mm.h 54.8 KB
Newer Older
L
Linus Torvalds 已提交
1 2 3 4 5 6 7 8
#ifndef _LINUX_MM_H
#define _LINUX_MM_H

#include <linux/errno.h>

#ifdef __KERNEL__

#include <linux/gfp.h>
9
#include <linux/bug.h>
L
Linus Torvalds 已提交
10 11 12 13
#include <linux/list.h>
#include <linux/mmzone.h>
#include <linux/rbtree.h>
#include <linux/prio_tree.h>
14
#include <linux/atomic.h>
15
#include <linux/debug_locks.h>
16
#include <linux/mm_types.h>
17
#include <linux/range.h>
18
#include <linux/pfn.h>
A
Andrea Arcangeli 已提交
19
#include <linux/bit_spinlock.h>
20
#include <linux/shrinker.h>
L
Linus Torvalds 已提交
21 22 23

struct mempolicy;
struct anon_vma;
A
Alexey Dobriyan 已提交
24
struct file_ra_state;
A
Alexey Dobriyan 已提交
25
struct user_struct;
A
Alexey Dobriyan 已提交
26
struct writeback_control;
L
Linus Torvalds 已提交
27 28 29 30 31 32

#ifndef CONFIG_DISCONTIGMEM          /* Don't use mapnrs, do it properly */
extern unsigned long max_mapnr;
#endif

extern unsigned long num_physpages;
33
extern unsigned long totalram_pages;
L
Linus Torvalds 已提交
34 35 36 37 38 39 40 41 42 43 44 45 46 47 48
extern void * high_memory;
extern int page_cluster;

#ifdef CONFIG_SYSCTL
extern int sysctl_legacy_va_layout;
#else
#define sysctl_legacy_va_layout 0
#endif

#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/processor.h>

#define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n))

49 50 51
/* to align the pointer to the (next) page boundary */
#define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE)

L
Linus Torvalds 已提交
52 53 54 55 56 57 58 59 60
/*
 * Linux kernel virtual memory manager primitives.
 * The idea being to have a "virtual" mm in the same way
 * we have a virtual fs - giving a cleaner interface to the
 * mm details, and allowing different kinds of memory mappings
 * (from shared memory to executable loading to arbitrary
 * mmap() functions).
 */

61 62
extern struct kmem_cache *vm_area_cachep;

L
Linus Torvalds 已提交
63
#ifndef CONFIG_MMU
64 65
extern struct rb_root nommu_region_tree;
extern struct rw_semaphore nommu_region_sem;
L
Linus Torvalds 已提交
66 67 68 69 70

extern unsigned int kobjsize(const void *objp);
#endif

/*
H
Hugh Dickins 已提交
71
 * vm_flags in vm_area_struct, see mm_types.h.
L
Linus Torvalds 已提交
72 73 74 75 76 77
 */
#define VM_READ		0x00000001	/* currently active flags */
#define VM_WRITE	0x00000002
#define VM_EXEC		0x00000004
#define VM_SHARED	0x00000008

78
/* mprotect() hardcodes VM_MAYREAD >> 4 == VM_READ, and so for r/w/x bits. */
L
Linus Torvalds 已提交
79 80 81 82 83 84
#define VM_MAYREAD	0x00000010	/* limits for mprotect() etc */
#define VM_MAYWRITE	0x00000020
#define VM_MAYEXEC	0x00000040
#define VM_MAYSHARE	0x00000080

#define VM_GROWSDOWN	0x00000100	/* general info on the segment */
85
#if defined(CONFIG_STACK_GROWSUP) || defined(CONFIG_IA64)
L
Linus Torvalds 已提交
86
#define VM_GROWSUP	0x00000200
87 88
#else
#define VM_GROWSUP	0x00000000
A
Andrea Arcangeli 已提交
89
#define VM_NOHUGEPAGE	0x00000200	/* MADV_NOHUGEPAGE marked this vma */
90
#endif
91
#define VM_PFNMAP	0x00000400	/* Page-ranges managed without "struct page", just pure PFN */
L
Linus Torvalds 已提交
92 93 94 95 96 97 98 99 100 101 102 103
#define VM_DENYWRITE	0x00000800	/* ETXTBSY on write attempts.. */

#define VM_EXECUTABLE	0x00001000
#define VM_LOCKED	0x00002000
#define VM_IO           0x00004000	/* Memory mapped I/O or similar */

					/* Used by sys_madvise() */
#define VM_SEQ_READ	0x00008000	/* App will access data sequentially */
#define VM_RAND_READ	0x00010000	/* App will not benefit from clustered reads */

#define VM_DONTCOPY	0x00020000      /* Do not copy this vma on fork */
#define VM_DONTEXPAND	0x00040000	/* Cannot expand with mremap() */
H
Hugh Dickins 已提交
104
#define VM_RESERVED	0x00080000	/* Count as reserved_vm like IO */
L
Linus Torvalds 已提交
105
#define VM_ACCOUNT	0x00100000	/* Is a VM accounted object */
106
#define VM_NORESERVE	0x00200000	/* should the VM suppress accounting */
L
Linus Torvalds 已提交
107 108
#define VM_HUGETLB	0x00400000	/* Huge TLB Page VM */
#define VM_NONLINEAR	0x00800000	/* Is non-linear (remap_file_pages) */
J
Johannes Weiner 已提交
109
#ifndef CONFIG_TRANSPARENT_HUGEPAGE
L
Linus Torvalds 已提交
110
#define VM_MAPPED_COPY	0x01000000	/* T if mapped copy of data (nommu mmap) */
J
Johannes Weiner 已提交
111 112 113
#else
#define VM_HUGEPAGE	0x01000000	/* MADV_HUGEPAGE marked this vma */
#endif
114
#define VM_INSERTPAGE	0x02000000	/* The vma has had "vm_insert_page()" done on it */
115
#define VM_NODUMP	0x04000000	/* Do not include in the core dump */
116

N
Nick Piggin 已提交
117
#define VM_CAN_NONLINEAR 0x08000000	/* Has ->fault & does nonlinear pages */
J
Jared Hulbert 已提交
118
#define VM_MIXEDMAP	0x10000000	/* Can contain "struct page" and pure PFN pages */
119
#define VM_SAO		0x20000000	/* Strong Access Ordering (powerpc) */
120
#define VM_PFN_AT_MMAP	0x40000000	/* PFNMAP vma that is fully mapped at mmap time */
H
Hugh Dickins 已提交
121
#define VM_MERGEABLE	0x80000000	/* KSM may merge identical pages */
L
Linus Torvalds 已提交
122

123 124 125
/* Bits set in the VMA until the stack is in its final location */
#define VM_STACK_INCOMPLETE_SETUP	(VM_RAND_READ | VM_SEQ_READ)

L
Linus Torvalds 已提交
126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141
#ifndef VM_STACK_DEFAULT_FLAGS		/* arch can override this */
#define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS
#endif

#ifdef CONFIG_STACK_GROWSUP
#define VM_STACK_FLAGS	(VM_GROWSUP | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT)
#else
#define VM_STACK_FLAGS	(VM_GROWSDOWN | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT)
#endif

#define VM_READHINTMASK			(VM_SEQ_READ | VM_RAND_READ)
#define VM_ClearReadHint(v)		(v)->vm_flags &= ~VM_READHINTMASK
#define VM_NormalReadHint(v)		(!((v)->vm_flags & VM_READHINTMASK))
#define VM_SequentialReadHint(v)	((v)->vm_flags & VM_SEQ_READ)
#define VM_RandomReadHint(v)		((v)->vm_flags & VM_RAND_READ)

N
Nick Piggin 已提交
142
/*
143 144
 * Special vmas that are non-mergable, non-mlock()able.
 * Note: mm/huge_memory.c VM_NO_THP depends on this definition.
N
Nick Piggin 已提交
145 146 147
 */
#define VM_SPECIAL (VM_IO | VM_DONTEXPAND | VM_RESERVED | VM_PFNMAP)

L
Linus Torvalds 已提交
148 149 150 151 152 153
/*
 * mapping from the currently active vm_flags protection bits (the
 * low four bits) to a page protection mask..
 */
extern pgprot_t protection_map[16];

N
Nick Piggin 已提交
154 155
#define FAULT_FLAG_WRITE	0x01	/* Fault was a write access */
#define FAULT_FLAG_NONLINEAR	0x02	/* Fault was via a nonlinear mapping */
156
#define FAULT_FLAG_MKWRITE	0x04	/* Fault was mkwrite of existing pte */
157
#define FAULT_FLAG_ALLOW_RETRY	0x08	/* Retry fault if blocking */
158
#define FAULT_FLAG_RETRY_NOWAIT	0x10	/* Don't drop mmap_sem and wait when retrying */
159
#define FAULT_FLAG_KILLABLE	0x20	/* The fault task is in SIGKILL killable region */
N
Nick Piggin 已提交
160

161 162 163 164 165 166 167 168
/*
 * This interface is used by x86 PAT code to identify a pfn mapping that is
 * linear over entire vma. This is to optimize PAT code that deals with
 * marking the physical region with a particular prot. This is not for generic
 * mm use. Note also that this check will not work if the pfn mapping is
 * linear for a vma starting at physical address 0. In which case PAT code
 * falls back to slow path of reserving physical range page by page.
 */
169 170
static inline int is_linear_pfn_mapping(struct vm_area_struct *vma)
{
171
	return !!(vma->vm_flags & VM_PFN_AT_MMAP);
172 173 174 175
}

static inline int is_pfn_mapping(struct vm_area_struct *vma)
{
176
	return !!(vma->vm_flags & VM_PFNMAP);
177
}
N
Nick Piggin 已提交
178

