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

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Date:   Mon, 27 Apr 2020 11:58:50 +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)

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.