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);
}
}
/*
* 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;
}