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Merge tag 'vfs-6.11.pidfs' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
Pull pidfs updates from Christian Brauner:
"This contains work to make it possible to derive namespace file
descriptors from pidfd file descriptors.
Right now it is already possible to use a pidfd with setns() to
atomically change multiple namespaces at the same time. In other
words, it is possible to switch to the namespace context of a process
using a pidfd. There is no need to first open namespace file
descriptors via procfs.
The work included here is an extension of these abilities by allowing
to open namespace file descriptors using a pidfd. This means it is now
possible to interact with namespaces without ever touching procfs.
To this end a new set of ioctls() on pidfds is introduced covering all
supported namespace types"
* tag 'vfs-6.11.pidfs' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs:
pidfs: allow retrieval of namespace file descriptors
nsfs: add open_namespace()
nsproxy: add helper to go from arbitrary namespace to ns_common
nsproxy: add a cleanup helper for nsproxy
file: add take_fd() cleanup helper
98f3a9a4fd