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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>
This commit is contained in:
Keith Busch 2022-06-10 12:58:24 -07:00 committed by Jens Axboe
parent 4a2dcc3591
commit 37fee2e42e
1 changed files with 10 additions and 6 deletions
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16
block/fops.c
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@ -42,6 +42,13 @@ static unsigned int dio_bio_write_op(struct kiocb *iocb)
return op;
}
static bool blkdev_dio_unaligned(struct block_device *bdev, loff_t pos,
struct iov_iter *iter)
{
return ((pos | iov_iter_alignment(iter)) &
(bdev_logical_block_size(bdev) - 1));
}
#define DIO_INLINE_BIO_VECS 4
static ssize_t __blkdev_direct_IO_simple(struct kiocb *iocb,
@ -54,8 +61,7 @@ static ssize_t __blkdev_direct_IO_simple(struct kiocb *iocb,
struct bio bio;
ssize_t ret;
if ((pos | iov_iter_alignment(iter)) &
(bdev_logical_block_size(bdev) - 1))
if (blkdev_dio_unaligned(bdev, pos, iter))
return -EINVAL;
if (nr_pages <= DIO_INLINE_BIO_VECS)
@ -173,8 +179,7 @@ static ssize_t __blkdev_direct_IO(struct kiocb *iocb, struct iov_iter *iter,
loff_t pos = iocb->ki_pos;
int ret = 0;
if ((pos | iov_iter_alignment(iter)) &
(bdev_logical_block_size(bdev) - 1))
if (blkdev_dio_unaligned(bdev, pos, iter))
return -EINVAL;
if (iocb->ki_flags & IOCB_ALLOC_CACHE)
@ -298,8 +303,7 @@ static ssize_t __blkdev_direct_IO_async(struct kiocb *iocb,
loff_t pos = iocb->ki_pos;
int ret = 0;
if ((pos | iov_iter_alignment(iter)) &
(bdev_logical_block_size(bdev) - 1))
if (blkdev_dio_unaligned(bdev, pos, iter))
return -EINVAL;
if (iocb->ki_flags & IOCB_ALLOC_CACHE)