Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | #ifndef _LINUX_MM_H |
| 2 | #define _LINUX_MM_H |
| 3 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | #include <linux/errno.h> |
| 5 | |
| 6 | #ifdef __KERNEL__ |
| 7 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Ingo Molnar | 9a11b49a | 2006-07-03 00:24:33 -0700 | [diff] [blame] | 13 | #include <linux/debug_locks.h> |
Heiko Carstens | 5b99cd0 | 2006-09-27 01:50:01 -0700 | [diff] [blame] | 14 | #include <linux/mm_types.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | |
| 16 | struct mempolicy; |
| 17 | struct anon_vma; |
Alexey Dobriyan | 4e950f6 | 2007-07-30 02:36:13 +0400 | [diff] [blame] | 18 | struct file_ra_state; |
Alexey Dobriyan | e8edc6e | 2007-05-21 01:22:52 +0400 | [diff] [blame] | 19 | struct user_struct; |
Alexey Dobriyan | 4e950f6 | 2007-07-30 02:36:13 +0400 | [diff] [blame] | 20 | struct writeback_control; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | |
| 22 | #ifndef CONFIG_DISCONTIGMEM /* Don't use mapnrs, do it properly */ |
| 23 | extern unsigned long max_mapnr; |
| 24 | #endif |
| 25 | |
| 26 | extern unsigned long num_physpages; |
| 27 | extern void * high_memory; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | extern int page_cluster; |
| 29 | |
| 30 | #ifdef CONFIG_SYSCTL |
| 31 | extern int sysctl_legacy_va_layout; |
| 32 | #else |
| 33 | #define sysctl_legacy_va_layout 0 |
| 34 | #endif |
| 35 | |
James Morris | 42d7896 | 2007-12-26 15:12:37 +1100 | [diff] [blame] | 36 | extern unsigned long mmap_min_addr; |
| 37 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | #include <asm/page.h> |
| 39 | #include <asm/pgtable.h> |
| 40 | #include <asm/processor.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | #define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n)) |
| 43 | |
| 44 | /* |
| 45 | * Linux kernel virtual memory manager primitives. |
| 46 | * The idea being to have a "virtual" mm in the same way |
| 47 | * we have a virtual fs - giving a cleaner interface to the |
| 48 | * mm details, and allowing different kinds of memory mappings |
| 49 | * (from shared memory to executable loading to arbitrary |
| 50 | * mmap() functions). |
| 51 | */ |
| 52 | |
Christoph Lameter | c43692e | 2006-12-06 20:32:48 -0800 | [diff] [blame] | 53 | extern struct kmem_cache *vm_area_cachep; |
| 54 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | /* |
| 56 | * This struct defines the per-mm list of VMAs for uClinux. If CONFIG_MMU is |
| 57 | * disabled, then there's a single shared list of VMAs maintained by the |
| 58 | * system, and mm's subscribe to these individually |
| 59 | */ |
| 60 | struct vm_list_struct { |
| 61 | struct vm_list_struct *next; |
| 62 | struct vm_area_struct *vma; |
| 63 | }; |
| 64 | |
| 65 | #ifndef CONFIG_MMU |
| 66 | extern struct rb_root nommu_vma_tree; |
| 67 | extern struct rw_semaphore nommu_vma_sem; |
| 68 | |
| 69 | extern unsigned int kobjsize(const void *objp); |
| 70 | #endif |
| 71 | |
| 72 | /* |
| 73 | * vm_flags.. |
| 74 | */ |
| 75 | #define VM_READ 0x00000001 /* currently active flags */ |
| 76 | #define VM_WRITE 0x00000002 |
| 77 | #define VM_EXEC 0x00000004 |
| 78 | #define VM_SHARED 0x00000008 |
| 79 | |
Paolo 'Blaisorblade' Giarrusso | 7e2cff4 | 2005-09-21 09:55:39 -0700 | [diff] [blame] | 80 | /* mprotect() hardcodes VM_MAYREAD >> 4 == VM_READ, and so for r/w/x bits. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | #define VM_MAYREAD 0x00000010 /* limits for mprotect() etc */ |
| 82 | #define VM_MAYWRITE 0x00000020 |
| 83 | #define VM_MAYEXEC 0x00000040 |
| 84 | #define VM_MAYSHARE 0x00000080 |
| 85 | |
| 86 | #define VM_GROWSDOWN 0x00000100 /* general info on the segment */ |
| 87 | #define VM_GROWSUP 0x00000200 |
Linus Torvalds | 6aab341 | 2005-11-28 14:34:23 -0800 | [diff] [blame] | 88 | #define VM_PFNMAP 0x00000400 /* Page-ranges managed without "struct page", just pure PFN */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | #define VM_DENYWRITE 0x00000800 /* ETXTBSY on write attempts.. */ |
| 90 | |
| 91 | #define VM_EXECUTABLE 0x00001000 |
| 92 | #define VM_LOCKED 0x00002000 |
| 93 | #define VM_IO 0x00004000 /* Memory mapped I/O or similar */ |
| 94 | |
| 95 | /* Used by sys_madvise() */ |
| 96 | #define VM_SEQ_READ 0x00008000 /* App will access data sequentially */ |
| 97 | #define VM_RAND_READ 0x00010000 /* App will not benefit from clustered reads */ |
| 98 | |
| 99 | #define VM_DONTCOPY 0x00020000 /* Do not copy this vma on fork */ |
| 100 | #define VM_DONTEXPAND 0x00040000 /* Cannot expand with mremap() */ |
Hugh Dickins | 0b14c17 | 2005-11-21 21:32:15 -0800 | [diff] [blame] | 101 | #define VM_RESERVED 0x00080000 /* Count as reserved_vm like IO */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | #define VM_ACCOUNT 0x00100000 /* Is a VM accounted object */ |
| 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) */ |
Linus Torvalds | 4d7672b | 2005-12-16 10:21:23 -0800 | [diff] [blame] | 106 | #define VM_INSERTPAGE 0x02000000 /* The vma has had "vm_insert_page()" done on it */ |
Roland McGrath | e5b97dd | 2007-01-26 00:56:48 -0800 | [diff] [blame] | 107 | #define VM_ALWAYSDUMP 0x04000000 /* Always include in core dumps */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | |
Nick Piggin | d0217ac | 2007-07-19 01:47:03 -0700 | [diff] [blame] | 109 | #define VM_CAN_NONLINEAR 0x08000000 /* Has ->fault & does nonlinear pages */ |
Nick Piggin | d00806b | 2007-07-19 01:46:57 -0700 | [diff] [blame] | 110 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | #ifndef VM_STACK_DEFAULT_FLAGS /* arch can override this */ |
| 112 | #define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS |
| 113 | #endif |
| 114 | |
| 115 | #ifdef CONFIG_STACK_GROWSUP |
| 116 | #define VM_STACK_FLAGS (VM_GROWSUP | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT) |
| 117 | #else |
| 118 | #define VM_STACK_FLAGS (VM_GROWSDOWN | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT) |
| 119 | #endif |
| 120 | |
| 121 | #define VM_READHINTMASK (VM_SEQ_READ | VM_RAND_READ) |
| 122 | #define VM_ClearReadHint(v) (v)->vm_flags &= ~VM_READHINTMASK |
| 123 | #define VM_NormalReadHint(v) (!((v)->vm_flags & VM_READHINTMASK)) |
| 124 | #define VM_SequentialReadHint(v) ((v)->vm_flags & VM_SEQ_READ) |
| 125 | #define VM_RandomReadHint(v) ((v)->vm_flags & VM_RAND_READ) |
| 126 | |
| 127 | /* |
| 128 | * mapping from the currently active vm_flags protection bits (the |
| 129 | * low four bits) to a page protection mask.. |
| 130 | */ |
| 131 | extern pgprot_t protection_map[16]; |
| 132 | |
Nick Piggin | d0217ac | 2007-07-19 01:47:03 -0700 | [diff] [blame] | 133 | #define FAULT_FLAG_WRITE 0x01 /* Fault was a write access */ |
| 134 | #define FAULT_FLAG_NONLINEAR 0x02 /* Fault was via a nonlinear mapping */ |
| 135 | |
| 136 | |
Nick Piggin | 54cb882 | 2007-07-19 01:46:59 -0700 | [diff] [blame] | 137 | /* |
Nick Piggin | d0217ac | 2007-07-19 01:47:03 -0700 | [diff] [blame] | 138 | * vm_fault is filled by the the pagefault handler and passed to the vma's |
Nick Piggin | 83c5407 | 2007-07-19 01:47:05 -0700 | [diff] [blame] | 139 | * ->fault function. The vma's ->fault is responsible for returning a bitmask |
| 140 | * of VM_FAULT_xxx flags that give details about how the fault was handled. |
Nick Piggin | 54cb882 | 2007-07-19 01:46:59 -0700 | [diff] [blame] | 141 | * |
Nick Piggin | d0217ac | 2007-07-19 01:47:03 -0700 | [diff] [blame] | 142 | * pgoff should be used in favour of virtual_address, if possible. If pgoff |
| 143 | * is used, one may set VM_CAN_NONLINEAR in the vma->vm_flags to get nonlinear |
| 144 | * mapping support. |
Nick Piggin | 54cb882 | 2007-07-19 01:46:59 -0700 | [diff] [blame] | 145 | */ |
Nick Piggin | d0217ac | 2007-07-19 01:47:03 -0700 | [diff] [blame] | 146 | struct vm_fault { |
| 147 | unsigned int flags; /* FAULT_FLAG_xxx flags */ |
| 148 | pgoff_t pgoff; /* Logical page offset based on vma */ |
| 149 | void __user *virtual_address; /* Faulting virtual address */ |
| 150 | |
| 151 | struct page *page; /* ->fault handlers should return a |
Nick Piggin | 83c5407 | 2007-07-19 01:47:05 -0700 | [diff] [blame] | 152 | * page here, unless VM_FAULT_NOPAGE |
Nick Piggin | d0217ac | 2007-07-19 01:47:03 -0700 | [diff] [blame] | 153 | * is set (which is also implied by |
Nick Piggin | 83c5407 | 2007-07-19 01:47:05 -0700 | [diff] [blame] | 154 | * VM_FAULT_ERROR). |
Nick Piggin | d0217ac | 2007-07-19 01:47:03 -0700 | [diff] [blame] | 155 | */ |
Nick Piggin | 54cb882 | 2007-07-19 01:46:59 -0700 | [diff] [blame] | 156 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | |
| 158 | /* |
| 159 | * These are the virtual MM functions - opening of an area, closing and |
| 160 | * unmapping it (needed to keep files on disk up-to-date etc), pointer |
| 161 | * to the functions called when a no-page or a wp-page exception occurs. |
| 162 | */ |
| 163 | struct vm_operations_struct { |
| 164 | void (*open)(struct vm_area_struct * area); |
