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Fri, 19 Aug 2022 19:40:42 +0900 (KST) Received: from epsmtrp1.samsung.com (unknown [182.195.40.13]) by epcas5p1.samsung.com (KnoxPortal) with ESMTPA id 20220819104042epcas5p177f384cd4c15918f666c7eacc4dfab4c~MuOHCpSKa0652106521epcas5p1v; Fri, 19 Aug 2022 10:40:42 +0000 (GMT) Received: from epsmgms1p2.samsung.com (unknown [182.195.42.42]) by epsmtrp1.samsung.com (KnoxPortal) with ESMTP id 20220819104042epsmtrp1ad49f1f504746d22c6b0f7358e4b0c0a~MuOHB57cr1513515135epsmtrp1I; Fri, 19 Aug 2022 10:40:42 +0000 (GMT) X-AuditID: b6c32a49-82dff7000000c145-83-62ff68aa7b76 Received: from epsmtip1.samsung.com ( [182.195.34.30]) by epsmgms1p2.samsung.com (Symantec Messaging Gateway) with SMTP id D9.85.08802.AA86FF26; Fri, 19 Aug 2022 19:40:42 +0900 (KST) Received: from localhost.localdomain (unknown [107.110.206.5]) by epsmtip1.samsung.com (KnoxPortal) with ESMTPA id 20220819104040epsmtip1bd7bae4cb87fe4a4ae49f8560660bba2~MuOE-h6LQ0577205772epsmtip1i; Fri, 19 Aug 2022 10:40:39 +0000 (GMT) From: Kanchan Joshi To: axboe@kernel.dk, hch@lst.de, kbusch@kernel.org Cc: io-uring@vger.kernel.org, linux-nvme@lists.infradead.org, linux-block@vger.kernel.org, ming.lei@redhat.com, gost.dev@samsung.com, Kanchan Joshi , Anuj Gupta Subject: [PATCH for-next 3/4] block: add helper to map bvec iterator for passthrough Date: Fri, 19 Aug 2022 16:00:20 +0530 Message-Id: <20220819103021.240340-4-joshi.k@samsung.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220819103021.240340-1-joshi.k@samsung.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprFJsWRmVeSWpSXmKPExsWy7bCmlu6qjP9JBs33LSyaJvxltlh9t5/N 4uaBnUwWK1cfZbJ413qOxeLo/7dsFpMOXWO02HtL22L+sqfsFocmNzM5cHlcPlvqsWlVJ5vH 5iX1HrtvNrB5vN93lc2jb8sqRo/Pm+QC2KOybTJSE1NSixRS85LzUzLz0m2VvIPjneNNzQwM dQ0tLcyVFPISc1NtlVx8AnTdMnOAjlNSKEvMKQUKBSQWFyvp29kU5ZeWpCpk5BeX2CqlFqTk FJgU6BUn5haX5qXr5aWWWBkaGBiZAhUmZGdceH2ZvWC1ZMWTW71sDYyTRLoYOTkkBEwkPh3c zNTFyMUhJLCbUaJly1k2COcTo8TjG7vYIZzPjBKbj65ig2mZdm0zI0RiF6PEprXzWOGqfl98 z9zFyMHBJqApcWFyKUiDiICRxP5PJ8FqmAUuMErc23mTBSQhLBAm8Wf3FkYQm0VAVeLF3tVg Nq+ApcSqbe+gtslLzLz0nR3E5hSwkpi19CobRI2gxMmZT8DmMAPVNG+dzQyyQEKgk0Ni9/YX LBDNLhJzNrewQtjCEq+Ob2GHsKUkXva3QdnJEpdmnmOCsEskHu85CGXbS7Se6gd7hhnomfW7 9CF28Un0/n7CBBKWEOCV6GgTgqhWlLg36SnUJnGJhzOWQNkeEle7VkCDtJdR4sbUHewTGOVn IXlhFpIXZiFsW8DIvIpRMrWgODc9tdi0wDAvtRwes8n5uZsYwYlUy3MH490HH/QOMTJxMB5i lOBgVhLhvXHnT5IQb0piZVVqUX58UWlOavEhRlNgGE9klhJNzgem8rySeEMTSwMTMzMzE0tj