netdev - [PATCH 09/22] dm-crypt: Make use of the new sg

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Date:   Thu, 13 Apr 2017 16:05:22 -0600
From:   Logan Gunthorpe <logang@...tatee.com>
To:     Christoph Hellwig <hch@....de>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Sagi Grimberg <sagi@...mberg.me>, Jens Axboe <axboe@...nel.dk>,
        Tejun Heo <tj@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Ross Zwisler <ross.zwisler@...ux.intel.com>,
        Matthew Wilcox <mawilcox@...rosoft.com>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Ming Lin <ming.l@....samsung.com>,
        linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
        linux-media@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linaro-mm-sig@...ts.linaro.org, intel-gfx@...ts.freedesktop.org,
        linux-raid@...r.kernel.org, linux-mmc@...r.kernel.org,
        linux-nvme@...ts.infradead.org, linux-nvdimm@...ts.01.org,
        linux-scsi@...r.kernel.org, fcoe-devel@...n-fcoe.org,
        open-iscsi@...glegroups.com, megaraidlinux.pdl@...adcom.com,
        sparmaintainer@...sys.com, devel@...verdev.osuosl.org,
        target-devel@...r.kernel.org, netdev@...r.kernel.org,
        linux-rdma@...r.kernel.org, rds-devel@....oracle.com
Cc:     Steve Wise <swise@...ngridcomputing.com>,
        Stephen Bates <sbates@...thlin.com>,
        Logan Gunthorpe <logang@...tatee.com>
Subject: [PATCH 09/22] dm-crypt: Make use of the new sg_map helper in 4 call sites

Very straightforward conversion to the new function in all four spots.

Signed-off-by: Logan Gunthorpe <logang@...tatee.com>
---
 drivers/md/dm-crypt.c | 38 +++++++++++++++++++++++++-------------
 1 file changed, 25 insertions(+), 13 deletions(-)

diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c
index 389a363..6bd0ffc 100644
--- a/drivers/md/dm-crypt.c
+++ b/drivers/md/dm-crypt.c
@@ -589,9 +589,12 @@ static int crypt_iv_lmk_gen(struct crypt_config *cc, u8 *iv,
 	int r = 0;
 
 	if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) {
-		src = kmap_atomic(sg_page(&dmreq->sg_in));
-		r = crypt_iv_lmk_one(cc, iv, dmreq, src + dmreq->sg_in.offset);
-		kunmap_atomic(src);
+		src = sg_map(&dmreq->sg_in, SG_KMAP_ATOMIC);
+		if (IS_ERR(src))
+			return PTR_ERR(src);
+
+		r = crypt_iv_lmk_one(cc, iv, dmreq, src);
+		sg_unmap(&dmreq->sg_in, src, SG_KMAP_ATOMIC);
 	} else
 		memset(iv, 0, cc->iv_size);
 
@@ -607,14 +610,17 @@ static int crypt_iv_lmk_post(struct crypt_config *cc, u8 *iv,
 	if (bio_data_dir(dmreq->ctx->bio_in) == WRITE)
 		return 0;
 
-	dst = kmap_atomic(sg_page(&dmreq->sg_out));
-	r = crypt_iv_lmk_one(cc, iv, dmreq, dst + dmreq->sg_out.offset);
+	dst = sg_map(&dmreq->sg_out, SG_KMAP_ATOMIC);
+	if (IS_ERR(dst))
+		return PTR_ERR(dst);
+
+	r = crypt_iv_lmk_one(cc, iv, dmreq, dst);
 
 	/* Tweak the first block of plaintext sector */
 	if (!r)
-		crypto_xor(dst + dmreq->sg_out.offset, iv, cc->iv_size);
+		crypto_xor(dst, iv, cc->iv_size);
 
-	kunmap_atomic(dst);
+	sg_unmap(&dmreq->sg_out, dst, SG_KMAP_ATOMIC);
 	return r;
 }
 
@@ -731,9 +737,12 @@ static int crypt_iv_tcw_gen(struct crypt_config *cc, u8 *iv,
 
 	/* Remove whitening from ciphertext */
 	if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) {
-		src = kmap_atomic(sg_page(&dmreq->sg_in));
-		r = crypt_iv_tcw_whitening(cc, dmreq, src + dmreq->sg_in.offset);
-		kunmap_atomic(src);
+		src = sg_map(&dmreq->sg_in, SG_KMAP_ATOMIC);
+		if (IS_ERR(src))
+			return PTR_ERR(src);
+
+		r = crypt_iv_tcw_whitening(cc, dmreq, src);
+		sg_unmap(&dmreq->sg_in, src, SG_KMAP_ATOMIC);
 	}
 
 	/* Calculate IV */
@@ -755,9 +764,12 @@ static int crypt_iv_tcw_post(struct crypt_config *cc, u8 *iv,
 		return 0;
 
 	/* Apply whitening on ciphertext */
-	dst = kmap_atomic(sg_page(&dmreq->sg_out));
-	r = crypt_iv_tcw_whitening(cc, dmreq, dst + dmreq->sg_out.offset);
-	kunmap_atomic(dst);
+	dst = sg_map(&dmreq->sg_out, SG_KMAP_ATOMIC);
+	if (IS_ERR(dst))
+		return PTR_ERR(dst);
+
+	r = crypt_iv_tcw_whitening(cc, dmreq, dst);
+	sg_unmap(&dmreq->sg_out, dst, SG_KMAP_ATOMIC);
 
 	return r;
 }
-- 
2.1.4