Blame view
mm/nommu.c
53.2 KB
1da177e4c Linux-2.6.12-rc2 |
1 2 3 4 5 6 7 8 |
/* * linux/mm/nommu.c * * Replacement code for mm functions to support CPU's that don't * have any form of memory management unit (thus no virtual memory). * * See Documentation/nommu-mmap.txt * |
8feae1311 NOMMU: Make VMAs ... |
9 |
* Copyright (c) 2004-2008 David Howells <dhowells@redhat.com> |
1da177e4c Linux-2.6.12-rc2 |
10 11 12 |
* Copyright (c) 2000-2003 David McCullough <davidm@snapgear.com> * Copyright (c) 2000-2001 D Jeff Dionne <jeff@uClinux.org> * Copyright (c) 2002 Greg Ungerer <gerg@snapgear.com> |
29c185e5c nommu: Provide st... |
13 |
* Copyright (c) 2007-2010 Paul Mundt <lethal@linux-sh.org> |
1da177e4c Linux-2.6.12-rc2 |
14 |
*/ |
b95f1b31b mm: Map most file... |
15 |
#include <linux/export.h> |
1da177e4c Linux-2.6.12-rc2 |
16 17 18 19 20 21 22 23 |
#include <linux/mm.h> #include <linux/mman.h> #include <linux/swap.h> #include <linux/file.h> #include <linux/highmem.h> #include <linux/pagemap.h> #include <linux/slab.h> #include <linux/vmalloc.h> |
1da177e4c Linux-2.6.12-rc2 |
24 25 26 27 28 29 |
#include <linux/blkdev.h> #include <linux/backing-dev.h> #include <linux/mount.h> #include <linux/personality.h> #include <linux/security.h> #include <linux/syscalls.h> |
120a795da audit mmap |
30 |
#include <linux/audit.h> |
cf4aebc29 sched: Move sched... |
31 |
#include <linux/sched/sysctl.h> |
1da177e4c Linux-2.6.12-rc2 |
32 33 34 35 |
#include <asm/uaccess.h> #include <asm/tlb.h> #include <asm/tlbflush.h> |
eb8cdec4a nommu: add suppor... |
36 |
#include <asm/mmu_context.h> |
8feae1311 NOMMU: Make VMAs ... |
37 |
#include "internal.h" |
8feae1311 NOMMU: Make VMAs ... |
38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 |
#if 0 #define kenter(FMT, ...) \ printk(KERN_DEBUG "==> %s("FMT") ", __func__, ##__VA_ARGS__) #define kleave(FMT, ...) \ printk(KERN_DEBUG "<== %s()"FMT" ", __func__, ##__VA_ARGS__) #define kdebug(FMT, ...) \ printk(KERN_DEBUG "xxx" FMT"yyy ", ##__VA_ARGS__) #else #define kenter(FMT, ...) \ no_printk(KERN_DEBUG "==> %s("FMT") ", __func__, ##__VA_ARGS__) #define kleave(FMT, ...) \ no_printk(KERN_DEBUG "<== %s()"FMT" ", __func__, ##__VA_ARGS__) #define kdebug(FMT, ...) \ no_printk(KERN_DEBUG FMT" ", ##__VA_ARGS__) #endif |
1da177e4c Linux-2.6.12-rc2 |
59 60 61 62 63 |
void *high_memory; struct page *mem_map; unsigned long max_mapnr; unsigned long num_physpages; |
4266c97a3 nommu: fix two bu... |
64 |
unsigned long highest_memmap_pfn; |
00a62ce91 mm: fix Committed... |
65 |
struct percpu_counter vm_committed_as; |
1da177e4c Linux-2.6.12-rc2 |
66 67 68 |
int sysctl_overcommit_memory = OVERCOMMIT_GUESS; /* heuristic overcommit */ int sysctl_overcommit_ratio = 50; /* default is 50% */ int sysctl_max_map_count = DEFAULT_MAX_MAP_COUNT; |
fc4d5c292 nommu: make the i... |
69 |
int sysctl_nr_trim_pages = CONFIG_NOMMU_INITIAL_TRIM_EXCESS; |
c9b1d0981 mm: limit growth ... |
70 |
unsigned long sysctl_user_reserve_kbytes __read_mostly = 1UL << 17; /* 128MB */ |
4eeab4f55 mm: replace hardc... |
71 |
unsigned long sysctl_admin_reserve_kbytes __read_mostly = 1UL << 13; /* 8MB */ |
1da177e4c Linux-2.6.12-rc2 |
72 |
int heap_stack_gap = 0; |
33e5d7697 nommu: fix a numb... |
73 |
atomic_long_t mmap_pages_allocated; |
8feae1311 NOMMU: Make VMAs ... |
74 |
|
997071bcb mm: export a func... |
75 76 77 78 79 80 81 82 83 84 85 86 87 88 |