179
/*
N
Nick Piggin 已提交
180
 * vm_fault is filled by the the pagefault handler and passed to the vma's
N
Nick Piggin 已提交
181 182
 * ->fault function. The vma's ->fault is responsible for returning a bitmask
 * of VM_FAULT_xxx flags that give details about how the fault was handled.
183
 *
N
Nick Piggin 已提交
184 185 186
 * pgoff should be used in favour of virtual_address, if possible. If pgoff
 * is used, one may set VM_CAN_NONLINEAR in the vma->vm_flags to get nonlinear
 * mapping support.
187
 */
N
Nick Piggin 已提交
188 189 190 191 192 193
struct vm_fault {
	unsigned int flags;		/* FAULT_FLAG_xxx flags */
	pgoff_t pgoff;			/* Logical page offset based on vma */
	void __user *virtual_address;	/* Faulting virtual address */

	struct page *page;		/* ->fault handlers should return a
N
Nick Piggin 已提交
194
					 * page here, unless VM_FAULT_NOPAGE
N
Nick Piggin 已提交
195
					 * is set (which is also implied by
N
Nick Piggin 已提交
196
					 * VM_FAULT_ERROR).
N
Nick Piggin 已提交
197
					 */
198
};
L
Linus Torvalds 已提交
199 200 201 202 203 204 205 206 207

/*
 * These are the virtual MM functions - opening of an area, closing and
 * unmapping it (needed to keep files on disk up-to-date etc), pointer
 * to the functions called when a no-page or a wp-page exception occurs. 
 */
struct vm_operations_struct {
	void (*open)(struct vm_area_struct * area);
	void (*close)(struct vm_area_struct * area);
N
Nick Piggin 已提交
208
	int (*fault)(struct vm_area_struct *vma, struct vm_fault *vmf);
209 210 211

	/* notification that a previously read-only page is about to become
	 * writable, if an error is returned it will cause a SIGBUS */
212
	int (*page_mkwrite)(struct vm_area_struct *vma, struct vm_fault *vmf);
213 214 215 216 217 218

	/* called by access_process_vm when get_user_pages() fails, typically
	 * for use by special VMAs that can switch between memory and hardware
	 */
	int (*access)(struct vm_area_struct *vma, unsigned long addr,
		      void *buf, int len, int write);
L
Linus Torvalds 已提交
219
#ifdef CONFIG_NUMA
220 221 222 223 224 225 226
	/*
	 * set_policy() op must add a reference to any non-NULL @new mempolicy
	 * to hold the policy upon return.  Caller should pass NULL @new to
	 * remove a policy and fall back to surrounding context--i.e. do not
	 * install a MPOL_DEFAULT policy, nor the task or system default
	 * mempolicy.
	 */
L
Linus Torvalds 已提交
227
	int (*set_policy)(struct vm_area_struct *vma, struct mempolicy *new);
228 229 230 231 232 233 234 235 236 237 238

	/*
	 * get_policy() op must add reference [mpol_get()] to any policy at
	 * (vma,addr) marked as MPOL_SHARED.  The shared policy infrastructure
	 * in mm/mempolicy.c will do this automatically.
	 * get_policy() must NOT add a ref if the policy at (vma,addr) is not
	 * marked as MPOL_SHARED. vma policies are protected by the mmap_sem.
	 * If no [shared/vma] mempolicy exists at the addr, get_policy() op
	 * must return NULL--i.e., do not "fallback" to task or system default
	 * policy.
	 */
L
Linus Torvalds 已提交
239 240
	struct mempolicy *(*get_policy)(struct vm_area_struct *vma,
					unsigned long addr);
241 242
	int (*migrate)(struct vm_area_struct *vma, const nodemask_t *from,
		const nodemask_t *to, unsigned long flags);
L
Linus Torvalds 已提交
243 244 245 246 247 248
#endif
};

struct mmu_gather;
struct inode;

A
Andrew Morton 已提交
249 250
#define page_private(page)		((page)->private)
#define set_page_private(page, v)	((page)->private = (v))
H
Hugh Dickins 已提交
251

L
Linus Torvalds 已提交
252 253 254 255 256
/*
 * FIXME: take this include out, include page-flags.h in
 * files which need it (119 of them)
 */
#include <linux/page-flags.h>
257
#include <linux/huge_mm.h>
L
Linus Torvalds 已提交
258 259 260 261 262 263 264 265 266 267 268 269 270 271 272

/*
 * Methods to modify the page usage count.
 *
 * What counts for a page usage:
 * - cache mapping   (page->mapping)
 * - private data    (page->private)
 * - page mapped in a task's page tables, each mapping
 *   is counted separately
 *
 * Also, many kernel routines increase the page count before a critical
 * routine so they can be sure the page doesn't go away from under them.
 */

/*
N
Nick Piggin 已提交
273
 * Drop a ref, return true if the refcount fell to zero (the page has no users)
L
Linus Torvalds 已提交
274
 */
275 276
static inline int put_page_testzero(struct page *page)
{
N
Nick Piggin 已提交
277
	VM_BUG_ON(atomic_read(&page->_count) == 0);
278
	return atomic_dec_and_test(&page->_count);
279
}
L
Linus Torvalds 已提交
280 281

/*
282 283
 * Try to grab a ref unless the page has a refcount of zero, return false if
 * that is the case.
L
Linus Torvalds 已提交
284
 */
285 286
static inline int get_page_unless_zero(struct page *page)
{
287
	return atomic_inc_not_zero(&page->_count);
288
}
L
Linus Torvalds 已提交
289

290 291
extern int page_is_ram(unsigned long pfn);

292
/* Support for virtually mapped pages */
293 294
struct page *vmalloc_to_page(const void *addr);
unsigned long vmalloc_to_pfn(const void *addr);
295

296 297 298 299 300 301
/*
 * Determine if an address is within the vmalloc range
 *
 * On nommu, vmalloc/vfree wrap through kmalloc/kfree directly, so there
 * is no special casing required.
 */
302 303
static inline int is_vmalloc_addr(const void *x)
{
304
#ifdef CONFIG_MMU
305 306 307
	unsigned long addr = (unsigned long)x;

	return addr >= VMALLOC_START && addr < VMALLOC_END;
308 309
#else
	return 0;
310
#endif
311
}
312 313 314
#ifdef CONFIG_MMU
extern int is_vmalloc_or_module_addr(const void *x);
#else
315
static inline int is_vmalloc_or_module_addr(const void *x)
316 317 318 319
{
	return 0;
}
#endif
320

A
Andrea Arcangeli 已提交
321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353
static inline void compound_lock(struct page *page)
{
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
	bit_spin_lock(PG_compound_lock, &page->flags);
#endif
}

static inline void compound_unlock(struct page *page)
{
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
	bit_spin_unlock(PG_compound_lock, &page->flags);
#endif
}

static inline unsigned long compound_lock_irqsave(struct page *page)
{
	unsigned long uninitialized_var(flags);
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
	local_irq_save(flags);
	compound_lock(page);
#endif
	return flags;
}

static inline void compound_unlock_irqrestore(struct page *page,
					      unsigned long flags)
{
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
	compound_unlock(page);
	local_irq_restore(flags);
#endif
}

354 355
static inline struct page *compound_head(struct page *page)
{
356
	if (unlikely(PageTail(page)))
357 358 359 360
		return page->first_page;
	return page;
}

361 362 363 364 365 366 367 368 369 370 371 372 373 374 375
/*
 * The atomic page->_mapcount, starts from -1: so that transitions
 * both from it and to it can be tracked, using atomic_inc_and_test
 * and atomic_add_negative(-1).
 */
static inline void reset_page_mapcount(struct page *page)
{
	atomic_set(&(page)->_mapcount, -1);
}

static inline int page_mapcount(struct page *page)
{
	return atomic_read(&(page)->_mapcount) + 1;
}

H
Hugh Dickins 已提交
376
static inline int page_count(struct page *page)
L
Linus Torvalds 已提交
377
{
378
	return atomic_read(&compound_head(page)->_count);
L
Linus Torvalds 已提交
379 380
}

A
Andrea Arcangeli 已提交
381 382 383 384 385 386 387 388 389 390 391
static inline void get_huge_page_tail(struct page *page)
{
	/*
	 * __split_huge_page_refcount() cannot run
	 * from under us.
	 */
	VM_BUG_ON(page_mapcount(page) < 0);
	VM_BUG_ON(atomic_read(&page->_count) != 0);
	atomic_inc(&page->_mapcount);
}

392 393
extern bool __get_page_tail(struct page *page);

L
Linus Torvalds 已提交
394 395
static inline void get_page(struct page *page)
{
396 397 398
	if (unlikely(PageTail(page)))
		if (likely(__get_page_tail(page)))
			return;
399 400
	/*
	 * Getting a normal page or the head of a compound page
401
	 * requires to already have an elevated page->_count.
402
	 */
403
	VM_BUG_ON(atomic_read(&page->_count) <= 0);
L
Linus Torvalds 已提交
404 405 406
	atomic_inc(&page->_count);
}

407 408 409 410 411 412
static inline struct page *virt_to_head_page(const void *x)
{
	struct page *page = virt_to_page(x);
	return compound_head(page);
}

413 414 415 416 417 418 419 420 421
/*
 * Setup the page count before being freed into the page allocator for
 * the first time (boot or memory hotplug)
 */
static inline void init_page_count(struct page *page)
{
	atomic_set(&page->_count, 1);
}

A
Andrea Arcangeli 已提交
422 423 424
/*
 * PageBuddy() indicate that the page is free and in the buddy system
 * (see mm/page_alloc.c).
425 426 427 428 429
 *
 * PAGE_BUDDY_MAPCOUNT_VALUE must be <= -2 but better not too close to
 * -2 so that an underflow of the page_mapcount() won't be mistaken
 * for a genuine PAGE_BUDDY_MAPCOUNT_VALUE. -128 can be created very
 * efficiently by most CPU architectures.
A
Andrea Arcangeli 已提交
430
 */
431 432
#define PAGE_BUDDY_MAPCOUNT_VALUE (-128)

