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block: add a helper function for dio alignment
This will make it easier to add more complex acceptable alignment criteria in the future. Signed-off-by: Keith Busch <kbusch@kernel.org> Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Link: https://lore.kernel.org/r/20220610195830.3574005-6-kbusch@fb.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
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parent
4a2dcc3591
commit
37fee2e42e
1 changed files with 10 additions and 6 deletions
16
block/fops.c
16
block/fops.c
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@ -42,6 +42,13 @@ static unsigned int dio_bio_write_op(struct kiocb *iocb)
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return op;
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}
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static bool blkdev_dio_unaligned(struct block_device *bdev, loff_t pos,
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struct iov_iter *iter)
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{
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return ((pos | iov_iter_alignment(iter)) &
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(bdev_logical_block_size(bdev) - 1));
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}
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#define DIO_INLINE_BIO_VECS 4
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static ssize_t __blkdev_direct_IO_simple(struct kiocb *iocb,
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@ -54,8 +61,7 @@ static ssize_t __blkdev_direct_IO_simple(struct kiocb *iocb,
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struct bio bio;
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ssize_t ret;
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if ((pos | iov_iter_alignment(iter)) &
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(bdev_logical_block_size(bdev) - 1))
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if (blkdev_dio_unaligned(bdev, pos, iter))
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return -EINVAL;
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if (nr_pages <= DIO_INLINE_BIO_VECS)
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@ -173,8 +179,7 @@ static ssize_t __blkdev_direct_IO(struct kiocb *iocb, struct iov_iter *iter,
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loff_t pos = iocb->ki_pos;
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int ret = 0;
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if ((pos | iov_iter_alignment(iter)) &
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(bdev_logical_block_size(bdev) - 1))
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if (blkdev_dio_unaligned(bdev, pos, iter))
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return -EINVAL;
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if (iocb->ki_flags & IOCB_ALLOC_CACHE)
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@ -298,8 +303,7 @@ static ssize_t __blkdev_direct_IO_async(struct kiocb *iocb,
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loff_t pos = iocb->ki_pos;
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int ret = 0;
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if ((pos | iov_iter_alignment(iter)) &
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(bdev_logical_block_size(bdev) - 1))
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if (blkdev_dio_unaligned(bdev, pos, iter))
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return -EINVAL;
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if (iocb->ki_flags & IOCB_ALLOC_CACHE)
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