5995ac03046;p=platform%2Fkernel%2Flinux-rpi.git

btrfs: support subpage in btrfs_clone_extent_buffer

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.

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
---

diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 969de300a95b..6b27daf62d94 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -5163,11 +5163,10 @@ 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_bit(EXTENT_BUFFER_UPTODATE, &new->bflags);
+	set_extent_buffer_uptodate(new);
 
 	return new;
 }