loop cleanups v2

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To: Jens Axboe <axboe@xxxxxxxxx>
Subject: loop cleanups v2
From: Christoph Hellwig <hch@xxxxxx>
Date: Wed, 23 Jun 2021 16:58:59 +0200
Cc: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>, linux-block@xxxxxxxxxxxxxxx

Hi Jens,

this series contains a bunch of cleanups for the loop driver,
mostly related to probing and the control device.

Changes since v1:
 - use local variables instead of dereferencing struct loop_device
   outside loop_ctl_mutex

Follow-Ups:
- Re: loop cleanups v2
  - From: Jens Axboe
- [PATCH 9/9] loop: rewrite loop_exit using idr_for_each_entry
  - From: Christoph Hellwig
- [PATCH 8/9] loop: split loop_lookup
  - From: Christoph Hellwig
- [PATCH 7/9] loop: don't allow deleting an unspecified loop device
  - From: Christoph Hellwig
- [PATCH 6/9] loop: move loop_ctl_mutex locking into loop_add
  - From: Christoph Hellwig
- [PATCH 5/9] loop: split loop_control_ioctl
  - From: Christoph Hellwig
- [PATCH 4/9] loop: don't call loop_lookup before adding a loop device
  - From: Christoph Hellwig
- [PATCH 3/9] loop: remove the l argument to loop_add
  - From: Christoph Hellwig
- [PATCH 2/9] loop: reduce loop_ctl_mutex coverage in loop_exit
  - From: Christoph Hellwig
- [PATCH 1/9] loop: reorder loop_exit
  - From: Christoph Hellwig

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