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1da177e4 LT |
1 | #ifndef _LINUX_MM_H |
2 | #define _LINUX_MM_H | |
3 | ||
1da177e4 LT |
4 | #include <linux/errno.h> |
5 | ||
6 | #ifdef __KERNEL__ | |
7 | ||
1da177e4 LT |
8 | #include <linux/gfp.h> |
9 | #include <linux/list.h> | |
10 | #include <linux/mmzone.h> | |
11 | #include <linux/rbtree.h> | |
12 | #include <linux/prio_tree.h> | |
9a11b49a | 13 | #include <linux/debug_locks.h> |
5b99cd0e | 14 | #include <linux/mm_types.h> |
08677214 | 15 | #include <linux/range.h> |
c6f6b596 | 16 | #include <linux/pfn.h> |
e9da73d6 | 17 | #include <linux/bit_spinlock.h> |
1da177e4 LT |
18 | |
19 | struct mempolicy; | |
20 | struct anon_vma; | |
4e950f6f | 21 | struct file_ra_state; |
e8edc6e0 | 22 | struct user_struct; |
4e950f6f | 23 | struct writeback_control; |
1da177e4 LT |
24 | |
25 | #ifndef CONFIG_DISCONTIGMEM /* Don't use mapnrs, do it properly */ | |
26 | extern unsigned long max_mapnr; | |
27 | #endif | |
28 | ||
29 | extern unsigned long num_physpages; | |
4481374c | 30 | extern unsigned long totalram_pages; |
1da177e4 | 31 | extern void * high_memory; |
1da177e4 LT |
32 | extern int page_cluster; |
33 | ||
34 | #ifdef CONFIG_SYSCTL | |
35 | extern int sysctl_legacy_va_layout; | |
36 | #else | |
37 | #define sysctl_legacy_va_layout 0 | |
38 | #endif | |
39 | ||
40 | #include <asm/page.h> | |
41 | #include <asm/pgtable.h> | |
42 | #include <asm/processor.h> | |
1da177e4 | 43 | |
1da177e4 LT |
44 | #define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n)) |
45 | ||
27ac792c AR |
46 | /* to align the pointer to the (next) page boundary */ |
47 | #define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE) | |
48 | ||
1da177e4 LT |
49 | /* |
50 | * Linux kernel virtual memory manager primitives. | |
51 | * The idea being to have a "virtual" mm in the same way | |
52 | * we have a virtual fs - giving a cleaner interface to the | |
53 | * mm details, and allowing different kinds of memory mappings | |
54 | * (from shared memory to executable loading to arbitrary | |
55 | * mmap() functions). | |
56 | */ | |
57 | ||
c43692e8 CL |
58 | extern struct kmem_cache *vm_area_cachep; |
59 | ||
1da177e4 | 60 | #ifndef CONFIG_MMU |
8feae131 DH |
61 | extern struct rb_root nommu_region_tree; |
62 | extern struct rw_semaphore nommu_region_sem; | |
1da177e4 LT |
63 | |
64 | extern unsigned int kobjsize(const void *objp); | |
65 | #endif | |
66 | ||
67 | /* | |
605d9288 | 68 | * vm_flags in vm_area_struct, see mm_types.h. |
1da177e4 LT |
69 | */ |
70 | #define VM_READ 0x00000001 /* currently active flags */ | |
71 | #define VM_WRITE 0x00000002 | |
72 | #define VM_EXEC 0x00000004 | |
73 | #define VM_SHARED 0x00000008 | |
74 | ||
7e2cff42 | 75 | /* mprotect() hardcodes VM_MAYREAD >> 4 == VM_READ, and so for r/w/x bits. */ |
1da177e4 LT |
76 | #define VM_MAYREAD 0x00000010 /* limits for mprotect() etc */ |
77 | #define VM_MAYWRITE 0x00000020 | |
78 | #define VM_MAYEXEC 0x00000040 | |
79 | #define VM_MAYSHARE 0x00000080 | |
80 | ||
81 | #define VM_GROWSDOWN 0x00000100 /* general info on the segment */ | |
8ca3eb08 | 82 | #if defined(CONFIG_STACK_GROWSUP) || defined(CONFIG_IA64) |
1da177e4 | 83 | #define VM_GROWSUP 0x00000200 |
8ca3eb08 TL |
84 | #else |
85 | #define VM_GROWSUP 0x00000000 | |
86 | #endif | |
6aab341e | 87 | #define VM_PFNMAP 0x00000400 /* Page-ranges managed without "struct page", just pure PFN */ |
1da177e4 LT |
88 | #define VM_DENYWRITE 0x00000800 /* ETXTBSY on write attempts.. */ |
89 | ||
90 | #define VM_EXECUTABLE 0x00001000 | |
91 | #define VM_LOCKED 0x00002000 | |
92 | #define VM_IO 0x00004000 /* Memory mapped I/O or similar */ | |
93 | ||
94 | /* Used by sys_madvise() */ | |
95 | #define VM_SEQ_READ 0x00008000 /* App will access data sequentially */ | |
96 | #define VM_RAND_READ 0x00010000 /* App will not benefit from clustered reads */ | |
97 | ||
98 | #define VM_DONTCOPY 0x00020000 /* Do not copy this vma on fork */ | |
99 | #define VM_DONTEXPAND 0x00040000 /* Cannot expand with mremap() */ | |
0b14c179 | 100 | #define VM_RESERVED 0x00080000 /* Count as reserved_vm like IO */ |
1da177e4 | 101 | #define VM_ACCOUNT 0x00100000 /* Is a VM accounted object */ |
cdfd4325 | 102 | #define VM_NORESERVE 0x00200000 /* should the VM suppress accounting */ |
1da177e4 LT |
103 | #define VM_HUGETLB 0x00400000 /* Huge TLB Page VM */ |
104 | #define VM_NONLINEAR 0x00800000 /* Is non-linear (remap_file_pages) */ | |
105 | #define VM_MAPPED_COPY 0x01000000 /* T if mapped copy of data (nommu mmap) */ | |
895791da | 106 | #define VM_INSERTPAGE 0x02000000 /* The vma has had "vm_insert_page()" done on it */ |
e5b97dde | 107 | #define VM_ALWAYSDUMP 0x04000000 /* Always include in core dumps */ |
d00806b1 | 108 | |
d0217ac0 | 109 | #define VM_CAN_NONLINEAR 0x08000000 /* Has ->fault & does nonlinear pages */ |
b379d790 | 110 | #define VM_MIXEDMAP 0x10000000 /* Can contain "struct page" and pure PFN pages */ |
aba46c50 | 111 | #define VM_SAO 0x20000000 /* Strong Access Ordering (powerpc) */ |
895791da | 112 | #define VM_PFN_AT_MMAP 0x40000000 /* PFNMAP vma that is fully mapped at mmap time */ |
f8af4da3 | 113 | #define VM_MERGEABLE 0x80000000 /* KSM may merge identical pages */ |
1da177e4 | 114 | |
a8bef8ff MG |
115 | /* Bits set in the VMA until the stack is in its final location */ |
116 | #define VM_STACK_INCOMPLETE_SETUP (VM_RAND_READ | VM_SEQ_READ) | |
117 | ||
1da177e4 LT |
118 | #ifndef VM_STACK_DEFAULT_FLAGS /* arch can override this */ |
119 | #define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS | |
120 | #endif | |
121 | ||
122 | #ifdef CONFIG_STACK_GROWSUP | |
123 | #define VM_STACK_FLAGS (VM_GROWSUP | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT) | |
124 | #else | |
125 | #define VM_STACK_FLAGS (VM_GROWSDOWN | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT) | |
126 | #endif | |
127 | ||
128 | #define VM_READHINTMASK (VM_SEQ_READ | VM_RAND_READ) | |
129 | #define VM_ClearReadHint(v) (v)->vm_flags &= ~VM_READHINTMASK | |
130 | #define VM_NormalReadHint(v) (!((v)->vm_flags & VM_READHINTMASK)) | |
131 | #define VM_SequentialReadHint(v) ((v)->vm_flags & VM_SEQ_READ) | |
132 | #define VM_RandomReadHint(v) ((v)->vm_flags & VM_RAND_READ) | |
133 | ||
b291f000 NP |
134 | /* |
135 | * special vmas that are non-mergable, non-mlock()able | |
136 | */ | |
137 | #define VM_SPECIAL (VM_IO | VM_DONTEXPAND | VM_RESERVED | VM_PFNMAP) | |
138 | ||
1da177e4 LT |
139 | /* |
140 | * mapping from the currently active vm_flags protection bits (the | |
141 | * low four bits) to a page protection mask.. | |
142 | */ | |
143 | extern pgprot_t protection_map[16]; | |
144 | ||
d0217ac0 NP |
145 | #define FAULT_FLAG_WRITE 0x01 /* Fault was a write access */ |
146 | #define FAULT_FLAG_NONLINEAR 0x02 /* Fault was via a nonlinear mapping */ | |
c2ec175c | 147 | #define FAULT_FLAG_MKWRITE 0x04 /* Fault was mkwrite of existing pte */ |
d065bd81 | 148 | #define FAULT_FLAG_ALLOW_RETRY 0x08 /* Retry fault if blocking */ |
d0217ac0 | 149 | |
6bd9cd50 | 150 | /* |
151 | * This interface is used by x86 PAT code to identify a pfn mapping that is | |
152 | * linear over entire vma. This is to optimize PAT code that deals with | |
153 | * marking the physical region with a particular prot. This is not for generic | |
154 | * mm use. Note also that this check will not work if the pfn mapping is | |
155 | * linear for a vma starting at physical address 0. In which case PAT code | |
156 | * falls back to slow path of reserving physical range page by page. | |
157 | */ | |
3c8bb73a | 158 | static inline int is_linear_pfn_mapping(struct vm_area_struct *vma) |
159 | { | |
895791da | 160 | return (vma->vm_flags & VM_PFN_AT_MMAP); |
3c8bb73a | 161 | } |
162 | ||
163 | static inline int is_pfn_mapping(struct vm_area_struct *vma) | |
164 | { | |
165 | return (vma->vm_flags & VM_PFNMAP); | |
166 | } | |
d0217ac0 | 167 | |
54cb8821 | 168 | /* |
d0217ac0 | 169 | * vm_fault is filled by the the pagefault handler and passed to the vma's |
83c54070 NP |
170 | * ->fault function. The vma's ->fault is responsible for returning a bitmask |
171 | * of VM_FAULT_xxx flags that give details about how the fault was handled. | |
54cb8821 | 172 | * |
d0217ac0 NP |
173 | * pgoff should be used in favour of virtual_address, if possible. If pgoff |
174 | * is used, one may set VM_CAN_NONLINEAR in the vma->vm_flags to get nonlinear | |
175 | * mapping support. | |
54cb8821 | 176 | */ |
d0217ac0 NP |
177 | struct vm_fault { |
178 | unsigned int flags; /* FAULT_FLAG_xxx flags */ | |
179 | pgoff_t pgoff; /* Logical page offset based on vma */ | |
180 | void __user *virtual_address; /* Faulting virtual address */ | |
181 | ||
182 | struct page *page; /* ->fault handlers should return a | |
83c54070 | 183 | * page here, unless VM_FAULT_NOPAGE |
d0217ac0 | 184 | * is set (which is also implied by |
83c54070 | 185 | * VM_FAULT_ERROR). |
d0217ac0 | 186 | */ |
54cb8821 | 187 | }; |
1da177e4 LT |
188 | |
189 | /* | |
190 | * These are the virtual MM functions - opening of an area, closing and | |
191 | * unmapping it (needed to keep files on disk up-to-date etc), pointer | |
192 | * to the functions called when a no-page or a wp-page exception occurs. | |
193 | */ | |
