linux-kernel - [RFC PATCH 0/6] ceph: convert buffered read codepaths to new netfs API

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Date:   Fri, 22 Jan 2021 12:51:12 -0500
From:   Jeff Layton <jlayton@...nel.org>
To:     ceph-devel@...r.kernel.org
Cc:     linux-fsdevel@...r.kernel.org, dhowells@...hat.com,
        willy@...radead.org, linux-cachefs@...hat.com,
        linux-kernel@...r.kernel.org
Subject: [RFC PATCH 0/6] ceph: convert buffered read codepaths to new netfs API

This patchset coverts ceph to use the new netfs API that David Howells
has proposed [1]. It's a substantial reduction in code in the ceph layer
itself, but the main impetus is to allow the VM, filesystem and fscache
to better work together to optimize readahead on network filesystems.

I think the resulting code is also easier to understand, and should be
more maintainable as a lot of the pagecache handling is now done at the
netfs layer.

This has been lightly tested with xfstests. With fscache disabled, I saw
no regressions. With fscache enabled, I still hit some bugs down in the
fscache layer itself, but those seem to be present without this set as
well. This doesn't seem to make any of that worse.

[1]: https://lore.kernel.org/ceph-devel/1856291.1611259704@warthog.procyon.org.uk/T/#t

Jeff Layton (6):
  ceph: disable old fscache readpage handling
  ceph: rework PageFsCache handling
  ceph: fix invalidation
  ceph: convert readpage to fscache read helper
  ceph: plug write_begin into read helper
  ceph: convert ceph_readpages to ceph_readahead

 fs/ceph/Kconfig |   1 +
 fs/ceph/addr.c  | 536 +++++++++++++++++++-----------------------------
 fs/ceph/cache.c | 123 -----------
 fs/ceph/cache.h | 101 +++------
 fs/ceph/caps.c  |  10 +-
 fs/ceph/inode.c |   1 +
 6 files changed, 236 insertions(+), 536 deletions(-)

-- 
2.29.2