block: split struct bio_integrity_payload

Many of the fields in struct bio_integrity_payload are only needed for
the default integrity buffer in the block layer, and the variable
sized array at the end of the structure makes it very hard to embed
into caller allocated structures.

Reduce struct bio_integrity_payload to the minimal structure needed in
common code and create two separate containing structures for the
automatically generated payload and the caller allocated payload.
The latter is a simple wrapper for struct bio_integrity_payload and
the bvecs, while the former contains the additional fields moved out
of struct bio_integrity_payload.

Always use a dedicated mempool for automatic integrity metadata
instead of depending on bio_set that is submitter controlled and thus
often doesn't have the mempool initialized and stop using mempools for
the submitter buffers as they aren't in the NOIO I/O submission path
where we need to guarantee forward progress.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Tested-by: Anuj Gupta <anuj20.g@samsung.com>
Reviewed-by: Anuj Gupta <anuj20.g@samsung.com>
Reviewed-by: Kanchan Joshi <joshi.k@samsung.com>
Link: https://lore.kernel.org/r/20250225154449.422989-4-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>

4 files changed, 0 insertions, 43 deletions

diff --git a/drivers/md/dm-integrity.c b/drivers/md/dm-integrity.c
index ee9f7cecd78e..e743657379f7 100644
--- a/drivers/md/dm-integrity.c
+++ b/drivers/md/dm-integrity.c
@@ -4808,23 +4808,11 @@ static int dm_integrity_ctr(struct dm_target *ti, unsigned int argc, char **argv
 			ti->error = "Cannot allocate bio set";
 			goto bad;
 		}
-		r = bioset_integrity_create(&ic->recheck_bios, RECHECK_POOL_SIZE);
-		if (r) {
-			ti->error = "Cannot allocate bio integrity set";
-			r = -ENOMEM;
-			goto bad;
-		}
 		r = bioset_init(&ic->recalc_bios, 1, 0, BIOSET_NEED_BVECS);
 		if (r) {
 			ti->error = "Cannot allocate bio set";
 			goto bad;
 		}
-		r = bioset_integrity_create(&ic->recalc_bios, 1);
-		if (r) {
-			ti->error = "Cannot allocate bio integrity set";
-			r = -ENOMEM;
-			goto bad;
-		}
 	}
 
 	ic->metadata_wq = alloc_workqueue("dm-integrity-metadata",
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index bf9a61191e9a..453803f1edf5 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -1081,15 +1081,9 @@ static int dm_table_alloc_md_mempools(struct dm_table *t, struct mapped_device *
 		__alignof__(struct dm_io)) + DM_IO_BIO_OFFSET;
 	if (bioset_init(&pools->io_bs, pool_size, io_front_pad, bioset_flags))
 		goto out_free_pools;
-	if (mempool_needs_integrity &&
-	    bioset_integrity_create(&pools->io_bs, pool_size))
-		goto out_free_pools;
 init_bs:
 	if (bioset_init(&pools->bs, pool_size, front_pad, 0))
 		goto out_free_pools;
-	if (mempool_needs_integrity &&
-	    bioset_integrity_create(&pools->bs, pool_size))
-		goto out_free_pools;
 
 	t->mempools = pools;
 	return 0;
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 30b3dbbce2d2..79cabe4be77d 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -2359,19 +2359,6 @@ int md_integrity_register(struct mddev *mddev)
 		return 0; /* shouldn't register */
 
 	pr_debug("md: data integrity enabled on %s\n", mdname(mddev));
-	if (bioset_integrity_create(&mddev->bio_set, BIO_POOL_SIZE) ||
-	    (mddev->level != 1 && mddev->level != 10 &&
-	     bioset_integrity_create(&mddev->io_clone_set, BIO_POOL_SIZE))) {
-		/*
-		 * No need to handle the failure of bioset_integrity_create,
-		 * because the function is called by md_run() -> pers->run(),
-		 * md_run calls bioset_exit -> bioset_integrity_free in case
-		 * of failure case.
-		 */
-		pr_err("md: failed to create integrity pool for %s\n",
-		       mdname(mddev));
-		return -EINVAL;
-	}
 	return 0;
 }
 EXPORT_SYMBOL(md_integrity_register);
diff --git a/drivers/target/target_core_iblock.c b/drivers/target/target_core_iblock.c
index c8dc92a7d63e..73564efd11d2 100644
--- a/drivers/target/target_core_iblock.c
+++ b/drivers/target/target_core_iblock.c
@@ -167,18 +167,6 @@ static int iblock_configure_device(struct se_device *dev)
 		break;
 	}
 
-	if (dev->dev_attrib.pi_prot_type) {
-		struct bio_set *bs = &ib_dev->ibd_bio_set;
-
-		if (bioset_integrity_create(bs, IBLOCK_BIO_POOL_SIZE) < 0) {
-			pr_err("Unable to allocate bioset for PI\n");
-			ret = -ENOMEM;
-			goto out_blkdev_put;
-		}
-		pr_debug("IBLOCK setup BIP bs->bio_integrity_pool: %p\n",
-			 &bs->bio_integrity_pool);
-	}
-
 	dev->dev_attrib.hw_pi_prot_type = dev->dev_attrib.pi_prot_type;
 	return 0;