4 #include <linux/sched.h>
5 #include <linux/errno.h>
9 #include <linux/config.h>
10 #include <linux/gfp.h>
11 #include <linux/list.h>
12 #include <linux/mmzone.h>
13 #include <linux/rbtree.h>
14 #include <linux/prio_tree.h>
20 #ifndef CONFIG_DISCONTIGMEM /* Don't use mapnrs, do it properly */
21 extern unsigned long max_mapnr;
24 extern unsigned long num_physpages;
25 extern void * high_memory;
26 extern unsigned long vmalloc_earlyreserve;
27 extern int page_cluster;
29 extern int sysctl_legacy_va_layout;
32 #include <asm/pgtable.h>
33 #include <asm/processor.h>
34 #include <asm/atomic.h>
37 #define MM_VM_SIZE(mm) TASK_SIZE
41 * Linux kernel virtual memory manager primitives.
42 * The idea being to have a "virtual" mm in the same way
43 * we have a virtual fs - giving a cleaner interface to the
44 * mm details, and allowing different kinds of memory mappings
45 * (from shared memory to executable loading to arbitrary
50 * This struct defines a memory VMM memory area. There is one of these
51 * per VM-area/task. A VM area is any part of the process virtual memory
52 * space that has a special rule for the page-fault handlers (ie a shared
53 * library, the executable area etc).
55 struct vm_area_struct {
56 struct mm_struct * vm_mm; /* The address space we belong to. */
57 unsigned long vm_start; /* Our start address within vm_mm. */
58 unsigned long vm_end; /* The first byte after our end address
61 /* linked list of VM areas per task, sorted by address */
62 struct vm_area_struct *vm_next;
64 pgprot_t vm_page_prot; /* Access permissions of this VMA. */
65 unsigned long vm_flags; /* Flags, listed below. */
70 * For areas with an address space and backing store,
71 * linkage into the address_space->i_mmap prio tree, or
72 * linkage to the list of like vmas hanging off its node, or
73 * linkage of vma in the address_space->i_mmap_nonlinear list.
77 struct list_head list;
78 void *parent; /* aligns with prio_tree_node parent */
79 struct vm_area_struct *head;
82 struct prio_tree_node prio_tree_node;
86 * A file's MAP_PRIVATE vma can be in both i_mmap tree and anon_vma
87 * list, after a COW of one of the file pages. A MAP_SHARED vma
88 * can only be in the i_mmap tree. An anonymous MAP_PRIVATE, stack
89 * or brk vma (with NULL file) can only be in an anon_vma list.
91 struct list_head anon_vma_node; /* Serialized by anon_vma->lock */
92 struct anon_vma *anon_vma; /* Serialized by page_table_lock */
94 /* Function pointers to deal with this struct. */
95 struct vm_operations_struct * vm_ops;
97 /* Information about our backing store: */
98 unsigned long vm_pgoff; /* Offset (within vm_file) in PAGE_SIZE
99 units, *not* PAGE_CACHE_SIZE */
100 struct file * vm_file; /* File we map to (can be NULL). */
101 void * vm_private_data; /* was vm_pte (shared mem) */
104 struct mempolicy *vm_policy; /* NUMA policy for the VMA */
111 #define VM_READ 0x00000001 /* currently active flags */
112 #define VM_WRITE 0x00000002
113 #define VM_EXEC 0x00000004
114 #define VM_SHARED 0x00000008
116 #define VM_MAYREAD 0x00000010 /* limits for mprotect() etc */
117 #define VM_MAYWRITE 0x00000020
118 #define VM_MAYEXEC 0x00000040
119 #define VM_MAYSHARE 0x00000080
121 #define VM_GROWSDOWN 0x00000100 /* general info on the segment */
122 #define VM_GROWSUP 0x00000200
123 #define VM_SHM 0x00000400 /* shared memory area, don't swap out */
124 #define VM_DENYWRITE 0x00000800 /* ETXTBSY on write attempts.. */
126 #define VM_EXECUTABLE 0x00001000
127 #define VM_LOCKED 0x00002000
128 #define VM_IO 0x00004000 /* Memory mapped I/O or similar */
