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

/*
 * Macros for manipulating and testing page->flags
 */

#ifndef PAGE_FLAGS_H
#define PAGE_FLAGS_H

#include <linux/percpu.h>
#include <linux/cache.h>
#include <asm/pgtable.h>

/*
 * Various page->flags bits:
 *
 * PG_reserved is set for special pages, which can never be swapped out. Some
 * of them might not even exist (eg empty_bad_page)...
 *
 * The PG_private bitflag is set if page->private contains a valid value.
 *
 * During disk I/O, PG_locked is used. This bit is set before I/O and
 * reset when I/O completes. page_waitqueue(page) is a wait queue of all tasks
 * waiting for the I/O on this page to complete.
 *
 * PG_uptodate tells whether the page's contents is valid.  When a read
 * completes, the page becomes uptodate, unless a disk I/O error happened.
 *
 * For choosing which pages to swap out, inode pages carry a PG_referenced bit,
 * which is set any time the system accesses that page through the (mapping,
 * index) hash table.  This referenced bit, together with the referenced bit
 * in the page tables, is used to manipulate page->age and move the page across
 * the active, inactive_dirty and inactive_clean lists.
 *
 * Note that the referenced bit, the page->lru list_head and the active,
 * inactive_dirty and inactive_clean lists are protected by the
 * zone->lru_lock, and *NOT* by the usual PG_locked bit!
 *
 * PG_error is set to indicate that an I/O error occurred on this page.
 *
 * PG_arch_1 is an architecture specific page state bit.  The generic code
 * guarantees that this bit is cleared for a page when it first is entered into
 * the page cache.
 *
 * PG_highmem pages are not permanently mapped into the kernel virtual address
 * space, they need to be kmapped separately for doing IO on the pages.  The
 * struct page (these bits with information) are always mapped into kernel
 * address space...
 */

/*
 * Don't use the *_dontuse flags.  Use the macros.  Otherwise you'll break
 * locked- and dirty-page accounting.  The top eight bits of page->flags are
 * used for page->zone, so putting flag bits there doesn't work.
 */
#define PG_locked	 	 0	/* Page is locked. Don't touch. */
#define PG_error		 1
#define PG_referenced		 2
#define PG_uptodate		 3

#define PG_dirty	 	 4
#define PG_lru			 5
#define PG_active		 6
#define PG_slab			 7	/* slab debug (Suparna wants this) */

#define PG_checked		 8	/* kill me in 2.5.<early>. */
#define PG_arch_1		 9
#define PG_reserved		10
#define PG_private		11	/* Has something at ->private */

#define PG_writeback		12	/* Page is under writeback */
#define PG_nosave		13	/* Used for system suspend/resume */
#define PG_compound		14	/* Part of a compound page */
#define PG_swapcache		15	/* Swap page: swp_entry_t in private */

#define PG_mappedtodisk		16	/* Has blocks allocated on-disk */
#define PG_reclaim		17	/* To be reclaimed asap */
#define PG_nosave_free		18	/* Free, should not be written */
#define PG_uncached		19	/* Page has been mapped as uncached */

/*
 * Global page accounting.  One instance per CPU.  Only unsigned longs are
 * allowed.
 */
struct page_state {
	unsigned long nr_dirty;		/* Dirty writeable pages */
	unsigned long nr_writeback;	/* Pages under writeback */
	unsigned long nr_unstable;	/* NFS unstable pages */
	unsigned long nr_page_table_pages;/* Pages used for pagetables */
	unsigned long nr_mapped;	/* mapped into pagetables */
	unsigned long nr_slab;		/* In slab */
#define GET_PAGE_STATE_LAST nr_slab

