+ ctx->bio_in = bio_in;
+ ctx->bio_out = bio_out;
+ ctx->offset_in = 0;
+ ctx->offset_out = 0;
+ ctx->idx_in = bio_in ? bio_in->bi_idx : 0;
+ ctx->idx_out = bio_out ? bio_out->bi_idx : 0;
+ ctx->sector = sector + cc->iv_offset;
+ init_completion(&ctx->restart);
+}
+
+static struct dm_crypt_request *dmreq_of_req(struct crypt_config *cc,
+ struct ablkcipher_request *req)
+{
+ return (struct dm_crypt_request *)((char *)req + cc->dmreq_start);
+}
+
+static struct ablkcipher_request *req_of_dmreq(struct crypt_config *cc,
+ struct dm_crypt_request *dmreq)
+{
+ return (struct ablkcipher_request *)((char *)dmreq - cc->dmreq_start);
+}
+
+static int crypt_convert_block(struct crypt_config *cc,
+ struct convert_context *ctx,
+ struct ablkcipher_request *req)
+{
+ struct bio_vec *bv_in = bio_iovec_idx(ctx->bio_in, ctx->idx_in);
+ struct bio_vec *bv_out = bio_iovec_idx(ctx->bio_out, ctx->idx_out);
+ struct dm_crypt_request *dmreq;
+ u8 *iv;
+ int r = 0;
+
+ dmreq = dmreq_of_req(cc, req);
+ iv = (u8 *)ALIGN((unsigned long)(dmreq + 1),
+ crypto_ablkcipher_alignmask(cc->tfm) + 1);
+
+ dmreq->ctx = ctx;
+ sg_init_table(&dmreq->sg_in, 1);
+ sg_set_page(&dmreq->sg_in, bv_in->bv_page, 1 << SECTOR_SHIFT,
+ bv_in->bv_offset + ctx->offset_in);
+
+ sg_init_table(&dmreq->sg_out, 1);
+ sg_set_page(&dmreq->sg_out, bv_out->bv_page, 1 << SECTOR_SHIFT,
+ bv_out->bv_offset + ctx->offset_out);
+
+ ctx->offset_in += 1 << SECTOR_SHIFT;
+ if (ctx->offset_in >= bv_in->bv_len) {
+ ctx->offset_in = 0;
+ ctx->idx_in++;
+ }
+
+ ctx->offset_out += 1 << SECTOR_SHIFT;
+ if (ctx->offset_out >= bv_out->bv_len) {
+ ctx->offset_out = 0;
+ ctx->idx_out++;
+ }