130 /* Used by sys_madvise() */
131 #define VM_SEQ_READ 0x00008000 /* App will access data sequentially */
132 #define VM_RAND_READ 0x00010000 /* App will not benefit from clustered reads */
134 #define VM_DONTCOPY 0x00020000 /* Do not copy this vma on fork */
135 #define VM_DONTEXPAND 0x00040000 /* Cannot expand with mremap() */
136 #define VM_RESERVED 0x00080000 /* Don't unmap it from swap_out */
137 #define VM_ACCOUNT 0x00100000 /* Is a VM accounted object */
138 #define VM_HUGETLB 0x00400000 /* Huge TLB Page VM */
139 #define VM_NONLINEAR 0x00800000 /* Is non-linear (remap_file_pages) */
141 #ifndef VM_STACK_DEFAULT_FLAGS /* arch can override this */
142 #define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS
145 #ifdef CONFIG_STACK_GROWSUP
146 #define VM_STACK_FLAGS (VM_GROWSUP | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT)
148 #define VM_STACK_FLAGS (VM_GROWSDOWN | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT)
151 #define VM_READHINTMASK (VM_SEQ_READ | VM_RAND_READ)
152 #define VM_ClearReadHint(v) (v)->vm_flags &= ~VM_READHINTMASK
153 #define VM_NormalReadHint(v) (!((v)->vm_flags & VM_READHINTMASK))
154 #define VM_SequentialReadHint(v) ((v)->vm_flags & VM_SEQ_READ)
155 #define VM_RandomReadHint(v) ((v)->vm_flags & VM_RAND_READ)
158 * mapping from the currently active vm_flags protection bits (the
159 * low four bits) to a page protection mask..
161 extern pgprot_t protection_map[16];
165 * These are the virtual MM functions - opening of an area, closing and
166 * unmapping it (needed to keep files on disk up-to-date etc), pointer
167 * to the functions called when a no-page or a wp-page exception occurs.
169 struct vm_operations_struct {
170 void (*open)(struct vm_area_struct * area);
171 void (*close)(struct vm_area_struct * area);
172 struct page * (*nopage)(struct vm_area_struct * area, unsigned long address, int *type);
173 int (*populate)(struct vm_area_struct * area, unsigned long address, unsigned long len, pgprot_t prot, unsigned long pgoff, int nonblock);
175 int (*set_policy)(struct vm_area_struct *vma, struct mempolicy *new);
176 struct mempolicy *(*get_policy)(struct vm_area_struct *vma,
184 #ifdef ARCH_HAS_ATOMIC_UNSIGNED
185 typedef unsigned page_flags_t;
187 typedef unsigned long page_flags_t;
191 * Each physical page in the system has a struct page associated with
192 * it to keep track of whatever it is we are using the page for at the
193 * moment. Note that we have no way to track which tasks are using
197 page_flags_t flags; /* Atomic flags, some possibly
198 * updated asynchronously */
199 atomic_t _count; /* Usage count, see below. */
200 unsigned int mapcount; /* Count of ptes mapped in mms,
201 * to show when page is mapped
202 * & limit reverse map searches,
203 * protected by PG_maplock.
205 unsigned long private; /* Mapping-private opaque data:
206 * usually used for buffer_heads
207 * if PagePrivate set; used for
208 * swp_entry_t if PageSwapCache
210 struct address_space *mapping; /* If PG_anon clear, points to
211 * inode address_space, or NULL.
212 * If page mapped as anonymous
213 * memory, PG_anon is set, and
214 * it points to anon_vma object.
216 pgoff_t index; /* Our offset within mapping. */
217 struct list_head lru; /* Pageout list, eg. active_list
218 * protected by zone->lru_lock !
221 * On machines where all RAM is mapped into kernel address space,
222 * we can simply calculate the virtual address. On machines with
223 * highmem some memory is mapped into kernel virtual memory
224 * dynamically, so we need a place to store that address.
