vm_page.c (e532a99901e26d3961f8f5c0e4969fce86f09456) vm_page.c (0fd977b3fa32d54b61554416363faae8a7bfaa2b)
1/*-
2 * SPDX-License-Identifier: (BSD-3-Clause AND MIT-CMU)
3 *
4 * Copyright (c) 1991 Regents of the University of California.
5 * All rights reserved.
6 * Copyright (c) 1998 Matthew Dillon. All Rights Reserved.
7 *
8 * This code is derived from software contributed to Berkeley by

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1453 if (pmap_page_is_write_mapped(m))
1454 vm_object_set_writeable_dirty(object);
1455}
1456
1457/*
1458 * vm_page_remove:
1459 *
1460 * Removes the specified page from its containing object, but does not
1/*-
2 * SPDX-License-Identifier: (BSD-3-Clause AND MIT-CMU)
3 *
4 * Copyright (c) 1991 Regents of the University of California.
5 * All rights reserved.
6 * Copyright (c) 1998 Matthew Dillon. All Rights Reserved.
7 *
8 * This code is derived from software contributed to Berkeley by

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1453 if (pmap_page_is_write_mapped(m))
1454 vm_object_set_writeable_dirty(object);
1455}
1456
1457/*
1458 * vm_page_remove:
1459 *
1460 * Removes the specified page from its containing object, but does not
1461 * invalidate any backing storage.
1461 * invalidate any backing storage. Return true if the page may be safely
1462 * freed and false otherwise.
1462 *
1463 * The object must be locked. The page must be locked if it is managed.
1464 */
1463 *
1464 * The object must be locked. The page must be locked if it is managed.
1465 */
1465void
1466bool
1466vm_page_remove(vm_page_t m)
1467{
1468 vm_object_t object;
1469 vm_page_t mrem;
1470
1467vm_page_remove(vm_page_t m)
1468{
1469 vm_object_t object;
1470 vm_page_t mrem;
1471
1472 object = m->object;
1473
1471 if ((m->oflags & VPO_UNMANAGED) == 0)
1472 vm_page_assert_locked(m);
1474 if ((m->oflags & VPO_UNMANAGED) == 0)
1475 vm_page_assert_locked(m);
1473 if ((object = m->object) == NULL)
1474 return;
1475 VM_OBJECT_ASSERT_WLOCKED(object);
1476 if (vm_page_xbusied(m))
1477 vm_page_xunbusy_maybelocked(m);
1478 mrem = vm_radix_remove(&object->rtree, m->pindex);
1479 KASSERT(mrem == m, ("removed page %p, expected page %p", mrem, m));
1480
1481 /*
1482 * Now remove from the object's list of backed pages.

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1490
1491 /*
1492 * The vnode may now be recycled.
1493 */
1494 if (object->resident_page_count == 0 && object->type == OBJT_VNODE)
1495 vdrop(object->handle);
1496
1497 m->object = NULL;
1476 VM_OBJECT_ASSERT_WLOCKED(object);
1477 if (vm_page_xbusied(m))
1478 vm_page_xunbusy_maybelocked(m);
1479 mrem = vm_radix_remove(&object->rtree, m->pindex);
1480 KASSERT(mrem == m, ("removed page %p, expected page %p", mrem, m));
1481
1482 /*
1483 * Now remove from the object's list of backed pages.

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1491
1492 /*
1493 * The vnode may now be recycled.
1494 */
1495 if (object->resident_page_count == 0 && object->type == OBJT_VNODE)
1496 vdrop(object->handle);
1497
1498 m->object = NULL;
1499 return (!vm_page_wired(m));
1498}
1499
1500/*
1501 * vm_page_lookup:
1502 *
1503 * Returns the page associated with the object/offset
1504 * pair specified; if none is found, NULL is returned.
1505 *

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1660 }
1661
1662 /*
1663 * The operation cannot fail anymore. The removal must happen before
1664 * the listq iterator is tainted.
1665 */
1666 m->pindex = opidx;
1667 vm_page_lock(m);
1500}
1501
1502/*
1503 * vm_page_lookup:
1504 *
1505 * Returns the page associated with the object/offset
1506 * pair specified; if none is found, NULL is returned.
1507 *

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1662 }
1663
1664 /*
1665 * The operation cannot fail anymore. The removal must happen before
1666 * the listq iterator is tainted.
1667 */
1668 m->pindex = opidx;
1669 vm_page_lock(m);
1668 vm_page_remove(m);
1670 (void)vm_page_remove(m);
1669
1670 /* Return back to the new pindex to complete vm_page_insert(). */
1671 m->pindex = new_pindex;
1672 m->object = new_object;
1673 vm_page_unlock(m);
1674 vm_page_insert_radixdone(m, new_object, mpred);
1675 vm_page_dirty(m);
1676 return (0);

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3431 } else
3432 KASSERT(m->queue == PQ_NONE,
3433 ("vm_page_free_prep: unmanaged page %p is queued", m));
3434 VM_CNT_INC(v_tfree);
3435
3436 if (vm_page_sbusied(m))
3437 panic("vm_page_free_prep: freeing busy page %p", m);
3438
1671
1672 /* Return back to the new pindex to complete vm_page_insert(). */
1673 m->pindex = new_pindex;
1674 m->object = new_object;
1675 vm_page_unlock(m);
1676 vm_page_insert_radixdone(m, new_object, mpred);
1677 vm_page_dirty(m);
1678 return (0);

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3433 } else
3434 KASSERT(m->queue == PQ_NONE,
3435 ("vm_page_free_prep: unmanaged page %p is queued", m));
3436 VM_CNT_INC(v_tfree);
3437
3438 if (vm_page_sbusied(m))
3439 panic("vm_page_free_prep: freeing busy page %p", m);
3440
3439 vm_page_remove(m);
3441 if (m->object != NULL)
3442 (void)vm_page_remove(m);
3440
3441 /*
3442 * If fictitious remove object association and
3443 * return.
3444 */
3445 if ((m->flags & PG_FICTITIOUS) != 0) {
3446 KASSERT(m->wire_count == 1,
3447 ("fictitious page %p is not wired", m));

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3444 /*
3445 * If fictitious remove object association and
3446 * return.
3447 */
3448 if ((m->flags & PG_FICTITIOUS) != 0) {
3449 KASSERT(m->wire_count == 1,
3450 ("fictitious page %p is not wired", m));

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