bdi: fix use-after-free for dev_name(bdi->dev) v3

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To: axboe@xxxxxxxxx
Subject: bdi: fix use-after-free for dev_name(bdi->dev) v3
From: Christoph Hellwig <hch@xxxxxx>
Date: Wed, 22 Apr 2020 09:38:42 +0200
Cc: yuyufen@xxxxxxxxxx, tj@xxxxxxxxxx, jack@xxxxxxx, bvanassche@xxxxxxx, tytso@xxxxxxx, hdegoede@xxxxxxxxxx, gregkh@xxxxxxxxxxxxxxxxxxx, linux-block@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx

Hi all,

the first three patches are my take on the proposal from Yufen Yu
to fix the use after free of the device name of the bdi device.

The rest is vaguely related cleanups.

Changes since v2:
 - switch vboxsf to a shorter bdi name

Changes since v1:
 - use a static dev_name buffer inside struct backing_dev_info

Follow-Ups:
- Re: bdi: fix use-after-free for dev_name(bdi->dev) v3
  - From: Christoph Hellwig
- Re: bdi: fix use-after-free for dev_name(bdi->dev) v3
  - From: Christoph Hellwig
- [PATCH 4/9] bdi: add a ->dev_name field to struct backing_dev_info
  - From: Christoph Hellwig
- [PATCH 2/9] bdi: move bdi_dev_name out of line
  - From: Christoph Hellwig
- [PATCH 3/9] bdi: use bdi_dev_name() to get device name
  - From: Christoph Hellwig
- [PATCH 5/9] driver core: remove device_create_vargs
  - From: Christoph Hellwig
- [PATCH 6/9] bdi: unexport bdi_register_va
  - From: Christoph Hellwig
- [PATCH 9/9] bdi: remove the name field in struct backing_dev_info
  - From: Christoph Hellwig
- [PATCH 8/9] bdi: simplify bdi_alloc
  - From: Christoph Hellwig
- [PATCH 7/9] bdi: remove bdi_register_owner
  - From: Christoph Hellwig
- [PATCH 1/9] vboxsf: don't use the source name in the bdi name
  - From: Christoph Hellwig

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