linux-ext4 - fix fiemap for ext4 bitmap files (+ cleanups) v3

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Date:   Tue,  5 May 2020 17:43:13 +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) v3

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 v2:
 - commit message typo
 - doc updates
 - use d_inode in cifs
 - add a missing return statement in cifs
 - remove the filemap_write_and_wait call from ext4_ioctl_get_es_cache

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