[PATCH v3 0/8] ref_tracker: add ability to register a debugfs file for a ref_tracker_dir

[Jeff Layton <jlayton@kernel.org>]

I had previously sent some patches to add debugfs files for the net
namespace refcount trackers, but Andrew convinced me to make this more
generic and better-integrated into the ref_tracker infrastructure.

This adds a new ref_tracker_dir_debugfs() call that subsystems can call
to finalize the name of their dir and register a debugfs file for it.
The last two patches add these calls for the netns and netdev
ref_trackers.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
---
Changes in v3:
- don't overwrite dir->name in ref_tracker_dir_debugfs
- define REF_TRACKER_NAMESZ and use it when setting name
- Link to v2: https://lore.kernel.org/r/20250415-reftrack-dbgfs-v2-0-b18c4abd122f@kernel.org

Changes in v2:
- Add patch to do %pK -> %p conversion in ref_tracker.c
- Pass in output function to pr_ostream() instead of if statement
- Widen ref_tracker_dir.name to 64 bytes to accomodate unique names
- Eliminate error handling with debugfs manipulation
- Incorporate pointer value into netdev name
- Link to v1: https://lore.kernel.org/r/20250414-reftrack-dbgfs-v1-0-f03585832203@kernel.org

---
Jeff Layton (8):
      ref_tracker: don't use %pK in pr_ostream() output
      ref_tracker: add a top level debugfs directory for ref_tracker
      ref_tracker: have callers pass output function to pr_ostream()
      ref_tracker: allow pr_ostream() to print directly to a seq_file
      ref_tracker: add ability to register a file in debugfs for a ref_tracker_dir
      ref_tracker: widen the ref_tracker_dir.name field
      net: add ref_tracker_dir_debugfs() calls for netns refcount tracking
      net: register debugfs file for net_device refcnt tracker

 include/linux/ref_tracker.h |  17 ++++-
 lib/ref_tracker.c           | 151 +++++++++++++++++++++++++++++++++++++++-----
 net/core/dev.c              |   6 +-
 net/core/net_namespace.c    |  34 +++++++++-
 4 files changed, 190 insertions(+), 18 deletions(-)
---
base-commit: 695caca9345a160ecd9645abab8e70cfe849e9ff
change-id: 20250413-reftrack-dbgfs-3767b303e2fa

Best regards,
-- 
Jeff Layton <jlayton@kernel.org>