194 | struct vm_operations_struct { | |
195 | void (*open)(struct vm_area_struct * area); | |
196 | void (*close)(struct vm_area_struct * area); | |
d0217ac0 | 197 | int (*fault)(struct vm_area_struct *vma, struct vm_fault *vmf); |
9637a5ef DH |
198 | |
199 | /* notification that a previously read-only page is about to become | |
200 | * writable, if an error is returned it will cause a SIGBUS */ | |
c2ec175c | 201 | int (*page_mkwrite)(struct vm_area_struct *vma, struct vm_fault *vmf); |
28b2ee20 RR |
202 | |
203 | /* called by access_process_vm when get_user_pages() fails, typically | |
204 | * for use by special VMAs that can switch between memory and hardware | |
205 | */ | |
206 | int (*access)(struct vm_area_struct *vma, unsigned long addr, | |
207 | void *buf, int len, int write); | |
1da177e4 | 208 | #ifdef CONFIG_NUMA |
a6020ed7 LS |
209 | /* |
210 | * set_policy() op must add a reference to any non-NULL @new mempolicy | |
211 | * to hold the policy upon return. Caller should pass NULL @new to | |
212 | * remove a policy and fall back to surrounding context--i.e. do not | |
213 | * install a MPOL_DEFAULT policy, nor the task or system default | |
214 | * mempolicy. | |
215 | */ | |
1da177e4 | 216 | int (*set_policy)(struct vm_area_struct *vma, struct mempolicy *new); |
a6020ed7 LS |
217 | |
218 | /* | |
219 | * get_policy() op must add reference [mpol_get()] to any policy at | |
220 | * (vma,addr) marked as MPOL_SHARED. The shared policy infrastructure | |
221 | * in mm/mempolicy.c will do this automatically. | |
222 | * get_policy() must NOT add a ref if the policy at (vma,addr) is not | |
223 | * marked as MPOL_SHARED. vma policies are protected by the mmap_sem. | |
224 | * If no [shared/vma] mempolicy exists at the addr, get_policy() op | |
225 | * must return NULL--i.e., do not "fallback" to task or system default | |
226 | * policy. | |
227 | */ | |
1da177e4 LT |
228 | struct mempolicy *(*get_policy)(struct vm_area_struct *vma, |
229 | unsigned long addr); | |
7b2259b3 CL |
230 | int (*migrate)(struct vm_area_struct *vma, const nodemask_t *from, |
231 | const nodemask_t *to, unsigned long flags); | |
1da177e4 LT |
232 | #endif |
233 | }; | |
234 | ||
235 | struct mmu_gather; | |
236 | struct inode; | |
237 | ||
349aef0b AM |
238 | #define page_private(page) ((page)->private) |
239 | #define set_page_private(page, v) ((page)->private = (v)) | |
4c21e2f2 | 240 | |
1da177e4 LT |
241 | /* |
242 | * FIXME: take this include out, include page-flags.h in | |
243 | * files which need it (119 of them) | |
244 | */ | |
245 | #include <linux/page-flags.h> | |
246 | ||
247 | /* | |
248 | * Methods to modify the page usage count. | |
249 | * | |
250 | * What counts for a page usage: | |
251 | * - cache mapping (page->mapping) | |
252 | * - private data (page->private) | |
253 | * - page mapped in a task's page tables, each mapping | |
254 | * is counted separately | |
255 | * | |
256 | * Also, many kernel routines increase the page count before a critical | |
257 | * routine so they can be sure the page doesn't go away from under them. | |
1da177e4 LT |
258 | */ |
259 | ||
260 | /* | |
da6052f7 | 261 | * Drop a ref, return true if the refcount fell to zero (the page has no users) |
1da177e4 | 262 | */ |
7c8ee9a8 NP |
263 | static inline int put_page_testzero(struct page *page) |
264 | { | |
725d704e | 265 | VM_BUG_ON(atomic_read(&page->_count) == 0); |
8dc04efb | 266 | return atomic_dec_and_test(&page->_count); |
7c8ee9a8 | 267 | } |
1da177e4 LT |
268 | |
269 | /* | |
7c8ee9a8 NP |
270 | * Try to grab a ref unless the page has a refcount of zero, return false if |
271 | * that is the case. | |
1da177e4 | 272 | */ |
7c8ee9a8 NP |
273 | static inline int get_page_unless_zero(struct page *page) |
274 | { | |
8dc04efb | 275 | return atomic_inc_not_zero(&page->_count); |
7c8ee9a8 | 276 | } |
1da177e4 | 277 | |
53df8fdc WF |
278 | extern int page_is_ram(unsigned long pfn); |
279 | ||
48667e7a | 280 | /* Support for virtually mapped pages */ |
b3bdda02 CL |
281 | struct page *vmalloc_to_page(const void *addr); |
282 | unsigned long vmalloc_to_pfn(const void *addr); | |
48667e7a | 283 | |
0738c4bb PM |
284 | /* |
285 | * Determine if an address is within the vmalloc range | |
286 | * | |
287 | * On nommu, vmalloc/vfree wrap through kmalloc/kfree directly, so there | |
288 | * is no special casing required. | |
289 | */ | |
9e2779fa CL |
290 | static inline int is_vmalloc_addr(const void *x) |
291 | { | |
0738c4bb | 292 | #ifdef CONFIG_MMU |
9e2779fa CL |
293 | unsigned long addr = (unsigned long)x; |
294 | ||
295 | return addr >= VMALLOC_START && addr < VMALLOC_END; | |
0738c4bb PM |
296 | #else |
297 | return 0; | |
8ca3ed87 | 298 | #endif |
0738c4bb | 299 | } |
81ac3ad9 KH |
300 | #ifdef CONFIG_MMU |
301 | extern int is_vmalloc_or_module_addr(const void *x); | |
302 | #else | |
934831d0 | 303 | static inline int is_vmalloc_or_module_addr(const void *x) |
81ac3ad9 KH |
304 | { |
305 | return 0; | |
306 | } | |
307 | #endif | |
9e2779fa | 308 | |
e9da73d6 AA |
309 | static inline void compound_lock(struct page *page) |
310 | { | |
311 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
312 | bit_spin_lock(PG_compound_lock, &page->flags); | |
313 | #endif | |
314 | } | |
315 | ||
316 | static inline void compound_unlock(struct page *page) | |
317 | { | |
318 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
319 | bit_spin_unlock(PG_compound_lock, &page->flags); | |
320 | #endif | |
321 | } | |
322 | ||
323 | static inline unsigned long compound_lock_irqsave(struct page *page) | |
324 | { | |
325 | unsigned long uninitialized_var(flags); | |
326 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
327 | local_irq_save(flags); | |
328 | compound_lock(page); | |
329 | #endif | |
330 | return flags; | |
331 | } | |
332 | ||
333 | static inline void compound_unlock_irqrestore(struct page *page, | |
334 | unsigned long flags) | |
335 | { | |
336 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
337 | compound_unlock(page); | |
338 | local_irq_restore(flags); | |
339 | #endif | |
340 | } | |
341 | ||
d85f3385 CL |
342 | static inline struct page *compound_head(struct page *page) |
343 | { | |
6d777953 | 344 | if (unlikely(PageTail(page))) |
d85f3385 CL |
345 | return page->first_page; |
346 | return page; | |
347 | } | |
348 | ||
4c21e2f2 | 349 | static inline int page_count(struct page *page) |
1da177e4 | 350 | { |
d85f3385 | 351 | return atomic_read(&compound_head(page)->_count); |
1da177e4 LT |
352 | } |
353 | ||
354 | static inline void get_page(struct page *page) | |
355 | { | |
91807063 AA |
356 | /* |
357 | * Getting a normal page or the head of a compound page | |
358 | * requires to already have an elevated page->_count. Only if | |
359 | * we're getting a tail page, the elevated page->_count is | |
360 | * required only in the head page, so for tail pages the | |
361 | * bugcheck only verifies that the page->_count isn't | |
362 | * negative. | |
363 | */ | |
364 | VM_BUG_ON(atomic_read(&page->_count) < !PageTail(page)); | |
1da177e4 | 365 | atomic_inc(&page->_count); |
91807063 AA |
366 | /* |
367 | * Getting a tail page will elevate both the head and tail | |
368 | * page->_count(s). | |
369 | */ | |
370 | if (unlikely(PageTail(page))) { | |
371 | /* | |
372 | * This is safe only because | |
373 | * __split_huge_page_refcount can't run under | |
374 | * get_page(). | |
375 | */ | |
376 | VM_BUG_ON(atomic_read(&page->first_page->_count) <= 0); | |
377 | atomic_inc(&page->first_page->_count); | |
378 | } | |
1da177e4 LT |
379 | } |
380 | ||
b49af68f CL |
381 | static inline struct page *virt_to_head_page(const void *x) |
382 | { | |
383 | struct page *page = virt_to_page(x); | |
384 | return compound_head(page); | |
385 | } | |
386 | ||
7835e98b NP |
387 | /* |
388 | * Setup the page count before being freed into the page allocator for | |
389 | * the first time (boot or memory hotplug) | |
390 | */ | |
391 | static inline void init_page_count(struct page *page) | |
392 | { | |
393 | atomic_set(&page->_count, 1); | |
394 | } | |
395 | ||
1da177e4 | 396 | void put_page(struct page *page); |
1d7ea732 | 397 | void put_pages_list(struct list_head *pages); |
1da177e4 | 398 | |
8dfcc9ba | 399 | void split_page(struct page *page, unsigned int order); |
748446bb | 400 | int split_free_page(struct page *page); |
8dfcc9ba | 401 | |
33f2ef89 AW |
402 | /* |
403 | * Compound pages have a destructor function. Provide a | |
404 | * prototype for that function and accessor functions. | |
405 | * These are _only_ valid on the head of a PG_compound page. | |
406 | */ | |
407 | typedef void compound_page_dtor(struct page *); | |
408 | ||
409 | static inline void set_compound_page_dtor(struct page *page, | |
410 | compound_page_dtor *dtor) | |
411 | { | |
412 | page[1].lru.next = (void *)dtor; | |
413 | } | |
414 | ||
415 | static inline compound_page_dtor *get_compound_page_dtor(struct page *page) | |
416 | { | |
417 | return (compound_page_dtor *)page[1].lru.next; | |
418 | } | |
419 | ||
d85f3385 CL |
420 | static inline int compound_order(struct page *page) |
421 | { | |
6d777953 | 422 | if (!PageHead(page)) |
d85f3385 CL |
423 | return 0; |
424 | return (unsigned long)page[1].lru.prev; | |
425 | } | |