A
Andrea Arcangeli 已提交
433 434
static inline int PageBuddy(struct page *page)
{
435
	return atomic_read(&page->_mapcount) == PAGE_BUDDY_MAPCOUNT_VALUE;
A
Andrea Arcangeli 已提交
436 437 438 439 440
}

static inline void __SetPageBuddy(struct page *page)
{
	VM_BUG_ON(atomic_read(&page->_mapcount) != -1);
441
	atomic_set(&page->_mapcount, PAGE_BUDDY_MAPCOUNT_VALUE);
A
Andrea Arcangeli 已提交
442 443 444 445 446 447 448 449
}

static inline void __ClearPageBuddy(struct page *page)
{
	VM_BUG_ON(!PageBuddy(page));
	atomic_set(&page->_mapcount, -1);
}

L
Linus Torvalds 已提交
450
void put_page(struct page *page);
451
void put_pages_list(struct list_head *pages);
L
Linus Torvalds 已提交
452

N
Nick Piggin 已提交
453
void split_page(struct page *page, unsigned int order);
454
int split_free_page(struct page *page);
N
Nick Piggin 已提交
455

456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473
/*
 * Compound pages have a destructor function.  Provide a
 * prototype for that function and accessor functions.
 * These are _only_ valid on the head of a PG_compound page.
 */
typedef void compound_page_dtor(struct page *);

static inline void set_compound_page_dtor(struct page *page,
						compound_page_dtor *dtor)
{
	page[1].lru.next = (void *)dtor;
}

static inline compound_page_dtor *get_compound_page_dtor(struct page *page)
{
	return (compound_page_dtor *)page[1].lru.next;
}

474 475
static inline int compound_order(struct page *page)
{
476
	if (!PageHead(page))
477 478 479 480
		return 0;
	return (unsigned long)page[1].lru.prev;
}

A
Andrea Arcangeli 已提交
481 482 483 484 485 486 487 488 489 490 491 492 493 494
static inline int compound_trans_order(struct page *page)
{
	int order;
	unsigned long flags;

	if (!PageHead(page))
		return 0;

	flags = compound_lock_irqsave(page);
	order = compound_order(page);
	compound_unlock_irqrestore(page, flags);
	return order;
}

495 496 497 498 499
static inline void set_compound_order(struct page *page, unsigned long order)
{
	page[1].lru.prev = (void *)order;
}

500
#ifdef CONFIG_MMU
A
Andrea Arcangeli 已提交
501 502 503 504 505 506 507 508 509 510 511 512
/*
 * Do pte_mkwrite, but only if the vma says VM_WRITE.  We do this when
 * servicing faults for write access.  In the normal case, do always want
 * pte_mkwrite.  But get_user_pages can cause write faults for mappings
 * that do not have writing enabled, when used by access_process_vm.
 */
static inline pte_t maybe_mkwrite(pte_t pte, struct vm_area_struct *vma)
{
	if (likely(vma->vm_flags & VM_WRITE))
		pte = pte_mkwrite(pte);
	return pte;
}
513
#endif
A
Andrea Arcangeli 已提交
514

L
Linus Torvalds 已提交
515 516 517 518 519 520 521
/*
 * Multiple processes may "see" the same page. E.g. for untouched
 * mappings of /dev/null, all processes see the same page full of
 * zeroes, and text pages of executables and shared libraries have
 * only one copy in memory, at most, normally.
 *
 * For the non-reserved pages, page_count(page) denotes a reference count.
522 523
 *   page_count() == 0 means the page is free. page->lru is then used for
 *   freelist management in the buddy allocator.
N
Nick Piggin 已提交
524
 *   page_count() > 0  means the page has been allocated.
L
Linus Torvalds 已提交
525
 *
N
Nick Piggin 已提交
526 527 528 529 530
 * Pages are allocated by the slab allocator in order to provide memory
 * to kmalloc and kmem_cache_alloc. In this case, the management of the
 * page, and the fields in 'struct page' are the responsibility of mm/slab.c
 * unless a particular usage is carefully commented. (the responsibility of
 * freeing the kmalloc memory is the caller's, of course).
L
Linus Torvalds 已提交
531
 *
N
Nick Piggin 已提交
532 533 534 535 536 537 538 539 540
 * A page may be used by anyone else who does a __get_free_page().
 * In this case, page_count still tracks the references, and should only
 * be used through the normal accessor functions. The top bits of page->flags
 * and page->virtual store page management information, but all other fields
 * are unused and could be used privately, carefully. The management of this
 * page is the responsibility of the one who allocated it, and those who have
 * subsequently been given references to it.
 *
 * The other pages (we may call them "pagecache pages") are completely
L
Linus Torvalds 已提交
541 542 543
 * managed by the Linux memory manager: I/O, buffers, swapping etc.
 * The following discussion applies only to them.
 *
N
Nick Piggin 已提交
544 545 546 547
 * A pagecache page contains an opaque `private' member, which belongs to the
 * page's address_space. Usually, this is the address of a circular list of
 * the page's disk buffers. PG_private must be set to tell the VM to call
 * into the filesystem to release these pages.
L
Linus Torvalds 已提交
548
 *
N
Nick Piggin 已提交
549 550 551
 * A page may belong to an inode's memory mapping. In this case, page->mapping
 * is the pointer to the inode, and page->index is the file offset of the page,
 * in units of PAGE_CACHE_SIZE.
L
Linus Torvalds 已提交
552
 *
N
Nick Piggin 已提交
553 554 555
 * If pagecache pages are not associated with an inode, they are said to be
 * anonymous pages. These may become associated with the swapcache, and in that
 * case PG_swapcache is set, and page->private is an offset into the swapcache.
L
Linus Torvalds 已提交
556
 *
N
Nick Piggin 已提交
557 558 559
 * In either case (swapcache or inode backed), the pagecache itself holds one
 * reference to the page. Setting PG_private should also increment the
 * refcount. The each user mapping also has a reference to the page.
L
Linus Torvalds 已提交
560
 *
N
Nick Piggin 已提交
561 562 563 564
 * The pagecache pages are stored in a per-mapping radix tree, which is
 * rooted at mapping->page_tree, and indexed by offset.
 * Where 2.4 and early 2.6 kernels kept dirty/clean pages in per-address_space
 * lists, we instead now tag pages as dirty/writeback in the radix tree.
L
Linus Torvalds 已提交
565
 *
N
Nick Piggin 已提交
566
 * All pagecache pages may be subject to I/O:
L
Linus Torvalds 已提交
567 568
 * - inode pages may need to be read from disk,
 * - inode pages which have been modified and are MAP_SHARED may need
N
Nick Piggin 已提交
569 570 571 572
 *   to be written back to the inode on disk,
 * - anonymous pages (including MAP_PRIVATE file mappings) which have been
 *   modified may need to be swapped out to swap space and (later) to be read
 *   back into memory.
L
Linus Torvalds 已提交
573 574 575 576 577 578
 */

/*
 * The zone field is never updated after free_area_init_core()
 * sets it, so none of the operations on it need to be atomic.
 */
579

A
Andy Whitcroft 已提交
580 581 582 583 584 585 586 587 588 589 590

/*
 * page->flags layout:
 *
 * There are three possibilities for how page->flags get
 * laid out.  The first is for the normal case, without
 * sparsemem.  The second is for sparsemem when there is
 * plenty of space for node and section.  The last is when
 * we have run out of space and have to fall back to an
 * alternate (slower) way of determining the node.
 *
591 592 593
 * No sparsemem or sparsemem vmemmap: |       NODE     | ZONE | ... | FLAGS |
 * classic sparse with space for node:| SECTION | NODE | ZONE | ... | FLAGS |
 * classic sparse no space for node:  | SECTION |     ZONE    | ... | FLAGS |
A
Andy Whitcroft 已提交
594
 */
595
#if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP)
A
Andy Whitcroft 已提交
596 597 598 599 600 601 602
#define SECTIONS_WIDTH		SECTIONS_SHIFT
#else
#define SECTIONS_WIDTH		0
#endif

#define ZONES_WIDTH		ZONES_SHIFT

603
#if SECTIONS_WIDTH+ZONES_WIDTH+NODES_SHIFT <= BITS_PER_LONG - NR_PAGEFLAGS
A
Andy Whitcroft 已提交
604 605
#define NODES_WIDTH		NODES_SHIFT
#else
606 607 608
#ifdef CONFIG_SPARSEMEM_VMEMMAP
#error "Vmemmap: No space for nodes field in page flags"
#endif
A
Andy Whitcroft 已提交
609 610 611 612
#define NODES_WIDTH		0
#endif

/* Page flags: | [SECTION] | [NODE] | ZONE | ... | FLAGS | */
613
#define SECTIONS_PGOFF		((sizeof(unsigned long)*8) - SECTIONS_WIDTH)
A
Andy Whitcroft 已提交
614 615 616 617 618 619 620
#define NODES_PGOFF		(SECTIONS_PGOFF - NODES_WIDTH)
#define ZONES_PGOFF		(NODES_PGOFF - ZONES_WIDTH)

/*
 * We are going to use the flags for the page to node mapping if its in
 * there.  This includes the case where there is no node, so it is implicit.
 */
621 622 623
#if !(NODES_WIDTH > 0 || NODES_SHIFT == 0)
#define NODE_NOT_IN_PAGE_FLAGS
#endif
A
Andy Whitcroft 已提交
624

625
/*
L
Lucas De Marchi 已提交
626
 * Define the bit shifts to access each section.  For non-existent
627 628 629
 * sections we define the shift as 0; that plus a 0 mask ensures
 * the compiler will optimise away reference to them.
 */
A
Andy Whitcroft 已提交
630 631 632
#define SECTIONS_PGSHIFT	(SECTIONS_PGOFF * (SECTIONS_WIDTH != 0))
#define NODES_PGSHIFT		(NODES_PGOFF * (NODES_WIDTH != 0))
#define ZONES_PGSHIFT		(ZONES_PGOFF * (ZONES_WIDTH != 0))
633

