int add_to_swap_cache(struct page *page, unsigned long entry)
{
#ifdef SWAP_CACHE_INFO
swap_cache_add_total++;
#endif
#ifdef DEBUG_SWAP
printk("DebugVM: add_to_swap_cache(%08lx count %d, entry %08lx)\n",
page_address(page), atomic_read(&page->count), entry);
#endif
if (PageTestandSetSwapCache(page)) {
printk(KERN_ERR "swap_cache: replacing non-empty entry %08lx "
"on page %08lx\n",
page->offset, page_address(page));
return 0;
}
if (page->inode) {
printk(KERN_ERR "swap_cache: replacing page-cached entry "
"on page %08lx\n", page_address(page));
return 0;
}
atomic_inc(&page->count);
page->inode = &swapper_inode;
page->offset = entry;
add_page_to_hash_queue(page, &swapper_inode, entry);
add_page_to_inode_queue(&swapper_inode, page);
return 1;
}
void add_to_swap_cache(struct page *page, swp_entry_t entry)
{
unsigned long flags;
#ifdef SWAP_CACHE_INFO
swap_cache_add_total++;
#endif
if (!PageLocked(page))
BUG();
if (PageTestandSetSwapCache(page))
BUG();
if (page->mapping)
BUG();
flags = page->flags & ~((1 << PG_error) | (1 << PG_arch_1));
page->flags = flags | (1 << PG_uptodate);
add_to_page_cache_locked(page, &swapper_space, entry.val);
}