426 | ||
427 | static inline void set_compound_order(struct page *page, unsigned long order) | |
428 | { | |
429 | page[1].lru.prev = (void *)order; | |
430 | } | |
431 | ||
1da177e4 LT |
432 | /* |
433 | * Multiple processes may "see" the same page. E.g. for untouched | |
434 | * mappings of /dev/null, all processes see the same page full of | |
435 | * zeroes, and text pages of executables and shared libraries have | |
436 | * only one copy in memory, at most, normally. | |
437 | * | |
438 | * For the non-reserved pages, page_count(page) denotes a reference count. | |
7e871b6c PBG |
439 | * page_count() == 0 means the page is free. page->lru is then used for |
440 | * freelist management in the buddy allocator. | |
da6052f7 | 441 | * page_count() > 0 means the page has been allocated. |
1da177e4 | 442 | * |
da6052f7 NP |
443 | * Pages are allocated by the slab allocator in order to provide memory |
444 | * to kmalloc and kmem_cache_alloc. In this case, the management of the | |
445 | * page, and the fields in 'struct page' are the responsibility of mm/slab.c | |
446 | * unless a particular usage is carefully commented. (the responsibility of | |
447 | * freeing the kmalloc memory is the caller's, of course). | |
1da177e4 | 448 | * |
da6052f7 NP |
449 | * A page may be used by anyone else who does a __get_free_page(). |
450 | * In this case, page_count still tracks the references, and should only | |
451 | * be used through the normal accessor functions. The top bits of page->flags | |
452 | * and page->virtual store page management information, but all other fields | |
453 | * are unused and could be used privately, carefully. The management of this | |
454 | * page is the responsibility of the one who allocated it, and those who have | |
455 | * subsequently been given references to it. | |
456 | * | |
457 | * The other pages (we may call them "pagecache pages") are completely | |
1da177e4 LT |
458 | * managed by the Linux memory manager: I/O, buffers, swapping etc. |
459 | * The following discussion applies only to them. | |
460 | * | |
da6052f7 NP |
461 | * A pagecache page contains an opaque `private' member, which belongs to the |
462 | * page's address_space. Usually, this is the address of a circular list of | |
463 | * the page's disk buffers. PG_private must be set to tell the VM to call | |
464 | * into the filesystem to release these pages. | |
1da177e4 | 465 | * |
da6052f7 NP |
466 | * A page may belong to an inode's memory mapping. In this case, page->mapping |
467 | * is the pointer to the inode, and page->index is the file offset of the page, | |
468 | * in units of PAGE_CACHE_SIZE. | |
1da177e4 | 469 | * |
da6052f7 NP |
470 | * If pagecache pages are not associated with an inode, they are said to be |
471 | * anonymous pages. These may become associated with the swapcache, and in that | |
472 | * case PG_swapcache is set, and page->private is an offset into the swapcache. | |
1da177e4 | 473 | * |
da6052f7 NP |
474 | * In either case (swapcache or inode backed), the pagecache itself holds one |
475 | * reference to the page. Setting PG_private should also increment the | |
476 | * refcount. The each user mapping also has a reference to the page. | |
1da177e4 | 477 | * |
da6052f7 NP |
478 | * The pagecache pages are stored in a per-mapping radix tree, which is |
479 | * rooted at mapping->page_tree, and indexed by offset. | |
480 | * Where 2.4 and early 2.6 kernels kept dirty/clean pages in per-address_space | |
481 | * lists, we instead now tag pages as dirty/writeback in the radix tree. | |
1da177e4 | 482 | * |
da6052f7 | 483 | * All pagecache pages may be subject to I/O: |
1da177e4 LT |
484 | * - inode pages may need to be read from disk, |
485 | * - inode pages which have been modified and are MAP_SHARED may need | |
da6052f7 NP |
486 | * to be written back to the inode on disk, |
487 | * - anonymous pages (including MAP_PRIVATE file mappings) which have been | |
488 | * modified may need to be swapped out to swap space and (later) to be read | |
489 | * back into memory. | |
1da177e4 LT |
490 | */ |
491 | ||
492 | /* | |
493 | * The zone field is never updated after free_area_init_core() | |
494 | * sets it, so none of the operations on it need to be atomic. | |
1da177e4 | 495 | */ |
348f8b6c | 496 | |
d41dee36 AW |
497 | |
498 | /* | |
499 | * page->flags layout: | |
500 | * | |
501 | * There are three possibilities for how page->flags get | |
502 | * laid out. The first is for the normal case, without | |
503 | * sparsemem. The second is for sparsemem when there is | |
504 | * plenty of space for node and section. The last is when | |
505 | * we have run out of space and have to fall back to an | |
506 | * alternate (slower) way of determining the node. | |
507 | * | |
308c05e3 CL |
508 | * No sparsemem or sparsemem vmemmap: | NODE | ZONE | ... | FLAGS | |
509 | * classic sparse with space for node:| SECTION | NODE | ZONE | ... | FLAGS | | |
510 | * classic sparse no space for node: | SECTION | ZONE | ... | FLAGS | | |
d41dee36 | 511 | */ |
308c05e3 | 512 | #if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP) |
d41dee36 AW |
513 | #define SECTIONS_WIDTH SECTIONS_SHIFT |
514 | #else | |
515 | #define SECTIONS_WIDTH 0 | |
516 | #endif | |
517 | ||
518 | #define ZONES_WIDTH ZONES_SHIFT | |
519 | ||
9223b419 | 520 | #if SECTIONS_WIDTH+ZONES_WIDTH+NODES_SHIFT <= BITS_PER_LONG - NR_PAGEFLAGS |
d41dee36 AW |
521 | #define NODES_WIDTH NODES_SHIFT |
522 | #else | |
308c05e3 CL |
523 | #ifdef CONFIG_SPARSEMEM_VMEMMAP |
524 | #error "Vmemmap: No space for nodes field in page flags" | |
525 | #endif | |
d41dee36 AW |
526 | #define NODES_WIDTH 0 |
527 | #endif | |
528 | ||
529 | /* Page flags: | [SECTION] | [NODE] | ZONE | ... | FLAGS | */ | |
07808b74 | 530 | #define SECTIONS_PGOFF ((sizeof(unsigned long)*8) - SECTIONS_WIDTH) |
d41dee36 AW |
531 | #define NODES_PGOFF (SECTIONS_PGOFF - NODES_WIDTH) |
532 | #define ZONES_PGOFF (NODES_PGOFF - ZONES_WIDTH) | |
533 | ||
534 | /* | |
535 | * We are going to use the flags for the page to node mapping if its in | |
536 | * there. This includes the case where there is no node, so it is implicit. | |
537 | */ | |
89689ae7 CL |
538 | #if !(NODES_WIDTH > 0 || NODES_SHIFT == 0) |
539 | #define NODE_NOT_IN_PAGE_FLAGS | |
540 | #endif | |
d41dee36 AW |
541 | |
542 | #ifndef PFN_SECTION_SHIFT | |
543 | #define PFN_SECTION_SHIFT 0 | |
544 | #endif | |
348f8b6c DH |
545 | |
546 | /* | |
547 | * Define the bit shifts to access each section. For non-existant | |
548 | * sections we define the shift as 0; that plus a 0 mask ensures | |
549 | * the compiler will optimise away reference to them. | |
550 | */ | |
d41dee36 AW |
551 | #define SECTIONS_PGSHIFT (SECTIONS_PGOFF * (SECTIONS_WIDTH != 0)) |
552 | #define NODES_PGSHIFT (NODES_PGOFF * (NODES_WIDTH != 0)) | |
553 | #define ZONES_PGSHIFT (ZONES_PGOFF * (ZONES_WIDTH != 0)) | |
348f8b6c | 554 | |
bce54bbf WD |
555 | /* NODE:ZONE or SECTION:ZONE is used to ID a zone for the buddy allocator */ |
556 | #ifdef NODE_NOT_IN_PAGE_FLAGS | |
89689ae7 | 557 | #define ZONEID_SHIFT (SECTIONS_SHIFT + ZONES_SHIFT) |
bd8029b6 AW |
558 | #define ZONEID_PGOFF ((SECTIONS_PGOFF < ZONES_PGOFF)? \ |
559 | SECTIONS_PGOFF : ZONES_PGOFF) | |
d41dee36 | 560 | #else |
89689ae7 | 561 | #define ZONEID_SHIFT (NODES_SHIFT + ZONES_SHIFT) |
bd8029b6 AW |
562 | #define ZONEID_PGOFF ((NODES_PGOFF < ZONES_PGOFF)? \ |
563 | NODES_PGOFF : ZONES_PGOFF) | |
89689ae7 CL |
564 | #endif |
565 | ||
bd8029b6 | 566 | #define ZONEID_PGSHIFT (ZONEID_PGOFF * (ZONEID_SHIFT != 0)) |
348f8b6c | 567 | |
9223b419 CL |
568 | #if SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS |
569 | #error SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS | |
348f8b6c DH |
570 | #endif |
571 | ||
d41dee36 AW |
572 | #define ZONES_MASK ((1UL << ZONES_WIDTH) - 1) |
573 | #define NODES_MASK ((1UL << NODES_WIDTH) - 1) | |
574 | #define SECTIONS_MASK ((1UL << SECTIONS_WIDTH) - 1) | |
89689ae7 | 575 | #define ZONEID_MASK ((1UL << ZONEID_SHIFT) - 1) |
348f8b6c | 576 | |
2f1b6248 | 577 | static inline enum zone_type page_zonenum(struct page *page) |
1da177e4 | 578 | { |
348f8b6c | 579 | return (page->flags >> ZONES_PGSHIFT) & ZONES_MASK; |
1da177e4 | 580 | } |
1da177e4 | 581 | |
89689ae7 CL |
582 | /* |
583 | * The identification function is only used by the buddy allocator for | |
584 | * determining if two pages could be buddies. We are not really | |
585 | * identifying a zone since we could be using a the section number | |
586 | * id if we have not node id available in page flags. | |
587 | * We guarantee only that it will return the same value for two | |
588 | * combinable pages in a zone. | |
589 | */ | |
cb2b95e1 AW |
590 | static inline int page_zone_id(struct page *page) |
591 | { | |
89689ae7 | 592 | return (page->flags >> ZONEID_PGSHIFT) & ZONEID_MASK; |
348f8b6c DH |
593 | } |
594 | ||
25ba77c1 | 595 | static inline int zone_to_nid(struct zone *zone) |
89fa3024 | 596 | { |
d5f541ed CL |
597 | #ifdef CONFIG_NUMA |
598 | return zone->node; | |
599 | #else | |
600 | return 0; | |
601 | #endif | |
89fa3024 CL |
602 | } |
603 | ||
89689ae7 | 604 | #ifdef NODE_NOT_IN_PAGE_FLAGS |
25ba77c1 | 605 | extern int page_to_nid(struct page *page); |