/* * The global memory commitment made in the system can be a metric * that can be used to drive ballooning decisions when Linux is hosted * as a guest. On Hyper-V, the host implements a policy engine for dynamically * balancing memory across competing virtual machines that are hosted. * Several metrics drive this policy engine including the guest reported * memory commitment. */ unsigned long vm_memory_committed(void) { return percpu_counter_read_positive(&vm_committed_as); } EXPORT_SYMBOL_GPL(vm_memory_committed); |
1da177e4c Linux-2.6.12-rc2 |
89 |
EXPORT_SYMBOL(mem_map); |
6a04de6db [PATCH] nommu: fi... |
90 |
EXPORT_SYMBOL(num_physpages); |
1da177e4c Linux-2.6.12-rc2 |
91 |
|
8feae1311 NOMMU: Make VMAs ... |
92 93 94 95 |
/* list of mapped, potentially shareable regions */ static struct kmem_cache *vm_region_jar; struct rb_root nommu_region_tree = RB_ROOT; DECLARE_RWSEM(nommu_region_sem); |
1da177e4c Linux-2.6.12-rc2 |
96 |
|
f0f37e2f7 const: mark struc... |
97 |
const struct vm_operations_struct generic_file_vm_ops = { |
1da177e4c Linux-2.6.12-rc2 |
98 99 100 |
}; /* |
1da177e4c Linux-2.6.12-rc2 |
101 102 103 104 105 106 107 108 |
* Return the total memory allocated for this pointer, not * just what the caller asked for. * * Doesn't have to be accurate, i.e. may have races. */ unsigned int kobjsize(const void *objp) { struct page *page; |
4016a1390 mm/nommu.c: retur... |
109 110 111 112 |
/* * If the object we have should not have ksize performed on it, * return size of 0 */ |
5a1603be5 nommu: Correct ko... |
113 |
if (!objp || !virt_addr_valid(objp)) |
6cfd53fc0 nommu: fix kobjsi... |
114 115 116 |
return 0; page = virt_to_head_page(objp); |
6cfd53fc0 nommu: fix kobjsi... |
117 118 119 120 121 |
/* * If the allocator sets PageSlab, we know the pointer came from * kmalloc(). */ |
1da177e4c Linux-2.6.12-rc2 |
122 123 |
if (PageSlab(page)) return ksize(objp); |
6cfd53fc0 nommu: fix kobjsi... |
124 |
/* |
ab2e83ead NOMMU: Teach kobj... |
125 126 127 128 129 130 131 132 133 134 135 136 137 138 |
* If it's not a compound page, see if we have a matching VMA * region. This test is intentionally done in reverse order, * so if there's no VMA, we still fall through and hand back * PAGE_SIZE for 0-order pages. */ if (!PageCompound(page)) { struct vm_area_struct *vma; vma = find_vma(current->mm, (unsigned long)objp); if (vma) return vma->vm_end - vma->vm_start; } /* |
6cfd53fc0 nommu: fix kobjsi... |
139 |
* The ksize() function is only guaranteed to work for pointers |
5a1603be5 nommu: Correct ko... |
140 |
* returned by kmalloc(). So handle arbitrary pointers here. |
6cfd53fc0 nommu: fix kobjsi... |
141 |
*/ |
5a1603be5 nommu: Correct ko... |
142 |
return PAGE_SIZE << compound_order(page); |
1da177e4c Linux-2.6.12-rc2 |
143 |
} |
28a35716d mm: use long type... |
144 145 146 147 |
long __get_user_pages(struct task_struct *tsk, struct mm_struct *mm, unsigned long start, unsigned long nr_pages, unsigned int foll_flags, struct page **pages, struct vm_area_struct **vmas, int *nonblocking) |
1da177e4c Linux-2.6.12-rc2 |
148 |
{ |
910e46da4 [PATCH] Check if ... |
149 |
struct vm_area_struct *vma; |
7b4d5b8b3 [PATCH] NOMMU: Ch... |
150 151 152 153 |
unsigned long vm_flags; int i; /* calculate required read or write permissions. |
58fa879e1 mm: FOLL flags fo... |
154 |
* If FOLL_FORCE is set, we only require the "MAY" flags. |
7b4d5b8b3 [PATCH] NOMMU: Ch... |
155 |
*/ |
58fa879e1 mm: FOLL flags fo... |
156 157 158 159 |
vm_flags = (foll_flags & FOLL_WRITE) ? (VM_WRITE | VM_MAYWRITE) : (VM_READ | VM_MAYREAD); vm_flags &= (foll_flags & FOLL_FORCE) ? (VM_MAYREAD | VM_MAYWRITE) : (VM_READ | VM_WRITE); |
1da177e4c Linux-2.6.12-rc2 |
160 |
|
9d73777e5 clarify get_user_... |
161 |
for (i = 0; i < nr_pages; i++) { |
7561e8ca0 NOMMU: Revert 'no... |
162 |
vma = find_vma(mm, start); |
7b4d5b8b3 [PATCH] NOMMU: Ch... |