634 635
/* NODE:ZONE or SECTION:ZONE is used to ID a zone for the buddy allocator */
#ifdef NODE_NOT_IN_PAGE_FLAGS
636
#define ZONEID_SHIFT		(SECTIONS_SHIFT + ZONES_SHIFT)
637 638
#define ZONEID_PGOFF		((SECTIONS_PGOFF < ZONES_PGOFF)? \
						SECTIONS_PGOFF : ZONES_PGOFF)
A
Andy Whitcroft 已提交
639
#else
640
#define ZONEID_SHIFT		(NODES_SHIFT + ZONES_SHIFT)
641 642
#define ZONEID_PGOFF		((NODES_PGOFF < ZONES_PGOFF)? \
						NODES_PGOFF : ZONES_PGOFF)
643 644
#endif

645
#define ZONEID_PGSHIFT		(ZONEID_PGOFF * (ZONEID_SHIFT != 0))
646

647 648
#if SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS
#error SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS
649 650
#endif

A
Andy Whitcroft 已提交
651 652 653
#define ZONES_MASK		((1UL << ZONES_WIDTH) - 1)
#define NODES_MASK		((1UL << NODES_WIDTH) - 1)
#define SECTIONS_MASK		((1UL << SECTIONS_WIDTH) - 1)
654
#define ZONEID_MASK		((1UL << ZONEID_SHIFT) - 1)
655

I
Ian Campbell 已提交
656
static inline enum zone_type page_zonenum(const struct page *page)
L
Linus Torvalds 已提交
657
{
658
	return (page->flags >> ZONES_PGSHIFT) & ZONES_MASK;
L
Linus Torvalds 已提交
659 660
}

661 662 663 664 665 666 667 668
/*
 * The identification function is only used by the buddy allocator for
 * determining if two pages could be buddies. We are not really
 * identifying a zone since we could be using a the section number
 * id if we have not node id available in page flags.
 * We guarantee only that it will return the same value for two
 * combinable pages in a zone.
 */
669 670
static inline int page_zone_id(struct page *page)
{
671
	return (page->flags >> ZONEID_PGSHIFT) & ZONEID_MASK;
672 673
}

674
static inline int zone_to_nid(struct zone *zone)
675
{
676 677 678 679 680
#ifdef CONFIG_NUMA
	return zone->node;
#else
	return 0;
#endif
681 682
}

683
#ifdef NODE_NOT_IN_PAGE_FLAGS
I
Ian Campbell 已提交
684
extern int page_to_nid(const struct page *page);
685
#else
I
Ian Campbell 已提交
686
static inline int page_to_nid(const struct page *page)
A
Andy Whitcroft 已提交
687
{
688
	return (page->flags >> NODES_PGSHIFT) & NODES_MASK;
A
Andy Whitcroft 已提交
689
}
690 691
#endif

I
Ian Campbell 已提交
692
static inline struct zone *page_zone(const struct page *page)
693 694 695 696
{
	return &NODE_DATA(page_to_nid(page))->node_zones[page_zonenum(page)];
}

697
#if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP)
698 699 700 701 702 703
static inline void set_page_section(struct page *page, unsigned long section)
{
	page->flags &= ~(SECTIONS_MASK << SECTIONS_PGSHIFT);
	page->flags |= (section & SECTIONS_MASK) << SECTIONS_PGSHIFT;
}

704
static inline unsigned long page_to_section(const struct page *page)
A
Andy Whitcroft 已提交
705 706 707
{
	return (page->flags >> SECTIONS_PGSHIFT) & SECTIONS_MASK;
}
708
#endif
A
Andy Whitcroft 已提交
709

710
static inline void set_page_zone(struct page *page, enum zone_type zone)
711 712 713 714
{
	page->flags &= ~(ZONES_MASK << ZONES_PGSHIFT);
	page->flags |= (zone & ZONES_MASK) << ZONES_PGSHIFT;
}
715

716 717 718 719
static inline void set_page_node(struct page *page, unsigned long node)
{
	page->flags &= ~(NODES_MASK << NODES_PGSHIFT);
	page->flags |= (node & NODES_MASK) << NODES_PGSHIFT;
L
Linus Torvalds 已提交
720
}
721

722
static inline void set_page_links(struct page *page, enum zone_type zone,
A
Andy Whitcroft 已提交
723
	unsigned long node, unsigned long pfn)
L
Linus Torvalds 已提交
724
{
725 726
	set_page_zone(page, zone);
	set_page_node(page, node);
727
#if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP)
A
Andy Whitcroft 已提交
728
	set_page_section(page, pfn_to_section_nr(pfn));
729
#endif
L
Linus Torvalds 已提交
730 731
}

732 733 734 735 736
/*
 * Some inline functions in vmstat.h depend on page_zone()
 */
#include <linux/vmstat.h>

I
Ian Campbell 已提交
737
static __always_inline void *lowmem_page_address(const struct page *page)
L
Linus Torvalds 已提交
738
{
739
	return __va(PFN_PHYS(page_to_pfn(page)));
L
Linus Torvalds 已提交
740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755
}

#if defined(CONFIG_HIGHMEM) && !defined(WANT_PAGE_VIRTUAL)
#define HASHED_PAGE_VIRTUAL
#endif

#if defined(WANT_PAGE_VIRTUAL)
#define page_address(page) ((page)->virtual)
#define set_page_address(page, address)			\
	do {						\
		(page)->virtual = (address);		\
	} while(0)
#define page_address_init()  do { } while(0)
#endif

#if defined(HASHED_PAGE_VIRTUAL)
756
void *page_address(const struct page *page);
L
Linus Torvalds 已提交
757 758 759 760 761 762 763 764 765 766 767 768 769
void set_page_address(struct page *page, void *virtual);
void page_address_init(void);
#endif

#if !defined(HASHED_PAGE_VIRTUAL) && !defined(WANT_PAGE_VIRTUAL)
#define page_address(page) lowmem_page_address(page)
#define set_page_address(page, address)  do { } while(0)
#define page_address_init()  do { } while(0)
#endif

/*
 * On an anonymous page mapped into a user virtual memory area,
 * page->mapping points to its anon_vma, not to a struct address_space;
H
Hugh Dickins 已提交
770 771 772 773 774 775 776 777
 * with the PAGE_MAPPING_ANON bit set to distinguish it.  See rmap.h.
 *
 * On an anonymous page in a VM_MERGEABLE area, if CONFIG_KSM is enabled,
 * the PAGE_MAPPING_KSM bit may be set along with the PAGE_MAPPING_ANON bit;
 * and then page->mapping points, not to an anon_vma, but to a private
 * structure which KSM associates with that merged page.  See ksm.h.
 *
 * PAGE_MAPPING_KSM without PAGE_MAPPING_ANON is currently never used.
L
Linus Torvalds 已提交
778 779 780 781 782 783
 *
 * Please note that, confusingly, "page_mapping" refers to the inode
 * address_space which maps the page from disk; whereas "page_mapped"
 * refers to user virtual address space into which the page is mapped.
 */
#define PAGE_MAPPING_ANON	1
H
Hugh Dickins 已提交
784 785
#define PAGE_MAPPING_KSM	2
#define PAGE_MAPPING_FLAGS	(PAGE_MAPPING_ANON | PAGE_MAPPING_KSM)
L
Linus Torvalds 已提交
786 787 788 789 790 791

extern struct address_space swapper_space;
static inline struct address_space *page_mapping(struct page *page)
{
	struct address_space *mapping = page->mapping;

792
	VM_BUG_ON(PageSlab(page));
L
Linus Torvalds 已提交
793 794
	if (unlikely(PageSwapCache(page)))
		mapping = &swapper_space;
795
	else if ((unsigned long)mapping & PAGE_MAPPING_ANON)
L
Linus Torvalds 已提交
796 797 798 799
		mapping = NULL;
	return mapping;
}

H
Hugh Dickins 已提交
800 801 802 803 804 805
/* Neutral page->mapping pointer to address_space or anon_vma or other */
static inline void *page_rmapping(struct page *page)
{
	return (void *)((unsigned long)page->mapping & ~PAGE_MAPPING_FLAGS);
}

L
Linus Torvalds 已提交
806 807 808 809 810 811 812 813 814 815 816 817
static inline int PageAnon(struct page *page)
{
	return ((unsigned long)page->mapping & PAGE_MAPPING_ANON) != 0;
}

/*
 * Return the pagecache index of the passed page.  Regular pagecache pages
 * use ->index whereas swapcache pages use ->private
 */
static inline pgoff_t page_index(struct page *page)
{
	if (unlikely(PageSwapCache(page)))
H
Hugh Dickins 已提交
818
		return page_private(page);
L
Linus Torvalds 已提交
819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834
	return page->index;
}

/*
 * Return true if this page is mapped into pagetables.
 */
static inline int page_mapped(struct page *page)
{
	return atomic_read(&(page)->_mapcount) >= 0;
}

/*
 * Different kinds of faults, as returned by handle_mm_fault().
 * Used to decide whether a process gets delivered SIGBUS or
 * just gets major/minor fault counters bumped up.
 */
N
Nick Piggin 已提交
835

N
Nick Piggin 已提交
836
#define VM_FAULT_MINOR	0 /* For backwards compat. Remove me quickly. */
N
Nick Piggin 已提交
837

N
Nick Piggin 已提交
838 839 840 841
#define VM_FAULT_OOM	0x0001
#define VM_FAULT_SIGBUS	0x0002
#define VM_FAULT_MAJOR	0x0004
#define VM_FAULT_WRITE	0x0008	/* Special case for get_user_pages */
842 843
#define VM_FAULT_HWPOISON 0x0010	/* Hit poisoned small page */
#define VM_FAULT_HWPOISON_LARGE 0x0020  /* Hit poisoned large page. Index encoded in upper bits */
N
Nick Piggin 已提交
844

N
Nick Piggin 已提交
845 846
#define VM_FAULT_NOPAGE	0x0100	/* ->fault installed the pte, not return page */
#define VM_FAULT_LOCKED	0x0200	/* ->fault locked the returned page */
847
#define VM_FAULT_RETRY	0x0400	/* ->fault blocked, must retry */
L
Linus Torvalds 已提交
848

849 850 851 852 853 854 855 856
#define VM_FAULT_HWPOISON_LARGE_MASK 0xf000 /* encodes hpage index for large hwpoison */

