[PATCH 3/5] aio: add iocb->ki_blk_qc field

[Jens Axboe <axboe@kernel.dk>]

Add the field and have the blockdev direct_IO() helpers set it.
This is in preparation for being able to poll for iocb completion.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
 fs/block_dev.c     | 2 ++
 include/linux/fs.h | 1 +
 2 files changed, 3 insertions(+)

diff --git a/fs/block_dev.c b/fs/block_dev.c
index d233a59ea364..8a2fed18e3fc 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -236,6 +236,7 @@ __blkdev_direct_IO_simple(struct kiocb *iocb, struct iov_iter *iter,
 		bio.bi_opf |= REQ_HIPRI;
 
 	qc = submit_bio(&bio);
+	WRITE_ONCE(iocb->ki_blk_qc, qc);
 	for (;;) {
 		__set_current_state(TASK_UNINTERRUPTIBLE);
 
@@ -396,6 +397,7 @@ __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_blk_qc, qc);
 			break;
 		}
 
diff --git a/include/linux/fs.h b/include/linux/fs.h
index c95c0807471f..032761d9b218 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -310,6 +310,7 @@ struct kiocb {
 	int			ki_flags;
 	u16			ki_hint;
 	u16			ki_ioprio; /* See linux/ioprio.h */
+	u32			ki_blk_qc;
 } __randomize_layout;
 
 static inline bool is_sync_kiocb(struct kiocb *kiocb)
-- 
2.17.1