btrfs: lzo: introduce lzo_compress_bio() helper

The new helper has the following enhancements against the existing
lzo_compress_folios()

- Much smaller parameter list

  No more shared IN/OUT members, no need to pre-allocate a
  compressed_folios[] array.

  Just a workspace list header and a compressed_bio pointer.

  Everything else can be fetched from that @cb pointer.

- Read-to-be-submitted compressed bio

  Although the caller still needs to do some common works like
  rounding up and zeroing the tailing part of the last fs block.

Some workloads are specific to lZO that is not needed with other
multi-run compression interfaces:

- Need to write a LZO header or segment header

  Use the new write_and_queue_folio() helper to do the bio_add_folio()
  call and folio switching.

- Need to update the LZO header after compression is done

  Use bio_first_folio_all() to grab the first folio and update the header.

- Extra corner case of error handling

  This can happen when we have queued part of a folio and hit an error.
  In that case those folios will be released by the bio.
  Thus we can only release the folio that has no queued part.

Reviewed-by: Boris Burkov <boris@bur.io>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

0 files changed, 0 insertions, 0 deletions