| 165 | void (*close)(struct vm_area_struct * area); |
Nick Piggin | d0217ac | 2007-07-19 01:47:03 -0700 | [diff] [blame] | 166 | int (*fault)(struct vm_area_struct *vma, struct vm_fault *vmf); |
Nick Piggin | 54cb882 | 2007-07-19 01:46:59 -0700 | [diff] [blame] | 167 | struct page *(*nopage)(struct vm_area_struct *area, |
| 168 | unsigned long address, int *type); |
| 169 | unsigned long (*nopfn)(struct vm_area_struct *area, |
| 170 | unsigned long address); |
David Howells | 9637a5e | 2006-06-23 02:03:43 -0700 | [diff] [blame] | 171 | |
| 172 | /* notification that a previously read-only page is about to become |
| 173 | * writable, if an error is returned it will cause a SIGBUS */ |
| 174 | int (*page_mkwrite)(struct vm_area_struct *vma, struct page *page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | #ifdef CONFIG_NUMA |
| 176 | int (*set_policy)(struct vm_area_struct *vma, struct mempolicy *new); |
| 177 | struct mempolicy *(*get_policy)(struct vm_area_struct *vma, |
| 178 | unsigned long addr); |
Christoph Lameter | 7b2259b | 2006-06-25 05:46:48 -0700 | [diff] [blame] | 179 | int (*migrate)(struct vm_area_struct *vma, const nodemask_t *from, |
| 180 | const nodemask_t *to, unsigned long flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | #endif |
| 182 | }; |
| 183 | |
| 184 | struct mmu_gather; |
| 185 | struct inode; |
| 186 | |
Andrew Morton | 349aef0 | 2006-01-08 01:04:36 -0800 | [diff] [blame] | 187 | #define page_private(page) ((page)->private) |
| 188 | #define set_page_private(page, v) ((page)->private = (v)) |
Hugh Dickins | 4c21e2f | 2005-10-29 18:16:40 -0700 | [diff] [blame] | 189 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | /* |
| 191 | * FIXME: take this include out, include page-flags.h in |
| 192 | * files which need it (119 of them) |
| 193 | */ |
| 194 | #include <linux/page-flags.h> |
| 195 | |
Nick Piggin | 725d704 | 2006-09-25 23:30:55 -0700 | [diff] [blame] | 196 | #ifdef CONFIG_DEBUG_VM |
| 197 | #define VM_BUG_ON(cond) BUG_ON(cond) |
| 198 | #else |
| 199 | #define VM_BUG_ON(condition) do { } while(0) |
| 200 | #endif |
| 201 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | /* |
| 203 | * Methods to modify the page usage count. |
| 204 | * |
| 205 | * What counts for a page usage: |
| 206 | * - cache mapping (page->mapping) |
| 207 | * - private data (page->private) |
| 208 | * - page mapped in a task's page tables, each mapping |
| 209 | * is counted separately |
| 210 | * |
| 211 | * Also, many kernel routines increase the page count before a critical |
| 212 | * routine so they can be sure the page doesn't go away from under them. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | */ |
| 214 | |
| 215 | /* |
Nick Piggin | da6052f | 2006-09-25 23:31:35 -0700 | [diff] [blame] | 216 | * Drop a ref, return true if the refcount fell to zero (the page has no users) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | */ |
Nick Piggin | 7c8ee9a | 2006-03-22 00:08:03 -0800 | [diff] [blame] | 218 | static inline int put_page_testzero(struct page *page) |
| 219 | { |
Nick Piggin | 725d704 | 2006-09-25 23:30:55 -0700 | [diff] [blame] | 220 | VM_BUG_ON(atomic_read(&page->_count) == 0); |
Nick Piggin | 8dc04ef | 2006-03-22 00:08:03 -0800 | [diff] [blame] | 221 | return atomic_dec_and_test(&page->_count); |
Nick Piggin | 7c8ee9a | 2006-03-22 00:08:03 -0800 | [diff] [blame] | 222 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | |
| 224 | /* |
Nick Piggin | 7c8ee9a | 2006-03-22 00:08:03 -0800 | [diff] [blame] | 225 | * Try to grab a ref unless the page has a refcount of zero, return false if |
| 226 | * that is the case. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | */ |
Nick Piggin | 7c8ee9a | 2006-03-22 00:08:03 -0800 | [diff] [blame] | 228 | static inline int get_page_unless_zero(struct page *page) |
| 229 | { |
Nick Piggin | 725d704 | 2006-09-25 23:30:55 -0700 | [diff] [blame] | 230 | VM_BUG_ON(PageCompound(page)); |
Nick Piggin | 8dc04ef | 2006-03-22 00:08:03 -0800 | [diff] [blame] | 231 | return atomic_inc_not_zero(&page->_count); |
Nick Piggin | 7c8ee9a | 2006-03-22 00:08:03 -0800 | [diff] [blame] | 232 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | |
Christoph Lameter | d85f338 | 2007-05-06 14:49:39 -0700 | [diff] [blame] | 234 | static inline struct page *compound_head(struct page *page) |
| 235 | { |
Christoph Lameter | 6d77795 | 2007-05-06 14:49:40 -0700 | [diff] [blame] | 236 | if (unlikely(PageTail(page))) |
Christoph Lameter | d85f338 | 2007-05-06 14:49:39 -0700 | [diff] [blame] | 237 | return page->first_page; |
| 238 | return page; |
| 239 | } |
| 240 | |
Hugh Dickins | 4c21e2f | 2005-10-29 18:16:40 -0700 | [diff] [blame] | 241 | static inline int page_count(struct page *page) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | { |
Christoph Lameter | d85f338 | 2007-05-06 14:49:39 -0700 | [diff] [blame] | 243 | return atomic_read(&compound_head(page)->_count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | } |
| 245 | |
| 246 | static inline void get_page(struct page *page) |
| 247 | { |
Christoph Lameter | d85f338 | 2007-05-06 14:49:39 -0700 | [diff] [blame] | 248 | page = compound_head(page); |
Nick Piggin | 725d704 | 2006-09-25 23:30:55 -0700 | [diff] [blame] | 249 | VM_BUG_ON(atomic_read(&page->_count) == 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | atomic_inc(&page->_count); |
| 251 | } |
| 252 | |
Christoph Lameter | b49af68 | 2007-05-06 14:49:41 -0700 | [diff] [blame] | 253 | static inline struct page *virt_to_head_page(const void *x) |
| 254 | { |
| 255 | struct page *page = virt_to_page(x); |
| 256 | return compound_head(page); |
| 257 | } |
| 258 | |
Nick Piggin | 7835e98 | 2006-03-22 00:08:40 -0800 | [diff] [blame] | 259 | /* |
| 260 | * Setup the page count before being freed into the page allocator for |
| 261 | * the first time (boot or memory hotplug) |
| 262 | */ |
| 263 | static inline void init_page_count(struct page *page) |
| 264 | { |
| 265 | atomic_set(&page->_count, 1); |
| 266 | } |
| 267 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 268 | void put_page(struct page *page); |
Alexander Zarochentsev | 1d7ea73 | 2006-08-13 23:24:27 -0700 | [diff] [blame] | 269 | void put_pages_list(struct list_head *pages); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 270 | |
Nick Piggin | 8dfcc9b | 2006-03-22 00:08:05 -0800 | [diff] [blame] | 271 | void split_page(struct page *page, unsigned int order); |
Nick Piggin | 8dfcc9b | 2006-03-22 00:08:05 -0800 | [diff] [blame] | 272 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 273 | /* |
Andy Whitcroft | 33f2ef8 | 2006-12-06 20:33:32 -0800 | [diff] [blame] | 274 | * Compound pages have a destructor function. Provide a |
| 275 | * prototype for that function and accessor functions. |
| 276 | * These are _only_ valid on the head of a PG_compound page. |
| 277 | */ |
| 278 | typedef void compound_page_dtor(struct page *); |
| 279 | |
| 280 | static inline void set_compound_page_dtor(struct page *page, |
| 281 | compound_page_dtor *dtor) |
| 282 | { |
| 283 | page[1].lru.next = (void *)dtor; |
| 284 | } |
| 285 | |
| 286 | static inline compound_page_dtor *get_compound_page_dtor(struct page *page) |
| 287 | { |
| 288 | return (compound_page_dtor *)page[1].lru.next; |
| 289 | } |
| 290 | |
Christoph Lameter | d85f338 | 2007-05-06 14:49:39 -0700 | [diff] [blame] | 291 | static inline int compound_order(struct page *page) |
| 292 | { |
Christoph Lameter | 6d77795 | 2007-05-06 14:49:40 -0700 | [diff] [blame] | 293 | if (!PageHead(page)) |
Christoph Lameter | d85f338 | 2007-05-06 14:49:39 -0700 | [diff] [blame] | 294 | return 0; |
| 295 | return (unsigned long)page[1].lru.prev; |
| 296 | } |
| 297 | |
| 298 | static inline void set_compound_order(struct page *page, unsigned long order) |
| 299 | { |
| 300 | page[1].lru.prev = (void *)order; |
| 301 | } |
| 302 | |
Andy Whitcroft | 33f2ef8 | 2006-12-06 20:33:32 -0800 | [diff] [blame] | 303 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | * Multiple processes may "see" the same page. E.g. for untouched |
| 305 | * mappings of /dev/null, all processes see the same page full of |
| 306 | * zeroes, and text pages of executables and shared libraries have |
| 307 | * only one copy in memory, at most, normally. |
| 308 | * |
| 309 | * For the non-reserved pages, page_count(page) denotes a reference count. |
Paolo 'Blaisorblade' Giarrusso | 7e871b6 | 2005-09-21 09:55:38 -0700 | [diff] [blame] | 310 | * page_count() == 0 means the page is free. page->lru is then used for |
| 311 | * freelist management in the buddy allocator. |
Nick Piggin | da6052f | 2006-09-25 23:31:35 -0700 | [diff] [blame] | 312 | * page_count() > 0 means the page has been allocated. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | * |
Nick Piggin | da6052f | 2006-09-25 23:31:35 -0700 | [diff] [blame] | 314 | * Pages are allocated by the slab allocator in order to provide memory |
