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> |
Jiri Slaby | 59ea746 | 2008-06-12 13:56:40 +0200 | [diff] [blame] | 10 | #include <linux/mmdebug.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | #include <linux/mmzone.h> |
| 12 | #include <linux/rbtree.h> |
| 13 | #include <linux/prio_tree.h> |
Ingo Molnar | 9a11b49a | 2006-07-03 00:24:33 -0700 | [diff] [blame] | 14 | #include <linux/debug_locks.h> |
Heiko Carstens | 5b99cd0 | 2006-09-27 01:50:01 -0700 | [diff] [blame] | 15 | #include <linux/mm_types.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | |
| 17 | struct mempolicy; |
| 18 | struct anon_vma; |
Alexey Dobriyan | 4e950f6 | 2007-07-30 02:36:13 +0400 | [diff] [blame] | 19 | struct file_ra_state; |
Alexey Dobriyan | e8edc6e | 2007-05-21 01:22:52 +0400 | [diff] [blame] | 20 | struct user_struct; |
Alexey Dobriyan | 4e950f6 | 2007-07-30 02:36:13 +0400 | [diff] [blame] | 21 | struct writeback_control; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | |
| 23 | #ifndef CONFIG_DISCONTIGMEM /* Don't use mapnrs, do it properly */ |
| 24 | extern unsigned long max_mapnr; |
| 25 | #endif |
| 26 | |
| 27 | extern unsigned long num_physpages; |
| 28 | extern void * high_memory; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | extern int page_cluster; |
| 30 | |
| 31 | #ifdef CONFIG_SYSCTL |
| 32 | extern int sysctl_legacy_va_layout; |
| 33 | #else |
| 34 | #define sysctl_legacy_va_layout 0 |
| 35 | #endif |
| 36 | |
James Morris | 42d7896 | 2007-12-26 15:12:37 +1100 | [diff] [blame] | 37 | extern unsigned long mmap_min_addr; |
| 38 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | #include <asm/page.h> |
| 40 | #include <asm/pgtable.h> |
| 41 | #include <asm/processor.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | #define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n)) |
| 44 | |
Andrea Righi | 27ac792 | 2008-07-23 21:28:13 -0700 | [diff] [blame] | 45 | /* to align the pointer to the (next) page boundary */ |
| 46 | #define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE) |
| 47 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | /* |
| 49 | * Linux kernel virtual memory manager primitives. |
| 50 | * The idea being to have a "virtual" mm in the same way |
| 51 | * we have a virtual fs - giving a cleaner interface to the |
| 52 | * mm details, and allowing different kinds of memory mappings |
| 53 | * (from shared memory to executable loading to arbitrary |
| 54 | * mmap() functions). |
| 55 | */ |
| 56 | |
Christoph Lameter | c43692e | 2006-12-06 20:32:48 -0800 | [diff] [blame] | 57 | extern struct kmem_cache *vm_area_cachep; |
| 58 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | /* |
| 60 | * This struct defines the per-mm list of VMAs for uClinux. If CONFIG_MMU is |
| 61 | * disabled, then there's a single shared list of VMAs maintained by the |
| 62 | * system, and mm's subscribe to these individually |
| 63 | */ |
| 64 | struct vm_list_struct { |
| 65 | struct vm_list_struct *next; |
| 66 | struct vm_area_struct *vma; |
| 67 | }; |
| 68 | |
| 69 | #ifndef CONFIG_MMU |
| 70 | extern struct rb_root nommu_vma_tree; |
| 71 | extern struct rw_semaphore nommu_vma_sem; |
| 72 | |
| 73 | extern unsigned int kobjsize(const void *objp); |
| 74 | #endif |
| 75 | |
| 76 | /* |
Hugh Dickins | 605d928 | 2008-08-16 11:07:21 +0100 | [diff] [blame] | 77 | * vm_flags in vm_area_struct, see mm_types.h. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | */ |
| 79 | #define VM_READ 0x00000001 /* currently active flags */ |
| 80 | #define VM_WRITE 0x00000002 |
| 81 | #define VM_EXEC 0x00000004 |
| 82 | #define VM_SHARED 0x00000008 |
| 83 | |
Paolo 'Blaisorblade' Giarrusso | 7e2cff4 | 2005-09-21 09:55:39 -0700 | [diff] [blame] | 84 | /* 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] | 85 | #define VM_MAYREAD 0x00000010 /* limits for mprotect() etc */ |
| 86 | #define VM_MAYWRITE 0x00000020 |
| 87 | #define VM_MAYEXEC 0x00000040 |
| 88 | #define VM_MAYSHARE 0x00000080 |
| 89 | |
| 90 | #define VM_GROWSDOWN 0x00000100 /* general info on the segment */ |
| 91 | #define VM_GROWSUP 0x00000200 |
Linus Torvalds | 6aab341 | 2005-11-28 14:34:23 -0800 | [diff] [blame] | 92 | #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] | 93 | #define VM_DENYWRITE 0x00000800 /* ETXTBSY on write attempts.. */ |
| 94 | |
| 95 | #define VM_EXECUTABLE 0x00001000 |
| 96 | #define VM_LOCKED 0x00002000 |
| 97 | #define VM_IO 0x00004000 /* Memory mapped I/O or similar */ |
| 98 | |
| 99 | /* Used by sys_madvise() */ |
| 100 | #define VM_SEQ_READ 0x00008000 /* App will access data sequentially */ |
| 101 | #define VM_RAND_READ 0x00010000 /* App will not benefit from clustered reads */ |
| 102 | |
| 103 | #define VM_DONTCOPY 0x00020000 /* Do not copy this vma on fork */ |
| 104 | #define VM_DONTEXPAND 0x00040000 /* Cannot expand with mremap() */ |
Hugh Dickins | 0b14c17 | 2005-11-21 21:32:15 -0800 | [diff] [blame] | 105 | #define VM_RESERVED 0x00080000 /* Count as reserved_vm like IO */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | #define VM_ACCOUNT 0x00100000 /* Is a VM accounted object */ |
Andy Whitcroft | cdfd432 | 2008-07-23 21:27:28 -0700 | [diff] [blame] | 107 | #define VM_NORESERVE 0x00200000 /* should the VM suppress accounting */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | #define VM_HUGETLB 0x00400000 /* Huge TLB Page VM */ |
| 109 | #define VM_NONLINEAR 0x00800000 /* Is non-linear (remap_file_pages) */ |
| 110 | #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] | 111 | #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] | 112 | #define VM_ALWAYSDUMP 0x04000000 /* Always include in core dumps */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | |
Nick Piggin | d0217ac | 2007-07-19 01:47:03 -0700 | [diff] [blame] | 114 | #define VM_CAN_NONLINEAR 0x08000000 /* Has ->fault & does nonlinear pages */ |
Jared Hulbert | b379d79 | 2008-04-28 02:12:58 -0700 | [diff] [blame] | 115 | #define VM_MIXEDMAP 0x10000000 /* Can contain "struct page" and pure PFN pages */ |
Dave Kleikamp | aba46c5 | 2008-07-08 00:28:52 +1000 | [diff] [blame] | 116 | #define VM_SAO 0x20000000 /* Strong Access Ordering (powerpc) */ |
Nick Piggin | d00806b | 2007-07-19 01:46:57 -0700 | [diff] [blame] | 117 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | #ifndef VM_STACK_DEFAULT_FLAGS /* arch can override this */ |
| 119 | #define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS |
| 120 | #endif |
| 121 | |
| 122 | #ifdef CONFIG_STACK_GROWSUP |
| 123 | #define VM_STACK_FLAGS (VM_GROWSUP | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT) |
| 124 | #else |
| 125 | #define VM_STACK_FLAGS (VM_GROWSDOWN | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT) |
| 126 | #endif |
| 127 | |
| 128 | #define VM_READHINTMASK (VM_SEQ_READ | VM_RAND_READ) |
| 129 | #define VM_ClearReadHint(v) (v)->vm_flags &= ~VM_READHINTMASK |
| 130 | #define VM_NormalReadHint(v) (!((v)->vm_flags & VM_READHINTMASK)) |
| 131 | #define VM_SequentialReadHint(v) ((v)->vm_flags & VM_SEQ_READ) |
| 132 | #define VM_RandomReadHint(v) ((v)->vm_flags & VM_RAND_READ) |
| 133 | |
| 134 | /* |
Nick Piggin | b291f00 | 2008-10-18 20:26:44 -0700 | [diff] [blame] | 135 | * special vmas that are non-mergable, non-mlock()able |
| 136 | */ |
| 137 | #define VM_SPECIAL (VM_IO | VM_DONTEXPAND | VM_RESERVED | VM_PFNMAP) |
| 138 | |
| 139 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | * mapping from the currently active vm_flags protection bits (the |
| 141 | * low four bits) to a page protection mask.. |
| 142 | */ |
| 143 | extern pgprot_t protection_map[16]; |
| 144 | |
Nick Piggin | d0217ac | 2007-07-19 01:47:03 -0700 | [diff] [blame] | 145 | #define FAULT_FLAG_WRITE 0x01 /* Fault was a write access */ |
| 146 | #define FAULT_FLAG_NONLINEAR 0x02 /* Fault was via a nonlinear mapping */ |
| 147 | |
venkatesh.pallipadi@intel.com | 6bd9cd5 | 2008-12-19 13:47:26 -0800 | [diff] [blame^] | 148 | /* |
| 149 | * This interface is used by x86 PAT code to identify a pfn mapping that is |
| 150 | * linear over entire vma. This is to optimize PAT code that deals with |
| 151 | * marking the physical region with a particular prot. This is not for generic |
| 152 | * mm use. Note also that this check will not work if the pfn mapping is |
| 153 | * linear for a vma starting at physical address 0. In which case PAT code |
| 154 | * falls back to slow path of reserving physical range page by page. |
| 155 | */ |
venkatesh.pallipadi@intel.com | 3c8bb73 | 2008-12-18 11:41:27 -0800 | [diff] [blame] | 156 | static inline int is_linear_pfn_mapping(struct vm_area_struct *vma) |
| 157 | { |
| 158 | return ((vma->vm_flags & VM_PFNMAP) && vma->vm_pgoff); |
| 159 | } |
| 160 | |
| 161 | static inline int is_pfn_mapping(struct vm_area_struct *vma) |
| 162 | { |
| 163 | return (vma->vm_flags & VM_PFNMAP); |
| 164 | } |
Nick Piggin | d0217ac | 2007-07-19 01:47:03 -0700 | [diff] [blame] | 165 | |
venkatesh.pallipadi@intel.com | 2ab6403 | 2008-12-18 11:41:29 -0800 | [diff] [blame] | 166 | extern int track_pfn_vma_new(struct vm_area_struct *vma, pgprot_t prot, |
| 167 | unsigned long pfn, unsigned long size); |
| 168 | extern int track_pfn_vma_copy(struct vm_area_struct *vma); |
| 169 | extern void untrack_pfn_vma(struct vm_area_struct *vma, unsigned long pfn, |
| 170 | unsigned long size); |
| 171 | |
Nick Piggin | 54cb882 | 2007-07-19 01:46:59 -0700 | [diff] [blame] | 172 | /* |
Nick Piggin | d0217ac | 2007-07-19 01:47:03 -0700 | [diff] [blame] | 173 | * 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] | 174 | * ->fault function. The vma's ->fault is responsible for returning a bitmask |
| 175 | * 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] | 176 | * |
Nick Piggin | d0217ac | 2007-07-19 01:47:03 -0700 | [diff] [blame] | 177 | * pgoff should be used in favour of virtual_address, if possible. If pgoff |
| 178 | * is used, one may set VM_CAN_NONLINEAR in the vma->vm_flags to get nonlinear |
| 179 | * mapping support. |
Nick Piggin | 54cb882 | 2007-07-19 01:46:59 -0700 | [diff] [blame] | 180 | */ |
Nick Piggin | d0217ac | 2007-07-19 01:47:03 -0700 | [diff] [blame] | 181 | struct vm_fault { |
| 182 | unsigned int flags; /* FAULT_FLAG_xxx flags */ |