	/*
	 * The below are zeroed by get_page_state().  Use get_full_page_state()
	 * to add up all these.
	 */
	unsigned long pgpgin;		/* Disk reads */
	unsigned long pgpgout;		/* Disk writes */
	unsigned long pswpin;		/* swap reads */
	unsigned long pswpout;		/* swap writes */
	unsigned long pgalloc_high;	/* page allocations */

	unsigned long pgalloc_normal;
	unsigned long pgalloc_dma;
	unsigned long pgfree;		/* page freeings */
	unsigned long pgactivate;	/* pages moved inactive->active */
	unsigned long pgdeactivate;	/* pages moved active->inactive */

	unsigned long pgfault;		/* faults (major+minor) */
	unsigned long pgmajfault;	/* faults (major only) */
	unsigned long pgrefill_high;	/* inspected in refill_inactive_zone */
	unsigned long pgrefill_normal;
	unsigned long pgrefill_dma;

	unsigned long pgsteal_high;	/* total highmem pages reclaimed */
	unsigned long pgsteal_normal;
	unsigned long pgsteal_dma;
	unsigned long pgscan_kswapd_high;/* total highmem pages scanned */
	unsigned long pgscan_kswapd_normal;

	unsigned long pgscan_kswapd_dma;
	unsigned long pgscan_direct_high;/* total highmem pages scanned */
	unsigned long pgscan_direct_normal;
	unsigned long pgscan_direct_dma;
	unsigned long pginodesteal;	/* pages reclaimed via inode freeing */

	unsigned long slabs_scanned;	/* slab objects scanned */
	unsigned long kswapd_steal;	/* pages reclaimed by kswapd */
	unsigned long kswapd_inodesteal;/* reclaimed via kswapd inode freeing */
	unsigned long pageoutrun;	/* kswapd's calls to page reclaim */
	unsigned long allocstall;	/* direct reclaim calls */

	unsigned long pgrotated;	/* pages rotated to tail of the LRU */
	unsigned long nr_bounce;	/* pages for bounce buffers */
};

extern void get_page_state(struct page_state *ret);
extern void get_full_page_state(struct page_state *ret);
extern unsigned long __read_page_state(unsigned long offset);
extern void __mod_page_state(unsigned long offset, unsigned long delta);

#define read_page_state(member) \
	__read_page_state(offsetof(struct page_state, member))

#define mod_page_state(member, delta)	\
	__mod_page_state(offsetof(struct page_state, member), (delta))

#define inc_page_state(member)	mod_page_state(member, 1UL)
#define dec_page_state(member)	mod_page_state(member, 0UL - 1)
#define add_page_state(member,delta) mod_page_state(member, (delta))
#define sub_page_state(member,delta) mod_page_state(member, 0UL - (delta))

#define mod_page_state_zone(zone, member, delta)				\
	do {									\
		unsigned offset;						\
		if (is_highmem(zone))						\
			offset = offsetof(struct page_state, member##_high);	\
		else if (is_normal(zone))					\
			offset = offsetof(struct page_state, member##_normal);	\
		else								\
			offset = offsetof(struct page_state, member##_dma);	\
		__mod_page_state(offset, (delta));				\
	} while (0)

/*
 * Manipulation of page state flags
 */
#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 PageUptodate(page)	test_bit(PG_uptodate, &(page)->flags)
#ifndef SetPageUptodate
#define SetPageUptodate(page)	set_bit(PG_uptodate, &(page)->flags)
#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 TestClearPageDirty(page) test_and_clear_bit(PG_dirty, &(page)->flags)

#define SetPageLRU(page)	set_bit(PG_lru, &(page)->flags)
#define PageLRU(page)		test_bit(PG_lru, &(page)->flags)
#define TestSetPageLRU(page)	test_and_set_bit(PG_lru, &(page)->flags)
#define TestClearPageLRU(page)	test_and_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 TestClearPageActive(page) test_and_clear_bit(PG_active, &(page)->flags)
#define TestSetPageActive(page) test_and_set_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)
#define TestClearPageSlab(page)	test_and_clear_bit(PG_slab, &(page)->flags)
#define TestSetPageSlab(page)	test_and_set_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 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)