| 315 | * to kmalloc and kmem_cache_alloc. In this case, the management of the |
| 316 | * page, and the fields in 'struct page' are the responsibility of mm/slab.c |
| 317 | * unless a particular usage is carefully commented. (the responsibility of |
| 318 | * freeing the kmalloc memory is the caller's, of course). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | * |
Nick Piggin | da6052f | 2006-09-25 23:31:35 -0700 | [diff] [blame] | 320 | * A page may be used by anyone else who does a __get_free_page(). |
| 321 | * In this case, page_count still tracks the references, and should only |
| 322 | * be used through the normal accessor functions. The top bits of page->flags |
| 323 | * and page->virtual store page management information, but all other fields |
| 324 | * are unused and could be used privately, carefully. The management of this |
| 325 | * page is the responsibility of the one who allocated it, and those who have |
| 326 | * subsequently been given references to it. |
| 327 | * |
| 328 | * The other pages (we may call them "pagecache pages") are completely |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | * managed by the Linux memory manager: I/O, buffers, swapping etc. |
| 330 | * The following discussion applies only to them. |
| 331 | * |
Nick Piggin | da6052f | 2006-09-25 23:31:35 -0700 | [diff] [blame] | 332 | * A pagecache page contains an opaque `private' member, which belongs to the |
| 333 | * page's address_space. Usually, this is the address of a circular list of |
| 334 | * the page's disk buffers. PG_private must be set to tell the VM to call |
| 335 | * into the filesystem to release these pages. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 336 | * |
Nick Piggin | da6052f | 2006-09-25 23:31:35 -0700 | [diff] [blame] | 337 | * A page may belong to an inode's memory mapping. In this case, page->mapping |
| 338 | * is the pointer to the inode, and page->index is the file offset of the page, |
| 339 | * in units of PAGE_CACHE_SIZE. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | * |
Nick Piggin | da6052f | 2006-09-25 23:31:35 -0700 | [diff] [blame] | 341 | * If pagecache pages are not associated with an inode, they are said to be |
| 342 | * anonymous pages. These may become associated with the swapcache, and in that |
| 343 | * case PG_swapcache is set, and page->private is an offset into the swapcache. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | * |
Nick Piggin | da6052f | 2006-09-25 23:31:35 -0700 | [diff] [blame] | 345 | * In either case (swapcache or inode backed), the pagecache itself holds one |
| 346 | * reference to the page. Setting PG_private should also increment the |
| 347 | * refcount. The each user mapping also has a reference to the page. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 348 | * |
Nick Piggin | da6052f | 2006-09-25 23:31:35 -0700 | [diff] [blame] | 349 | * The pagecache pages are stored in a per-mapping radix tree, which is |
| 350 | * rooted at mapping->page_tree, and indexed by offset. |
| 351 | * Where 2.4 and early 2.6 kernels kept dirty/clean pages in per-address_space |
| 352 | * lists, we instead now tag pages as dirty/writeback in the radix tree. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | * |
Nick Piggin | da6052f | 2006-09-25 23:31:35 -0700 | [diff] [blame] | 354 | * All pagecache pages may be subject to I/O: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | * - inode pages may need to be read from disk, |
| 356 | * - inode pages which have been modified and are MAP_SHARED may need |
Nick Piggin | da6052f | 2006-09-25 23:31:35 -0700 | [diff] [blame] | 357 | * to be written back to the inode on disk, |
| 358 | * - anonymous pages (including MAP_PRIVATE file mappings) which have been |
| 359 | * modified may need to be swapped out to swap space and (later) to be read |
| 360 | * back into memory. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | */ |
| 362 | |
| 363 | /* |
| 364 | * The zone field is never updated after free_area_init_core() |
| 365 | * sets it, so none of the operations on it need to be atomic. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | */ |
Dave Hansen | 348f8b6 | 2005-06-23 00:07:40 -0700 | [diff] [blame] | 367 | |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 368 | |
| 369 | /* |
| 370 | * page->flags layout: |
| 371 | * |
| 372 | * There are three possibilities for how page->flags get |
| 373 | * laid out. The first is for the normal case, without |
| 374 | * sparsemem. The second is for sparsemem when there is |
| 375 | * plenty of space for node and section. The last is when |
| 376 | * we have run out of space and have to fall back to an |
| 377 | * alternate (slower) way of determining the node. |
| 378 | * |
| 379 | * No sparsemem: | NODE | ZONE | ... | FLAGS | |
| 380 | * with space for node: | SECTION | NODE | ZONE | ... | FLAGS | |
| 381 | * no space for node: | SECTION | ZONE | ... | FLAGS | |
| 382 | */ |
| 383 | #ifdef CONFIG_SPARSEMEM |
| 384 | #define SECTIONS_WIDTH SECTIONS_SHIFT |
| 385 | #else |
| 386 | #define SECTIONS_WIDTH 0 |
| 387 | #endif |
| 388 | |
| 389 | #define ZONES_WIDTH ZONES_SHIFT |
| 390 | |
| 391 | #if SECTIONS_WIDTH+ZONES_WIDTH+NODES_SHIFT <= FLAGS_RESERVED |
| 392 | #define NODES_WIDTH NODES_SHIFT |
| 393 | #else |
| 394 | #define NODES_WIDTH 0 |
| 395 | #endif |
| 396 | |
| 397 | /* Page flags: | [SECTION] | [NODE] | ZONE | ... | FLAGS | */ |
Andi Kleen | 07808b7 | 2005-11-05 17:25:53 +0100 | [diff] [blame] | 398 | #define SECTIONS_PGOFF ((sizeof(unsigned long)*8) - SECTIONS_WIDTH) |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 399 | #define NODES_PGOFF (SECTIONS_PGOFF - NODES_WIDTH) |
| 400 | #define ZONES_PGOFF (NODES_PGOFF - ZONES_WIDTH) |
| 401 | |
| 402 | /* |
| 403 | * We are going to use the flags for the page to node mapping if its in |
| 404 | * there. This includes the case where there is no node, so it is implicit. |
| 405 | */ |
Christoph Lameter | 89689ae | 2006-12-06 20:31:45 -0800 | [diff] [blame] | 406 | #if !(NODES_WIDTH > 0 || NODES_SHIFT == 0) |
| 407 | #define NODE_NOT_IN_PAGE_FLAGS |
| 408 | #endif |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 409 | |
| 410 | #ifndef PFN_SECTION_SHIFT |
| 411 | #define PFN_SECTION_SHIFT 0 |
| 412 | #endif |
Dave Hansen | 348f8b6 | 2005-06-23 00:07:40 -0700 | [diff] [blame] | 413 | |
| 414 | /* |
| 415 | * Define the bit shifts to access each section. For non-existant |
| 416 | * sections we define the shift as 0; that plus a 0 mask ensures |
| 417 | * the compiler will optimise away reference to them. |
| 418 | */ |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 419 | #define SECTIONS_PGSHIFT (SECTIONS_PGOFF * (SECTIONS_WIDTH != 0)) |
| 420 | #define NODES_PGSHIFT (NODES_PGOFF * (NODES_WIDTH != 0)) |
| 421 | #define ZONES_PGSHIFT (ZONES_PGOFF * (ZONES_WIDTH != 0)) |
Dave Hansen | 348f8b6 | 2005-06-23 00:07:40 -0700 | [diff] [blame] | 422 | |
Christoph Lameter | 89689ae | 2006-12-06 20:31:45 -0800 | [diff] [blame] | 423 | /* NODE:ZONE or SECTION:ZONE is used to ID a zone for the buddy allcator */ |
| 424 | #ifdef NODE_NOT_IN_PAGEFLAGS |
| 425 | #define ZONEID_SHIFT (SECTIONS_SHIFT + ZONES_SHIFT) |
Andy Whitcroft | bd8029b | 2007-02-10 01:43:14 -0800 | [diff] [blame] | 426 | #define ZONEID_PGOFF ((SECTIONS_PGOFF < ZONES_PGOFF)? \ |
| 427 | SECTIONS_PGOFF : ZONES_PGOFF) |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 428 | #else |
Christoph Lameter | 89689ae | 2006-12-06 20:31:45 -0800 | [diff] [blame] | 429 | #define ZONEID_SHIFT (NODES_SHIFT + ZONES_SHIFT) |
Andy Whitcroft | bd8029b | 2007-02-10 01:43:14 -0800 | [diff] [blame] | 430 | #define ZONEID_PGOFF ((NODES_PGOFF < ZONES_PGOFF)? \ |
| 431 | NODES_PGOFF : ZONES_PGOFF) |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 432 | #endif |
Christoph Lameter | 89689ae | 2006-12-06 20:31:45 -0800 | [diff] [blame] | 433 | |
Andy Whitcroft | bd8029b | 2007-02-10 01:43:14 -0800 | [diff] [blame] | 434 | #define ZONEID_PGSHIFT (ZONEID_PGOFF * (ZONEID_SHIFT != 0)) |
Dave Hansen | 348f8b6 | 2005-06-23 00:07:40 -0700 | [diff] [blame] | 435 | |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 436 | #if SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > FLAGS_RESERVED |
| 437 | #error SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > FLAGS_RESERVED |
Dave Hansen | 348f8b6 | 2005-06-23 00:07:40 -0700 | [diff] [blame] | 438 | #endif |
| 439 | |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 440 | #define ZONES_MASK ((1UL << ZONES_WIDTH) - 1) |
| 441 | #define NODES_MASK ((1UL << NODES_WIDTH) - 1) |
| 442 | #define SECTIONS_MASK ((1UL << SECTIONS_WIDTH) - 1) |
Christoph Lameter | 89689ae | 2006-12-06 20:31:45 -0800 | [diff] [blame] | 443 | #define ZONEID_MASK ((1UL << ZONEID_SHIFT) - 1) |
Dave Hansen | 348f8b6 | 2005-06-23 00:07:40 -0700 | [diff] [blame] | 444 | |
