btrfs: raid56: prepare rbio_bio_add_io_paddr() to support bs > ps cases

The function rbio_bio_add_io_paddr() assume each fs block can be mapped by
one page, blocking bs > ps support for raid56.

Prepare it for bs > ps cases by:

- Introduce a helper bio_add_paddrs()
  Previously we only need to add a single page to a bio for a fs block,
  but now we need to add multiple pages, this means we can fail halfway.

  In that case we need to properly revert the bio (only for its size
  though) for halfway failed cases.

- Rename rbio_add_io_paddr() to rbio_add_io_paddrs()
  And change the @paddr parameter to @paddrs[].

- Change all callers to use the updated rbio_add_io_paddrs()
  For the @paddrs pointer used for the new function, it can be grabbed
  using sector_paddrs_in_rbio() and rbio_stripe_paddrs() helpers.

Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

0 files changed, 0 insertions, 0 deletions