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Fri, 23 Sep 2022 18:39:19 +0900 (KST) Received: from epsmtrp2.samsung.com (unknown [182.195.40.14]) by epcas5p3.samsung.com (KnoxPortal) with ESMTPA id 20220923093919epcas5p3d019fa1db990101478b8d6673ac0eaa6~Xc9gnKs1e3163431634epcas5p3a; Fri, 23 Sep 2022 09:39:19 +0000 (GMT) Received: from epsmgms1p1new.samsung.com (unknown [182.195.42.41]) by epsmtrp2.samsung.com (KnoxPortal) with ESMTP id 20220923093919epsmtrp2de633a6b235faa6f39e7ac3052b9e932~Xc9gmL5Nl1234812348epsmtrp2B; Fri, 23 Sep 2022 09:39:19 +0000 (GMT) X-AuditID: b6c32a4b-383ff7000001dc20-eb-632d7ec7f0a7 Received: from epsmtip2.samsung.com ( [182.195.34.31]) by epsmgms1p1new.samsung.com (Symantec Messaging Gateway) with SMTP id EE.FC.14392.7CE7D236; Fri, 23 Sep 2022 18:39:19 +0900 (KST) Received: from localhost.localdomain (unknown [107.110.206.5]) by epsmtip2.samsung.com (KnoxPortal) with ESMTPA id 20220923093917epsmtip2335f5313b422d05c042b329f3d1477e8~Xc9fFAO-X2705727057epsmtip29; Fri, 23 Sep 2022 09:39:17 +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, gost.dev@samsung.com, Kanchan Joshi , Anuj Gupta Subject: [PATCH for-next v8 4/5] block: add helper to map bvec iterator for passthrough Date: Fri, 23 Sep 2022 14:58:53 +0530 Message-Id: <20220923092854.5116-5-joshi.k@samsung.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220923092854.5116-1-joshi.k@samsung.com> MIME-Version: 1.0 X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFupjk+LIzCtJLcpLzFFi42LZdlhTQ/d4nW6ywa1DFhZNE/4yW6y+289m cfPATiaLlauPMlm8az3HYnH0/1s2i0mHrjFa7L2lbTF/2VN2B06Py2dLPTat6mTz2Lyk3mP3 zQY2j74tqxg9Pm+SC2CLyrbJSE1MSS1SSM1Lzk/JzEu3VfIOjneONzUzMNQ1tLQwV1LIS8xN tVVy8QnQdcvMATpJSaEsMacUKBSQWFyspG9nU5RfWpKqkJFfXGKrlFqQklNgUqBXnJhbXJqX rpeXWmJlaGBgZApUmJCdMeVlM1PBWvWKaQdfsDcwLpHvYuTkkBAwkVhw6x0riC0ksJtR4utC ri5GLiD7E6NEz/kJTBDON0aJzu/32WE6tjfMYoZI7GWU2PThLgtE+2dGicubYrsYOTjYBDQl LkwuBQmLCBhJ7P90khWknhlkw+q/b8HWCQtESizs+8wEYrMIqEqc33OcGcTmFTCXeHp2ATPE MnmJmZe+gy3mFLCQWLT5FhNEjaDEyZlPwPYyA9U0b50NdpCEwF92ibu3VkBd6iKxaMkqJghb WOLV8S1QcSmJz+/2skHYyRKXZp6DqimReLznIJRtL9F6qp8Z5BlmoGfW79KH2MUn0fv7CRNI WEKAV6KjTQiiWlHi3qSnrBC2uMTDGUugbA+Jm7e2skHCqptR4tqiy4wTGOVnIXlhFpIXZiFs W8DIvIpRMrWgODc9tdi0wDgvtRwer8n5uZsYwQlTy3sH46MHH/QOMTJxMB5ilOBgVhLhnX1H M1mINyWxsiq1KD++qDQntfgQoykwjCcyS4km5wNTdl5JvKGJpYGJmZmZiaWxmaGSOO/iGVrJ QgLpiSWp2ampBalFMH1MHJxSDUz7Vi474NtiXaIkUl/Kt+mDTkz76isZm1MefLqy+APXm3sr LwvsUjNpVTVo5XVUWT6fpeFZ0u2nTNdfvOvVZtWzuRvKH6oQfWZK8+M95y6Yy1dXy7pmme9d 1jvx2wrLPtG6G44MTSdfu8hxy8cwuy5n72HUX9gbzvHz0CSG17d1T9camb2Jbf3nG7Ov9edf