diff options
Diffstat (limited to 'mm/page-writeback.c')
| -rw-r--r-- | mm/page-writeback.c | 26 |
1 files changed, 19 insertions, 7 deletions
diff --git a/mm/page-writeback.c b/mm/page-writeback.c index 886ea0d5a13..44720363374 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -274,9 +274,9 @@ static void balance_dirty_pages(struct address_space *mapping) pdflush_operation(background_writeout, 0); } -void set_page_dirty_balance(struct page *page) +void set_page_dirty_balance(struct page *page, int page_mkwrite) { - if (set_page_dirty(page)) { + if (set_page_dirty(page) || page_mkwrite) { struct address_space *mapping = page_mapping(page); if (mapping) @@ -918,6 +918,9 @@ int clear_page_dirty_for_io(struct page *page) { struct address_space *mapping = page_mapping(page); + BUG_ON(!PageLocked(page)); + + ClearPageReclaim(page); if (mapping && mapping_cap_account_dirty(mapping)) { /* * Yes, Virginia, this is indeed insane. @@ -943,14 +946,19 @@ int clear_page_dirty_for_io(struct page *page) * We basically use the page "master dirty bit" * as a serialization point for all the different * threads doing their things. - * - * FIXME! We still have a race here: if somebody - * adds the page back to the page tables in - * between the "page_mkclean()" and the "TestClearPageDirty()", - * we might have it mapped without the dirty bit set. */ if (page_mkclean(page)) set_page_dirty(page); + /* + * We carefully synchronise fault handlers against + * installing a dirty pte and marking the page dirty + * at this point. We do this by having them hold the + * page lock at some point after installing their + * pte, but before marking the page dirty. + * Pages are always locked coming in here, so we get + * the desired exclusion. See mm/memory.c:do_wp_page() + * for more comments. + */ if (TestClearPageDirty(page)) { dec_zone_page_state(page, NR_FILE_DIRTY); return 1; @@ -979,6 +987,8 @@ int test_clear_page_writeback(struct page *page) } else { ret = TestClearPageWriteback(page); } + if (ret) + dec_zone_page_state(page, NR_WRITEBACK); return ret; } @@ -1004,6 +1014,8 @@ int test_set_page_writeback(struct page *page) } else { ret = TestSetPageWriteback(page); } + if (!ret) + inc_zone_page_state(page, NR_WRITEBACK); return ret; } |