return rc;
}
-static int __unmap_and_move(struct page *page, struct page *newpage,
+static int __unmap_and_move(struct folio *src, struct folio *dst,
int force, enum migrate_mode mode)
{
- struct folio *folio = page_folio(page);
- struct folio *dst = page_folio(newpage);
int rc = -EAGAIN;
bool page_was_mapped = false;
struct anon_vma *anon_vma = NULL;
- bool is_lru = !__PageMovable(page);
+ bool is_lru = !__PageMovable(&src->page);
- if (!trylock_page(page)) {
+ if (!folio_trylock(src)) {
if (!force || mode == MIGRATE_ASYNC)
goto out;
if (current->flags & PF_MEMALLOC)
goto out;
- lock_page(page);
+ folio_lock(src);
}
- if (PageWriteback(page)) {
+ if (folio_test_writeback(src)) {
/*
* Only in the case of a full synchronous migration is it
* necessary to wait for PageWriteback. In the async case,
}
if (!force)
goto out_unlock;
- wait_on_page_writeback(page);
+ folio_wait_writeback(src);
}
/*
- * By try_to_migrate(), page->mapcount goes down to 0 here. In this case,
- * we cannot notice that anon_vma is freed while we migrates a page.
+ * By try_to_migrate(), src->mapcount goes down to 0 here. In this case,
+ * we cannot notice that anon_vma is freed while we migrate a page.
* This get_anon_vma() delays freeing anon_vma pointer until the end
* of migration. File cache pages are no problem because of page_lock()
* File Caches may use write_page() or lock_page() in migration, then,
* just care Anon page here.
*
- * Only page_get_anon_vma() understands the subtleties of
+ * Only folio_get_anon_vma() understands the subtleties of
* getting a hold on an anon_vma from outside one of its mms.
* But if we cannot get anon_vma, then we won't need it anyway,
* because that implies that the anon page is no longer mapped
* (and cannot be remapped so long as we hold the page lock).
*/
- if (PageAnon(page) && !PageKsm(page))
- anon_vma = page_get_anon_vma(page);
+ if (folio_test_anon(src) && !folio_test_ksm(src))
+ anon_vma = folio_get_anon_vma(src);
/*
* Block others from accessing the new page when we get around to
* establishing additional references. We are usually the only one
- * holding a reference to newpage at this point. We used to have a BUG
- * here if trylock_page(newpage) fails, but would like to allow for
- * cases where there might be a race with the previous use of newpage.
+ * holding a reference to dst at this point. We used to have a BUG
+ * here if folio_trylock(dst) fails, but would like to allow for
+ * cases where there might be a race with the previous use of dst.
* This is much like races on refcount of oldpage: just don't BUG().
*/
- if (unlikely(!trylock_page(newpage)))
+ if (unlikely(!folio_trylock(dst)))
goto out_unlock;
if (unlikely(!is_lru)) {
- rc = move_to_new_folio(dst, folio, mode);
+ rc = move_to_new_folio(dst, src, mode);
goto out_unlock_both;
}
* Corner case handling:
* 1. When a new swap-cache page is read into, it is added to the LRU
* and treated as swapcache but it has no rmap yet.
- * Calling try_to_unmap() against a page->mapping==NULL page will
+ * Calling try_to_unmap() against a src->mapping==NULL page will
* trigger a BUG. So handle it here.
* 2. An orphaned page (see truncate_cleanup_page) might have
* fs-private metadata. The page can be picked up due to memory
* invisible to the vm, so the page can not be migrated. So try to
* free the metadata, so the page can be freed.
*/
- if (!page->mapping) {
- VM_BUG_ON_PAGE(PageAnon(page), page);
- if (page_has_private(page)) {
- try_to_free_buffers(folio);
+ if (!src->mapping) {
+ if (folio_test_private(src)) {
+ try_to_free_buffers(src);
goto out_unlock_both;
}
- } else if (page_mapped(page)) {
+ } else if (folio_mapped(src)) {
/* Establish migration ptes */
- VM_BUG_ON_PAGE(PageAnon(page) && !PageKsm(page) && !anon_vma,
- page);
- try_to_migrate(folio, 0);
+ VM_BUG_ON_FOLIO(folio_test_anon(src) &&
+ !folio_test_ksm(src) && !anon_vma, src);
+ try_to_migrate(src, 0);
page_was_mapped = true;
}
- if (!page_mapped(page))
- rc = move_to_new_folio(dst, folio, mode);
+ if (!folio_mapped(src))
+ rc = move_to_new_folio(dst, src, mode);
/*
- * When successful, push newpage to LRU immediately: so that if it
+ * When successful, push dst to LRU immediately: so that if it
* turns out to be an mlocked page, remove_migration_ptes() will
- * automatically build up the correct newpage->mlock_count for it.
