Add a __anon_inode_getfd helper

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Subject: Add a __anon_inode_getfd helper
From: Christoph Hellwig <hch@xxxxxx>
Date: Fri, 8 May 2020 17:36:22 +0200
Cc: linux-integrity@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-gpio@xxxxxxxxxxxxxxx, dri-devel@xxxxxxxxxxxxxxxxxxxxx, linux-rdma@xxxxxxxxxxxxxxx, kvm@xxxxxxxxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx, io-uring@xxxxxxxxxxxxxxx, netdev@xxxxxxxxxxxxxxx, bpf@xxxxxxxxxxxxxxx

Hi Al,

this series (against your work.epoll branch), adds a new
__anon_inode_getfd helper, which exposes the functionality in
anon_inode_getfd minus installing the file descriptor.  This
allows to clean up a lot of the places that currently open code
the functionality.

Follow-Ups:
- [PATCH 03/12] pidfd: use __anon_inode_getfd
  - From: Christoph Hellwig
- [PATCH 02/12] kvm: use __anon_inode_getfd
  - From: Christoph Hellwig
- [PATCH 01/12] fd: add a new __anon_inode_getfd helper
  - From: Christoph Hellwig
- [PATCH 04/12] bpf: use __anon_inode_getfd
  - From: Christoph Hellwig
- [PATCH 06/12] eventpoll: use __anon_inode_getfd
  - From: Christoph Hellwig
- [PATCH 08/12] vfio: use __anon_inode_getfd
  - From: Christoph Hellwig
- [PATCH 07/12] eventfd: use __anon_inode_getfd
  - From: Christoph Hellwig
- [PATCH 09/12] rdma: use __anon_inode_getfd
  - From: Christoph Hellwig
- [PATCH 10/12] drm_syncobj: use __anon_inode_getfd
  - From: Christoph Hellwig
- [PATCH 12/12] vtpm_proxy: use __anon_inode_getfd
  - From: Christoph Hellwig
- [PATCH 11/12] gpiolib: use __anon_inode_getfd
  - From: Christoph Hellwig
- [PATCH 05/12] io_uring: use __anon_inode_getfd
  - From: Christoph Hellwig

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