[PATCH 2/3] xfs: get allocation alignment from the buftarg

[Dave Chinner <david@fromorbit.com>]

From: Dave Chinner <dchinner@redhat.com>

Needed to feed into the allocation routine to guarantee the memory
buffers we add to bios are correctly aligned to the underlying
device.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
---
 fs/xfs/xfs_buf.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/fs/xfs/xfs_buf.h b/fs/xfs/xfs_buf.h
index c6e57a3f409e..f6ce17d8d848 100644
--- a/fs/xfs/xfs_buf.h
+++ b/fs/xfs/xfs_buf.h
@@ -350,6 +350,12 @@ extern int xfs_setsize_buftarg(xfs_buftarg_t *, unsigned int);
 #define xfs_getsize_buftarg(buftarg)	block_size((buftarg)->bt_bdev)
 #define xfs_readonly_buftarg(buftarg)	bdev_read_only((buftarg)->bt_bdev)
 
+static inline int
+xfs_buftarg_dma_alignment(struct xfs_buftarg *bt)
+{
+	return queue_dma_alignment(bt->bt_bdev->bd_disk->queue);
+}
+
 int xfs_buf_reverify(struct xfs_buf *bp, const struct xfs_buf_ops *ops);
 bool xfs_verify_magic(struct xfs_buf *bp, __be32 dmagic);
 bool xfs_verify_magic16(struct xfs_buf *bp, __be16 dmagic);
-- 
2.23.0.rc1