163 164 165 166 |
if (!vma) goto finish_or_fault; /* protect what we can, including chardevs */ |
1c3aff1ce mm: remove unused... |
167 168 |
if ((vma->vm_flags & (VM_IO | VM_PFNMAP)) || !(vm_flags & vma->vm_flags)) |
7b4d5b8b3 [PATCH] NOMMU: Ch... |
169 |
goto finish_or_fault; |
910e46da4 [PATCH] Check if ... |
170 |
|
1da177e4c Linux-2.6.12-rc2 |
171 172 173 174 175 176 |
if (pages) { pages[i] = virt_to_page(start); if (pages[i]) page_cache_get(pages[i]); } if (vmas) |
910e46da4 [PATCH] Check if ... |
177 |
vmas[i] = vma; |
e1ee65d85 NOMMU: Fix __get_... |
178 |
start = (start + PAGE_SIZE) & PAGE_MASK; |
1da177e4c Linux-2.6.12-rc2 |
179 |
} |
7b4d5b8b3 [PATCH] NOMMU: Ch... |
180 181 182 183 184 |
return i; finish_or_fault: return i ? : -EFAULT; |
1da177e4c Linux-2.6.12-rc2 |
185 |
} |
b291f0003 mlock: mlocked pa... |
186 |
|
b291f0003 mlock: mlocked pa... |
187 188 189 190 191 192 193 |
/* * get a list of pages in an address range belonging to the specified process * and indicate the VMA that covers each page * - this is potentially dodgy as we may end incrementing the page count of a * slab page or a secondary page from a compound page * - don't permit access to VMAs that don't support it, such as I/O mappings */ |
28a35716d mm: use long type... |
194 195 196 197 |
long get_user_pages(struct task_struct *tsk, struct mm_struct *mm, unsigned long start, unsigned long nr_pages, int write, int force, struct page **pages, struct vm_area_struct **vmas) |
b291f0003 mlock: mlocked pa... |
198 199 200 201 |
{ int flags = 0; if (write) |
58fa879e1 mm: FOLL flags fo... |
202 |
flags |= FOLL_WRITE; |
b291f0003 mlock: mlocked pa... |
203 |
if (force) |
58fa879e1 mm: FOLL flags fo... |
204 |
flags |= FOLL_FORCE; |
b291f0003 mlock: mlocked pa... |
205 |
|
53a7706d5 mlock: do not hol... |
206 207 |
return __get_user_pages(tsk, mm, start, nr_pages, flags, pages, vmas, NULL); |
b291f0003 mlock: mlocked pa... |
208 |
} |
66aa2b4b1 [PATCH] uclinux: ... |
209 |
EXPORT_SYMBOL(get_user_pages); |
dfc2f91ac nommu: provide fo... |
210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 |
/** * follow_pfn - look up PFN at a user virtual address * @vma: memory mapping * @address: user virtual address * @pfn: location to store found PFN * * Only IO mappings and raw PFN mappings are allowed. * * Returns zero and the pfn at @pfn on success, -ve otherwise. */ int follow_pfn(struct vm_area_struct *vma, unsigned long address, unsigned long *pfn) { if (!(vma->vm_flags & (VM_IO | VM_PFNMAP))) return -EINVAL; *pfn = address >> PAGE_SHIFT; return 0; } EXPORT_SYMBOL(follow_pfn); |
f1c4069e1 mm, vmalloc: expo... |
230 |
LIST_HEAD(vmap_area_list); |
1da177e4c Linux-2.6.12-rc2 |
231 |
|
b3bdda02a vmalloc: add cons... |
232 |
void vfree(const void *addr) |
1da177e4c Linux-2.6.12-rc2 |
233 234 235 |
{ kfree(addr); } |
b50731732 nommu: vmalloc_32... |
236 |
EXPORT_SYMBOL(vfree); |
1da177e4c Linux-2.6.12-rc2 |
237 |
|
dd0fc66fb [PATCH] gfp flags... |
238 |
void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot) |
1da177e4c Linux-2.6.12-rc2 |
239 240 |
{ /* |
8518609de Explain clearly w... |
241 242 |
* You can't specify __GFP_HIGHMEM with kmalloc() since kmalloc() * returns only a logical address. |
1da177e4c Linux-2.6.12-rc2 |
243 |
*/ |
84097518d [PATCH] mm: nommu... |
244 |
return kmalloc(size, (gfp_mask | __GFP_COMP) & ~__GFP_HIGHMEM); |
1da177e4c Linux-2.6.12-rc2 |
245 |
} |
b50731732 nommu: vmalloc_32... |
246 |
EXPORT_SYMBOL(__vmalloc); |
1da177e4c Linux-2.6.12-rc2 |
247 |
|
f905bc447 nommu: add new vm... |
248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 |