#define PageWriteback(page)	test_bit(PG_writeback, &(page)->flags)
#define SetPageWriteback(page)						\
	do {								\
		if (!test_and_set_bit(PG_writeback,			\
				&(page)->flags))			\
			inc_page_state(nr_writeback);			\
	} while (0)
#define TestSetPageWriteback(page)					\
	({								\
		int ret;						\
		ret = test_and_set_bit(PG_writeback,			\
					&(page)->flags);		\
		if (!ret)						\
			inc_page_state(nr_writeback);			\
		ret;							\
	})
#define ClearPageWriteback(page)					\
	do {								\
		if (test_and_clear_bit(PG_writeback,			\
				&(page)->flags))			\
			dec_page_state(nr_writeback);			\
	} while (0)
#define TestClearPageWriteback(page)					\
	({								\
		int ret;						\
		ret = test_and_clear_bit(PG_writeback,			\
				&(page)->flags);			\
		if (ret)						\
			dec_page_state(nr_writeback);			\
		ret;							\
	})

#define PageNosave(page)	test_bit(PG_nosave, &(page)->flags)
#define SetPageNosave(page)	set_bit(PG_nosave, &(page)->flags)
#define TestSetPageNosave(page)	test_and_set_bit(PG_nosave, &(page)->flags)
#define ClearPageNosave(page)		clear_bit(PG_nosave, &(page)->flags)
#define TestClearPageNosave(page)	test_and_clear_bit(PG_nosave, &(page)->flags)

#define PageNosaveFree(page)	test_bit(PG_nosave_free, &(page)->flags)
#define SetPageNosaveFree(page)	set_bit(PG_nosave_free, &(page)->flags)
#define ClearPageNosaveFree(page)		clear_bit(PG_nosave_free, &(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)

#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)

#ifdef CONFIG_HUGETLB_PAGE
#define PageCompound(page)	test_bit(PG_compound, &(page)->flags)
#else
#define PageCompound(page)	0
#endif
#define SetPageCompound(page)	set_bit(PG_compound, &(page)->flags)
#define ClearPageCompound(page)	clear_bit(PG_compound, &(page)->flags)

#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 */

int test_clear_page_dirty(struct page *page);
int test_clear_page_writeback(struct page *page);
int test_set_page_writeback(struct page *page);

static inline void clear_page_dirty(struct page *page)
{
	test_clear_page_dirty(page);
}

static inline void set_page_writeback(struct page *page)
{
	test_set_page_writeback(page);
}