| 183 | pgoff_t pgoff; /* Logical page offset based on vma */ |
| 184 | void __user *virtual_address; /* Faulting virtual address */ |
| 185 | |
| 186 | struct page *page; /* ->fault handlers should return a |
Nick Piggin | 83c5407 | 2007-07-19 01:47:05 -0700 | [diff] [blame] | 187 | * page here, unless VM_FAULT_NOPAGE |
Nick Piggin | d0217ac | 2007-07-19 01:47:03 -0700 | [diff] [blame] | 188 | * is set (which is also implied by |
Nick Piggin | 83c5407 | 2007-07-19 01:47:05 -0700 | [diff] [blame] | 189 | * VM_FAULT_ERROR). |
Nick Piggin | d0217ac | 2007-07-19 01:47:03 -0700 | [diff] [blame] | 190 | */ |
Nick Piggin | 54cb882 | 2007-07-19 01:46:59 -0700 | [diff] [blame] | 191 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | |
| 193 | /* |
| 194 | * These are the virtual MM functions - opening of an area, closing and |
| 195 | * unmapping it (needed to keep files on disk up-to-date etc), pointer |
| 196 | * to the functions called when a no-page or a wp-page exception occurs. |
| 197 | */ |
| 198 | struct vm_operations_struct { |
| 199 | void (*open)(struct vm_area_struct * area); |
| 200 | void (*close)(struct vm_area_struct * area); |
Nick Piggin | d0217ac | 2007-07-19 01:47:03 -0700 | [diff] [blame] | 201 | int (*fault)(struct vm_area_struct *vma, struct vm_fault *vmf); |
David Howells | 9637a5e | 2006-06-23 02:03:43 -0700 | [diff] [blame] | 202 | |
| 203 | /* notification that a previously read-only page is about to become |
| 204 | * writable, if an error is returned it will cause a SIGBUS */ |
| 205 | int (*page_mkwrite)(struct vm_area_struct *vma, struct page *page); |
Rik van Riel | 28b2ee2 | 2008-07-23 21:27:05 -0700 | [diff] [blame] | 206 | |
| 207 | /* called by access_process_vm when get_user_pages() fails, typically |
| 208 | * for use by special VMAs that can switch between memory and hardware |
| 209 | */ |
| 210 | int (*access)(struct vm_area_struct *vma, unsigned long addr, |
| 211 | void *buf, int len, int write); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | #ifdef CONFIG_NUMA |
Lee Schermerhorn | a6020ed | 2008-04-28 02:13:14 -0700 | [diff] [blame] | 213 | /* |
| 214 | * set_policy() op must add a reference to any non-NULL @new mempolicy |
| 215 | * to hold the policy upon return. Caller should pass NULL @new to |
| 216 | * remove a policy and fall back to surrounding context--i.e. do not |
| 217 | * install a MPOL_DEFAULT policy, nor the task or system default |
| 218 | * mempolicy. |
| 219 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | int (*set_policy)(struct vm_area_struct *vma, struct mempolicy *new); |
Lee Schermerhorn | a6020ed | 2008-04-28 02:13:14 -0700 | [diff] [blame] | 221 | |
| 222 | /* |
| 223 | * get_policy() op must add reference [mpol_get()] to any policy at |
| 224 | * (vma,addr) marked as MPOL_SHARED. The shared policy infrastructure |
| 225 | * in mm/mempolicy.c will do this automatically. |
| 226 | * get_policy() must NOT add a ref if the policy at (vma,addr) is not |
| 227 | * marked as MPOL_SHARED. vma policies are protected by the mmap_sem. |
| 228 | * If no [shared/vma] mempolicy exists at the addr, get_policy() op |
| 229 | * must return NULL--i.e., do not "fallback" to task or system default |
| 230 | * policy. |
| 231 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | struct mempolicy *(*get_policy)(struct vm_area_struct *vma, |
| 233 | unsigned long addr); |
Christoph Lameter | 7b2259b | 2006-06-25 05:46:48 -0700 | [diff] [blame] | 234 | int (*migrate)(struct vm_area_struct *vma, const nodemask_t *from, |
| 235 | const nodemask_t *to, unsigned long flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | #endif |
| 237 | }; |
| 238 | |
| 239 | struct mmu_gather; |
| 240 | struct inode; |
| 241 | |
Andrew Morton | 349aef0 | 2006-01-08 01:04:36 -0800 | [diff] [blame] | 242 | #define page_private(page) ((page)->private) |
| 243 | #define set_page_private(page, v) ((page)->private = (v)) |
Hugh Dickins | 4c21e2f | 2005-10-29 18:16:40 -0700 | [diff] [blame] | 244 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | /* |
| 246 | * FIXME: take this include out, include page-flags.h in |
| 247 | * files which need it (119 of them) |
| 248 | */ |
| 249 | #include <linux/page-flags.h> |
| 250 | |
| 251 | /* |
| 252 | * Methods to modify the page usage count. |
| 253 | * |
| 254 | * What counts for a page usage: |
| 255 | * - cache mapping (page->mapping) |
| 256 | * - private data (page->private) |
| 257 | * - page mapped in a task's page tables, each mapping |
| 258 | * is counted separately |
| 259 | * |
| 260 | * Also, many kernel routines increase the page count before a critical |
| 261 | * 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] | 262 | */ |
| 263 | |
| 264 | /* |
Nick Piggin | da6052f | 2006-09-25 23:31:35 -0700 | [diff] [blame] | 265 | * 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] | 266 | */ |
Nick Piggin | 7c8ee9a | 2006-03-22 00:08:03 -0800 | [diff] [blame] | 267 | static inline int put_page_testzero(struct page *page) |
| 268 | { |
Nick Piggin | 725d704 | 2006-09-25 23:30:55 -0700 | [diff] [blame] | 269 | VM_BUG_ON(atomic_read(&page->_count) == 0); |
Nick Piggin | 8dc04ef | 2006-03-22 00:08:03 -0800 | [diff] [blame] | 270 | return atomic_dec_and_test(&page->_count); |
Nick Piggin | 7c8ee9a | 2006-03-22 00:08:03 -0800 | [diff] [blame] | 271 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | |
| 273 | /* |
Nick Piggin | 7c8ee9a | 2006-03-22 00:08:03 -0800 | [diff] [blame] | 274 | * Try to grab a ref unless the page has a refcount of zero, return false if |
| 275 | * that is the case. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | */ |
Nick Piggin | 7c8ee9a | 2006-03-22 00:08:03 -0800 | [diff] [blame] | 277 | static inline int get_page_unless_zero(struct page *page) |
| 278 | { |
Christoph Lameter | aec2c3e | 2008-02-04 22:28:35 -0800 | [diff] [blame] | 279 | VM_BUG_ON(PageTail(page)); |
Nick Piggin | 8dc04ef | 2006-03-22 00:08:03 -0800 | [diff] [blame] | 280 | return atomic_inc_not_zero(&page->_count); |
Nick Piggin | 7c8ee9a | 2006-03-22 00:08:03 -0800 | [diff] [blame] | 281 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | |
Christoph Lameter | 48667e7 | 2008-02-04 22:28:31 -0800 | [diff] [blame] | 283 | /* Support for virtually mapped pages */ |
Christoph Lameter | b3bdda0 | 2008-02-04 22:28:32 -0800 | [diff] [blame] | 284 | struct page *vmalloc_to_page(const void *addr); |
| 285 | unsigned long vmalloc_to_pfn(const void *addr); |
Christoph Lameter | 48667e7 | 2008-02-04 22:28:31 -0800 | [diff] [blame] | 286 | |
Paul Mundt | 0738c4b | 2008-03-12 16:51:31 +0900 | [diff] [blame] | 287 | /* |
| 288 | * Determine if an address is within the vmalloc range |
| 289 | * |
| 290 | * On nommu, vmalloc/vfree wrap through kmalloc/kfree directly, so there |
| 291 | * is no special casing required. |
| 292 | */ |
Christoph Lameter | 9e2779f | 2008-02-04 22:28:34 -0800 | [diff] [blame] | 293 | static inline int is_vmalloc_addr(const void *x) |
| 294 | { |
Paul Mundt | 0738c4b | 2008-03-12 16:51:31 +0900 | [diff] [blame] | 295 | #ifdef CONFIG_MMU |
Christoph Lameter | 9e2779f | 2008-02-04 22:28:34 -0800 | [diff] [blame] | 296 | unsigned long addr = (unsigned long)x; |
| 297 | |
| 298 | return addr >= VMALLOC_START && addr < VMALLOC_END; |
Paul Mundt | 0738c4b | 2008-03-12 16:51:31 +0900 | [diff] [blame] | 299 | #else |
| 300 | return 0; |
David Howells | 8ca3ed8 | 2008-02-23 15:23:37 -0800 | [diff] [blame] | 301 | #endif |
Paul Mundt | 0738c4b | 2008-03-12 16:51:31 +0900 | [diff] [blame] | 302 | } |
Christoph Lameter | 9e2779f | 2008-02-04 22:28:34 -0800 | [diff] [blame] | 303 | |
Christoph Lameter | d85f338 | 2007-05-06 14:49:39 -0700 | [diff] [blame] | 304 | static inline struct page *compound_head(struct page *page) |
| 305 | { |
Christoph Lameter | 6d77795 | 2007-05-06 14:49:40 -0700 | [diff] [blame] | 306 | if (unlikely(PageTail(page))) |
Christoph Lameter | d85f338 | 2007-05-06 14:49:39 -0700 | [diff] [blame] | 307 | return page->first_page; |
| 308 | return page; |
| 309 | } |
| 310 | |
Hugh Dickins | 4c21e2f | 2005-10-29 18:16:40 -0700 | [diff] [blame] | 311 | static inline int page_count(struct page *page) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | { |
Christoph Lameter | d85f338 | 2007-05-06 14:49:39 -0700 | [diff] [blame] | 313 | return atomic_read(&compound_head(page)->_count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 314 | } |
| 315 | |
| 316 | static inline void get_page(struct page *page) |
| 317 | { |
Christoph Lameter | d85f338 | 2007-05-06 14:49:39 -0700 | [diff] [blame] | 318 | page = compound_head(page); |
Nick Piggin | 725d704 | 2006-09-25 23:30:55 -0700 | [diff] [blame] | 319 | VM_BUG_ON(atomic_read(&page->_count) == 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | atomic_inc(&page->_count); |
| 321 | } |
| 322 | |
Christoph Lameter | b49af68 | 2007-05-06 14:49:41 -0700 | [diff] [blame] | 323 | static inline struct page *virt_to_head_page(const void *x) |
| 324 | { |
| 325 | struct page *page = virt_to_page(x); |
| 326 | return compound_head(page); |
| 327 | } |
| 328 | |
Nick Piggin | 7835e98 | 2006-03-22 00:08:40 -0800 | [diff] [blame] | 329 | /* |
| 330 | * Setup the page count before being freed into the page allocator for |
| 331 | * the first time (boot or memory hotplug) |
| 332 | */ |
| 333 | static inline void init_page_count(struct page *page) |
| 334 | { |
| 335 | atomic_set(&page->_count, 1); |
| 336 | } |
| 337 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 338 | void put_page(struct page *page); |
Alexander Zarochentsev | 1d7ea73 | 2006-08-13 23:24:27 -0700 | [diff] [blame] | 339 | void put_pages_list(struct list_head *pages); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | |
Nick Piggin | 8dfcc9b | 2006-03-22 00:08:05 -0800 | [diff] [blame] | 341 | void split_page(struct page *page, unsigned int order); |
Nick Piggin | 8dfcc9b | 2006-03-22 00:08:05 -0800 | [diff] [blame] | 342 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | /* |
Andy Whitcroft | 33f2ef8 | 2006-12-06 20:33:32 -0800 | [diff] [blame] | 344 | * Compound pages have a destructor function. Provide a |
| 345 | * prototype for that function and accessor functions. |