void *vmalloc_user(unsigned long size) { void *ret; ret = __vmalloc(size, GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO, PAGE_KERNEL); if (ret) { struct vm_area_struct *vma; down_write(¤t->mm->mmap_sem); vma = find_vma(current->mm, (unsigned long)ret); if (vma) vma->vm_flags |= VM_USERMAP; up_write(¤t->mm->mmap_sem); } return ret; } EXPORT_SYMBOL(vmalloc_user); |
b3bdda02a vmalloc: add cons... |
267 |
struct page *vmalloc_to_page(const void *addr) |
1da177e4c Linux-2.6.12-rc2 |
268 269 270 |
{ return virt_to_page(addr); } |
b50731732 nommu: vmalloc_32... |
271 |
EXPORT_SYMBOL(vmalloc_to_page); |
1da177e4c Linux-2.6.12-rc2 |
272 |
|
b3bdda02a vmalloc: add cons... |
273 |
unsigned long vmalloc_to_pfn(const void *addr) |
1da177e4c Linux-2.6.12-rc2 |
274 275 276 |
{ return page_to_pfn(virt_to_page(addr)); } |
b50731732 nommu: vmalloc_32... |
277 |
EXPORT_SYMBOL(vmalloc_to_pfn); |
1da177e4c Linux-2.6.12-rc2 |
278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 |
long vread(char *buf, char *addr, unsigned long count) { memcpy(buf, addr, count); return count; } long vwrite(char *buf, char *addr, unsigned long count) { /* Don't allow overflow */ if ((unsigned long) addr + count < count) count = -(unsigned long) addr; memcpy(addr, buf, count); return(count); } /* * vmalloc - allocate virtually continguos memory * * @size: allocation size * * Allocate enough pages to cover @size from the page level * allocator and map them into continguos kernel virtual space. * |
c1c8897f8 Spelling fix: "co... |
303 |
* For tight control over page level allocator and protection flags |
1da177e4c Linux-2.6.12-rc2 |
304 305 306 307 308 309 |
* use __vmalloc() instead. */ void *vmalloc(unsigned long size) { return __vmalloc(size, GFP_KERNEL | __GFP_HIGHMEM, PAGE_KERNEL); } |
f61388822 [PATCH] nommu: im... |
310 |
EXPORT_SYMBOL(vmalloc); |
e1ca7788d mm: add vzalloc()... |
311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 |
/* * vzalloc - allocate virtually continguos memory with zero fill * * @size: allocation size * * Allocate enough pages to cover @size from the page level * allocator and map them into continguos kernel virtual space. * The memory allocated is set to zero. * * For tight control over page level allocator and protection flags * use __vmalloc() instead. */ void *vzalloc(unsigned long size) { return __vmalloc(size, GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO, PAGE_KERNEL); } EXPORT_SYMBOL(vzalloc); /** * vmalloc_node - allocate memory on a specific node * @size: allocation size * @node: numa node * * Allocate enough pages to cover @size from the page level * allocator and map them into contiguous kernel virtual space. * * For tight control over page level allocator and protection flags * use __vmalloc() instead. */ |
f61388822 [PATCH] nommu: im... |
341 342 343 344 |
void *vmalloc_node(unsigned long size, int node) { return vmalloc(size); } |
9a14f653d nommu: Fix up vma... |
345 |
EXPORT_SYMBOL(vmalloc_node); |
e1ca7788d mm: add vzalloc()... |
346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 |
/** * vzalloc_node - allocate memory on a specific node with zero fill * @size: allocation size * @node: numa node * * Allocate enough pages to cover @size from the page level * allocator and map them into contiguous kernel virtual space. * The memory allocated is set to zero. * * For tight control over page level allocator and protection flags * use __vmalloc() instead. */ void *vzalloc_node(unsigned long size, int node) { return vzalloc(size); } EXPORT_SYMBOL(vzalloc_node); |
1da177e4c Linux-2.6.12-rc2 |
364 |
|
1af446edf nommu: Provide vm... |