225 * Note that this field could be 16 bits on x86 ... ;)
227 * Architectures with slow multiplication can define
228 * WANT_PAGE_VIRTUAL in asm/page.h
230 #if defined(WANT_PAGE_VIRTUAL)
231 void *virtual; /* Kernel virtual address (NULL if
232 not kmapped, ie. highmem) */
233 #endif /* WANT_PAGE_VIRTUAL */
234 #ifdef CONFIG_CKRM_RES_MEM
236 #endif // CONFIG_CKRM_RES_MEM
240 * FIXME: take this include out, include page-flags.h in
241 * files which need it (119 of them)
243 #include <linux/page-flags.h>
246 * Methods to modify the page usage count.
248 * What counts for a page usage:
249 * - cache mapping (page->mapping)
250 * - private data (page->private)
251 * - page mapped in a task's page tables, each mapping
252 * is counted separately
254 * Also, many kernel routines increase the page count before a critical
255 * routine so they can be sure the page doesn't go away from under them.
257 * Since 2.6.6 (approx), a free page has ->_count = -1. This is so that we
258 * can use atomic_add_negative(-1, page->_count) to detect when the page
259 * becomes free and so that we can also use atomic_inc_and_test to atomically
260 * detect when we just tried to grab a ref on a page which some other CPU has
261 * already deemed to be freeable.
263 * NO code should make assumptions about this internal detail! Use the provided
264 * macros which retain the old rules: page_count(page) == 0 is a free page.
268 * Drop a ref, return true if the logical refcount fell to zero (the page has
271 #define put_page_testzero(p) \
273 BUG_ON(page_count(p) == 0); \
274 atomic_add_negative(-1, &(p)->_count); \
278 * Grab a ref, return true if the page previously had a logical refcount of
279 * zero. ie: returns true if we just grabbed an already-deemed-to-be-free page
281 #define get_page_testone(p) atomic_inc_and_test(&(p)->_count)
283 #define set_page_count(p,v) atomic_set(&(p)->_count, v - 1)
284 #define __put_page(p) atomic_dec(&(p)->_count)
286 extern void FASTCALL(__page_cache_release(struct page *));
288 #ifdef CONFIG_HUGETLB_PAGE
290 static inline int page_count(struct page *p)
293 p = (struct page *)p->private;
294 return atomic_read(&(p)->_count) + 1;
297 static inline void get_page(struct page *page)
299 if (unlikely(PageCompound(page)))
300 page = (struct page *)page->private;
301 atomic_inc(&page->_count);
304 void put_page(struct page *page);
306 #else /* CONFIG_HUGETLB_PAGE */
308 #define page_count(p) (atomic_read(&(p)->_count) + 1)
310 static inline void get_page(struct page *page)
312 atomic_inc(&page->_count);
315 static inline void put_page(struct page *page)
317 if (!PageReserved(page) && put_page_testzero(page))
318 __page_cache_release(page);
321 #endif /* CONFIG_HUGETLB_PAGE */
324 * Multiple processes may "see" the same page. E.g. for untouched
325 * mappings of /dev/null, all processes see the same page full of
326 * zeroes, and text pages of executables and shared libraries have
327 * only one copy in memory, at most, normally.
329 * For the non-reserved pages, page_count(page) denotes a reference count.
330 * page_count() == 0 means the page is free.
331 * page_count() == 1 means the page is used for exactly one purpose
332 * (e.g. a private data page of one process).
334 * A page may be used for kmalloc() or anyone else who does a
335 * __get_free_page(). In this case the page_count() is at least 1, and
336 * all other fields are unused but should be 0 or NULL. The
337 * management of this page is the responsibility of the one who uses
340 * The other pages (we may call them "process pages") are completely
341 * managed by the Linux memory manager: I/O, buffers, swapping etc.
342 * The following discussion applies only to them.
344 * A page may belong to an inode's memory mapping. In this case,
345 * page->mapping is the pointer to the inode, and page->index is the
346 * file offset of the page, in units of PAGE_CACHE_SIZE.
348 * A page contains an opaque `private' member, which belongs to the
349 * page's address_space. Usually, this is the address of a circular
350 * list of the page's disk buffers.
352 * For pages belonging to inodes, the page_count() is the number of
353 * attaches, plus 1 if `private' contains something, plus one for
354 * the page cache itself.