| 346 | * These are _only_ valid on the head of a PG_compound page. |
| 347 | */ |
| 348 | typedef void compound_page_dtor(struct page *); |
| 349 | |
| 350 | static inline void set_compound_page_dtor(struct page *page, |
| 351 | compound_page_dtor *dtor) |
| 352 | { |
| 353 | page[1].lru.next = (void *)dtor; |
| 354 | } |
| 355 | |
| 356 | static inline compound_page_dtor *get_compound_page_dtor(struct page *page) |
| 357 | { |
| 358 | return (compound_page_dtor *)page[1].lru.next; |
| 359 | } |
| 360 | |
Christoph Lameter | d85f338 | 2007-05-06 14:49:39 -0700 | [diff] [blame] | 361 | static inline int compound_order(struct page *page) |
| 362 | { |
Christoph Lameter | 6d77795 | 2007-05-06 14:49:40 -0700 | [diff] [blame] | 363 | if (!PageHead(page)) |
Christoph Lameter | d85f338 | 2007-05-06 14:49:39 -0700 | [diff] [blame] | 364 | return 0; |
| 365 | return (unsigned long)page[1].lru.prev; |
| 366 | } |
| 367 | |
| 368 | static inline void set_compound_order(struct page *page, unsigned long order) |
| 369 | { |
| 370 | page[1].lru.prev = (void *)order; |
| 371 | } |
| 372 | |
Andy Whitcroft | 33f2ef8 | 2006-12-06 20:33:32 -0800 | [diff] [blame] | 373 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | * Multiple processes may "see" the same page. E.g. for untouched |
| 375 | * mappings of /dev/null, all processes see the same page full of |
| 376 | * zeroes, and text pages of executables and shared libraries have |
| 377 | * only one copy in memory, at most, normally. |
| 378 | * |
| 379 | * 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] | 380 | * page_count() == 0 means the page is free. page->lru is then used for |
| 381 | * freelist management in the buddy allocator. |
Nick Piggin | da6052f | 2006-09-25 23:31:35 -0700 | [diff] [blame] | 382 | * page_count() > 0 means the page has been allocated. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | * |
Nick Piggin | da6052f | 2006-09-25 23:31:35 -0700 | [diff] [blame] | 384 | * Pages are allocated by the slab allocator in order to provide memory |
| 385 | * to kmalloc and kmem_cache_alloc. In this case, the management of the |
| 386 | * page, and the fields in 'struct page' are the responsibility of mm/slab.c |
| 387 | * unless a particular usage is carefully commented. (the responsibility of |
| 388 | * freeing the kmalloc memory is the caller's, of course). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | * |
Nick Piggin | da6052f | 2006-09-25 23:31:35 -0700 | [diff] [blame] | 390 | * A page may be used by anyone else who does a __get_free_page(). |
| 391 | * In this case, page_count still tracks the references, and should only |
| 392 | * be used through the normal accessor functions. The top bits of page->flags |
| 393 | * and page->virtual store page management information, but all other fields |
| 394 | * are unused and could be used privately, carefully. The management of this |
| 395 | * page is the responsibility of the one who allocated it, and those who have |
| 396 | * subsequently been given references to it. |
| 397 | * |
| 398 | * The other pages (we may call them "pagecache pages") are completely |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | * managed by the Linux memory manager: I/O, buffers, swapping etc. |
| 400 | * The following discussion applies only to them. |
| 401 | * |
Nick Piggin | da6052f | 2006-09-25 23:31:35 -0700 | [diff] [blame] | 402 | * A pagecache page contains an opaque `private' member, which belongs to the |
| 403 | * page's address_space. Usually, this is the address of a circular list of |
| 404 | * the page's disk buffers. PG_private must be set to tell the VM to call |
| 405 | * into the filesystem to release these pages. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | * |
Nick Piggin | da6052f | 2006-09-25 23:31:35 -0700 | [diff] [blame] | 407 | * A page may belong to an inode's memory mapping. In this case, page->mapping |
| 408 | * is the pointer to the inode, and page->index is the file offset of the page, |
| 409 | * in units of PAGE_CACHE_SIZE. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 410 | * |
Nick Piggin | da6052f | 2006-09-25 23:31:35 -0700 | [diff] [blame] | 411 | * If pagecache pages are not associated with an inode, they are said to be |
| 412 | * anonymous pages. These may become associated with the swapcache, and in that |
| 413 | * 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] | 414 | * |
Nick Piggin | da6052f | 2006-09-25 23:31:35 -0700 | [diff] [blame] | 415 | * In either case (swapcache or inode backed), the pagecache itself holds one |
| 416 | * reference to the page. Setting PG_private should also increment the |
| 417 | * refcount. The each user mapping also has a reference to the page. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | * |
Nick Piggin | da6052f | 2006-09-25 23:31:35 -0700 | [diff] [blame] | 419 | * The pagecache pages are stored in a per-mapping radix tree, which is |
| 420 | * rooted at mapping->page_tree, and indexed by offset. |
| 421 | * Where 2.4 and early 2.6 kernels kept dirty/clean pages in per-address_space |
| 422 | * 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] | 423 | * |
Nick Piggin | da6052f | 2006-09-25 23:31:35 -0700 | [diff] [blame] | 424 | * All pagecache pages may be subject to I/O: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | * - inode pages may need to be read from disk, |
| 426 | * - inode pages which have been modified and are MAP_SHARED may need |
Nick Piggin | da6052f | 2006-09-25 23:31:35 -0700 | [diff] [blame] | 427 | * to be written back to the inode on disk, |
| 428 | * - anonymous pages (including MAP_PRIVATE file mappings) which have been |
| 429 | * modified may need to be swapped out to swap space and (later) to be read |
| 430 | * back into memory. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | */ |
| 432 | |
| 433 | /* |
| 434 | * The zone field is never updated after free_area_init_core() |
| 435 | * 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] | 436 | */ |
Dave Hansen | 348f8b6 | 2005-06-23 00:07:40 -0700 | [diff] [blame] | 437 | |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 438 | |
| 439 | /* |
| 440 | * page->flags layout: |
| 441 | * |
| 442 | * There are three possibilities for how page->flags get |
| 443 | * laid out. The first is for the normal case, without |
| 444 | * sparsemem. The second is for sparsemem when there is |
| 445 | * plenty of space for node and section. The last is when |
| 446 | * we have run out of space and have to fall back to an |
| 447 | * alternate (slower) way of determining the node. |
| 448 | * |
Christoph Lameter | 308c05e | 2008-04-28 02:12:43 -0700 | [diff] [blame] | 449 | * No sparsemem or sparsemem vmemmap: | NODE | ZONE | ... | FLAGS | |
| 450 | * classic sparse with space for node:| SECTION | NODE | ZONE | ... | FLAGS | |
| 451 | * classic sparse no space for node: | SECTION | ZONE | ... | FLAGS | |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 452 | */ |
Christoph Lameter | 308c05e | 2008-04-28 02:12:43 -0700 | [diff] [blame] | 453 | #if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP) |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 454 | #define SECTIONS_WIDTH SECTIONS_SHIFT |
| 455 | #else |
| 456 | #define SECTIONS_WIDTH 0 |
| 457 | #endif |
| 458 | |
| 459 | #define ZONES_WIDTH ZONES_SHIFT |
| 460 | |
Christoph Lameter | 9223b41 | 2008-04-28 02:12:48 -0700 | [diff] [blame] | 461 | #if SECTIONS_WIDTH+ZONES_WIDTH+NODES_SHIFT <= BITS_PER_LONG - NR_PAGEFLAGS |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 462 | #define NODES_WIDTH NODES_SHIFT |
| 463 | #else |
Christoph Lameter | 308c05e | 2008-04-28 02:12:43 -0700 | [diff] [blame] | 464 | #ifdef CONFIG_SPARSEMEM_VMEMMAP |
| 465 | #error "Vmemmap: No space for nodes field in page flags" |
| 466 | #endif |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 467 | #define NODES_WIDTH 0 |
| 468 | #endif |
| 469 | |
| 470 | /* Page flags: | [SECTION] | [NODE] | ZONE | ... | FLAGS | */ |
Andi Kleen | 07808b7 | 2005-11-05 17:25:53 +0100 | [diff] [blame] | 471 | #define SECTIONS_PGOFF ((sizeof(unsigned long)*8) - SECTIONS_WIDTH) |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 472 | #define NODES_PGOFF (SECTIONS_PGOFF - NODES_WIDTH) |
| 473 | #define ZONES_PGOFF (NODES_PGOFF - ZONES_WIDTH) |
| 474 | |
| 475 | /* |
| 476 | * We are going to use the flags for the page to node mapping if its in |
| 477 | * there. This includes the case where there is no node, so it is implicit. |
| 478 | */ |
Christoph Lameter | 89689ae | 2006-12-06 20:31:45 -0800 | [diff] [blame] | 479 | #if !(NODES_WIDTH > 0 || NODES_SHIFT == 0) |
| 480 | #define NODE_NOT_IN_PAGE_FLAGS |
| 481 | #endif |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 482 | |
| 483 | #ifndef PFN_SECTION_SHIFT |
| 484 | #define PFN_SECTION_SHIFT 0 |
| 485 | #endif |
Dave Hansen | 348f8b6 | 2005-06-23 00:07:40 -0700 | [diff] [blame] | 486 | |
| 487 | /* |
| 488 | * Define the bit shifts to access each section. For non-existant |
| 489 | * sections we define the shift as 0; that plus a 0 mask ensures |
| 490 | * the compiler will optimise away reference to them. |
| 491 | */ |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 492 | #define SECTIONS_PGSHIFT (SECTIONS_PGOFF * (SECTIONS_WIDTH != 0)) |
| 493 | #define NODES_PGSHIFT (NODES_PGOFF * (NODES_WIDTH != 0)) |
| 494 | #define ZONES_PGSHIFT (ZONES_PGOFF * (ZONES_WIDTH != 0)) |
Dave Hansen | 348f8b6 | 2005-06-23 00:07:40 -0700 | [diff] [blame] | 495 | |
Christoph Lameter | 89689ae | 2006-12-06 20:31:45 -0800 | [diff] [blame] | 496 | /* NODE:ZONE or SECTION:ZONE is used to ID a zone for the buddy allcator */ |
| 497 | #ifdef NODE_NOT_IN_PAGEFLAGS |
| 498 | #define ZONEID_SHIFT (SECTIONS_SHIFT + ZONES_SHIFT) |
Andy Whitcroft | bd8029b | 2007-02-10 01:43:14 -0800 | [diff] [blame] | 499 | #define ZONEID_PGOFF ((SECTIONS_PGOFF < ZONES_PGOFF)? \ |
| 500 | SECTIONS_PGOFF : ZONES_PGOFF) |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 501 | #else |
Christoph Lameter | 89689ae | 2006-12-06 20:31:45 -0800 | [diff] [blame] | 502 | #define ZONEID_SHIFT (NODES_SHIFT + ZONES_SHIFT) |
Andy Whitcroft | bd8029b | 2007-02-10 01:43:14 -0800 | [diff] [blame] | 503 | #define ZONEID_PGOFF ((NODES_PGOFF < ZONES_PGOFF)? \ |