365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 |
#ifndef PAGE_KERNEL_EXEC # define PAGE_KERNEL_EXEC PAGE_KERNEL #endif /** * vmalloc_exec - allocate virtually contiguous, executable memory * @size: allocation size * * Kernel-internal function to allocate enough pages to cover @size * the page level allocator and map them into contiguous and * executable kernel virtual space. * * For tight control over page level allocator and protection flags * use __vmalloc() instead. */ void *vmalloc_exec(unsigned long size) { return __vmalloc(size, GFP_KERNEL | __GFP_HIGHMEM, PAGE_KERNEL_EXEC); } |
b50731732 nommu: vmalloc_32... |
385 386 |
/** * vmalloc_32 - allocate virtually contiguous memory (32bit addressable) |
1da177e4c Linux-2.6.12-rc2 |
387 388 389 390 391 392 393 394 395 |
* @size: allocation size * * Allocate enough 32bit PA addressable pages to cover @size from the * page level allocator and map them into continguos kernel virtual space. */ void *vmalloc_32(unsigned long size) { return __vmalloc(size, GFP_KERNEL, PAGE_KERNEL); } |
b50731732 nommu: vmalloc_32... |
396 397 398 399 400 401 402 403 |
EXPORT_SYMBOL(vmalloc_32); /** * vmalloc_32_user - allocate zeroed virtually contiguous 32bit memory * @size: allocation size * * The resulting memory area is 32bit addressable and zeroed so it can be * mapped to userspace without leaking data. |
f905bc447 nommu: add new vm... |
404 405 406 |
* * VM_USERMAP is set on the corresponding VMA so that subsequent calls to * remap_vmalloc_range() are permissible. |
b50731732 nommu: vmalloc_32... |
407 408 409 |
*/ void *vmalloc_32_user(unsigned long size) { |
f905bc447 nommu: add new vm... |
410 411 412 413 414 |
/* * We'll have to sort out the ZONE_DMA bits for 64-bit, * but for now this can simply use vmalloc_user() directly. */ return vmalloc_user(size); |
b50731732 nommu: vmalloc_32... |
415 416 |
} EXPORT_SYMBOL(vmalloc_32_user); |
1da177e4c Linux-2.6.12-rc2 |
417 418 419 420 421 422 |
void *vmap(struct page **pages, unsigned int count, unsigned long flags, pgprot_t prot) { BUG(); return NULL; } |
b50731732 nommu: vmalloc_32... |
423 |
EXPORT_SYMBOL(vmap); |
1da177e4c Linux-2.6.12-rc2 |
424 |
|
b3bdda02a vmalloc: add cons... |
425 |
void vunmap(const void *addr) |
1da177e4c Linux-2.6.12-rc2 |
426 427 428 |
{ BUG(); } |
b50731732 nommu: vmalloc_32... |
429 |
EXPORT_SYMBOL(vunmap); |
1da177e4c Linux-2.6.12-rc2 |
430 |
|
eb6434d9e nommu: Stub in vm... |
431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 |
void *vm_map_ram(struct page **pages, unsigned int count, int node, pgprot_t prot) { BUG(); return NULL; } EXPORT_SYMBOL(vm_map_ram); void vm_unmap_ram(const void *mem, unsigned int count) { BUG(); } EXPORT_SYMBOL(vm_unmap_ram); void vm_unmap_aliases(void) { } EXPORT_SYMBOL_GPL(vm_unmap_aliases); |
1da177e4c Linux-2.6.12-rc2 |
448 |
/* |
1eeb66a1b move die notifier... |
449 450 451 452 453 454 |
* Implement a stub for vmalloc_sync_all() if the architecture chose not to * have one. */ void __attribute__((weak)) vmalloc_sync_all(void) { } |
29c185e5c nommu: Provide st... |
455 456 457 458 459 460 461 462 463 464 465 466 |
/** * alloc_vm_area - allocate a range of kernel address space * @size: size of the area * * Returns: NULL on failure, vm_struct on success * * This function reserves a range of kernel address space, and * allocates pagetables to map that range. No actual mappings * are created. If the kernel address space is not shared * between processes, it syncs the pagetable across all * processes. */ |
cd12909cb xen: map foreign ... |
467 |
struct vm_struct *alloc_vm_area(size_t size, pte_t **ptes) |
