block: relax direct io memory alignment

Use the address alignment requirements from the block_device for direct
io instead of requiring addresses be aligned to the block size. User
space can discover the alignment requirements from the dma_alignment
queue attribute.

User space can specify any hardware compatible DMA offset for each
segment, but every segment length is still required to be a multiple of
the block size.

Signed-off-by: Keith Busch <kbusch@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20220610195830.3574005-11-kbusch@fb.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/block/bio.c b/block/bio.c
index ee5fe1b..933ea32 100644 (file)
--- a/block/bio.c
+++ b/block/bio.c
@@ -1220,7 +1220,16 @@ static int __bio_iov_iter_get_pages(struct bio *bio, struct iov_iter *iter)
        BUILD_BUG_ON(PAGE_PTRS_PER_BVEC < 2);
        pages += entries_left * (PAGE_PTRS_PER_BVEC - 1);
 
+       /*
+        * Each segment in the iov is required to be a block size multiple.
+        * However, we may not be able to get the entire segment if it spans
+        * more pages than bi_max_vecs allows, so we have to ALIGN_DOWN the
+        * result to ensure the bio's total size is correct. The remainder of
+        * the iov data will be picked up in the next bio iteration.
+        */
        size = iov_iter_get_pages(iter, pages, LONG_MAX, nr_pages, &offset);
+       if (size > 0)
+               size = ALIGN_DOWN(size, bdev_logical_block_size(bio->bi_bdev));
        if (unlikely(size <= 0))
                return size ? size : -EFAULT;
 

diff --git a/block/fops.c b/block/fops.c
index 9d32df6..86d3cab 100644 (file)
--- a/block/fops.c
+++ b/block/fops.c
@@ -45,8 +45,8 @@ static unsigned int dio_bio_write_op(struct kiocb *iocb)
 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));
+       return pos & (bdev_logical_block_size(bdev) - 1) ||
+               !bdev_iter_is_aligned(bdev, iter);
 }
 
 #define DIO_INLINE_BIO_VECS 4

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 0b8bc1f..886c44e 100644 (file)
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -424,6 +424,11 @@ struct request_queue {
        unsigned long           nr_requests;    /* Max # of requests */
 
        unsigned int            dma_pad_mask;
+       /*
+        * Drivers that set dma_alignment to less than 511 must be prepared to
+        * handle individual bvec's that are not a multiple of a SECTOR_SIZE
+        * due to possible offsets.
+        */
        unsigned int            dma_alignment;
 
 #ifdef CONFIG_BLK_INLINE_ENCRYPTION