| 504 | NODES_PGOFF : ZONES_PGOFF) |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 505 | #endif |
Christoph Lameter | 89689ae | 2006-12-06 20:31:45 -0800 | [diff] [blame] | 506 | |
Andy Whitcroft | bd8029b | 2007-02-10 01:43:14 -0800 | [diff] [blame] | 507 | #define ZONEID_PGSHIFT (ZONEID_PGOFF * (ZONEID_SHIFT != 0)) |
Dave Hansen | 348f8b6 | 2005-06-23 00:07:40 -0700 | [diff] [blame] | 508 | |
Christoph Lameter | 9223b41 | 2008-04-28 02:12:48 -0700 | [diff] [blame] | 509 | #if SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS |
| 510 | #error SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS |
Dave Hansen | 348f8b6 | 2005-06-23 00:07:40 -0700 | [diff] [blame] | 511 | #endif |
| 512 | |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 513 | #define ZONES_MASK ((1UL << ZONES_WIDTH) - 1) |
| 514 | #define NODES_MASK ((1UL << NODES_WIDTH) - 1) |
| 515 | #define SECTIONS_MASK ((1UL << SECTIONS_WIDTH) - 1) |
Christoph Lameter | 89689ae | 2006-12-06 20:31:45 -0800 | [diff] [blame] | 516 | #define ZONEID_MASK ((1UL << ZONEID_SHIFT) - 1) |
Dave Hansen | 348f8b6 | 2005-06-23 00:07:40 -0700 | [diff] [blame] | 517 | |
Christoph Lameter | 2f1b624 | 2006-09-25 23:31:13 -0700 | [diff] [blame] | 518 | static inline enum zone_type page_zonenum(struct page *page) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 519 | { |
Dave Hansen | 348f8b6 | 2005-06-23 00:07:40 -0700 | [diff] [blame] | 520 | return (page->flags >> ZONES_PGSHIFT) & ZONES_MASK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 521 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 522 | |
Christoph Lameter | 89689ae | 2006-12-06 20:31:45 -0800 | [diff] [blame] | 523 | /* |
| 524 | * The identification function is only used by the buddy allocator for |
| 525 | * determining if two pages could be buddies. We are not really |
| 526 | * identifying a zone since we could be using a the section number |
| 527 | * id if we have not node id available in page flags. |
| 528 | * We guarantee only that it will return the same value for two |
| 529 | * combinable pages in a zone. |
| 530 | */ |
Andy Whitcroft | cb2b95e | 2006-06-23 02:03:01 -0700 | [diff] [blame] | 531 | static inline int page_zone_id(struct page *page) |
| 532 | { |
Christoph Lameter | 89689ae | 2006-12-06 20:31:45 -0800 | [diff] [blame] | 533 | return (page->flags >> ZONEID_PGSHIFT) & ZONEID_MASK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 534 | } |
| 535 | |
Andy Whitcroft | 25ba77c | 2006-12-06 20:33:03 -0800 | [diff] [blame] | 536 | static inline int zone_to_nid(struct zone *zone) |
Christoph Lameter | 89fa302 | 2006-09-25 23:31:55 -0700 | [diff] [blame] | 537 | { |
Christoph Lameter | d5f541e | 2006-09-27 01:50:08 -0700 | [diff] [blame] | 538 | #ifdef CONFIG_NUMA |
| 539 | return zone->node; |
| 540 | #else |
| 541 | return 0; |
| 542 | #endif |
Christoph Lameter | 89fa302 | 2006-09-25 23:31:55 -0700 | [diff] [blame] | 543 | } |
| 544 | |
Christoph Lameter | 89689ae | 2006-12-06 20:31:45 -0800 | [diff] [blame] | 545 | #ifdef NODE_NOT_IN_PAGE_FLAGS |
Andy Whitcroft | 25ba77c | 2006-12-06 20:33:03 -0800 | [diff] [blame] | 546 | extern int page_to_nid(struct page *page); |
Christoph Lameter | 89689ae | 2006-12-06 20:31:45 -0800 | [diff] [blame] | 547 | #else |
Andy Whitcroft | 25ba77c | 2006-12-06 20:33:03 -0800 | [diff] [blame] | 548 | static inline int page_to_nid(struct page *page) |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 549 | { |
Christoph Lameter | 89689ae | 2006-12-06 20:31:45 -0800 | [diff] [blame] | 550 | return (page->flags >> NODES_PGSHIFT) & NODES_MASK; |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 551 | } |
Christoph Lameter | 89689ae | 2006-12-06 20:31:45 -0800 | [diff] [blame] | 552 | #endif |
| 553 | |
| 554 | static inline struct zone *page_zone(struct page *page) |
| 555 | { |
| 556 | return &NODE_DATA(page_to_nid(page))->node_zones[page_zonenum(page)]; |
| 557 | } |
| 558 | |
Christoph Lameter | 308c05e | 2008-04-28 02:12:43 -0700 | [diff] [blame] | 559 | #if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP) |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 560 | static inline unsigned long page_to_section(struct page *page) |
| 561 | { |
| 562 | return (page->flags >> SECTIONS_PGSHIFT) & SECTIONS_MASK; |
| 563 | } |
Christoph Lameter | 308c05e | 2008-04-28 02:12:43 -0700 | [diff] [blame] | 564 | #endif |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 565 | |
Christoph Lameter | 2f1b624 | 2006-09-25 23:31:13 -0700 | [diff] [blame] | 566 | 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] | 567 | { |
Dave Hansen | 348f8b6 | 2005-06-23 00:07:40 -0700 | [diff] [blame] | 568 | page->flags &= ~(ZONES_MASK << ZONES_PGSHIFT); |
| 569 | page->flags |= (zone & ZONES_MASK) << ZONES_PGSHIFT; |
| 570 | } |
Christoph Lameter | 2f1b624 | 2006-09-25 23:31:13 -0700 | [diff] [blame] | 571 | |
Dave Hansen | 348f8b6 | 2005-06-23 00:07:40 -0700 | [diff] [blame] | 572 | static inline void set_page_node(struct page *page, unsigned long node) |
| 573 | { |
| 574 | page->flags &= ~(NODES_MASK << NODES_PGSHIFT); |
| 575 | page->flags |= (node & NODES_MASK) << NODES_PGSHIFT; |
| 576 | } |
Christoph Lameter | 89689ae | 2006-12-06 20:31:45 -0800 | [diff] [blame] | 577 | |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 578 | static inline void set_page_section(struct page *page, unsigned long section) |
| 579 | { |
| 580 | page->flags &= ~(SECTIONS_MASK << SECTIONS_PGSHIFT); |
| 581 | page->flags |= (section & SECTIONS_MASK) << SECTIONS_PGSHIFT; |
| 582 | } |
Dave Hansen | 348f8b6 | 2005-06-23 00:07:40 -0700 | [diff] [blame] | 583 | |
Christoph Lameter | 2f1b624 | 2006-09-25 23:31:13 -0700 | [diff] [blame] | 584 | 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] | 585 | unsigned long node, unsigned long pfn) |
Dave Hansen | 348f8b6 | 2005-06-23 00:07:40 -0700 | [diff] [blame] | 586 | { |
| 587 | set_page_zone(page, zone); |
| 588 | set_page_node(page, node); |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 589 | set_page_section(page, pfn_to_section_nr(pfn)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 590 | } |
| 591 | |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 592 | /* |
Eric Paris | 7cd9414 | 2007-11-26 18:47:40 -0500 | [diff] [blame] | 593 | * If a hint addr is less than mmap_min_addr change hint to be as |
| 594 | * low as possible but still greater than mmap_min_addr |
| 595 | */ |
| 596 | static inline unsigned long round_hint_to_min(unsigned long hint) |
| 597 | { |
| 598 | #ifdef CONFIG_SECURITY |
| 599 | hint &= PAGE_MASK; |
| 600 | if (((void *)hint != NULL) && |
| 601 | (hint < mmap_min_addr)) |
| 602 | return PAGE_ALIGN(mmap_min_addr); |
| 603 | #endif |
| 604 | return hint; |
| 605 | } |
| 606 | |
| 607 | /* |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 608 | * Some inline functions in vmstat.h depend on page_zone() |
| 609 | */ |
| 610 | #include <linux/vmstat.h> |
| 611 | |
Ingo Molnar | 652050a | 2006-01-14 13:21:30 -0800 | [diff] [blame] | 612 | static __always_inline void *lowmem_page_address(struct page *page) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | { |
| 614 | return __va(page_to_pfn(page) << PAGE_SHIFT); |
| 615 | } |
| 616 | |
| 617 | #if defined(CONFIG_HIGHMEM) && !defined(WANT_PAGE_VIRTUAL) |
| 618 | #define HASHED_PAGE_VIRTUAL |
| 619 | #endif |
| 620 | |
| 621 | #if defined(WANT_PAGE_VIRTUAL) |
| 622 | #define page_address(page) ((page)->virtual) |
| 623 | #define set_page_address(page, address) \ |
| 624 | do { \ |
| 625 | (page)->virtual = (address); \ |
| 626 | } while(0) |
| 627 | #define page_address_init() do { } while(0) |
| 628 | #endif |
| 629 | |
| 630 | #if defined(HASHED_PAGE_VIRTUAL) |
| 631 | void *page_address(struct page *page); |
| 632 | void set_page_address(struct page *page, void *virtual); |
| 633 | void page_address_init(void); |
| 634 | #endif |
| 635 | |
| 636 | #if !defined(HASHED_PAGE_VIRTUAL) && !defined(WANT_PAGE_VIRTUAL) |
| 637 | #define page_address(page) lowmem_page_address(page) |
| 638 | #define set_page_address(page, address) do { } while(0) |
| 639 | #define page_address_init() do { } while(0) |
| 640 | #endif |
| 641 | |
| 642 | /* |
| 643 | * On an anonymous page mapped into a user virtual memory area, |
| 644 | * page->mapping points to its anon_vma, not to a struct address_space; |
| 645 | * with the PAGE_MAPPING_ANON bit set to distinguish it. |
| 646 | * |
| 647 | * Please note that, confusingly, "page_mapping" refers to the inode |
| 648 | * address_space which maps the page from disk; whereas "page_mapped" |
| 649 | * refers to user virtual address space into which the page is mapped. |
| 650 | */ |
| 651 | #define PAGE_MAPPING_ANON 1 |
| 652 | |
| 653 | extern struct address_space swapper_space; |
| 654 | static inline struct address_space *page_mapping(struct page *page) |
| 655 | { |
| 656 | struct address_space *mapping = page->mapping; |
| 657 | |
Christoph Lameter | b5fab14 | 2007-07-17 04:03:33 -0700 | [diff] [blame] | 658 | VM_BUG_ON(PageSlab(page)); |
Andrew Morton | 726b801 | 2008-04-28 02:12:44 -0700 | [diff] [blame] | 659 | #ifdef CONFIG_SWAP |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 660 | if (unlikely(PageSwapCache(page))) |
| 661 | mapping = &swapper_space; |
Andrew Morton | 726b801 | 2008-04-28 02:12:44 -0700 | [diff] [blame] | 662 | else |
| 663 | #endif |
| 664 | if (unlikely((unsigned long)mapping & PAGE_MAPPING_ANON)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 665 | mapping = NULL; |
| 666 | return mapping; |
| 667 | } |
| 668 | |
| 669 | static inline int PageAnon(struct page *page) |
| 670 | { |
| 671 | return ((unsigned long)page->mapping & PAGE_MAPPING_ANON) != 0; |
| 672 | } |
| 673 | |
| 674 | /* |
| 675 | * Return the pagecache index of the passed page. Regular pagecache pages |
| 676 | * use ->index whereas swapcache pages use ->private |
| 677 | */ |
| 678 | static inline pgoff_t page_index(struct page *page) |
| 679 | { |
| 680 | if (unlikely(PageSwapCache(page))) |
Hugh Dickins | 4c21e2f | 2005-10-29 18:16:40 -0700 | [diff] [blame] | 681 | return page_private(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 682 | return page->index; |
| 683 | } |
