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Thu, 29 Sep 2022 21:22:57 +0900 (KST) Received: from epsmtrp1.samsung.com (unknown [182.195.40.13]) by epcas5p4.samsung.com (KnoxPortal) with ESMTPA id 20220929121653epcas5p4ee82ef35b46d6686820dc4d870b6588e~ZU_zPDYV93131131311epcas5p4x; Thu, 29 Sep 2022 12:16:53 +0000 (GMT) Received: from epsmgms1p2.samsung.com (unknown [182.195.42.42]) by epsmtrp1.samsung.com (KnoxPortal) with ESMTP id 20220929121653epsmtrp146a3953021124a5b36115e448a9ac939~ZU_zN3BoZ1820918209epsmtrp1U; Thu, 29 Sep 2022 12:16:53 +0000 (GMT) X-AuditID: b6c32a4a-007ff70000019a35-0e-63358e2188fd Received: from epsmtip1.samsung.com ( [182.195.34.30]) by epsmgms1p2.samsung.com (Symantec Messaging Gateway) with SMTP id 03.3C.18644.5BC85336; Thu, 29 Sep 2022 21:16:53 +0900 (KST) Received: from localhost.localdomain (unknown [107.110.206.5]) by epsmtip1.samsung.com (KnoxPortal) with ESMTPA id 20220929121652epsmtip1b55397e978a4316537867fb857c255af~ZU_xupW4Q2919929199epsmtip1C; Thu, 29 Sep 2022 12:16:52 +0000 (GMT) From: Anuj Gupta 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, gost.dev@samsung.com, linux-scsi@vger.kernel.org, Kanchan Joshi , Anuj Gupta Subject: [PATCH for-next v11 07/13] block: add blk_rq_map_user_bvec Date: Thu, 29 Sep 2022 17:36:26 +0530 Message-Id: <20220929120632.64749-8-anuj20.g@samsung.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220929120632.64749-1-anuj20.g@samsung.com> MIME-Version: 1.0 X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprHJsWRmVeSWpSXmKPExsWy7bCmpq5in2mywZdnHBZNE/4yW6y+289m cfPATiaLlauPMlm8az3HYnH0/1s2i0mHrjFa7L2lbTF/2VN2i+7rO9gcuDwuny312LSqk81j 85J6j903G9g8+rasYvT4vEkugC0q2yYjNTEltUghNS85PyUzL91WyTs43jne1MzAUNfQ0sJc SSEvMTfVVsnFJ0DXLTMH6C4lhbLEnFKgUEBicbGSvp1NUX5pSapCRn5xia1SakFKToFJgV5x Ym5xaV66Xl5qiZWhgYGRKVBhQnZG/6WDrAVNIhUHvvg0MDYLdDFyckgImEg8PXqOrYuRi0NI YDejxObFC1ghnE+MEtvfHIfKfGaUWLPyBDNMS/ukSSwQiV2MEg8nLWcCSUBUfVMHsdkE1CWO PG9lBLFFBIwk9n86CTaWWeAmo0TzsX1gDcICzhJdf9aygdgsAqoS0zfNYu9i5ODgFbCU+DAn BWKZvMTMS9/ZQWxOASuJxdfmsILYvAKCEidnPmEBsZmBapq3zmYGmS8h0Mghsfb/cRaIZheJ +Y8fs0HYwhKvjm9hh7ClJF72t0HZ6RI/Lj9lgrALQG5jhLDtJVpP9TOD3MMsoCmxfpc+RFhW YuqpdUwQe/kken8/gWrlldgxD8ZWkmhfOQfKlpDYe66BCWSMhICHxMZ3+ZCg6mWUeHBUcQKj wiwk38xC8s0shMULGJlXMUqmFhTnpqcWmxYY5aWWw6M4OT93EyM4oWp57WB8+OCD3iFGJg7G Q4wSHMxKIrziBabJQrwpiZVVqUX58UWlOanFhxhNgaE9kVlKNDkfmNLzSuINTSwNTMzMzEws jc0MlcR5F8/QShYSSE8sSc1OTS1ILYLpY+LglGpgyv7b93LjZ86smuvhAn9kpau+CF88uv21 Gz/n3ZRtW/InN8l2X2H3+5L8jPlMnsstgcar7s2dXfOurLGL+ScSoL7tjsabF3ND/8zO3LrU 6XfU060fZWZr+vhruDfkaxSbTLaOdLYscmE1FGtq5br8QWzxzj2Pz+XFKt0NyrNmV0taeYsx 8uNlIc4+Rd/MzY+s9nzSs/VP/FjXbCQmnBkYU1ezy/z0scsL9JkDw26eEj2c1VDpdd+ppfqc AItTCndtwumtW4WfzOHUvHL8QvzxysmGk/5376nlqZxekSWtfvn6jFPnC56x3GOcbdpy1/Xe hyD5icZzLk3mD4tNrnwsFp79XbLw07TEaRe9LxcqsRRnJBpqMRcVJwIATLtwxjEEAAA= X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFrrCLMWRmVeSWpSXmKPExsWy7bCSnO7WHtNkg9XvNC2aJvxltlh9t5/N 4uaBnUwWK1cfZbJ413qOxeLo/7dsFpMOXWO02HtL22L+sqfsFt3Xd7A5cHlcPlvqsWlVJ5vH 5iX1HrtvNrB59G1ZxejxeZNcAFsUl01Kak5mWWqRvl0CV0b/pYOsBU0iFQe++DQwNgt0MXJy SAiYSLRPmsQCYgsJ7GCUODvdEiIuIXHq5TJGCFtYYuW/5+wQNR8ZJT5u8AGx2QTUJY48bwWr EREwk1h6eA3QHC4OZoH7jBJvm3eDDRUWcJbo+rOWDcRmEVCVmL5pFtAgDg5eAUuJD3NSIObL S8y89B1sPqeAlcTia3NYQUqEgEq231QACfMKCEqcnPkEbCIzUHnz1tnMExgFZiFJzUKSWsDI