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| author |   Christian Brauner <brauner@kernel.org> | 2024-11-29 14:38:05 +0100 |
|---|---|---|
| committer | Christian Brauner <brauner@kernel.org> | 2024-12-17 09:16:17 +0100 |
| commit | b3caba8f7a34a2bbaf45ffc6ff3a49b70afeb192 (patch) | |
| tree | 292d86daacf8cb64d8bf4374a5cc2e8659dd8a3f /scripts/lib/kdoc/kdoc_output.py | |
| parent | exportfs: add permission method (diff) | |
| download | linux-rng-b3caba8f7a34a2bbaf45ffc6ff3a49b70afeb192.tar.xz linux-rng-b3caba8f7a34a2bbaf45ffc6ff3a49b70afeb192.zip | |
pidfs: implement file handle support
On 64-bit platforms, userspace can read the pidfd's inode in order to
get a never-repeated PID identifier. On 32-bit platforms this identifier
is not exposed, as inodes are limited to 32 bits. Instead expose the
identifier via export_fh, which makes it available to userspace via
name_to_handle_at.
In addition we implement fh_to_dentry, which allows userspace to
recover a pidfd from a pidfs file handle.
Signed-off-by: Erin Shepherd <erin.shepherd@e43.eu>
[brauner: patch heavily rewritten]
Link: https://lore.kernel.org/r/20241129-work-pidfs-file_handle-v1-6-87d803a42495@kernel.org
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Co-Developed-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>
Diffstat (limited to 'scripts/lib/kdoc/kdoc_output.py')
0 files changed, 0 insertions, 0 deletions