Christoph Lameter | 2f1b624 | 2006-09-25 23:31:13 -0700 | [diff] [blame] | 445 | static inline enum zone_type page_zonenum(struct page *page) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | { |
Dave Hansen | 348f8b6 | 2005-06-23 00:07:40 -0700 | [diff] [blame] | 447 | return (page->flags >> ZONES_PGSHIFT) & ZONES_MASK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 448 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 449 | |
Christoph Lameter | 89689ae | 2006-12-06 20:31:45 -0800 | [diff] [blame] | 450 | /* |
| 451 | * The identification function is only used by the buddy allocator for |
| 452 | * determining if two pages could be buddies. We are not really |
| 453 | * identifying a zone since we could be using a the section number |
| 454 | * id if we have not node id available in page flags. |
| 455 | * We guarantee only that it will return the same value for two |
| 456 | * combinable pages in a zone. |
| 457 | */ |
Andy Whitcroft | cb2b95e | 2006-06-23 02:03:01 -0700 | [diff] [blame] | 458 | static inline int page_zone_id(struct page *page) |
| 459 | { |
Christoph Lameter | 89689ae | 2006-12-06 20:31:45 -0800 | [diff] [blame] | 460 | return (page->flags >> ZONEID_PGSHIFT) & ZONEID_MASK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | } |
| 462 | |
Andy Whitcroft | 25ba77c | 2006-12-06 20:33:03 -0800 | [diff] [blame] | 463 | static inline int zone_to_nid(struct zone *zone) |
Christoph Lameter | 89fa302 | 2006-09-25 23:31:55 -0700 | [diff] [blame] | 464 | { |
Christoph Lameter | d5f541e | 2006-09-27 01:50:08 -0700 | [diff] [blame] | 465 | #ifdef CONFIG_NUMA |
| 466 | return zone->node; |
| 467 | #else |
| 468 | return 0; |
| 469 | #endif |
Christoph Lameter | 89fa302 | 2006-09-25 23:31:55 -0700 | [diff] [blame] | 470 | } |
| 471 | |
Christoph Lameter | 89689ae | 2006-12-06 20:31:45 -0800 | [diff] [blame] | 472 | #ifdef NODE_NOT_IN_PAGE_FLAGS |
Andy Whitcroft | 25ba77c | 2006-12-06 20:33:03 -0800 | [diff] [blame] | 473 | extern int page_to_nid(struct page *page); |
Christoph Lameter | 89689ae | 2006-12-06 20:31:45 -0800 | [diff] [blame] | 474 | #else |
Andy Whitcroft | 25ba77c | 2006-12-06 20:33:03 -0800 | [diff] [blame] | 475 | static inline int page_to_nid(struct page *page) |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 476 | { |
Christoph Lameter | 89689ae | 2006-12-06 20:31:45 -0800 | [diff] [blame] | 477 | return (page->flags >> NODES_PGSHIFT) & NODES_MASK; |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 478 | } |
Christoph Lameter | 89689ae | 2006-12-06 20:31:45 -0800 | [diff] [blame] | 479 | #endif |
| 480 | |
| 481 | static inline struct zone *page_zone(struct page *page) |
| 482 | { |
| 483 | return &NODE_DATA(page_to_nid(page))->node_zones[page_zonenum(page)]; |
| 484 | } |
| 485 | |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 486 | static inline unsigned long page_to_section(struct page *page) |
| 487 | { |
| 488 | return (page->flags >> SECTIONS_PGSHIFT) & SECTIONS_MASK; |
| 489 | } |
| 490 | |
Christoph Lameter | 2f1b624 | 2006-09-25 23:31:13 -0700 | [diff] [blame] | 491 | static inline void set_page_zone(struct page *page, enum zone_type zone) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 492 | { |
Dave Hansen | 348f8b6 | 2005-06-23 00:07:40 -0700 | [diff] [blame] | 493 | page->flags &= ~(ZONES_MASK << ZONES_PGSHIFT); |
| 494 | page->flags |= (zone & ZONES_MASK) << ZONES_PGSHIFT; |
| 495 | } |
Christoph Lameter | 2f1b624 | 2006-09-25 23:31:13 -0700 | [diff] [blame] | 496 | |
Dave Hansen | 348f8b6 | 2005-06-23 00:07:40 -0700 | [diff] [blame] | 497 | static inline void set_page_node(struct page *page, unsigned long node) |
| 498 | { |
| 499 | page->flags &= ~(NODES_MASK << NODES_PGSHIFT); |
| 500 | page->flags |= (node & NODES_MASK) << NODES_PGSHIFT; |
| 501 | } |
Christoph Lameter | 89689ae | 2006-12-06 20:31:45 -0800 | [diff] [blame] | 502 | |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 503 | static inline void set_page_section(struct page *page, unsigned long section) |
| 504 | { |
| 505 | page->flags &= ~(SECTIONS_MASK << SECTIONS_PGSHIFT); |
| 506 | page->flags |= (section & SECTIONS_MASK) << SECTIONS_PGSHIFT; |
| 507 | } |
Dave Hansen | 348f8b6 | 2005-06-23 00:07:40 -0700 | [diff] [blame] | 508 | |
Christoph Lameter | 2f1b624 | 2006-09-25 23:31:13 -0700 | [diff] [blame] | 509 | static inline void set_page_links(struct page *page, enum zone_type zone, |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 510 | unsigned long node, unsigned long pfn) |
Dave Hansen | 348f8b6 | 2005-06-23 00:07:40 -0700 | [diff] [blame] | 511 | { |
| 512 | set_page_zone(page, zone); |
| 513 | set_page_node(page, node); |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 514 | set_page_section(page, pfn_to_section_nr(pfn)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | } |
| 516 | |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 517 | /* |
Eric Paris | 7cd9414 | 2007-11-26 18:47:40 -0500 | [diff] [blame] | 518 | * If a hint addr is less than mmap_min_addr change hint to be as |
| 519 | * low as possible but still greater than mmap_min_addr |
| 520 | */ |
| 521 | static inline unsigned long round_hint_to_min(unsigned long hint) |
| 522 | { |
| 523 | #ifdef CONFIG_SECURITY |
| 524 | hint &= PAGE_MASK; |
| 525 | if (((void *)hint != NULL) && |
| 526 | (hint < mmap_min_addr)) |
| 527 | return PAGE_ALIGN(mmap_min_addr); |
| 528 | #endif |
| 529 | return hint; |
| 530 | } |
| 531 | |
| 532 | /* |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 533 | * Some inline functions in vmstat.h depend on page_zone() |
| 534 | */ |
| 535 | #include <linux/vmstat.h> |
| 536 | |
Ingo Molnar | 652050a | 2006-01-14 13:21:30 -0800 | [diff] [blame] | 537 | static __always_inline void *lowmem_page_address(struct page *page) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | { |
| 539 | return __va(page_to_pfn(page) << PAGE_SHIFT); |
| 540 | } |
| 541 | |
| 542 | #if defined(CONFIG_HIGHMEM) && !defined(WANT_PAGE_VIRTUAL) |
| 543 | #define HASHED_PAGE_VIRTUAL |
| 544 | #endif |
| 545 | |
| 546 | #if defined(WANT_PAGE_VIRTUAL) |
| 547 | #define page_address(page) ((page)->virtual) |
| 548 | #define set_page_address(page, address) \ |
| 549 | do { \ |
| 550 | (page)->virtual = (address); \ |
| 551 | } while(0) |
| 552 | #define page_address_init() do { } while(0) |
| 553 | #endif |
| 554 | |
| 555 | #if defined(HASHED_PAGE_VIRTUAL) |
| 556 | void *page_address(struct page *page); |
| 557 | void set_page_address(struct page *page, void *virtual); |
| 558 | void page_address_init(void); |
| 559 | #endif |
| 560 | |
| 561 | #if !defined(HASHED_PAGE_VIRTUAL) && !defined(WANT_PAGE_VIRTUAL) |
| 562 | #define page_address(page) lowmem_page_address(page) |
| 563 | #define set_page_address(page, address) do { } while(0) |
| 564 | #define page_address_init() do { } while(0) |
| 565 | #endif |
| 566 | |
| 567 | /* |
| 568 | * On an anonymous page mapped into a user virtual memory area, |
| 569 | * page->mapping points to its anon_vma, not to a struct address_space; |
| 570 | * with the PAGE_MAPPING_ANON bit set to distinguish it. |
| 571 | * |
| 572 | * Please note that, confusingly, "page_mapping" refers to the inode |
| 573 | * address_space which maps the page from disk; whereas "page_mapped" |
| 574 | * refers to user virtual address space into which the page is mapped. |
| 575 | */ |
| 576 | #define PAGE_MAPPING_ANON 1 |
| 577 | |
| 578 | extern struct address_space swapper_space; |
| 579 | static inline struct address_space *page_mapping(struct page *page) |
| 580 | { |
| 581 | struct address_space *mapping = page->mapping; |
| 582 | |
Christoph Lameter | b5fab14 | 2007-07-17 04:03:33 -0700 | [diff] [blame] | 583 | VM_BUG_ON(PageSlab(page)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 584 | if (unlikely(PageSwapCache(page))) |
| 585 | mapping = &swapper_space; |
| 586 | else if (unlikely((unsigned long)mapping & PAGE_MAPPING_ANON)) |
| 587 | mapping = NULL; |
| 588 | return mapping; |
| 589 | } |
| 590 | |
| 591 | static inline int PageAnon(struct page *page) |
| 592 | { |
| 593 | return ((unsigned long)page->mapping & PAGE_MAPPING_ANON) != 0; |
| 594 | } |
| 595 | |
| 596 | /* |
| 597 | * Return the pagecache index of the passed page. Regular pagecache pages |
| 598 | * use ->index whereas swapcache pages use ->private |
| 599 | */ |
| 600 | static inline pgoff_t page_index(struct page *page) |
| 601 | { |
| 602 | if (unlikely(PageSwapCache(page))) |
Hugh Dickins | 4c21e2f | 2005-10-29 18:16:40 -0700 | [diff] [blame] | 603 | return page_private(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 604 | return page->index; |
| 605 | } |
| 606 | |
| 607 | /* |
| 608 | * The atomic page->_mapcount, like _count, starts from -1: |
| 609 | * so that transitions both from it and to it can be tracked, |
| 610 | * using atomic_inc_and_test and atomic_add_negative(-1). |
| 611 | */ |
| 612 | static inline void reset_page_mapcount(struct page *page) |
| 613 | { |
| 614 | atomic_set(&(page)->_mapcount, -1); |
