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Commit 64d656a1 authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Jens Axboe
Browse files

block: add back plugging in __blkdev_direct_IO 



This allows sending larger than 1 MB requests to devices that support
large I/O sizes.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Reported-by: default avatarLaurence Oberman <loberman@redhat.com>
Signed-off-by: default avatarJens Axboe <axboe@fb.com>
parent 50f6584e

fs/block_dev.c

+3 −0
Original line number Diff line number Diff line
@@ -328,6 +328,7 @@ __blkdev_direct_IO(struct kiocb *iocb, struct iov_iter *iter, int nr_pages) 
	struct file *file = iocb->ki_filp;

	struct inode *inode = bdev_file_inode(file);

	struct block_device *bdev = I_BDEV(inode);

	struct blk_plug plug;

	struct blkdev_dio *dio;

	struct bio *bio;

	bool is_read = (iov_iter_rw(iter) == READ);
@@ -353,6 +354,7 @@ __blkdev_direct_IO(struct kiocb *iocb, struct iov_iter *iter, int nr_pages) 
	dio->multi_bio = false;

	dio->should_dirty = is_read && (iter->type == ITER_IOVEC);



	blk_start_plug(&plug);

	for (;;) {

		bio->bi_bdev = bdev;

		bio->bi_iter.bi_sector = pos >> 9;
@@ -394,6 +396,7 @@ __blkdev_direct_IO(struct kiocb *iocb, struct iov_iter *iter, int nr_pages) 
		submit_bio(bio);

		bio = bio_alloc(GFP_KERNEL, nr_pages);

	}

	blk_finish_plug(&plug);



	if (!dio->is_sync)

		return -EIOCBQUEUED;