Hi,
I am reading 2.4.16, let us assume following scenario
swap_map[offset] == 2;
and page->count == 2; (before function execution)
vm_swap is full (nr_swap_pages*2 > total_swap_pages);
first question is the above case possible.
if yes,
then
after execution of this function, we would have page->count == 1, i.e.
mapped by some process, with good page->index and what we have is, the
associated
swap entry is already freed.
Am i wrong somewhere ??
-----
Amol
void free_swap_and_cache(swp_entry_t entry)
{
struct swap_info_struct * p;
struct page *page = NULL;
p = swap_info_get(entry);
if (p) {
if (swap_entry_free(p, SWP_OFFSET(entry)) == 1)
page = find_trylock_page(&swapper_space, entry.val);
swap_info_put(p);
}
if (page) {
page_cache_get(page);
/* Only cache user (+us), or swap space full? Free it! */
if (page_count(page) == 2 || vm_swap_full()) {
delete_from_swap_cache(page);
SetPageDirty(page);
}
UnlockPage(page);
page_cache_release(page);
}
}
?
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