#endif	/* PAGE_FLAGS_H */
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Macros for manipulating and testing page->flags
	3	*/
	4
	5	#ifndef PAGE_FLAGS_H
	6	#define PAGE_FLAGS_H
	7
	8	#include <linux/percpu.h>
	9	#include <linux/cache.h>
	10	#include <asm/pgtable.h>
	11
	12	/*
	13	* Various page->flags bits:
	14	*
	15	* PG_reserved is set for special pages, which can never be swapped out. Some
	16	* of them might not even exist (eg empty_bad_page)...
	17	*
	18	* The PG_private bitflag is set if page->private contains a valid value.
	19	*
	20	* During disk I/O, PG_locked is used. This bit is set before I/O and
	21	* reset when I/O completes. page_waitqueue(page) is a wait queue of all tasks
	22	* waiting for the I/O on this page to complete.
	23	*
	24	* PG_uptodate tells whether the page's contents is valid. When a read
	25	* completes, the page becomes uptodate, unless a disk I/O error happened.
	26	*
	27	* For choosing which pages to swap out, inode pages carry a PG_referenced bit,
	28	* which is set any time the system accesses that page through the (mapping,
	29	* index) hash table. This referenced bit, together with the referenced bit
	30	* in the page tables, is used to manipulate page->age and move the page across
	31	* the active, inactive_dirty and inactive_clean lists.
	32	*
	33	* Note that the referenced bit, the page->lru list_head and the active,
	34	* inactive_dirty and inactive_clean lists are protected by the
	35	* zone->lru_lock, and NOT by the usual PG_locked bit!
	36	*
	37	* PG_error is set to indicate that an I/O error occurred on this page.
	38	*
	39	* PG_arch_1 is an architecture specific page state bit. The generic code
	40	* guarantees that this bit is cleared for a page when it first is entered into
	41	* the page cache.
	42	*
	43	* PG_highmem pages are not permanently mapped into the kernel virtual address
	44	* space, they need to be kmapped separately for doing IO on the pages. The
	45	* struct page (these bits with information) are always mapped into kernel
	46	* address space...
	47	*/
	48
	49	/*
	50	* Don't use the *_dontuse flags. Use the macros. Otherwise you'll break
	51	* locked- and dirty-page accounting. The top eight bits of page->flags are
	52	* used for page->zone, so putting flag bits there doesn't work.
	53	*/
	54	#define PG_locked 0 /* Page is locked. Don't touch. */
	55	#define PG_error 1
	56	#define PG_referenced 2
	57	#define PG_uptodate 3
	58
	59	#define PG_dirty 4
	60	#define PG_lru 5
	61	#define PG_active 6
	62	#define PG_slab 7 /* slab debug (Suparna wants this) */
	63
cbe37d09 BP	64	#define PG_checked 8 /* kill me in 2.5.<early>. */
	65	#define PG_arch_1 9
	66	#define PG_reserved 10
	67	#define PG_private 11 /* Has something at ->private */
	68
	69	#define PG_writeback 12 /* Page is under writeback */
	70	#define PG_nosave 13 /* Used for system suspend/resume */
	71	#define PG_compound 14 /* Part of a compound page */
	72	#define PG_swapcache 15 /* Swap page: swp_entry_t in private */
	73
	74	#define PG_mappedtodisk 16 /* Has blocks allocated on-disk */
	75	#define PG_reclaim 17 /* To be reclaimed asap */
	76	#define PG_nosave_free 18 /* Free, should not be written */
	77	#define PG_uncached 19 /* Page has been mapped as uncached */
1da177e4 LT	78
	79	/*
	80	* Global page accounting. One instance per CPU. Only unsigned longs are
	81	* allowed.
	82	*/
	83	struct page_state {
	84	unsigned long nr_dirty; /* Dirty writeable pages */
