diff options
Diffstat (limited to 'include/linux/page-flags.h')
| -rw-r--r-- | include/linux/page-flags.h | 195 |
1 files changed, 68 insertions, 127 deletions
diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h index e5bddbfcf7a..ed7659adfaa 100644 --- a/include/linux/page-flags.h +++ b/include/linux/page-flags.h @@ -149,28 +149,58 @@ static inline int TestClearPage##uname(struct page *page) \ #define TESTSCFLAG(uname, lname) \ TESTSETFLAG(uname, lname) TESTCLEARFLAG(uname, lname) +struct page; /* forward declaration */ + +PAGEFLAG(Locked, locked) TESTSCFLAG(Locked, locked) +PAGEFLAG(Error, error) +PAGEFLAG(Referenced, referenced) TESTCLEARFLAG(Referenced, referenced) +PAGEFLAG(Dirty, dirty) TESTSCFLAG(Dirty, dirty) __CLEARPAGEFLAG(Dirty, dirty) +PAGEFLAG(LRU, lru) __CLEARPAGEFLAG(LRU, lru) +PAGEFLAG(Active, active) __CLEARPAGEFLAG(Active, active) +__PAGEFLAG(Slab, slab) +PAGEFLAG(Checked, checked) /* Used by some filesystems */ +PAGEFLAG(Pinned, pinned) /* Xen pinned pagetable */ +PAGEFLAG(Reserved, reserved) __CLEARPAGEFLAG(Reserved, reserved) +PAGEFLAG(Private, private) __CLEARPAGEFLAG(Private, private) + __SETPAGEFLAG(Private, private) + +/* + * Only test-and-set exist for PG_writeback. The unconditional operators are + * risky: they bypass page accounting. + */ +TESTPAGEFLAG(Writeback, writeback) TESTSCFLAG(Writeback, writeback) +__PAGEFLAG(Buddy, buddy) +PAGEFLAG(MappedToDisk, mappedtodisk) + +/* PG_readahead is only used for file reads; PG_reclaim is only for writes */ +PAGEFLAG(Reclaim, reclaim) TESTCLEARFLAG(Reclaim, reclaim) +PAGEFLAG(Readahead, readahead) /* Reminder to do async read-ahead */ + +#ifdef CONFIG_HIGHMEM /* - * Manipulation of page state flags + * Must use a macro here due to header dependency issues. page_zone() is not + * available at this point. */ -#define PageLocked(page) \ - test_bit(PG_locked, &(page)->flags) -#define SetPageLocked(page) \ - set_bit(PG_locked, &(page)->flags) -#define TestSetPageLocked(page) \ - test_and_set_bit(PG_locked, &(page)->flags) -#define ClearPageLocked(page) \ - clear_bit(PG_locked, &(page)->flags) -#define TestClearPageLocked(page) \ - test_and_clear_bit(PG_locked, &(page)->flags) - -#define PageError(page) test_bit(PG_error, &(page)->flags) -#define SetPageError(page) set_bit(PG_error, &(page)->flags) -#define ClearPageError(page) clear_bit(PG_error, &(page)->flags) - -#define PageReferenced(page) test_bit(PG_referenced, &(page)->flags) -#define SetPageReferenced(page) set_bit(PG_referenced, &(page)->flags) -#define ClearPageReferenced(page) clear_bit(PG_referenced, &(page)->flags) -#define TestClearPageReferenced(page) test_and_clear_bit(PG_referenced, &(page)->flags) +#define PageHighMem(__p) is_highmem(page_zone(page)) +#else +static inline int PageHighMem(struct page *page) +{ + return 0; +} +#endif + +#ifdef CONFIG_SWAP +PAGEFLAG(SwapCache, swapcache) +#else +static inline int PageSwapCache(struct page *page) +{ + return 0; +} +#endif + +#if (BITS_PER_LONG > 32) +PAGEFLAG(Uncached, uncached) +#endif static inline int PageUptodate(struct page *page) { @@ -218,97 +248,37 @@ static inline void SetPageUptodate(struct page *page) #endif } -#define ClearPageUptodate(page) clear_bit(PG_uptodate, &(page)->flags) - -#define PageDirty(page) test_bit(PG_dirty, &(page)->flags) -#define SetPageDirty(page) set_bit(PG_dirty, &(page)->flags) -#define TestSetPageDirty(page) test_and_set_bit(PG_dirty, &(page)->flags) -#define ClearPageDirty(page) clear_bit(PG_dirty, &(page)->flags) -#define __ClearPageDirty(page) __clear_bit(PG_dirty, &(page)->flags) -#define TestClearPageDirty(page) test_and_clear_bit(PG_dirty, &(page)->flags) - -#define PageLRU(page) test_bit(PG_lru, &(page)->flags) -#define SetPageLRU(page) set_bit(PG_lru, &(page)->flags) -#define ClearPageLRU(page) clear_bit(PG_lru, &(page)->flags) -#define __ClearPageLRU(page) __clear_bit(PG_lru, &(page)->flags) - -#define PageActive(page) test_bit(PG_active, &(page)->flags) -#define SetPageActive(page) set_bit(PG_active, &(page)->flags) -#define ClearPageActive(page) clear_bit(PG_active, &(page)->flags) -#define __ClearPageActive(page) __clear_bit(PG_active, &(page)->flags) - -#define PageSlab(page) test_bit(PG_slab, &(page)->flags) -#define __SetPageSlab(page) __set_bit(PG_slab, &(page)->flags) -#define __ClearPageSlab(page) __clear_bit(PG_slab, &(page)->flags) - -#ifdef CONFIG_HIGHMEM -#define PageHighMem(page) is_highmem(page_zone(page)) -#else -#define PageHighMem(page) 0 /* needed to optimize away at compile time */ -#endif - -#define PageChecked(page) test_bit(PG_checked, &(page)->flags) -#define SetPageChecked(page) set_bit(PG_checked, &(page)->flags) -#define