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Commented reasoning on why it's safe to replace
__sync_bool_compare_and_swap with __atomic_compare_exchange_n in each
location even though the latter has an additional side effect.
__sync_synchronize should be equivalent to __atomic_thread_fence with
__ATOMIC_SEQ_CST memory ordering.
This one is rather tricky, but changing the initialization of
current_val should give this the same effect. Based on ffmpeg's change
here: https://ffmpeg.org/pipermail/ffmpeg-devel/2014-October/164556.html
Quoting from them:
> The second reason is __atomic_compare_exchange_n(), and how it differs from
> __sync_val_compare_and_swap().
> While the latter returns *ptr as it was before the operation, the former
> doesn't and instead copies *ptr to oldval if the result of the
> comparison is false. This means that returning oldval will match the old behavoir
> without having to change the wrapper.
> A disassemble example from libavutil/buffer.o however hints that the
> __atomic function may be slower because of it writting oldval.
Let's not allow anyone to look into /root/ if we create it via the
base-filesystem logic. i.e. change 0755 → 0750 as default access mode
for /root/, in case we create it if it happens to be missing.
This allows growfs to expand the filesystem even when the underlying
block device cannot be expanded. This has been useful for example on
LUKS devices that have already been expanded using systemd-repart.
This works around the following error:
```
root@mobian:/home/mobian# /usr/lib/systemd/systemd-growfs /
crypt_resize() of /dev/block/179:2 failed: Operation not permitted
```
This causes systemd-growfs to exit before resizing the partition when
`--dry-run` is passed. Resizing during a dry run of a change breaks the
users expectations.
This is a simple safety check, since we shouldn't invoke ioctls on fds
without being reasonably sure they are of the right type since ioctls
are overloaded, and we might be tricked hence to execute an operation on
an fd which means something different than what we expect.
This reverts commit f42d41cc5f.
DHCPv6 client does not require MAC address.
DHCPv4 client will be handled in a different way in a later commit.
Partially fixes#23546.
