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Wed, 6 Nov 2024 12:26:59 +0000 (GMT) Received: from epsmgmc1p1new.samsung.com (unknown [182.195.42.40]) by epsmtrp2.samsung.com (KnoxPortal) with ESMTP id 20241106122659epsmtrp25d9dbd51809b4af77c8f8fd43592fb90~FYMI7psJw2560925609epsmtrp27; Wed, 6 Nov 2024 12:26:59 +0000 (GMT) X-AuditID: b6c32a4b-4a7fa70000002648-14-672b7d189239 Received: from epsmtip1.samsung.com ( [182.195.34.30]) by epsmgmc1p1new.samsung.com (Symantec Messaging Gateway) with SMTP id D6.26.07371.2906B276; Wed, 6 Nov 2024 21:26:59 +0900 (KST) Received: from localhost.localdomain (unknown [107.99.41.245]) by epsmtip1.samsung.com (KnoxPortal) with ESMTPA id 20241106122656epsmtip15daa342826f8e12932f9a06f871347b8~FYMGmHqSV0829608296epsmtip1p; Wed, 6 Nov 2024 12:26:56 +0000 (GMT) From: Anuj Gupta To: axboe@kernel.dk, hch@lst.de, kbusch@kernel.org, martin.petersen@oracle.com, asml.silence@gmail.com, anuj1072538@gmail.com, brauner@kernel.org, jack@suse.cz, viro@zeniv.linux.org.uk 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, vishak.g@samsung.com, linux-fsdevel@vger.kernel.org, Anuj Gupta Subject: [PATCH v8 02/10] block: copy back bounce buffer to user-space correctly in case of split Date: Wed, 6 Nov 2024 17:48:34 +0530 Message-Id: <20241106121842.5004-3-anuj20.g@samsung.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20241106121842.5004-1-anuj20.g@samsung.com> Precedence: bulk X-Mailing-List: linux-scsi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFrrNJsWRmVeSWpSXmKPExsWy7bCmpq5ErXa6wbGTHBYfv/5msWia8JfZ Ys6qbYwWq+/2s1m8PvyJ0eLmgZ1MFitXH2WyeNd6jsVi9vRmJotJh64xWuy9pW2xZ+9JFov5 y56yW3Rf38Fmsfz4PyaL83+Ps1qcnzWH3UHQY+esu+wel8+Wemxa1cnmsXlJvcfumw1sHh+f 3mLx6NuyitHjzIIj7B6fN8l5bHrylimAKyrbJiM1MSW1SCE1Lzk/JTMv3VbJOzjeOd7UzMBQ 19DSwlxJIS8xN9VWycUnQNctMwfoHSWFssScUqBQQGJxsZK+nU1RfmlJqkJGfnGJrVJqQUpO gUmBXnFibnFpXrpeXmqJlaGBgZEpUGFCdsbn2U1MBav5KlY1TGNrYJzE08XIySEhYCLRMHsr YxcjF4eQwG5GiUlPPkI5nxglfs67ygzhfGOUWHR6CRtMy5oLa1khEnsZJdbf+8gO4XxmlHg7 bSYjSBWbgLrEkeetYLNEBPYwSvQuPM0C4jALvGSUWLpqEQtIlbBAssTvf3/AOlgEVCVubJzH BGLzClhI3Py+hAVin7zEzEvf2UFsTgFLibOftzFC1AhKnJz5BKyGGaimeetssGMlBC5wSDz/ cxnqWBeJa+d3M0LYwhKvjm9hh7ClJD6/2wtVky7x4/JTJgi7QKL52D6oenuJ1lP9QEM5gBZo SqzfpQ8RlpWYemodE8RePone30+gWnkldsyDsZUk2lfOgbIlJPaea4CyPSRunGhmggRXD6PE nueXWCcwKsxC8s8sJP/MQli9gJF5FaNkakFxbnpqsWmBcV5qOTyik/NzNzGCU7mW9w7GRw8+ 6B1iZOJgPMQowcGsJMLrH6WdLsSbklhZlVqUH19UmpNafIjRFBjgE5mlRJPzgdkkryTe0MTS wMTMzMzE0tjMUEmc93Xr3BQhgfTEktTs1NSC1CKYPiYOTqkGJsGXUtO3uixsTpL+VyPWP7Fr r9iOPo0fdVacOwxarq1mLXl5v6q+2k82dSGvTnqed+bk+f3M19TiTVasPbP68er+e1LlFzQ0 dV9P3yOaHOS99vMOa+3mvLVRF1c+X9pdzv3IfWmDpvjyzydtTVLmruF4WHp1mdJ3TuUbZybN PiP6pNx7oW/DuUu3a45uTXHee2YDk8yrUvEZS05p5hbM3H77aE+IkGnge3FzAZvLR/q3XN2q LCjX1Gx5ar2n7bVltr+44zaGLlhr0L9sxXMB9RWXemuO29bvLVF9/T9B+es1j5h3Lqp/hMWX 7GeIvziryun++QUlO04FhZw/w5tx+V2uf9t8oxYvNdY7vrs6HymxFGckGmoxFxUnAgCxsso/ bgQAAA== X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprAIsWRmVeSWpSXmKPExsWy7bCSnO7kBO10g6lzGS0+fv3NYtE04S+z