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Tue, 29 Oct 2024 16:32:14 +0000 (GMT) Received: from epsmgms1p2new.samsung.com (unknown [182.195.42.42]) by epsmtrp1.samsung.com (KnoxPortal) with ESMTP id 20241029163214epsmtrp1c51dc3fc90333bdd1c5a8dcc372ba54f~C_X-vDYut0708307083epsmtrp1K; Tue, 29 Oct 2024 16:32:14 +0000 (GMT) X-AuditID: b6c32a49-0d5ff700000024cc-52-67211a15b45d Received: from epsmtip2.samsung.com ( [182.195.34.31]) by epsmgms1p2new.samsung.com (Symantec Messaging Gateway) with SMTP id D4.07.08227.E0E01276; Wed, 30 Oct 2024 01:32:14 +0900 (KST) Received: from localhost.localdomain (unknown [107.99.41.245]) by epsmtip2.samsung.com (KnoxPortal) with ESMTPA id 20241029163212epsmtip2c07a03b121b4c271c42f7bd3adf8681f~C_X9alVN10998409984epsmtip2W; Tue, 29 Oct 2024 16:32:12 +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 v5 02/10] block: copy back bounce buffer to user-space correctly in case of split Date: Tue, 29 Oct 2024 21:53:54 +0530 Message-Id: <20241029162402.21400-3-anuj20.g@samsung.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20241029162402.21400-1-anuj20.g@samsung.com> Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFrrJJsWRmVeSWpSXmKPExsWy7bCmpq6olGK6waXHkhYfv/5msWia8JfZ Ys6qbYwWq+/2s1m8PvyJ0eLmgZ1MFitXH2WyeNd6jsVi9vRmJotJh64xWuy9pW2xZ+9JFov5 y56yW3Rf38Fmsfz4PyaL83+Ps1qcnzWH3UHQY+esu+wel8+Wemxa1cnmsXlJvcfumw1sHh+f 3mLx6NuyitHjzIIj7B6fN8l5bHrylimAKyrbJiM1MSW1SCE1Lzk/JTMv3VbJOzjeOd7UzMBQ 19DSwlxJIS8xN9VWycUnQNctMwfoHSWFssScUqBQQGJxsZK+nU1RfmlJqkJGfnGJrVJqQUpO gUmBXnFibnFpXrpeXmqJlaGBgZEpUGFCdsajO2vZC87xVUzbcpulgXE9TxcjJ4eEgInE7J0r WboYuTiEBHYzSkzf+JkRwvnEKLHm4l5mCOcbo8SMXY9YYFp+P/nODpHYyyhxZeFpqP7PjBIP t79kBqliE1CXOPK8FWyWiMAeRoleqCpmgZeMEktXLQKbJSyQLDH71i+gDg4OFgFViecfC0DC vAKWEnf//IFaJy8x8xLIOk4OTgEriWNH9zBB1AhKnJz5BKyGGaimeetsZoj6CxwSzx4HQ9gu Epd6QB4CsYUlXh3fwg5hS0m87G+DstMlflx+ygRhF0g0H9sHVW8v0XqqH+w0ZgFNifW79CHC shJTT61jgljLJ9H7+wlUK6/EjnkwtpJE+8o5ULaExN5zDVC2h8Tuv2uggdXLKLHj/lHWCYwK s5C8MwvJO7MQVi9gZF7FKJlaUJybnlpsWmCYl1oOj+bk/NxNjOA0ruW5g/Hugw96hxiZOBgP MUpwMCuJ8K6OlU0X4k1JrKxKLcqPLyrNSS0+xGgKDO6JzFKiyfnATJJXEm9oYmlgYmZmZmJp bGaoJM77unVuipBAemJJanZqakFqEUwfEwenVANT3OdX668caFp2tfHbbul/Kb/Xs3b7vuNI 4YnYVhbYGtvak+r+54OMaFhv7cQajZA1gkd8a1v1eYQNlG4/mq2m/LbEbY6B4t0dYc96H8kt ZrL9dpV902bm1anZ85R7GkPiP3TEs/BLPvxbLLXfbbIej8sVG27XEqGC4x/PFioduf2nwrHp aeBy82m9VqmHJz3xFp7K0nz4YPwGlrp5p3/zi076XmnObKQ9V0numbqHoMfx37ruRa0LPkxJ iT9ncObW4+3Mf3bLmgYySBucmdrwz0+JY9Ks54zXrnVuPfD4bZr8TJ6Gmf4Bf748Dvx2Yvml O9//rw2dYJJjF5tp87ph3qtbRSukUqVi20zu/eJTYinOSDTUYi4qTgQA8EEGXmwEAAA= X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFupjkeLIzCtJLcpLzFFi42LZdlhJXpePTzHd4OMiZYuPX3+zWDRN+Mts MWfVNkaL1Xf72SxeH/7EaHHzwE4mi5WrjzJZvGs9x2Ixe3ozk8WkQ9cYLfbe0rbYs/cki8X8 ZU/ZLbqv72CzWH78H5PF+b/HWS3Oz5rD7iDosXPWXXaPy2dLPTat6mTz2Lyk3mP3zQY2j49P b7F49G1ZxehxZsERdo/Pm+Q8Nj15yxTAFcVlk5Kak1mWWqRvl8CV8ejOWvaCc3wV07bcZmlg XM/TxcjJISFgIvH7yXf2LkYuDiGB3YwSZyb/Y4RISEicerkMyhaWWPnvOVTRR0aJD9P62EES bALqEkeet4IViQicYJSYP9ENpIgZpGjCl9ksIAlhgUSJC3enANkcHCwCqhLPPxaAhHkFLCXu /vnDArFAXmLmpe9gMzkFrCSOHd3DBFIuBFRzcpIbRLmgxMmZT8DKmYHKm7fOZp7AKDALSWoW ktQCRqZVjJKpBcW56bnFhgVGeanlesWJucWleel6yfm5mxjBUaaltYNxz6oPeocYmTgYDzFK cDArifCujpVNF+JNSaysSi3Kjy8qzUktPsQozcGiJM777XVvipBAemJJanZqakFqEUyWiYNT qoHJ8c/HDRcuyYQZXO20c5sQdmHJz3JDY8fDJu2GP2a902toc9q78m3NSybVq1uDkzlrfbQF Mu5X67H/+h654cCFv1PPrG7m9t/5w/nJ/L7De9+kGe14dZ7P7Kjjfr2KeJaMA08+7Th/8Kj7 srw7XGpdZw/esX0if+ffHFNpaXf7E7+rjn3wtmaokCxMNZ86Vyhkfgab78H9+1517LK8YGmc f52Pf4fQnG47o7ZNybZXzu1U2i4m9nD/rSibGS0z27T+/JE2EnsW/59B45xKNuvz/87ZH2fZ Zr1fu/pGpY/1OcPKF01+q42kJsoqrNoQddDh6P5//qsj5FIKzq548HChhQ+vZu753U/nZdxy vvVUUYmlOCPRUIu5qDgRAL6ZvHUhAwAA X-CMS-MailID: 20241029163214epcas5p1069ca93a2a9d8840e4f142cc4b713775 X-Msg-Generator: CA X-Sendblock-Type: REQ_APPROVE CMS-TYPE: 105P DLP-Filter: Pass X-CFilter-Loop: Reflected X-CMS-RootMailID: 20241029163214epcas5p1069ca93a2a9d8840e4f142cc4b713775 References: <20241029162402.21400-1-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: Anuj Gupta [hch: better names for variables] Signed-off-by: Christoph Hellwig 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); } /**