All: We are using dm-crypt for Android device encryption. However, we need reserve some sectors in block device for status and integration check and do not want to encrypt/decrypt some sectors when using dm-crypt. So in crypt_convert_block() When offset sector of ctx + sector number of bio_in is the range of bypass sector list. instead call if (bio_data_dir(ctx->bio_in) == WRITE) r = crypt_copy_write_data(bv_in, bv_out, offset, 1 << SECTOR_SHIFT); else r = crypt_copy_read_data(bv_in, bv_out, offset, 1 << SECTOR_SHIFT); I want to call another function to copy data of a sector from ctx->bio_in to ctx->bio_out directly. I tried the following implementation 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 page * page_in = bv_in->bv_page; struct page * page_out = bv_out->bv_page; void * addr1 = kmap_atomic(page_in, KM_USER0); void * addr2 = kmap_atomic(page_out, KM_USER1); unsigned int offset = ctx->offset_in; memcpy(addr2 + offset, addr1 + offset, 1 << SECTOR_SHIFT); kunmap_atomic(addr2, KM_USER1); kunmap_atomic(addr1, KM_USER0); but above implementation does not work. Could you give me a kint to reslove this issue? Thanks Fan -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
