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Thu, 29 Oct 2026 08:58:38 -0700 (PDT) X-Received: by 2002:a05:7022:ed06:b0:182:9071:3249 with SMTP id a92af1059eb24-1a6ced8ec45mr7441587c88.30.1793289517483; Thu, 29 Oct 2026 08:58:37 -0700 (PDT) Received: from alpha ([76.166.245.42]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-1abea527afesm23753c88.15.2026.10.29.08.58.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 29 Oct 2026 08:58:36 -0700 (PDT) From: Kyle Bader To: Jens Axboe , Pavel Begunkov Cc: Kyle Bader , Anuj Gupta , Kanchan Joshi , Christoph Hellwig , Keith Busch , "Martin K. Petersen" , Tushar Gohad , linux-block@vger.kernel.org, io-uring@vger.kernel.org, linux-nvme@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH v2] block: only fail dma-buf bios that need block layer PI Date: Thu, 29 Oct 2026 15:58:21 +0000 Message-ID: <20261029155821.2983229-1-kbader@redhat.com> X-Mailer: git-send-email 2.56.0 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Kyle Bader All dma-buf (P2P) I/O to a device with integrity data is rejected today, at registration and in blk_mq_submit_bio(). Only a bio for which the block layer generates or verifies PI needs that. The block layer then walks the bio_vecs, and a dma-buf bio has none. Reject only those bios, and remove the check at registration. Then a submitter that attaches its own PI, for example with IORING_RW_ATTR_FLAG_PI, can do dma-buf I/O to such a device. Link: https://lore.kernel.org/all/bbb87d6b-b7a3-487a-8be4-27f3f9ce4a1b@samsung.com/ Assisted-by: LLM Reviewed-by: Anuj Gupta Signed-off-by: Kyle Bader --- v2: a shorter commit message (Christoph), and Anuj's Reviewed-by. The code is the same as in v1, so the tests of v1 still apply. v1: https://lore.kernel.org/all/20261028181412.1919506-1-kbader@redhat.com/ block/blk-mq.c | 9 ++++++++- block/fops.c | 2 -- 2 files changed, 8 insertions(+), 3 deletions(-) diff --git a/block/blk-mq.c b/block/blk-mq.c index 7fff1305b..3fc9fdeb3 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -3138,8 +3138,15 @@ void blk_mq_submit_bio(struct bio *bio) goto queue_exit; } + /* + * The block layer cannot generate or verify PI for a dma-buf bio, as + * that walks the data pages. Only fail the bio if it needs that, not + * if the submitter attached its own integrity payload or if PI + * generation or verification is turned off for the device. + */ if (unlikely(op_is_dmabuf(bio->bi_opf) && - bdev_has_integrity_csum(bio->bi_bdev))) { + bdev_has_integrity_csum(bio->bi_bdev) && + (bio_integrity_action(bio) & BI_ACT_CHECK))) { bio_endio_status(bio, BLK_STS_NOTSUPP); goto queue_exit; } diff --git a/block/fops.c b/block/fops.c index 01bc8afe3..5c8024011 100644 --- a/block/fops.c +++ b/block/fops.c @@ -947,8 +947,6 @@ static int blkdev_init_dma_buf_io_ctx(struct file *file, return -EINVAL; if (!disk->fops->init_dma_buf_io_ctx) return -EOPNOTSUPP; - if (bdev_has_integrity_csum(bdev)) - return -EOPNOTSUPP; return disk->fops->init_dma_buf_io_ctx(bdev, ctx); } base-commit: 45b716456dd99488a0cef58482120dc0474aa696 -- 2.56.0