linux-ext4 - fix fiemap for ext4 bitmap files (+ cleanups) v2

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Date:   Mon, 27 Apr 2020 20:19:46 +0200
From:   Christoph Hellwig <hch@....de>
To:     linux-ext4@...r.kernel.org, viro@...iv.linux.org.uk
Cc:     jack@...e.cz, tytso@....edu, adilger@...ger.ca,
        riteshh@...ux.ibm.com, amir73il@...il.com,
        linux-fsdevel@...r.kernel.org, linux-unionfs@...r.kernel.org
Subject: fix fiemap for ext4 bitmap files (+ cleanups) v2

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