page-flags: define PG_uptodate behavior on compound pages

[cascardo/linux.git] / include / linux / page-flags.h

diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index dff9085..818fa39 100644 (file)
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -404,8 +404,9 @@ u64 stable_page_flags(struct page *page);
 
 static inline int PageUptodate(struct page *page)
 {
-       int ret = test_bit(PG_uptodate, &(page)->flags);
-
+       int ret;
+       page = compound_head(page);
+       ret = test_bit(PG_uptodate, &(page)->flags);
        /*
         * Must ensure that the data we read out of the page is loaded
         * _after_ we've loaded page->flags to check for PageUptodate.
@@ -422,12 +423,14 @@ static inline int PageUptodate(struct page *page)
 
 static inline void __SetPageUptodate(struct page *page)
 {
+       VM_BUG_ON_PAGE(PageTail(page), page);
        smp_wmb();
        __set_bit(PG_uptodate, &page->flags);
 }
 
 static inline void SetPageUptodate(struct page *page)
 {
+       VM_BUG_ON_PAGE(PageTail(page), page);
        /*
         * Memory barrier must be issued before setting the PG_uptodate bit,
         * so that all previous stores issued in order to bring the page
@@ -437,7 +440,7 @@ static inline void SetPageUptodate(struct page *page)
        set_bit(PG_uptodate, &page->flags);
 }
 
-CLEARPAGEFLAG(Uptodate, uptodate, PF_ANY)
+CLEARPAGEFLAG(Uptodate, uptodate, PF_NO_TAIL)
 
 int test_clear_page_writeback(struct page *page);
 int __test_set_page_writeback(struct page *page, bool keep_write);