[PATCH RFC 0/6] pidfs: implement file handle support

[Christian Brauner]

Hey,

Now that we have the preliminaries to lookup struct pid based on its
inode number alone we can implement file handle support.

This is based on custom export operation methods which allows pidfs to
implement permission checking and opening of pidfs file handles cleanly
without hacking around in the core file handle code too much.

This is lightly tested.

Thanks!
Christian

---
Christian Brauner (5):
      fhandle: simplify error handling
      exportfs: add open method
      fhandle: pull CAP_DAC_READ_SEARCH check into may_decode_fh()
      exportfs: add permission method
      pidfs: implement file handle support

Erin Shepherd (1):
      pseudofs: add support for export_ops

 fs/fhandle.c              | 97 ++++++++++++++++++++++-------------------------
 fs/libfs.c                |  1 +
 fs/pidfs.c                | 96 ++++++++++++++++++++++++++++++++++++++++++++++
 include/linux/exportfs.h  | 20 ++++++++++
 include/linux/pseudo_fs.h |  1 +
 5 files changed, 164 insertions(+), 51 deletions(-)
---
base-commit: 94c9a56ad3521a28177610c63298d66de634cb9d
change-id: 20241129-work-pidfs-file_handle-07bdfb860a38