89689ae7 | 606 | #else |
25ba77c1 | 607 | static inline int page_to_nid(struct page *page) |
d41dee36 | 608 | { |
89689ae7 | 609 | return (page->flags >> NODES_PGSHIFT) & NODES_MASK; |
d41dee36 | 610 | } |
89689ae7 CL |
611 | #endif |
612 | ||
613 | static inline struct zone *page_zone(struct page *page) | |
614 | { | |
615 | return &NODE_DATA(page_to_nid(page))->node_zones[page_zonenum(page)]; | |
616 | } | |
617 | ||
308c05e3 | 618 | #if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP) |
d41dee36 AW |
619 | static inline unsigned long page_to_section(struct page *page) |
620 | { | |
621 | return (page->flags >> SECTIONS_PGSHIFT) & SECTIONS_MASK; | |
622 | } | |
308c05e3 | 623 | #endif |
d41dee36 | 624 | |
2f1b6248 | 625 | static inline void set_page_zone(struct page *page, enum zone_type zone) |
348f8b6c DH |
626 | { |
627 | page->flags &= ~(ZONES_MASK << ZONES_PGSHIFT); | |
628 | page->flags |= (zone & ZONES_MASK) << ZONES_PGSHIFT; | |
629 | } | |
2f1b6248 | 630 | |
348f8b6c DH |
631 | static inline void set_page_node(struct page *page, unsigned long node) |
632 | { | |
633 | page->flags &= ~(NODES_MASK << NODES_PGSHIFT); | |
634 | page->flags |= (node & NODES_MASK) << NODES_PGSHIFT; | |
1da177e4 | 635 | } |
89689ae7 | 636 | |
d41dee36 AW |
637 | static inline void set_page_section(struct page *page, unsigned long section) |
638 | { | |
639 | page->flags &= ~(SECTIONS_MASK << SECTIONS_PGSHIFT); | |
640 | page->flags |= (section & SECTIONS_MASK) << SECTIONS_PGSHIFT; | |
641 | } | |
1da177e4 | 642 | |
2f1b6248 | 643 | static inline void set_page_links(struct page *page, enum zone_type zone, |
d41dee36 | 644 | unsigned long node, unsigned long pfn) |
1da177e4 | 645 | { |
348f8b6c DH |
646 | set_page_zone(page, zone); |
647 | set_page_node(page, node); | |
d41dee36 | 648 | set_page_section(page, pfn_to_section_nr(pfn)); |
1da177e4 LT |
649 | } |
650 | ||
f6ac2354 CL |
651 | /* |
652 | * Some inline functions in vmstat.h depend on page_zone() | |
653 | */ | |
654 | #include <linux/vmstat.h> | |
655 | ||
652050ae | 656 | static __always_inline void *lowmem_page_address(struct page *page) |
1da177e4 | 657 | { |
c6f6b596 | 658 | return __va(PFN_PHYS(page_to_pfn(page))); |
1da177e4 LT |
659 | } |
660 | ||
661 | #if defined(CONFIG_HIGHMEM) && !defined(WANT_PAGE_VIRTUAL) | |
662 | #define HASHED_PAGE_VIRTUAL | |
663 | #endif | |
664 | ||
665 | #if defined(WANT_PAGE_VIRTUAL) | |
666 | #define page_address(page) ((page)->virtual) | |
667 | #define set_page_address(page, address) \ | |
668 | do { \ | |
669 | (page)->virtual = (address); \ | |
670 | } while(0) | |
671 | #define page_address_init() do { } while(0) | |
672 | #endif | |
673 | ||
674 | #if defined(HASHED_PAGE_VIRTUAL) | |
675 | void *page_address(struct page *page); | |
676 | void set_page_address(struct page *page, void *virtual); | |
677 | void page_address_init(void); | |
678 | #endif | |
679 | ||
680 | #if !defined(HASHED_PAGE_VIRTUAL) && !defined(WANT_PAGE_VIRTUAL) | |
681 | #define page_address(page) lowmem_page_address(page) | |
682 | #define set_page_address(page, address) do { } while(0) | |
683 | #define page_address_init() do { } while(0) | |
684 | #endif | |
685 | ||
686 | /* | |
687 | * On an anonymous page mapped into a user virtual memory area, | |
688 | * page->mapping points to its anon_vma, not to a struct address_space; | |
3ca7b3c5 HD |
689 | * with the PAGE_MAPPING_ANON bit set to distinguish it. See rmap.h. |
690 | * | |
691 | * On an anonymous page in a VM_MERGEABLE area, if CONFIG_KSM is enabled, | |
692 | * the PAGE_MAPPING_KSM bit may be set along with the PAGE_MAPPING_ANON bit; | |
693 | * and then page->mapping points, not to an anon_vma, but to a private | |
694 | * structure which KSM associates with that merged page. See ksm.h. | |
695 | * | |
696 | * PAGE_MAPPING_KSM without PAGE_MAPPING_ANON is currently never used. | |
1da177e4 LT |
697 | * |
698 | * Please note that, confusingly, "page_mapping" refers to the inode | |
699 | * address_space which maps the page from disk; whereas "page_mapped" | |
700 | * refers to user virtual address space into which the page is mapped. | |
701 | */ | |
702 | #define PAGE_MAPPING_ANON 1 | |
3ca7b3c5 HD |
703 | #define PAGE_MAPPING_KSM 2 |
704 | #define PAGE_MAPPING_FLAGS (PAGE_MAPPING_ANON | PAGE_MAPPING_KSM) | |
1da177e4 LT |
705 | |
706 | extern struct address_space swapper_space; | |
707 | static inline struct address_space *page_mapping(struct page *page) | |
708 | { | |
709 | struct address_space *mapping = page->mapping; | |
710 | ||
b5fab14e | 711 | VM_BUG_ON(PageSlab(page)); |
1da177e4 LT |
712 | if (unlikely(PageSwapCache(page))) |
713 | mapping = &swapper_space; | |
e20e8779 | 714 | else if ((unsigned long)mapping & PAGE_MAPPING_ANON) |
1da177e4 LT |
715 | mapping = NULL; |
716 | return mapping; | |
717 | } | |
718 | ||
3ca7b3c5 HD |
719 | /* Neutral page->mapping pointer to address_space or anon_vma or other */ |
720 | static inline void *page_rmapping(struct page *page) | |
721 | { | |
722 | return (void *)((unsigned long)page->mapping & ~PAGE_MAPPING_FLAGS); | |
723 | } | |
724 | ||
1da177e4 LT |
725 | static inline int PageAnon(struct page *page) |
726 | { | |
727 | return ((unsigned long)page->mapping & PAGE_MAPPING_ANON) != 0; | |
728 | } | |
729 | ||
730 | /* | |
731 | * Return the pagecache index of the passed page. Regular pagecache pages | |
732 | * use ->index whereas swapcache pages use ->private | |
733 | */ | |
734 | static inline pgoff_t page_index(struct page *page) | |
735 | { | |
736 | if (unlikely(PageSwapCache(page))) | |
4c21e2f2 | 737 | return page_private(page); |
1da177e4 LT |
738 | return page->index; |
739 | } | |
740 | ||
741 | /* | |
742 | * The atomic page->_mapcount, like _count, starts from -1: | |
743 | * so that transitions both from it and to it can be tracked, | |
744 | * using atomic_inc_and_test and atomic_add_negative(-1). | |
745 | */ | |
746 | static inline void reset_page_mapcount(struct page *page) | |
747 | { | |
748 | atomic_set(&(page)->_mapcount, -1); | |
749 | } | |
750 | ||
751 | static inline int page_mapcount(struct page *page) | |
752 | { | |
753 | return atomic_read(&(page)->_mapcount) + 1; | |
754 | } | |
755 | ||
756 | /* | |
757 | * Return true if this page is mapped into pagetables. | |
758 | */ | |
759 | static inline int page_mapped(struct page *page) | |
760 | { | |
761 | return atomic_read(&(page)->_mapcount) >= 0; | |
762 | } | |
763 | ||
1da177e4 LT |
764 | /* |
765 | * Different kinds of faults, as returned by handle_mm_fault(). | |
766 | * Used to decide whether a process gets delivered SIGBUS or | |
767 | * just gets major/minor fault counters bumped up. | |
768 | */ | |
d0217ac0 | 769 | |
83c54070 | 770 | #define VM_FAULT_MINOR 0 /* For backwards compat. Remove me quickly. */ |
d0217ac0 | 771 | |
83c54070 NP |
772 | #define VM_FAULT_OOM 0x0001 |
773 | #define VM_FAULT_SIGBUS 0x0002 | |
774 | #define VM_FAULT_MAJOR 0x0004 | |
775 | #define VM_FAULT_WRITE 0x0008 /* Special case for get_user_pages */ | |
aa50d3a7 AK |
776 | #define VM_FAULT_HWPOISON 0x0010 /* Hit poisoned small page */ |
777 | #define VM_FAULT_HWPOISON_LARGE 0x0020 /* Hit poisoned large page. Index encoded in upper bits */ | |
f33ea7f4 | 778 | |
83c54070 NP |
779 | #define VM_FAULT_NOPAGE 0x0100 /* ->fault installed the pte, not return page */ |
780 | #define VM_FAULT_LOCKED 0x0200 /* ->fault locked the returned page */ | |
d065bd81 | 781 | #define VM_FAULT_RETRY 0x0400 /* ->fault blocked, must retry */ |
1da177e4 | 782 | |
aa50d3a7 AK |
783 | #define VM_FAULT_HWPOISON_LARGE_MASK 0xf000 /* encodes hpage index for large hwpoison */ |
784 | ||
785 | #define VM_FAULT_ERROR (VM_FAULT_OOM | VM_FAULT_SIGBUS | VM_FAULT_HWPOISON | \ | |
786 | VM_FAULT_HWPOISON_LARGE) | |
787 | ||
788 | /* Encode hstate index for a hwpoisoned large page */ | |
789 | #define VM_FAULT_SET_HINDEX(x) ((x) << 12) | |
790 | #define VM_FAULT_GET_HINDEX(x) (((x) >> 12) & 0xf) | |
d0217ac0 | 791 | |
1c0fe6e3 NP |
792 | /* |
793 | * Can be called by the pagefault handler when it gets a VM_FAULT_OOM. | |
794 | */ | |
795 | extern void pagefault_out_of_memory(void); | |
796 | ||
1da177e4 LT |
797 | #define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK) |
798 | ||
799 | extern void show_free_areas(void); | |
800 | ||
3f96b79a | 801 | int shmem_lock(struct file *file, int lock, struct user_struct *user); |
168f5ac6 | 802 | struct file *shmem_file_setup(const char *name, loff_t size, unsigned long flags); |
1da177e4 LT |
803 | int shmem_zero_setup(struct vm_area_struct *); |
804 | ||
b0e15190 DH |
805 | #ifndef CONFIG_MMU |
806 | extern unsigned long shmem_get_unmapped_area(struct file *file, | |
807 | unsigned long addr, | |
808 | unsigned long len, | |
809 | unsigned long pgoff, | |
810 | unsigned long flags); | |
811 | #endif | |
812 | ||
e8edc6e0 | 813 | extern int can_do_mlock(void); |
1da177e4 LT |
814 | extern int user_shm_lock(size_t, struct user_struct *); |
815 | extern void user_shm_unlock(size_t, struct user_struct *); | |
816 | ||
817 | /* | |
818 | * Parameter block passed down to zap_pte_range in exceptional cases. | |
819 | */ | |
820 | struct zap_details { | |
821 | struct vm_area_struct *nonlinear_vma; /* Check page->index if set */ | |
