void fmap_unneed_off(fmap_t *m, size_t at, size_t len) {
unsigned int i, first_page, last_page;
if(m->dumb) return;
if(!len) {
cli_warnmsg("fmap_unneed: attempted void unneed\n");
return;
}
if(!CLI_ISCONTAINED(0, m->len, at, len)) {
cli_warnmsg("fmap: attempted oof unneed\n");
return;
}
first_page = fmap_which_page(m, at);
last_page = fmap_which_page(m, at + len - 1);
for(i=first_page; i<=last_page; i++) {
fmap_unneed_page(m, i);
}
}
static void handle_unneed_off(fmap_t *m, size_t at, size_t len) {
unsigned int i, first_page, last_page;
if(!m->aging) return;
if(!len) {
cli_warnmsg("fmap_unneed: attempted void unneed\n");
return;
}
at += m->nested_offset;
if(!CLI_ISCONTAINED(0, m->real_len, at, len)) {
cli_warnmsg("fmap: attempted oof unneed\n");
return;
}
first_page = fmap_which_page(m, at);
last_page = fmap_which_page(m, at + len - 1);
for(i=first_page; i<=last_page; i++) {
fmap_unneed_page(m, i);
}
}
static const void *handle_need_offstr(fmap_t *m, size_t at, size_t len_hint) {
unsigned int i, first_page, last_page;
void *ptr = (void *)((char *)m + m->hdrsz + at);
if(!len_hint || len_hint > m->real_len - at)
len_hint = m->real_len - at;
if(!CLI_ISCONTAINED(0, m->real_len, at, len_hint))
return NULL;
fmap_aging(m);
first_page = fmap_which_page(m, at);
last_page = fmap_which_page(m, at + len_hint - 1);
for(i=first_page; i<=last_page; i++) {
char *thispage = (char *)m + m->hdrsz + i * m->pgsz;
unsigned int scanat, scansz;
if(fmap_readpage(m, i, 1, 1)) {
last_page = i-1;
break;
}
if(i == first_page) {
scanat = at % m->pgsz;
scansz = MIN(len_hint, m->pgsz - scanat);
} else {
scanat = 0;
scansz = MIN(len_hint, m->pgsz);
}
len_hint -= scansz;
if(memchr(&thispage[scanat], 0, scansz))
return ptr;
}
for(i=first_page; i<=last_page; i++)
fmap_unneed_page(m, i);
return NULL;
}