[RFC,0/5] ceph: convert to netfs_direct_read_iter

Message

Jeffrey Layton April 7, 2022, 12:02 p.m. UTC

This patch is based on top of David Howells' netfs-lib branch [1]. That
tree adds new O_DIRECT read helpers to netfs.ko. This patchset converts
ceph to use it. With this, all of the usual xfstests pass for me on
ceph.

We should be able to rip out a large part of ceph_direct_read_write with
this set. I haven't done that here, and will probably wait until we have
converted ceph to use netfs DIO write helpers (which don't exist yet).
Once that's in place, we can just remove that function and related
infrastructure wholesale.

I'd like to get this into our testing branch for an eventual merge into
v5.19. We need it in our testing branch for a bit though.

David, in the past, I think we just based our master branch on top of
whatever branch you were feeding to -next. Around -rc3, could you
rebase netfs-lib on top of that and use that as a base for what you're
feeding into -next? Then we can just base our -next feeder branch onto
yours.

[1]: https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git/log/?h=netfs-lib

David Howells (1):
  ceph: Use the provided iterator in ceph_netfs_issue_op()

Jeff Layton (4):
  netfs: don't error out on short DIO reads
  ceph: set rsize in netfs_i_context from mount options
  ceph: enhance dout messages in issue_read codepaths
  ceph: switch to netfs_direct_read_iter

 fs/ceph/addr.c  | 55 ++++++++++++++++++++++++++++++++-----------------
 fs/ceph/file.c  |  3 +--
 fs/ceph/inode.c |  3 ++-
 fs/netfs/io.c   |  5 -----
 4 files changed, 39 insertions(+), 27 deletions(-)