nstree: maintain list of owned namespaces

Browse source

The namespace tree doesn't express the ownership concept of namespace
appropriately. Maintain a list of directly owned namespaces per user
namespace. This will allow userspace and the kernel to use the listns()
system call to walk the namespace tree by owning user namespace. The
rbtree is used to find the relevant namespace entry point which allows
to continue iteration and the owner list can be used to walk the tree
completely lock free.

Link: https://patch.msgid.link/20251029-work-namespace-nstree-listns-v4-16-2e6f823ebdc0@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>

...

This commit is contained in:

Christian Brauner 2025-10-29 13:20:29 +01:00

parent 3760342fd6

commit 3c1a52f2a6

No known key found for this signature in database

GPG key ID: 91C61BC06578DCA2

3 changed files with 79 additions and 1 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

8

include/linux/ns_common.h

View file

4

kernel/nscommon.c

View file

68

kernel/nstree.c

View file