| 615 | } |
| 616 | |
| 617 | static inline int page_mapcount(struct page *page) |
| 618 | { |
| 619 | return atomic_read(&(page)->_mapcount) + 1; |
| 620 | } |
| 621 | |
| 622 | /* |
| 623 | * Return true if this page is mapped into pagetables. |
| 624 | */ |
| 625 | static inline int page_mapped(struct page *page) |
| 626 | { |
| 627 | return atomic_read(&(page)->_mapcount) >= 0; |
| 628 | } |
| 629 | |
| 630 | /* |
| 631 | * Error return values for the *_nopage functions |
| 632 | */ |
| 633 | #define NOPAGE_SIGBUS (NULL) |
| 634 | #define NOPAGE_OOM ((struct page *) (-1)) |
| 635 | |
| 636 | /* |
Jes Sorensen | f4b8180 | 2006-09-27 01:50:10 -0700 | [diff] [blame] | 637 | * Error return values for the *_nopfn functions |
| 638 | */ |
| 639 | #define NOPFN_SIGBUS ((unsigned long) -1) |
| 640 | #define NOPFN_OOM ((unsigned long) -2) |
Benjamin Herrenschmidt | 22cd25e | 2007-02-12 00:51:38 -0800 | [diff] [blame] | 641 | #define NOPFN_REFAULT ((unsigned long) -3) |
Jes Sorensen | f4b8180 | 2006-09-27 01:50:10 -0700 | [diff] [blame] | 642 | |
| 643 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 644 | * Different kinds of faults, as returned by handle_mm_fault(). |
| 645 | * Used to decide whether a process gets delivered SIGBUS or |
| 646 | * just gets major/minor fault counters bumped up. |
| 647 | */ |
Nick Piggin | d0217ac | 2007-07-19 01:47:03 -0700 | [diff] [blame] | 648 | |
Nick Piggin | 83c5407 | 2007-07-19 01:47:05 -0700 | [diff] [blame] | 649 | #define VM_FAULT_MINOR 0 /* For backwards compat. Remove me quickly. */ |
Nick Piggin | d0217ac | 2007-07-19 01:47:03 -0700 | [diff] [blame] | 650 | |
Nick Piggin | 83c5407 | 2007-07-19 01:47:05 -0700 | [diff] [blame] | 651 | #define VM_FAULT_OOM 0x0001 |
| 652 | #define VM_FAULT_SIGBUS 0x0002 |
| 653 | #define VM_FAULT_MAJOR 0x0004 |
| 654 | #define VM_FAULT_WRITE 0x0008 /* Special case for get_user_pages */ |
Nick Piggin | f33ea7f | 2005-08-03 20:24:01 +1000 | [diff] [blame] | 655 | |
Nick Piggin | 83c5407 | 2007-07-19 01:47:05 -0700 | [diff] [blame] | 656 | #define VM_FAULT_NOPAGE 0x0100 /* ->fault installed the pte, not return page */ |
| 657 | #define VM_FAULT_LOCKED 0x0200 /* ->fault locked the returned page */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 658 | |
Nick Piggin | 83c5407 | 2007-07-19 01:47:05 -0700 | [diff] [blame] | 659 | #define VM_FAULT_ERROR (VM_FAULT_OOM | VM_FAULT_SIGBUS) |
Nick Piggin | d0217ac | 2007-07-19 01:47:03 -0700 | [diff] [blame] | 660 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 661 | #define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK) |
| 662 | |
| 663 | extern void show_free_areas(void); |
| 664 | |
| 665 | #ifdef CONFIG_SHMEM |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 666 | int shmem_lock(struct file *file, int lock, struct user_struct *user); |
| 667 | #else |
Russell King | 03b00eb | 2006-01-06 00:10:52 -0800 | [diff] [blame] | 668 | static inline int shmem_lock(struct file *file, int lock, |
| 669 | struct user_struct *user) |
| 670 | { |
| 671 | return 0; |
| 672 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 673 | #endif |
| 674 | struct file *shmem_file_setup(char *name, loff_t size, unsigned long flags); |
| 675 | |
| 676 | int shmem_zero_setup(struct vm_area_struct *); |
| 677 | |
David Howells | b0e1519 | 2006-01-06 00:11:42 -0800 | [diff] [blame] | 678 | #ifndef CONFIG_MMU |
| 679 | extern unsigned long shmem_get_unmapped_area(struct file *file, |
| 680 | unsigned long addr, |
| 681 | unsigned long len, |
| 682 | unsigned long pgoff, |
| 683 | unsigned long flags); |
| 684 | #endif |
| 685 | |
Alexey Dobriyan | e8edc6e | 2007-05-21 01:22:52 +0400 | [diff] [blame] | 686 | extern int can_do_mlock(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 687 | extern int user_shm_lock(size_t, struct user_struct *); |
| 688 | extern void user_shm_unlock(size_t, struct user_struct *); |
| 689 | |
| 690 | /* |
| 691 | * Parameter block passed down to zap_pte_range in exceptional cases. |
| 692 | */ |
| 693 | struct zap_details { |
| 694 | struct vm_area_struct *nonlinear_vma; /* Check page->index if set */ |
| 695 | struct address_space *check_mapping; /* Check page->mapping if set */ |
| 696 | pgoff_t first_index; /* Lowest page->index to unmap */ |
| 697 | pgoff_t last_index; /* Highest page->index to unmap */ |
| 698 | spinlock_t *i_mmap_lock; /* For unmap_mapping_range: */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 699 | unsigned long truncate_count; /* Compare vm_truncate_count */ |
| 700 | }; |
| 701 | |
Linus Torvalds | 6aab341 | 2005-11-28 14:34:23 -0800 | [diff] [blame] | 702 | struct page *vm_normal_page(struct vm_area_struct *, unsigned long, pte_t); |
Hugh Dickins | ee39b37 | 2005-04-19 13:29:15 -0700 | [diff] [blame] | 703 | unsigned long zap_page_range(struct vm_area_struct *vma, unsigned long address, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 704 | unsigned long size, struct zap_details *); |
Hugh Dickins | 508034a | 2005-10-29 18:16:30 -0700 | [diff] [blame] | 705 | unsigned long unmap_vmas(struct mmu_gather **tlb, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 706 | struct vm_area_struct *start_vma, unsigned long start_addr, |
| 707 | unsigned long end_addr, unsigned long *nr_accounted, |
| 708 | struct zap_details *); |
Hugh Dickins | 3bf5ee9 | 2005-04-19 13:29:16 -0700 | [diff] [blame] | 709 | void free_pgd_range(struct mmu_gather **tlb, unsigned long addr, |
| 710 | unsigned long end, unsigned long floor, unsigned long ceiling); |
| 711 | void free_pgtables(struct mmu_gather **tlb, struct vm_area_struct *start_vma, |
Hugh Dickins | e0da382 | 2005-04-19 13:29:15 -0700 | [diff] [blame] | 712 | unsigned long floor, unsigned long ceiling); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 713 | int copy_page_range(struct mm_struct *dst, struct mm_struct *src, |
| 714 | struct vm_area_struct *vma); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 715 | void unmap_mapping_range(struct address_space *mapping, |
| 716 | loff_t const holebegin, loff_t const holelen, int even_cows); |
| 717 | |
| 718 | static inline void unmap_shared_mapping_range(struct address_space *mapping, |
| 719 | loff_t const holebegin, loff_t const holelen) |
| 720 | { |
| 721 | unmap_mapping_range(mapping, holebegin, holelen, 0); |
| 722 | } |
| 723 | |
| 724 | extern int vmtruncate(struct inode * inode, loff_t offset); |
Badari Pulavarty | f6b3ec2 | 2006-01-06 00:10:38 -0800 | [diff] [blame] | 725 | extern int vmtruncate_range(struct inode * inode, loff_t offset, loff_t end); |
Nick Piggin | f33ea7f | 2005-08-03 20:24:01 +1000 | [diff] [blame] | 726 | |
David Howells | 7ee1dd3 | 2006-01-06 00:11:44 -0800 | [diff] [blame] | 727 | #ifdef CONFIG_MMU |
Nick Piggin | 83c5407 | 2007-07-19 01:47:05 -0700 | [diff] [blame] | 728 | extern int handle_mm_fault(struct mm_struct *mm, struct vm_area_struct *vma, |
David Howells | 7ee1dd3 | 2006-01-06 00:11:44 -0800 | [diff] [blame] | 729 | unsigned long address, int write_access); |
David Howells | 7ee1dd3 | 2006-01-06 00:11:44 -0800 | [diff] [blame] | 730 | #else |
| 731 | static inline int handle_mm_fault(struct mm_struct *mm, |
| 732 | struct vm_area_struct *vma, unsigned long address, |
| 733 | int write_access) |
| 734 | { |
| 735 | /* should never happen if there's no MMU */ |
| 736 | BUG(); |
| 737 | return VM_FAULT_SIGBUS; |
| 738 | } |
| 739 | #endif |
Nick Piggin | f33ea7f | 2005-08-03 20:24:01 +1000 | [diff] [blame] | 740 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 741 | extern int make_pages_present(unsigned long addr, unsigned long end); |
| 742 | extern int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, int len, int write); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 743 | |
| 744 | int get_user_pages(struct task_struct *tsk, struct mm_struct *mm, unsigned long start, |
| 745 | int len, int write, int force, struct page **pages, struct vm_area_struct **vmas); |
Nick Piggin | b581003 | 2005-10-29 18:16:12 -0700 | [diff] [blame] | 746 | void print_bad_pte(struct vm_area_struct *, pte_t, unsigned long); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 747 | |
David Howells | cf9a2ae | 2006-08-29 19:05:54 +0100 | [diff] [blame] | 748 | extern int try_to_release_page(struct page * page, gfp_t gfp_mask); |
| 749 | extern void do_invalidatepage(struct page *page, unsigned long offset); |
| 750 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | int __set_page_dirty_nobuffers(struct page *page); |
Ken Chen | 7671932 | 2007-02-10 01:43:15 -0800 | [diff] [blame] | 752 | int __set_page_dirty_no_writeback(struct page *page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 753 | int redirty_page_for_writepage(struct writeback_control *wbc, |
| 754 | struct page *page); |
| 755 | int FASTCALL(set_page_dirty(struct page *page)); |
| 756 | int set_page_dirty_lock(struct page *page); |
| 757 | int clear_page_dirty_for_io(struct page *page); |