822 | struct address_space *check_mapping; /* Check page->mapping if set */ | |
823 | pgoff_t first_index; /* Lowest page->index to unmap */ | |
824 | pgoff_t last_index; /* Highest page->index to unmap */ | |
825 | spinlock_t *i_mmap_lock; /* For unmap_mapping_range: */ | |
1da177e4 LT |
826 | unsigned long truncate_count; /* Compare vm_truncate_count */ |
827 | }; | |
828 | ||
7e675137 NP |
829 | struct page *vm_normal_page(struct vm_area_struct *vma, unsigned long addr, |
830 | pte_t pte); | |
831 | ||
c627f9cc JS |
832 | int zap_vma_ptes(struct vm_area_struct *vma, unsigned long address, |
833 | unsigned long size); | |
ee39b37b | 834 | unsigned long zap_page_range(struct vm_area_struct *vma, unsigned long address, |
1da177e4 | 835 | unsigned long size, struct zap_details *); |
508034a3 | 836 | unsigned long unmap_vmas(struct mmu_gather **tlb, |
1da177e4 LT |
837 | struct vm_area_struct *start_vma, unsigned long start_addr, |
838 | unsigned long end_addr, unsigned long *nr_accounted, | |
839 | struct zap_details *); | |
e6473092 MM |
840 | |
841 | /** | |
842 | * mm_walk - callbacks for walk_page_range | |
843 | * @pgd_entry: if set, called for each non-empty PGD (top-level) entry | |
844 | * @pud_entry: if set, called for each non-empty PUD (2nd-level) entry | |
845 | * @pmd_entry: if set, called for each non-empty PMD (3rd-level) entry | |
846 | * @pte_entry: if set, called for each non-empty PTE (4th-level) entry | |
847 | * @pte_hole: if set, called for each hole at all levels | |
5dc37642 | 848 | * @hugetlb_entry: if set, called for each hugetlb entry |
e6473092 MM |
849 | * |
850 | * (see walk_page_range for more details) | |
851 | */ | |
852 | struct mm_walk { | |
2165009b DH |
853 | int (*pgd_entry)(pgd_t *, unsigned long, unsigned long, struct mm_walk *); |
854 | int (*pud_entry)(pud_t *, unsigned long, unsigned long, struct mm_walk *); | |
855 | int (*pmd_entry)(pmd_t *, unsigned long, unsigned long, struct mm_walk *); | |
856 | int (*pte_entry)(pte_t *, unsigned long, unsigned long, struct mm_walk *); | |
857 | int (*pte_hole)(unsigned long, unsigned long, struct mm_walk *); | |
116354d1 NH |
858 | int (*hugetlb_entry)(pte_t *, unsigned long, |
859 | unsigned long, unsigned long, struct mm_walk *); | |
2165009b DH |
860 | struct mm_struct *mm; |
861 | void *private; | |
e6473092 MM |
862 | }; |
863 | ||
2165009b DH |
864 | int walk_page_range(unsigned long addr, unsigned long end, |
865 | struct mm_walk *walk); | |
42b77728 | 866 | void free_pgd_range(struct mmu_gather *tlb, unsigned long addr, |
3bf5ee95 | 867 | unsigned long end, unsigned long floor, unsigned long ceiling); |
1da177e4 LT |
868 | int copy_page_range(struct mm_struct *dst, struct mm_struct *src, |
869 | struct vm_area_struct *vma); | |
1da177e4 LT |
870 | void unmap_mapping_range(struct address_space *mapping, |
871 | loff_t const holebegin, loff_t const holelen, int even_cows); | |
3b6748e2 JW |
872 | int follow_pfn(struct vm_area_struct *vma, unsigned long address, |
873 | unsigned long *pfn); | |
d87fe660 | 874 | int follow_phys(struct vm_area_struct *vma, unsigned long address, |
875 | unsigned int flags, unsigned long *prot, resource_size_t *phys); | |
28b2ee20 RR |
876 | int generic_access_phys(struct vm_area_struct *vma, unsigned long addr, |
877 | void *buf, int len, int write); | |
1da177e4 LT |
878 | |
879 | static inline void unmap_shared_mapping_range(struct address_space *mapping, | |
880 | loff_t const holebegin, loff_t const holelen) | |
881 | { | |
882 | unmap_mapping_range(mapping, holebegin, holelen, 0); | |
883 | } | |
884 | ||
25d9e2d1 | 885 | extern void truncate_pagecache(struct inode *inode, loff_t old, loff_t new); |
2c27c65e | 886 | extern void truncate_setsize(struct inode *inode, loff_t newsize); |
25d9e2d1 | 887 | extern int vmtruncate(struct inode *inode, loff_t offset); |
888 | extern int vmtruncate_range(struct inode *inode, loff_t offset, loff_t end); | |
f33ea7f4 | 889 | |
750b4987 | 890 | int truncate_inode_page(struct address_space *mapping, struct page *page); |
25718736 | 891 | int generic_error_remove_page(struct address_space *mapping, struct page *page); |
750b4987 | 892 | |
83f78668 WF |
893 | int invalidate_inode_page(struct page *page); |
894 | ||
7ee1dd3f | 895 | #ifdef CONFIG_MMU |
83c54070 | 896 | extern int handle_mm_fault(struct mm_struct *mm, struct vm_area_struct *vma, |
d06063cc | 897 | unsigned long address, unsigned int flags); |
7ee1dd3f DH |
898 | #else |
899 | static inline int handle_mm_fault(struct mm_struct *mm, | |
900 | struct vm_area_struct *vma, unsigned long address, | |
d06063cc | 901 | unsigned int flags) |
7ee1dd3f DH |
902 | { |
903 | /* should never happen if there's no MMU */ | |
904 | BUG(); | |
905 | return VM_FAULT_SIGBUS; | |
906 | } | |
907 | #endif | |
f33ea7f4 | 908 | |
1da177e4 LT |
909 | extern int make_pages_present(unsigned long addr, unsigned long end); |
910 | extern int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, int len, int write); | |
1da177e4 | 911 | |
d2bf6be8 | 912 | int get_user_pages(struct task_struct *tsk, struct mm_struct *mm, |
9d73777e | 913 | unsigned long start, int nr_pages, int write, int force, |
d2bf6be8 NP |
914 | struct page **pages, struct vm_area_struct **vmas); |
915 | int get_user_pages_fast(unsigned long start, int nr_pages, int write, | |
916 | struct page **pages); | |
f3e8fccd | 917 | struct page *get_dump_page(unsigned long addr); |
1da177e4 | 918 | |
cf9a2ae8 DH |
919 | extern int try_to_release_page(struct page * page, gfp_t gfp_mask); |
920 | extern void do_invalidatepage(struct page *page, unsigned long offset); | |
921 | ||
1da177e4 | 922 | int __set_page_dirty_nobuffers(struct page *page); |
76719325 | 923 | int __set_page_dirty_no_writeback(struct page *page); |
1da177e4 LT |
924 | int redirty_page_for_writepage(struct writeback_control *wbc, |
925 | struct page *page); | |
e3a7cca1 | 926 | void account_page_dirtied(struct page *page, struct address_space *mapping); |
f629d1c9 | 927 | void account_page_writeback(struct page *page); |
b3c97528 | 928 | int set_page_dirty(struct page *page); |
1da177e4 LT |
929 | int set_page_dirty_lock(struct page *page); |
930 | int clear_page_dirty_for_io(struct page *page); | |
931 | ||
39aa3cb3 SB |
932 | /* Is the vma a continuation of the stack vma above it? */ |
933 | static inline int vma_stack_continue(struct vm_area_struct *vma, unsigned long addr) | |
934 | { | |
935 | return vma && (vma->vm_end == addr) && (vma->vm_flags & VM_GROWSDOWN); | |
936 | } | |
937 | ||
b6a2fea3 OW |
938 | extern unsigned long move_page_tables(struct vm_area_struct *vma, |
939 | unsigned long old_addr, struct vm_area_struct *new_vma, | |
940 | unsigned long new_addr, unsigned long len); | |
1da177e4 LT |
941 | extern unsigned long do_mremap(unsigned long addr, |
942 | unsigned long old_len, unsigned long new_len, | |
943 | unsigned long flags, unsigned long new_addr); | |
b6a2fea3 OW |
944 | extern int mprotect_fixup(struct vm_area_struct *vma, |
945 | struct vm_area_struct **pprev, unsigned long start, | |
946 | unsigned long end, unsigned long newflags); | |
1da177e4 | 947 | |
465a454f PZ |
948 | /* |
949 | * doesn't attempt to fault and will return short. | |
950 | */ | |
951 | int __get_user_pages_fast(unsigned long start, int nr_pages, int write, | |
952 | struct page **pages); | |
d559db08 KH |
953 | /* |
954 | * per-process(per-mm_struct) statistics. | |
955 | */ | |
34e55232 | 956 | #if defined(SPLIT_RSS_COUNTING) |
d559db08 KH |
957 | /* |
958 | * The mm counters are not protected by its page_table_lock, | |
959 | * so must be incremented atomically. | |
960 | */ | |
961 | static inline void set_mm_counter(struct mm_struct *mm, int member, long value) | |
962 | { | |
963 | atomic_long_set(&mm->rss_stat.count[member], value); | |
964 | } | |
965 | ||
34e55232 | 966 | unsigned long get_mm_counter(struct mm_struct *mm, int member); |
d559db08 KH |
967 | |
968 | static inline void add_mm_counter(struct mm_struct *mm, int member, long value) | |
969 | { | |
970 | atomic_long_add(value, &mm->rss_stat.count[member]); | |
971 | } | |
972 | ||
973 | static inline void inc_mm_counter(struct mm_struct *mm, int member) | |
974 | { | |
975 | atomic_long_inc(&mm->rss_stat.count[member]); | |
976 | } | |
977 | ||
978 | static inline void dec_mm_counter(struct mm_struct *mm, int member) | |
979 | { | |
980 | atomic_long_dec(&mm->rss_stat.count[member]); | |
981 | } | |
982 | ||
983 | #else /* !USE_SPLIT_PTLOCKS */ | |
984 | /* | |
985 | * The mm counters are protected by its page_table_lock, | |
986 | * so can be incremented directly. | |
987 | */ | |
988 | static inline void set_mm_counter(struct mm_struct *mm, int member, long value) | |
989 | { | |
990 | mm->rss_stat.count[member] = value; | |
991 | } | |
992 | ||
993 | static inline unsigned long get_mm_counter(struct mm_struct *mm, int member) | |
994 | { | |
995 | return mm->rss_stat.count[member]; | |
996 | } | |
997 | ||
998 | static inline void add_mm_counter(struct mm_struct *mm, int member, long value) | |
999 | { | |
1000 | mm->rss_stat.count[member] += value; | |
1001 | } | |
1002 | ||
1003 | static inline void inc_mm_counter(struct mm_struct *mm, int member) | |
1004 | { | |
