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

From: Christoph Hellwig
Date: Wed Apr 22 2020 - 03:39:07 EST

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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

Next message: Christoph Hellwig: "[PATCH 3/9] bdi: use bdi_dev_name() to get device name"
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Next in thread: Christoph Hellwig: "[PATCH 1/9] vboxsf: don't use the source name in the bdi name"
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