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More progress on copy_on_write().

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Copying phase is OK. Now writing the shadow collapse logic.
This commit is contained in:
Bahadir Balban
2008-03-09 00:19:55 +00:00
parent 7a54d722a7
commit ed23d82fd7
3 changed files with 194 additions and 59 deletions
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11
tasks/mm0/src/pagers.c
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@@ -80,6 +80,14 @@ struct page *file_page_in(struct vm_object *vm_obj, unsigned long page_offset)
void *vaddr, *paddr;
int err;
/* Check first if the file has such a page at all */
if (__pfn(page_align_up(f->length) <= page_offset)) {
printf("%s: %s: Trying to look up page %d, but file length "
"is %d bytes.\n", __TASKNAME__, __FUNCTION__,
page_offset, f->length);
BUG();
}
/* The page is not resident in page cache. */
if (!(page = find_page(vm_obj, page_offset))) {
/* Allocate a new page */
@@ -163,7 +171,8 @@ struct vm_swap_node {
*/
struct page *swap_page_in(struct vm_object *vm_obj, unsigned long file_offset)
{
BUG();
/* No swapping yet, so the page is either here or not here. */
return find_page(vm_obj, page_offset);
}
struct vm_pager swap_pager = {