This patch set fix various problems spotted during T10/DIF integrity machinery testing. TOC: ## Fix various bugs in T10/DIF/DIX infrastructure 0001-bio-integrity-Do-not-allocate-integrity-context-for 0002-bio-integrity-bio_trim-should-truncate-integrity-vec 0003-bio-integrity-bio_integrity_advance-must-update-inte 0004-bio-integrity-fix-interface-for-bio_integrity_trim 0005-bio-integrity-fold-bio_integrity_enabled-to-bio_integrity ## Cleanup T10/DIF/DIX infrastructure 0006-T10-Move-opencoded-contants-to-common-header 0007-Guard-bvec-iteration-logic-v3 0008-bio-add-bvec_iter-rewind-API 0009-bio-integrity-Restore-original-iterator-on-verify Changes since V2 - Cleanups in response to commens from axboe@ and hch@ - Use rewind bvec api to restore original vector on verify - fix one more bug with bip_seed update on bio split. Changes since V1 - fix issues potted by kbuild bot - Replace BUG_ON with error logic for 7'th patch Testcase: xfstest blockdev/003 https://github.com/dmonakhov/xfstests/commit/3c6509eaa83b9c17cd0bc95d73fcdd76e1c54a85