M0MlcV6vq5uShATSE0tSs1NTC1KLYPqYODilGpg4e1+tOWU15+nqpb/Yao+6/k02lI9sYl3y pLRKTH2iFeOUlnhr520c652srJxZhJrmuXj4fD9evH/1+p01h66qnOVrTReMf5/ffro04oXJ WYFOtg09BkGpBusOOK8Tczi6vvfpsf/rn/pcnuzi1Pudc1+TfdizEGa1uieF02+luHDcPfb3 8stC/UbGOrl9sz9ZMBzYeS9vka7y5UcPlzT8c5z08t9/S0lR0V/LZz4Ik8lxlDt64031st25 c6P0b6obtZ846B70M7IqKXKWp0dsfbliCJtc79LdGlJa3tZLNDYdON3QdnDJkcQVSyd6KR64 tSuPbfKFKNXZEjXFCw8u+db2KNwyJJ/xlN4x5ntKLMUZiYZazEXFiQBqWBkSLQQAAA== X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFrrLLMWRmVeSWpSXmKPExsWy7bCSnO6qjP9JBv8f8Fs0TfjLbLH6bj+b xc0DO5ksVq4+ymTxrvUci8XR/2/ZLCYdusZosfeWtsX8ZU/ZLQ5NbmZy4PK4fLbUY9OqTjaP zUvqPXbfbGDzeL/vKptH35ZVjB6fN8kFsEdx2aSk5mSWpRbp2yVwZVx4fZm9YLVkxZNbvWwN jJNEuhg5OSQETCSmXdvM2MXIxSEksINRYsHqdUwQCXGJ5ms/2CFsYYmV/56zQxR9ZJR48ukn kMPBwSagKXFhcilIjYiAmcTSw2tYQGqYBW4wSuzrnQI2SFggROLq+fdgg1gEVCVe7F3NCGLz ClhKrNr2jg1igbzEzEvfwWo4BawkZi29ChYXAqr59beDCaJeUOLkzCcsIDYzUH3z1tnMExgF ZiFJzUKSWsDItIpRMrWgODc9t9iwwCgvtVyvODG3uDQvXS85P3cTIzgGtLR2MO5Z9UHvECMT B+MhRgkOZiUR3ht3/iQJ8aYkVlalFuXHF5XmpBYfYpTmYFES573QdTJeSCA9sSQ1OzW1ILUI JsvEwSnVwCTmuaG7qiM7zunB9OhzLlWO+/NC7jSfytH9EX3/5rrnGzYrqh4L/q/D+HzpRnbV Z/2ni0MLn14SeJjG9+z+VYY7thNlJYWvLu5RURavkH+dduru9T7z78clGhl+pyy2jWg/F232 Iz1QurAm6SHD/R3Jib8sZig7/dn+9Qp/9NeM+nlzguV8umc65N17dEFgzaa+LzvlAjYZJTj+ jND+V2djkLdr9/Qa+wcbtM8UMzXP8mkUVlBIZ7Usc60Nn5Acf1lr8yw+k5ul8ySu3vvvGmle n332hhr7AfcOax4TkcTbbFEC4itWNOVE59SeW+Fk9UC59fs1N7+ZLwr0/razXuet3Ln13dzP pwstGyVWKrEUZyQaajEXFScCAH0cK9DwAgAA X-CMS-MailID: 20220819104042epcas5p177f384cd4c15918f666c7eacc4dfab4c X-Msg-Generator: CA Content-Type: text/plain; charset="utf-8" CMS-TYPE: 105P DLP-Filter: Pass X-CFilter-Loop: Reflected X-CMS-RootMailID: 20220819104042epcas5p177f384cd4c15918f666c7eacc4dfab4c References: <20220819103021.240340-1-joshi.k@samsung.com> Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org Add blk_rq_map_user_fixedb which maps the bvec iterator into a bio and places that into the request. This helper is to be used in nvme for uring-passthrough with fixed-buffer. Signed-off-by: Kanchan Joshi Signed-off-by: Anuj Gupta --- block/blk-map.c | 71 ++++++++++++++++++++++++++++++++++++++++++ include/linux/blk-mq.h | 1 + 2 files changed, 72 insertions(+) diff --git a/block/blk-map.c b/block/blk-map.c index d0ff80a9902e..ee17cc78bf00 100644 --- a/block/blk-map.c +++ b/block/blk-map.c @@ -611,6 +611,77 @@ int blk_rq_map_user(struct request_queue *q, struct