#define VM_FAULT_ERROR	(VM_FAULT_OOM | VM_FAULT_SIGBUS | VM_FAULT_HWPOISON | \
			 VM_FAULT_HWPOISON_LARGE)

/* Encode hstate index for a hwpoisoned large page */
#define VM_FAULT_SET_HINDEX(x) ((x) << 12)
#define VM_FAULT_GET_HINDEX(x) (((x) >> 12) & 0xf)
N
Nick Piggin 已提交
857

858 859 860 861 862
/*
 * Can be called by the pagefault handler when it gets a VM_FAULT_OOM.
 */
extern void pagefault_out_of_memory(void);

L
Linus Torvalds 已提交
863 864
#define offset_in_page(p)	((unsigned long)(p) & ~PAGE_MASK)

865
/*
866
 * Flags passed to show_mem() and show_free_areas() to suppress output in
867 868 869 870
 * various contexts.
 */
#define SHOW_MEM_FILTER_NODES	(0x0001u)	/* filter disallowed nodes */

871 872
extern void show_free_areas(unsigned int flags);
extern bool skip_free_areas_node(unsigned int flags, int nid);
L
Linus Torvalds 已提交
873

H
Hugh Dickins 已提交
874
int shmem_lock(struct file *file, int lock, struct user_struct *user);
875
struct file *shmem_file_setup(const char *name, loff_t size, unsigned long flags);
L
Linus Torvalds 已提交
876 877
int shmem_zero_setup(struct vm_area_struct *);

A
Alexey Dobriyan 已提交
878
extern int can_do_mlock(void);
L
Linus Torvalds 已提交
879 880 881 882 883 884 885 886 887 888 889 890 891
extern int user_shm_lock(size_t, struct user_struct *);
extern void user_shm_unlock(size_t, struct user_struct *);

/*
 * Parameter block passed down to zap_pte_range in exceptional cases.
 */
struct zap_details {
	struct vm_area_struct *nonlinear_vma;	/* Check page->index if set */
	struct address_space *check_mapping;	/* Check page->mapping if set */
	pgoff_t	first_index;			/* Lowest page->index to unmap */
	pgoff_t last_index;			/* Highest page->index to unmap */
};

N
Nick Piggin 已提交
892 893 894
struct page *vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
		pte_t pte);

895 896
int zap_vma_ptes(struct vm_area_struct *vma, unsigned long address,
		unsigned long size);
A
Al Viro 已提交
897
void zap_page_range(struct vm_area_struct *vma, unsigned long address,
L
Linus Torvalds 已提交
898
		unsigned long size, struct zap_details *);
899 900
void unmap_vmas(struct mmu_gather *tlb, struct vm_area_struct *start_vma,
		unsigned long start, unsigned long end);
901 902 903 904 905 906

/**
 * mm_walk - callbacks for walk_page_range
 * @pgd_entry: if set, called for each non-empty PGD (top-level) entry
 * @pud_entry: if set, called for each non-empty PUD (2nd-level) entry
 * @pmd_entry: if set, called for each non-empty PMD (3rd-level) entry
907 908 909
 *	       this handler is required to be able to handle
 *	       pmd_trans_huge() pmds.  They may simply choose to
 *	       split_huge_page() instead of handling it explicitly.
910 911
 * @pte_entry: if set, called for each non-empty PTE (4th-level) entry
 * @pte_hole: if set, called for each hole at all levels
912
 * @hugetlb_entry: if set, called for each hugetlb entry
913 914
 *		   *Caution*: The caller must hold mmap_sem() if @hugetlb_entry
 * 			      is used.
915 916 917 918
 *
 * (see walk_page_range for more details)
 */
struct mm_walk {
D
Dave Hansen 已提交
919 920 921 922 923
	int (*pgd_entry)(pgd_t *, unsigned long, unsigned long, struct mm_walk *);
	int (*pud_entry)(pud_t *, unsigned long, unsigned long, struct mm_walk *);
	int (*pmd_entry)(pmd_t *, unsigned long, unsigned long, struct mm_walk *);
	int (*pte_entry)(pte_t *, unsigned long, unsigned long, struct mm_walk *);
	int (*pte_hole)(unsigned long, unsigned long, struct mm_walk *);
924 925
	int (*hugetlb_entry)(pte_t *, unsigned long,
			     unsigned long, unsigned long, struct mm_walk *);
D
Dave Hansen 已提交
926 927
	struct mm_struct *mm;
	void *private;
928 929
};

D
Dave Hansen 已提交
930 931
int walk_page_range(unsigned long addr, unsigned long end,
		struct mm_walk *walk);
932
void free_pgd_range(struct mmu_gather *tlb, unsigned long addr,
933
		unsigned long end, unsigned long floor, unsigned long ceiling);
L
Linus Torvalds 已提交
934 935 936 937
int copy_page_range(struct mm_struct *dst, struct mm_struct *src,
			struct vm_area_struct *vma);
void unmap_mapping_range(struct address_space *mapping,
		loff_t const holebegin, loff_t const holelen, int even_cows);
J
Johannes Weiner 已提交
938 939
int follow_pfn(struct vm_area_struct *vma, unsigned long address,
	unsigned long *pfn);
940 941
int follow_phys(struct vm_area_struct *vma, unsigned long address,
		unsigned int flags, unsigned long *prot, resource_size_t *phys);
942 943
int generic_access_phys(struct vm_area_struct *vma, unsigned long addr,
			void *buf, int len, int write);
L
Linus Torvalds 已提交
944 945 946 947 948 949 950

static inline void unmap_shared_mapping_range(struct address_space *mapping,
		loff_t const holebegin, loff_t const holelen)
{
	unmap_mapping_range(mapping, holebegin, holelen, 0);
}

N
npiggin@suse.de 已提交
951
extern void truncate_pagecache(struct inode *inode, loff_t old, loff_t new);
952
extern void truncate_setsize(struct inode *inode, loff_t newsize);
N
npiggin@suse.de 已提交
953 954
extern int vmtruncate(struct inode *inode, loff_t offset);
extern int vmtruncate_range(struct inode *inode, loff_t offset, loff_t end);
955
void truncate_pagecache_range(struct inode *inode, loff_t offset, loff_t end);
956
int truncate_inode_page(struct address_space *mapping, struct page *page);
957
int generic_error_remove_page(struct address_space *mapping, struct page *page);
958

959 960
int invalidate_inode_page(struct page *page);

961
#ifdef CONFIG_MMU
N
Nick Piggin 已提交
962
extern int handle_mm_fault(struct mm_struct *mm, struct vm_area_struct *vma,
963
			unsigned long address, unsigned int flags);
964 965
extern int fixup_user_fault(struct task_struct *tsk, struct mm_struct *mm,
			    unsigned long address, unsigned int fault_flags);
966 967 968
#else
static inline int handle_mm_fault(struct mm_struct *mm,
			struct vm_area_struct *vma, unsigned long address,
969
			unsigned int flags)
970 971 972 973 974
{
	/* should never happen if there's no MMU */
	BUG();
	return VM_FAULT_SIGBUS;
}
975 976 977 978 979 980 981 982
static inline int fixup_user_fault(struct task_struct *tsk,
		struct mm_struct *mm, unsigned long address,
		unsigned int fault_flags)
{
	/* should never happen if there's no MMU */
	BUG();
	return -EFAULT;
}
983
#endif
N
Nick Piggin 已提交
984

L
Linus Torvalds 已提交
985 986
extern int make_pages_present(unsigned long addr, unsigned long end);
extern int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, int len, int write);
S
Stephen Wilson 已提交
987 988
extern int access_remote_vm(struct mm_struct *mm, unsigned long addr,
		void *buf, int len, int write);
L
Linus Torvalds 已提交
989

H
Huang Ying 已提交
990 991 992 993
int __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
		     unsigned long start, int len, unsigned int foll_flags,
		     struct page **pages, struct vm_area_struct **vmas,
		     int *nonblocking);
994
int get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
995
			unsigned long start, int nr_pages, int write, int force,
996 997 998
			struct page **pages, struct vm_area_struct **vmas);
int get_user_pages_fast(unsigned long start, int nr_pages, int write,
			struct page **pages);
H
Hugh Dickins 已提交
999
struct page *get_dump_page(unsigned long addr);
L
Linus Torvalds 已提交
1000

1001 1002 1003
extern int try_to_release_page(struct page * page, gfp_t gfp_mask);
extern void do_invalidatepage(struct page *page, unsigned long offset);

L
Linus Torvalds 已提交
1004
int __set_page_dirty_nobuffers(struct page *page);
1005
int __set_page_dirty_no_writeback(struct page *page);
L
Linus Torvalds 已提交
1006 1007
int redirty_page_for_writepage(struct writeback_control *wbc,
				struct page *page);
1008
void account_page_dirtied(struct page *page, struct address_space *mapping);
M
Michael Rubin 已提交
1009
void account_page_writeback(struct page *page);
1010
int set_page_dirty(struct page *page);
L
Linus Torvalds 已提交
1011 1012 1013
int set_page_dirty_lock(struct page *page);
int clear_page_dirty_for_io(struct page *page);

1014
/* Is the vma a continuation of the stack vma above it? */
1015
static inline int vma_growsdown(struct vm_area_struct *vma, unsigned long addr)
1016 1017 1018 1019
{
	return vma && (vma->vm_end == addr) && (vma->vm_flags & VM_GROWSDOWN);
}

1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041
static inline int stack_guard_page_start(struct vm_area_struct *vma,
					     unsigned long addr)
{
	return (vma->vm_flags & VM_GROWSDOWN) &&
		(vma->vm_start == addr) &&
		!vma_growsdown(vma->vm_prev, addr);
}

/* Is the vma a continuation of the stack vma below it? */
static inline int vma_growsup(struct vm_area_struct *vma, unsigned long addr)
{
	return vma && (vma->vm_start == addr) && (vma->vm_flags & VM_GROWSUP);
}

static inline int stack_guard_page_end(struct vm_area_struct *vma,
					   unsigned long addr)
{
	return (vma->vm_flags & VM_GROWSUP) &&
		(vma->vm_end == addr) &&
		!vma_growsup(vma->vm_next, addr);
}

