btrfs: allow folios to be released while ordered extent is finishing

btrfs: allow folios to be released while ordered extent is finishing

When the release_folio callback (from struct address_space_operations) is
invoked we don't allow the folio to be released if its range is currently
locked in the inode's io_tree, as it may indicate the folio may be needed
by the task that locked the range.

However if the range is locked because an ordered extent is finishing,
then we can safely allow the folio to be released because ordered extent
completion doesn't need to use the folio at all.

When we are under memory pressure, the kernel starts writeback of dirty
pages (folios) with the goal of releasing the pages from the page cache
after writeback completes, however this often is not possible on btrfs
because:

  * Once the writeback completes we queue the ordered extent completion;

  * Once the ordered extent completion starts, we lock the range in the
    inode's io_tree (at btrfs_finish_one_ordered());

  * If the release_folio callback is called while the folio's range is
    locked in the inode's io_tree, we don't allow the folio to be
    released, so the kernel has to try to release memory elsewhere,
    which may result in triggering more writeback or releasing other
    pages from the page cache which may be more useful to have around
    for applications.

In contrast, when the release_folio callback is invoked after writeback
finishes and before ordered extent completion starts or locks the range,
we allow the folio to be released, as well as when the release_folio
callback is invoked after ordered extent completion unlocks the range.

Improve on this by detecting if the range is locked for ordered extent
completion and if it is, allow the folio to be released. This detection
is achieved by adding a new extent flag in the io_tree that is set when
the range is locked during ordered extent completion.

Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>