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; |
Markus Metzger | 1cb81b1 | 2009-04-24 09:51:43 +0200 | [diff] [blame] | 22 | struct rlimit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | |
| 24 | #ifndef CONFIG_DISCONTIGMEM /* Don't use mapnrs, do it properly */ |
| 25 | extern unsigned long max_mapnr; |
| 26 | #endif |
| 27 | |
| 28 | extern unsigned long num_physpages; |
| 29 | extern void * high_memory; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | extern int page_cluster; |
| 31 | |
| 32 | #ifdef CONFIG_SYSCTL |
| 33 | extern int sysctl_legacy_va_layout; |
| 34 | #else |
| 35 | #define sysctl_legacy_va_layout 0 |
| 36 | #endif |
| 37 | |
James Morris | 42d7896 | 2007-12-26 15:12:37 +1100 | [diff] [blame] | 38 | extern unsigned long mmap_min_addr; |
| 39 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | #include <asm/page.h> |
| 41 | #include <asm/pgtable.h> |
| 42 | #include <asm/processor.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | #define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n)) |
| 45 | |
Andrea Righi | 27ac792 | 2008-07-23 21:28:13 -0700 | [diff] [blame] | 46 | /* to align the pointer to the (next) page boundary */ |
| 47 | #define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE) |
| 48 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | /* |
| 50 | * Linux kernel virtual memory manager primitives. |
| 51 | * The idea being to have a "virtual" mm in the same way |
| 52 | * we have a virtual fs - giving a cleaner interface to the |
| 53 | * mm details, and allowing different kinds of memory mappings |
| 54 | * (from shared memory to executable loading to arbitrary |
| 55 | * mmap() functions). |
| 56 | */ |
| 57 | |
Christoph Lameter | c43692e | 2006-12-06 20:32:48 -0800 | [diff] [blame] | 58 | extern struct kmem_cache *vm_area_cachep; |
| 59 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | #ifndef CONFIG_MMU |
David Howells | 8feae13 | 2009-01-08 12:04:47 +0000 | [diff] [blame] | 61 | extern struct rb_root nommu_region_tree; |
| 62 | extern struct rw_semaphore nommu_region_sem; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | |
| 64 | extern unsigned int kobjsize(const void *objp); |
| 65 | #endif |
| 66 | |
| 67 | /* |
Hugh Dickins | 605d928 | 2008-08-16 11:07:21 +0100 | [diff] [blame] | 68 | * vm_flags in vm_area_struct, see mm_types.h. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | */ |
| 70 | #define VM_READ 0x00000001 /* currently active flags */ |
| 71 | #define VM_WRITE 0x00000002 |
| 72 | #define VM_EXEC 0x00000004 |
| 73 | #define VM_SHARED 0x00000008 |
| 74 | |
Paolo 'Blaisorblade' Giarrusso | 7e2cff4 | 2005-09-21 09:55:39 -0700 | [diff] [blame] | 75 | /* 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] | 76 | #define VM_MAYREAD 0x00000010 /* limits for mprotect() etc */ |
| 77 | #define VM_MAYWRITE 0x00000020 |
| 78 | #define VM_MAYEXEC 0x00000040 |
| 79 | #define VM_MAYSHARE 0x00000080 |
| 80 | |
| 81 | #define VM_GROWSDOWN 0x00000100 /* general info on the segment */ |
| 82 | #define VM_GROWSUP 0x00000200 |
Linus Torvalds | 6aab341 | 2005-11-28 14:34:23 -0800 | [diff] [blame] | 83 | #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] | 84 | #define VM_DENYWRITE 0x00000800 /* ETXTBSY on write attempts.. */ |
| 85 | |
| 86 | #define VM_EXECUTABLE 0x00001000 |
| 87 | #define VM_LOCKED 0x00002000 |
| 88 | #define VM_IO 0x00004000 /* Memory mapped I/O or similar */ |
| 89 | |
| 90 | /* Used by sys_madvise() */ |
| 91 | #define VM_SEQ_READ 0x00008000 /* App will access data sequentially */ |
| 92 | #define VM_RAND_READ 0x00010000 /* App will not benefit from clustered reads */ |
| 93 | |
| 94 | #define VM_DONTCOPY 0x00020000 /* Do not copy this vma on fork */ |
| 95 | #define VM_DONTEXPAND 0x00040000 /* Cannot expand with mremap() */ |
Hugh Dickins | 0b14c17 | 2005-11-21 21:32:15 -0800 | [diff] [blame] | 96 | #define VM_RESERVED 0x00080000 /* Count as reserved_vm like IO */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | #define VM_ACCOUNT 0x00100000 /* Is a VM accounted object */ |
Andy Whitcroft | cdfd432 | 2008-07-23 21:27:28 -0700 | [diff] [blame] | 98 | #define VM_NORESERVE 0x00200000 /* should the VM suppress accounting */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | #define VM_HUGETLB 0x00400000 /* Huge TLB Page VM */ |
| 100 | #define VM_NONLINEAR 0x00800000 /* Is non-linear (remap_file_pages) */ |
| 101 | #define VM_MAPPED_COPY 0x01000000 /* T if mapped copy of data (nommu mmap) */ |
Pallipadi, Venkatesh | 895791d | 2009-03-13 16:35:44 -0700 | [diff] [blame] | 102 | #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] | 103 | #define VM_ALWAYSDUMP 0x04000000 /* Always include in core dumps */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | |
Nick Piggin | d0217ac | 2007-07-19 01:47:03 -0700 | [diff] [blame] | 105 | #define VM_CAN_NONLINEAR 0x08000000 /* Has ->fault & does nonlinear pages */ |
Jared Hulbert | b379d79 | 2008-04-28 02:12:58 -0700 | [diff] [blame] | 106 | #define VM_MIXEDMAP 0x10000000 /* Can contain "struct page" and pure PFN pages */ |
Dave Kleikamp | aba46c5 | 2008-07-08 00:28:52 +1000 | [diff] [blame] | 107 | #define VM_SAO 0x20000000 /* Strong Access Ordering (powerpc) */ |
Pallipadi, Venkatesh | 895791d | 2009-03-13 16:35:44 -0700 | [diff] [blame] | 108 | #define VM_PFN_AT_MMAP 0x40000000 /* PFNMAP vma that is fully mapped at mmap time */ |
Nick Piggin | d00806b | 2007-07-19 01:46:57 -0700 | [diff] [blame] | 109 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | #ifndef VM_STACK_DEFAULT_FLAGS /* arch can override this */ |
| 111 | #define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS |
| 112 | #endif |
| 113 | |
| 114 | #ifdef CONFIG_STACK_GROWSUP |
| 115 | #define VM_STACK_FLAGS (VM_GROWSUP | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT) |
| 116 | #else |
| 117 | #define VM_STACK_FLAGS (VM_GROWSDOWN | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT) |
| 118 | #endif |
| 119 | |
| 120 | #define VM_READHINTMASK (VM_SEQ_READ | VM_RAND_READ) |
| 121 | #define VM_ClearReadHint(v) (v)->vm_flags &= ~VM_READHINTMASK |
| 122 | #define VM_NormalReadHint(v) (!((v)->vm_flags & VM_READHINTMASK)) |
| 123 | #define VM_SequentialReadHint(v) ((v)->vm_flags & VM_SEQ_READ) |
| 124 | #define VM_RandomReadHint(v) ((v)->vm_flags & VM_RAND_READ) |
| 125 | |
| 126 | /* |
Nick Piggin | b291f00 | 2008-10-18 20:26:44 -0700 | [diff] [blame] | 127 | * special vmas that are non-mergable, non-mlock()able |
| 128 | */ |
| 129 | #define VM_SPECIAL (VM_IO | VM_DONTEXPAND | VM_RESERVED | VM_PFNMAP) |
| 130 | |
| 131 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | * mapping from the currently active vm_flags protection bits (the |
| 133 | * low four bits) to a page protection mask.. |
| 134 | */ |
| 135 | extern pgprot_t protection_map[16]; |
| 136 | |
Nick Piggin | d0217ac | 2007-07-19 01:47:03 -0700 | [diff] [blame] | 137 | #define FAULT_FLAG_WRITE 0x01 /* Fault was a write access */ |
| 138 | #define FAULT_FLAG_NONLINEAR 0x02 /* Fault was via a nonlinear mapping */ |
Nick Piggin | c2ec175 | 2009-03-31 15:23:21 -0700 | [diff] [blame] | 139 | #define FAULT_FLAG_MKWRITE 0x04 /* Fault was mkwrite of existing pte */ |
Nick Piggin | d0217ac | 2007-07-19 01:47:03 -0700 | [diff] [blame] | 140 | |
venkatesh.pallipadi@intel.com | 6bd9cd5 | 2008-12-19 13:47:26 -0800 | [diff] [blame] | 141 | /* |
| 142 | * This interface is used by x86 PAT code to identify a pfn mapping that is |
| 143 | * linear over entire vma. This is to optimize PAT code that deals with |
| 144 | * marking the physical region with a particular prot. This is not for generic |
| 145 | * mm use. Note also that this check will not work if the pfn mapping is |
| 146 | * linear for a vma starting at physical address 0. In which case PAT code |
| 147 | * falls back to slow path of reserving physical range page by page. |
| 148 | */ |
venkatesh.pallipadi@intel.com | 3c8bb73 | 2008-12-18 11:41:27 -0800 | [diff] [blame] | 149 | static inline int is_linear_pfn_mapping(struct vm_area_struct *vma) |
| 150 | { |
Pallipadi, Venkatesh | 895791d | 2009-03-13 16:35:44 -0700 | [diff] [blame] | 151 | return (vma->vm_flags & VM_PFN_AT_MMAP); |
venkatesh.pallipadi@intel.com | 3c8bb73 | 2008-12-18 11:41:27 -0800 | [diff] [blame] | 152 | } |
| 153 | |
| 154 | static inline int is_pfn_mapping(struct vm_area_struct *vma) |
| 155 | { |
| 156 | return (vma->vm_flags & VM_PFNMAP); |
| 157 | } |
Nick Piggin | d0217ac | 2007-07-19 01:47:03 -0700 | [diff] [blame] | 158 | |
Nick Piggin | 54cb882 | 2007-07-19 01:46:59 -0700 | [diff] [blame] | 159 | /* |
Nick Piggin | d0217ac | 2007-07-19 01:47:03 -0700 | [diff] [blame] | 160 | * 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] | 161 | * ->fault function. The vma's ->fault is responsible for returning a bitmask |
| 162 | * 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] | 163 | * |
Nick Piggin | d0217ac | 2007-07-19 01:47:03 -0700 | [diff] [blame] | 164 | * pgoff should be used in favour of virtual_address, if possible. If pgoff |
| 165 | * is used, one may set VM_CAN_NONLINEAR in the vma->vm_flags to get nonlinear |
| 166 | * mapping support. |
Nick Piggin | 54cb882 | 2007-07-19 01:46:59 -0700 | [diff] [blame] | 167 | */ |
Nick Piggin | d0217ac | 2007-07-19 01:47:03 -0700 | [diff] [blame] | 168 | struct vm_fault { |
| 169 | unsigned int flags; /* FAULT_FLAG_xxx flags */ |
| 170 | pgoff_t pgoff; /* Logical page offset based on vma */ |
| 171 | void __user *virtual_address; /* Faulting virtual address */ |
| 172 | |
| 173 | struct page *page; /* ->fault handlers should return a |
Nick Piggin | 83c5407 | 2007-07-19 01:47:05 -0700 | [diff] [blame] | 174 | * page here, unless VM_FAULT_NOPAGE |
Nick Piggin | d0217ac | 2007-07-19 01:47:03 -0700 | [diff] [blame] | 175 | * is set (which is also implied by |
Nick Piggin | 83c5407 | 2007-07-19 01:47:05 -0700 | [diff] [blame] | 176 | * VM_FAULT_ERROR). |
Nick Piggin | d0217ac | 2007-07-19 01:47:03 -0700 | [diff] [blame] | 177 | */ |
Nick Piggin | 54cb882 | 2007-07-19 01:46:59 -0700 | [diff] [blame] | 178 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | |
| 180 | /* |
| 181 | * These are the virtual MM functions - opening of an area, closing and |
