On Fri, Aug 2, 2019 at 4:26 AM Jeff Layton <jlayton@xxxxxxxxxx> wrote:
>
> I sent a preliminary patchset for this back in April, which relied
> on a totally hacked-up MDS patchset. Since then, Zheng has modified
> the approach somewhat to make the MDS grant the client explicit
> capabilities for asynchronous directory operations.
>
> This patchset is an updated version of the earlier set. With this,
> and the companion MDS set in play, removing a directory with a large
> number of files in it is roughly twice as fast as doing it
> synchronously.
>
> In addition this set includes some new tracepoints that allow the
> admin to better view what's happening with caps. They're mostly
> limited to unlink and cap handling here, but I expect we'll add
> more of those as time goes on.
>
> I don't think we'll want to merge this just yet, until the MDS
> support is merged. Once that goes in, and assuming we don't have
> any changes to the client/MDS interface, we should clear to do
> so.
MDS support for this is more complex than I expected. I need more time for it.
Regards
Yan, Zheng
>
> Jeff Layton (7):
> ceph: make several helper accessors take const pointers
> ceph: hold extra reference to r_parent over life of request
> ceph: register MDS request with dir inode from the get-go
> ceph: add refcounting for Fx caps
> ceph: wait for async dir ops to complete before doing synchronous dir
> ops
> ceph: new tracepoints when adding and removing caps
> ceph: add tracepoints for async and sync unlink
>
> Yan, Zheng (2):
> ceph: check inode type for CEPH_CAP_FILE_{CACHE,RD,REXTEND,LAZYIO}
> ceph: perform asynchronous unlink if we have sufficient caps
>
> fs/ceph/Makefile | 3 +-
> fs/ceph/caps.c | 88 +++++++++++++++++------
> fs/ceph/dir.c | 121 ++++++++++++++++++++++++++++++--
> fs/ceph/file.c | 4 ++
> fs/ceph/inode.c | 9 ++-
> fs/ceph/mds_client.c | 27 +++----
> fs/ceph/super.h | 28 ++++----
> fs/ceph/trace.c | 76 ++++++++++++++++++++
> fs/ceph/trace.h | 86 +++++++++++++++++++++++
> include/linux/ceph/ceph_debug.h | 1 +
> include/linux/ceph/ceph_fs.h | 9 +++
> 11 files changed, 393 insertions(+), 59 deletions(-)
> create mode 100644 fs/ceph/trace.c
> create mode 100644 fs/ceph/trace.h
>
> --
> 2.21.0
>
