bio-integrity: don't restrict the size of integrity metadata

bio_integrity_add_page restricts the size of the integrity metadata to
queue_max_hw_sectors(q). This restriction is not needed because oversized
bios are split automatically. This restriction causes problems with
dm-integrity 'inline' mode - if we send a large bio to dm-integrity and
the bio's metadata are larger than queue_max_hw_sectors(q),
bio_integrity_add_page fails and the bio is ended with BLK_STS_RESOURCE
error.

An example that triggers it:

dd: error writing '/dev/mapper/in2': Cannot allocate memory
1+0 records in
0+0 records out
0 bytes copied, 0.00169291 s, 0.0 kB/s

Signed-off-by: Mikulas Patocka <[email protected]>
Fixes: fb09876 ("dm-integrity: introduce the Inline mode")
Fixes: 0ece1d6 ("bio-integrity: create multi-page bvecs in bio_integrity_add_page()")
Reviewed-by: Ming Lei <[email protected]>
Reviewed-by: Christoph Hellwig <[email protected]>
Tested-by: Anuj Gupta <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jens Axboe <[email protected]>

Author: Mikulas Patocka

block/bio-integrity.c

@@ -167,10 +167,6 @@ int bio_integrity_add_page(struct bio *bio, struct page *page,
 	struct request_queue *q = bdev_get_queue(bio->bi_bdev);
 	struct bio_integrity_payload *bip = bio_integrity(bio);
 
-	if (((bip->bip_iter.bi_size + len) >> SECTOR_SHIFT) >
-	    queue_max_hw_sectors(q))
-		return 0;
-
 	if (bip->bip_vcnt > 0) {
 		struct bio_vec *bv = &bip->bip_vec[bip->bip_vcnt - 1];
 		bool same_page = false;