[RFC PATCH 09/28] block: Introduce vec_gap_to_prev()

Logan Gunthorpe
2019-06-20T16:12:21Z

Introduce vec_gap_to_prev() which is a more general
form of bvec_gap_to_prev().

In order to support splitting dma_vecs we will need to do a similar
calcualtion using the DMA address and length.

Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
---
block/blk.h | 21 +++++++++++++++++++--
1 file changed, 19 insertions(+), 2 deletions(-)

diff --git a/block/blk.h b/block/blk.h
index 4142383eed7a..c5512fefe703 100644
--- a/block/blk.h
+++ b/block/blk.h
@@ -98,11 +98,19 @@ static inline bool dmavec_phys_mergeable(struct request_queue *q,
vec2->dv_addr, vec2->dv_len);
}

+static inline bool __vec_gap_to_prev(struct request_queue *q,
+ unsigned int prv_offset, unsigned int prv_len,
+ unsigned int nxt_offset)
+{
+ return (nxt_offset & queue_virt_boundary(q)) ||
+ ((prv_offset + prv_len) & queue_virt_boundary(q));
+}
+
static inline bool __bvec_gap_to_prev(struct request_queue *q,
struct bio_vec *bprv, unsigned int offset)
{
- return (offset & queue_virt_boundary(q)) ||
- ((bprv->bv_offset + bprv->bv_len) & queue_virt_boundary(q));
+ return __vec_gap_to_prev(q, bprv->bv_offset, bprv->bv_len,
+ offset);
}

/*
@@ -117,6 +125,15 @@ static inline bool bvec_gap_to_prev(struct request_queue *q,
return __bvec_gap_to_prev(q, bprv, offset);
}

+static inline bool vec_gap_to_prev(struct request_queue *q,
+ unsigned int prv_offset, unsigned int prv_len,
+ unsigned int nxt_offset)
+{
+ if (!queue_virt_boundary(q))
+ return false;
+ return __vec_gap_to_prev(q, prv_offset, prv_len, nxt_offset);
+}
+
#ifdef CONFIG_BLK_DEV_INTEGRITY
void blk_flush_integrity(void);
bool __bio_integrity_endio(struct bio *);
--
2.20.1