[PATCH 04/20] block: wire up block device iopoll method
From: Jens Axboe <axboe@kernel.dk>
Date: 2018-11-27 03:40:34
Also in:
linux-fsdevel
Subsystem:
filesystems (vfs and infrastructure), the rest · Maintainers:
Alexander Viro, Christian Brauner, Linus Torvalds
From: Christoph Hellwig <hch@lst.de> Just call blk_poll on the iocb cookie, we can derive the block device from the inode trivially. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk> --- fs/block_dev.c | 10 ++++++++++ 1 file changed, 10 insertions(+)
diff --git a/fs/block_dev.c b/fs/block_dev.c
index d233a59ea364..9acb26f7c9ec 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c@@ -281,6 +281,14 @@ struct blkdev_dio { static struct bio_set blkdev_dio_pool; +static int blkdev_iopoll(struct kiocb *kiocb, bool wait) +{ + struct block_device *bdev = I_BDEV(kiocb->ki_filp->f_mapping->host); + struct request_queue *q = bdev_get_queue(bdev); + + return blk_poll(q, READ_ONCE(kiocb->ki_cookie), wait); +} + static void blkdev_bio_end_io(struct bio *bio) { struct blkdev_dio *dio = bio->bi_private;
@@ -396,6 +404,7 @@ __blkdev_direct_IO(struct kiocb *iocb, struct iov_iter *iter, int nr_pages) bio->bi_opf |= REQ_HIPRI; qc = submit_bio(bio); + WRITE_ONCE(iocb->ki_cookie, qc); break; }
@@ -2061,6 +2070,7 @@ const struct file_operations def_blk_fops = { .llseek = block_llseek, .read_iter = blkdev_read_iter, .write_iter = blkdev_write_iter, + .iopoll = blkdev_iopoll, .mmap = generic_file_mmap, .fsync = blkdev_fsync, .unlocked_ioctl = block_ioctl,
--
2.17.1