zZ/zpsSucNU6HVjXMCsm+Inao4n3zdXMZUv8guLWXn6RNskx7UvvotJnz4pEij8oyDqsuaDi 1XNtY7DJNsE6hcSy4jTrOxymjrEFL9bYHPw2fVLu9Sjb4m5Z+Tfzi69e65Z9ahbL07V53dLC YN4nVTX3tVbpJXNWftqp7qk4R4mlOCPRUIu5qDgRAN5eKZIhBAAA X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFrrMLMWRmVeSWpSXmKPExsWy7bCSvO7xOt1kg8sXJC2aJvxltlh9t5/N 4uaBnUwWK1cfZbJ413qOxeLo/7dsFpMOXWO02HtL22L+sqfsDpwel8+Wemxa1cnmsXlJvcfu mw1sHn1bVjF6fN4kF8AWxWWTkpqTWZZapG+XwJUx5WUzU8Fa9YppB1+wNzAuke9i5OSQEDCR 2N4wi7mLkYtDSGA3o8TfD/NZIRLiEs3XfrBD2MISK/89Z4co+sgo0f2xm7GLkYODTUBT4sLk UpAaEQEziaWH17CA1DALHGSUON/0jQUkISwQLnH88A4mEJtFQFXi/J7jzCA2r4C5xNOzC5gh FshLzLz0HWwZp4CFxKLNt8DqhYBqflx6wQhRLyhxcuYTsJnMQPXNW2czT2AUmIUkNQtJagEj 0ypGydSC4tz03GLDAsO81HK94sTc4tK8dL3k/NxNjOBw19Lcwbh91Qe9Q4xMHIyHGCU4mJVE eGff0UwW4k1JrKxKLcqPLyrNSS0+xCjNwaIkznuh62S8kEB6YklqdmpqQWoRTJaJg1OqgWmS R81W02MJK/5dYvOJnMvV5+l0k9XdY+kvjZjl2t7LM5c575C6NjXX9Jr/rVrvU2vlbTR1m8O2 TU7K4yldO/+EFU/K7VVMVkKCKeal2m5MDvdeBzBt9dhyivNl12ULhodW5/I2MRW0Zci+O13f npnx7/Lvj6rWX9f3sbefjf35PWT6a2n2Za0M3ic+uX3ZKcOrwy4RpWXT/8x/v/XcStl3XhK7 j3REGmRn5+9dquMxLTbZX5TV8cvSI2FyG68t4jA+d9XywTrtLac/r/lVv+1qlGeXsPTfEx9W bYpL+bosxjTxe02s9veSrKe1d7ZyL5VM5FkZGzt90XamlMS90cr1Kw1fJR0v/nLN/7xVrhJL cUaioRZzUXEiABrJlgbmAgAA X-CMS-MailID: 20220923093919epcas5p3d019fa1db990101478b8d6673ac0eaa6 X-Msg-Generator: CA CMS-TYPE: 105P DLP-Filter: Pass X-CFilter-Loop: Reflected X-CMS-RootMailID: 20220923093919epcas5p3d019fa1db990101478b8d6673ac0eaa6 References: <20220923092854.5116-1-joshi.k@samsung.com> Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org Add blk_rq_map_user_bvec which maps the bvec iterator into a bio and places that into the request. This helper will be used in nvme for uring-passthrough with fixed-buffer. While at it, create another helper bio_map_get to reduce the code duplication. Signed-off-by: Kanchan Joshi Signed-off-by: Anuj Gupta --- block/blk-map.c | 111 +++++++++++++++++++++++++++++++++++++---- include/linux/blk-mq.h | 1 + 2 files changed, 102 insertions(+), 10 deletions(-) diff --git a/block/blk-map.c b/block/blk-map.c index 7693f8e3c454..d6265d49b15b 100644 --- a/block/blk-map.c +++ b/block/blk-map.c @@ -241,17 +241,10 @@ static void bio_map_put(struct bio *bio) } } -static int bio_map_user_iov(struct request *rq, struct iov_iter *iter, +static struct bio *bio_map_get(struct request *rq, unsigned int nr_vecs, gfp_t gfp_mask) { - unsigned int max_sectors = queue_max_hw_sectors(rq->q); - unsigned int nr_vecs = iov_iter_npages(iter, BIO_MAX_VECS); struct bio *bio; - int ret; - int