| 182 | * unmapping it (needed to keep files on disk up-to-date etc), pointer |
| 183 | * to the functions called when a no-page or a wp-page exception occurs. |
| 184 | */ |
| 185 | struct vm_operations_struct { |
| 186 | void (*open)(struct vm_area_struct * area); |
| 187 | void (*close)(struct vm_area_struct * area); |
Nick Piggin | d0217ac | 2007-07-19 01:47:03 -0700 | [diff] [blame] | 188 | int (*fault)(struct vm_area_struct *vma, struct vm_fault *vmf); |
David Howells | 9637a5e | 2006-06-23 02:03:43 -0700 | [diff] [blame] | 189 | |
| 190 | /* notification that a previously read-only page is about to become |
| 191 | * writable, if an error is returned it will cause a SIGBUS */ |
Nick Piggin | c2ec175 | 2009-03-31 15:23:21 -0700 | [diff] [blame] | 192 | int (*page_mkwrite)(struct vm_area_struct *vma, struct vm_fault *vmf); |
Rik van Riel | 28b2ee2 | 2008-07-23 21:27:05 -0700 | [diff] [blame] | 193 | |
| 194 | /* called by access_process_vm when get_user_pages() fails, typically |
| 195 | * for use by special VMAs that can switch between memory and hardware |
| 196 | */ |
| 197 | int (*access)(struct vm_area_struct *vma, unsigned long addr, |
| 198 | void *buf, int len, int write); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | #ifdef CONFIG_NUMA |
Lee Schermerhorn | a6020ed | 2008-04-28 02:13:14 -0700 | [diff] [blame] | 200 | /* |
| 201 | * set_policy() op must add a reference to any non-NULL @new mempolicy |
| 202 | * to hold the policy upon return. Caller should pass NULL @new to |
| 203 | * remove a policy and fall back to surrounding context--i.e. do not |
| 204 | * install a MPOL_DEFAULT policy, nor the task or system default |
| 205 | * mempolicy. |
| 206 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | int (*set_policy)(struct vm_area_struct *vma, struct mempolicy *new); |
Lee Schermerhorn | a6020ed | 2008-04-28 02:13:14 -0700 | [diff] [blame] | 208 | |
| 209 | /* |
| 210 | * get_policy() op must add reference [mpol_get()] to any policy at |
| 211 | * (vma,addr) marked as MPOL_SHARED. The shared policy infrastructure |
| 212 | * in mm/mempolicy.c will do this automatically. |
| 213 | * get_policy() must NOT add a ref if the policy at (vma,addr) is not |
| 214 | * marked as MPOL_SHARED. vma policies are protected by the mmap_sem. |
| 215 | * If no [shared/vma] mempolicy exists at the addr, get_policy() op |
| 216 | * must return NULL--i.e., do not "fallback" to task or system default |
| 217 | * policy. |
| 218 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | struct mempolicy *(*get_policy)(struct vm_area_struct *vma, |
| 220 | unsigned long addr); |
Christoph Lameter | 7b2259b | 2006-06-25 05:46:48 -0700 | [diff] [blame] | 221 | int (*migrate)(struct vm_area_struct *vma, const nodemask_t *from, |
| 222 | const nodemask_t *to, unsigned long flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | #endif |
| 224 | }; |
| 225 | |
| 226 | struct mmu_gather; |
| 227 | struct inode; |
| 228 | |
Andrew Morton | 349aef0 | 2006-01-08 01:04:36 -0800 | [diff] [blame] | 229 | #define page_private(page) ((page)->private) |
| 230 | #define set_page_private(page, v) ((page)->private = (v)) |
Hugh Dickins | 4c21e2f | 2005-10-29 18:16:40 -0700 | [diff] [blame] | 231 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | /* |
| 233 | * FIXME: take this include out, include page-flags.h in |
| 234 | * files which need it (119 of them) |
| 235 | */ |
| 236 | #include <linux/page-flags.h> |
| 237 | |
| 238 | /* |
| 239 | * Methods to modify the page usage count. |
| 240 | * |
| 241 | * What counts for a page usage: |
| 242 | * - cache mapping (page->mapping) |
| 243 | * - private data (page->private) |
| 244 | * - page mapped in a task's page tables, each mapping |
| 245 | * is counted separately |
| 246 | * |
| 247 | * Also, many kernel routines increase the page count before a critical |
| 248 | * 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] | 249 | */ |
| 250 | |
| 251 | /* |
Nick Piggin | da6052f | 2006-09-25 23:31:35 -0700 | [diff] [blame] | 252 | * 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] | 253 | */ |
Nick Piggin | 7c8ee9a | 2006-03-22 00:08:03 -0800 | [diff] [blame] | 254 | static inline int put_page_testzero(struct page *page) |
| 255 | { |
Nick Piggin | 725d704 | 2006-09-25 23:30:55 -0700 | [diff] [blame] | 256 | VM_BUG_ON(atomic_read(&page->_count) == 0); |
Nick Piggin | 8dc04ef | 2006-03-22 00:08:03 -0800 | [diff] [blame] | 257 | return atomic_dec_and_test(&page->_count); |
Nick Piggin | 7c8ee9a | 2006-03-22 00:08:03 -0800 | [diff] [blame] | 258 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | |
| 260 | /* |
Nick Piggin | 7c8ee9a | 2006-03-22 00:08:03 -0800 | [diff] [blame] | 261 | * Try to grab a ref unless the page has a refcount of zero, return false if |
| 262 | * that is the case. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | */ |
Nick Piggin | 7c8ee9a | 2006-03-22 00:08:03 -0800 | [diff] [blame] | 264 | static inline int get_page_unless_zero(struct page *page) |
| 265 | { |
Nick Piggin | 8dc04ef | 2006-03-22 00:08:03 -0800 | [diff] [blame] | 266 | return atomic_inc_not_zero(&page->_count); |
Nick Piggin | 7c8ee9a | 2006-03-22 00:08:03 -0800 | [diff] [blame] | 267 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 268 | |
Christoph Lameter | 48667e7 | 2008-02-04 22:28:31 -0800 | [diff] [blame] | 269 | /* Support for virtually mapped pages */ |
Christoph Lameter | b3bdda0 | 2008-02-04 22:28:32 -0800 | [diff] [blame] | 270 | struct page *vmalloc_to_page(const void *addr); |
| 271 | unsigned long vmalloc_to_pfn(const void *addr); |
Christoph Lameter | 48667e7 | 2008-02-04 22:28:31 -0800 | [diff] [blame] | 272 | |
Paul Mundt | 0738c4b | 2008-03-12 16:51:31 +0900 | [diff] [blame] | 273 | /* |
| 274 | * Determine if an address is within the vmalloc range |
| 275 | * |
| 276 | * On nommu, vmalloc/vfree wrap through kmalloc/kfree directly, so there |
| 277 | * is no special casing required. |
| 278 | */ |
Christoph Lameter | 9e2779f | 2008-02-04 22:28:34 -0800 | [diff] [blame] | 279 | static inline int is_vmalloc_addr(const void *x) |
| 280 | { |
Paul Mundt | 0738c4b | 2008-03-12 16:51:31 +0900 | [diff] [blame] | 281 | #ifdef CONFIG_MMU |
Christoph Lameter | 9e2779f | 2008-02-04 22:28:34 -0800 | [diff] [blame] | 282 | unsigned long addr = (unsigned long)x; |
| 283 | |
| 284 | return addr >= VMALLOC_START && addr < VMALLOC_END; |
Paul Mundt | 0738c4b | 2008-03-12 16:51:31 +0900 | [diff] [blame] | 285 | #else |
| 286 | return 0; |
David Howells | 8ca3ed8 | 2008-02-23 15:23:37 -0800 | [diff] [blame] | 287 | #endif |
Paul Mundt | 0738c4b | 2008-03-12 16:51:31 +0900 | [diff] [blame] | 288 | } |
Christoph Lameter | 9e2779f | 2008-02-04 22:28:34 -0800 | [diff] [blame] | 289 | |
Christoph Lameter | d85f338 | 2007-05-06 14:49:39 -0700 | [diff] [blame] | 290 | static inline struct page *compound_head(struct page *page) |
| 291 | { |
Christoph Lameter | 6d77795 | 2007-05-06 14:49:40 -0700 | [diff] [blame] | 292 | if (unlikely(PageTail(page))) |
Christoph Lameter | d85f338 | 2007-05-06 14:49:39 -0700 | [diff] [blame] | 293 | return page->first_page; |
| 294 | return page; |
| 295 | } |
| 296 | |
Hugh Dickins | 4c21e2f | 2005-10-29 18:16:40 -0700 | [diff] [blame] | 297 | static inline int page_count(struct page *page) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | { |
Christoph Lameter | d85f338 | 2007-05-06 14:49:39 -0700 | [diff] [blame] | 299 | return atomic_read(&compound_head(page)->_count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | } |
| 301 | |
| 302 | static inline void get_page(struct page *page) |
| 303 | { |
Christoph Lameter | d85f338 | 2007-05-06 14:49:39 -0700 | [diff] [blame] | 304 | page = compound_head(page); |
Nick Piggin | 725d704 | 2006-09-25 23:30:55 -0700 | [diff] [blame] | 305 | VM_BUG_ON(atomic_read(&page->_count) == 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | atomic_inc(&page->_count); |
| 307 | } |
| 308 | |
Christoph Lameter | b49af68 | 2007-05-06 14:49:41 -0700 | [diff] [blame] | 309 | static inline struct page *virt_to_head_page(const void *x) |
| 310 | { |
| 311 | struct page *page = virt_to_page(x); |
| 312 | return compound_head(page); |
| 313 | } |
| 314 | |
Nick Piggin | 7835e98 | 2006-03-22 00:08:40 -0800 | [diff] [blame] | 315 | /* |
| 316 | * Setup the page count before being freed into the page allocator for |
| 317 | * the first time (boot or memory hotplug) |
| 318 | */ |
| 319 | static inline void init_page_count(struct page *page) |
| 320 | { |
| 321 | atomic_set(&page->_count, 1); |
| 322 | } |
| 323 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 324 | void put_page(struct page *page); |
Alexander Zarochentsev | 1d7ea73 | 2006-08-13 23:24:27 -0700 | [diff] [blame] | 325 | void put_pages_list(struct list_head *pages); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | |
Nick Piggin | 8dfcc9b | 2006-03-22 00:08:05 -0800 | [diff] [blame] | 327 | void split_page(struct page *page, unsigned int order); |
Nick Piggin | 8dfcc9b | 2006-03-22 00:08:05 -0800 | [diff] [blame] | 328 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | /* |
Andy Whitcroft | 33f2ef8 | 2006-12-06 20:33:32 -0800 | [diff] [blame] | 330 | * Compound pages have a destructor function. Provide a |
| 331 | * prototype for that function and accessor functions. |
| 332 | * These are _only_ valid on the head of a PG_compound page. |
| 333 | */ |
| 334 | typedef void compound_page_dtor(struct page *); |
| 335 | |
| 336 | static inline void set_compound_page_dtor(struct page *page, |
| 337 | compound_page_dtor *dtor) |
| 338 | { |
| 339 | page[1].lru.next = (void *)dtor; |
| 340 | } |
| 341 | |
| 342 | static inline compound_page_dtor *get_compound_page_dtor(struct page *page) |
| 343 | { |
| 344 | return (compound_page_dtor *)page[1].lru.next; |
| 345 | } |
| 346 | |
Christoph Lameter | d85f338 | 2007-05-06 14:49:39 -0700 | [diff] [blame] | 347 | static inline int compound_order(struct page *page) |
| 348 | { |
Christoph Lameter | 6d77795 | 2007-05-06 14:49:40 -0700 | [diff] [blame] | 349 | if (!PageHead(page)) |
Christoph Lameter | d85f338 | 2007-05-06 14:49:39 -0700 | [diff] [blame] | 350 | return 0; |
| 351 | return (unsigned long)page[1].lru.prev; |
