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Towards sys_close()/sys_flush()

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This commit is contained in:
Bahadir Balban
2008-04-25 22:14:59 +01:00
parent 488d9e6271
commit c9b9f9d111
3 changed files with 106 additions and 31 deletions
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43
tasks/mm0/src/pagers.c
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@@ -61,6 +61,48 @@ int default_release_pages(struct vm_object *vm_obj)
return 0;
}
int file_page_out(struct vm_object *vm_obj, unsigned long page_offset)
{
struct vm_file *f = vm_object_to_file(vm_obj);
struct page *page;
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();
}
/* If the page is not in the page cache, simply return. */
if (!(page = find_page(vm_obj, page_offset)))
return 0;
/* If the page is not dirty, simply return */
if (!(page->flags & VM_DIRTY))
return 0;
/* Map the page to vfs task */
l4_map(paddr, vaddr, 1, MAP_USR_RW_FLAGS, VFS_TID);
/* Syscall to vfs to read into the page. */
if ((err = vfs_write(vm_file_to_vnum(f), page_offset, 1, vaddr)) < 0)
goto out_err;
/* Unmap it from vfs */
l4_unmap(vaddr, 1, VFS_TID);
/* Update page details */
page->flags &= ~VM_DIRTY;
return 0;
out_err:
l4_unmap(vaddr, 1, VFS_TID);
return err;
}
struct page *file_page_in(struct vm_object *vm_obj, unsigned long page_offset)
{
@@ -125,6 +167,7 @@ out_err:
struct vm_pager file_pager = {
.ops = {
.page_in = file_page_in,
.page_out = file_page_out,
.release_pages = default_release_pages,
},
};