erofs: iomap support for non-tailpacking DIO
Add iomap support for non-tailpacking uncompressed data in order to support DIO and DAX. Direct I/O is useful in certain scenarios for uncompressed files. For example, double pagecache can be avoid by direct I/O when loop device is used for uncompressed files containing upper layer compressed filesystem. This adds iomap DIO support for non-tailpacking cases first and tail-packing inline files are handled in the follow-up patch. Link: https://lore.kernel.org/r/20210805003601.183063-2-hsiangkao@linux.alibaba.com Cc: linux-fsdevel@vger.kernel.org Reviewed-by: NChao Yu <chao@kernel.org> Signed-off-by: NHuang Jianan <huangjianan@oppo.com> Signed-off-by: NGao Xiang <hsiangkao@linux.alibaba.com>
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