29c185e5c nommu: Provide st... |
468 469 470 471 472 473 474 475 476 477 478 |
{ BUG(); return NULL; } EXPORT_SYMBOL_GPL(alloc_vm_area); void free_vm_area(struct vm_struct *area) { BUG(); } EXPORT_SYMBOL_GPL(free_vm_area); |
b50731732 nommu: vmalloc_32... |
479 480 481 482 483 484 |
int vm_insert_page(struct vm_area_struct *vma, unsigned long addr, struct page *page) { return -EINVAL; } EXPORT_SYMBOL(vm_insert_page); |
1eeb66a1b move die notifier... |
485 |
/* |
1da177e4c Linux-2.6.12-rc2 |
486 487 488 489 490 491 |
* sys_brk() for the most part doesn't need the global kernel * lock, except when an application is doing something nasty * like trying to un-brk an area that has already been mapped * to a regular file. in this case, the unmapping will need * to invoke file system routines that need the global lock. */ |
6a6160a7b [CVE-2009-0029] S... |
492 |
SYSCALL_DEFINE1(brk, unsigned long, brk) |
1da177e4c Linux-2.6.12-rc2 |
493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 |
{ struct mm_struct *mm = current->mm; if (brk < mm->start_brk || brk > mm->context.end_brk) return mm->brk; if (mm->brk == brk) return mm->brk; /* * Always allow shrinking brk */ if (brk <= mm->brk) { mm->brk = brk; return brk; } /* * Ok, looks good - let it rip. */ |
cfe79c00a NOMMU: Avoiding d... |
513 |
flush_icache_range(mm->brk, brk); |
1da177e4c Linux-2.6.12-rc2 |
514 515 |
return mm->brk = brk; } |
8feae1311 NOMMU: Make VMAs ... |
516 517 518 519 |
/* * initialise the VMA and region record slabs */ void __init mmap_init(void) |
1da177e4c Linux-2.6.12-rc2 |
520 |
{ |
00a62ce91 mm: fix Committed... |
521 522 523 524 |
int ret; ret = percpu_counter_init(&vm_committed_as, 0); VM_BUG_ON(ret); |
33e5d7697 nommu: fix a numb... |
525 |
vm_region_jar = KMEM_CACHE(vm_region, SLAB_PANIC); |
1da177e4c Linux-2.6.12-rc2 |
526 |
} |
1da177e4c Linux-2.6.12-rc2 |
527 |
|
3034097a5 [PATCH] NOMMU: Or... |
528 |
/* |
8feae1311 NOMMU: Make VMAs ... |
529 530 |
* validate the region tree * - the caller must hold the region lock |
3034097a5 [PATCH] NOMMU: Or... |
531 |
*/ |
8feae1311 NOMMU: Make VMAs ... |
532 533 |
#ifdef CONFIG_DEBUG_NOMMU_REGIONS static noinline void validate_nommu_regions(void) |
3034097a5 [PATCH] NOMMU: Or... |
534 |
{ |
8feae1311 NOMMU: Make VMAs ... |
535 536 |
struct vm_region *region, *last; struct rb_node *p, *lastp; |
3034097a5 [PATCH] NOMMU: Or... |
537 |
|
8feae1311 NOMMU: Make VMAs ... |
538 539 540 541 542 |
lastp = rb_first(&nommu_region_tree); if (!lastp) return; last = rb_entry(lastp, struct vm_region, vm_rb); |
33e5d7697 nommu: fix a numb... |
543 544 |
BUG_ON(unlikely(last->vm_end <= last->vm_start)); BUG_ON(unlikely(last->vm_top < last->vm_end)); |
8feae1311 NOMMU: Make VMAs ... |
545 546 547 548 |
while ((p = rb_next(lastp))) { region = rb_entry(p, struct vm_region, vm_rb); last = rb_entry(lastp, struct vm_region, vm_rb); |
33e5d7697 nommu: fix a numb... |
549 550 551 |
BUG_ON(unlikely(region->vm_end <= region->vm_start)); BUG_ON(unlikely(region->vm_top < region->vm_end)); BUG_ON(unlikely(region->vm_start < last->vm_top)); |
3034097a5 [PATCH] NOMMU: Or... |
552 |
|
8feae1311 NOMMU: Make VMAs ... |
553 554 |
lastp = p; } |
3034097a5 [PATCH] NOMMU: Or... |
555 |
} |
8feae1311 NOMMU: Make VMAs ... |
556 |
#else |
33e5d7697 nommu: fix a numb... |
557 558 559 |
static void validate_nommu_regions(void) { } |
8feae1311 NOMMU: Make VMAs ... |
560 |
#endif |
3034097a5 [PATCH] NOMMU: Or... |
561 562 |
/* |
8feae1311 NOMMU: Make VMAs ... |
563 |
* add a region into the global tree |
3034097a5 [PATCH] NOMMU: Or... |
564 |
*/ |
8feae1311 NOMMU: Make VMAs ... |
