linux-kernel - [PATCH 0/2] netfs: Fix use of fscache with ceph

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Message-ID: <20250711151005.2956810-1-dhowells@redhat.com>
Date: Fri, 11 Jul 2025 16:09:59 +0100
From: David Howells <dhowells@...hat.com>
To: Christian Brauner <christian@...uner.io>
Cc: David Howells <dhowells@...hat.com>,
	Paulo Alcantara <pc@...guebit.com>,
	Max Kellermann <max.kellermann@...os.com>,
	Viacheslav Dubeyko <slava@...eyko.com>,
	Alex Markuze <amarkuze@...hat.com>,
	Ilya Dryomov <idryomov@...il.com>,
	netfs@...ts.linux.dev,
	linux-nfs@...r.kernel.org,
	ceph-devel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 0/2] netfs: Fix use of fscache with ceph

Hi Christian,

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.

The patches can also be found here:

	https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git/log/?h=netfs-fixes

Thanks,
David

David Howells (2):
  netfs: Fix copy-to-cache so that it performs collection with
    ceph+fscache
  netfs: Fix race between cache write completion and ALL_QUEUED being
    set

 fs/netfs/read_pgpriv2.c      |  5 +++++
 include/trace/events/netfs.h | 30 ++++++++++++++++++++++++++++++
 2 files changed, 35 insertions(+)