ext2: use iomap_zero_range() for zeroing truncated page in DAX path
Currently the last user of ext2_get_blocks() for DAX inodes was dax_truncate_page(). Convert that to iomap_zero_range() so that all DAX IO uses the iomap path. Reviewed-by: NRoss Zwisler <ross.zwisler@linux.intel.com> Signed-off-by: NJan Kara <jack@suse.cz> Signed-off-by: NTheodore Ts'o <tytso@mit.edu>
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