	85	unsigned long nr_writeback; /* Pages under writeback */
	86	unsigned long nr_unstable; /* NFS unstable pages */
	87	unsigned long nr_page_table_pages;/* Pages used for pagetables */
	88	unsigned long nr_mapped; /* mapped into pagetables */
	89	unsigned long nr_slab; /* In slab */
	90	#define GET_PAGE_STATE_LAST nr_slab
	91
	92	/*
	93	* The below are zeroed by get_page_state(). Use get_full_page_state()
	94	* to add up all these.
	95	*/
	96	unsigned long pgpgin; /* Disk reads */
	97	unsigned long pgpgout; /* Disk writes */
	98	unsigned long pswpin; /* swap reads */
	99	unsigned long pswpout; /* swap writes */
	100	unsigned long pgalloc_high; /* page allocations */
	101
	102	unsigned long pgalloc_normal;
	103	unsigned long pgalloc_dma;
	104	unsigned long pgfree; /* page freeings */
	105	unsigned long pgactivate; /* pages moved inactive->active */
	106	unsigned long pgdeactivate; /* pages moved active->inactive */
	107
	108	unsigned long pgfault; /* faults (major+minor) */
	109	unsigned long pgmajfault; /* faults (major only) */
	110	unsigned long pgrefill_high; /* inspected in refill_inactive_zone */
	111	unsigned long pgrefill_normal;
	112	unsigned long pgrefill_dma;
	113
	114	unsigned long pgsteal_high; /* total highmem pages reclaimed */
	115	unsigned long pgsteal_normal;
	116	unsigned long pgsteal_dma;
	117	unsigned long pgscan_kswapd_high;/* total highmem pages scanned */
	118	unsigned long pgscan_kswapd_normal;
	119
	120	unsigned long pgscan_kswapd_dma;
	121	unsigned long pgscan_direct_high;/* total highmem pages scanned */
	122	unsigned long pgscan_direct_normal;
	123	unsigned long pgscan_direct_dma;
	124	unsigned long pginodesteal; /* pages reclaimed via inode freeing */
	125
	126	unsigned long slabs_scanned; /* slab objects scanned */
	127	unsigned long kswapd_steal; /* pages reclaimed by kswapd */
	128	unsigned long kswapd_inodesteal;/* reclaimed via kswapd inode freeing */
	129	unsigned long pageoutrun; /* kswapd's calls to page reclaim */
	130	unsigned long allocstall; /* direct reclaim calls */
	131
	132	unsigned long pgrotated; /* pages rotated to tail of the LRU */
edfbe2b0	133	unsigned long nr_bounce; /* pages for bounce buffers */
1da177e4 LT	134	};
	135
	136	extern void get_page_state(struct page_state *ret);
	137	extern void get_full_page_state(struct page_state *ret);
c2f29ea1	138	extern unsigned long __read_page_state(unsigned long offset);
83e5d8f7	139	extern void __mod_page_state(unsigned long offset, unsigned long delta);
1da177e4 LT	140
	141	#define read_page_state(member) \
	142	__read_page_state(offsetof(struct page_state, member))
	143
	144	#define mod_page_state(member, delta) \
	145	__mod_page_state(offsetof(struct page_state, member), (delta))
	146
	147	#define inc_page_state(member) mod_page_state(member, 1UL)
	148	#define dec_page_state(member) mod_page_state(member, 0UL - 1)
	149	#define add_page_state(member,delta) mod_page_state(member, (delta))
	150	#define sub_page_state(member,delta) mod_page_state(member, 0UL - (delta))
	151
	152	#define mod_page_state_zone(zone, member, delta) \
	153	do { \
	154	unsigned offset; \
	155	if (is_highmem(zone)) \
	156	offset = offsetof(struct page_state, member##_high); \
	157	else if (is_normal(zone)) \
	158	offset = offsetof(struct page_state, member##_normal); \
	159	else \
	160	offset = offsetof(struct page_state, member##_dma); \
	161	__mod_page_state(offset, (delta)); \
	162	} while (0)
	163
	164	/*
	165	* Manipulation of page state flags
	166	*/