j; - - if (!iov_iter_count(iter)) - return -EINVAL; if (rq->cmd_flags & REQ_POLLED) { blk_opf_t opf = rq->cmd_flags | REQ_ALLOC_CACHE; @@ -259,13 +252,31 @@ static int bio_map_user_iov(struct request *rq, struct iov_iter *iter, bio = bio_alloc_bioset(NULL, nr_vecs, opf, gfp_mask, &fs_bio_set); if (!bio) - return -ENOMEM; + return NULL; } else { bio = bio_kmalloc(nr_vecs, gfp_mask); if (!bio) - return -ENOMEM; + return NULL; bio_init(bio, NULL, bio->bi_inline_vecs, nr_vecs, req_op(rq)); } + return bio; +} + +static int bio_map_user_iov(struct request *rq, struct iov_iter *iter, + gfp_t gfp_mask) +{ + unsigned int max_sectors = queue_max_hw_sectors(rq->q); + unsigned int nr_vecs = iov_iter_npages(iter, BIO_MAX_VECS); + struct bio *bio; + int ret; + int j; + + if (!iov_iter_count(iter)) + return -EINVAL; + + bio = bio_map_get(rq, nr_vecs, gfp_mask); + if (bio == NULL) + return -ENOMEM; while (iov_iter_count(iter)) { struct page **pages, *stack_pages[UIO_FASTIOV]; @@ -611,6 +622,86 @@ 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 nr_iter, nr_segs, i; + struct bio *bio = NULL; + struct bio_vec *bv, *bvecs, *bvprvp = NULL; + struct queue_limits *lim = &q->limits; + unsigned int nsegs = 0, bytes = 0; + bool copy = false; + int ret; + unsigned long align = q->dma_pad_mask | queue_dma_alignment(q); + + /* see if we need to copy pages due to any weird situation */ + if (blk_queue_may_bounce(q)) + copy = true; + else if (iov_iter_alignment(iter) & align) + copy = true; + + if (copy) { + do { + ret = bio_copy_user_iov(rq, NULL, iter, GFP_KERNEL); + if (ret) { + blk_rq_unmap_user(bio); + rq->bio = NULL; + break; + } + if (!bio) + bio = rq->bio; + } while (iov_iter_count(iter)); + + return ret; + } + /* common (non-copy) case handling */ + nr_iter = iov_iter_count(iter); + nr_segs = iter->nr_segs; + + 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 = bio_map_get(rq, 0, GFP_KERNEL); + if (bio == NULL) + return -ENOMEM; + + bio_iov_bvec_set(bio, 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++) { + bv = &bvecs[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)) + goto put_bio; + + /* 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: + bio_map_put(bio); + return -EINVAL; +} +EXPORT_SYMBOL_GPL(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 00a15808c137..1a9ae17e49be 100644 --- a/include/linux/blk-mq.h +++ b/include/linux/blk-mq.h @@ -977,6 +977,7 @@ struct rq_map_data { bool from_user; }; +int blk_rq_map_user_bvec(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 *,