selftests: add FSMOUNT_NAMESPACE tests

Add selftests for FSMOUNT_NAMESPACE which creates a new mount namespace
with the newly created filesystem mounted onto a copy of the real
rootfs.

Link: https:

selftests: add FSMOUNT_NAMESPACE tests

Add selftests for FSMOUNT_NAMESPACE which creates a new mount namespace
with the newly created filesystem mounted onto a copy of the real
rootfs.

Link: https://patch.msgid.link/20260122-work-fsmount-namespace-v1-6-5ef0a886e646@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>

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selftests/statmount: add statmount_alloc() helper

Add a helper to allocate a statmount buffer and call statmount(). This
helper will be shared by multiple test suites that need to query mount
inform

selftests/statmount: add statmount_alloc() helper

Add a helper to allocate a statmount buffer and call statmount(). This
helper will be shared by multiple test suites that need to query mount
information via statmount().

Link: https://patch.msgid.link/20260122-work-fsmount-namespace-v1-5-5ef0a886e646@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>

show more ...