Merge patch series "netfs: Fix use of fscache with ceph"

David Howells <dhowells@redhat.com> says:

Here are a couple of patches that fix the use of fscaching with ceph:

 (1) Fix the read collector to mark the write request that it creates to copy
     data to the cache with NETFS_RREQ_OFFLOAD_COLLECTION so that it will run
     the write collector on a workqueue as it's meant to run in the background
     and the app isn't going to wait for it.

 (2) Fix the read collector to wake up the copy-to-cache write request after
     it sets NETFS_RREQ_ALL_QUEUED if the write request doesn't have any
     subrequests left on it.  ALL_QUEUED indicates that there won't be any
     more subreqs coming and the collector should clean up - except that an
     event is needed to trigger that, but it only gets events from subreq
     termination and so the last event can beat us to setting ALL_QUEUED.

* patches from https://lore.kernel.org/20250711151005.2956810-1-dhowells@redhat.com:
  netfs: Fix race between cache write completion and ALL_QUEUED being set
  netfs: Fix copy-to-cache so that it performs collection with ceph+fscache

Link: https://lore.kernel.org/20250711151005.2956810-1-dhowells@redhat.com
Signed-off-by: Christian Brauner <brauner@kernel.org>