356 * All pages belonging to an inode are in these doubly linked lists:
357 * mapping->clean_pages, mapping->dirty_pages and mapping->locked_pages;
358 * using the page->list list_head. These fields are also used for
359 * freelist managemet (when page_count()==0).
361 * There is also a per-mapping radix tree mapping index to the page
362 * in memory if present. The tree is rooted at mapping->root.
364 * All process pages can do I/O:
365 * - inode pages may need to be read from disk,
366 * - inode pages which have been modified and are MAP_SHARED may need
367 * to be written to disk,
368 * - private pages which have been modified may need to be swapped out
369 * to swap space and (later) to be read back into memory.
373 * The zone field is never updated after free_area_init_core()
374 * sets it, so none of the operations on it need to be atomic.
375 * We'll have up to (MAX_NUMNODES * MAX_NR_ZONES) zones total,
376 * so we use (MAX_NODES_SHIFT + MAX_ZONES_SHIFT) here to get enough bits.
378 #define NODEZONE_SHIFT (sizeof(page_flags_t)*8 - MAX_NODES_SHIFT - MAX_ZONES_SHIFT)
379 #define NODEZONE(node, zone) ((node << ZONES_SHIFT) | zone)
381 static inline unsigned long page_zonenum(struct page *page)
383 return (page->flags >> NODEZONE_SHIFT) & (~(~0UL << ZONES_SHIFT));
385 static inline unsigned long page_to_nid(struct page *page)
387 return (page->flags >> (NODEZONE_SHIFT + ZONES_SHIFT));
391 extern struct zone *zone_table[];
393 static inline struct zone *page_zone(struct page *page)
395 return zone_table[page->flags >> NODEZONE_SHIFT];
398 static inline void set_page_zone(struct page *page, unsigned long nodezone_num)
400 page->flags &= ~(~0UL << NODEZONE_SHIFT);
401 page->flags |= nodezone_num << NODEZONE_SHIFT;
404 #ifndef CONFIG_DISCONTIGMEM
405 /* The array of struct pages - for discontigmem use pgdat->lmem_map */
406 extern struct page *mem_map;
409 static inline void *lowmem_page_address(struct page *page)
411 return __va(page_to_pfn(page) << PAGE_SHIFT);
414 #if defined(CONFIG_HIGHMEM) && !defined(WANT_PAGE_VIRTUAL)
415 #define HASHED_PAGE_VIRTUAL
418 #if defined(WANT_PAGE_VIRTUAL)
419 #define page_address(page) ((page)->virtual)
420 #define set_page_address(page, address) \
422 (page)->virtual = (address); \
424 #define page_address_init() do { } while(0)
427 #if defined(HASHED_PAGE_VIRTUAL)
428 void *page_address(struct page *page);
429 void set_page_address(struct page *page, void *virtual);
430 void page_address_init(void);
433 #if !defined(HASHED_PAGE_VIRTUAL) && !defined(WANT_PAGE_VIRTUAL)
434 #define page_address(page) lowmem_page_address(page)
435 #define set_page_address(page, address) do { } while(0)
436 #define page_address_init() do { } while(0)
440 * On an anonymous page mapped into a user virtual memory area,
441 * page->mapping points to its anon_vma, not to a struct address_space.
443 * Please note that, confusingly, "page_mapping" refers to the inode
444 * address_space which maps the page from disk; whereas "page_mapped"
445 * refers to user virtual address space into which the page is mapped.
447 extern struct address_space swapper_space;
448 static inline struct address_space *page_mapping(struct page *page)
450 struct address_space *mapping = NULL;
452 if (unlikely(PageSwapCache(page)))
453 mapping = &swapper_space;
454 else if (likely(!PageAnon(page)))
455 mapping = page->mapping;
460 * Return the pagecache index of the passed page. Regular pagecache pages
461 * use ->index whereas swapcache pages use ->private
463 static inline pgoff_t page_index(struct page *page)
465 if (unlikely(PageSwapCache(page)))
466 return page->private;
471 * Return true if this page is mapped into pagetables.
