Merge patch series "netfs: Miscellaneous fixes"

David Howells <dhowells@redhat.com> says:

Here are some miscellaneous fixes and changes for netfslib:

 (1) Fix the collection of results during a pause in transmission.

 (2) Call ->invalidate_cache() only if provided.

 (3) Fix the rolling buffer to not hammer atomic bit clears when loading
     from readahead.

 (4) Fix netfs_unbuffered_read() to return ssize_t.

* patches from https://lore.kernel.org/r/20250314164201.1993231-1-dhowells@redhat.com:
  netfs: Fix netfs_unbuffered_read() to return ssize_t rather than int
  netfs: Fix rolling_buffer_load_from_ra() to not clear mark bits
  netfs: Call `invalidate_cache` only if implemented
  netfs: Fix collection of results during pause when collection offloaded

Link: https://lore.kernel.org/r/20250314164201.1993231-1-dhowells@redhat.com
Signed-off-by: Christian Brauner <brauner@kernel.org>