ext4: move ext4 bmap to use iomap infrastructure
ext4_iomap_begin is already implemented which provides ext4_map_blocks,
so just move the API from generic_block_bmap to iomap_bmap for iomap
conversion.
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Ritesh Harjani <riteshh@linux.ibm.com>
Link: https://lore.kernel.org/r/8bbd53bd719d5ccfecafcce93f2bf1d7955a44af.1582880246.git.riteshh@linux.ibm.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
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