In general, the bvec data structure consists of one for physically
continuous pages. But, in the bvec configuration for bip, physically
continuous integrity pages are composed of each bvec.
Allow bio_integrity_add_page() to create multi-page bvecs, just like
the bio payloads. This simplifies adding larger payloads, and fixes
support for non-tiny workloads with nvme, which stopped using
scatterlist for metadata a while ago.
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Fixes: 783b94bd9250 ("nvme-pci: do not build a scatterlist to map metadata")
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Jinyoung Choi <j-young.choi@xxxxxxxxxxx>
---
block/bio-integrity.c | 31 ++++++++++++++++++++++++-------
1 file changed, 24 insertions(+), 7 deletions(-)
diff --git a/block/bio-integrity.c b/block/bio-integrity.c
index c6b3bc86e1f9..ec8ac8cf6e1b 100644
--- a/block/bio-integrity.c
+++ b/block/bio-integrity.c
@@ -123,17 +123,34 @@ void bio_integrity_free(struct bio *bio)
int bio_integrity_add_page(struct bio *bio, struct page *page,
unsigned int len, unsigned int offset)
{
+ struct request_queue *q = bdev_get_queue(bio->bi_bdev);
struct bio_integrity_payload *bip = bio_integrity(bio);
- if (bip->bip_vcnt >= bip->bip_max_vcnt) {
- printk(KERN_ERR "%s: bip_vec full\n", __func__);
+ if (((bip->bip_iter.bi_size + len) >> SECTOR_SHIFT) >
+ queue_max_hw_sectors(q))
return 0;
- }
- if (bip->bip_vcnt &&
- bvec_gap_to_prev(&bdev_get_queue(bio->bi_bdev)->limits,
- &bip->bip_vec[bip->bip_vcnt - 1], offset))
- return 0;
+ if (bip->bip_vcnt > 0) {
+ struct bio_vec *bv = &bip->bip_vec[bip->bip_vcnt - 1];
+ bool same_page = false;
+
+ if (bvec_try_merge_hw_page(q, bv, page, len, offset,
+ &same_page)) {
+ bip->bip_iter.bi_size += len;
+ return len;
+ }
+
+ if (bip->bip_vcnt >=
+ min(bip->bip_max_vcnt, queue_max_integrity_segments(q)))
+ return 0;
+
+ /*
+ * If the queue doesn't support SG gaps and adding this segment
+ * would create a gap, disallow it.
+ */
+ if (bvec_gap_to_prev(&q->limits, bv, offset))
+ return 0;
+ }
bvec_set_page(&bip->bip_vec[bip->bip_vcnt], page, len, offset);
bip->bip_vcnt++;
--
2.34.1