xZxV2xgtVt/tZ7N4ffgTo8XNAzuZLFauPspk8a71HIvF7OnNTBaTDl1jtNh7S9tiz96TLBbz lz1lt+i+voPNYvnxf0wW5/8eZ7U4P2sOu4Ogx85Zd9k9Lp8t9di0qpPNY/OSeo/dNxvYPD4+ vcXi0bdlFaPHmQVH2D0+b5Lz2PTkLVMAVxSXTUpqTmZZapG+XQJXxufZTUwFq/kqVjVMY2tg nMTTxcjJISFgIrHmwlrWLkYuDiGB3YwSJ7d/ZoNISEicermMEcIWllj57zk7RNFHRom12xey giTYBNQljjxvBSsSETjBKDF/ohtIETNI0YQvs1lAEsICiRIXVn0Fm8oioCpxY+M8JhCbV8BC 4ub3JSwQG+QlZl76zg5icwpYSpz9vA1sqBBQzZ8FfcwQ9YISJ2c+AatnBqpv3jqbeQKjwCwk qVlIUgsYmVYxSqYWFOem5yYbFhjmpZbrFSfmFpfmpesl5+duYgRHmpbGDsZ78//pHWJk4mA8 xCjBwawkwusfpZ0uxJuSWFmVWpQfX1Sak1p8iFGag0VJnNdwxuwUIYH0xJLU7NTUgtQimCwT B6dUA1PwK7FrMzrjHZkk23aqRClUnHgwvXMPz+SspQeUE1fKRyYzKMnyHvT3nr1jNnsnL/P6 tUvCpZcURrddXLo34u7j11G2s7sel+/8vqJhcRyXsdyrTa+vvKrbuM1XUCNMOLng0OOumA9N PAtbUsSn/hU3vSsRsHDt3CVV+RfnL8nhYQsy+ffs362XBwXnax9IUr3fKyXaY/Pioa/yy+Jo YYeipgvNipyv1MunifCLfy1qPJ7/yf1eLJPKzEPy/1iV7GpXe/n55Thdlp297rpE3JfQJ2mO 24zaNime0Hs3kcWzoOThypTd0w7aOeYZf5hrkFnk8ePBth8h7x53/+gOS93QPbdxwpakr9xa tbZPtJRYijMSDbWYi4oTAVSSS2ojAwAA X-CMS-MailID: 20241106122659epcas5p28505a2288f3ac24408aaf138ac053793 X-Msg-Generator: CA X-Sendblock-Type: REQ_APPROVE CMS-TYPE: 105P DLP-Filter: Pass X-CFilter-Loop: Reflected X-CMS-RootMailID: 20241106122659epcas5p28505a2288f3ac24408aaf138ac053793 References: <20241106121842.5004-1-anuj20.g@samsung.com> From: Christoph Hellwig Copy back the bounce buffer to user-space in entirety when the parent bio completes. The existing code uses bip_iter.bi_size for sizing the copy, which can be modified. So move away from that and fetch it from the vector passed to the block layer. While at it, switch to using better variable names. Fixes: 492c5d455969f ("block: bio-integrity: directly map user buffers") Signed-off-by: Christoph Hellwig Signed-off-by: Anuj Gupta Reviewed-by: Keith Busch --- block/bio-integrity.c | 15 ++++++++------- 1 file changed, 8 insertions(+), 7 deletions(-) diff --git a/block/bio-integrity.c b/block/bio-integrity.c index a448a25d13de..4341b0d4efa1 100644 --- a/block/bio-integrity.c +++ b/block/bio-integrity.c @@ -118,17 +118,18 @@ static void bio_integrity_unpin_bvec(struct bio_vec *bv, int nr_vecs, static void bio_integrity_uncopy_user(struct bio_integrity_payload *bip) { - unsigned short nr_vecs = bip->bip_max_vcnt - 1; - struct bio_vec *copy = &bip->bip_vec[1]; - size_t bytes = bip->bip_iter.bi_size; - struct iov_iter iter; + unsigned short orig_nr_vecs = bip->bip_max_vcnt - 1; + struct bio_vec *orig_bvecs = &bip->bip_vec[1]; + struct bio_vec *bounce_bvec = &bip->bip_vec[0]; + size_t bytes = bounce_bvec->bv_len; + struct iov_iter orig_iter; int ret; - iov_iter_bvec(&iter, ITER_DEST, copy, nr_vecs, bytes); - ret = copy_to_iter(bvec_virt(bip->bip_vec), bytes, &iter); + iov_iter_bvec(&orig_iter, ITER_DEST, orig_bvecs, orig_nr_vecs, bytes); + ret = copy_to_iter(bvec_virt(bounce_bvec), bytes, &orig_iter); WARN_ON_ONCE(ret != bytes); - bio_integrity_unpin_bvec(copy, nr_vecs, true); + bio_integrity_unpin_bvec(orig_bvecs, orig_nr_vecs, true); } /**