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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@deltatee.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
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