	167	#define PageLocked(page) \
	168	test_bit(PG_locked, &(page)->flags)
	169	#define SetPageLocked(page) \
	170	set_bit(PG_locked, &(page)->flags)
	171	#define TestSetPageLocked(page) \
	172	test_and_set_bit(PG_locked, &(page)->flags)
	173	#define ClearPageLocked(page) \
	174	clear_bit(PG_locked, &(page)->flags)
	175	#define TestClearPageLocked(page) \
	176	test_and_clear_bit(PG_locked, &(page)->flags)
	177
	178	#define PageError(page) test_bit(PG_error, &(page)->flags)
	179	#define SetPageError(page) set_bit(PG_error, &(page)->flags)
	180	#define ClearPageError(page) clear_bit(PG_error, &(page)->flags)
	181
	182	#define PageReferenced(page) test_bit(PG_referenced, &(page)->flags)
	183	#define SetPageReferenced(page) set_bit(PG_referenced, &(page)->flags)
	184	#define ClearPageReferenced(page) clear_bit(PG_referenced, &(page)->flags)
	185	#define TestClearPageReferenced(page) test_and_clear_bit(PG_referenced, &(page)->flags)
	186
	187	#define PageUptodate(page) test_bit(PG_uptodate, &(page)->flags)
	188	#ifndef SetPageUptodate
	189	#define SetPageUptodate(page) set_bit(PG_uptodate, &(page)->flags)
	190	#endif
	191	#define ClearPageUptodate(page) clear_bit(PG_uptodate, &(page)->flags)
	192
	193	#define PageDirty(page) test_bit(PG_dirty, &(page)->flags)
	194	#define SetPageDirty(page) set_bit(PG_dirty, &(page)->flags)
	195	#define TestSetPageDirty(page) test_and_set_bit(PG_dirty, &(page)->flags)
	196	#define ClearPageDirty(page) clear_bit(PG_dirty, &(page)->flags)
	197	#define TestClearPageDirty(page) test_and_clear_bit(PG_dirty, &(page)->flags)
	198
	199	#define SetPageLRU(page) set_bit(PG_lru, &(page)->flags)
	200	#define PageLRU(page) test_bit(PG_lru, &(page)->flags)
	201	#define TestSetPageLRU(page) test_and_set_bit(PG_lru, &(page)->flags)
	202	#define TestClearPageLRU(page) test_and_clear_bit(PG_lru, &(page)->flags)
	203
204	#define PageActive(page) test_bit(PG_active, &(page)->flags)
205	#define SetPageActive(page) set_bit(PG_active, &(page)->flags)
206	#define ClearPageActive(page) clear_bit(PG_active, &(page)->flags)
207	#define TestClearPageActive(page) test_and_clear_bit(PG_active, &(page)->flags)
208	#define TestSetPageActive(page) test_and_set_bit(PG_active, &(page)->flags)
209
210	#define PageSlab(page) test_bit(PG_slab, &(page)->flags)
211	#define SetPageSlab(page) set_bit(PG_slab, &(page)->flags)
212	#define ClearPageSlab(page) clear_bit(PG_slab, &(page)->flags)
213	#define TestClearPageSlab(page) test_and_clear_bit(PG_slab, &(page)->flags)
214	#define TestSetPageSlab(page) test_and_set_bit(PG_slab, &(page)->flags)
215
216	#ifdef CONFIG_HIGHMEM
cbe37d09	217	#define PageHighMem(page) is_highmem(page_zone(page))
1da177e4 LT	218	#else
	219	#define PageHighMem(page) 0 /* needed to optimize away at compile time */
	220	#endif
	221
	222	#define PageChecked(page) test_bit(PG_checked, &(page)->flags)
	223	#define SetPageChecked(page) set_bit(PG_checked, &(page)->flags)
	224	#define ClearPageChecked(page) clear_bit(PG_checked, &(page)->flags)
	225
	226	#define PageReserved(page) test_bit(PG_reserved, &(page)->flags)
	227	#define SetPageReserved(page) set_bit(PG_reserved, &(page)->flags)
	228	#define ClearPageReserved(page) clear_bit(PG_reserved, &(page)->flags)
	229	#define __ClearPageReserved(page) __clear_bit(PG_reserved, &(page)->flags)
	230
	231	#define SetPagePrivate(page) set_bit(PG_private, &(page)->flags)
	232	#define ClearPagePrivate(page) clear_bit(PG_private, &(page)->flags)
	233	#define PagePrivate(page) test_bit(PG_private, &(page)->flags)
