Commit bf8d0853 authored by Keith Busch's avatar Keith Busch Committed by Jens Axboe
Browse files

iomap: add support for dma aligned direct-io 



Use the address alignment requirements from the block_device for direct
io instead of requiring addresses be aligned to the block size.

Signed-off-by: default avatarKeith Busch <kbusch@kernel.org>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20220610195830.3574005-12-kbusch@fb.com


Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent b1a000d3

fs/iomap/direct-io.c

+2 −2
Original line number Diff line number Diff line
@@ -242,7 +242,6 @@ static loff_t iomap_dio_bio_iter(const struct iomap_iter *iter, 
	struct inode *inode = iter->inode;

	unsigned int blkbits = blksize_bits(bdev_logical_block_size(iomap->bdev));

	unsigned int fs_block_size = i_blocksize(inode), pad;

	unsigned int align = iov_iter_alignment(dio->submit.iter);

	loff_t length = iomap_length(iter);

	loff_t pos = iter->pos;

	unsigned int bio_opf;
@@ -253,7 +252,8 @@ static loff_t iomap_dio_bio_iter(const struct iomap_iter *iter, 
	size_t copied = 0;

	size_t orig_count;



	if ((pos | length | align) & ((1 << blkbits) - 1))

	if ((pos | length) & ((1 << blkbits) - 1) ||

	    !bdev_iter_is_aligned(iomap->bdev, dio->submit.iter))

		return -EINVAL;



	if (iomap->type == IOMAP_UNWRITTEN) {