ClearPageChecked(page) clear_bit(PG_checked, &(page)->flags) - -#define PagePinned(page) test_bit(PG_pinned, &(page)->flags) -#define SetPagePinned(page) set_bit(PG_pinned, &(page)->flags) -#define ClearPagePinned(page) clear_bit(PG_pinned, &(page)->flags) - -#define PageReserved(page) test_bit(PG_reserved, &(page)->flags) -#define SetPageReserved(page) set_bit(PG_reserved, &(page)->flags) -#define ClearPageReserved(page) clear_bit(PG_reserved, &(page)->flags) -#define __ClearPageReserved(page) __clear_bit(PG_reserved, &(page)->flags) - -#define SetPagePrivate(page) set_bit(PG_private, &(page)->flags) -#define ClearPagePrivate(page) clear_bit(PG_private, &(page)->flags) -#define PagePrivate(page) test_bit(PG_private, &(page)->flags) -#define __SetPagePrivate(page) __set_bit(PG_private, &(page)->flags) -#define __ClearPagePrivate(page) __clear_bit(PG_private, &(page)->flags) +CLEARPAGEFLAG(Uptodate, uptodate) -/* - * Only test-and-set exist for PG_writeback. The unconditional operators are - * risky: they bypass page accounting. - */ -#define PageWriteback(page) test_bit(PG_writeback, &(page)->flags) -#define TestSetPageWriteback(page) test_and_set_bit(PG_writeback, \ - &(page)->flags) -#define TestClearPageWriteback(page) test_and_clear_bit(PG_writeback, \ - &(page)->flags) - -#define PageBuddy(page) test_bit(PG_buddy, &(page)->flags) -#define __SetPageBuddy(page) __set_bit(PG_buddy, &(page)->flags) -#define __ClearPageBuddy(page) __clear_bit(PG_buddy, &(page)->flags) - -#define PageMappedToDisk(page) test_bit(PG_mappedtodisk, &(page)->flags) -#define SetPageMappedToDisk(page) set_bit(PG_mappedtodisk, &(page)->flags) -#define ClearPageMappedToDisk(page) clear_bit(PG_mappedtodisk, &(page)->flags) +extern void cancel_dirty_page(struct page *page, unsigned int account_size); -#define PageReadahead(page) test_bit(PG_readahead, &(page)->flags) -#define SetPageReadahead(page) set_bit(PG_readahead, &(page)->flags) -#define ClearPageReadahead(page) clear_bit(PG_readahead, &(page)->flags) +int test_clear_page_writeback(struct page *page); +int test_set_page_writeback(struct page *page); -#define PageReclaim(page) test_bit(PG_reclaim, &(page)->flags) -#define SetPageReclaim(page) set_bit(PG_reclaim, &(page)->flags) -#define ClearPageReclaim(page) clear_bit(PG_reclaim, &(page)->flags) -#define TestClearPageReclaim(page) test_and_clear_bit(PG_reclaim, &(page)->flags) +static inline void set_page_writeback(struct page *page) +{ + test_set_page_writeback(page); +} -#define PageCompound(page) test_bit(PG_compound, &(page)->flags) -#define __SetPageCompound(page) __set_bit(PG_compound, &(page)->flags) -#define __ClearPageCompound(page) __clear_bit(PG_compound, &(page)->flags) +TESTPAGEFLAG(Compound, compound) +__PAGEFLAG(Head, compound) /* * PG_reclaim is used in combination with PG_compound to mark the - * head and tail of a compound page + * head and tail of a compound page. This saves one page flag + * but makes it impossible to use compound pages for the page cache. + * The PG_reclaim bit would have to be used for reclaim or readahead + * if compound pages enter the page cache. * * PG_compound & PG_reclaim => Tail page * PG_compound & ~PG_reclaim => Head page */ - #define PG_head_tail_mask ((1L << PG_compound) | (1L << PG_reclaim)) -#define PageTail(page) (((page)->flags & PG_head_tail_mask) \ - == PG_head_tail_mask) +static inline int PageTail(struct page *page) +{ + return ((page->flags & PG_head_tail_mask) == PG_head_tail_mask); +} static inline void __SetPageTail(struct page *page) { @@ -320,34 +290,5 @@ static inline void __ClearPageTail(struct page *page) page->flags &= ~PG_head_tail_mask; } -#define PageHead(page) (((page)->flags & PG_head_tail_mask) \ - == (1L << PG_compound)) -#define __SetPageHead(page) __SetPageCompound(page) -#define __ClearPageHead(page) __ClearPageCompound(page) - -#ifdef CONFIG_SWAP -#define PageSwapCache(page) test_bit(PG_swapcache, &(page)->flags) -#define SetPageSwapCache(page) set_bit(PG_swapcache, &(page)->flags) -#define ClearPageSwapCache(page) clear_bit(PG_swapcache, &(page)->flags) -#else -#define PageSwapCache(page) 0 -#endif - -#define PageUncached(page) test_bit(PG_uncached, &(page)->flags) -#define SetPageUncached(page) set_bit(PG_uncached, &(page)->flags) -#define ClearPageUncached(page) clear_bit(PG_uncached, &(page)->flags) - -struct page; /* forward declaration */ - -extern void cancel_dirty_page(struct page *page, unsigned int account_size); - -int test_clear_page_writeback(struct page *page); -int test_set_page_writeback(struct page *page); - -static inline void set_page_writeback(struct page *page) -{ - test_set_page_writeback(page); -} - #endif /* !__GENERATING_BOUNDS_H */ #endif /* PAGE_FLAGS_H */ |