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[RFC,0/2] pidfs: support bind-mounts

Message ID 20241219-work-pidfs-mount-v1-0-dbc56198b839@kernel.org (mailing list archive)
Headers show
Series pidfs: support bind-mounts | expand

Message

Christian Brauner Dec. 19, 2024, 5:01 p.m. UTC 
Allow bind-mounting pidfds. Similar to nsfs let's allow bind-mounts for
pidfds. This allows pidfds to be safely recovered and checked for
process recycling.

Instead of checking d_ops for both nsfs and pidfs we could in a
follow-up patch add a flag argument to struct dentry_operations that
functions similar to file_operations->fop_flags.

Signed-off-by: Christian Brauner <brauner@kernel.org>
---
Christian Brauner (2):
      pidfs: allow bind-mounts
      selftests: add pidfd bind-mount tests

 fs/namespace.c                                   |  10 +-
 fs/pidfs.c                                       |   2 +-
 include/linux/pidfs.h                            |   1 +
 tools/testing/selftests/pidfd/.gitignore         |   1 +
 tools/testing/selftests/pidfd/Makefile           |   2 +-
 tools/testing/selftests/pidfd/pidfd_bind_mount.c | 188 +++++++++++++++++++++++
 6 files changed, 200 insertions(+), 4 deletions(-)
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base-commit: 16ecd47cb0cd895c7c2f5dd5db50f6c005c51639
change-id: 20241219-work-pidfs-mount-930f9899a1cd