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Date: Fri, 21 Jan 2022 14:36:53 -0500
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Subject: [Virtio-fs] [virtiofsd] MR opened: mount_fd: Use Arc for MountFd
	reference counting
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To: virtio-fs@redhat.com

This commit moves `MountFd` and `MountFds` into a separate module
and uses `Arc<MountFd>` for refcounting instead of rolling
our own refcounting.

Supersedes !70
---
https://gitlab.com/virtio-fs/virtiofsd/-/merge_requests/73