1042 1043 1044
extern pid_t
vm_is_stack(struct task_struct *task, struct vm_area_struct *vma, int in_group);

1045 1046 1047
extern unsigned long move_page_tables(struct vm_area_struct *vma,
		unsigned long old_addr, struct vm_area_struct *new_vma,
		unsigned long new_addr, unsigned long len);
L
Linus Torvalds 已提交
1048 1049 1050
extern unsigned long do_mremap(unsigned long addr,
			       unsigned long old_len, unsigned long new_len,
			       unsigned long flags, unsigned long new_addr);
1051 1052 1053
extern int mprotect_fixup(struct vm_area_struct *vma,
			  struct vm_area_struct **pprev, unsigned long start,
			  unsigned long end, unsigned long newflags);
L
Linus Torvalds 已提交
1054

1055 1056 1057 1058 1059
/*
 * doesn't attempt to fault and will return short.
 */
int __get_user_pages_fast(unsigned long start, int nr_pages, int write,
			  struct page **pages);
K
KAMEZAWA Hiroyuki 已提交
1060 1061 1062 1063 1064
/*
 * per-process(per-mm_struct) statistics.
 */
static inline unsigned long get_mm_counter(struct mm_struct *mm, int member)
{
1065 1066 1067 1068 1069 1070 1071 1072 1073
	long val = atomic_long_read(&mm->rss_stat.count[member]);

#ifdef SPLIT_RSS_COUNTING
	/*
	 * counter is updated in asynchronous manner and may go to minus.
	 * But it's never be expected number for users.
	 */
	if (val < 0)
		val = 0;
1074
#endif
1075 1076
	return (unsigned long)val;
}
K
KAMEZAWA Hiroyuki 已提交
1077 1078 1079

static inline void add_mm_counter(struct mm_struct *mm, int member, long value)
{
1080
	atomic_long_add(value, &mm->rss_stat.count[member]);
K
KAMEZAWA Hiroyuki 已提交
1081 1082 1083 1084
}

static inline void inc_mm_counter(struct mm_struct *mm, int member)
{
1085
	atomic_long_inc(&mm->rss_stat.count[member]);
K
KAMEZAWA Hiroyuki 已提交
1086 1087 1088 1089
}

static inline void dec_mm_counter(struct mm_struct *mm, int member)
{
1090
	atomic_long_dec(&mm->rss_stat.count[member]);
K
KAMEZAWA Hiroyuki 已提交
1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131
}

static inline unsigned long get_mm_rss(struct mm_struct *mm)
{
	return get_mm_counter(mm, MM_FILEPAGES) +
		get_mm_counter(mm, MM_ANONPAGES);
}

static inline unsigned long get_mm_hiwater_rss(struct mm_struct *mm)
{
	return max(mm->hiwater_rss, get_mm_rss(mm));
}

static inline unsigned long get_mm_hiwater_vm(struct mm_struct *mm)
{
	return max(mm->hiwater_vm, mm->total_vm);
}

static inline void update_hiwater_rss(struct mm_struct *mm)
{
	unsigned long _rss = get_mm_rss(mm);

	if ((mm)->hiwater_rss < _rss)
		(mm)->hiwater_rss = _rss;
}

static inline void update_hiwater_vm(struct mm_struct *mm)
{
	if (mm->hiwater_vm < mm->total_vm)
		mm->hiwater_vm = mm->total_vm;
}

static inline void setmax_mm_hiwater_rss(unsigned long *maxrss,
					 struct mm_struct *mm)
{
	unsigned long hiwater_rss = get_mm_hiwater_rss(mm);

	if (*maxrss < hiwater_rss)
		*maxrss = hiwater_rss;
}

K
KAMEZAWA Hiroyuki 已提交
1132
#if defined(SPLIT_RSS_COUNTING)
1133
void sync_mm_rss(struct mm_struct *mm);
K
KAMEZAWA Hiroyuki 已提交
1134
#else
1135
static inline void sync_mm_rss(struct mm_struct *mm)
K
KAMEZAWA Hiroyuki 已提交
1136 1137 1138
{
}
#endif
1139

A
Alexey Dobriyan 已提交
1140
int vma_wants_writenotify(struct vm_area_struct *vma);
1141

1142 1143 1144 1145 1146 1147 1148 1149 1150
extern pte_t *__get_locked_pte(struct mm_struct *mm, unsigned long addr,
			       spinlock_t **ptl);
static inline pte_t *get_locked_pte(struct mm_struct *mm, unsigned long addr,
				    spinlock_t **ptl)
{
	pte_t *ptep;
	__cond_lock(*ptl, ptep = __get_locked_pte(mm, addr, ptl));
	return ptep;
}
1151

N
Nick Piggin 已提交
1152 1153 1154 1155 1156 1157 1158
#ifdef __PAGETABLE_PUD_FOLDED
static inline int __pud_alloc(struct mm_struct *mm, pgd_t *pgd,
						unsigned long address)
{
	return 0;
}
#else
1159
int __pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address);
N
Nick Piggin 已提交
1160 1161 1162 1163 1164 1165 1166 1167 1168
#endif

#ifdef __PAGETABLE_PMD_FOLDED
static inline int __pmd_alloc(struct mm_struct *mm, pud_t *pud,
						unsigned long address)
{
	return 0;
}
#else
1169
int __pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address);
N
Nick Piggin 已提交
1170 1171
#endif

1172 1173
int __pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,
		pmd_t *pmd, unsigned long address);
1174 1175
int __pte_alloc_kernel(pmd_t *pmd, unsigned long address);

L
Linus Torvalds 已提交
1176 1177 1178 1179
/*
 * The following ifdef needed to get the 4level-fixup.h header to work.
 * Remove it when 4level-fixup.h has been removed.
 */
1180
#if defined(CONFIG_MMU) && !defined(__ARCH_HAS_4LEVEL_HACK)
L
Linus Torvalds 已提交
1181 1182
static inline pud_t *pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address)
{
1183 1184
	return (unlikely(pgd_none(*pgd)) && __pud_alloc(mm, pgd, address))?
		NULL: pud_offset(pgd, address);
L
Linus Torvalds 已提交
1185 1186 1187 1188
}

static inline pmd_t *pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address)
{
1189 1190
	return (unlikely(pud_none(*pud)) && __pmd_alloc(mm, pud, address))?
		NULL: pmd_offset(pud, address);
L
Linus Torvalds 已提交
1191
}
1192 1193
#endif /* CONFIG_MMU && !__ARCH_HAS_4LEVEL_HACK */

1194
#if USE_SPLIT_PTLOCKS
H
Hugh Dickins 已提交
1195 1196 1197 1198 1199 1200
/*
 * We tuck a spinlock to guard each pagetable page into its struct page,
 * at page->private, with BUILD_BUG_ON to make sure that this will not
 * overflow into the next struct page (as it might with DEBUG_SPINLOCK).
 * When freeing, reset page->mapping so free_pages_check won't complain.
 */
A
Andrew Morton 已提交
1201
#define __pte_lockptr(page)	&((page)->ptl)
H
Hugh Dickins 已提交
1202 1203 1204 1205 1206
#define pte_lock_init(_page)	do {					\
	spin_lock_init(__pte_lockptr(_page));				\
} while (0)
#define pte_lock_deinit(page)	((page)->mapping = NULL)
#define pte_lockptr(mm, pmd)	({(void)(mm); __pte_lockptr(pmd_page(*(pmd)));})
1207
#else	/* !USE_SPLIT_PTLOCKS */
H
Hugh Dickins 已提交
1208 1209 1210 1211 1212 1213
/*
 * We use mm->page_table_lock to guard all pagetable pages of the mm.
 */
#define pte_lock_init(page)	do {} while (0)
#define pte_lock_deinit(page)	do {} while (0)
#define pte_lockptr(mm, pmd)	({(void)(pmd); &(mm)->page_table_lock;})
1214
#endif /* USE_SPLIT_PTLOCKS */
H
Hugh Dickins 已提交
1215

1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227
static inline void pgtable_page_ctor(struct page *page)
{
	pte_lock_init(page);
	inc_zone_page_state(page, NR_PAGETABLE);
}

static inline void pgtable_page_dtor(struct page *page)
{
	pte_lock_deinit(page);
	dec_zone_page_state(page, NR_PAGETABLE);
}

H
Hugh Dickins 已提交
1228 1229
#define pte_offset_map_lock(mm, pmd, address, ptlp)	\
({							\
H
Hugh Dickins 已提交
1230
	spinlock_t *__ptl = pte_lockptr(mm, pmd);	\
H
Hugh Dickins 已提交
1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241
	pte_t *__pte = pte_offset_map(pmd, address);	\
	*(ptlp) = __ptl;				\
	spin_lock(__ptl);				\
	__pte;						\
})

#define pte_unmap_unlock(pte, ptl)	do {		\
	spin_unlock(ptl);				\
	pte_unmap(pte);					\
} while (0)

1242 1243 1244 1245
#define pte_alloc_map(mm, vma, pmd, address)				\
	((unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, vma,	\
							pmd, address))?	\
	 NULL: pte_offset_map(pmd, address))
1246

H
Hugh Dickins 已提交
1247
#define pte_alloc_map_lock(mm, pmd, address, ptlp)	\
1248 1249
	((unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, NULL,	\
							pmd, address))?	\
H
Hugh Dickins 已提交
1250 1251
		NULL: pte_offset_map_lock(mm, pmd, address, ptlp))

1252
#define pte_alloc_kernel(pmd, address)			\
1253
	((unlikely(pmd_none(*(pmd))) && __pte_alloc_kernel(pmd, address))? \
1254
		NULL: pte_offset_kernel(pmd, address))
L
Linus Torvalds 已提交
1255 1256

extern void free_area_init(unsigned long * zones_size);
1257 1258
extern void free_area_init_node(int nid, unsigned long * zones_size,
		unsigned long zone_start_pfn, unsigned long *zholes_size);
1259 1260
extern void free_initmem(void);