| 352 | } |
| 353 | |
| 354 | static inline void set_compound_order(struct page *page, unsigned long order) |
| 355 | { |
| 356 | page[1].lru.prev = (void *)order; |
| 357 | } |
| 358 | |
Andy Whitcroft | 33f2ef8 | 2006-12-06 20:33:32 -0800 | [diff] [blame] | 359 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | * Multiple processes may "see" the same page. E.g. for untouched |
| 361 | * mappings of /dev/null, all processes see the same page full of |
| 362 | * zeroes, and text pages of executables and shared libraries have |
| 363 | * only one copy in memory, at most, normally. |
| 364 | * |
| 365 | * 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] | 366 | * page_count() == 0 means the page is free. page->lru is then used for |
| 367 | * freelist management in the buddy allocator. |
Nick Piggin | da6052f | 2006-09-25 23:31:35 -0700 | [diff] [blame] | 368 | * page_count() > 0 means the page has been allocated. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | * |
Nick Piggin | da6052f | 2006-09-25 23:31:35 -0700 | [diff] [blame] | 370 | * Pages are allocated by the slab allocator in order to provide memory |
| 371 | * to kmalloc and kmem_cache_alloc. In this case, the management of the |
| 372 | * page, and the fields in 'struct page' are the responsibility of mm/slab.c |
| 373 | * unless a particular usage is carefully commented. (the responsibility of |
| 374 | * freeing the kmalloc memory is the caller's, of course). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | * |
Nick Piggin | da6052f | 2006-09-25 23:31:35 -0700 | [diff] [blame] | 376 | * A page may be used by anyone else who does a __get_free_page(). |
| 377 | * In this case, page_count still tracks the references, and should only |
| 378 | * be used through the normal accessor functions. The top bits of page->flags |
| 379 | * and page->virtual store page management information, but all other fields |
| 380 | * are unused and could be used privately, carefully. The management of this |
| 381 | * page is the responsibility of the one who allocated it, and those who have |
| 382 | * subsequently been given references to it. |
| 383 | * |
| 384 | * The other pages (we may call them "pagecache pages") are completely |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | * managed by the Linux memory manager: I/O, buffers, swapping etc. |
| 386 | * The following discussion applies only to them. |
| 387 | * |
Nick Piggin | da6052f | 2006-09-25 23:31:35 -0700 | [diff] [blame] | 388 | * A pagecache page contains an opaque `private' member, which belongs to the |
| 389 | * page's address_space. Usually, this is the address of a circular list of |
| 390 | * the page's disk buffers. PG_private must be set to tell the VM to call |
| 391 | * into the filesystem to release these pages. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | * |
Nick Piggin | da6052f | 2006-09-25 23:31:35 -0700 | [diff] [blame] | 393 | * A page may belong to an inode's memory mapping. In this case, page->mapping |
| 394 | * is the pointer to the inode, and page->index is the file offset of the page, |
| 395 | * in units of PAGE_CACHE_SIZE. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | * |
Nick Piggin | da6052f | 2006-09-25 23:31:35 -0700 | [diff] [blame] | 397 | * If pagecache pages are not associated with an inode, they are said to be |
| 398 | * anonymous pages. These may become associated with the swapcache, and in that |
| 399 | * 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] | 400 | * |
Nick Piggin | da6052f | 2006-09-25 23:31:35 -0700 | [diff] [blame] | 401 | * In either case (swapcache or inode backed), the pagecache itself holds one |
| 402 | * reference to the page. Setting PG_private should also increment the |
| 403 | * refcount. The each user mapping also has a reference to the page. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | * |
Nick Piggin | da6052f | 2006-09-25 23:31:35 -0700 | [diff] [blame] | 405 | * The pagecache pages are stored in a per-mapping radix tree, which is |
| 406 | * rooted at mapping->page_tree, and indexed by offset. |
| 407 | * Where 2.4 and early 2.6 kernels kept dirty/clean pages in per-address_space |
| 408 | * 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] | 409 | * |
Nick Piggin | da6052f | 2006-09-25 23:31:35 -0700 | [diff] [blame] | 410 | * All pagecache pages may be subject to I/O: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | * - inode pages may need to be read from disk, |
| 412 | * - inode pages which have been modified and are MAP_SHARED may need |
Nick Piggin | da6052f | 2006-09-25 23:31:35 -0700 | [diff] [blame] | 413 | * to be written back to the inode on disk, |
| 414 | * - anonymous pages (including MAP_PRIVATE file mappings) which have been |
| 415 | * modified may need to be swapped out to swap space and (later) to be read |
| 416 | * back into memory. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | */ |
| 418 | |
| 419 | /* |
| 420 | * The zone field is never updated after free_area_init_core() |
| 421 | * 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] | 422 | */ |
Dave Hansen | 348f8b6 | 2005-06-23 00:07:40 -0700 | [diff] [blame] | 423 | |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 424 | |
| 425 | /* |
| 426 | * page->flags layout: |
| 427 | * |
| 428 | * There are three possibilities for how page->flags get |
| 429 | * laid out. The first is for the normal case, without |
| 430 | * sparsemem. The second is for sparsemem when there is |
| 431 | * plenty of space for node and section. The last is when |
| 432 | * we have run out of space and have to fall back to an |
| 433 | * alternate (slower) way of determining the node. |
| 434 | * |
Christoph Lameter | 308c05e | 2008-04-28 02:12:43 -0700 | [diff] [blame] | 435 | * No sparsemem or sparsemem vmemmap: | NODE | ZONE | ... | FLAGS | |
| 436 | * classic sparse with space for node:| SECTION | NODE | ZONE | ... | FLAGS | |
| 437 | * classic sparse no space for node: | SECTION | ZONE | ... | FLAGS | |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 438 | */ |
Christoph Lameter | 308c05e | 2008-04-28 02:12:43 -0700 | [diff] [blame] | 439 | #if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP) |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 440 | #define SECTIONS_WIDTH SECTIONS_SHIFT |
| 441 | #else |
| 442 | #define SECTIONS_WIDTH 0 |
| 443 | #endif |
| 444 | |
| 445 | #define ZONES_WIDTH ZONES_SHIFT |
| 446 | |
Christoph Lameter | 9223b41 | 2008-04-28 02:12:48 -0700 | [diff] [blame] | 447 | #if SECTIONS_WIDTH+ZONES_WIDTH+NODES_SHIFT <= BITS_PER_LONG - NR_PAGEFLAGS |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 448 | #define NODES_WIDTH NODES_SHIFT |
| 449 | #else |
Christoph Lameter | 308c05e | 2008-04-28 02:12:43 -0700 | [diff] [blame] | 450 | #ifdef CONFIG_SPARSEMEM_VMEMMAP |
| 451 | #error "Vmemmap: No space for nodes field in page flags" |
| 452 | #endif |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 453 | #define NODES_WIDTH 0 |
| 454 | #endif |
| 455 | |
| 456 | /* Page flags: | [SECTION] | [NODE] | ZONE | ... | FLAGS | */ |
Andi Kleen | 07808b7 | 2005-11-05 17:25:53 +0100 | [diff] [blame] | 457 | #define SECTIONS_PGOFF ((sizeof(unsigned long)*8) - SECTIONS_WIDTH) |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 458 | #define NODES_PGOFF (SECTIONS_PGOFF - NODES_WIDTH) |
| 459 | #define ZONES_PGOFF (NODES_PGOFF - ZONES_WIDTH) |
| 460 | |
| 461 | /* |
| 462 | * We are going to use the flags for the page to node mapping if its in |
| 463 | * there. This includes the case where there is no node, so it is implicit. |
| 464 | */ |
Christoph Lameter | 89689ae | 2006-12-06 20:31:45 -0800 | [diff] [blame] | 465 | #if !(NODES_WIDTH > 0 || NODES_SHIFT == 0) |
| 466 | #define NODE_NOT_IN_PAGE_FLAGS |
| 467 | #endif |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 468 | |
| 469 | #ifndef PFN_SECTION_SHIFT |
| 470 | #define PFN_SECTION_SHIFT 0 |
| 471 | #endif |
Dave Hansen | 348f8b6 | 2005-06-23 00:07:40 -0700 | [diff] [blame] | 472 | |
| 473 | /* |
| 474 | * Define the bit shifts to access each section. For non-existant |
| 475 | * sections we define the shift as 0; that plus a 0 mask ensures |
| 476 | * the compiler will optimise away reference to them. |
| 477 | */ |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 478 | #define SECTIONS_PGSHIFT (SECTIONS_PGOFF * (SECTIONS_WIDTH != 0)) |
| 479 | #define NODES_PGSHIFT (NODES_PGOFF * (NODES_WIDTH != 0)) |
| 480 | #define ZONES_PGSHIFT (ZONES_PGOFF * (ZONES_WIDTH != 0)) |
Dave Hansen | 348f8b6 | 2005-06-23 00:07:40 -0700 | [diff] [blame] | 481 | |
Christoph Lameter | 89689ae | 2006-12-06 20:31:45 -0800 | [diff] [blame] | 482 | /* NODE:ZONE or SECTION:ZONE is used to ID a zone for the buddy allcator */ |
| 483 | #ifdef NODE_NOT_IN_PAGEFLAGS |
| 484 | #define ZONEID_SHIFT (SECTIONS_SHIFT + ZONES_SHIFT) |
Andy Whitcroft | bd8029b | 2007-02-10 01:43:14 -0800 | [diff] [blame] | 485 | #define ZONEID_PGOFF ((SECTIONS_PGOFF < ZONES_PGOFF)? \ |
| 486 | SECTIONS_PGOFF : ZONES_PGOFF) |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 487 | #else |
Christoph Lameter | 89689ae | 2006-12-06 20:31:45 -0800 | [diff] [blame] | 488 | #define ZONEID_SHIFT (NODES_SHIFT + ZONES_SHIFT) |
Andy Whitcroft | bd8029b | 2007-02-10 01:43:14 -0800 | [diff] [blame] | 489 | #define ZONEID_PGOFF ((NODES_PGOFF < ZONES_PGOFF)? \ |
| 490 | NODES_PGOFF : ZONES_PGOFF) |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 491 | #endif |
Christoph Lameter | 89689ae | 2006-12-06 20:31:45 -0800 | [diff] [blame] | 492 | |
Andy Whitcroft | bd8029b | 2007-02-10 01:43:14 -0800 | [diff] [blame] | 493 | #define ZONEID_PGSHIFT (ZONEID_PGOFF * (ZONEID_SHIFT != 0)) |
Dave Hansen | 348f8b6 | 2005-06-23 00:07:40 -0700 | [diff] [blame] | 494 | |
Christoph Lameter | 9223b41 | 2008-04-28 02:12:48 -0700 | [diff] [blame] | 495 | #if SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS |
| 496 | #error SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS |
Dave Hansen | 348f8b6 | 2005-06-23 00:07:40 -0700 | [diff] [blame] | 497 | #endif |
| 498 | |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 499 | #define ZONES_MASK ((1UL << ZONES_WIDTH) - 1) |