1005 | mm->rss_stat.count[member]++; | |
1006 | } | |
1007 | ||
1008 | static inline void dec_mm_counter(struct mm_struct *mm, int member) | |
1009 | { | |
1010 | mm->rss_stat.count[member]--; | |
1011 | } | |
1012 | ||
1013 | #endif /* !USE_SPLIT_PTLOCKS */ | |
1014 | ||
1015 | static inline unsigned long get_mm_rss(struct mm_struct *mm) | |
1016 | { | |
1017 | return get_mm_counter(mm, MM_FILEPAGES) + | |
1018 | get_mm_counter(mm, MM_ANONPAGES); | |
1019 | } | |
1020 | ||
1021 | static inline unsigned long get_mm_hiwater_rss(struct mm_struct *mm) | |
1022 | { | |
1023 | return max(mm->hiwater_rss, get_mm_rss(mm)); | |
1024 | } | |
1025 | ||
1026 | static inline unsigned long get_mm_hiwater_vm(struct mm_struct *mm) | |
1027 | { | |
1028 | return max(mm->hiwater_vm, mm->total_vm); | |
1029 | } | |
1030 | ||
1031 | static inline void update_hiwater_rss(struct mm_struct *mm) | |
1032 | { | |
1033 | unsigned long _rss = get_mm_rss(mm); | |
1034 | ||
1035 | if ((mm)->hiwater_rss < _rss) | |
1036 | (mm)->hiwater_rss = _rss; | |
1037 | } | |
1038 | ||
1039 | static inline void update_hiwater_vm(struct mm_struct *mm) | |
1040 | { | |
1041 | if (mm->hiwater_vm < mm->total_vm) | |
1042 | mm->hiwater_vm = mm->total_vm; | |
1043 | } | |
1044 | ||
1045 | static inline void setmax_mm_hiwater_rss(unsigned long *maxrss, | |
1046 | struct mm_struct *mm) | |
1047 | { | |
1048 | unsigned long hiwater_rss = get_mm_hiwater_rss(mm); | |
1049 | ||
1050 | if (*maxrss < hiwater_rss) | |
1051 | *maxrss = hiwater_rss; | |
1052 | } | |
1053 | ||
53bddb4e | 1054 | #if defined(SPLIT_RSS_COUNTING) |
34e55232 | 1055 | void sync_mm_rss(struct task_struct *task, struct mm_struct *mm); |
53bddb4e KH |
1056 | #else |
1057 | static inline void sync_mm_rss(struct task_struct *task, struct mm_struct *mm) | |
1058 | { | |
1059 | } | |
1060 | #endif | |
465a454f | 1061 | |
1da177e4 | 1062 | /* |
8e1f936b | 1063 | * A callback you can register to apply pressure to ageable caches. |
1da177e4 | 1064 | * |
8e1f936b RR |
1065 | * 'shrink' is passed a count 'nr_to_scan' and a 'gfpmask'. It should |
1066 | * look through the least-recently-used 'nr_to_scan' entries and | |
1067 | * attempt to free them up. It should return the number of objects | |
1068 | * which remain in the cache. If it returns -1, it means it cannot do | |
1069 | * any scanning at this time (eg. there is a risk of deadlock). | |
1da177e4 | 1070 | * |
8e1f936b RR |
1071 | * The 'gfpmask' refers to the allocation we are currently trying to |
1072 | * fulfil. | |
1073 | * | |
1074 | * Note that 'shrink' will be passed nr_to_scan == 0 when the VM is | |
1075 | * querying the cache size, so a fastpath for that case is appropriate. | |
1da177e4 | 1076 | */ |
8e1f936b | 1077 | struct shrinker { |
7f8275d0 | 1078 | int (*shrink)(struct shrinker *, int nr_to_scan, gfp_t gfp_mask); |
8e1f936b | 1079 | int seeks; /* seeks to recreate an obj */ |
1da177e4 | 1080 | |
8e1f936b RR |
1081 | /* These are for internal use */ |
1082 | struct list_head list; | |
1083 | long nr; /* objs pending delete */ | |
1084 | }; | |
1085 | #define DEFAULT_SEEKS 2 /* A good number if you don't know better. */ | |
1086 | extern void register_shrinker(struct shrinker *); | |
1087 | extern void unregister_shrinker(struct shrinker *); | |
1da177e4 | 1088 | |
4e950f6f | 1089 | int vma_wants_writenotify(struct vm_area_struct *vma); |
d08b3851 | 1090 | |
25ca1d6c NK |
1091 | extern pte_t *__get_locked_pte(struct mm_struct *mm, unsigned long addr, |
1092 | spinlock_t **ptl); | |
1093 | static inline pte_t *get_locked_pte(struct mm_struct *mm, unsigned long addr, | |
1094 | spinlock_t **ptl) | |
1095 | { | |
1096 | pte_t *ptep; | |
1097 | __cond_lock(*ptl, ptep = __get_locked_pte(mm, addr, ptl)); | |
1098 | return ptep; | |
1099 | } | |
c9cfcddf | 1100 | |
5f22df00 NP |
1101 | #ifdef __PAGETABLE_PUD_FOLDED |
1102 | static inline int __pud_alloc(struct mm_struct *mm, pgd_t *pgd, | |
1103 | unsigned long address) | |
1104 | { | |
1105 | return 0; | |
1106 | } | |
1107 | #else | |
1bb3630e | 1108 | int __pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address); |
5f22df00 NP |
1109 | #endif |
1110 | ||
1111 | #ifdef __PAGETABLE_PMD_FOLDED | |
1112 | static inline int __pmd_alloc(struct mm_struct *mm, pud_t *pud, | |
1113 | unsigned long address) | |
1114 | { | |
1115 | return 0; | |
1116 | } | |
1117 | #else | |
1bb3630e | 1118 | int __pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address); |
5f22df00 NP |
1119 | #endif |
1120 | ||
1bb3630e HD |
1121 | int __pte_alloc(struct mm_struct *mm, pmd_t *pmd, unsigned long address); |
1122 | int __pte_alloc_kernel(pmd_t *pmd, unsigned long address); | |
1123 | ||
1da177e4 LT |
1124 | /* |
1125 | * The following ifdef needed to get the 4level-fixup.h header to work. | |
1126 | * Remove it when 4level-fixup.h has been removed. | |
1127 | */ | |
1bb3630e | 1128 | #if defined(CONFIG_MMU) && !defined(__ARCH_HAS_4LEVEL_HACK) |
1da177e4 LT |
1129 | static inline pud_t *pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address) |
1130 | { | |
1bb3630e HD |
1131 | return (unlikely(pgd_none(*pgd)) && __pud_alloc(mm, pgd, address))? |
1132 | NULL: pud_offset(pgd, address); | |
1da177e4 LT |
1133 | } |
1134 | ||
1135 | static inline pmd_t *pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address) | |
1136 | { | |
1bb3630e HD |
1137 | return (unlikely(pud_none(*pud)) && __pmd_alloc(mm, pud, address))? |
1138 | NULL: pmd_offset(pud, address); | |
1da177e4 | 1139 | } |
1bb3630e HD |
1140 | #endif /* CONFIG_MMU && !__ARCH_HAS_4LEVEL_HACK */ |
1141 | ||
f7d0b926 | 1142 | #if USE_SPLIT_PTLOCKS |
4c21e2f2 HD |
1143 | /* |
1144 | * We tuck a spinlock to guard each pagetable page into its struct page, | |
1145 | * at page->private, with BUILD_BUG_ON to make sure that this will not | |
1146 | * overflow into the next struct page (as it might with DEBUG_SPINLOCK). | |
1147 | * When freeing, reset page->mapping so free_pages_check won't complain. | |
1148 | */ | |
349aef0b | 1149 | #define __pte_lockptr(page) &((page)->ptl) |
4c21e2f2 HD |
1150 | #define pte_lock_init(_page) do { \ |
1151 | spin_lock_init(__pte_lockptr(_page)); \ | |
1152 | } while (0) | |
1153 | #define pte_lock_deinit(page) ((page)->mapping = NULL) | |
1154 | #define pte_lockptr(mm, pmd) ({(void)(mm); __pte_lockptr(pmd_page(*(pmd)));}) | |
f7d0b926 | 1155 | #else /* !USE_SPLIT_PTLOCKS */ |
4c21e2f2 HD |
1156 | /* |
1157 | * We use mm->page_table_lock to guard all pagetable pages of the mm. | |
1158 | */ | |
1159 | #define pte_lock_init(page) do {} while (0) | |
1160 | #define pte_lock_deinit(page) do {} while (0) | |
1161 | #define pte_lockptr(mm, pmd) ({(void)(pmd); &(mm)->page_table_lock;}) | |
f7d0b926 | 1162 | #endif /* USE_SPLIT_PTLOCKS */ |
4c21e2f2 | 1163 | |
2f569afd MS |
1164 | static inline void pgtable_page_ctor(struct page *page) |
1165 | { | |
1166 | pte_lock_init(page); | |
1167 | inc_zone_page_state(page, NR_PAGETABLE); | |
1168 | } | |
1169 | ||
1170 | static inline void pgtable_page_dtor(struct page *page) | |
1171 | { | |
1172 | pte_lock_deinit(page); | |
1173 | dec_zone_page_state(page, NR_PAGETABLE); | |
1174 | } | |
1175 | ||
c74df32c HD |
1176 | #define pte_offset_map_lock(mm, pmd, address, ptlp) \ |
1177 | ({ \ | |
4c21e2f2 | 1178 | spinlock_t *__ptl = pte_lockptr(mm, pmd); \ |
c74df32c HD |
1179 | pte_t *__pte = pte_offset_map(pmd, address); \ |
1180 | *(ptlp) = __ptl; \ | |
1181 | spin_lock(__ptl); \ | |
1182 | __pte; \ | |
1183 | }) | |
1184 | ||
1185 | #define pte_unmap_unlock(pte, ptl) do { \ | |
1186 | spin_unlock(ptl); \ | |
1187 | pte_unmap(pte); \ | |
1188 | } while (0) | |
1189 | ||
1bb3630e HD |
1190 | #define pte_alloc_map(mm, pmd, address) \ |
1191 | ((unlikely(!pmd_present(*(pmd))) && __pte_alloc(mm, pmd, address))? \ | |
1192 | NULL: pte_offset_map(pmd, address)) | |
1193 | ||
c74df32c HD |
1194 | #define pte_alloc_map_lock(mm, pmd, address, ptlp) \ |
1195 | ((unlikely(!pmd_present(*(pmd))) && __pte_alloc(mm, pmd, address))? \ | |
1196 | NULL: pte_offset_map_lock(mm, pmd, address, ptlp)) | |
1197 | ||
1bb3630e HD |
1198 | #define pte_alloc_kernel(pmd, address) \ |
1199 | ((unlikely(!pmd_present(*(pmd))) && __pte_alloc_kernel(pmd, address))? \ | |
1200 | NULL: pte_offset_kernel(pmd, address)) | |
1da177e4 LT |
1201 | |
1202 | extern void free_area_init(unsigned long * zones_size); | |
9109fb7b JW |
1203 | extern void free_area_init_node(int nid, unsigned long * zones_size, |
1204 | unsigned long zone_start_pfn, unsigned long *zholes_size); | |
c713216d MG |
1205 | #ifdef CONFIG_ARCH_POPULATES_NODE_MAP |
1206 | /* | |
1207 | * With CONFIG_ARCH_POPULATES_NODE_MAP set, an architecture may initialise its | |
1208 | * zones, allocate the backing mem_map and account for memory holes in a more | |
1209 | * architecture independent manner. This is a substitute for creating the | |
1210 | * zone_sizes[] and zholes_size[] arrays and passing them to | |
1211 | * free_area_init_node() | |
1212 | * | |
1213 | * An architecture is expected to register range of page frames backed by | |
1214 | * physical memory with add_active_range() before calling | |
1215 | * free_area_init_nodes() passing in the PFN each zone ends at. At a basic | |