565 |
static void add_nommu_region(struct vm_region *region) |
3034097a5 [PATCH] NOMMU: Or... |
566 |
{ |
8feae1311 NOMMU: Make VMAs ... |
567 568 |
struct vm_region *pregion; struct rb_node **p, *parent; |
3034097a5 [PATCH] NOMMU: Or... |
569 |
|
8feae1311 NOMMU: Make VMAs ... |
570 |
validate_nommu_regions(); |
8feae1311 NOMMU: Make VMAs ... |
571 572 573 574 575 576 577 578 579 580 581 582 583 |
parent = NULL; p = &nommu_region_tree.rb_node; while (*p) { parent = *p; pregion = rb_entry(parent, struct vm_region, vm_rb); if (region->vm_start < pregion->vm_start) p = &(*p)->rb_left; else if (region->vm_start > pregion->vm_start) p = &(*p)->rb_right; else if (pregion == region) return; else BUG(); |
3034097a5 [PATCH] NOMMU: Or... |
584 |
} |
8feae1311 NOMMU: Make VMAs ... |
585 586 |
rb_link_node(®ion->vm_rb, parent, p); rb_insert_color(®ion->vm_rb, &nommu_region_tree); |
3034097a5 [PATCH] NOMMU: Or... |
587 |
|
8feae1311 NOMMU: Make VMAs ... |
588 |
validate_nommu_regions(); |
3034097a5 [PATCH] NOMMU: Or... |
589 |
} |
3034097a5 [PATCH] NOMMU: Or... |
590 591 |
/* |
8feae1311 NOMMU: Make VMAs ... |
592 |
* delete a region from the global tree |
930e652a2 [PATCH] NOMMU: Ma... |
593 |
*/ |
8feae1311 NOMMU: Make VMAs ... |
594 |
static void delete_nommu_region(struct vm_region *region) |
930e652a2 [PATCH] NOMMU: Ma... |
595 |
{ |
8feae1311 NOMMU: Make VMAs ... |
596 |
BUG_ON(!nommu_region_tree.rb_node); |
930e652a2 [PATCH] NOMMU: Ma... |
597 |
|
8feae1311 NOMMU: Make VMAs ... |
598 599 600 |
validate_nommu_regions(); rb_erase(®ion->vm_rb, &nommu_region_tree); validate_nommu_regions(); |
57c8f63e8 nommu: stub expan... |
601 |
} |
930e652a2 [PATCH] NOMMU: Ma... |
602 |
/* |
8feae1311 NOMMU: Make VMAs ... |
603 |
* free a contiguous series of pages |
6fa5f80bc [PATCH] NOMMU: Ma... |
604 |
*/ |
8feae1311 NOMMU: Make VMAs ... |
605 |
static void free_page_series(unsigned long from, unsigned long to) |
6fa5f80bc [PATCH] NOMMU: Ma... |
606 |
{ |
8feae1311 NOMMU: Make VMAs ... |
607 608 609 610 |
for (; from < to; from += PAGE_SIZE) { struct page *page = virt_to_page(from); kdebug("- free %lx", from); |
33e5d7697 nommu: fix a numb... |
611 |
atomic_long_dec(&mmap_pages_allocated); |
8feae1311 NOMMU: Make VMAs ... |
612 |
if (page_count(page) != 1) |
33e5d7697 nommu: fix a numb... |
613 614 |
kdebug("free page %p: refcount not one: %d", page, page_count(page)); |
8feae1311 NOMMU: Make VMAs ... |
615 |
put_page(page); |
6fa5f80bc [PATCH] NOMMU: Ma... |
616 |
} |
6fa5f80bc [PATCH] NOMMU: Ma... |
617 618 619 |
} /* |
8feae1311 NOMMU: Make VMAs ... |
620 |
* release a reference to a region |
33e5d7697 nommu: fix a numb... |
621 |
* - the caller must hold the region semaphore for writing, which this releases |
dd8632a12 NOMMU: Make mmap ... |
622 |
* - the region may not have been added to the tree yet, in which case vm_top |
8feae1311 NOMMU: Make VMAs ... |
623 |
* will equal vm_start |
3034097a5 [PATCH] NOMMU: Or... |
624 |
*/ |
8feae1311 NOMMU: Make VMAs ... |
625 626 |
static void __put_nommu_region(struct vm_region *region) __releases(nommu_region_sem) |
1da177e4c Linux-2.6.12-rc2 |
627 |
{ |
1e2ae599d nommu: struct vm_... |
628 |
kenter("%p{%d}", region, region->vm_usage); |
1da177e4c Linux-2.6.12-rc2 |
629 |
|
8feae1311 NOMMU: Make VMAs ... |
630 |
BUG_ON(!nommu_region_tree.rb_node); |
1da177e4c Linux-2.6.12-rc2 |
631 |
|
1e2ae599d nommu: struct vm_... |
632 |
if (--region->vm_usage == 0) { |
dd8632a12 NOMMU: Make mmap ... |
633 |
if (region->vm_top > region->vm_start) |
8feae1311 NOMMU: Make VMAs ... |
634 635 636 637 638 639 640 641 642 643 |