| 500 | #define NODES_MASK ((1UL << NODES_WIDTH) - 1) |
| 501 | #define SECTIONS_MASK ((1UL << SECTIONS_WIDTH) - 1) |
Christoph Lameter | 89689ae | 2006-12-06 20:31:45 -0800 | [diff] [blame] | 502 | #define ZONEID_MASK ((1UL << ZONEID_SHIFT) - 1) |
Dave Hansen | 348f8b6 | 2005-06-23 00:07:40 -0700 | [diff] [blame] | 503 | |
Christoph Lameter | 2f1b624 | 2006-09-25 23:31:13 -0700 | [diff] [blame] | 504 | static inline enum zone_type page_zonenum(struct page *page) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | { |
Dave Hansen | 348f8b6 | 2005-06-23 00:07:40 -0700 | [diff] [blame] | 506 | return (page->flags >> ZONES_PGSHIFT) & ZONES_MASK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | |
Christoph Lameter | 89689ae | 2006-12-06 20:31:45 -0800 | [diff] [blame] | 509 | /* |
| 510 | * The identification function is only used by the buddy allocator for |
| 511 | * determining if two pages could be buddies. We are not really |
| 512 | * identifying a zone since we could be using a the section number |
| 513 | * id if we have not node id available in page flags. |
| 514 | * We guarantee only that it will return the same value for two |
| 515 | * combinable pages in a zone. |
| 516 | */ |
Andy Whitcroft | cb2b95e | 2006-06-23 02:03:01 -0700 | [diff] [blame] | 517 | static inline int page_zone_id(struct page *page) |
| 518 | { |
Christoph Lameter | 89689ae | 2006-12-06 20:31:45 -0800 | [diff] [blame] | 519 | return (page->flags >> ZONEID_PGSHIFT) & ZONEID_MASK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 520 | } |
| 521 | |
Andy Whitcroft | 25ba77c | 2006-12-06 20:33:03 -0800 | [diff] [blame] | 522 | static inline int zone_to_nid(struct zone *zone) |
Christoph Lameter | 89fa302 | 2006-09-25 23:31:55 -0700 | [diff] [blame] | 523 | { |
Christoph Lameter | d5f541e | 2006-09-27 01:50:08 -0700 | [diff] [blame] | 524 | #ifdef CONFIG_NUMA |
| 525 | return zone->node; |
| 526 | #else |
| 527 | return 0; |
| 528 | #endif |
Christoph Lameter | 89fa302 | 2006-09-25 23:31:55 -0700 | [diff] [blame] | 529 | } |
| 530 | |
Christoph Lameter | 89689ae | 2006-12-06 20:31:45 -0800 | [diff] [blame] | 531 | #ifdef NODE_NOT_IN_PAGE_FLAGS |
Andy Whitcroft | 25ba77c | 2006-12-06 20:33:03 -0800 | [diff] [blame] | 532 | extern int page_to_nid(struct page *page); |
Christoph Lameter | 89689ae | 2006-12-06 20:31:45 -0800 | [diff] [blame] | 533 | #else |
Andy Whitcroft | 25ba77c | 2006-12-06 20:33:03 -0800 | [diff] [blame] | 534 | static inline int page_to_nid(struct page *page) |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 535 | { |
Christoph Lameter | 89689ae | 2006-12-06 20:31:45 -0800 | [diff] [blame] | 536 | return (page->flags >> NODES_PGSHIFT) & NODES_MASK; |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 537 | } |
Christoph Lameter | 89689ae | 2006-12-06 20:31:45 -0800 | [diff] [blame] | 538 | #endif |
| 539 | |
| 540 | static inline struct zone *page_zone(struct page *page) |
| 541 | { |
| 542 | return &NODE_DATA(page_to_nid(page))->node_zones[page_zonenum(page)]; |
| 543 | } |
| 544 | |
Christoph Lameter | 308c05e | 2008-04-28 02:12:43 -0700 | [diff] [blame] | 545 | #if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP) |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 546 | static inline unsigned long page_to_section(struct page *page) |
| 547 | { |
| 548 | return (page->flags >> SECTIONS_PGSHIFT) & SECTIONS_MASK; |
| 549 | } |
Christoph Lameter | 308c05e | 2008-04-28 02:12:43 -0700 | [diff] [blame] | 550 | #endif |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 551 | |
Christoph Lameter | 2f1b624 | 2006-09-25 23:31:13 -0700 | [diff] [blame] | 552 | 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] | 553 | { |
Dave Hansen | 348f8b6 | 2005-06-23 00:07:40 -0700 | [diff] [blame] | 554 | page->flags &= ~(ZONES_MASK << ZONES_PGSHIFT); |
| 555 | page->flags |= (zone & ZONES_MASK) << ZONES_PGSHIFT; |
| 556 | } |
Christoph Lameter | 2f1b624 | 2006-09-25 23:31:13 -0700 | [diff] [blame] | 557 | |
Dave Hansen | 348f8b6 | 2005-06-23 00:07:40 -0700 | [diff] [blame] | 558 | static inline void set_page_node(struct page *page, unsigned long node) |
| 559 | { |
| 560 | page->flags &= ~(NODES_MASK << NODES_PGSHIFT); |
| 561 | page->flags |= (node & NODES_MASK) << NODES_PGSHIFT; |
| 562 | } |
Christoph Lameter | 89689ae | 2006-12-06 20:31:45 -0800 | [diff] [blame] | 563 | |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 564 | static inline void set_page_section(struct page *page, unsigned long section) |
| 565 | { |
| 566 | page->flags &= ~(SECTIONS_MASK << SECTIONS_PGSHIFT); |
| 567 | page->flags |= (section & SECTIONS_MASK) << SECTIONS_PGSHIFT; |
| 568 | } |
Dave Hansen | 348f8b6 | 2005-06-23 00:07:40 -0700 | [diff] [blame] | 569 | |
Christoph Lameter | 2f1b624 | 2006-09-25 23:31:13 -0700 | [diff] [blame] | 570 | 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] | 571 | unsigned long node, unsigned long pfn) |
Dave Hansen | 348f8b6 | 2005-06-23 00:07:40 -0700 | [diff] [blame] | 572 | { |
| 573 | set_page_zone(page, zone); |
| 574 | set_page_node(page, node); |
Andy Whitcroft | d41dee3 | 2005-06-23 00:07:54 -0700 | [diff] [blame] | 575 | set_page_section(page, pfn_to_section_nr(pfn)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 576 | } |
| 577 | |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 578 | /* |
Eric Paris | 7cd9414 | 2007-11-26 18:47:40 -0500 | [diff] [blame] | 579 | * If a hint addr is less than mmap_min_addr change hint to be as |
| 580 | * low as possible but still greater than mmap_min_addr |
| 581 | */ |
| 582 | static inline unsigned long round_hint_to_min(unsigned long hint) |
| 583 | { |
Eric Paris | 7cd9414 | 2007-11-26 18:47:40 -0500 | [diff] [blame] | 584 | hint &= PAGE_MASK; |
| 585 | if (((void *)hint != NULL) && |
| 586 | (hint < mmap_min_addr)) |
| 587 | return PAGE_ALIGN(mmap_min_addr); |
Eric Paris | 7cd9414 | 2007-11-26 18:47:40 -0500 | [diff] [blame] | 588 | return hint; |
| 589 | } |
| 590 | |
| 591 | /* |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 592 | * Some inline functions in vmstat.h depend on page_zone() |
| 593 | */ |
| 594 | #include <linux/vmstat.h> |
| 595 | |
Ingo Molnar | 652050a | 2006-01-14 13:21:30 -0800 | [diff] [blame] | 596 | static __always_inline void *lowmem_page_address(struct page *page) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 597 | { |
| 598 | return __va(page_to_pfn(page) << PAGE_SHIFT); |
| 599 | } |
| 600 | |
| 601 | #if defined(CONFIG_HIGHMEM) && !defined(WANT_PAGE_VIRTUAL) |
| 602 | #define HASHED_PAGE_VIRTUAL |
| 603 | #endif |
| 604 | |
| 605 | #if defined(WANT_PAGE_VIRTUAL) |
| 606 | #define page_address(page) ((page)->virtual) |
| 607 | #define set_page_address(page, address) \ |
| 608 | do { \ |
| 609 | (page)->virtual = (address); \ |
| 610 | } while(0) |
| 611 | #define page_address_init() do { } while(0) |
| 612 | #endif |
| 613 | |
| 614 | #if defined(HASHED_PAGE_VIRTUAL) |
| 615 | void *page_address(struct page *page); |
| 616 | void set_page_address(struct page *page, void *virtual); |
| 617 | void page_address_init(void); |
| 618 | #endif |
| 619 | |
| 620 | #if !defined(HASHED_PAGE_VIRTUAL) && !defined(WANT_PAGE_VIRTUAL) |
| 621 | #define page_address(page) lowmem_page_address(page) |
| 622 | #define set_page_address(page, address) do { } while(0) |
| 623 | #define page_address_init() do { } while(0) |
| 624 | #endif |
| 625 | |
| 626 | /* |
| 627 | * On an anonymous page mapped into a user virtual memory area, |
| 628 | * page->mapping points to its anon_vma, not to a struct address_space; |
| 629 | * with the PAGE_MAPPING_ANON bit set to distinguish it. |
| 630 | * |
| 631 | * Please note that, confusingly, "page_mapping" refers to the inode |
| 632 | * address_space which maps the page from disk; whereas "page_mapped" |
| 633 | * refers to user virtual address space into which the page is mapped. |
| 634 | */ |
| 635 | #define PAGE_MAPPING_ANON 1 |
| 636 | |
| 637 | extern struct address_space swapper_space; |
| 638 | static inline struct address_space *page_mapping(struct page *page) |
| 639 | { |
| 640 | struct address_space *mapping = page->mapping; |
| 641 | |
Christoph Lameter | b5fab14 | 2007-07-17 04:03:33 -0700 | [diff] [blame] | 642 | VM_BUG_ON(PageSlab(page)); |
Andrew Morton | 726b801 | 2008-04-28 02:12:44 -0700 | [diff] [blame] | 643 | #ifdef CONFIG_SWAP |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 644 | if (unlikely(PageSwapCache(page))) |
| 645 | mapping = &swapper_space; |
Andrew Morton | 726b801 | 2008-04-28 02:12:44 -0700 | [diff] [blame] | 646 | else |
| 647 | #endif |
| 648 | if (unlikely((unsigned long)mapping & PAGE_MAPPING_ANON)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 649 | mapping = NULL; |
| 650 | return mapping; |
| 651 | } |
| 652 | |
| 653 | static inline int PageAnon(struct page *page) |
| 654 | { |
| 655 | return ((unsigned long)page->mapping & PAGE_MAPPING_ANON) != 0; |
| 656 | } |
| 657 | |
| 658 | /* |
| 659 | * Return the pagecache index of the passed page. Regular pagecache pages |
| 660 | * use ->index whereas swapcache pages use ->private |
| 661 | */ |
| 662 | static inline pgoff_t page_index(struct page *page) |
| 663 | { |
| 664 | if (unlikely(PageSwapCache(page))) |
Hugh Dickins | 4c21e2f | 2005-10-29 18:16:40 -0700 | [diff] [blame] | 665 | return page_private(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 666 | return page->index; |
| 667 | } |
| 668 | |
| 669 | /* |
| 670 | * The atomic page->_mapcount, like _count, starts from -1: |
| 671 | * so that transitions both from it and to it can be tracked, |
| 672 | * using atomic_inc_and_test and atomic_add_negative(-1). |
| 673 | */ |
| 674 | static inline void reset_page_mapcount(struct page *page) |
| 675 | { |
| 676 | atomic_set(&(page)->_mapcount, -1); |
| 677 | } |
| 678 | |
| 679 | static inline int page_mapcount(struct page *page) |
| 680 | { |
| 681 | return atomic_read(&(page)->_mapcount) + 1; |
| 682 | } |
| 683 | |
| 684 | /* |
| 685 | * Return true if this page is mapped into pagetables. |
| 686 | */ |
| 687 | static inline int page_mapped(struct page *page) |
| 688 | { |
| 689 | return atomic_read(&(page)->_mapcount) >= 0; |
| 690 | } |
| 691 | |