T
Tejun Heo 已提交
1261
#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
1262
/*
T
Tejun Heo 已提交
1263
 * With CONFIG_HAVE_MEMBLOCK_NODE_MAP set, an architecture may initialise its
1264 1265 1266 1267 1268 1269
 * zones, allocate the backing mem_map and account for memory holes in a more
 * architecture independent manner. This is a substitute for creating the
 * zone_sizes[] and zholes_size[] arrays and passing them to
 * free_area_init_node()
 *
 * An architecture is expected to register range of page frames backed by
T
Tejun Heo 已提交
1270
 * physical memory with memblock_add[_node]() before calling
1271 1272 1273 1274 1275 1276
 * free_area_init_nodes() passing in the PFN each zone ends at. At a basic
 * usage, an architecture is expected to do something like
 *
 * unsigned long max_zone_pfns[MAX_NR_ZONES] = {max_dma, max_normal_pfn,
 * 							 max_highmem_pfn};
 * for_each_valid_physical_page_range()
T
Tejun Heo 已提交
1277
 * 	memblock_add_node(base, size, nid)
1278 1279
 * free_area_init_nodes(max_zone_pfns);
 *
T
Tejun Heo 已提交
1280 1281 1282 1283
 * free_bootmem_with_active_regions() calls free_bootmem_node() for each
 * registered physical page range.  Similarly
 * sparse_memory_present_with_active_regions() calls memory_present() for
 * each range when SPARSEMEM is enabled.
1284 1285
 *
 * See mm/page_alloc.c for more information on each function exposed by
T
Tejun Heo 已提交
1286
 * CONFIG_HAVE_MEMBLOCK_NODE_MAP.
1287 1288
 */
extern void free_area_init_nodes(unsigned long *max_zone_pfn);
1289
unsigned long node_map_pfn_alignment(void);
1290 1291
unsigned long __absent_pages_in_range(int nid, unsigned long start_pfn,
						unsigned long end_pfn);
1292 1293 1294 1295 1296 1297 1298 1299
extern unsigned long absent_pages_in_range(unsigned long start_pfn,
						unsigned long end_pfn);
extern void get_pfn_range_for_nid(unsigned int nid,
			unsigned long *start_pfn, unsigned long *end_pfn);
extern unsigned long find_min_pfn_with_active_regions(void);
extern void free_bootmem_with_active_regions(int nid,
						unsigned long max_low_pfn);
extern void sparse_memory_present_with_active_regions(int nid);
1300

T
Tejun Heo 已提交
1301
#endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
1302

T
Tejun Heo 已提交
1303
#if !defined(CONFIG_HAVE_MEMBLOCK_NODE_MAP) && \
1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317
    !defined(CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID)
static inline int __early_pfn_to_nid(unsigned long pfn)
{
	return 0;
}
#else
/* please see mm/page_alloc.c */
extern int __meminit early_pfn_to_nid(unsigned long pfn);
#ifdef CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID
/* there is a per-arch backend function. */
extern int __meminit __early_pfn_to_nid(unsigned long pfn);
#endif /* CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID */
#endif

1318
extern void set_dma_reserve(unsigned long new_dma_reserve);
D
Dave Hansen 已提交
1319 1320
extern void memmap_init_zone(unsigned long, int, unsigned long,
				unsigned long, enum memmap_context);
1321
extern void setup_per_zone_wmarks(void);
1322
extern int __meminit init_per_zone_wmark_min(void);
L
Linus Torvalds 已提交
1323
extern void mem_init(void);
1324
extern void __init mmap_init(void);
1325
extern void show_mem(unsigned int flags);
L
Linus Torvalds 已提交
1326 1327
extern void si_meminfo(struct sysinfo * val);
extern void si_meminfo_node(struct sysinfo *val, int nid);
1328
extern int after_bootmem;
L
Linus Torvalds 已提交
1329

J
Joe Perches 已提交
1330 1331
extern __printf(3, 4)
void warn_alloc_failed(gfp_t gfp_mask, int order, const char *fmt, ...);
1332

1333 1334
extern void setup_per_cpu_pageset(void);

1335 1336
extern void zone_pcp_update(struct zone *zone);

1337
/* nommu.c */
1338
extern atomic_long_t mmap_pages_allocated;
1339
extern int nommu_shrink_inode_mappings(struct inode *, size_t, size_t);
1340

L
Linus Torvalds 已提交
1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359
/* prio_tree.c */
void vma_prio_tree_add(struct vm_area_struct *, struct vm_area_struct *old);
void vma_prio_tree_insert(struct vm_area_struct *, struct prio_tree_root *);
void vma_prio_tree_remove(struct vm_area_struct *, struct prio_tree_root *);
struct vm_area_struct *vma_prio_tree_next(struct vm_area_struct *vma,
	struct prio_tree_iter *iter);

#define vma_prio_tree_foreach(vma, iter, root, begin, end)	\
	for (prio_tree_iter_init(iter, root, begin, end), vma = NULL;	\
		(vma = vma_prio_tree_next(vma, iter)); )

static inline void vma_nonlinear_insert(struct vm_area_struct *vma,
					struct list_head *list)
{
	vma->shared.vm_set.parent = NULL;
	list_add_tail(&vma->shared.vm_set.list, list);
}

/* mmap.c */
1360
extern int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin);
1361
extern int vma_adjust(struct vm_area_struct *vma, unsigned long start,
L
Linus Torvalds 已提交
1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372
	unsigned long end, pgoff_t pgoff, struct vm_area_struct *insert);
extern struct vm_area_struct *vma_merge(struct mm_struct *,
	struct vm_area_struct *prev, unsigned long addr, unsigned long end,
	unsigned long vm_flags, struct anon_vma *, struct file *, pgoff_t,
	struct mempolicy *);
extern struct anon_vma *find_mergeable_anon_vma(struct vm_area_struct *);
extern int split_vma(struct mm_struct *,
	struct vm_area_struct *, unsigned long addr, int new_below);
extern int insert_vm_struct(struct mm_struct *, struct vm_area_struct *);
extern void __vma_link_rb(struct mm_struct *, struct vm_area_struct *,
	struct rb_node **, struct rb_node *);
1373
extern void unlink_file_vma(struct vm_area_struct *);
L
Linus Torvalds 已提交
1374 1375 1376
extern struct vm_area_struct *copy_vma(struct vm_area_struct **,
	unsigned long addr, unsigned long len, pgoff_t pgoff);
extern void exit_mmap(struct mm_struct *);
M
Matt Helsley 已提交
1377

1378 1379 1380
extern int mm_take_all_locks(struct mm_struct *mm);
extern void mm_drop_all_locks(struct mm_struct *mm);

M
Matt Helsley 已提交
1381 1382 1383
/* From fs/proc/base.c. callers must _not_ hold the mm's exe_file_lock */
extern void added_exe_file_vma(struct mm_struct *mm);
extern void removed_exe_file_vma(struct mm_struct *mm);
1384 1385
extern void set_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file);
extern struct file *get_mm_exe_file(struct mm_struct *mm);
M
Matt Helsley 已提交
1386

A
akpm@osdl.org 已提交
1387
extern int may_expand_vm(struct mm_struct *mm, unsigned long npages);
1388 1389 1390
extern int install_special_mapping(struct mm_struct *mm,
				   unsigned long addr, unsigned long len,
				   unsigned long flags, struct page **pages);
L
Linus Torvalds 已提交
1391 1392 1393

extern unsigned long get_unmapped_area(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);

M
Miklos Szeredi 已提交
1394 1395
extern unsigned long mmap_region(struct file *file, unsigned long addr,
	unsigned long len, unsigned long flags,
1396
	vm_flags_t vm_flags, unsigned long pgoff);
1397 1398 1399
extern unsigned long do_mmap(struct file *, unsigned long,
        unsigned long, unsigned long,
        unsigned long, unsigned long);
L
Linus Torvalds 已提交
1400 1401
extern int do_munmap(struct mm_struct *, unsigned long, size_t);

1402 1403
/* These take the mm semaphore themselves */
extern unsigned long vm_brk(unsigned long, unsigned long);
A
Al Viro 已提交
1404
extern int vm_munmap(unsigned long, size_t);
1405 1406 1407
extern unsigned long vm_mmap(struct file *, unsigned long,
        unsigned long, unsigned long,
        unsigned long, unsigned long);
L
Linus Torvalds 已提交
1408

1409
/* truncate.c */
L
Linus Torvalds 已提交
1410
extern void truncate_inode_pages(struct address_space *, loff_t);
1411 1412
extern void truncate_inode_pages_range(struct address_space *,
				       loff_t lstart, loff_t lend);
L
Linus Torvalds 已提交
1413 1414

/* generic vm_area_ops exported for stackable file systems */
N
Nick Piggin 已提交
1415
extern int filemap_fault(struct vm_area_struct *, struct vm_fault *);
L
Linus Torvalds 已提交
1416 1417 1418

/* mm/page-writeback.c */
int write_one_page(struct page *page, int wait);
N
Nick Piggin 已提交
1419
void task_dirty_inc(struct task_struct *tsk);
L
Linus Torvalds 已提交
1420 1421 1422 1423 1424 1425

/* readahead.c */
#define VM_MAX_READAHEAD	128	/* kbytes */
#define VM_MIN_READAHEAD	16	/* kbytes (includes current page) */

int force_page_cache_readahead(struct address_space *mapping, struct file *filp,
A
Andrew Morton 已提交
1426
			pgoff_t offset, unsigned long nr_to_read);
1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440

void page_cache_sync_readahead(struct address_space *mapping,
			       struct file_ra_state *ra,
			       struct file *filp,
			       pgoff_t offset,
			       unsigned long size);

void page_cache_async_readahead(struct address_space *mapping,
				struct file_ra_state *ra,
				struct file *filp,
				struct page *pg,
				pgoff_t offset,
				unsigned long size);

