fix fiemap for ext4 bitmap files (+ cleanups) v2

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To: linux-ext4@xxxxxxxxxxxxxxx, viro@xxxxxxxxxxxxxxxxxx
Subject: fix fiemap for ext4 bitmap files (+ cleanups) v2
From: Christoph Hellwig <hch@xxxxxx>
Date: Mon, 27 Apr 2020 20:19:46 +0200
Cc: jack@xxxxxxx, tytso@xxxxxxx, adilger@xxxxxxxxx, riteshh@xxxxxxxxxxxxx, amir73il@xxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx, linux-unionfs@xxxxxxxxxxxxxxx

Hi all,

the first two patches should fix the issue where ext4 doesn't
properly check the max file size for bitmap files in fiemap.

The rest cleans up the fiemap support in ext4 and in general.

Changes since v1:
 - rename fiemap_validate to fiemap_prep
 - lift FIEMAP_FLAG_SYNC handling to common code
 - add a new linux/fiemap.h header
 - remove __generic_block_fiemap
 - remove access_ok calls from fiemap and ext4

Follow-Ups:
- [PATCH 11/11] ext4: remove the access_ok() check in ext4_ioctl_get_es_cache
  - From: Christoph Hellwig
- [PATCH 10/11] fs: remove the access_ok() check in ioctl_fiemap
  - From: Christoph Hellwig
- [PATCH 09/11] fs: handle FIEMAP_FLAG_SYNC in fiemap_prep
  - From: Christoph Hellwig
- [PATCH 08/11] fs: move fiemap range validation into the file systems instances
  - From: Christoph Hellwig
- [PATCH 07/11] iomap: fix the iomap_fiemap prototype
  - From: Christoph Hellwig
- [PATCH 06/11] fs: move the fiemap definitions out of fs.h
  - From: Christoph Hellwig
- [PATCH 04/11] ext4: remove the call to fiemap_check_flags in ext4_fiemap
  - From: Christoph Hellwig
- [PATCH 05/11] fs: mark __generic_block_fiemap static
  - From: Christoph Hellwig
- [PATCH 03/11] ext4: split _ext4_fiemap
  - From: Christoph Hellwig
- [PATCH 01/11] ext4: fix EXT4_MAX_LOGICAL_BLOCK macro
  - From: Christoph Hellwig
- [PATCH 02/11] ext4: fix fiemap size checks for bitmap files
  - From: Christoph Hellwig

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