static void client_free_pages(struct dm_kcopyd_client *kc)
{
BUG_ON(kc->nr_free_pages != kc->nr_pages);
drop_pages(kc->pages);
kc->pages = NULL;
kc->nr_free_pages = kc->nr_pages = 0;
}
static void free_bio_pages(struct cache_c *dmc)
{
BUG_ON(dmc->nr_free_pages != dmc->nr_pages);
drop_pages(dmc->pages);
dmc->pages = NULL;
dmc->nr_free_pages = dmc->nr_pages = 0;
}
static int client_alloc_pages(struct dm_kcopyd_client *kc, unsigned int nr)
{
unsigned int i;
struct page_list *pl = NULL, *next;
for (i = 0; i < nr; i++) {
next = alloc_pl();
if (!next) {
if (pl)
drop_pages(pl);
return -ENOMEM;
}
next->next = pl;
pl = next;
}
kcopyd_put_pages(kc, pl);
kc->nr_pages += nr;
return 0;
}
/*
* Allocate and reserve nr_pages for the use of a specific client.
*/
static int client_reserve_pages(struct dm_kcopyd_client *kc, unsigned nr_pages)
{
unsigned i;
struct page_list *pl = NULL, *next;
for (i = 0; i < nr_pages; i++) {
next = alloc_pl(GFP_KERNEL);
if (!next) {
if (pl)
drop_pages(pl);
return -ENOMEM;
}
next->next = pl;
pl = next;
}
kc->nr_reserved_pages += nr_pages;
kcopyd_put_pages(kc, pl);
return 0;
}
static int alloc_bio_pages(struct cache_c *dmc, unsigned int nr)
{
unsigned int i;
struct page_list *pl = NULL, *next;
for (i = 0; i < nr; i++) {
next = alloc_pl();
if (!next) {
if (pl)
drop_pages(pl);
return -ENOMEM;
}
next->next = pl;
pl = next;
}
kcached_put_pages(dmc, pl);
dmc->nr_pages += nr;
return 0;
}