473 static inline int page_mapped(struct page *page)
475 return page->mapcount != 0;
479 * Error return values for the *_nopage functions
481 #define NOPAGE_SIGBUS (NULL)
482 #define NOPAGE_OOM ((struct page *) (-1))
485 * Different kinds of faults, as returned by handle_mm_fault().
486 * Used to decide whether a process gets delivered SIGBUS or
487 * just gets major/minor fault counters bumped up.
489 #define VM_FAULT_OOM (-1)
490 #define VM_FAULT_SIGBUS 0
491 #define VM_FAULT_MINOR 1
492 #define VM_FAULT_MAJOR 2
494 #define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK)
496 extern void show_free_areas(void);
498 struct page *shmem_nopage(struct vm_area_struct * vma,
499 unsigned long address, int *type);
500 int shmem_set_policy(struct vm_area_struct *vma, struct mempolicy *new);
501 struct mempolicy *shmem_get_policy(struct vm_area_struct *vma,
503 struct file *shmem_file_setup(char * name, loff_t size, unsigned long flags);
504 int shmem_lock(struct file *file, int lock, struct user_struct *user);
505 int shmem_zero_setup(struct vm_area_struct *);
507 static inline int can_do_mlock(void)
509 if (capable(CAP_IPC_LOCK))
511 if (current->rlim[RLIMIT_MEMLOCK].rlim_cur != 0)
515 extern int user_shm_lock(size_t, struct user_struct *);
516 extern void user_shm_unlock(size_t, struct user_struct *);
519 * Parameter block passed down to zap_pte_range in exceptional cases.
522 struct vm_area_struct *nonlinear_vma; /* Check page->index if set */
523 struct address_space *check_mapping; /* Check page->mapping if set */
524 pgoff_t first_index; /* Lowest page->index to unmap */
525 pgoff_t last_index; /* Highest page->index to unmap */
526 int atomic; /* May not schedule() */
529 void zap_page_range(struct vm_area_struct *vma, unsigned long address,
530 unsigned long size, struct zap_details *);
531 int unmap_vmas(struct mmu_gather **tlbp, struct mm_struct *mm,
532 struct vm_area_struct *start_vma, unsigned long start_addr,
533 unsigned long end_addr, unsigned long *nr_accounted,
534 struct zap_details *);
535 void clear_page_tables(struct mmu_gather *tlb, unsigned long first, int nr);
536 int copy_page_range(struct mm_struct *dst, struct mm_struct *src,
537 struct vm_area_struct *vma);
538 int zeromap_page_range(struct vm_area_struct *vma, unsigned long from,
539 unsigned long size, pgprot_t prot);
540 void unmap_mapping_range(struct address_space *mapping,
541 loff_t const holebegin, loff_t const holelen, int even_cows);
543 static inline void unmap_shared_mapping_range(struct address_space *mapping,
544 loff_t const holebegin, loff_t const holelen)
546 unmap_mapping_range(mapping, holebegin, holelen, 0);
549 extern int vmtruncate(struct inode * inode, loff_t offset);
550 extern pmd_t *FASTCALL(__pmd_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address));
551 extern pte_t *FASTCALL(pte_alloc_kernel(struct mm_struct *mm, pmd_t *pmd, unsigned long address));
552 extern pte_t *FASTCALL(pte_alloc_map(struct mm_struct *mm, pmd_t *pmd, unsigned long address));
553 extern int install_page(struct mm_struct *mm, struct vm_area_struct *vma, unsigned long addr, struct page *page, pgprot_t prot);
554 extern int install_file_pte(struct mm_struct *mm, struct vm_area_struct *vma, unsigned long addr, unsigned long pgoff, pgprot_t prot);
555 extern int handle_mm_fault(struct mm_struct *mm,struct vm_area_struct *vma, unsigned long address, int write_access);
556 extern int make_pages_present(unsigned long addr, unsigned long end);
557 extern int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, int len, int write);
558 void install_arg_page(struct vm_area_struct *, struct page *, unsigned long);
560 int get_user_pages(struct task_struct *tsk, struct mm_struct *mm, unsigned long start,
561 int len, int write, int force, struct page **pages, struct vm_area_struct **vmas);
563 int __set_page_dirty_buffers(struct page *page);
564 int __set_page_dirty_nobuffers(struct page *page);
565 int redirty_page_for_writepage(struct writeback_control *wbc,
567 int FASTCALL(set_page_dirty(struct page *page));
568 int set_page_dirty_lock(struct page *page);
569 int clear_page_dirty_for_io(struct page *page);
572 * Prototype to add a shrinker callback for ageable caches.
