Exemple #1
0
void scatterwalk_copychunks(void *buf, struct scatter_walk *walk,
			    size_t nbytes, int out)
{
	for (;;) {
		unsigned int len_this_page = scatterwalk_pagelen(walk);
		u8 *vaddr;

		if (len_this_page > nbytes)
			len_this_page = nbytes;

		if (out != 2) {
			vaddr = scatterwalk_map(walk);
			memcpy_dir(buf, vaddr, len_this_page, out);
			scatterwalk_unmap(vaddr);
		}

		scatterwalk_advance(walk, len_this_page);

		if (nbytes == len_this_page)
			break;

		buf += len_this_page;
		nbytes -= len_this_page;

		scatterwalk_pagedone(walk, out & 1, 1);
	}
}
Exemple #2
0
/*
 * Do not call this unless the total length of all of the fragments
 * has been verified as multiple of the block size.
 */
int scatterwalk_copychunks(void *buf, struct scatter_walk *walk,
			   size_t nbytes, int out)
{
	if (buf != walk->data) {
		while (nbytes > walk->len_this_page) {
			memcpy_dir(buf, walk->data, walk->len_this_page, out);
			buf += walk->len_this_page;
			nbytes -= walk->len_this_page;

			crypto_kunmap(walk->data, out);
			scatterwalk_pagedone(walk, out, 1);
			scatterwalk_map(walk, out);
		}

		memcpy_dir(buf, walk->data, nbytes, out);
	}

	walk->offset += nbytes;
	walk->len_this_page -= nbytes;
	walk->len_this_segment -= nbytes;
	return 0;
}