| 758 | |
Ollie Wild | b6a2fea | 2007-07-19 01:48:16 -0700 | [diff] [blame] | 759 | extern unsigned long move_page_tables(struct vm_area_struct *vma, |
| 760 | unsigned long old_addr, struct vm_area_struct *new_vma, |
| 761 | unsigned long new_addr, unsigned long len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 762 | extern unsigned long do_mremap(unsigned long addr, |
| 763 | unsigned long old_len, unsigned long new_len, |
| 764 | unsigned long flags, unsigned long new_addr); |
Ollie Wild | b6a2fea | 2007-07-19 01:48:16 -0700 | [diff] [blame] | 765 | extern int mprotect_fixup(struct vm_area_struct *vma, |
| 766 | struct vm_area_struct **pprev, unsigned long start, |
| 767 | unsigned long end, unsigned long newflags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | |
| 769 | /* |
Rusty Russell | 8e1f936 | 2007-07-17 04:03:17 -0700 | [diff] [blame] | 770 | * A callback you can register to apply pressure to ageable caches. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 771 | * |
Rusty Russell | 8e1f936 | 2007-07-17 04:03:17 -0700 | [diff] [blame] | 772 | * 'shrink' is passed a count 'nr_to_scan' and a 'gfpmask'. It should |
| 773 | * look through the least-recently-used 'nr_to_scan' entries and |
| 774 | * attempt to free them up. It should return the number of objects |
| 775 | * which remain in the cache. If it returns -1, it means it cannot do |
| 776 | * any scanning at this time (eg. there is a risk of deadlock). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 777 | * |
Rusty Russell | 8e1f936 | 2007-07-17 04:03:17 -0700 | [diff] [blame] | 778 | * The 'gfpmask' refers to the allocation we are currently trying to |
| 779 | * fulfil. |
| 780 | * |
| 781 | * Note that 'shrink' will be passed nr_to_scan == 0 when the VM is |
| 782 | * querying the cache size, so a fastpath for that case is appropriate. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 783 | */ |
Rusty Russell | 8e1f936 | 2007-07-17 04:03:17 -0700 | [diff] [blame] | 784 | struct shrinker { |
| 785 | int (*shrink)(int nr_to_scan, gfp_t gfp_mask); |
| 786 | int seeks; /* seeks to recreate an obj */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 787 | |
Rusty Russell | 8e1f936 | 2007-07-17 04:03:17 -0700 | [diff] [blame] | 788 | /* These are for internal use */ |
| 789 | struct list_head list; |
| 790 | long nr; /* objs pending delete */ |
| 791 | }; |
| 792 | #define DEFAULT_SEEKS 2 /* A good number if you don't know better. */ |
| 793 | extern void register_shrinker(struct shrinker *); |
| 794 | extern void unregister_shrinker(struct shrinker *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 795 | |
Alexey Dobriyan | 4e950f6 | 2007-07-30 02:36:13 +0400 | [diff] [blame] | 796 | int vma_wants_writenotify(struct vm_area_struct *vma); |
Peter Zijlstra | d08b385 | 2006-09-25 23:30:57 -0700 | [diff] [blame] | 797 | |
Linus Torvalds | c9cfcdd | 2005-11-29 14:03:14 -0800 | [diff] [blame] | 798 | extern pte_t *FASTCALL(get_locked_pte(struct mm_struct *mm, unsigned long addr, spinlock_t **ptl)); |
| 799 | |
Nick Piggin | 5f22df0 | 2007-05-06 14:49:02 -0700 | [diff] [blame] | 800 | #ifdef __PAGETABLE_PUD_FOLDED |
| 801 | static inline int __pud_alloc(struct mm_struct *mm, pgd_t *pgd, |
| 802 | unsigned long address) |
| 803 | { |
| 804 | return 0; |
| 805 | } |
| 806 | #else |
Hugh Dickins | 1bb3630 | 2005-10-29 18:16:22 -0700 | [diff] [blame] | 807 | int __pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address); |
Nick Piggin | 5f22df0 | 2007-05-06 14:49:02 -0700 | [diff] [blame] | 808 | #endif |
| 809 | |
| 810 | #ifdef __PAGETABLE_PMD_FOLDED |
| 811 | static inline int __pmd_alloc(struct mm_struct *mm, pud_t *pud, |
| 812 | unsigned long address) |
| 813 | { |
| 814 | return 0; |
| 815 | } |
| 816 | #else |
Hugh Dickins | 1bb3630 | 2005-10-29 18:16:22 -0700 | [diff] [blame] | 817 | int __pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address); |
Nick Piggin | 5f22df0 | 2007-05-06 14:49:02 -0700 | [diff] [blame] | 818 | #endif |
| 819 | |
Hugh Dickins | 1bb3630 | 2005-10-29 18:16:22 -0700 | [diff] [blame] | 820 | int __pte_alloc(struct mm_struct *mm, pmd_t *pmd, unsigned long address); |
| 821 | int __pte_alloc_kernel(pmd_t *pmd, unsigned long address); |
| 822 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 823 | /* |
| 824 | * The following ifdef needed to get the 4level-fixup.h header to work. |
| 825 | * Remove it when 4level-fixup.h has been removed. |
| 826 | */ |
Hugh Dickins | 1bb3630 | 2005-10-29 18:16:22 -0700 | [diff] [blame] | 827 | #if defined(CONFIG_MMU) && !defined(__ARCH_HAS_4LEVEL_HACK) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 828 | static inline pud_t *pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address) |
| 829 | { |
Hugh Dickins | 1bb3630 | 2005-10-29 18:16:22 -0700 | [diff] [blame] | 830 | return (unlikely(pgd_none(*pgd)) && __pud_alloc(mm, pgd, address))? |
| 831 | NULL: pud_offset(pgd, address); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 832 | } |
| 833 | |
| 834 | static inline pmd_t *pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address) |
| 835 | { |
Hugh Dickins | 1bb3630 | 2005-10-29 18:16:22 -0700 | [diff] [blame] | 836 | return (unlikely(pud_none(*pud)) && __pmd_alloc(mm, pud, address))? |
| 837 | NULL: pmd_offset(pud, address); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 838 | } |
Hugh Dickins | 1bb3630 | 2005-10-29 18:16:22 -0700 | [diff] [blame] | 839 | #endif /* CONFIG_MMU && !__ARCH_HAS_4LEVEL_HACK */ |
| 840 | |
Hugh Dickins | 4c21e2f | 2005-10-29 18:16:40 -0700 | [diff] [blame] | 841 | #if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS |
| 842 | /* |
| 843 | * We tuck a spinlock to guard each pagetable page into its struct page, |
| 844 | * at page->private, with BUILD_BUG_ON to make sure that this will not |
| 845 | * overflow into the next struct page (as it might with DEBUG_SPINLOCK). |
| 846 | * When freeing, reset page->mapping so free_pages_check won't complain. |
| 847 | */ |
Andrew Morton | 349aef0 | 2006-01-08 01:04:36 -0800 | [diff] [blame] | 848 | #define __pte_lockptr(page) &((page)->ptl) |
Hugh Dickins | 4c21e2f | 2005-10-29 18:16:40 -0700 | [diff] [blame] | 849 | #define pte_lock_init(_page) do { \ |
| 850 | spin_lock_init(__pte_lockptr(_page)); \ |
| 851 | } while (0) |
| 852 | #define pte_lock_deinit(page) ((page)->mapping = NULL) |
| 853 | #define pte_lockptr(mm, pmd) ({(void)(mm); __pte_lockptr(pmd_page(*(pmd)));}) |
| 854 | #else |
| 855 | /* |
| 856 | * We use mm->page_table_lock to guard all pagetable pages of the mm. |
| 857 | */ |
| 858 | #define pte_lock_init(page) do {} while (0) |
| 859 | #define pte_lock_deinit(page) do {} while (0) |
| 860 | #define pte_lockptr(mm, pmd) ({(void)(pmd); &(mm)->page_table_lock;}) |
| 861 | #endif /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */ |
| 862 | |
Hugh Dickins | c74df32 | 2005-10-29 18:16:23 -0700 | [diff] [blame] | 863 | #define pte_offset_map_lock(mm, pmd, address, ptlp) \ |
| 864 | ({ \ |
Hugh Dickins | 4c21e2f | 2005-10-29 18:16:40 -0700 | [diff] [blame] | 865 | spinlock_t *__ptl = pte_lockptr(mm, pmd); \ |
Hugh Dickins | c74df32 | 2005-10-29 18:16:23 -0700 | [diff] [blame] | 866 | pte_t *__pte = pte_offset_map(pmd, address); \ |
| 867 | *(ptlp) = __ptl; \ |
| 868 | spin_lock(__ptl); \ |
| 869 | __pte; \ |
| 870 | }) |
| 871 | |
| 872 | #define pte_unmap_unlock(pte, ptl) do { \ |
| 873 | spin_unlock(ptl); \ |
| 874 | pte_unmap(pte); \ |
| 875 | } while (0) |
| 876 | |
Hugh Dickins | 1bb3630 | 2005-10-29 18:16:22 -0700 | [diff] [blame] | 877 | #define pte_alloc_map(mm, pmd, address) \ |
| 878 | ((unlikely(!pmd_present(*(pmd))) && __pte_alloc(mm, pmd, address))? \ |
| 879 | NULL: pte_offset_map(pmd, address)) |
| 880 | |
Hugh Dickins | c74df32 | 2005-10-29 18:16:23 -0700 | [diff] [blame] | 881 | #define pte_alloc_map_lock(mm, pmd, address, ptlp) \ |
| 882 | ((unlikely(!pmd_present(*(pmd))) && __pte_alloc(mm, pmd, address))? \ |
| 883 | NULL: pte_offset_map_lock(mm, pmd, address, ptlp)) |
| 884 | |
Hugh Dickins | 1bb3630 | 2005-10-29 18:16:22 -0700 | [diff] [blame] | 885 | #define pte_alloc_kernel(pmd, address) \ |
| 886 | ((unlikely(!pmd_present(*(pmd))) && __pte_alloc_kernel(pmd, address))? \ |
| 887 | NULL: pte_offset_kernel(pmd, address)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 888 | |
| 889 | extern void free_area_init(unsigned long * zones_size); |
| 890 | extern void free_area_init_node(int nid, pg_data_t *pgdat, |
| 891 | unsigned long * zones_size, unsigned long zone_start_pfn, |
| 892 | unsigned long *zholes_size); |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 893 | #ifdef CONFIG_ARCH_POPULATES_NODE_MAP |
| 894 | /* |
| 895 | * With CONFIG_ARCH_POPULATES_NODE_MAP set, an architecture may initialise its |
| 896 | * zones, allocate the backing mem_map and account for memory holes in a more |
| 897 | * architecture independent manner. This is a substitute for creating the |