	234	#define __SetPagePrivate(page) __set_bit(PG_private, &(page)->flags)
	235	#define __ClearPagePrivate(page) __clear_bit(PG_private, &(page)->flags)
	236
	237	#define PageWriteback(page) test_bit(PG_writeback, &(page)->flags)
	238	#define SetPageWriteback(page) \
	239	do { \
	240	if (!test_and_set_bit(PG_writeback, \
	241	&(page)->flags)) \
	242	inc_page_state(nr_writeback); \
	243	} while (0)
	244	#define TestSetPageWriteback(page) \
	245	({ \
	246	int ret; \
	247	ret = test_and_set_bit(PG_writeback, \
	248	&(page)->flags); \
	249	if (!ret) \
	250	inc_page_state(nr_writeback); \
	251	ret; \
	252	})
	253	#define ClearPageWriteback(page) \
	254	do { \
	255	if (test_and_clear_bit(PG_writeback, \
	256	&(page)->flags)) \
	257	dec_page_state(nr_writeback); \
	258	} while (0)
	259	#define TestClearPageWriteback(page) \
	260	({ \
	261	int ret; \
	262	ret = test_and_clear_bit(PG_writeback, \
	263	&(page)->flags); \
	264	if (ret) \
	265	dec_page_state(nr_writeback); \
	266	ret; \
	267	})
	268
	269	#define PageNosave(page) test_bit(PG_nosave, &(page)->flags)
	270	#define SetPageNosave(page) set_bit(PG_nosave, &(page)->flags)
	271	#define TestSetPageNosave(page) test_and_set_bit(PG_nosave, &(page)->flags)
	272	#define ClearPageNosave(page) clear_bit(PG_nosave, &(page)->flags)
	273	#define TestClearPageNosave(page) test_and_clear_bit(PG_nosave, &(page)->flags)
	274
	275	#define PageNosaveFree(page) test_bit(PG_nosave_free, &(page)->flags)
	276	#define SetPageNosaveFree(page) set_bit(PG_nosave_free, &(page)->flags)
	277	#define ClearPageNosaveFree(page) clear_bit(PG_nosave_free, &(page)->flags)
	278
	279	#define PageMappedToDisk(page) test_bit(PG_mappedtodisk, &(page)->flags)
	280	#define SetPageMappedToDisk(page) set_bit(PG_mappedtodisk, &(page)->flags)
	281	#define ClearPageMappedToDisk(page) clear_bit(PG_mappedtodisk, &(page)->flags)
282
283	#define PageReclaim(page) test_bit(PG_reclaim, &(page)->flags)
284	#define SetPageReclaim(page) set_bit(PG_reclaim, &(page)->flags)
285	#define ClearPageReclaim(page) clear_bit(PG_reclaim, &(page)->flags)
286	#define TestClearPageReclaim(page) test_and_clear_bit(PG_reclaim, &(page)->flags)
287
288	#ifdef CONFIG_HUGETLB_PAGE
289	#define PageCompound(page) test_bit(PG_compound, &(page)->flags)
290	#else
291	#define PageCompound(page) 0
292	#endif
293	#define SetPageCompound(page) set_bit(PG_compound, &(page)->flags)
294	#define ClearPageCompound(page) clear_bit(PG_compound, &(page)->flags)
295
296	#ifdef CONFIG_SWAP
297	#define PageSwapCache(page) test_bit(PG_swapcache, &(page)->flags)
298	#define SetPageSwapCache(page) set_bit(PG_swapcache, &(page)->flags)
299	#define ClearPageSwapCache(page) clear_bit(PG_swapcache, &(page)->flags)
300	#else
301	#define PageSwapCache(page) 0
302	#endif
303
304	#define PageUncached(page) test_bit(PG_uncached, &(page)->flags)
305	#define SetPageUncached(page) set_bit(PG_uncached, &(page)->flags)
306	#define ClearPageUncached(page) clear_bit(PG_uncached, &(page)->flags)
307
308	struct page; /* forward declaration */
309
310	int test_clear_page_dirty(struct page *page);
311	int test_clear_page_writeback(struct page *page);
312	int test_set_page_writeback(struct page *page);
313
314	static inline void clear_page_dirty(struct page *page)
315	{
316	test_clear_page_dirty(page);
317	}
318
319	static inline void set_page_writeback(struct page *page)
320	{
321	test_set_page_writeback(page);
322	}
323
324	#endif /* PAGE_FLAGS_H */