[BUG]
When running subpage preparation patches on x86, btrfs/125 will hang
forever with one ordered extent never finished.

[CAUSE]
The test case btrfs/125 itself will always fail as the fix is never merged.

When the test fails at balance, btrfs needs to cleanup the ordered
extent in btrfs_cleanup_ordered_extents() for data reloc inode.

The problem is in the sequence how we cleanup the page Order bit.

Currently it works like:

  btrfs_cleanup_ordered_extents()
  |- find_get_page();
  |- btrfs_page_clear_ordered(page);
  |  Now the page doesn't have Ordered bit anymore.
  |  !!! This also includes the first (locked) page !!!
  |
  |- offset += PAGE_SIZE
  |  This is to skip the first page
  |- __endio_write_update_ordered()
     |- btrfs_mark_ordered_io_finished(NULL)
        Except the first page, all ordered extents are finished.

Then the locked page is cleaned up in __extent_writepage():

  __extent_writepage()
  |- If (PageError(page))
  |- end_extent_writepage()
     |- btrfs_mark_ordered_io_finished(page)
        |- if (btrfs_test_page_ordered(page))
        |-  !!! The page gets skipped !!!
            The ordered extent is not decreased as the page doesn't
            have ordered bit anymore.

This leaves the ordered extent with bytes_left == sectorsize, thus never
finish.

[FIX]
The fix is to ensure we never clear page Ordered bit without running the
ordered extent accounting.

Here we choose to skip the locked page in
btrfs_cleanup_ordered_extents() so that later end_extent_writepage() can
properly finish the ordered extent.
Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>