| 898 | * zone_sizes[] and zholes_size[] arrays and passing them to |
| 899 | * free_area_init_node() |
| 900 | * |
| 901 | * An architecture is expected to register range of page frames backed by |
| 902 | * physical memory with add_active_range() before calling |
| 903 | * free_area_init_nodes() passing in the PFN each zone ends at. At a basic |
| 904 | * usage, an architecture is expected to do something like |
| 905 | * |
| 906 | * unsigned long max_zone_pfns[MAX_NR_ZONES] = {max_dma, max_normal_pfn, |
| 907 | * max_highmem_pfn}; |
| 908 | * for_each_valid_physical_page_range() |
| 909 | * add_active_range(node_id, start_pfn, end_pfn) |
| 910 | * free_area_init_nodes(max_zone_pfns); |
| 911 | * |
| 912 | * If the architecture guarantees that there are no holes in the ranges |
| 913 | * registered with add_active_range(), free_bootmem_active_regions() |
| 914 | * will call free_bootmem_node() for each registered physical page range. |
| 915 | * Similarly sparse_memory_present_with_active_regions() calls |
| 916 | * memory_present() for each range when SPARSEMEM is enabled. |
| 917 | * |
| 918 | * See mm/page_alloc.c for more information on each function exposed by |
| 919 | * CONFIG_ARCH_POPULATES_NODE_MAP |
| 920 | */ |
| 921 | extern void free_area_init_nodes(unsigned long *max_zone_pfn); |
| 922 | extern void add_active_range(unsigned int nid, unsigned long start_pfn, |
| 923 | unsigned long end_pfn); |
| 924 | extern void shrink_active_range(unsigned int nid, unsigned long old_end_pfn, |
| 925 | unsigned long new_end_pfn); |
Mel Gorman | fb01439 | 2006-09-27 01:49:59 -0700 | [diff] [blame] | 926 | extern void push_node_boundaries(unsigned int nid, unsigned long start_pfn, |
| 927 | unsigned long end_pfn); |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 928 | extern void remove_all_active_ranges(void); |
| 929 | extern unsigned long absent_pages_in_range(unsigned long start_pfn, |
| 930 | unsigned long end_pfn); |
| 931 | extern void get_pfn_range_for_nid(unsigned int nid, |
| 932 | unsigned long *start_pfn, unsigned long *end_pfn); |
| 933 | extern unsigned long find_min_pfn_with_active_regions(void); |
| 934 | extern unsigned long find_max_pfn_with_active_regions(void); |
| 935 | extern void free_bootmem_with_active_regions(int nid, |
| 936 | unsigned long max_low_pfn); |
| 937 | extern void sparse_memory_present_with_active_regions(int nid); |
| 938 | #ifndef CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID |
| 939 | extern int early_pfn_to_nid(unsigned long pfn); |
| 940 | #endif /* CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID */ |
| 941 | #endif /* CONFIG_ARCH_POPULATES_NODE_MAP */ |
Mel Gorman | 0e0b864 | 2006-09-27 01:49:56 -0700 | [diff] [blame] | 942 | extern void set_dma_reserve(unsigned long new_dma_reserve); |
Dave Hansen | a2f3aa0 | 2007-01-10 23:15:30 -0800 | [diff] [blame] | 943 | extern void memmap_init_zone(unsigned long, int, unsigned long, |
| 944 | unsigned long, enum memmap_context); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 945 | extern void setup_per_zone_pages_min(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 946 | extern void mem_init(void); |
| 947 | extern void show_mem(void); |
| 948 | extern void si_meminfo(struct sysinfo * val); |
| 949 | extern void si_meminfo_node(struct sysinfo *val, int nid); |
| 950 | |
Christoph Lameter | e7c8d5c | 2005-06-21 17:14:47 -0700 | [diff] [blame] | 951 | #ifdef CONFIG_NUMA |
| 952 | extern void setup_per_cpu_pageset(void); |
| 953 | #else |
| 954 | static inline void setup_per_cpu_pageset(void) {} |
| 955 | #endif |
| 956 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 957 | /* prio_tree.c */ |
| 958 | void vma_prio_tree_add(struct vm_area_struct *, struct vm_area_struct *old); |
| 959 | void vma_prio_tree_insert(struct vm_area_struct *, struct prio_tree_root *); |
| 960 | void vma_prio_tree_remove(struct vm_area_struct *, struct prio_tree_root *); |
| 961 | struct vm_area_struct *vma_prio_tree_next(struct vm_area_struct *vma, |
| 962 | struct prio_tree_iter *iter); |
| 963 | |
| 964 | #define vma_prio_tree_foreach(vma, iter, root, begin, end) \ |
| 965 | for (prio_tree_iter_init(iter, root, begin, end), vma = NULL; \ |
| 966 | (vma = vma_prio_tree_next(vma, iter)); ) |
| 967 | |
| 968 | static inline void vma_nonlinear_insert(struct vm_area_struct *vma, |
| 969 | struct list_head *list) |
| 970 | { |
| 971 | vma->shared.vm_set.parent = NULL; |
| 972 | list_add_tail(&vma->shared.vm_set.list, list); |
| 973 | } |
| 974 | |
| 975 | /* mmap.c */ |
Alan Cox | 34b4e4a | 2007-08-22 14:01:28 -0700 | [diff] [blame] | 976 | extern int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 977 | extern void vma_adjust(struct vm_area_struct *vma, unsigned long start, |
| 978 | unsigned long end, pgoff_t pgoff, struct vm_area_struct *insert); |
| 979 | extern struct vm_area_struct *vma_merge(struct mm_struct *, |
| 980 | struct vm_area_struct *prev, unsigned long addr, unsigned long end, |
| 981 | unsigned long vm_flags, struct anon_vma *, struct file *, pgoff_t, |
| 982 | struct mempolicy *); |
| 983 | extern struct anon_vma *find_mergeable_anon_vma(struct vm_area_struct *); |
| 984 | extern int split_vma(struct mm_struct *, |
| 985 | struct vm_area_struct *, unsigned long addr, int new_below); |
| 986 | extern int insert_vm_struct(struct mm_struct *, struct vm_area_struct *); |
| 987 | extern void __vma_link_rb(struct mm_struct *, struct vm_area_struct *, |
| 988 | struct rb_node **, struct rb_node *); |
Hugh Dickins | a8fb561 | 2005-10-29 18:15:57 -0700 | [diff] [blame] | 989 | extern void unlink_file_vma(struct vm_area_struct *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 990 | extern struct vm_area_struct *copy_vma(struct vm_area_struct **, |
| 991 | unsigned long addr, unsigned long len, pgoff_t pgoff); |
| 992 | extern void exit_mmap(struct mm_struct *); |
akpm@osdl.org | 119f657 | 2005-05-01 08:58:35 -0700 | [diff] [blame] | 993 | extern int may_expand_vm(struct mm_struct *mm, unsigned long npages); |
Roland McGrath | fa5dc22 | 2007-02-08 14:20:41 -0800 | [diff] [blame] | 994 | extern int install_special_mapping(struct mm_struct *mm, |
| 995 | unsigned long addr, unsigned long len, |
| 996 | unsigned long flags, struct page **pages); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 997 | |
| 998 | extern unsigned long get_unmapped_area(struct file *, unsigned long, unsigned long, unsigned long, unsigned long); |
| 999 | |
| 1000 | extern unsigned long do_mmap_pgoff(struct file *file, unsigned long addr, |
| 1001 | unsigned long len, unsigned long prot, |
| 1002 | unsigned long flag, unsigned long pgoff); |
Miklos Szeredi | 0165ab4 | 2007-07-15 23:38:26 -0700 | [diff] [blame] | 1003 | extern unsigned long mmap_region(struct file *file, unsigned long addr, |
| 1004 | unsigned long len, unsigned long flags, |
| 1005 | unsigned int vm_flags, unsigned long pgoff, |
| 1006 | int accountable); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1007 | |
| 1008 | static inline unsigned long do_mmap(struct file *file, unsigned long addr, |
| 1009 | unsigned long len, unsigned long prot, |
| 1010 | unsigned long flag, unsigned long offset) |
| 1011 | { |
| 1012 | unsigned long ret = -EINVAL; |
| 1013 | if ((offset + PAGE_ALIGN(len)) < offset) |
| 1014 | goto out; |
| 1015 | if (!(offset & ~PAGE_MASK)) |
| 1016 | ret = do_mmap_pgoff(file, addr, len, prot, flag, offset >> PAGE_SHIFT); |
| 1017 | out: |
| 1018 | return ret; |
| 1019 | } |
| 1020 | |
| 1021 | extern int do_munmap(struct mm_struct *, unsigned long, size_t); |
| 1022 | |
| 1023 | extern unsigned long do_brk(unsigned long, unsigned long); |
| 1024 | |
| 1025 | /* filemap.c */ |
| 1026 | extern unsigned long page_unuse(struct page *); |
| 1027 | extern void truncate_inode_pages(struct address_space *, loff_t); |
Hans Reiser | d733907 | 2006-01-06 00:10:36 -0800 | [diff] [blame] | 1028 | extern void truncate_inode_pages_range(struct address_space *, |
| 1029 | loff_t lstart, loff_t lend); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1030 | |
| 1031 | /* generic vm_area_ops exported for stackable file systems */ |
Nick Piggin | d0217ac | 2007-07-19 01:47:03 -0700 | [diff] [blame] | 1032 | extern int filemap_fault(struct vm_area_struct *, struct vm_fault *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1033 | |
| 1034 | /* mm/page-writeback.c */ |
| 1035 | int write_one_page(struct page *page, int wait); |
| 1036 | |
| 1037 | /* readahead.c */ |
| 1038 | #define VM_MAX_READAHEAD 128 /* kbytes */ |
| 1039 | #define VM_MIN_READAHEAD 16 /* kbytes (includes current page) */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1040 | |
| 1041 | int do_page_cache_readahead(struct address_space *mapping, struct file *filp, |
Andrew Morton | 7361f4d | 2005-11-07 00:59:28 -0800 | [diff] [blame] | 1042 | pgoff_t offset, unsigned long nr_to_read); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1043 | int force_page_cache_readahead(struct address_space *mapping, struct file *filp, |