| 684 | |
| 685 | /* |
| 686 | * The atomic page->_mapcount, like _count, starts from -1: |
| 687 | * so that transitions both from it and to it can be tracked, |
| 688 | * using atomic_inc_and_test and atomic_add_negative(-1). |
| 689 | */ |
| 690 | static inline void reset_page_mapcount(struct page *page) |
| 691 | { |
| 692 | atomic_set(&(page)->_mapcount, -1); |
| 693 | } |
| 694 | |
| 695 | static inline int page_mapcount(struct page *page) |
| 696 | { |
| 697 | return atomic_read(&(page)->_mapcount) + 1; |
| 698 | } |
| 699 | |
| 700 | /* |
| 701 | * Return true if this page is mapped into pagetables. |
| 702 | */ |
| 703 | static inline int page_mapped(struct page *page) |
| 704 | { |
| 705 | return atomic_read(&(page)->_mapcount) >= 0; |
| 706 | } |
| 707 | |
| 708 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 709 | * Different kinds of faults, as returned by handle_mm_fault(). |
| 710 | * Used to decide whether a process gets delivered SIGBUS or |
| 711 | * just gets major/minor fault counters bumped up. |
| 712 | */ |
Nick Piggin | d0217ac | 2007-07-19 01:47:03 -0700 | [diff] [blame] | 713 | |
Nick Piggin | 83c5407 | 2007-07-19 01:47:05 -0700 | [diff] [blame] | 714 | #define VM_FAULT_MINOR 0 /* For backwards compat. Remove me quickly. */ |
Nick Piggin | d0217ac | 2007-07-19 01:47:03 -0700 | [diff] [blame] | 715 | |
Nick Piggin | 83c5407 | 2007-07-19 01:47:05 -0700 | [diff] [blame] | 716 | #define VM_FAULT_OOM 0x0001 |
| 717 | #define VM_FAULT_SIGBUS 0x0002 |
| 718 | #define VM_FAULT_MAJOR 0x0004 |
| 719 | #define VM_FAULT_WRITE 0x0008 /* Special case for get_user_pages */ |
Nick Piggin | f33ea7f | 2005-08-03 20:24:01 +1000 | [diff] [blame] | 720 | |
Nick Piggin | 83c5407 | 2007-07-19 01:47:05 -0700 | [diff] [blame] | 721 | #define VM_FAULT_NOPAGE 0x0100 /* ->fault installed the pte, not return page */ |
| 722 | #define VM_FAULT_LOCKED 0x0200 /* ->fault locked the returned page */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 723 | |
Nick Piggin | 83c5407 | 2007-07-19 01:47:05 -0700 | [diff] [blame] | 724 | #define VM_FAULT_ERROR (VM_FAULT_OOM | VM_FAULT_SIGBUS) |
Nick Piggin | d0217ac | 2007-07-19 01:47:03 -0700 | [diff] [blame] | 725 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 726 | #define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK) |
| 727 | |
| 728 | extern void show_free_areas(void); |
| 729 | |
| 730 | #ifdef CONFIG_SHMEM |
Lee Schermerhorn | 89e004ea | 2008-10-18 20:26:43 -0700 | [diff] [blame] | 731 | extern int shmem_lock(struct file *file, int lock, struct user_struct *user); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | #else |
Russell King | 03b00eb | 2006-01-06 00:10:52 -0800 | [diff] [blame] | 733 | static inline int shmem_lock(struct file *file, int lock, |
Lee Schermerhorn | 89e004ea | 2008-10-18 20:26:43 -0700 | [diff] [blame] | 734 | struct user_struct *user) |
Russell King | 03b00eb | 2006-01-06 00:10:52 -0800 | [diff] [blame] | 735 | { |
| 736 | return 0; |
| 737 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 738 | #endif |
| 739 | struct file *shmem_file_setup(char *name, loff_t size, unsigned long flags); |
| 740 | |
| 741 | int shmem_zero_setup(struct vm_area_struct *); |
| 742 | |
David Howells | b0e1519 | 2006-01-06 00:11:42 -0800 | [diff] [blame] | 743 | #ifndef CONFIG_MMU |
| 744 | extern unsigned long shmem_get_unmapped_area(struct file *file, |
| 745 | unsigned long addr, |
| 746 | unsigned long len, |
| 747 | unsigned long pgoff, |
| 748 | unsigned long flags); |
| 749 | #endif |
| 750 | |
Alexey Dobriyan | e8edc6e | 2007-05-21 01:22:52 +0400 | [diff] [blame] | 751 | extern int can_do_mlock(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 752 | extern int user_shm_lock(size_t, struct user_struct *); |
| 753 | extern void user_shm_unlock(size_t, struct user_struct *); |
| 754 | |
| 755 | /* |
| 756 | * Parameter block passed down to zap_pte_range in exceptional cases. |
| 757 | */ |
| 758 | struct zap_details { |
| 759 | struct vm_area_struct *nonlinear_vma; /* Check page->index if set */ |
| 760 | struct address_space *check_mapping; /* Check page->mapping if set */ |
| 761 | pgoff_t first_index; /* Lowest page->index to unmap */ |
| 762 | pgoff_t last_index; /* Highest page->index to unmap */ |
| 763 | spinlock_t *i_mmap_lock; /* For unmap_mapping_range: */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | unsigned long truncate_count; /* Compare vm_truncate_count */ |
| 765 | }; |
| 766 | |
Nick Piggin | 7e67513 | 2008-04-28 02:13:00 -0700 | [diff] [blame] | 767 | struct page *vm_normal_page(struct vm_area_struct *vma, unsigned long addr, |
| 768 | pte_t pte); |
| 769 | |
Jack Steiner | c627f9c | 2008-07-29 22:33:53 -0700 | [diff] [blame] | 770 | int zap_vma_ptes(struct vm_area_struct *vma, unsigned long address, |
| 771 | unsigned long size); |
Hugh Dickins | ee39b37 | 2005-04-19 13:29:15 -0700 | [diff] [blame] | 772 | 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] | 773 | unsigned long size, struct zap_details *); |
Hugh Dickins | 508034a | 2005-10-29 18:16:30 -0700 | [diff] [blame] | 774 | unsigned long unmap_vmas(struct mmu_gather **tlb, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 775 | struct vm_area_struct *start_vma, unsigned long start_addr, |
| 776 | unsigned long end_addr, unsigned long *nr_accounted, |
| 777 | struct zap_details *); |
Matt Mackall | e647309 | 2008-02-04 22:29:01 -0800 | [diff] [blame] | 778 | |
| 779 | /** |
| 780 | * mm_walk - callbacks for walk_page_range |
| 781 | * @pgd_entry: if set, called for each non-empty PGD (top-level) entry |
| 782 | * @pud_entry: if set, called for each non-empty PUD (2nd-level) entry |
| 783 | * @pmd_entry: if set, called for each non-empty PMD (3rd-level) entry |
| 784 | * @pte_entry: if set, called for each non-empty PTE (4th-level) entry |
| 785 | * @pte_hole: if set, called for each hole at all levels |
| 786 | * |
| 787 | * (see walk_page_range for more details) |
| 788 | */ |
| 789 | struct mm_walk { |
Dave Hansen | 2165009 | 2008-06-12 15:21:47 -0700 | [diff] [blame] | 790 | int (*pgd_entry)(pgd_t *, unsigned long, unsigned long, struct mm_walk *); |
| 791 | int (*pud_entry)(pud_t *, unsigned long, unsigned long, struct mm_walk *); |
| 792 | int (*pmd_entry)(pmd_t *, unsigned long, unsigned long, struct mm_walk *); |
| 793 | int (*pte_entry)(pte_t *, unsigned long, unsigned long, struct mm_walk *); |
| 794 | int (*pte_hole)(unsigned long, unsigned long, struct mm_walk *); |
| 795 | struct mm_struct *mm; |
| 796 | void *private; |
Matt Mackall | e647309 | 2008-02-04 22:29:01 -0800 | [diff] [blame] | 797 | }; |
| 798 | |
Dave Hansen | 2165009 | 2008-06-12 15:21:47 -0700 | [diff] [blame] | 799 | int walk_page_range(unsigned long addr, unsigned long end, |
| 800 | struct mm_walk *walk); |
Jan Beulich | 42b7772 | 2008-07-23 21:27:10 -0700 | [diff] [blame] | 801 | void free_pgd_range(struct mmu_gather *tlb, unsigned long addr, |
Hugh Dickins | 3bf5ee9 | 2005-04-19 13:29:16 -0700 | [diff] [blame] | 802 | unsigned long end, unsigned long floor, unsigned long ceiling); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 803 | int copy_page_range(struct mm_struct *dst, struct mm_struct *src, |
| 804 | struct vm_area_struct *vma); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 805 | void unmap_mapping_range(struct address_space *mapping, |
| 806 | loff_t const holebegin, loff_t const holelen, int even_cows); |
Rik van Riel | 28b2ee2 | 2008-07-23 21:27:05 -0700 | [diff] [blame] | 807 | int generic_access_phys(struct vm_area_struct *vma, unsigned long addr, |
| 808 | void *buf, int len, int write); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 809 | |
| 810 | static inline void unmap_shared_mapping_range(struct address_space *mapping, |
| 811 | loff_t const holebegin, loff_t const holelen) |
| 812 | { |
| 813 | unmap_mapping_range(mapping, holebegin, holelen, 0); |
| 814 | } |
| 815 | |
| 816 | extern int vmtruncate(struct inode * inode, loff_t offset); |
Badari Pulavarty | f6b3ec2 | 2006-01-06 00:10:38 -0800 | [diff] [blame] | 817 | 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] | 818 | |
David Howells | 7ee1dd3 | 2006-01-06 00:11:44 -0800 | [diff] [blame] | 819 | #ifdef CONFIG_MMU |
Nick Piggin | 83c5407 | 2007-07-19 01:47:05 -0700 | [diff] [blame] | 820 | 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] | 821 | unsigned long address, int write_access); |
David Howells | 7ee1dd3 | 2006-01-06 00:11:44 -0800 | [diff] [blame] | 822 | #else |
| 823 | static inline int handle_mm_fault(struct mm_struct *mm, |
| 824 | struct vm_area_struct *vma, unsigned long address, |
| 825 | int write_access) |
| 826 | { |
| 827 | /* should never happen if there's no MMU */ |
| 828 | BUG(); |
| 829 | return VM_FAULT_SIGBUS; |
| 830 | } |
| 831 | #endif |
Nick Piggin | f33ea7f | 2005-08-03 20:24:01 +1000 | [diff] [blame] | 832 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 833 | extern int make_pages_present(unsigned long addr, unsigned long end); |
| 834 | 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] | 835 | |
| 836 | int get_user_pages(struct task_struct *tsk, struct mm_struct *mm, unsigned long start, |
| 837 | int len, int write, int force, struct page **pages, struct vm_area_struct **vmas); |
| 838 | |
David Howells | cf9a2ae | 2006-08-29 19:05:54 +0100 | [diff] [blame] | 839 | extern int try_to_release_page(struct page * page, gfp_t gfp_mask); |
| 840 | extern void do_invalidatepage(struct page *page, unsigned long offset); |
| 841 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 842 | int __set_page_dirty_nobuffers(struct page *page); |
Ken Chen | 7671932 | 2007-02-10 01:43:15 -0800 | [diff] [blame] | 843 | int __set_page_dirty_no_writeback(struct page *page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 844 | int redirty_page_for_writepage(struct writeback_control *wbc, |
| 845 | struct page *page); |
Harvey Harrison | b3c9752 | 2008-02-13 15:03:15 -0800 | [diff] [blame] | 846 | int set_page_dirty(struct page *page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 847 | int set_page_dirty_lock(struct page *page); |
| 848 | int clear_page_dirty_for_io(struct page *page); |
| 849 | |