| 692 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 693 | * Different kinds of faults, as returned by handle_mm_fault(). |
| 694 | * Used to decide whether a process gets delivered SIGBUS or |
| 695 | * just gets major/minor fault counters bumped up. |
| 696 | */ |
Nick Piggin | d0217ac | 2007-07-19 01:47:03 -0700 | [diff] [blame] | 697 | |
Nick Piggin | 83c5407 | 2007-07-19 01:47:05 -0700 | [diff] [blame] | 698 | #define VM_FAULT_MINOR 0 /* For backwards compat. Remove me quickly. */ |
Nick Piggin | d0217ac | 2007-07-19 01:47:03 -0700 | [diff] [blame] | 699 | |
Nick Piggin | 83c5407 | 2007-07-19 01:47:05 -0700 | [diff] [blame] | 700 | #define VM_FAULT_OOM 0x0001 |
| 701 | #define VM_FAULT_SIGBUS 0x0002 |
| 702 | #define VM_FAULT_MAJOR 0x0004 |
| 703 | #define VM_FAULT_WRITE 0x0008 /* Special case for get_user_pages */ |
Nick Piggin | f33ea7f | 2005-08-03 20:24:01 +1000 | [diff] [blame] | 704 | |
Nick Piggin | 83c5407 | 2007-07-19 01:47:05 -0700 | [diff] [blame] | 705 | #define VM_FAULT_NOPAGE 0x0100 /* ->fault installed the pte, not return page */ |
| 706 | #define VM_FAULT_LOCKED 0x0200 /* ->fault locked the returned page */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 707 | |
Nick Piggin | 83c5407 | 2007-07-19 01:47:05 -0700 | [diff] [blame] | 708 | #define VM_FAULT_ERROR (VM_FAULT_OOM | VM_FAULT_SIGBUS) |
Nick Piggin | d0217ac | 2007-07-19 01:47:03 -0700 | [diff] [blame] | 709 | |
Nick Piggin | 1c0fe6e | 2009-01-06 14:38:59 -0800 | [diff] [blame] | 710 | /* |
| 711 | * Can be called by the pagefault handler when it gets a VM_FAULT_OOM. |
| 712 | */ |
| 713 | extern void pagefault_out_of_memory(void); |
| 714 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 715 | #define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK) |
| 716 | |
| 717 | extern void show_free_areas(void); |
| 718 | |
| 719 | #ifdef CONFIG_SHMEM |
Lee Schermerhorn | 89e004ea | 2008-10-18 20:26:43 -0700 | [diff] [blame] | 720 | 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] | 721 | #else |
Russell King | 03b00eb | 2006-01-06 00:10:52 -0800 | [diff] [blame] | 722 | static inline int shmem_lock(struct file *file, int lock, |
Lee Schermerhorn | 89e004ea | 2008-10-18 20:26:43 -0700 | [diff] [blame] | 723 | struct user_struct *user) |
Russell King | 03b00eb | 2006-01-06 00:10:52 -0800 | [diff] [blame] | 724 | { |
| 725 | return 0; |
| 726 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 727 | #endif |
| 728 | struct file *shmem_file_setup(char *name, loff_t size, unsigned long flags); |
| 729 | |
| 730 | int shmem_zero_setup(struct vm_area_struct *); |
| 731 | |
David Howells | b0e1519 | 2006-01-06 00:11:42 -0800 | [diff] [blame] | 732 | #ifndef CONFIG_MMU |
| 733 | extern unsigned long shmem_get_unmapped_area(struct file *file, |
| 734 | unsigned long addr, |
| 735 | unsigned long len, |
| 736 | unsigned long pgoff, |
| 737 | unsigned long flags); |
| 738 | #endif |
| 739 | |
Alexey Dobriyan | e8edc6e | 2007-05-21 01:22:52 +0400 | [diff] [blame] | 740 | extern int can_do_mlock(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 741 | extern int user_shm_lock(size_t, struct user_struct *); |
| 742 | extern void user_shm_unlock(size_t, struct user_struct *); |
| 743 | |
| 744 | /* |
| 745 | * Parameter block passed down to zap_pte_range in exceptional cases. |
| 746 | */ |
| 747 | struct zap_details { |
| 748 | struct vm_area_struct *nonlinear_vma; /* Check page->index if set */ |
| 749 | struct address_space *check_mapping; /* Check page->mapping if set */ |
| 750 | pgoff_t first_index; /* Lowest page->index to unmap */ |
| 751 | pgoff_t last_index; /* Highest page->index to unmap */ |
| 752 | spinlock_t *i_mmap_lock; /* For unmap_mapping_range: */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 753 | unsigned long truncate_count; /* Compare vm_truncate_count */ |
| 754 | }; |
| 755 | |
Nick Piggin | 7e67513 | 2008-04-28 02:13:00 -0700 | [diff] [blame] | 756 | struct page *vm_normal_page(struct vm_area_struct *vma, unsigned long addr, |
| 757 | pte_t pte); |
| 758 | |
Jack Steiner | c627f9c | 2008-07-29 22:33:53 -0700 | [diff] [blame] | 759 | int zap_vma_ptes(struct vm_area_struct *vma, unsigned long address, |
| 760 | unsigned long size); |
Hugh Dickins | ee39b37 | 2005-04-19 13:29:15 -0700 | [diff] [blame] | 761 | 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] | 762 | unsigned long size, struct zap_details *); |
Hugh Dickins | 508034a | 2005-10-29 18:16:30 -0700 | [diff] [blame] | 763 | unsigned long unmap_vmas(struct mmu_gather **tlb, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | struct vm_area_struct *start_vma, unsigned long start_addr, |
| 765 | unsigned long end_addr, unsigned long *nr_accounted, |
| 766 | struct zap_details *); |
Matt Mackall | e647309 | 2008-02-04 22:29:01 -0800 | [diff] [blame] | 767 | |
| 768 | /** |
| 769 | * mm_walk - callbacks for walk_page_range |
| 770 | * @pgd_entry: if set, called for each non-empty PGD (top-level) entry |
| 771 | * @pud_entry: if set, called for each non-empty PUD (2nd-level) entry |
| 772 | * @pmd_entry: if set, called for each non-empty PMD (3rd-level) entry |
| 773 | * @pte_entry: if set, called for each non-empty PTE (4th-level) entry |
| 774 | * @pte_hole: if set, called for each hole at all levels |
| 775 | * |
| 776 | * (see walk_page_range for more details) |
| 777 | */ |
| 778 | struct mm_walk { |
Dave Hansen | 2165009 | 2008-06-12 15:21:47 -0700 | [diff] [blame] | 779 | int (*pgd_entry)(pgd_t *, unsigned long, unsigned long, struct mm_walk *); |
| 780 | int (*pud_entry)(pud_t *, unsigned long, unsigned long, struct mm_walk *); |
| 781 | int (*pmd_entry)(pmd_t *, unsigned long, unsigned long, struct mm_walk *); |
| 782 | int (*pte_entry)(pte_t *, unsigned long, unsigned long, struct mm_walk *); |
| 783 | int (*pte_hole)(unsigned long, unsigned long, struct mm_walk *); |
| 784 | struct mm_struct *mm; |
| 785 | void *private; |
Matt Mackall | e647309 | 2008-02-04 22:29:01 -0800 | [diff] [blame] | 786 | }; |
| 787 | |
Dave Hansen | 2165009 | 2008-06-12 15:21:47 -0700 | [diff] [blame] | 788 | int walk_page_range(unsigned long addr, unsigned long end, |
| 789 | struct mm_walk *walk); |
Jan Beulich | 42b7772 | 2008-07-23 21:27:10 -0700 | [diff] [blame] | 790 | void free_pgd_range(struct mmu_gather *tlb, unsigned long addr, |
Hugh Dickins | 3bf5ee9 | 2005-04-19 13:29:16 -0700 | [diff] [blame] | 791 | unsigned long end, unsigned long floor, unsigned long ceiling); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 792 | int copy_page_range(struct mm_struct *dst, struct mm_struct *src, |
| 793 | struct vm_area_struct *vma); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 794 | void unmap_mapping_range(struct address_space *mapping, |
| 795 | loff_t const holebegin, loff_t const holelen, int even_cows); |
venkatesh.pallipadi@intel.com | d87fe66 | 2008-12-19 13:47:27 -0800 | [diff] [blame] | 796 | int follow_phys(struct vm_area_struct *vma, unsigned long address, |
| 797 | unsigned int flags, unsigned long *prot, resource_size_t *phys); |
Rik van Riel | 28b2ee2 | 2008-07-23 21:27:05 -0700 | [diff] [blame] | 798 | int generic_access_phys(struct vm_area_struct *vma, unsigned long addr, |
| 799 | void *buf, int len, int write); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 800 | |
| 801 | static inline void unmap_shared_mapping_range(struct address_space *mapping, |
| 802 | loff_t const holebegin, loff_t const holelen) |
| 803 | { |
| 804 | unmap_mapping_range(mapping, holebegin, holelen, 0); |
| 805 | } |
| 806 | |
| 807 | extern int vmtruncate(struct inode * inode, loff_t offset); |
Badari Pulavarty | f6b3ec2 | 2006-01-06 00:10:38 -0800 | [diff] [blame] | 808 | 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] | 809 | |
David Howells | 7ee1dd3 | 2006-01-06 00:11:44 -0800 | [diff] [blame] | 810 | #ifdef CONFIG_MMU |
Nick Piggin | 83c5407 | 2007-07-19 01:47:05 -0700 | [diff] [blame] | 811 | 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] | 812 | unsigned long address, int write_access); |
David Howells | 7ee1dd3 | 2006-01-06 00:11:44 -0800 | [diff] [blame] | 813 | #else |
| 814 | static inline int handle_mm_fault(struct mm_struct *mm, |
| 815 | struct vm_area_struct *vma, unsigned long address, |
| 816 | int write_access) |
| 817 | { |
| 818 | /* should never happen if there's no MMU */ |
| 819 | BUG(); |
| 820 | return VM_FAULT_SIGBUS; |
| 821 | } |
| 822 | #endif |
Nick Piggin | f33ea7f | 2005-08-03 20:24:01 +1000 | [diff] [blame] | 823 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 824 | extern int make_pages_present(unsigned long addr, unsigned long end); |
| 825 | 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] | 826 | |
Nick Piggin | d2bf6be | 2009-06-16 15:31:39 -0700 | [diff] [blame^] | 827 | int get_user_pages(struct task_struct *tsk, struct mm_struct *mm, |
| 828 | unsigned long start, int len, int write, int force, |
| 829 | struct page **pages, struct vm_area_struct **vmas); |
| 830 | int get_user_pages_fast(unsigned long start, int nr_pages, int write, |
| 831 | struct page **pages); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 832 | |
David Howells | cf9a2ae | 2006-08-29 19:05:54 +0100 | [diff] [blame] | 833 | extern int try_to_release_page(struct page * page, gfp_t gfp_mask); |
| 834 | extern void do_invalidatepage(struct page *page, unsigned long offset); |
| 835 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 836 | int __set_page_dirty_nobuffers(struct page *page); |
Ken Chen | 7671932 | 2007-02-10 01:43:15 -0800 | [diff] [blame] | 837 | int __set_page_dirty_no_writeback(struct page *page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 838 | int redirty_page_for_writepage(struct writeback_control *wbc, |
| 839 | struct page *page); |
Edward Shishkin | e3a7cca | 2009-03-31 15:19:39 -0700 | [diff] [blame] | 840 | void account_page_dirtied(struct page *page, struct address_space *mapping); |
Harvey Harrison | b3c9752 | 2008-02-13 15:03:15 -0800 | [diff] [blame] | 841 | int set_page_dirty(struct page *page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 842 | int set_page_dirty_lock(struct page *page); |
| 843 | int clear_page_dirty_for_io(struct page *page); |
| 844 | |
