There are several call sites of extent_clear_unlock_delalloc() which
gets @locked_page = NULL.
So that extent_clear_unlock_delalloc() will try to call
process_one_page() to unlock every page even the first page is not
locked by btrfs_page_start_writer_lock().

This will trigger an ASSERT() in btrfs_subpage_end_and_test_writer() as
previously we require every page passed to
btrfs_subpage_end_and_test_writer() to be locked by
btrfs_page_start_writer_lock().

But compression path doesn't go that way.

Thankfully it's not hard to distinguish page locked by lock_page() and
btrfs_page_start_writer_lock().

So do the check in btrfs_subpage_end_and_test_writer() so now it can
handle both cases well.

Signed-off-by: Qu Wenruo <redacted>
---
 fs/btrfs/subpage.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/fs/btrfs/subpage.c b/fs/btrfs/subpage.c
index 3e0416e7e48b..7d0f4f1ce0bf 100644
--- a/fs/btrfs/subpage.c
+++ b/fs/btrfs/subpage.c

@@ -248,6 +248,17 @@ bool btrfs_subpage_end_and_test_writer(const struct btrfs_fs_info *fs_info,
 
 	btrfs_subpage_assert(fs_info, page, start, len);
 
+	/*
+	 * We have call sites passing @lock_page into
+	 * extent_clear_unlock_delalloc() for compression path.
+	 *
+	 * Those @locked_page is locked by plain lock_page(), thus its
+	 * subpage::writers is 0.
+	 * Handle them specially.
+	 */
+	if (atomic_read(&subpage->writers) == 0)
+		return true;
+
 	ASSERT(atomic_read(&subpage->writers) >= nbits);
 	return atomic_sub_and_test(nbits, &subpage->writers);
 }

-- 
2.32.0