bcache superblock reading / writing v2

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To: colyli@xxxxxxx
Subject: bcache superblock reading / writing v2
From: Christoph Hellwig <hch@xxxxxx>
Date: Thu, 12 Dec 2019 16:35:57 +0100
Cc: kent.overstreet@xxxxxxxxx, liangchen.linux@xxxxxxxxx, linux-bcache@xxxxxxxxxxxxxxx, linux-block@xxxxxxxxxxxxxxx

Hi Coly and Liang,

can you review this series to sort out the bcache superblock reading for
larger page sizes?  I don't have bcache test setup so this is compile
tested only.

Changes since v1:
 - actually assing ->sb_disk
 - fix the cover letter subject line

Follow-Ups:
- [PATCH 7/7] bcache: use read_cache_page_gfp to read the superblock
  - From: Christoph Hellwig
- [PATCH 6/7] bcache: store a pointer to the on-disk sb in the cache and cached_dev structures
  - From: Christoph Hellwig
- [PATCH 5/7] bcache: return a pointer to the on-disk sb from read_super
  - From: Christoph Hellwig
- [PATCH 4/7] bcache: transfer the sb_page reference to register_{bdev,cache}
  - From: Christoph Hellwig
- [PATCH 3/7] bcache: rework error unwinding in register_bcache
  - From: Christoph Hellwig
- [PATCH 2/7] bcache: use a separate data structure for the on-disk super block
  - From: Christoph Hellwig
- [PATCH 1/7] bcache: cached_dev_free needs to put the sb page
  - From: Christoph Hellwig

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