Ejemplo n.º 1
0
int
uvm_objwire(struct uvm_object *uobj, voff_t start, voff_t end,
    struct pglist *pageq)
{
	int i, npages, left, error;
	struct vm_page *pgs[FETCH_PAGECOUNT];
	voff_t offset = start;

	left = (end - start) >> PAGE_SHIFT;

	while (left) {

		npages = MIN(FETCH_PAGECOUNT, left);

		/* Get the pages */
		memset(pgs, 0, sizeof(pgs));
		error = (*uobj->pgops->pgo_get)(uobj, offset, pgs, &npages, 0,
			PROT_READ | PROT_WRITE, MADV_SEQUENTIAL,
			PGO_ALLPAGES | PGO_SYNCIO);

		if (error)
			goto error;

		for (i = 0; i < npages; i++) {

			KASSERT(pgs[i] != NULL);
			KASSERT(!(pgs[i]->pg_flags & PG_RELEASED));

			if (pgs[i]->pg_flags & PQ_AOBJ) {
				atomic_clearbits_int(&pgs[i]->pg_flags,
				    PG_CLEAN);
				uao_dropswap(uobj, i);
			}
		}

		/* Wire the pages */
		uvm_lock_pageq();
		for (i = 0; i < npages; i++) {
			uvm_pagewire(pgs[i]);
			if (pageq != NULL)
				TAILQ_INSERT_TAIL(pageq, pgs[i], pageq);
		}
		uvm_unlock_pageq();

		/* Unbusy the pages */
		uvm_page_unbusy(pgs, npages);

		left -= npages;
		offset += (voff_t)npages << PAGE_SHIFT;
	}

	return 0;

error:
	/* Unwire the pages which have been wired */
	uvm_objunwire(uobj, start, offset);

	return error;
}
Ejemplo n.º 2
0
int
uvm_objwire(struct uvm_object *uobj, off_t start, off_t end,
    struct pglist *pageq)
{
	int i, npages, error;
	struct vm_page *pgs[FETCH_PAGECOUNT];
	off_t offset = start, left;

	left = (end - start) >> PAGE_SHIFT;

	mtx_enter(&uobj->vmobjlock);
	while (left) {

		npages = MIN(FETCH_PAGECOUNT, left);

		/* Get the pages */
		memset(pgs, 0, sizeof(pgs));
		error = (*uobj->pgops->pgo_get)(uobj, offset, pgs, &npages, 0,
			VM_PROT_READ | VM_PROT_WRITE, UVM_ADV_SEQUENTIAL,
			PGO_ALLPAGES | PGO_SYNCIO);

		if (error)
			goto error;

		mtx_enter(&uobj->vmobjlock);
		for (i = 0; i < npages; i++) {

			KASSERT(pgs[i] != NULL);
			KASSERT(!(pgs[i]->pg_flags & PG_RELEASED));

#if 0
			/*
			 * Loan break
			 */
			if (pgs[i]->loan_count) {
				while (pgs[i]->loan_count) {
					pg = uvm_loanbreak(pgs[i]);
					if (!pg) {
						mtx_leave(&uobj->vmobjlock);
						uvm_wait("uobjwirepg");
						mtx_enter(&uobj->vmobjlock);
						continue;
					}
				}
				pgs[i] = pg;
			}
#endif

			if (pgs[i]->pg_flags & PQ_AOBJ) {
				atomic_clearbits_int(&pgs[i]->pg_flags,
				    PG_CLEAN);
				uao_dropswap(uobj, i);
			}
		}

		/* Wire the pages */
		uvm_lock_pageq();
		for (i = 0; i < npages; i++) {
			uvm_pagewire(pgs[i]);
			if (pageq != NULL)
				TAILQ_INSERT_TAIL(pageq, pgs[i], pageq);
		}
		uvm_unlock_pageq();

		/* Unbusy the pages */
		uvm_page_unbusy(pgs, npages);

		left -= npages;
		offset += (off_t)npages << PAGE_SHIFT;
	}
	mtx_leave(&uobj->vmobjlock);

	return 0;

error:
	/* Unwire the pages which have been wired */
	uvm_objunwire(uobj, start, offset);

	return error;
}