Andrew Morton | 7361f4d | 2005-11-07 00:59:28 -0800 | [diff] [blame] | 1044 | pgoff_t offset, unsigned long nr_to_read); |
Rusty Russell | cf914a7 | 2007-07-19 01:48:08 -0700 | [diff] [blame] | 1045 | |
| 1046 | void page_cache_sync_readahead(struct address_space *mapping, |
| 1047 | struct file_ra_state *ra, |
| 1048 | struct file *filp, |
| 1049 | pgoff_t offset, |
| 1050 | unsigned long size); |
| 1051 | |
| 1052 | void page_cache_async_readahead(struct address_space *mapping, |
| 1053 | struct file_ra_state *ra, |
| 1054 | struct file *filp, |
| 1055 | struct page *pg, |
| 1056 | pgoff_t offset, |
| 1057 | unsigned long size); |
| 1058 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1059 | unsigned long max_sane_readahead(unsigned long nr); |
| 1060 | |
| 1061 | /* Do stack extension */ |
Hugh Dickins | 46dea3d | 2005-10-29 18:16:20 -0700 | [diff] [blame] | 1062 | extern int expand_stack(struct vm_area_struct *vma, unsigned long address); |
Matthew Wilcox | 9ab8851 | 2005-11-18 16:16:42 -0500 | [diff] [blame] | 1063 | #ifdef CONFIG_IA64 |
Hugh Dickins | 46dea3d | 2005-10-29 18:16:20 -0700 | [diff] [blame] | 1064 | extern int expand_upwards(struct vm_area_struct *vma, unsigned long address); |
Matthew Wilcox | 9ab8851 | 2005-11-18 16:16:42 -0500 | [diff] [blame] | 1065 | #endif |
Ollie Wild | b6a2fea | 2007-07-19 01:48:16 -0700 | [diff] [blame] | 1066 | extern int expand_stack_downwards(struct vm_area_struct *vma, |
| 1067 | unsigned long address); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1068 | |
| 1069 | /* Look up the first VMA which satisfies addr < vm_end, NULL if none. */ |
| 1070 | extern struct vm_area_struct * find_vma(struct mm_struct * mm, unsigned long addr); |
| 1071 | extern struct vm_area_struct * find_vma_prev(struct mm_struct * mm, unsigned long addr, |
| 1072 | struct vm_area_struct **pprev); |
| 1073 | |
| 1074 | /* Look up the first VMA which intersects the interval start_addr..end_addr-1, |
| 1075 | NULL if none. Assume start_addr < end_addr. */ |
| 1076 | static inline struct vm_area_struct * find_vma_intersection(struct mm_struct * mm, unsigned long start_addr, unsigned long end_addr) |
| 1077 | { |
| 1078 | struct vm_area_struct * vma = find_vma(mm,start_addr); |
| 1079 | |
| 1080 | if (vma && end_addr <= vma->vm_start) |
| 1081 | vma = NULL; |
| 1082 | return vma; |
| 1083 | } |
| 1084 | |
| 1085 | static inline unsigned long vma_pages(struct vm_area_struct *vma) |
| 1086 | { |
| 1087 | return (vma->vm_end - vma->vm_start) >> PAGE_SHIFT; |
| 1088 | } |
| 1089 | |
Hugh Dickins | 804af2c | 2006-07-26 21:39:49 +0100 | [diff] [blame] | 1090 | pgprot_t vm_get_page_prot(unsigned long vm_flags); |
Hugh Dickins | deceb6c | 2005-10-29 18:16:33 -0700 | [diff] [blame] | 1091 | struct vm_area_struct *find_extend_vma(struct mm_struct *, unsigned long addr); |
| 1092 | struct page *vmalloc_to_page(void *addr); |
| 1093 | unsigned long vmalloc_to_pfn(void *addr); |
| 1094 | int remap_pfn_range(struct vm_area_struct *, unsigned long addr, |
| 1095 | unsigned long pfn, unsigned long size, pgprot_t); |
Linus Torvalds | a145dd4 | 2005-11-30 09:35:19 -0800 | [diff] [blame] | 1096 | int vm_insert_page(struct vm_area_struct *, unsigned long addr, struct page *); |
Nick Piggin | e0dc0d8 | 2007-02-12 00:51:36 -0800 | [diff] [blame] | 1097 | int vm_insert_pfn(struct vm_area_struct *vma, unsigned long addr, |
| 1098 | unsigned long pfn); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1099 | |
Linus Torvalds | 6aab341 | 2005-11-28 14:34:23 -0800 | [diff] [blame] | 1100 | struct page *follow_page(struct vm_area_struct *, unsigned long address, |
Hugh Dickins | deceb6c | 2005-10-29 18:16:33 -0700 | [diff] [blame] | 1101 | unsigned int foll_flags); |
| 1102 | #define FOLL_WRITE 0x01 /* check pte is writable */ |
| 1103 | #define FOLL_TOUCH 0x02 /* mark page accessed */ |
| 1104 | #define FOLL_GET 0x04 /* do get_page on page */ |
| 1105 | #define FOLL_ANON 0x08 /* give ZERO_PAGE if no pgtable */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1106 | |
Jeremy Fitzhardinge | aee16b3 | 2007-05-06 14:48:54 -0700 | [diff] [blame] | 1107 | typedef int (*pte_fn_t)(pte_t *pte, struct page *pmd_page, unsigned long addr, |
| 1108 | void *data); |
| 1109 | extern int apply_to_page_range(struct mm_struct *mm, unsigned long address, |
| 1110 | unsigned long size, pte_fn_t fn, void *data); |
| 1111 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1112 | #ifdef CONFIG_PROC_FS |
Hugh Dickins | ab50b8e | 2005-10-29 18:15:56 -0700 | [diff] [blame] | 1113 | void vm_stat_account(struct mm_struct *, unsigned long, struct file *, long); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1114 | #else |
Hugh Dickins | ab50b8e | 2005-10-29 18:15:56 -0700 | [diff] [blame] | 1115 | static inline void vm_stat_account(struct mm_struct *mm, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1116 | unsigned long flags, struct file *file, long pages) |
| 1117 | { |
| 1118 | } |
| 1119 | #endif /* CONFIG_PROC_FS */ |
| 1120 | |
Ingo Molnar | 12d6f21 | 2008-01-30 13:33:58 +0100 | [diff] [blame] | 1121 | #ifdef CONFIG_DEBUG_PAGEALLOC |
| 1122 | extern int debug_pagealloc_enabled; |
| 1123 | |
| 1124 | extern void kernel_map_pages(struct page *page, int numpages, int enable); |
| 1125 | |
| 1126 | static inline void enable_debug_pagealloc(void) |
| 1127 | { |
| 1128 | debug_pagealloc_enabled = 1; |
| 1129 | } |
| 1130 | #else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1131 | static inline void |
Nick Piggin | 9858db5 | 2006-10-11 01:21:30 -0700 | [diff] [blame] | 1132 | kernel_map_pages(struct page *page, int numpages, int enable) {} |
Ingo Molnar | 12d6f21 | 2008-01-30 13:33:58 +0100 | [diff] [blame] | 1133 | static inline void enable_debug_pagealloc(void) |
| 1134 | { |
| 1135 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1136 | #endif |
| 1137 | |
| 1138 | extern struct vm_area_struct *get_gate_vma(struct task_struct *tsk); |
| 1139 | #ifdef __HAVE_ARCH_GATE_AREA |
| 1140 | int in_gate_area_no_task(unsigned long addr); |
| 1141 | int in_gate_area(struct task_struct *task, unsigned long addr); |
| 1142 | #else |
| 1143 | int in_gate_area_no_task(unsigned long addr); |
| 1144 | #define in_gate_area(task, addr) ({(void)task; in_gate_area_no_task(addr);}) |
| 1145 | #endif /* __HAVE_ARCH_GATE_AREA */ |
| 1146 | |
Andrew Morton | 9d0243b | 2006-01-08 01:00:39 -0800 | [diff] [blame] | 1147 | int drop_caches_sysctl_handler(struct ctl_table *, int, struct file *, |
| 1148 | void __user *, size_t *, loff_t *); |
Andrew Morton | 69e0594 | 2006-03-22 00:08:19 -0800 | [diff] [blame] | 1149 | unsigned long shrink_slab(unsigned long scanned, gfp_t gfp_mask, |
Andrew Morton | 9d0243b | 2006-01-08 01:00:39 -0800 | [diff] [blame] | 1150 | unsigned long lru_pages); |
| 1151 | void drop_pagecache(void); |
| 1152 | void drop_slab(void); |
| 1153 | |
Luke Yang | 7a9166e | 2006-02-20 18:28:07 -0800 | [diff] [blame] | 1154 | #ifndef CONFIG_MMU |
| 1155 | #define randomize_va_space 0 |
| 1156 | #else |
Andi Kleen | a62eaf1 | 2006-02-16 23:41:58 +0100 | [diff] [blame] | 1157 | extern int randomize_va_space; |
Luke Yang | 7a9166e | 2006-02-20 18:28:07 -0800 | [diff] [blame] | 1158 | #endif |
Andi Kleen | a62eaf1 | 2006-02-16 23:41:58 +0100 | [diff] [blame] | 1159 | |
Sam Ravnborg | 045e72a | 2007-07-26 10:41:13 -0700 | [diff] [blame] | 1160 | const char * arch_vma_name(struct vm_area_struct *vma); |
Andi Kleen | 0325291 | 2008-01-30 13:33:18 +0100 | [diff] [blame] | 1161 | void print_vma_addr(char *prefix, unsigned long rip); |
Ingo Molnar | e6e5494 | 2006-06-27 02:53:50 -0700 | [diff] [blame] | 1162 | |
Yasunori Goto | 98f3cfc | 2007-10-16 01:26:14 -0700 | [diff] [blame] | 1163 | struct page *sparse_mem_map_populate(unsigned long pnum, int nid); |
Andy Whitcroft | 29c7111 | 2007-10-16 01:24:14 -0700 | [diff] [blame] | 1164 | pgd_t *vmemmap_pgd_populate(unsigned long addr, int node); |
| 1165 | pud_t *vmemmap_pud_populate(pgd_t *pgd, unsigned long addr, int node); |
| 1166 | pmd_t *vmemmap_pmd_populate(pud_t *pud, unsigned long addr, int node); |
| 1167 | pte_t *vmemmap_pte_populate(pmd_t *pmd, unsigned long addr, int node); |
Christoph Lameter | 8f6aac4 | 2007-10-16 01:24:13 -0700 | [diff] [blame] | 1168 | void *vmemmap_alloc_block(unsigned long size, int node); |
| 1169 | void vmemmap_verify(pte_t *, int, unsigned long, unsigned long); |
Andy Whitcroft | 29c7111 | 2007-10-16 01:24:14 -0700 | [diff] [blame] | 1170 | int vmemmap_populate_basepages(struct page *start_page, |
| 1171 | unsigned long pages, int node); |
| 1172 | int vmemmap_populate(struct page *start_page, unsigned long pages, int node); |
Christoph Lameter | 8f6aac4 | 2007-10-16 01:24:13 -0700 | [diff] [blame] | 1173 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1174 | #endif /* __KERNEL__ */ |
| 1175 | #endif /* _LINUX_MM_H */ |