1216 | * usage, an architecture is expected to do something like | |
1217 | * | |
1218 | * unsigned long max_zone_pfns[MAX_NR_ZONES] = {max_dma, max_normal_pfn, | |
1219 | * max_highmem_pfn}; | |
1220 | * for_each_valid_physical_page_range() | |
1221 | * add_active_range(node_id, start_pfn, end_pfn) | |
1222 | * free_area_init_nodes(max_zone_pfns); | |
1223 | * | |
1224 | * If the architecture guarantees that there are no holes in the ranges | |
1225 | * registered with add_active_range(), free_bootmem_active_regions() | |
1226 | * will call free_bootmem_node() for each registered physical page range. | |
1227 | * Similarly sparse_memory_present_with_active_regions() calls | |
1228 | * memory_present() for each range when SPARSEMEM is enabled. | |
1229 | * | |
1230 | * See mm/page_alloc.c for more information on each function exposed by | |
1231 | * CONFIG_ARCH_POPULATES_NODE_MAP | |
1232 | */ | |
1233 | extern void free_area_init_nodes(unsigned long *max_zone_pfn); | |
1234 | extern void add_active_range(unsigned int nid, unsigned long start_pfn, | |
1235 | unsigned long end_pfn); | |
cc1050ba YL |
1236 | extern void remove_active_range(unsigned int nid, unsigned long start_pfn, |
1237 | unsigned long end_pfn); | |
c713216d | 1238 | extern void remove_all_active_ranges(void); |
32996250 YL |
1239 | void sort_node_map(void); |
1240 | unsigned long __absent_pages_in_range(int nid, unsigned long start_pfn, | |
1241 | unsigned long end_pfn); | |
c713216d MG |
1242 | extern unsigned long absent_pages_in_range(unsigned long start_pfn, |
1243 | unsigned long end_pfn); | |
1244 | extern void get_pfn_range_for_nid(unsigned int nid, | |
1245 | unsigned long *start_pfn, unsigned long *end_pfn); | |
1246 | extern unsigned long find_min_pfn_with_active_regions(void); | |
c713216d MG |
1247 | extern void free_bootmem_with_active_regions(int nid, |
1248 | unsigned long max_low_pfn); | |
08677214 YL |
1249 | int add_from_early_node_map(struct range *range, int az, |
1250 | int nr_range, int nid); | |
edbe7d23 YL |
1251 | u64 __init find_memory_core_early(int nid, u64 size, u64 align, |
1252 | u64 goal, u64 limit); | |
08677214 YL |
1253 | void *__alloc_memory_core_early(int nodeid, u64 size, u64 align, |
1254 | u64 goal, u64 limit); | |
d52d53b8 | 1255 | typedef int (*work_fn_t)(unsigned long, unsigned long, void *); |
b5bc6c0e | 1256 | extern void work_with_active_regions(int nid, work_fn_t work_fn, void *data); |
c713216d | 1257 | extern void sparse_memory_present_with_active_regions(int nid); |
c713216d | 1258 | #endif /* CONFIG_ARCH_POPULATES_NODE_MAP */ |
f2dbcfa7 KH |
1259 | |
1260 | #if !defined(CONFIG_ARCH_POPULATES_NODE_MAP) && \ | |
1261 | !defined(CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID) | |
1262 | static inline int __early_pfn_to_nid(unsigned long pfn) | |
1263 | { | |
1264 | return 0; | |
1265 | } | |
1266 | #else | |
1267 | /* please see mm/page_alloc.c */ | |
1268 | extern int __meminit early_pfn_to_nid(unsigned long pfn); | |
1269 | #ifdef CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID | |
1270 | /* there is a per-arch backend function. */ | |
1271 | extern int __meminit __early_pfn_to_nid(unsigned long pfn); | |
1272 | #endif /* CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID */ | |
1273 | #endif | |
1274 | ||
0e0b864e | 1275 | extern void set_dma_reserve(unsigned long new_dma_reserve); |
a2f3aa02 DH |
1276 | extern void memmap_init_zone(unsigned long, int, unsigned long, |
1277 | unsigned long, enum memmap_context); | |
bc75d33f | 1278 | extern void setup_per_zone_wmarks(void); |
96cb4df5 | 1279 | extern void calculate_zone_inactive_ratio(struct zone *zone); |
1da177e4 | 1280 | extern void mem_init(void); |
8feae131 | 1281 | extern void __init mmap_init(void); |
1da177e4 LT |
1282 | extern void show_mem(void); |
1283 | extern void si_meminfo(struct sysinfo * val); | |
1284 | extern void si_meminfo_node(struct sysinfo *val, int nid); | |
3461b0af | 1285 | extern int after_bootmem; |
1da177e4 | 1286 | |
e7c8d5c9 | 1287 | extern void setup_per_cpu_pageset(void); |
e7c8d5c9 | 1288 | |
112067f0 SL |
1289 | extern void zone_pcp_update(struct zone *zone); |
1290 | ||
8feae131 | 1291 | /* nommu.c */ |
33e5d769 | 1292 | extern atomic_long_t mmap_pages_allocated; |
7e660872 | 1293 | extern int nommu_shrink_inode_mappings(struct inode *, size_t, size_t); |
8feae131 | 1294 | |
1da177e4 LT |
1295 | /* prio_tree.c */ |
1296 | void vma_prio_tree_add(struct vm_area_struct *, struct vm_area_struct *old); | |
1297 | void vma_prio_tree_insert(struct vm_area_struct *, struct prio_tree_root *); | |
1298 | void vma_prio_tree_remove(struct vm_area_struct *, struct prio_tree_root *); | |
1299 | struct vm_area_struct *vma_prio_tree_next(struct vm_area_struct *vma, | |
1300 | struct prio_tree_iter *iter); | |
1301 | ||
1302 | #define vma_prio_tree_foreach(vma, iter, root, begin, end) \ | |
1303 | for (prio_tree_iter_init(iter, root, begin, end), vma = NULL; \ | |
1304 | (vma = vma_prio_tree_next(vma, iter)); ) | |
1305 | ||
1306 | static inline void vma_nonlinear_insert(struct vm_area_struct *vma, | |
1307 | struct list_head *list) | |
1308 | { | |
1309 | vma->shared.vm_set.parent = NULL; | |
1310 | list_add_tail(&vma->shared.vm_set.list, list); | |
1311 | } | |
1312 | ||
1313 | /* mmap.c */ | |
34b4e4aa | 1314 | extern int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin); |
5beb4930 | 1315 | extern int vma_adjust(struct vm_area_struct *vma, unsigned long start, |
1da177e4 LT |
1316 | unsigned long end, pgoff_t pgoff, struct vm_area_struct *insert); |
1317 | extern struct vm_area_struct *vma_merge(struct mm_struct *, | |
1318 | struct vm_area_struct *prev, unsigned long addr, unsigned long end, | |
1319 | unsigned long vm_flags, struct anon_vma *, struct file *, pgoff_t, | |
1320 | struct mempolicy *); | |
1321 | extern struct anon_vma *find_mergeable_anon_vma(struct vm_area_struct *); | |
1322 | extern int split_vma(struct mm_struct *, | |
1323 | struct vm_area_struct *, unsigned long addr, int new_below); | |
1324 | extern int insert_vm_struct(struct mm_struct *, struct vm_area_struct *); | |
1325 | extern void __vma_link_rb(struct mm_struct *, struct vm_area_struct *, | |
1326 | struct rb_node **, struct rb_node *); | |
a8fb5618 | 1327 | extern void unlink_file_vma(struct vm_area_struct *); |
1da177e4 LT |
1328 | extern struct vm_area_struct *copy_vma(struct vm_area_struct **, |
1329 | unsigned long addr, unsigned long len, pgoff_t pgoff); | |
1330 | extern void exit_mmap(struct mm_struct *); | |
925d1c40 | 1331 | |
7906d00c AA |
1332 | extern int mm_take_all_locks(struct mm_struct *mm); |
1333 | extern void mm_drop_all_locks(struct mm_struct *mm); | |
1334 | ||
925d1c40 MH |
1335 | #ifdef CONFIG_PROC_FS |
1336 | /* From fs/proc/base.c. callers must _not_ hold the mm's exe_file_lock */ | |
1337 | extern void added_exe_file_vma(struct mm_struct *mm); | |
1338 | extern void removed_exe_file_vma(struct mm_struct *mm); | |
1339 | #else | |
1340 | static inline void added_exe_file_vma(struct mm_struct *mm) | |
1341 | {} | |
1342 | ||
1343 | static inline void removed_exe_file_vma(struct mm_struct *mm) | |
1344 | {} | |
1345 | #endif /* CONFIG_PROC_FS */ | |
1346 | ||
119f657c | 1347 | extern int may_expand_vm(struct mm_struct *mm, unsigned long npages); |
fa5dc22f RM |
1348 | extern int install_special_mapping(struct mm_struct *mm, |
1349 | unsigned long addr, unsigned long len, | |
1350 | unsigned long flags, struct page **pages); | |
1da177e4 LT |
1351 | |
1352 | extern unsigned long get_unmapped_area(struct file *, unsigned long, unsigned long, unsigned long, unsigned long); | |
1353 | ||
1354 | extern unsigned long do_mmap_pgoff(struct file *file, unsigned long addr, | |
1355 | unsigned long len, unsigned long prot, | |
1356 | unsigned long flag, unsigned long pgoff); | |
0165ab44 MS |
1357 | extern unsigned long mmap_region(struct file *file, unsigned long addr, |
1358 | unsigned long len, unsigned long flags, | |
5a6fe125 | 1359 | unsigned int vm_flags, unsigned long pgoff); |
1da177e4 LT |
1360 | |
1361 | static inline unsigned long do_mmap(struct file *file, unsigned long addr, | |
1362 | unsigned long len, unsigned long prot, | |
1363 | unsigned long flag, unsigned long offset) | |
1364 | { | |
1365 | unsigned long ret = -EINVAL; | |
1366 | if ((offset + PAGE_ALIGN(len)) < offset) | |
1367 | goto out; | |
1368 | if (!(offset & ~PAGE_MASK)) | |
1369 | ret = do_mmap_pgoff(file, addr, len, prot, flag, offset >> PAGE_SHIFT); | |
1370 | out: | |
1371 | return ret; | |
1372 | } | |
1373 | ||
1374 | extern int do_munmap(struct mm_struct *, unsigned long, size_t); | |
1375 | ||
1376 | extern unsigned long do_brk(unsigned long, unsigned long); | |
1377 | ||
1378 | /* filemap.c */ | |
1379 | extern unsigned long page_unuse(struct page *); | |
1380 | extern void truncate_inode_pages(struct address_space *, loff_t); | |
d7339071 HR |
1381 | extern void truncate_inode_pages_range(struct address_space *, |
1382 | loff_t lstart, loff_t lend); | |
1da177e4 LT |
1383 | |
1384 | /* generic vm_area_ops exported for stackable file systems */ | |
d0217ac0 | 1385 | extern int filemap_fault(struct vm_area_struct *, struct vm_fault *); |
1da177e4 LT |
1386 | |
1387 | /* mm/page-writeback.c */ | |
