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A magic entry registered with 'D' and the same entry without it, to pin down what the flag decides and what it leaves alone: - the entry reports itself disabled and nothing dispatches until '1' is written to it - without 'D' it dispatches straight away - 'D' is not read back among the entry's flags - enabling and disabling afterwards works as it does for any entry - 'D' composes with the flags that shape the invocation - '-1' to the status file removes a staged entry like any other - a file handle held across a removal cannot resurrect the entry Put the entry write and read-back helpers into binfmt_misc_common.h. The bpf suite will need them as well. Link: https://patch.msgid.link/20260730-work-binfmt_misc-preopen-v1-3-4a0b0da71f16@kernel.org Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>