Ollie Wild | b6a2fea | 2007-07-19 01:48:16 -0700 | [diff] [blame] | 845 | extern unsigned long move_page_tables(struct vm_area_struct *vma, |
| 846 | unsigned long old_addr, struct vm_area_struct *new_vma, |
| 847 | unsigned long new_addr, unsigned long len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 848 | extern unsigned long do_mremap(unsigned long addr, |
| 849 | unsigned long old_len, unsigned long new_len, |
| 850 | unsigned long flags, unsigned long new_addr); |
Ollie Wild | b6a2fea | 2007-07-19 01:48:16 -0700 | [diff] [blame] | 851 | extern int mprotect_fixup(struct vm_area_struct *vma, |
| 852 | struct vm_area_struct **pprev, unsigned long start, |
| 853 | unsigned long end, unsigned long newflags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 854 | |
Nick Piggin | 21cc199 | 2008-07-25 19:45:22 -0700 | [diff] [blame] | 855 | /* |
Rusty Russell | 8e1f936 | 2007-07-17 04:03:17 -0700 | [diff] [blame] | 856 | * A callback you can register to apply pressure to ageable caches. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 857 | * |
Rusty Russell | 8e1f936 | 2007-07-17 04:03:17 -0700 | [diff] [blame] | 858 | * 'shrink' is passed a count 'nr_to_scan' and a 'gfpmask'. It should |
| 859 | * look through the least-recently-used 'nr_to_scan' entries and |
| 860 | * attempt to free them up. It should return the number of objects |
| 861 | * which remain in the cache. If it returns -1, it means it cannot do |
| 862 | * any scanning at this time (eg. there is a risk of deadlock). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 863 | * |
Rusty Russell | 8e1f936 | 2007-07-17 04:03:17 -0700 | [diff] [blame] | 864 | * The 'gfpmask' refers to the allocation we are currently trying to |
| 865 | * fulfil. |
| 866 | * |
| 867 | * Note that 'shrink' will be passed nr_to_scan == 0 when the VM is |
| 868 | * querying the cache size, so a fastpath for that case is appropriate. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 869 | */ |
Rusty Russell | 8e1f936 | 2007-07-17 04:03:17 -0700 | [diff] [blame] | 870 | struct shrinker { |
| 871 | int (*shrink)(int nr_to_scan, gfp_t gfp_mask); |
| 872 | int seeks; /* seeks to recreate an obj */ |
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 | /* These are for internal use */ |
| 875 | struct list_head list; |
| 876 | long nr; /* objs pending delete */ |
| 877 | }; |
| 878 | #define DEFAULT_SEEKS 2 /* A good number if you don't know better. */ |
| 879 | extern void register_shrinker(struct shrinker *); |
| 880 | extern void unregister_shrinker(struct shrinker *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 881 | |
Alexey Dobriyan | 4e950f6 | 2007-07-30 02:36:13 +0400 | [diff] [blame] | 882 | int vma_wants_writenotify(struct vm_area_struct *vma); |
Peter Zijlstra | d08b385 | 2006-09-25 23:30:57 -0700 | [diff] [blame] | 883 | |
Harvey Harrison | b3c9752 | 2008-02-13 15:03:15 -0800 | [diff] [blame] | 884 | 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] | 885 | |
Nick Piggin | 5f22df0 | 2007-05-06 14:49:02 -0700 | [diff] [blame] | 886 | #ifdef __PAGETABLE_PUD_FOLDED |
| 887 | static inline int __pud_alloc(struct mm_struct *mm, pgd_t *pgd, |
| 888 | unsigned long address) |
| 889 | { |
| 890 | return 0; |
| 891 | } |
| 892 | #else |
Hugh Dickins | 1bb3630 | 2005-10-29 18:16:22 -0700 | [diff] [blame] | 893 | 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] | 894 | #endif |
| 895 | |
| 896 | #ifdef __PAGETABLE_PMD_FOLDED |
| 897 | static inline int __pmd_alloc(struct mm_struct *mm, pud_t *pud, |
| 898 | unsigned long address) |
| 899 | { |
| 900 | return 0; |
| 901 | } |
| 902 | #else |
Hugh Dickins | 1bb3630 | 2005-10-29 18:16:22 -0700 | [diff] [blame] | 903 | 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] | 904 | #endif |
| 905 | |
Hugh Dickins | 1bb3630 | 2005-10-29 18:16:22 -0700 | [diff] [blame] | 906 | int __pte_alloc(struct mm_struct *mm, pmd_t *pmd, unsigned long address); |
| 907 | int __pte_alloc_kernel(pmd_t *pmd, unsigned long address); |
| 908 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 909 | /* |
| 910 | * The following ifdef needed to get the 4level-fixup.h header to work. |
| 911 | * Remove it when 4level-fixup.h has been removed. |
| 912 | */ |
Hugh Dickins | 1bb3630 | 2005-10-29 18:16:22 -0700 | [diff] [blame] | 913 | #if defined(CONFIG_MMU) && !defined(__ARCH_HAS_4LEVEL_HACK) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 914 | static inline pud_t *pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address) |
| 915 | { |
Hugh Dickins | 1bb3630 | 2005-10-29 18:16:22 -0700 | [diff] [blame] | 916 | return (unlikely(pgd_none(*pgd)) && __pud_alloc(mm, pgd, address))? |
| 917 | NULL: pud_offset(pgd, address); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 918 | } |
| 919 | |
| 920 | static inline pmd_t *pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address) |
| 921 | { |
Hugh Dickins | 1bb3630 | 2005-10-29 18:16:22 -0700 | [diff] [blame] | 922 | return (unlikely(pud_none(*pud)) && __pmd_alloc(mm, pud, address))? |
| 923 | NULL: pmd_offset(pud, address); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 924 | } |
Hugh Dickins | 1bb3630 | 2005-10-29 18:16:22 -0700 | [diff] [blame] | 925 | #endif /* CONFIG_MMU && !__ARCH_HAS_4LEVEL_HACK */ |
| 926 | |
Jeremy Fitzhardinge | f7d0b92 | 2008-09-09 15:43:22 -0700 | [diff] [blame] | 927 | #if USE_SPLIT_PTLOCKS |
Hugh Dickins | 4c21e2f | 2005-10-29 18:16:40 -0700 | [diff] [blame] | 928 | /* |
| 929 | * We tuck a spinlock to guard each pagetable page into its struct page, |
| 930 | * at page->private, with BUILD_BUG_ON to make sure that this will not |
| 931 | * overflow into the next struct page (as it might with DEBUG_SPINLOCK). |
| 932 | * When freeing, reset page->mapping so free_pages_check won't complain. |
| 933 | */ |
Andrew Morton | 349aef0 | 2006-01-08 01:04:36 -0800 | [diff] [blame] | 934 | #define __pte_lockptr(page) &((page)->ptl) |
Hugh Dickins | 4c21e2f | 2005-10-29 18:16:40 -0700 | [diff] [blame] | 935 | #define pte_lock_init(_page) do { \ |
| 936 | spin_lock_init(__pte_lockptr(_page)); \ |
| 937 | } while (0) |
| 938 | #define pte_lock_deinit(page) ((page)->mapping = NULL) |
| 939 | #define pte_lockptr(mm, pmd) ({(void)(mm); __pte_lockptr(pmd_page(*(pmd)));}) |
Jeremy Fitzhardinge | f7d0b92 | 2008-09-09 15:43:22 -0700 | [diff] [blame] | 940 | #else /* !USE_SPLIT_PTLOCKS */ |
Hugh Dickins | 4c21e2f | 2005-10-29 18:16:40 -0700 | [diff] [blame] | 941 | /* |
| 942 | * We use mm->page_table_lock to guard all pagetable pages of the mm. |
| 943 | */ |
| 944 | #define pte_lock_init(page) do {} while (0) |
| 945 | #define pte_lock_deinit(page) do {} while (0) |
| 946 | #define pte_lockptr(mm, pmd) ({(void)(pmd); &(mm)->page_table_lock;}) |
Jeremy Fitzhardinge | f7d0b92 | 2008-09-09 15:43:22 -0700 | [diff] [blame] | 947 | #endif /* USE_SPLIT_PTLOCKS */ |
Hugh Dickins | 4c21e2f | 2005-10-29 18:16:40 -0700 | [diff] [blame] | 948 | |
Martin Schwidefsky | 2f569af | 2008-02-08 04:22:04 -0800 | [diff] [blame] | 949 | static inline void pgtable_page_ctor(struct page *page) |
| 950 | { |
| 951 | pte_lock_init(page); |
| 952 | inc_zone_page_state(page, NR_PAGETABLE); |
| 953 | } |
| 954 | |
| 955 | static inline void pgtable_page_dtor(struct page *page) |
| 956 | { |
| 957 | pte_lock_deinit(page); |
| 958 | dec_zone_page_state(page, NR_PAGETABLE); |
| 959 | } |
| 960 | |
Hugh Dickins | c74df32 | 2005-10-29 18:16:23 -0700 | [diff] [blame] | 961 | #define pte_offset_map_lock(mm, pmd, address, ptlp) \ |
| 962 | ({ \ |
Hugh Dickins | 4c21e2f | 2005-10-29 18:16:40 -0700 | [diff] [blame] | 963 | spinlock_t *__ptl = pte_lockptr(mm, pmd); \ |
Hugh Dickins | c74df32 | 2005-10-29 18:16:23 -0700 | [diff] [blame] | 964 | pte_t *__pte = pte_offset_map(pmd, address); \ |
| 965 | *(ptlp) = __ptl; \ |
| 966 | spin_lock(__ptl); \ |
| 967 | __pte; \ |
| 968 | }) |
| 969 | |
| 970 | #define pte_unmap_unlock(pte, ptl) do { \ |
| 971 | spin_unlock(ptl); \ |
| 972 | pte_unmap(pte); \ |
| 973 | } while (0) |
| 974 | |
Hugh Dickins | 1bb3630 | 2005-10-29 18:16:22 -0700 | [diff] [blame] | 975 | #define pte_alloc_map(mm, pmd, address) \ |
| 976 | ((unlikely(!pmd_present(*(pmd))) && __pte_alloc(mm, pmd, address))? \ |
| 977 | NULL: pte_offset_map(pmd, address)) |
| 978 | |
Hugh Dickins | c74df32 | 2005-10-29 18:16:23 -0700 | [diff] [blame] | 979 | #define pte_alloc_map_lock(mm, pmd, address, ptlp) \ |
| 980 | ((unlikely(!pmd_present(*(pmd))) && __pte_alloc(mm, pmd, address))? \ |
| 981 | NULL: pte_offset_map_lock(mm, pmd, address, ptlp)) |
| 982 | |
Hugh Dickins | 1bb3630 | 2005-10-29 18:16:22 -0700 | [diff] [blame] | 983 | #define pte_alloc_kernel(pmd, address) \ |
| 984 | ((unlikely(!pmd_present(*(pmd))) && __pte_alloc_kernel(pmd, address))? \ |
| 985 | NULL: pte_offset_kernel(pmd, address)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 986 | |
| 987 | extern void free_area_init(unsigned long * zones_size); |
Johannes Weiner | 9109fb7 | 2008-07-23 21:27:20 -0700 | [diff] [blame] | 988 | extern void free_area_init_node(int nid, unsigned long * zones_size, |
| 989 | unsigned long zone_start_pfn, unsigned long *zholes_size); |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 990 | #ifdef CONFIG_ARCH_POPULATES_NODE_MAP |
| 991 | /* |
| 992 | * With CONFIG_ARCH_POPULATES_NODE_MAP set, an architecture may initialise its |
| 993 | * zones, allocate the backing mem_map and account for memory holes in a more |
| 994 | * architecture independent manner. This is a substitute for creating the |
| 995 | * zone_sizes[] and zholes_size[] arrays and passing them to |
| 996 | * free_area_init_node() |
| 997 | * |
| 998 | * An architecture is expected to register range of page frames backed by |
| 999 | * physical memory with add_active_range() before calling |
| 1000 | * free_area_init_nodes() passing in the PFN each zone ends at. At a basic |
| 1001 | * usage, an architecture is expected to do something like |
| 1002 | * |
| 1003 | * unsigned long max_zone_pfns[MAX_NR_ZONES] = {max_dma, max_normal_pfn, |
| 1004 | * max_highmem_pfn}; |
| 1005 | * for_each_valid_physical_page_range() |
| 1006 | * add_active_range(node_id, start_pfn, end_pfn) |
| 1007 | * free_area_init_nodes(max_zone_pfns); |
| 1008 | * |