1388 | int write_one_page(struct page *page, int wait); | |
1cf6e7d8 | 1389 | void task_dirty_inc(struct task_struct *tsk); |
1da177e4 LT |
1390 | |
1391 | /* readahead.c */ | |
1392 | #define VM_MAX_READAHEAD 128 /* kbytes */ | |
1393 | #define VM_MIN_READAHEAD 16 /* kbytes (includes current page) */ | |
1da177e4 | 1394 | |
1da177e4 | 1395 | int force_page_cache_readahead(struct address_space *mapping, struct file *filp, |
7361f4d8 | 1396 | pgoff_t offset, unsigned long nr_to_read); |
cf914a7d RR |
1397 | |
1398 | void page_cache_sync_readahead(struct address_space *mapping, | |
1399 | struct file_ra_state *ra, | |
1400 | struct file *filp, | |
1401 | pgoff_t offset, | |
1402 | unsigned long size); | |
1403 | ||
1404 | void page_cache_async_readahead(struct address_space *mapping, | |
1405 | struct file_ra_state *ra, | |
1406 | struct file *filp, | |
1407 | struct page *pg, | |
1408 | pgoff_t offset, | |
1409 | unsigned long size); | |
1410 | ||
1da177e4 | 1411 | unsigned long max_sane_readahead(unsigned long nr); |
d30a1100 WF |
1412 | unsigned long ra_submit(struct file_ra_state *ra, |
1413 | struct address_space *mapping, | |
1414 | struct file *filp); | |
1da177e4 LT |
1415 | |
1416 | /* Do stack extension */ | |
46dea3d0 | 1417 | extern int expand_stack(struct vm_area_struct *vma, unsigned long address); |
8ca3eb08 | 1418 | #if VM_GROWSUP |
46dea3d0 | 1419 | extern int expand_upwards(struct vm_area_struct *vma, unsigned long address); |
8ca3eb08 TL |
1420 | #else |
1421 | #define expand_upwards(vma, address) do { } while (0) | |
9ab88515 | 1422 | #endif |
b6a2fea3 OW |
1423 | extern int expand_stack_downwards(struct vm_area_struct *vma, |
1424 | unsigned long address); | |
1da177e4 LT |
1425 | |
1426 | /* Look up the first VMA which satisfies addr < vm_end, NULL if none. */ | |
1427 | extern struct vm_area_struct * find_vma(struct mm_struct * mm, unsigned long addr); | |
1428 | extern struct vm_area_struct * find_vma_prev(struct mm_struct * mm, unsigned long addr, | |
1429 | struct vm_area_struct **pprev); | |
1430 | ||
1431 | /* Look up the first VMA which intersects the interval start_addr..end_addr-1, | |
1432 | NULL if none. Assume start_addr < end_addr. */ | |
1433 | static inline struct vm_area_struct * find_vma_intersection(struct mm_struct * mm, unsigned long start_addr, unsigned long end_addr) | |
1434 | { | |
1435 | struct vm_area_struct * vma = find_vma(mm,start_addr); | |
1436 | ||
1437 | if (vma && end_addr <= vma->vm_start) | |
1438 | vma = NULL; | |
1439 | return vma; | |
1440 | } | |
1441 | ||
1442 | static inline unsigned long vma_pages(struct vm_area_struct *vma) | |
1443 | { | |
1444 | return (vma->vm_end - vma->vm_start) >> PAGE_SHIFT; | |
1445 | } | |
1446 | ||
bad849b3 | 1447 | #ifdef CONFIG_MMU |
804af2cf | 1448 | pgprot_t vm_get_page_prot(unsigned long vm_flags); |
bad849b3 DH |
1449 | #else |
1450 | static inline pgprot_t vm_get_page_prot(unsigned long vm_flags) | |
1451 | { | |
1452 | return __pgprot(0); | |
1453 | } | |
1454 | #endif | |
1455 | ||
deceb6cd | 1456 | struct vm_area_struct *find_extend_vma(struct mm_struct *, unsigned long addr); |
deceb6cd HD |
1457 | int remap_pfn_range(struct vm_area_struct *, unsigned long addr, |
1458 | unsigned long pfn, unsigned long size, pgprot_t); | |
a145dd41 | 1459 | int vm_insert_page(struct vm_area_struct *, unsigned long addr, struct page *); |
e0dc0d8f NP |
1460 | int vm_insert_pfn(struct vm_area_struct *vma, unsigned long addr, |
1461 | unsigned long pfn); | |
423bad60 NP |
1462 | int vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr, |
1463 | unsigned long pfn); | |
deceb6cd | 1464 | |
6aab341e | 1465 | struct page *follow_page(struct vm_area_struct *, unsigned long address, |
deceb6cd HD |
1466 | unsigned int foll_flags); |
1467 | #define FOLL_WRITE 0x01 /* check pte is writable */ | |
1468 | #define FOLL_TOUCH 0x02 /* mark page accessed */ | |
1469 | #define FOLL_GET 0x04 /* do get_page on page */ | |
8e4b9a60 | 1470 | #define FOLL_DUMP 0x08 /* give error on hole if it would be zero */ |
58fa879e | 1471 | #define FOLL_FORCE 0x10 /* get_user_pages read/write w/o permission */ |
110d74a9 | 1472 | #define FOLL_MLOCK 0x40 /* mark page as mlocked */ |
1da177e4 | 1473 | |
2f569afd | 1474 | typedef int (*pte_fn_t)(pte_t *pte, pgtable_t token, unsigned long addr, |
aee16b3c JF |
1475 | void *data); |
1476 | extern int apply_to_page_range(struct mm_struct *mm, unsigned long address, | |
1477 | unsigned long size, pte_fn_t fn, void *data); | |
1478 | ||
1da177e4 | 1479 | #ifdef CONFIG_PROC_FS |
ab50b8ed | 1480 | void vm_stat_account(struct mm_struct *, unsigned long, struct file *, long); |
1da177e4 | 1481 | #else |
ab50b8ed | 1482 | static inline void vm_stat_account(struct mm_struct *mm, |
1da177e4 LT |
1483 | unsigned long flags, struct file *file, long pages) |
1484 | { | |
1485 | } | |
1486 | #endif /* CONFIG_PROC_FS */ | |
1487 | ||
12d6f21e IM |
1488 | #ifdef CONFIG_DEBUG_PAGEALLOC |
1489 | extern int debug_pagealloc_enabled; | |
1490 | ||
1491 | extern void kernel_map_pages(struct page *page, int numpages, int enable); | |
1492 | ||
1493 | static inline void enable_debug_pagealloc(void) | |
1494 | { | |
1495 | debug_pagealloc_enabled = 1; | |
1496 | } | |
8a235efa RW |
1497 | #ifdef CONFIG_HIBERNATION |
1498 | extern bool kernel_page_present(struct page *page); | |
1499 | #endif /* CONFIG_HIBERNATION */ | |
12d6f21e | 1500 | #else |
1da177e4 | 1501 | static inline void |
9858db50 | 1502 | kernel_map_pages(struct page *page, int numpages, int enable) {} |
12d6f21e IM |
1503 | static inline void enable_debug_pagealloc(void) |
1504 | { | |
1505 | } | |
8a235efa RW |
1506 | #ifdef CONFIG_HIBERNATION |
1507 | static inline bool kernel_page_present(struct page *page) { return true; } | |
1508 | #endif /* CONFIG_HIBERNATION */ | |
1da177e4 LT |
1509 | #endif |
1510 | ||
1511 | extern struct vm_area_struct *get_gate_vma(struct task_struct *tsk); | |
1512 | #ifdef __HAVE_ARCH_GATE_AREA | |
1513 | int in_gate_area_no_task(unsigned long addr); | |
1514 | int in_gate_area(struct task_struct *task, unsigned long addr); | |
1515 | #else | |
1516 | int in_gate_area_no_task(unsigned long addr); | |
1517 | #define in_gate_area(task, addr) ({(void)task; in_gate_area_no_task(addr);}) | |
1518 | #endif /* __HAVE_ARCH_GATE_AREA */ | |
1519 | ||
8d65af78 | 1520 | int drop_caches_sysctl_handler(struct ctl_table *, int, |
9d0243bc | 1521 | void __user *, size_t *, loff_t *); |
69e05944 | 1522 | unsigned long shrink_slab(unsigned long scanned, gfp_t gfp_mask, |
9d0243bc | 1523 | unsigned long lru_pages); |
9d0243bc | 1524 | |
7a9166e3 LY |
1525 | #ifndef CONFIG_MMU |
1526 | #define randomize_va_space 0 | |
1527 | #else | |
a62eaf15 | 1528 | extern int randomize_va_space; |
7a9166e3 | 1529 | #endif |
a62eaf15 | 1530 | |
045e72ac | 1531 | const char * arch_vma_name(struct vm_area_struct *vma); |
03252919 | 1532 | void print_vma_addr(char *prefix, unsigned long rip); |
e6e5494c | 1533 | |
9bdac914 YL |
1534 | void sparse_mem_maps_populate_node(struct page **map_map, |
1535 | unsigned long pnum_begin, | |
1536 | unsigned long pnum_end, | |
1537 | unsigned long map_count, | |
1538 | int nodeid); | |
1539 | ||
98f3cfc1 | 1540 | struct page *sparse_mem_map_populate(unsigned long pnum, int nid); |
29c71111 AW |
1541 | pgd_t *vmemmap_pgd_populate(unsigned long addr, int node); |
1542 | pud_t *vmemmap_pud_populate(pgd_t *pgd, unsigned long addr, int node); | |
1543 | pmd_t *vmemmap_pmd_populate(pud_t *pud, unsigned long addr, int node); | |
1544 | pte_t *vmemmap_pte_populate(pmd_t *pmd, unsigned long addr, int node); | |
8f6aac41 | 1545 | void *vmemmap_alloc_block(unsigned long size, int node); |
9bdac914 | 1546 | void *vmemmap_alloc_block_buf(unsigned long size, int node); |
8f6aac41 | 1547 | void vmemmap_verify(pte_t *, int, unsigned long, unsigned long); |
29c71111 AW |
1548 | int vmemmap_populate_basepages(struct page *start_page, |
1549 | unsigned long pages, int node); | |
1550 | int vmemmap_populate(struct page *start_page, unsigned long pages, int node); | |
c2b91e2e | 1551 | void vmemmap_populate_print_last(void); |
8f6aac41 | 1552 | |
6a46079c | 1553 | |
82ba011b AK |
1554 | enum mf_flags { |
1555 | MF_COUNT_INCREASED = 1 << 0, | |
1556 | }; | |
6a46079c | 1557 | extern void memory_failure(unsigned long pfn, int trapno); |
82ba011b | 1558 | extern int __memory_failure(unsigned long pfn, int trapno, int flags); |
847ce401 | 1559 | extern int unpoison_memory(unsigned long pfn); |
6a46079c AK |
1560 | extern int sysctl_memory_failure_early_kill; |
1561 | extern int sysctl_memory_failure_recovery; | |
facb6011 | 1562 | extern void shake_page(struct page *p, int access); |
6a46079c | 1563 | extern atomic_long_t mce_bad_pages; |
facb6011 | 1564 | extern int soft_offline_page(struct page *page, int flags); |
bf998156 HY |
1565 | #ifdef CONFIG_MEMORY_FAILURE |
1566 | int is_hwpoison_address(unsigned long addr); | |
1567 | #else | |
1568 | static inline int is_hwpoison_address(unsigned long addr) | |
1569 | { | |
1570 | return 0; | |
1571 | } | |
1572 | #endif | |
6a46079c | 1573 | |
718a3821 WF |
1574 | extern void dump_page(struct page *page); |
1575 | ||
1da177e4 LT |
1576 | #endif /* __KERNEL__ */ |
1577 | #endif /* _LINUX_MM_H */ |