+ * automatically build up the correct dst->mlock_count for it.
*
* We would like to do something similar for the old page, when
* unsuccessful, and other cases when a page has been temporarily
* isolated from the unevictable LRU: but this case is the easiest.
*/
if (rc == MIGRATEPAGE_SUCCESS) {
- lru_cache_add(newpage);
+ folio_add_lru(dst);
if (page_was_mapped)
lru_add_drain();
}
if (page_was_mapped)
- remove_migration_ptes(folio,
- rc == MIGRATEPAGE_SUCCESS ? dst : folio, false);
+ remove_migration_ptes(src,
+ rc == MIGRATEPAGE_SUCCESS ? dst : src, false);
out_unlock_both:
- unlock_page(newpage);
+ folio_unlock(dst);
out_unlock:
/* Drop an anon_vma reference if we took one */
if (anon_vma)
put_anon_vma(anon_vma);
- unlock_page(page);
+ folio_unlock(src);
out:
/*
- * If migration is successful, decrease refcount of the newpage,
+ * If migration is successful, decrease refcount of dst,
* which will not free the page because new page owner increased
* refcounter.
*/
if (rc == MIGRATEPAGE_SUCCESS)
- put_page(newpage);
+ folio_put(dst);
return rc;
}
enum migrate_reason reason,
struct list_head *ret)
{
+ struct folio *dst, *src = page_folio(page);
int rc = MIGRATEPAGE_SUCCESS;
struct page *newpage = NULL;
newpage = get_new_page(page, private);
if (!newpage)
return -ENOMEM;
+ dst = page_folio(newpage);
newpage->private = 0;
- rc = __unmap_and_move(page, newpage, force, mode);
+ rc = __unmap_and_move(src, dst, force, mode);
if (rc == MIGRATEPAGE_SUCCESS)
set_page_owner_migrate_reason(newpage, reason);
if (!hugepage_migration_supported(page_hstate(hpage)))
return -ENOSYS;
- if (page_count(hpage) == 1) {
+ if (folio_ref_count(src) == 1) {
/* page was freed from under us. So we are done. */
putback_active_hugepage(hpage);
return MIGRATEPAGE_SUCCESS;
return -ENOMEM;
dst = page_folio(new_hpage);
- if (!trylock_page(hpage)) {
+ if (!folio_trylock(src)) {
if (!force)
goto out;
switch (mode) {
default:
goto out;
}
- lock_page(hpage);
+ folio_lock(src);
}
/*
* Check for pages which are in the process of being freed. Without
- * page_mapping() set, hugetlbfs specific move page routine will not
+ * folio_mapping() set, hugetlbfs specific move page routine will not
* be called and we could leak usage counts for subpools.
*/
- if (hugetlb_page_subpool(hpage) && !page_mapping(hpage)) {
+ if (hugetlb_page_subpool(hpage) && !folio_mapping(src)) {
rc = -EBUSY;
goto out_unlock;
}
- if (PageAnon(hpage))
- anon_vma = page_get_anon_vma(hpage);
+ if (folio_test_anon(src))
+ anon_vma = folio_get_anon_vma(src);
- if (unlikely(!trylock_page(new_hpage)))
+ if (unlikely(!folio_trylock(dst)))
goto put_anon;
- if (page_mapped(hpage)) {
+ if (folio_mapped(src)) {
enum ttu_flags ttu = 0;
- if (!PageAnon(hpage)) {
+ if (!folio_test_anon(src)) {
/*
* In shared mappings, try_to_unmap could potentially
* call huge_pmd_unshare. Because of this, take
i_mmap_unlock_write(mapping);
}
- if (!page_mapped(hpage))
+ if (!folio_mapped(src))
rc = move_to_new_folio(dst, src, mode);
if (page_was_mapped)
rc == MIGRATEPAGE_SUCCESS ? dst : src, false);
unlock_put_anon:
- unlock_page(new_hpage);
+ folio_unlock(dst);
put_anon:
if (anon_vma)
}
out_unlock:
- unlock_page(hpage);
+ folio_unlock(src);
out:
if (rc == MIGRATEPAGE_SUCCESS)
putback_active_hugepage(hpage);
else if (rc != -EAGAIN)
- list_move_tail(&hpage->lru, ret);
+ list_move_tail(&src->lru, ret);
/*
* If migration was not successful and there's a freeing callback, use
projects / linux-2.6-microblaze.git / blobdiff