[Cluster-devel] [PATCHv3 v6.5-rc2 0/3] fs: dlm: lock cancellation feature

[Alexander Aring <aahringo@redhat.com>]

Hi,

this patch series implements lock cancellation feature. Either if a
POSIX F_SETLKW got interrupted by a signal (most common use case) or
lockd sends a F_CANCELLK request.

As I note: the current nfs handling seems to be broken. This patch
assumes that the current behaviour works. Future patches will fix the
nfs handling which seems to be broken anyway.

- Alex

changes since v3:

- drop patch "fs: dlm: ignore DLM_PLOCK_FL_CLOSE flag results", we assume
  that plock ops with DLM_PLOCK_FL_CLOSE flag set will never fail.
- Let DLM_PLOCK_OP_CANCEL to always send a reply back. This is useful when
  the op fails, e.g. older dlm_controld will return -EINVAL and we can
  implement F_CANCELLK which does not have a reference of the plock_op
  instance.
- remove DLM_PLOCK_OP_FLAG_SENT as it was only a optimization for a
  rare case. That DLM_PLOCK_OP_CANCEL sends a reply back will
  synchronize it now.
- remove DLM_PLOCK_OP_FLAG_INTERRUPTED as it's not necessary anymore
  because waiting for a reply of DLM_PLOCK_OP_CANCEL we don't need to
  handle this special case anymore.
- add "fs: dlm: remove twice newline" because I saw this while doing nfs
  lockd experiments.

Alexander Aring (3):
  fs: dlm: remove twice newline
  fs: dlm: allow to F_SETLKW getting interrupted
  fs: dlm: fix F_CANCELLK to cancel pending request

 fs/dlm/plock.c                 | 162 ++++++++++++++++++++++++++-------
 fs/gfs2/file.c                 |   9 +-
 fs/ocfs2/stack_user.c          |  13 +--
 include/linux/dlm_plock.h      |   2 +
 include/uapi/linux/dlm_plock.h |   1 +
 5 files changed, 136 insertions(+), 51 deletions(-)

-- 
2.31.1