Ollie Wild | b6a2fea | 2007-07-19 01:48:16 -0700 | [diff] [blame] | 850 | extern unsigned long move_page_tables(struct vm_area_struct *vma, |
| 851 | unsigned long old_addr, struct vm_area_struct *new_vma, |
| 852 | unsigned long new_addr, unsigned long len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 853 | extern unsigned long do_mremap(unsigned long addr, |
| 854 | unsigned long old_len, unsigned long new_len, |
| 855 | unsigned long flags, unsigned long new_addr); |
Ollie Wild | b6a2fea | 2007-07-19 01:48:16 -0700 | [diff] [blame] | 856 | extern int mprotect_fixup(struct vm_area_struct *vma, |
| 857 | struct vm_area_struct **pprev, unsigned long start, |
| 858 | unsigned long end, unsigned long newflags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 859 | |
Nick Piggin | 21cc199 | 2008-07-25 19:45:22 -0700 | [diff] [blame] | 860 | /* |
| 861 | * get_user_pages_fast provides equivalent functionality to get_user_pages, |
| 862 | * operating on current and current->mm (force=0 and doesn't return any vmas). |
| 863 | * |
| 864 | * get_user_pages_fast may take mmap_sem and page tables, so no assumptions |
| 865 | * can be made about locking. get_user_pages_fast is to be implemented in a |
| 866 | * way that is advantageous (vs get_user_pages()) when the user memory area is |
| 867 | * already faulted in and present in ptes. However if the pages have to be |
| 868 | * faulted in, it may turn out to be slightly slower). |
| 869 | */ |
| 870 | int get_user_pages_fast(unsigned long start, int nr_pages, int write, |
| 871 | struct page **pages); |
| 872 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 873 | /* |
Rusty Russell | 8e1f936 | 2007-07-17 04:03:17 -0700 | [diff] [blame] | 874 | * A callback you can register to apply pressure to ageable caches. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 875 | * |
Rusty Russell | 8e1f936 | 2007-07-17 04:03:17 -0700 | [diff] [blame] | 876 | * 'shrink' is passed a count 'nr_to_scan' and a 'gfpmask'. It should |
| 877 | * look through the least-recently-used 'nr_to_scan' entries and |
| 878 | * attempt to free them up. It should return the number of objects |
| 879 | * which remain in the cache. If it returns -1, it means it cannot do |
| 880 | * any scanning at this time (eg. there is a risk of deadlock). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 881 | * |
Rusty Russell | 8e1f936 | 2007-07-17 04:03:17 -0700 | [diff] [blame] | 882 | * The 'gfpmask' refers to the allocation we are currently trying to |
| 883 | * fulfil. |
| 884 | * |
| 885 | * Note that 'shrink' will be passed nr_to_scan == 0 when the VM is |
| 886 | * querying the cache size, so a fastpath for that case is appropriate. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 887 | */ |
Rusty Russell | 8e1f936 | 2007-07-17 04:03:17 -0700 | [diff] [blame] | 888 | struct shrinker { |
| 889 | int (*shrink)(int nr_to_scan, gfp_t gfp_mask); |
| 890 | int seeks; /* seeks to recreate an obj */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 891 | |
Rusty Russell | 8e1f936 | 2007-07-17 04:03:17 -0700 | [diff] [blame] | 892 | /* These are for internal use */ |
| 893 | struct list_head list; |
| 894 | long nr; /* objs pending delete */ |
| 895 | }; |
| 896 | #define DEFAULT_SEEKS 2 /* A good number if you don't know better. */ |
| 897 | extern void register_shrinker(struct shrinker *); |
| 898 | extern void unregister_shrinker(struct shrinker *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 899 | |
Alexey Dobriyan | 4e950f6 | 2007-07-30 02:36:13 +0400 | [diff] [blame] | 900 | int vma_wants_writenotify(struct vm_area_struct *vma); |
Peter Zijlstra | d08b385 | 2006-09-25 23:30:57 -0700 | [diff] [blame] | 901 | |
Harvey Harrison | b3c9752 | 2008-02-13 15:03:15 -0800 | [diff] [blame] | 902 | extern pte_t *get_locked_pte(struct mm_struct *mm, unsigned long addr, spinlock_t **ptl); |
Linus Torvalds | c9cfcdd | 2005-11-29 14:03:14 -0800 | [diff] [blame] | 903 | |
Nick Piggin | 5f22df0 | 2007-05-06 14:49:02 -0700 | [diff] [blame] | 904 | #ifdef __PAGETABLE_PUD_FOLDED |
| 905 | static inline int __pud_alloc(struct mm_struct *mm, pgd_t *pgd, |
| 906 | unsigned long address) |
| 907 | { |
| 908 | return 0; |
| 909 | } |
| 910 | #else |
Hugh Dickins | 1bb3630 | 2005-10-29 18:16:22 -0700 | [diff] [blame] | 911 | 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] | 912 | #endif |
| 913 | |
| 914 | #ifdef __PAGETABLE_PMD_FOLDED |
| 915 | static inline int __pmd_alloc(struct mm_struct *mm, pud_t *pud, |
| 916 | unsigned long address) |
| 917 | { |
| 918 | return 0; |
| 919 | } |
| 920 | #else |
Hugh Dickins | 1bb3630 | 2005-10-29 18:16:22 -0700 | [diff] [blame] | 921 | 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] | 922 | #endif |
| 923 | |
Hugh Dickins | 1bb3630 | 2005-10-29 18:16:22 -0700 | [diff] [blame] | 924 | int __pte_alloc(struct mm_struct *mm, pmd_t *pmd, unsigned long address); |
| 925 | int __pte_alloc_kernel(pmd_t *pmd, unsigned long address); |
| 926 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 927 | /* |
| 928 | * The following ifdef needed to get the 4level-fixup.h header to work. |
| 929 | * Remove it when 4level-fixup.h has been removed. |
| 930 | */ |
Hugh Dickins | 1bb3630 | 2005-10-29 18:16:22 -0700 | [diff] [blame] | 931 | #if defined(CONFIG_MMU) && !defined(__ARCH_HAS_4LEVEL_HACK) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 932 | static inline pud_t *pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address) |
| 933 | { |
Hugh Dickins | 1bb3630 | 2005-10-29 18:16:22 -0700 | [diff] [blame] | 934 | return (unlikely(pgd_none(*pgd)) && __pud_alloc(mm, pgd, address))? |
| 935 | NULL: pud_offset(pgd, address); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 936 | } |
| 937 | |
| 938 | static inline pmd_t *pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address) |
| 939 | { |
Hugh Dickins | 1bb3630 | 2005-10-29 18:16:22 -0700 | [diff] [blame] | 940 | return (unlikely(pud_none(*pud)) && __pmd_alloc(mm, pud, address))? |
| 941 | NULL: pmd_offset(pud, address); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 942 | } |
Hugh Dickins | 1bb3630 | 2005-10-29 18:16:22 -0700 | [diff] [blame] | 943 | #endif /* CONFIG_MMU && !__ARCH_HAS_4LEVEL_HACK */ |
| 944 | |
Jeremy Fitzhardinge | f7d0b92 | 2008-09-09 15:43:22 -0700 | [diff] [blame] | 945 | #if USE_SPLIT_PTLOCKS |
Hugh Dickins | 4c21e2f | 2005-10-29 18:16:40 -0700 | [diff] [blame] | 946 | /* |
| 947 | * We tuck a spinlock to guard each pagetable page into its struct page, |
| 948 | * at page->private, with BUILD_BUG_ON to make sure that this will not |
| 949 | * overflow into the next struct page (as it might with DEBUG_SPINLOCK). |
| 950 | * When freeing, reset page->mapping so free_pages_check won't complain. |
| 951 | */ |
Andrew Morton | 349aef0 | 2006-01-08 01:04:36 -0800 | [diff] [blame] | 952 | #define __pte_lockptr(page) &((page)->ptl) |
Hugh Dickins | 4c21e2f | 2005-10-29 18:16:40 -0700 | [diff] [blame] | 953 | #define pte_lock_init(_page) do { \ |
| 954 | spin_lock_init(__pte_lockptr(_page)); \ |
| 955 | } while (0) |
| 956 | #define pte_lock_deinit(page) ((page)->mapping = NULL) |
| 957 | #define pte_lockptr(mm, pmd) ({(void)(mm); __pte_lockptr(pmd_page(*(pmd)));}) |
Jeremy Fitzhardinge | f7d0b92 | 2008-09-09 15:43:22 -0700 | [diff] [blame] | 958 | #else /* !USE_SPLIT_PTLOCKS */ |
Hugh Dickins | 4c21e2f | 2005-10-29 18:16:40 -0700 | [diff] [blame] | 959 | /* |
| 960 | * We use mm->page_table_lock to guard all pagetable pages of the mm. |
| 961 | */ |
| 962 | #define pte_lock_init(page) do {} while (0) |
| 963 | #define pte_lock_deinit(page) do {} while (0) |
| 964 | #define pte_lockptr(mm, pmd) ({(void)(pmd); &(mm)->page_table_lock;}) |
Jeremy Fitzhardinge | f7d0b92 | 2008-09-09 15:43:22 -0700 | [diff] [blame] | 965 | #endif /* USE_SPLIT_PTLOCKS */ |
Hugh Dickins | 4c21e2f | 2005-10-29 18:16:40 -0700 | [diff] [blame] | 966 | |
Martin Schwidefsky | 2f569af | 2008-02-08 04:22:04 -0800 | [diff] [blame] | 967 | static inline void pgtable_page_ctor(struct page *page) |
| 968 | { |
| 969 | pte_lock_init(page); |
| 970 | inc_zone_page_state(page, NR_PAGETABLE); |
| 971 | } |
| 972 | |
| 973 | static inline void pgtable_page_dtor(struct page *page) |
| 974 | { |
| 975 | pte_lock_deinit(page); |
| 976 | dec_zone_page_state(page, NR_PAGETABLE); |
| 977 | } |
| 978 | |
Hugh Dickins | c74df32 | 2005-10-29 18:16:23 -0700 | [diff] [blame] | 979 | #define pte_offset_map_lock(mm, pmd, address, ptlp) \ |
| 980 | ({ \ |
Hugh Dickins | 4c21e2f | 2005-10-29 18:16:40 -0700 | [diff] [blame] | 981 | spinlock_t *__ptl = pte_lockptr(mm, pmd); \ |
Hugh Dickins | c74df32 | 2005-10-29 18:16:23 -0700 | [diff] [blame] | 982 | pte_t *__pte = pte_offset_map(pmd, address); \ |
| 983 | *(ptlp) = __ptl; \ |
| 984 | spin_lock(__ptl); \ |
| 985 | __pte; \ |
| 986 | }) |
| 987 | |
| 988 | #define pte_unmap_unlock(pte, ptl) do { \ |
| 989 | spin_unlock(ptl); \ |
| 990 | pte_unmap(pte); \ |
| 991 | } while (0) |
| 992 | |
Hugh Dickins | 1bb3630 | 2005-10-29 18:16:22 -0700 | [diff] [blame] | 993 | #define pte_alloc_map(mm, pmd, address) \ |
| 994 | ((unlikely(!pmd_present(*(pmd))) && __pte_alloc(mm, pmd, address))? \ |
| 995 | NULL: pte_offset_map(pmd, address)) |
| 996 | |
Hugh Dickins | c74df32 | 2005-10-29 18:16:23 -0700 | [diff] [blame] | 997 | #define pte_alloc_map_lock(mm, pmd, address, ptlp) \ |
| 998 | ((unlikely(!pmd_present(*(pmd))) && __pte_alloc(mm, pmd, address))? \ |
| 999 | NULL: pte_offset_map_lock(mm, pmd, address, ptlp)) |
| 1000 | |
Hugh Dickins | 1bb3630 | 2005-10-29 18:16:22 -0700 | [diff] [blame] | 1001 | #define pte_alloc_kernel(pmd, address) \ |
| 1002 | ((unlikely(!pmd_present(*(pmd))) && __pte_alloc_kernel(pmd, address))? \ |
| 1003 | NULL: pte_offset_kernel(pmd, address)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1004 | |
| 1005 | extern void free_area_init(unsigned long * zones_size); |
Johannes Weiner | 9109fb7 | 2008-07-23 21:27:20 -0700 | [diff] [blame] | 1006 | extern void free_area_init_node(int nid, unsigned long * zones_size, |
| 1007 | unsigned long zone_start_pfn, unsigned long *zholes_size); |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 1008 | #ifdef CONFIG_ARCH_POPULATES_NODE_MAP |
| 1009 | /* |
