[RFC PATCH 05/28] block: Skip dma-direct bios in bio_integrity_prep()

From: Logan Gunthorpe
Date: Thu Jun 20 2019 - 12:14:14 EST

The block layer will not be able to handle integrity for dma-direct
bios seeing it does not have access to the underlying data.

If users of dma-direct require integrity, they will have to handle it
in the layer creating the bios. This is left as future work should
somebody care about handling such a case.

Thus, bio_integrity_prep() should ignore dma-direct bios.

Signed-off-by: Logan Gunthorpe <logang@xxxxxxxxxxxx>
block/bio-integrity.c | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/block/bio-integrity.c b/block/bio-integrity.c
index 4db620849515..10fdf456fcd8 100644
--- a/block/bio-integrity.c
+++ b/block/bio-integrity.c
@@ -221,6 +221,10 @@ bool bio_integrity_prep(struct bio *bio)
if (bio_integrity(bio))
return true;

+ /* The block layer cannot handle integrity for dma-direct bios */
+ if (bio_is_dma_direct(bio))
+ return true;
if (bio_data_dir(bio) == READ) {
if (!bi->profile->verify_fn ||
!(bi->flags & BLK_INTEGRITY_VERIFY))