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Mon, 05 Jan 2026 16:58:10 -0800 (PST) X-Relaying-Domain: purestorage.com Received: from dev-csander.dev.purestorage.com (dev-csander.dev.purestorage.com [10.49.34.222]) by c7-smtp-2023.dev.purestorage.com (Postfix) with ESMTP id 85E9A3421AE; Mon, 5 Jan 2026 17:58:09 -0700 (MST) Received: by dev-csander.dev.purestorage.com (Postfix, from userid 1557716354) id 77764E44554; Mon, 5 Jan 2026 17:58:09 -0700 (MST) From: Caleb Sander Mateos To: Ming Lei , Jens Axboe , Shuah Khan Cc: linux-block@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, Stanley Zhang , Uday Shankar , "Martin K . Petersen" , Caleb Sander Mateos Subject: [PATCH v3 09/19] ublk: implement integrity user copy Date: Mon, 5 Jan 2026 17:57:41 -0700 Message-ID: <20260106005752.3784925-10-csander@purestorage.com> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20260106005752.3784925-1-csander@purestorage.com> References: <20260106005752.3784925-1-csander@purestorage.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Stanley Zhang Add a function ublk_copy_user_integrity() to copy integrity information between a request and a user iov_iter. This mirrors the existing ublk_copy_user_pages() but operates on request integrity data instead of regular data. Check UBLKSRV_IO_INTEGRITY_FLAG in iocb->ki_pos in ublk_user_copy() to choose between copying data or integrity data. Signed-off-by: Stanley Zhang [csander: change offset units from data bytes to integrity data bytes, test UBLKSRV_IO_INTEGRITY_FLAG after subtracting UBLKSRV_IO_BUF_OFFSET, fix CONFIG_BLK_DEV_INTEGRITY=3Dn build, rebase on ublk user copy refactor] Signed-off-by: Caleb Sander Mateos --- drivers/block/ublk_drv.c | 52 +++++++++++++++++++++++++++++++++-- include/uapi/linux/ublk_cmd.h | 4 +++ 2 files changed, 53 insertions(+), 3 deletions(-) diff --git a/drivers/block/ublk_drv.c b/drivers/block/ublk_drv.c index e44ab9981ef4..9694a4c1caa7 100644 --- a/drivers/block/ublk_drv.c +++ b/drivers/block/ublk_drv.c @@ -621,10 +621,15 @@ static inline unsigned ublk_pos_to_tag(loff_t pos) { return ((pos - UBLKSRV_IO_BUF_OFFSET) >> UBLK_TAG_OFF) & UBLK_TAG_BITS_MASK; } =20 +static inline bool ublk_pos_is_integrity(loff_t pos) +{ + return !!((pos - UBLKSRV_IO_BUF_OFFSET) & UBLKSRV_IO_INTEGRITY_FLAG); +} + static void ublk_dev_param_basic_apply(struct ublk_device *ub) { const struct ublk_param_basic *p =3D &ub->params.basic; =20 if (p->attrs & UBLK_ATTR_READ_ONLY) @@ -1047,10 +1052,37 @@ static size_t ublk_copy_user_pages(const struct req= uest *req, break; } return done; } =20 +#ifdef CONFIG_BLK_DEV_INTEGRITY +static size_t ublk_copy_user_integrity(const struct request *req, + unsigned offset, struct iov_iter *uiter, int dir) +{ + size_t done =3D 0; + struct bio *bio =3D req->bio; + struct bvec_iter iter; + struct bio_vec iv; + + if (!blk_integrity_rq(req)) + return 0; + + bio_for_each_integrity_vec(iv, bio, iter) { + if (!ublk_copy_user_bvec(&iv, &offset, uiter, dir, &done)) + break; + } + + return done; +} +#else /* #ifdef CONFIG_BLK_DEV_INTEGRITY */ +static size_t ublk_copy_user_integrity(const struct request *req, + unsigned offset, struct iov_iter *uiter, int dir) +{ + return 0; +} +#endif /* #ifdef CONFIG_BLK_DEV_INTEGRITY */ + static inline bool ublk_need_map_req(const struct request *req) { return ublk_rq_has_data(req) && req_op(req) =3D=3D REQ_OP_WRITE; } =20 @@ -2654,10 +2686,12 @@ ublk_user_copy(struct kiocb *iocb, struct iov_iter = *iter, int dir) { struct ublk_device *ub =3D iocb->ki_filp->private_data; struct ublk_queue *ubq; struct request *req; struct ublk_io *io; + unsigned data_len; + bool is_integrity; size_t buf_off; u16 tag, q_id; ssize_t ret; =20 if (!user_backed_iter(iter)) @@ -2667,10 +2701,11 @@ ublk_user_copy(struct kiocb *iocb, struct iov_iter = *iter, int dir) return -EACCES; =20 tag =3D ublk_pos_to_tag(iocb->ki_pos); q_id =3D ublk_pos_to_hwq(iocb->ki_pos); buf_off =3D ublk_pos_to_buf_off(iocb->ki_pos); + is_integrity =3D ublk_pos_is_integrity(iocb->ki_pos); =20 if (q_id >=3D ub->dev_info.nr_hw_queues) return -EINVAL; =20 ubq =3D ublk_get_queue(ub, q_id); @@ -2683,21 +2718,31 @@ ublk_user_copy(struct kiocb *iocb, struct iov_iter = *iter, int dir) io =3D &ubq->ios[tag]; req =3D __ublk_check_and_get_req(ub, q_id, tag, io); if (!req) return -EINVAL; =20 - if (buf_off > blk_rq_bytes(req)) { + if (is_integrity) { + struct blk_integrity *bi =3D &req->q->limits.integrity; + + data_len =3D bio_integrity_bytes(bi, blk_rq_sectors(req)); + } else { + data_len =3D blk_rq_bytes(req); + } + if (buf_off > data_len) { ret =3D -EINVAL; goto out; } =20 if (!ublk_check_ubuf_dir(req, dir)) { ret =3D -EACCES; goto out; } =20 - ret =3D ublk_copy_user_pages(req, buf_off, iter, dir); + if (is_integrity) + ret =3D ublk_copy_user_integrity(req, buf_off, iter, dir); + else + ret =3D ublk_copy_user_pages(req, buf_off, iter, dir); =20 out: ublk_put_req_ref(io, req); return ret; } @@ -3931,11 +3976,12 @@ static struct miscdevice ublk_misc =3D { static int __init ublk_init(void) { int ret; =20 BUILD_BUG_ON((u64)UBLKSRV_IO_BUF_OFFSET + - UBLKSRV_IO_BUF_TOTAL_SIZE < UBLKSRV_IO_BUF_OFFSET); + UBLKSRV_IO_BUF_TOTAL_SIZE + + UBLKSRV_IO_INTEGRITY_FLAG < UBLKSRV_IO_BUF_OFFSET); BUILD_BUG_ON(sizeof(struct ublk_auto_buf_reg) !=3D 8); =20 init_waitqueue_head(&ublk_idr_wq); =20 ret =3D misc_register(&ublk_misc); diff --git a/include/uapi/linux/ublk_cmd.h b/include/uapi/linux/ublk_cmd.h index c1103ad5925b..3af7e3684834 100644 --- a/include/uapi/linux/ublk_cmd.h +++ b/include/uapi/linux/ublk_cmd.h @@ -132,10 +132,14 @@ #define UBLK_MAX_NR_QUEUES (1U << UBLK_QID_BITS) =20 #define UBLKSRV_IO_BUF_TOTAL_BITS (UBLK_QID_OFF + UBLK_QID_BITS) #define UBLKSRV_IO_BUF_TOTAL_SIZE (1ULL << UBLKSRV_IO_BUF_TOTAL_BITS) =20 +/* Copy to/from request integrity buffer instead of data buffer */ +#define UBLK_INTEGRITY_FLAG_OFF UBLKSRV_IO_BUF_TOTAL_BITS +#define UBLKSRV_IO_INTEGRITY_FLAG (1ULL << UBLK_INTEGRITY_FLAG_OFF) + /* * ublk server can register data buffers for incoming I/O requests with a = sparse * io_uring buffer table. The request buffer can then be used as the data = buffer * for io_uring operations via the fixed buffer index. * Note that the ublk server can never directly access the request data me= mory. --=20 2.45.2