574 * These functions are passed a count `nr_to_scan' and a gfpmask. They should
575 * scan `nr_to_scan' objects, attempting to free them.
577 * The callback must the number of objects which remain in the cache.
579 * The callback will be passes nr_to_scan == 0 when the VM is querying the
580 * cache size, so a fastpath for that case is appropriate.
582 typedef int (*shrinker_t)(int nr_to_scan, unsigned int gfp_mask);
584 extern long do_mprotect(struct mm_struct *mm, unsigned long start,
585 size_t len, unsigned long prot);
588 * Add an aging callback. The int is the number of 'seeks' it takes
589 * to recreate one of the objects that these functions age.
592 #define DEFAULT_SEEKS 2
594 extern struct shrinker *set_shrinker(int, shrinker_t);
595 extern void remove_shrinker(struct shrinker *shrinker);
598 * On a two-level page table, this ends up being trivial. Thus the
599 * inlining and the symmetry break with pte_alloc_map() that does all
600 * of this out-of-line.
602 static inline pmd_t *pmd_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address)
605 return __pmd_alloc(mm, pgd, address);
606 return pmd_offset(pgd, address);
609 extern void free_area_init(unsigned long * zones_size);
610 extern void free_area_init_node(int nid, pg_data_t *pgdat, struct page *pmap,
611 unsigned long * zones_size, unsigned long zone_start_pfn,
612 unsigned long *zholes_size);
613 extern void memmap_init_zone(struct page *, unsigned long, int,
614 unsigned long, unsigned long);
615 extern void mem_init(void);
616 extern void show_mem(void);
617 extern void si_meminfo(struct sysinfo * val);
618 extern void si_meminfo_node(struct sysinfo *val, int nid);
620 static inline void vma_prio_tree_init(struct vm_area_struct *vma)
622 vma->shared.vm_set.list.next = NULL;
623 vma->shared.vm_set.list.prev = NULL;
624 vma->shared.vm_set.parent = NULL;
625 vma->shared.vm_set.head = NULL;
629 void vma_prio_tree_add(struct vm_area_struct *, struct vm_area_struct *old);
630 void vma_prio_tree_insert(struct vm_area_struct *, struct prio_tree_root *);
631 void vma_prio_tree_remove(struct vm_area_struct *, struct prio_tree_root *);
632 struct vm_area_struct *vma_prio_tree_next(
633 struct vm_area_struct *, struct prio_tree_root *,
634 struct prio_tree_iter *, pgoff_t begin, pgoff_t end);
637 extern void vma_adjust(struct vm_area_struct *vma, unsigned long start,
638 unsigned long end, pgoff_t pgoff, struct vm_area_struct *insert);
639 extern struct vm_area_struct *vma_merge(struct mm_struct *,
640 struct vm_area_struct *prev, unsigned long addr, unsigned long end,
641 unsigned long vm_flags, struct anon_vma *, struct file *, pgoff_t,
643 extern struct anon_vma *find_mergeable_anon_vma(struct vm_area_struct *);
644 extern int split_vma(struct mm_struct *,
645 struct vm_area_struct *, unsigned long addr, int new_below);
646 extern void insert_vm_struct(struct mm_struct *, struct vm_area_struct *);
647 extern void __vma_link_rb(struct mm_struct *, struct vm_area_struct *,
648 struct rb_node **, struct rb_node *);
649 extern struct vm_area_struct *copy_vma(struct vm_area_struct **,
650 unsigned long addr, unsigned long len, pgoff_t pgoff);
651 extern void exit_mmap(struct mm_struct *);
653 extern unsigned long get_unmapped_area_prot(struct file *, unsigned long, unsigned long, unsigned long, unsigned long, int);
656 static inline unsigned long get_unmapped_area(struct file * file, unsigned long addr,
657 unsigned long len, unsigned long pgoff, unsigned long flags)