| 1010 | * With CONFIG_ARCH_POPULATES_NODE_MAP set, an architecture may initialise its |
| 1011 | * zones, allocate the backing mem_map and account for memory holes in a more |
| 1012 | * architecture independent manner. This is a substitute for creating the |
| 1013 | * zone_sizes[] and zholes_size[] arrays and passing them to |
| 1014 | * free_area_init_node() |
| 1015 | * |
| 1016 | * An architecture is expected to register range of page frames backed by |
| 1017 | * physical memory with add_active_range() before calling |
| 1018 | * free_area_init_nodes() passing in the PFN each zone ends at. At a basic |
| 1019 | * usage, an architecture is expected to do something like |
| 1020 | * |
| 1021 | * unsigned long max_zone_pfns[MAX_NR_ZONES] = {max_dma, max_normal_pfn, |
| 1022 | * max_highmem_pfn}; |
| 1023 | * for_each_valid_physical_page_range() |
| 1024 | * add_active_range(node_id, start_pfn, end_pfn) |
| 1025 | * free_area_init_nodes(max_zone_pfns); |
| 1026 | * |
| 1027 | * If the architecture guarantees that there are no holes in the ranges |
| 1028 | * registered with add_active_range(), free_bootmem_active_regions() |
| 1029 | * will call free_bootmem_node() for each registered physical page range. |
| 1030 | * Similarly sparse_memory_present_with_active_regions() calls |
| 1031 | * memory_present() for each range when SPARSEMEM is enabled. |
| 1032 | * |
| 1033 | * See mm/page_alloc.c for more information on each function exposed by |
| 1034 | * CONFIG_ARCH_POPULATES_NODE_MAP |
| 1035 | */ |
| 1036 | extern void free_area_init_nodes(unsigned long *max_zone_pfn); |
| 1037 | extern void add_active_range(unsigned int nid, unsigned long start_pfn, |
| 1038 | unsigned long end_pfn); |
Yinghai Lu | cc1050b | 2008-06-13 19:08:52 -0700 | [diff] [blame] | 1039 | extern void remove_active_range(unsigned int nid, unsigned long start_pfn, |
| 1040 | unsigned long end_pfn); |
Mel Gorman | fb01439 | 2006-09-27 01:49:59 -0700 | [diff] [blame] | 1041 | extern void push_node_boundaries(unsigned int nid, unsigned long start_pfn, |
| 1042 | unsigned long end_pfn); |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 1043 | extern void remove_all_active_ranges(void); |
| 1044 | extern unsigned long absent_pages_in_range(unsigned long start_pfn, |
| 1045 | unsigned long end_pfn); |
| 1046 | extern void get_pfn_range_for_nid(unsigned int nid, |
| 1047 | unsigned long *start_pfn, unsigned long *end_pfn); |
| 1048 | extern unsigned long find_min_pfn_with_active_regions(void); |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 1049 | extern void free_bootmem_with_active_regions(int nid, |
| 1050 | unsigned long max_low_pfn); |
Yinghai Lu | d52d53b | 2008-06-16 20:10:55 -0700 | [diff] [blame] | 1051 | typedef int (*work_fn_t)(unsigned long, unsigned long, void *); |
Yinghai Lu | b5bc6c0 | 2008-06-14 18:32:52 -0700 | [diff] [blame] | 1052 | extern void work_with_active_regions(int nid, work_fn_t work_fn, void *data); |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 1053 | extern void sparse_memory_present_with_active_regions(int nid); |
| 1054 | #ifndef CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID |
| 1055 | extern int early_pfn_to_nid(unsigned long pfn); |
| 1056 | #endif /* CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID */ |
| 1057 | #endif /* CONFIG_ARCH_POPULATES_NODE_MAP */ |
Mel Gorman | 0e0b864 | 2006-09-27 01:49:56 -0700 | [diff] [blame] | 1058 | extern void set_dma_reserve(unsigned long new_dma_reserve); |
Dave Hansen | a2f3aa0 | 2007-01-10 23:15:30 -0800 | [diff] [blame] | 1059 | extern void memmap_init_zone(unsigned long, int, unsigned long, |
| 1060 | unsigned long, enum memmap_context); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 1061 | extern void setup_per_zone_pages_min(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1062 | extern void mem_init(void); |
| 1063 | extern void show_mem(void); |
| 1064 | extern void si_meminfo(struct sysinfo * val); |
| 1065 | extern void si_meminfo_node(struct sysinfo *val, int nid); |
Mike Travis | 3461b0a | 2008-05-12 21:21:13 +0200 | [diff] [blame] | 1066 | extern int after_bootmem; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1067 | |
Christoph Lameter | e7c8d5c | 2005-06-21 17:14:47 -0700 | [diff] [blame] | 1068 | #ifdef CONFIG_NUMA |
| 1069 | extern void setup_per_cpu_pageset(void); |
| 1070 | #else |
| 1071 | static inline void setup_per_cpu_pageset(void) {} |
| 1072 | #endif |
| 1073 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1074 | /* prio_tree.c */ |
| 1075 | void vma_prio_tree_add(struct vm_area_struct *, struct vm_area_struct *old); |
| 1076 | void vma_prio_tree_insert(struct vm_area_struct *, struct prio_tree_root *); |
| 1077 | void vma_prio_tree_remove(struct vm_area_struct *, struct prio_tree_root *); |
| 1078 | struct vm_area_struct *vma_prio_tree_next(struct vm_area_struct *vma, |
| 1079 | struct prio_tree_iter *iter); |
| 1080 | |
| 1081 | #define vma_prio_tree_foreach(vma, iter, root, begin, end) \ |
| 1082 | for (prio_tree_iter_init(iter, root, begin, end), vma = NULL; \ |
| 1083 | (vma = vma_prio_tree_next(vma, iter)); ) |
| 1084 | |
| 1085 | static inline void vma_nonlinear_insert(struct vm_area_struct *vma, |
| 1086 | struct list_head *list) |
| 1087 | { |
| 1088 | vma->shared.vm_set.parent = NULL; |
| 1089 | list_add_tail(&vma->shared.vm_set.list, list); |
| 1090 | } |
| 1091 | |
| 1092 | /* mmap.c */ |
Alan Cox | 34b4e4a | 2007-08-22 14:01:28 -0700 | [diff] [blame] | 1093 | 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] | 1094 | extern void vma_adjust(struct vm_area_struct *vma, unsigned long start, |
| 1095 | unsigned long end, pgoff_t pgoff, struct vm_area_struct *insert); |
| 1096 | extern struct vm_area_struct *vma_merge(struct mm_struct *, |
| 1097 | struct vm_area_struct *prev, unsigned long addr, unsigned long end, |
| 1098 | unsigned long vm_flags, struct anon_vma *, struct file *, pgoff_t, |
| 1099 | struct mempolicy *); |
| 1100 | extern struct anon_vma *find_mergeable_anon_vma(struct vm_area_struct *); |
| 1101 | extern int split_vma(struct mm_struct *, |
| 1102 | struct vm_area_struct *, unsigned long addr, int new_below); |
| 1103 | extern int insert_vm_struct(struct mm_struct *, struct vm_area_struct *); |
| 1104 | extern void __vma_link_rb(struct mm_struct *, struct vm_area_struct *, |
| 1105 | struct rb_node **, struct rb_node *); |
Hugh Dickins | a8fb561 | 2005-10-29 18:15:57 -0700 | [diff] [blame] | 1106 | extern void unlink_file_vma(struct vm_area_struct *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1107 | extern struct vm_area_struct *copy_vma(struct vm_area_struct **, |
| 1108 | unsigned long addr, unsigned long len, pgoff_t pgoff); |
| 1109 | extern void exit_mmap(struct mm_struct *); |
Matt Helsley | 925d1c4 | 2008-04-29 01:01:36 -0700 | [diff] [blame] | 1110 | |
Andrea Arcangeli | 7906d00 | 2008-07-28 15:46:26 -0700 | [diff] [blame] | 1111 | extern int mm_take_all_locks(struct mm_struct *mm); |
| 1112 | extern void mm_drop_all_locks(struct mm_struct *mm); |
| 1113 | |
Matt Helsley | 925d1c4 | 2008-04-29 01:01:36 -0700 | [diff] [blame] | 1114 | #ifdef CONFIG_PROC_FS |
| 1115 | /* From fs/proc/base.c. callers must _not_ hold the mm's exe_file_lock */ |
| 1116 | extern void added_exe_file_vma(struct mm_struct *mm); |
| 1117 | extern void removed_exe_file_vma(struct mm_struct *mm); |
| 1118 | #else |
| 1119 | static inline void added_exe_file_vma(struct mm_struct *mm) |
| 1120 | {} |
| 1121 | |
| 1122 | static inline void removed_exe_file_vma(struct mm_struct *mm) |
| 1123 | {} |
| 1124 | #endif /* CONFIG_PROC_FS */ |
| 1125 | |
akpm@osdl.org | 119f657 | 2005-05-01 08:58:35 -0700 | [diff] [blame] | 1126 | extern int may_expand_vm(struct mm_struct *mm, unsigned long npages); |
Roland McGrath | fa5dc22 | 2007-02-08 14:20:41 -0800 | [diff] [blame] | 1127 | extern int install_special_mapping(struct mm_struct *mm, |
| 1128 | unsigned long addr, unsigned long len, |
| 1129 | unsigned long flags, struct page **pages); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1130 | |
| 1131 | extern unsigned long get_unmapped_area(struct file *, unsigned long, unsigned long, unsigned long, unsigned long); |
| 1132 | |
| 1133 | extern unsigned long do_mmap_pgoff(struct file *file, unsigned long addr, |
| 1134 | unsigned long len, unsigned long prot, |
| 1135 | unsigned long flag, unsigned long pgoff); |
Miklos Szeredi | 0165ab4 | 2007-07-15 23:38:26 -0700 | [diff] [blame] | 1136 | extern unsigned long mmap_region(struct file *file, unsigned long addr, |
| 1137 | unsigned long len, unsigned long flags, |
| 1138 | unsigned int vm_flags, unsigned long pgoff, |
| 1139 | int accountable); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1140 | |
| 1141 | static inline unsigned long do_mmap(struct file *file, unsigned long addr, |
| 1142 | unsigned long len, unsigned long prot, |
| 1143 | unsigned long flag, unsigned long offset) |
| 1144 | { |
| 1145 | unsigned long ret = -EINVAL; |
| 1146 | if ((offset + PAGE_ALIGN(len)) < offset) |
| 1147 | goto out; |
| 1148 | if (!(offset & ~PAGE_MASK)) |
| 1149 | ret = do_mmap_pgoff(file, addr, len, prot, flag, offset >> PAGE_SHIFT); |
| 1150 | out: |
| 1151 | return ret; |
| 1152 | } |
| 1153 | |
| 1154 | extern int do_munmap(struct mm_struct *, unsigned long, size_t); |
| 1155 | |
| 1156 | extern unsigned long do_brk(unsigned long, unsigned long); |
| 1157 | |
| 1158 | /* filemap.c */ |
| 1159 | extern unsigned long page_unuse(struct page *); |
| 1160 | extern void truncate_inode_pages(struct address_space *, loff_t); |
Hans Reiser | d733907 | 2006-01-06 00:10:36 -0800 | [diff] [blame] | 1161 | extern void truncate_inode_pages_range(struct address_space *, |
| 1162 | loff_t lstart, loff_t lend); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1163 | |
| 1164 | /* generic vm_area_ops exported for stackable file systems */ |
Nick Piggin | d0217ac | 2007-07-19 01:47:03 -0700 | [diff] [blame] | 1165 | extern int filemap_fault(struct vm_area_struct *, struct vm_fault *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1166 | |
| 1167 | /* mm/page-writeback.c */ |
| 1168 | int write_one_page(struct page *page, int wait); |
| 1169 | |
| 1170 | /* readahead.c */ |