tIpRMrWgODc9t9iwwCgvtVyvODG3uDQvXS85P3cTIzjgtbR2MO5Z9UHvECMTB+MhRgkOZiUR XvEC02Qh3pTEyqrUovz4otKc1OJDjNIcLErivBe6TsYLCaQnlqRmp6YWpBbBZJk4OKUamDpv v17m0fjETqk0Wvl5I//txQqmNudU/rQr6OVX9ciVPMv5/+bX5hULQs4GnU277HjLhK0jYEqr yXuTb7Vq1vvdLudNOTB7YvkDGd6bK92v7ypqyl9ku7T/0JOS6zqd7wLuz5JYIF7g8/jm9b3J a1l6nR9eE+YKuFvH+fVMgse02q1fuZgPPry0d6fbqo8ph4Ua9oZfOibe9YdzjTpfeuXhi7Z7 mxbZF+dyvTls5eW7/I9iRMOhHXd/2AoVH3/b3TznanxrzJc/Uunr377MNH3iKr7DPv1hybGJ CZLlEisFI/JPrfrt0N1QGma1IWPiLMkPOouT3MQbHQ5sf/WwS93p/p6JdyJ7xHr+z1UrDlVi Kc5INNRiLipOBAAtRurN5wIAAA== X-CMS-MailID: 20220929121653epcas5p4ee82ef35b46d6686820dc4d870b6588e X-Msg-Generator: CA X-Sendblock-Type: REQ_APPROVE CMS-TYPE: 105P DLP-Filter: Pass X-CFilter-Loop: Reflected X-CMS-RootMailID: 20220929121653epcas5p4ee82ef35b46d6686820dc4d870b6588e References: <20220929120632.64749-1-anuj20.g@samsung.com> Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org From: Kanchan Joshi This is a prep patch. This function maps the pages from bvec iterator into a bio and place the bio into request. This helper will be used by nvme for uring-passthrough path when IO is done using pre-mapped buffers. Signed-off-by: Kanchan Joshi Signed-off-by: Anuj Gupta Suggested-by: Christoph Hellwig --- block/blk-map.c | 56 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 56 insertions(+) diff --git a/block/blk-map.c b/block/blk-map.c index 9e37a03b8a21..023b63ad06d8 100644 --- a/block/blk-map.c +++ b/block/blk-map.c @@ -548,6 +548,62 @@ int blk_rq_append_bio(struct request *rq, struct bio *bio) } EXPORT_SYMBOL(blk_rq_append_bio); +/* Prepare bio for passthrough IO given ITER_BVEC iter */ +static int blk_rq_map_user_bvec(struct request *rq, const struct iov_iter *iter) +{ + struct request_queue *q = rq->q; + size_t nr_iter = iov_iter_count(iter); + size_t nr_segs = iter->nr_segs; + struct bio_vec *bvecs, *bvprvp = NULL; + struct queue_limits *lim = &q->limits; + unsigned int nsegs = 0, bytes = 0; + struct bio *bio; + size_t i; + + if (!nr_iter || (nr_iter >> SECTOR_SHIFT) > queue_max_hw_sectors(q)) + return -EINVAL; + if (nr_segs > queue_max_segments(q)) + return -EINVAL; + + /* no iovecs to alloc, as we already have a BVEC iterator */ + bio = blk_rq_map_bio_alloc(rq, 0, GFP_KERNEL); + if (bio == NULL) + return -ENOMEM; + + bio_iov_bvec_set(bio, (struct iov_iter *)iter); + blk_rq_bio_prep(rq, bio, nr_segs); + + /* loop to perform a bunch of sanity checks */ + bvecs = (struct bio_vec *)iter->bvec; + for (i = 0; i < nr_segs; i++) { + struct bio_vec *bv = &bvecs[i]; + + /* + * If the queue doesn't support SG gaps and adding this + * offset would create a gap, fallback to copy. + */ + if (bvprvp && bvec_gap_to_prev(lim, bvprvp, bv->bv_offset)) { + blk_mq_map_bio_put(bio); + return -EREMOTEIO; + } + /* check full condition */ + if (nsegs >= nr_segs || bytes > UINT_MAX - bv->bv_len) + goto put_bio; + if (bytes + bv->bv_len > nr_iter) + goto put_bio; + if (bv->bv_offset + bv->bv_len > PAGE_SIZE) + goto put_bio; + + nsegs++; + bytes += bv->bv_len; + bvprvp = bv; + } + return 0; +put_bio: + blk_mq_map_bio_put(bio); + return -EINVAL; +} + /** * blk_rq_map_user_iov - map user data to a request, for passthrough requests * @q: request queue where request should be inserted