bdi lifetime fix

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To: Jens Axboe <axboe@xxxxxxxxx>
Subject: bdi lifetime fix
From: Christoph Hellwig <hch@xxxxxx>
Date: Mon, 16 Aug 2021 14:26:12 +0200
Cc: Qian Cai <quic_qiancai@xxxxxxxxxxx>, linux-block@xxxxxxxxxxxxxxx

Hi Jens,

this series fixes a bdi lifetime issue.  The bug report was triggered
by the move of the bdi to the gendisk, but the underlying issue is much
older.

This supersedes the ealier "block: ensure the bdi is freed after
inode_detach_wb" patch.

Follow-Ups:
- Re: bdi lifetime fix
  - From: Jens Axboe
- [PATCH 2/2] block: ensure the bdi is freed after inode_detach_wb
  - From: Christoph Hellwig
- [PATCH 1/2] block: free the extended dev_t minor later
  - From: Christoph Hellwig

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