request *rq, } EXPORT_SYMBOL(blk_rq_map_user); +/* Prepare bio for passthrough IO given an existing bvec iter */ +int blk_rq_map_user_bvec(struct request *rq, struct iov_iter *iter) +{ + struct request_queue *q = rq->q; + size_t iter_count, nr_segs; + struct bio *bio; + struct bio_vec *bv, *bvec_arr, *bvprvp = NULL; + struct queue_limits *lim = &q->limits; + unsigned int nsegs = 0, bytes = 0; + int ret, i; + + iter_count = iov_iter_count(iter); + nr_segs = iter->nr_segs; + + if (!iter_count || (iter_count >> 9) > queue_max_hw_sectors(q)) + return -EINVAL; + if (nr_segs > queue_max_segments(q)) + return -EINVAL; + if (rq->cmd_flags & REQ_POLLED) { + blk_opf_t opf = rq->cmd_flags | REQ_ALLOC_CACHE; + + /* no iovecs to alloc, as we already have a BVEC iterator */ + bio = bio_alloc_bioset(NULL, 0, opf, GFP_KERNEL, + &fs_bio_set); + if (!bio) + return -ENOMEM; + } else { + bio = bio_kmalloc(0, GFP_KERNEL); + if (!bio) + return -ENOMEM; + bio_init(bio, NULL, bio->bi_inline_vecs, 0, req_op(rq)); + } + bio_iov_bvec_set(bio, iter); + blk_rq_bio_prep(rq, bio, nr_segs); + + /* loop to perform a bunch of sanity checks */ + bvec_arr = (struct bio_vec *)iter->bvec; + for (i = 0; i < nr_segs; i++) { + bv = &bvec_arr[i]; + /* + * If the queue doesn't support SG gaps and adding this + * offset would create a gap, disallow it. + */ + if (bvprvp && bvec_gap_to_prev(lim, bvprvp, bv->bv_offset)) { + ret = -EINVAL; + goto out_free; + } + + /* check full condition */ + if (nsegs >= nr_segs || bytes > UINT_MAX - bv->bv_len) { + ret = -EINVAL; + goto out_free; + } + + if (bytes + bv->bv_len <= iter_count && + bv->bv_offset + bv->bv_len <= PAGE_SIZE) { + nsegs++; + bytes += bv->bv_len; + } else { + ret = -EINVAL; + goto out_free; + } + bvprvp = bv; + } + return 0; +out_free: + bio_map_put(bio); + return ret; +} +EXPORT_SYMBOL(blk_rq_map_user_bvec); + /** * blk_rq_unmap_user - unmap a request with user data * @bio: start of bio list diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h index 9d1af7a0a401..a7c9c836d2f3 100644 --- a/include/linux/blk-mq.h +++ b/include/linux/blk-mq.h @@ -971,6 +971,7 @@ struct rq_map_data { bool from_user; }; +int blk_rq_map_user_fixedb(struct request *rq, struct iov_iter *iter); int blk_rq_map_user(struct request_queue *, struct request *, struct rq_map_data *, void __user *, unsigned long, gfp_t); int blk_rq_map_user_iov(struct request_queue *, struct request *, -- 2.25.1