659 return get_unmapped_area_prot(file, addr, len, pgoff, flags, 0);
662 extern unsigned long do_mmap_pgoff(struct mm_struct *mm, struct file *file,
663 unsigned long addr, unsigned long len,
664 unsigned long prot, unsigned long flag,
665 unsigned long pgoff);
667 static inline unsigned long do_mmap(struct file *file, unsigned long addr,
668 unsigned long len, unsigned long prot,
669 unsigned long flag, unsigned long offset)
671 unsigned long ret = -EINVAL;
672 if ((offset + PAGE_ALIGN(len)) < offset)
674 if (!(offset & ~PAGE_MASK))
675 ret = do_mmap_pgoff(current->mm, file, addr, len, prot, flag,
676 offset >> PAGE_SHIFT);
681 extern int do_munmap(struct mm_struct *, unsigned long, size_t);
683 extern unsigned long do_brk(unsigned long, unsigned long);
686 extern unsigned long page_unuse(struct page *);
687 extern void truncate_inode_pages(struct address_space *, loff_t);
689 /* generic vm_area_ops exported for stackable file systems */
690 struct page *filemap_nopage(struct vm_area_struct *, unsigned long, int *);
692 /* mm/page-writeback.c */
693 int write_one_page(struct page *page, int wait);
696 #define VM_MAX_READAHEAD 128 /* kbytes */
697 #define VM_MIN_READAHEAD 16 /* kbytes (includes current page) */
699 int do_page_cache_readahead(struct address_space *mapping, struct file *filp,
700 unsigned long offset, unsigned long nr_to_read);
701 int force_page_cache_readahead(struct address_space *mapping, struct file *filp,
702 unsigned long offset, unsigned long nr_to_read);
703 void page_cache_readahead(struct address_space *mapping,
704 struct file_ra_state *ra,
706 unsigned long offset);
707 void handle_ra_miss(struct address_space *mapping,
708 struct file_ra_state *ra, pgoff_t offset);
709 unsigned long max_sane_readahead(unsigned long nr);
711 /* Do stack extension */
712 extern int expand_stack(struct vm_area_struct * vma, unsigned long address);
714 /* Look up the first VMA which satisfies addr < vm_end, NULL if none. */
715 extern struct vm_area_struct * find_vma(struct mm_struct * mm, unsigned long addr);
716 extern struct vm_area_struct * find_vma_prev(struct mm_struct * mm, unsigned long addr,
717 struct vm_area_struct **pprev);
719 /* Look up the first VMA which intersects the interval start_addr..end_addr-1,
720 NULL if none. Assume start_addr < end_addr. */
721 static inline struct vm_area_struct * find_vma_intersection(struct mm_struct * mm, unsigned long start_addr, unsigned long end_addr)
723 struct vm_area_struct * vma = find_vma(mm,start_addr);
725 if (vma && end_addr <= vma->vm_start)
730 static inline unsigned long vma_pages(struct vm_area_struct *vma)
732 return (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
735 extern struct vm_area_struct *find_extend_vma(struct mm_struct *mm, unsigned long addr);
737 extern struct page * vmalloc_to_page(void *addr);
738 extern struct page * follow_page(struct mm_struct *mm, unsigned long address,
740 extern struct page * follow_page_pfn(struct mm_struct *mm,
741 unsigned long address, int write, unsigned long *pfn);
742 extern int remap_page_range(struct vm_area_struct *vma, unsigned long from,
743 unsigned long to, unsigned long size, pgprot_t prot);
745 #ifndef CONFIG_DEBUG_PAGEALLOC
747 kernel_map_pages(struct page *page, int numpages, int enable)
752 #ifndef CONFIG_ARCH_GATE_AREA
753 extern struct vm_area_struct *get_gate_vma(struct task_struct *tsk);
754 int in_gate_area(struct task_struct *task, unsigned long addr);
757 #endif /* __KERNEL__ */
758 #endif /* _LINUX_MM_H */