[PATCH 3/4] block_dev: support protect information passthrough

[Bob Liu <bob.liu@xxxxxxxxxx>]

Support protect information passed from use sapce, on direct io
is considered now.

Signed-off-by: Bob Liu <bob.liu@xxxxxxxxxx>
---
 fs/block_dev.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/fs/block_dev.c b/fs/block_dev.c
index 69bf2fb..10e3299 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -348,6 +348,13 @@ __blkdev_direct_IO(struct kiocb *iocb, struct iov_iter *iter, int nr_pages)
 	loff_t pos = iocb->ki_pos;
 	blk_qc_t qc = BLK_QC_T_NONE;
 	int ret = 0;
+	struct iovec *pi_iov;
+
+	if (iocb->ki_flags & IOCB_USE_PI) {
+		ret = iter_slice_protect_info(iter, nr_pages, &pi_iov);
+		if (ret)
+			return -EINVAL;
+	}
 
 	if ((pos | iov_iter_alignment(iter)) &
 	    (bdev_logical_block_size(bdev) - 1))
@@ -411,6 +418,16 @@ __blkdev_direct_IO(struct kiocb *iocb, struct iov_iter *iter, int nr_pages)
 				polled = true;
 			}
 
+			/* Add protection information to bio */
+			if (iocb->ki_flags & IOCB_USE_PI) {
+				ret = bio_integrity_prep_from_iovec(bio, pi_iov);
+				if (ret) {
+					bio->bi_status = BLK_STS_IOERR;
+					bio_endio(bio);
+					break;
+				}
+			}
+
 			qc = submit_bio(bio);
 
 			if (polled)
-- 
2.9.5