| 1171 | #define VM_MAX_READAHEAD 128 /* kbytes */ |
| 1172 | #define VM_MIN_READAHEAD 16 /* kbytes (includes current page) */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1173 | |
| 1174 | int do_page_cache_readahead(struct address_space *mapping, struct file *filp, |
Andrew Morton | 7361f4d | 2005-11-07 00:59:28 -0800 | [diff] [blame] | 1175 | pgoff_t offset, unsigned long nr_to_read); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1176 | int force_page_cache_readahead(struct address_space *mapping, struct file *filp, |
Andrew Morton | 7361f4d | 2005-11-07 00:59:28 -0800 | [diff] [blame] | 1177 | pgoff_t offset, unsigned long nr_to_read); |
Rusty Russell | cf914a7 | 2007-07-19 01:48:08 -0700 | [diff] [blame] | 1178 | |
| 1179 | void page_cache_sync_readahead(struct address_space *mapping, |
| 1180 | struct file_ra_state *ra, |
| 1181 | struct file *filp, |
| 1182 | pgoff_t offset, |
| 1183 | unsigned long size); |
| 1184 | |
| 1185 | void page_cache_async_readahead(struct address_space *mapping, |
| 1186 | struct file_ra_state *ra, |
| 1187 | struct file *filp, |
| 1188 | struct page *pg, |
| 1189 | pgoff_t offset, |
| 1190 | unsigned long size); |
| 1191 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1192 | unsigned long max_sane_readahead(unsigned long nr); |
| 1193 | |
| 1194 | /* Do stack extension */ |
Hugh Dickins | 46dea3d | 2005-10-29 18:16:20 -0700 | [diff] [blame] | 1195 | extern int expand_stack(struct vm_area_struct *vma, unsigned long address); |
Matthew Wilcox | 9ab8851 | 2005-11-18 16:16:42 -0500 | [diff] [blame] | 1196 | #ifdef CONFIG_IA64 |
Hugh Dickins | 46dea3d | 2005-10-29 18:16:20 -0700 | [diff] [blame] | 1197 | extern int expand_upwards(struct vm_area_struct *vma, unsigned long address); |
Matthew Wilcox | 9ab8851 | 2005-11-18 16:16:42 -0500 | [diff] [blame] | 1198 | #endif |
Ollie Wild | b6a2fea | 2007-07-19 01:48:16 -0700 | [diff] [blame] | 1199 | extern int expand_stack_downwards(struct vm_area_struct *vma, |
| 1200 | unsigned long address); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1201 | |
| 1202 | /* Look up the first VMA which satisfies addr < vm_end, NULL if none. */ |
| 1203 | extern struct vm_area_struct * find_vma(struct mm_struct * mm, unsigned long addr); |
| 1204 | extern struct vm_area_struct * find_vma_prev(struct mm_struct * mm, unsigned long addr, |
| 1205 | struct vm_area_struct **pprev); |
| 1206 | |
| 1207 | /* Look up the first VMA which intersects the interval start_addr..end_addr-1, |
| 1208 | NULL if none. Assume start_addr < end_addr. */ |
| 1209 | static inline struct vm_area_struct * find_vma_intersection(struct mm_struct * mm, unsigned long start_addr, unsigned long end_addr) |
| 1210 | { |
| 1211 | struct vm_area_struct * vma = find_vma(mm,start_addr); |
| 1212 | |
| 1213 | if (vma && end_addr <= vma->vm_start) |
| 1214 | vma = NULL; |
| 1215 | return vma; |
| 1216 | } |
| 1217 | |
| 1218 | static inline unsigned long vma_pages(struct vm_area_struct *vma) |
| 1219 | { |
| 1220 | return (vma->vm_end - vma->vm_start) >> PAGE_SHIFT; |
| 1221 | } |
| 1222 | |
Hugh Dickins | 804af2c | 2006-07-26 21:39:49 +0100 | [diff] [blame] | 1223 | pgprot_t vm_get_page_prot(unsigned long vm_flags); |
Hugh Dickins | deceb6c | 2005-10-29 18:16:33 -0700 | [diff] [blame] | 1224 | struct vm_area_struct *find_extend_vma(struct mm_struct *, unsigned long addr); |
Hugh Dickins | deceb6c | 2005-10-29 18:16:33 -0700 | [diff] [blame] | 1225 | int remap_pfn_range(struct vm_area_struct *, unsigned long addr, |
| 1226 | unsigned long pfn, unsigned long size, pgprot_t); |
Linus Torvalds | a145dd4 | 2005-11-30 09:35:19 -0800 | [diff] [blame] | 1227 | 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] | 1228 | int vm_insert_pfn(struct vm_area_struct *vma, unsigned long addr, |
| 1229 | unsigned long pfn); |
Nick Piggin | 423bad6 | 2008-04-28 02:13:01 -0700 | [diff] [blame] | 1230 | int vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr, |
| 1231 | unsigned long pfn); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1232 | |
Linus Torvalds | 6aab341 | 2005-11-28 14:34:23 -0800 | [diff] [blame] | 1233 | struct page *follow_page(struct vm_area_struct *, unsigned long address, |
Hugh Dickins | deceb6c | 2005-10-29 18:16:33 -0700 | [diff] [blame] | 1234 | unsigned int foll_flags); |
| 1235 | #define FOLL_WRITE 0x01 /* check pte is writable */ |
| 1236 | #define FOLL_TOUCH 0x02 /* mark page accessed */ |
| 1237 | #define FOLL_GET 0x04 /* do get_page on page */ |
| 1238 | #define FOLL_ANON 0x08 /* give ZERO_PAGE if no pgtable */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1239 | |
venkatesh.pallipadi@intel.com | e121e41 | 2008-12-18 11:41:28 -0800 | [diff] [blame] | 1240 | int follow_pfnmap_pte(struct vm_area_struct *vma, |
| 1241 | unsigned long address, pte_t *ret_ptep); |
| 1242 | |
Martin Schwidefsky | 2f569af | 2008-02-08 04:22:04 -0800 | [diff] [blame] | 1243 | typedef int (*pte_fn_t)(pte_t *pte, pgtable_t token, unsigned long addr, |
Jeremy Fitzhardinge | aee16b3 | 2007-05-06 14:48:54 -0700 | [diff] [blame] | 1244 | void *data); |
| 1245 | extern int apply_to_page_range(struct mm_struct *mm, unsigned long address, |
| 1246 | unsigned long size, pte_fn_t fn, void *data); |
| 1247 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1248 | #ifdef CONFIG_PROC_FS |
Hugh Dickins | ab50b8e | 2005-10-29 18:15:56 -0700 | [diff] [blame] | 1249 | void vm_stat_account(struct mm_struct *, unsigned long, struct file *, long); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1250 | #else |
Hugh Dickins | ab50b8e | 2005-10-29 18:15:56 -0700 | [diff] [blame] | 1251 | static inline void vm_stat_account(struct mm_struct *mm, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1252 | unsigned long flags, struct file *file, long pages) |
| 1253 | { |
| 1254 | } |
| 1255 | #endif /* CONFIG_PROC_FS */ |
| 1256 | |
Ingo Molnar | 12d6f21 | 2008-01-30 13:33:58 +0100 | [diff] [blame] | 1257 | #ifdef CONFIG_DEBUG_PAGEALLOC |
| 1258 | extern int debug_pagealloc_enabled; |
| 1259 | |
| 1260 | extern void kernel_map_pages(struct page *page, int numpages, int enable); |
| 1261 | |
| 1262 | static inline void enable_debug_pagealloc(void) |
| 1263 | { |
| 1264 | debug_pagealloc_enabled = 1; |
| 1265 | } |
Rafael J. Wysocki | 8a235ef | 2008-02-20 01:47:44 +0100 | [diff] [blame] | 1266 | #ifdef CONFIG_HIBERNATION |
| 1267 | extern bool kernel_page_present(struct page *page); |
| 1268 | #endif /* CONFIG_HIBERNATION */ |
Ingo Molnar | 12d6f21 | 2008-01-30 13:33:58 +0100 | [diff] [blame] | 1269 | #else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1270 | static inline void |
Nick Piggin | 9858db5 | 2006-10-11 01:21:30 -0700 | [diff] [blame] | 1271 | kernel_map_pages(struct page *page, int numpages, int enable) {} |
Ingo Molnar | 12d6f21 | 2008-01-30 13:33:58 +0100 | [diff] [blame] | 1272 | static inline void enable_debug_pagealloc(void) |
| 1273 | { |
| 1274 | } |
Rafael J. Wysocki | 8a235ef | 2008-02-20 01:47:44 +0100 | [diff] [blame] | 1275 | #ifdef CONFIG_HIBERNATION |
| 1276 | static inline bool kernel_page_present(struct page *page) { return true; } |
| 1277 | #endif /* CONFIG_HIBERNATION */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1278 | #endif |
| 1279 | |
| 1280 | extern struct vm_area_struct *get_gate_vma(struct task_struct *tsk); |
| 1281 | #ifdef __HAVE_ARCH_GATE_AREA |
| 1282 | int in_gate_area_no_task(unsigned long addr); |
| 1283 | int in_gate_area(struct task_struct *task, unsigned long addr); |
| 1284 | #else |
| 1285 | int in_gate_area_no_task(unsigned long addr); |
| 1286 | #define in_gate_area(task, addr) ({(void)task; in_gate_area_no_task(addr);}) |
| 1287 | #endif /* __HAVE_ARCH_GATE_AREA */ |
| 1288 | |
Andrew Morton | 9d0243b | 2006-01-08 01:00:39 -0800 | [diff] [blame] | 1289 | int drop_caches_sysctl_handler(struct ctl_table *, int, struct file *, |
| 1290 | void __user *, size_t *, loff_t *); |
Andrew Morton | 69e0594 | 2006-03-22 00:08:19 -0800 | [diff] [blame] | 1291 | unsigned long shrink_slab(unsigned long scanned, gfp_t gfp_mask, |
Andrew Morton | 9d0243b | 2006-01-08 01:00:39 -0800 | [diff] [blame] | 1292 | unsigned long lru_pages); |
Andrew Morton | 9d0243b | 2006-01-08 01:00:39 -0800 | [diff] [blame] | 1293 | |
Luke Yang | 7a9166e | 2006-02-20 18:28:07 -0800 | [diff] [blame] | 1294 | #ifndef CONFIG_MMU |
| 1295 | #define randomize_va_space 0 |
| 1296 | #else |
Andi Kleen | a62eaf1 | 2006-02-16 23:41:58 +0100 | [diff] [blame] | 1297 | extern int randomize_va_space; |
Luke Yang | 7a9166e | 2006-02-20 18:28:07 -0800 | [diff] [blame] | 1298 | #endif |
Andi Kleen | a62eaf1 | 2006-02-16 23:41:58 +0100 | [diff] [blame] | 1299 | |
Sam Ravnborg | 045e72a | 2007-07-26 10:41:13 -0700 | [diff] [blame] | 1300 | const char * arch_vma_name(struct vm_area_struct *vma); |
Andi Kleen | 0325291 | 2008-01-30 13:33:18 +0100 | [diff] [blame] | 1301 | void print_vma_addr(char *prefix, unsigned long rip); |
Ingo Molnar | e6e5494 | 2006-06-27 02:53:50 -0700 | [diff] [blame] | 1302 | |
Yasunori Goto | 98f3cfc | 2007-10-16 01:26:14 -0700 | [diff] [blame] | 1303 | struct page *sparse_mem_map_populate(unsigned long pnum, int nid); |
Andy Whitcroft | 29c7111 | 2007-10-16 01:24:14 -0700 | [diff] [blame] | 1304 | pgd_t *vmemmap_pgd_populate(unsigned long addr, int node); |
| 1305 | pud_t *vmemmap_pud_populate(pgd_t *pgd, unsigned long addr, int node); |
| 1306 | pmd_t *vmemmap_pmd_populate(pud_t *pud, unsigned long addr, int node); |
| 1307 | 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] | 1308 | void *vmemmap_alloc_block(unsigned long size, int node); |
| 1309 | void vmemmap_verify(pte_t *, int, unsigned long, unsigned long); |
Andy Whitcroft | 29c7111 | 2007-10-16 01:24:14 -0700 | [diff] [blame] | 1310 | int vmemmap_populate_basepages(struct page *start_page, |
| 1311 | unsigned long pages, int node); |
| 1312 | int vmemmap_populate(struct page *start_page, unsigned long pages, int node); |
Yinghai Lu | c2b91e2 | 2008-04-12 01:19:24 -0700 | [diff] [blame] | 1313 | void vmemmap_populate_print_last(void); |
Christoph Lameter | 8f6aac4 | 2007-10-16 01:24:13 -0700 | [diff] [blame] | 1314 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1315 | #endif /* __KERNEL__ */ |
| 1316 | #endif /* _LINUX_MM_H */ |