| 1009 | * If the architecture guarantees that there are no holes in the ranges |
| 1010 | * registered with add_active_range(), free_bootmem_active_regions() |
| 1011 | * will call free_bootmem_node() for each registered physical page range. |
| 1012 | * Similarly sparse_memory_present_with_active_regions() calls |
| 1013 | * memory_present() for each range when SPARSEMEM is enabled. |
| 1014 | * |
| 1015 | * See mm/page_alloc.c for more information on each function exposed by |
| 1016 | * CONFIG_ARCH_POPULATES_NODE_MAP |
| 1017 | */ |
| 1018 | extern void free_area_init_nodes(unsigned long *max_zone_pfn); |
| 1019 | extern void add_active_range(unsigned int nid, unsigned long start_pfn, |
| 1020 | unsigned long end_pfn); |
Yinghai Lu | cc1050b | 2008-06-13 19:08:52 -0700 | [diff] [blame] | 1021 | extern void remove_active_range(unsigned int nid, unsigned long start_pfn, |
| 1022 | unsigned long end_pfn); |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 1023 | extern void remove_all_active_ranges(void); |
| 1024 | extern unsigned long absent_pages_in_range(unsigned long start_pfn, |
| 1025 | unsigned long end_pfn); |
| 1026 | extern void get_pfn_range_for_nid(unsigned int nid, |
| 1027 | unsigned long *start_pfn, unsigned long *end_pfn); |
| 1028 | extern unsigned long find_min_pfn_with_active_regions(void); |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 1029 | extern void free_bootmem_with_active_regions(int nid, |
| 1030 | unsigned long max_low_pfn); |
Yinghai Lu | d52d53b | 2008-06-16 20:10:55 -0700 | [diff] [blame] | 1031 | typedef int (*work_fn_t)(unsigned long, unsigned long, void *); |
Yinghai Lu | b5bc6c0 | 2008-06-14 18:32:52 -0700 | [diff] [blame] | 1032 | 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] | 1033 | extern void sparse_memory_present_with_active_regions(int nid); |
Mel Gorman | c713216 | 2006-09-27 01:49:43 -0700 | [diff] [blame] | 1034 | #endif /* CONFIG_ARCH_POPULATES_NODE_MAP */ |
KAMEZAWA Hiroyuki | f2dbcfa | 2009-02-18 14:48:32 -0800 | [diff] [blame] | 1035 | |
| 1036 | #if !defined(CONFIG_ARCH_POPULATES_NODE_MAP) && \ |
| 1037 | !defined(CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID) |
| 1038 | static inline int __early_pfn_to_nid(unsigned long pfn) |
| 1039 | { |
| 1040 | return 0; |
| 1041 | } |
| 1042 | #else |
| 1043 | /* please see mm/page_alloc.c */ |
| 1044 | extern int __meminit early_pfn_to_nid(unsigned long pfn); |
| 1045 | #ifdef CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID |
| 1046 | /* there is a per-arch backend function. */ |
| 1047 | extern int __meminit __early_pfn_to_nid(unsigned long pfn); |
| 1048 | #endif /* CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID */ |
| 1049 | #endif |
| 1050 | |
Mel Gorman | 0e0b864 | 2006-09-27 01:49:56 -0700 | [diff] [blame] | 1051 | extern void set_dma_reserve(unsigned long new_dma_reserve); |
Dave Hansen | a2f3aa0 | 2007-01-10 23:15:30 -0800 | [diff] [blame] | 1052 | extern void memmap_init_zone(unsigned long, int, unsigned long, |
| 1053 | unsigned long, enum memmap_context); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 1054 | extern void setup_per_zone_pages_min(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1055 | extern void mem_init(void); |
David Howells | 8feae13 | 2009-01-08 12:04:47 +0000 | [diff] [blame] | 1056 | extern void __init mmap_init(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1057 | extern void show_mem(void); |
| 1058 | extern void si_meminfo(struct sysinfo * val); |
| 1059 | extern void si_meminfo_node(struct sysinfo *val, int nid); |
Mike Travis | 3461b0a | 2008-05-12 21:21:13 +0200 | [diff] [blame] | 1060 | extern int after_bootmem; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1061 | |
Christoph Lameter | e7c8d5c | 2005-06-21 17:14:47 -0700 | [diff] [blame] | 1062 | #ifdef CONFIG_NUMA |
| 1063 | extern void setup_per_cpu_pageset(void); |
| 1064 | #else |
| 1065 | static inline void setup_per_cpu_pageset(void) {} |
| 1066 | #endif |
| 1067 | |
David Howells | 8feae13 | 2009-01-08 12:04:47 +0000 | [diff] [blame] | 1068 | /* nommu.c */ |
David Howells | 33e5d769 | 2009-04-02 16:56:32 -0700 | [diff] [blame] | 1069 | extern atomic_long_t mmap_pages_allocated; |
David Howells | 8feae13 | 2009-01-08 12:04:47 +0000 | [diff] [blame] | 1070 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1071 | /* prio_tree.c */ |
| 1072 | void vma_prio_tree_add(struct vm_area_struct *, struct vm_area_struct *old); |
| 1073 | void vma_prio_tree_insert(struct vm_area_struct *, struct prio_tree_root *); |
| 1074 | void vma_prio_tree_remove(struct vm_area_struct *, struct prio_tree_root *); |
| 1075 | struct vm_area_struct *vma_prio_tree_next(struct vm_area_struct *vma, |
| 1076 | struct prio_tree_iter *iter); |
| 1077 | |
| 1078 | #define vma_prio_tree_foreach(vma, iter, root, begin, end) \ |
| 1079 | for (prio_tree_iter_init(iter, root, begin, end), vma = NULL; \ |
| 1080 | (vma = vma_prio_tree_next(vma, iter)); ) |
| 1081 | |
| 1082 | static inline void vma_nonlinear_insert(struct vm_area_struct *vma, |
| 1083 | struct list_head *list) |
| 1084 | { |
| 1085 | vma->shared.vm_set.parent = NULL; |
| 1086 | list_add_tail(&vma->shared.vm_set.list, list); |
| 1087 | } |
| 1088 | |
| 1089 | /* mmap.c */ |
Alan Cox | 34b4e4a | 2007-08-22 14:01:28 -0700 | [diff] [blame] | 1090 | 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] | 1091 | extern void vma_adjust(struct vm_area_struct *vma, unsigned long start, |
| 1092 | unsigned long end, pgoff_t pgoff, struct vm_area_struct *insert); |
| 1093 | extern struct vm_area_struct *vma_merge(struct mm_struct *, |
| 1094 | struct vm_area_struct *prev, unsigned long addr, unsigned long end, |
| 1095 | unsigned long vm_flags, struct anon_vma *, struct file *, pgoff_t, |
| 1096 | struct mempolicy *); |
| 1097 | extern struct anon_vma *find_mergeable_anon_vma(struct vm_area_struct *); |
| 1098 | extern int split_vma(struct mm_struct *, |
| 1099 | struct vm_area_struct *, unsigned long addr, int new_below); |
| 1100 | extern int insert_vm_struct(struct mm_struct *, struct vm_area_struct *); |
| 1101 | extern void __vma_link_rb(struct mm_struct *, struct vm_area_struct *, |
| 1102 | struct rb_node **, struct rb_node *); |
Hugh Dickins | a8fb561 | 2005-10-29 18:15:57 -0700 | [diff] [blame] | 1103 | extern void unlink_file_vma(struct vm_area_struct *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1104 | extern struct vm_area_struct *copy_vma(struct vm_area_struct **, |
| 1105 | unsigned long addr, unsigned long len, pgoff_t pgoff); |
| 1106 | extern void exit_mmap(struct mm_struct *); |
Matt Helsley | 925d1c4 | 2008-04-29 01:01:36 -0700 | [diff] [blame] | 1107 | |
Andrea Arcangeli | 7906d00 | 2008-07-28 15:46:26 -0700 | [diff] [blame] | 1108 | extern int mm_take_all_locks(struct mm_struct *mm); |
| 1109 | extern void mm_drop_all_locks(struct mm_struct *mm); |
| 1110 | |
Matt Helsley | 925d1c4 | 2008-04-29 01:01:36 -0700 | [diff] [blame] | 1111 | #ifdef CONFIG_PROC_FS |
| 1112 | /* From fs/proc/base.c. callers must _not_ hold the mm's exe_file_lock */ |
| 1113 | extern void added_exe_file_vma(struct mm_struct *mm); |
| 1114 | extern void removed_exe_file_vma(struct mm_struct *mm); |
| 1115 | #else |
| 1116 | static inline void added_exe_file_vma(struct mm_struct *mm) |
| 1117 | {} |
| 1118 | |
| 1119 | static inline void removed_exe_file_vma(struct mm_struct *mm) |
| 1120 | {} |
| 1121 | #endif /* CONFIG_PROC_FS */ |
| 1122 | |
akpm@osdl.org | 119f657 | 2005-05-01 08:58:35 -0700 | [diff] [blame] | 1123 | extern int may_expand_vm(struct mm_struct *mm, unsigned long npages); |
Roland McGrath | fa5dc22 | 2007-02-08 14:20:41 -0800 | [diff] [blame] | 1124 | extern int install_special_mapping(struct mm_struct *mm, |
| 1125 | unsigned long addr, unsigned long len, |
| 1126 | unsigned long flags, struct page **pages); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1127 | |
| 1128 | extern unsigned long get_unmapped_area(struct file *, unsigned long, unsigned long, unsigned long, unsigned long); |
| 1129 | |
| 1130 | extern unsigned long do_mmap_pgoff(struct file *file, unsigned long addr, |
| 1131 | unsigned long len, unsigned long prot, |
| 1132 | unsigned long flag, unsigned long pgoff); |
Miklos Szeredi | 0165ab4 | 2007-07-15 23:38:26 -0700 | [diff] [blame] | 1133 | extern unsigned long mmap_region(struct file *file, unsigned long addr, |
| 1134 | unsigned long len, unsigned long flags, |
Mel Gorman | 5a6fe12 | 2009-02-10 14:02:27 +0000 | [diff] [blame] | 1135 | unsigned int vm_flags, unsigned long pgoff); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1136 | |
| 1137 | static inline unsigned long do_mmap(struct file *file, unsigned long addr, |
| 1138 | unsigned long len, unsigned long prot, |
| 1139 | unsigned long flag, unsigned long offset) |
| 1140 | { |
| 1141 | unsigned long ret = -EINVAL; |
| 1142 | if ((offset + PAGE_ALIGN(len)) < offset) |
| 1143 | goto out; |
| 1144 | if (!(offset & ~PAGE_MASK)) |
| 1145 | ret = do_mmap_pgoff(file, addr, len, prot, flag, offset >> PAGE_SHIFT); |
| 1146 | out: |
| 1147 | return ret; |
| 1148 | } |
| 1149 | |
| 1150 | extern int do_munmap(struct mm_struct *, unsigned long, size_t); |
| 1151 | |
| 1152 | extern unsigned long do_brk(unsigned long, unsigned long); |
| 1153 | |
| 1154 | /* filemap.c */ |
| 1155 | extern unsigned long page_unuse(struct page *); |
| 1156 | extern void truncate_inode_pages(struct address_space *, loff_t); |
Hans Reiser | d733907 | 2006-01-06 00:10:36 -0800 | [diff] [blame] | 1157 | extern void truncate_inode_pages_range(struct address_space *, |
| 1158 | loff_t lstart, loff_t lend); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1159 | |
| 1160 | /* generic vm_area_ops exported for stackable file systems */ |
Nick Piggin | d0217ac | 2007-07-19 01:47:03 -0700 | [diff] [blame] | 1161 | extern int filemap_fault(struct vm_area_struct *, struct vm_fault *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1162 | |
| 1163 | /* mm/page-writeback.c */ |
| 1164 | int write_one_page(struct page *page, int wait); |
Nick Piggin | 1cf6e7d | 2009-02-18 14:48:18 -0800 | [diff] [blame] | 1165 | void task_dirty_inc(struct task_struct *tsk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1166 | |