L
Linus Torvalds 已提交
1441
unsigned long max_sane_readahead(unsigned long nr);
1442 1443 1444
unsigned long ra_submit(struct file_ra_state *ra,
			struct address_space *mapping,
			struct file *filp);
L
Linus Torvalds 已提交
1445

1446
/* Generic expand stack which grows the stack according to GROWS{UP,DOWN} */
H
Hugh Dickins 已提交
1447
extern int expand_stack(struct vm_area_struct *vma, unsigned long address);
1448 1449 1450 1451

/* CONFIG_STACK_GROWSUP still needs to to grow downwards at some places */
extern int expand_downwards(struct vm_area_struct *vma,
		unsigned long address);
1452
#if VM_GROWSUP
H
Hugh Dickins 已提交
1453
extern int expand_upwards(struct vm_area_struct *vma, unsigned long address);
1454 1455
#else
  #define expand_upwards(vma, address) do { } while (0)
1456
#endif
L
Linus Torvalds 已提交
1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478

/* Look up the first VMA which satisfies  addr < vm_end,  NULL if none. */
extern struct vm_area_struct * find_vma(struct mm_struct * mm, unsigned long addr);
extern struct vm_area_struct * find_vma_prev(struct mm_struct * mm, unsigned long addr,
					     struct vm_area_struct **pprev);

/* Look up the first VMA which intersects the interval start_addr..end_addr-1,
   NULL if none.  Assume start_addr < end_addr. */
static inline struct vm_area_struct * find_vma_intersection(struct mm_struct * mm, unsigned long start_addr, unsigned long end_addr)
{
	struct vm_area_struct * vma = find_vma(mm,start_addr);

	if (vma && end_addr <= vma->vm_start)
		vma = NULL;
	return vma;
}

static inline unsigned long vma_pages(struct vm_area_struct *vma)
{
	return (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
}

1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490
/* Look up the first VMA which exactly match the interval vm_start ... vm_end */
static inline struct vm_area_struct *find_exact_vma(struct mm_struct *mm,
				unsigned long vm_start, unsigned long vm_end)
{
	struct vm_area_struct *vma = find_vma(mm, vm_start);

	if (vma && (vma->vm_start != vm_start || vma->vm_end != vm_end))
		vma = NULL;

	return vma;
}

1491
#ifdef CONFIG_MMU
1492
pgprot_t vm_get_page_prot(unsigned long vm_flags);
1493 1494 1495 1496 1497 1498 1499
#else
static inline pgprot_t vm_get_page_prot(unsigned long vm_flags)
{
	return __pgprot(0);
}
#endif

1500 1501 1502
struct vm_area_struct *find_extend_vma(struct mm_struct *, unsigned long addr);
int remap_pfn_range(struct vm_area_struct *, unsigned long addr,
			unsigned long pfn, unsigned long size, pgprot_t);
1503
int vm_insert_page(struct vm_area_struct *, unsigned long addr, struct page *);
N
Nick Piggin 已提交
1504 1505
int vm_insert_pfn(struct vm_area_struct *vma, unsigned long addr,
			unsigned long pfn);
N
Nick Piggin 已提交
1506 1507
int vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr,
			unsigned long pfn);
1508

1509
struct page *follow_page(struct vm_area_struct *, unsigned long address,
1510 1511 1512 1513
			unsigned int foll_flags);
#define FOLL_WRITE	0x01	/* check pte is writable */
#define FOLL_TOUCH	0x02	/* mark page accessed */
#define FOLL_GET	0x04	/* do get_page on page */
H
Hugh Dickins 已提交
1514
#define FOLL_DUMP	0x08	/* give error on hole if it would be zero */
H
Hugh Dickins 已提交
1515
#define FOLL_FORCE	0x10	/* get_user_pages read/write w/o permission */
1516 1517
#define FOLL_NOWAIT	0x20	/* if a disk transfer is needed, start the IO
				 * and return without waiting upon it */
1518
#define FOLL_MLOCK	0x40	/* mark page as mlocked */
1519
#define FOLL_SPLIT	0x80	/* don't return transhuge pages, split them */
1520
#define FOLL_HWPOISON	0x100	/* check page is hwpoisoned */
L
Linus Torvalds 已提交
1521

1522
typedef int (*pte_fn_t)(pte_t *pte, pgtable_t token, unsigned long addr,
1523 1524 1525 1526
			void *data);
extern int apply_to_page_range(struct mm_struct *mm, unsigned long address,
			       unsigned long size, pte_fn_t fn, void *data);

L
Linus Torvalds 已提交
1527
#ifdef CONFIG_PROC_FS
1528
void vm_stat_account(struct mm_struct *, unsigned long, struct file *, long);
L
Linus Torvalds 已提交
1529
#else
1530
static inline void vm_stat_account(struct mm_struct *mm,
L
Linus Torvalds 已提交
1531 1532 1533 1534 1535
			unsigned long flags, struct file *file, long pages)
{
}
#endif /* CONFIG_PROC_FS */

1536 1537
#ifdef CONFIG_DEBUG_PAGEALLOC
extern void kernel_map_pages(struct page *page, int numpages, int enable);
1538 1539 1540
#ifdef CONFIG_HIBERNATION
extern bool kernel_page_present(struct page *page);
#endif /* CONFIG_HIBERNATION */
1541
#else
L
Linus Torvalds 已提交
1542
static inline void
N
Nick Piggin 已提交
1543
kernel_map_pages(struct page *page, int numpages, int enable) {}
1544 1545 1546
#ifdef CONFIG_HIBERNATION
static inline bool kernel_page_present(struct page *page) { return true; }
#endif /* CONFIG_HIBERNATION */
L
Linus Torvalds 已提交
1547 1548
#endif

1549
extern struct vm_area_struct *get_gate_vma(struct mm_struct *mm);
L
Linus Torvalds 已提交
1550
#ifdef	__HAVE_ARCH_GATE_AREA
1551
int in_gate_area_no_mm(unsigned long addr);
1552
int in_gate_area(struct mm_struct *mm, unsigned long addr);
L
Linus Torvalds 已提交
1553
#else
1554 1555
int in_gate_area_no_mm(unsigned long addr);
#define in_gate_area(mm, addr) ({(void)mm; in_gate_area_no_mm(addr);})
L
Linus Torvalds 已提交
1556 1557
#endif	/* __HAVE_ARCH_GATE_AREA */

1558
int drop_caches_sysctl_handler(struct ctl_table *, int,
A
Andrew Morton 已提交
1559
					void __user *, size_t *, loff_t *);
1560
unsigned long shrink_slab(struct shrink_control *shrink,
1561 1562
			  unsigned long nr_pages_scanned,
			  unsigned long lru_pages);
A
Andrew Morton 已提交
1563

1564 1565 1566
#ifndef CONFIG_MMU
#define randomize_va_space 0
#else
1567
extern int randomize_va_space;
1568
#endif
1569

1570
const char * arch_vma_name(struct vm_area_struct *vma);
1571
void print_vma_addr(char *prefix, unsigned long rip);
1572

1573 1574 1575 1576 1577 1578
void sparse_mem_maps_populate_node(struct page **map_map,
				   unsigned long pnum_begin,
				   unsigned long pnum_end,
				   unsigned long map_count,
				   int nodeid);

1579
struct page *sparse_mem_map_populate(unsigned long pnum, int nid);
1580 1581 1582 1583
pgd_t *vmemmap_pgd_populate(unsigned long addr, int node);
pud_t *vmemmap_pud_populate(pgd_t *pgd, unsigned long addr, int node);
pmd_t *vmemmap_pmd_populate(pud_t *pud, unsigned long addr, int node);
pte_t *vmemmap_pte_populate(pmd_t *pmd, unsigned long addr, int node);
1584
void *vmemmap_alloc_block(unsigned long size, int node);
1585
void *vmemmap_alloc_block_buf(unsigned long size, int node);
1586
void vmemmap_verify(pte_t *, int, unsigned long, unsigned long);
1587 1588 1589
int vmemmap_populate_basepages(struct page *start_page,
						unsigned long pages, int node);
int vmemmap_populate(struct page *start_page, unsigned long pages, int node);
1590
void vmemmap_populate_print_last(void);
1591

1592

1593 1594
enum mf_flags {
	MF_COUNT_INCREASED = 1 << 0,
1595
	MF_ACTION_REQUIRED = 1 << 1,
1596
};
1597
extern int memory_failure(unsigned long pfn, int trapno, int flags);
1598
extern void memory_failure_queue(unsigned long pfn, int trapno, int flags);
W
Wu Fengguang 已提交
1599
extern int unpoison_memory(unsigned long pfn);
1600 1601
extern int sysctl_memory_failure_early_kill;
extern int sysctl_memory_failure_recovery;
1602
extern void shake_page(struct page *p, int access);
1603
extern atomic_long_t mce_bad_pages;
1604
extern int soft_offline_page(struct page *page, int flags);
1605

1606 1607
extern void dump_page(struct page *page);

A
Andrea Arcangeli 已提交
1608 1609 1610 1611 1612 1613 1614 1615 1616
#if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLBFS)
extern void clear_huge_page(struct page *page,
			    unsigned long addr,
			    unsigned int pages_per_huge_page);
extern void copy_user_huge_page(struct page *dst, struct page *src,
				unsigned long addr, struct vm_area_struct *vma,
				unsigned int pages_per_huge_page);
#endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLBFS */

1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633
#ifdef CONFIG_DEBUG_PAGEALLOC
extern unsigned int _debug_guardpage_minorder;

static inline unsigned int debug_guardpage_minorder(void)
{
	return _debug_guardpage_minorder;
}

static inline bool page_is_guard(struct page *page)
{
	return test_bit(PAGE_DEBUG_FLAG_GUARD, &page->debug_flags);
}
#else
static inline unsigned int debug_guardpage_minorder(void) { return 0; }
static inline bool page_is_guard(struct page *page) { return false; }
#endif /* CONFIG_DEBUG_PAGEALLOC */

L
Linus Torvalds 已提交
1634 1635
#endif /* __KERNEL__ */
#endif /* _LINUX_MM_H */