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exfat: add iomap buffered I/O support
Add full buffered I/O support using the iomap framework to the exfat filesystem. This will replaces the old exfat_get_block(), exfat_write_begin(), exfat_write_end(), and exfat_block_truncate_page() with their iomap equivalents. Buffered writes now use iomap_file_buffered_write(), read uses iomap_bio_read_folio() and iomap_bio_readahead(), and writeback is handled through iomap_writepages(). Acked-by: Christoph Hellwig <hch@lst.de> Acked-by: "Darrick J. Wong" <djwong@kernel.org> Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
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