| 1167 | /* readahead.c */ |
| 1168 | #define VM_MAX_READAHEAD 128 /* kbytes */ |
| 1169 | #define VM_MIN_READAHEAD 16 /* kbytes (includes current page) */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1170 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1171 | int force_page_cache_readahead(struct address_space *mapping, struct file *filp, |
Andrew Morton | 7361f4d | 2005-11-07 00:59:28 -0800 | [diff] [blame] | 1172 | pgoff_t offset, unsigned long nr_to_read); |
Rusty Russell | cf914a7 | 2007-07-19 01:48:08 -0700 | [diff] [blame] | 1173 | |
| 1174 | void page_cache_sync_readahead(struct address_space *mapping, |
| 1175 | struct file_ra_state *ra, |
| 1176 | struct file *filp, |
| 1177 | pgoff_t offset, |
| 1178 | unsigned long size); |
| 1179 | |
| 1180 | void page_cache_async_readahead(struct address_space *mapping, |
| 1181 | struct file_ra_state *ra, |
| 1182 | struct file *filp, |
| 1183 | struct page *pg, |
| 1184 | pgoff_t offset, |
| 1185 | unsigned long size); |
| 1186 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1187 | unsigned long max_sane_readahead(unsigned long nr); |
Wu Fengguang | d30a110 | 2009-06-16 15:31:30 -0700 | [diff] [blame] | 1188 | unsigned long ra_submit(struct file_ra_state *ra, |
| 1189 | struct address_space *mapping, |
| 1190 | struct file *filp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1191 | |
| 1192 | /* Do stack extension */ |
Hugh Dickins | 46dea3d | 2005-10-29 18:16:20 -0700 | [diff] [blame] | 1193 | extern int expand_stack(struct vm_area_struct *vma, unsigned long address); |
Matthew Wilcox | 9ab8851 | 2005-11-18 16:16:42 -0500 | [diff] [blame] | 1194 | #ifdef CONFIG_IA64 |
Hugh Dickins | 46dea3d | 2005-10-29 18:16:20 -0700 | [diff] [blame] | 1195 | extern int expand_upwards(struct vm_area_struct *vma, unsigned long address); |
Matthew Wilcox | 9ab8851 | 2005-11-18 16:16:42 -0500 | [diff] [blame] | 1196 | #endif |
Ollie Wild | b6a2fea | 2007-07-19 01:48:16 -0700 | [diff] [blame] | 1197 | extern int expand_stack_downwards(struct vm_area_struct *vma, |
| 1198 | unsigned long address); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1199 | |
| 1200 | /* Look up the first VMA which satisfies addr < vm_end, NULL if none. */ |
| 1201 | extern struct vm_area_struct * find_vma(struct mm_struct * mm, unsigned long addr); |
| 1202 | extern struct vm_area_struct * find_vma_prev(struct mm_struct * mm, unsigned long addr, |
| 1203 | struct vm_area_struct **pprev); |
| 1204 | |
| 1205 | /* Look up the first VMA which intersects the interval start_addr..end_addr-1, |
| 1206 | NULL if none. Assume start_addr < end_addr. */ |
| 1207 | static inline struct vm_area_struct * find_vma_intersection(struct mm_struct * mm, unsigned long start_addr, unsigned long end_addr) |
| 1208 | { |
| 1209 | struct vm_area_struct * vma = find_vma(mm,start_addr); |
| 1210 | |
| 1211 | if (vma && end_addr <= vma->vm_start) |
| 1212 | vma = NULL; |
| 1213 | return vma; |
| 1214 | } |
| 1215 | |
| 1216 | static inline unsigned long vma_pages(struct vm_area_struct *vma) |
| 1217 | { |
| 1218 | return (vma->vm_end - vma->vm_start) >> PAGE_SHIFT; |
| 1219 | } |
| 1220 | |
Hugh Dickins | 804af2c | 2006-07-26 21:39:49 +0100 | [diff] [blame] | 1221 | pgprot_t vm_get_page_prot(unsigned long vm_flags); |
Hugh Dickins | deceb6c | 2005-10-29 18:16:33 -0700 | [diff] [blame] | 1222 | 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] | 1223 | int remap_pfn_range(struct vm_area_struct *, unsigned long addr, |
| 1224 | unsigned long pfn, unsigned long size, pgprot_t); |
Linus Torvalds | a145dd4 | 2005-11-30 09:35:19 -0800 | [diff] [blame] | 1225 | 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] | 1226 | int vm_insert_pfn(struct vm_area_struct *vma, unsigned long addr, |
| 1227 | unsigned long pfn); |
Nick Piggin | 423bad6 | 2008-04-28 02:13:01 -0700 | [diff] [blame] | 1228 | int vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr, |
| 1229 | unsigned long pfn); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1230 | |
Linus Torvalds | 6aab341 | 2005-11-28 14:34:23 -0800 | [diff] [blame] | 1231 | struct page *follow_page(struct vm_area_struct *, unsigned long address, |
Hugh Dickins | deceb6c | 2005-10-29 18:16:33 -0700 | [diff] [blame] | 1232 | unsigned int foll_flags); |
| 1233 | #define FOLL_WRITE 0x01 /* check pte is writable */ |
| 1234 | #define FOLL_TOUCH 0x02 /* mark page accessed */ |
| 1235 | #define FOLL_GET 0x04 /* do get_page on page */ |
| 1236 | #define FOLL_ANON 0x08 /* give ZERO_PAGE if no pgtable */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1237 | |
Martin Schwidefsky | 2f569af | 2008-02-08 04:22:04 -0800 | [diff] [blame] | 1238 | 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] | 1239 | void *data); |
| 1240 | extern int apply_to_page_range(struct mm_struct *mm, unsigned long address, |
| 1241 | unsigned long size, pte_fn_t fn, void *data); |
| 1242 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1243 | #ifdef CONFIG_PROC_FS |
Hugh Dickins | ab50b8e | 2005-10-29 18:15:56 -0700 | [diff] [blame] | 1244 | void vm_stat_account(struct mm_struct *, unsigned long, struct file *, long); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1245 | #else |
Hugh Dickins | ab50b8e | 2005-10-29 18:15:56 -0700 | [diff] [blame] | 1246 | static inline void vm_stat_account(struct mm_struct *mm, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1247 | unsigned long flags, struct file *file, long pages) |
| 1248 | { |
| 1249 | } |
| 1250 | #endif /* CONFIG_PROC_FS */ |
| 1251 | |
Ingo Molnar | 12d6f21 | 2008-01-30 13:33:58 +0100 | [diff] [blame] | 1252 | #ifdef CONFIG_DEBUG_PAGEALLOC |
| 1253 | extern int debug_pagealloc_enabled; |
| 1254 | |
| 1255 | extern void kernel_map_pages(struct page *page, int numpages, int enable); |
| 1256 | |
| 1257 | static inline void enable_debug_pagealloc(void) |
| 1258 | { |
| 1259 | debug_pagealloc_enabled = 1; |
| 1260 | } |
Rafael J. Wysocki | 8a235ef | 2008-02-20 01:47:44 +0100 | [diff] [blame] | 1261 | #ifdef CONFIG_HIBERNATION |
| 1262 | extern bool kernel_page_present(struct page *page); |
| 1263 | #endif /* CONFIG_HIBERNATION */ |
Ingo Molnar | 12d6f21 | 2008-01-30 13:33:58 +0100 | [diff] [blame] | 1264 | #else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1265 | static inline void |
Nick Piggin | 9858db5 | 2006-10-11 01:21:30 -0700 | [diff] [blame] | 1266 | kernel_map_pages(struct page *page, int numpages, int enable) {} |
Ingo Molnar | 12d6f21 | 2008-01-30 13:33:58 +0100 | [diff] [blame] | 1267 | static inline void enable_debug_pagealloc(void) |
| 1268 | { |
| 1269 | } |
Rafael J. Wysocki | 8a235ef | 2008-02-20 01:47:44 +0100 | [diff] [blame] | 1270 | #ifdef CONFIG_HIBERNATION |
| 1271 | static inline bool kernel_page_present(struct page *page) { return true; } |
| 1272 | #endif /* CONFIG_HIBERNATION */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1273 | #endif |
| 1274 | |
| 1275 | extern struct vm_area_struct *get_gate_vma(struct task_struct *tsk); |
| 1276 | #ifdef __HAVE_ARCH_GATE_AREA |
| 1277 | int in_gate_area_no_task(unsigned long addr); |
| 1278 | int in_gate_area(struct task_struct *task, unsigned long addr); |
| 1279 | #else |
| 1280 | int in_gate_area_no_task(unsigned long addr); |
| 1281 | #define in_gate_area(task, addr) ({(void)task; in_gate_area_no_task(addr);}) |
| 1282 | #endif /* __HAVE_ARCH_GATE_AREA */ |
| 1283 | |
Andrew Morton | 9d0243b | 2006-01-08 01:00:39 -0800 | [diff] [blame] | 1284 | int drop_caches_sysctl_handler(struct ctl_table *, int, struct file *, |
| 1285 | void __user *, size_t *, loff_t *); |
Andrew Morton | 69e0594 | 2006-03-22 00:08:19 -0800 | [diff] [blame] | 1286 | unsigned long shrink_slab(unsigned long scanned, gfp_t gfp_mask, |
Andrew Morton | 9d0243b | 2006-01-08 01:00:39 -0800 | [diff] [blame] | 1287 | unsigned long lru_pages); |
Andrew Morton | 9d0243b | 2006-01-08 01:00:39 -0800 | [diff] [blame] | 1288 | |
Luke Yang | 7a9166e | 2006-02-20 18:28:07 -0800 | [diff] [blame] | 1289 | #ifndef CONFIG_MMU |
| 1290 | #define randomize_va_space 0 |
| 1291 | #else |
Andi Kleen | a62eaf1 | 2006-02-16 23:41:58 +0100 | [diff] [blame] | 1292 | extern int randomize_va_space; |
Luke Yang | 7a9166e | 2006-02-20 18:28:07 -0800 | [diff] [blame] | 1293 | #endif |
Andi Kleen | a62eaf1 | 2006-02-16 23:41:58 +0100 | [diff] [blame] | 1294 | |
Sam Ravnborg | 045e72a | 2007-07-26 10:41:13 -0700 | [diff] [blame] | 1295 | const char * arch_vma_name(struct vm_area_struct *vma); |
Andi Kleen | 0325291 | 2008-01-30 13:33:18 +0100 | [diff] [blame] | 1296 | void print_vma_addr(char *prefix, unsigned long rip); |
Ingo Molnar | e6e5494 | 2006-06-27 02:53:50 -0700 | [diff] [blame] | 1297 | |
Yasunori Goto | 98f3cfc | 2007-10-16 01:26:14 -0700 | [diff] [blame] | 1298 | struct page *sparse_mem_map_populate(unsigned long pnum, int nid); |
Andy Whitcroft | 29c7111 | 2007-10-16 01:24:14 -0700 | [diff] [blame] | 1299 | pgd_t *vmemmap_pgd_populate(unsigned long addr, int node); |
| 1300 | pud_t *vmemmap_pud_populate(pgd_t *pgd, unsigned long addr, int node); |
| 1301 | pmd_t *vmemmap_pmd_populate(pud_t *pud, unsigned long addr, int node); |
| 1302 | 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] | 1303 | void *vmemmap_alloc_block(unsigned long size, int node); |
| 1304 | void vmemmap_verify(pte_t *, int, unsigned long, unsigned long); |
Andy Whitcroft | 29c7111 | 2007-10-16 01:24:14 -0700 | [diff] [blame] | 1305 | int vmemmap_populate_basepages(struct page *start_page, |
| 1306 | unsigned long pages, int node); |
| 1307 | int vmemmap_populate(struct page *start_page, unsigned long pages, int node); |
Yinghai Lu | c2b91e2 | 2008-04-12 01:19:24 -0700 | [diff] [blame] | 1308 | void vmemmap_populate_print_last(void); |
Christoph Lameter | 8f6aac4 | 2007-10-16 01:24:13 -0700 | [diff] [blame] | 1309 | |
Markus Metzger | 1cb81b1 | 2009-04-24 09:51:43 +0200 | [diff] [blame] | 1310 | extern int account_locked_memory(struct mm_struct *mm, struct rlimit *rlim, |
| 1311 | size_t size); |
| 1312 | extern void refund_locked_memory(struct mm_struct *mm, size_t size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1313 | #endif /* __KERNEL__ */ |
| 1314 | #endif /* _LINUX_MM_H */ |