block: switch bios to blk_status_t

Replace bi_error with a new bi_status to allow for a clear conversion.
Note that device mapper overloaded bi_error with a private value, which
we'll have to keep arround at least for now and thus propagate to a
proper blk_status_t value.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>

1 files changed, 5 insertions, 2 deletions

diff --git a/fs/xfs/xfs_buf.c b/fs/xfs/xfs_buf.c
index 62fa39276a24..15c7a484a5d2 100644
--- a/fs/xfs/xfs_buf.c
+++ b/fs/xfs/xfs_buf.c
@@ -1213,8 +1213,11 @@ xfs_buf_bio_end_io(
          * don't overwrite existing errors - otherwise we can lose errors on
          * buffers that require multiple bios to complete.
          */
-        if (bio->bi_error)
-                cmpxchg(&bp->b_io_error, 0, bio->bi_error);
+        if (bio->bi_status) {
+                int error = blk_status_to_errno(bio->bi_status);
+
+                cmpxchg(&bp->b_io_error, 0, error);
+        }
 
         if (!bp->b_error && xfs_buf_is_vmapped(bp) && (bp->b_flags & XBF_READ))
                 invalidate_kernel_vmap_range(bp->b_addr, xfs_buf_vmap_len(bp));