delete_nommu_region(region); up_write(&nommu_region_sem); if (region->vm_file) fput(region->vm_file); /* IO memory and memory shared directly out of the pagecache * from ramfs/tmpfs mustn't be released here */ if (region->vm_flags & VM_MAPPED_COPY) { kdebug("free series"); |
dd8632a12 NOMMU: Make mmap ... |
644 |
free_page_series(region->vm_start, region->vm_top); |
8feae1311 NOMMU: Make VMAs ... |
645 646 647 648 |
} kmem_cache_free(vm_region_jar, region); } else { up_write(&nommu_region_sem); |
1da177e4c Linux-2.6.12-rc2 |
649 |
} |
8feae1311 NOMMU: Make VMAs ... |
650 |
} |
1da177e4c Linux-2.6.12-rc2 |
651 |
|
8feae1311 NOMMU: Make VMAs ... |
652 653 654 655 656 657 658 |
/* * release a reference to a region */ static void put_nommu_region(struct vm_region *region) { down_write(&nommu_region_sem); __put_nommu_region(region); |
1da177e4c Linux-2.6.12-rc2 |
659 |
} |
3034097a5 [PATCH] NOMMU: Or... |
660 |
/* |
eb8cdec4a nommu: add suppor... |
661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 |
* update protection on a vma */ static void protect_vma(struct vm_area_struct *vma, unsigned long flags) { #ifdef CONFIG_MPU struct mm_struct *mm = vma->vm_mm; long start = vma->vm_start & PAGE_MASK; while (start < vma->vm_end) { protect_page(mm, start, flags); start += PAGE_SIZE; } update_protections(mm); #endif } /* |
8feae1311 NOMMU: Make VMAs ... |
677 678 679 680 |
* add a VMA into a process's mm_struct in the appropriate place in the list * and tree and add to the address space's page tree also if not an anonymous * page * - should be called with mm->mmap_sem held writelocked |
3034097a5 [PATCH] NOMMU: Or... |
681 |
*/ |
8feae1311 NOMMU: Make VMAs ... |
682 |
static void add_vma_to_mm(struct mm_struct *mm, struct vm_area_struct *vma) |
1da177e4c Linux-2.6.12-rc2 |
683 |
{ |
6038def0d mm: nommu: sort m... |
684 |
struct vm_area_struct *pvma, *prev; |
1da177e4c Linux-2.6.12-rc2 |
685 |
struct address_space *mapping; |
6038def0d mm: nommu: sort m... |
686 |
struct rb_node **p, *parent, *rb_prev; |
8feae1311 NOMMU: Make VMAs ... |
687 688 689 690 691 692 693 |
kenter(",%p", vma); BUG_ON(!vma->vm_region); mm->map_count++; vma->vm_mm = mm; |
1da177e4c Linux-2.6.12-rc2 |
694 |
|
eb8cdec4a nommu: add suppor... |
695 |
protect_vma(vma, vma->vm_flags); |
1da177e4c Linux-2.6.12-rc2 |
696 697 698 |
/* add the VMA to the mapping */ if (vma->vm_file) { mapping = vma->vm_file->f_mapping; |
918e556ec NOMMU: Lock i_mma... |
699 |
mutex_lock(&mapping->i_mmap_mutex); |
1da177e4c Linux-2.6.12-rc2 |
700 |
flush_dcache_mmap_lock(mapping); |
6b2dbba8b mm: replace vma p... |
701 |
vma_interval_tree_insert(vma, &mapping->i_mmap); |
1da177e4c Linux-2.6.12-rc2 |
702 |
flush_dcache_mmap_unlock(mapping); |
918e556ec NOMMU: Lock i_mma... |
703 |
mutex_unlock(&mapping->i_mmap_mutex); |
1da177e4c Linux-2.6.12-rc2 |
704 |
} |
8feae1311 NOMMU: Make VMAs ... |
705 |
/* add the VMA to the tree */ |
6038def0d mm: nommu: sort m... |
706 |
parent = rb_prev = NULL; |
8feae1311 NOMMU: Make VMAs ... |
707 |
p = &mm->mm_rb.rb_node; |
1da177e4c Linux-2.6.12-rc2 |
708 709 710 |
while (*p) { parent = *p; pvma = rb_entry(parent, struct vm_area_struct, vm_rb); |
8feae1311 NOMMU: Make VMAs ... |
711 712 713 |
/* sort by: start addr, end addr, VMA struct addr in that order * (the latter is necessary as we may get identical VMAs) */ if (vma->vm_start < pvma->vm_start) |
1da177e4c Linux-2.6.12-rc2 |
714 |
p = &(*p)->rb_left; |
6038def0d mm: nommu: sort m... |
715 716 |
else if (vma->vm_start > pvma->vm_start) { rb_prev = parent; |
1da177e4c Linux-2.6.12-rc2 |
717 |
p = &(*p)->rb_right; |
6038def0d mm: nommu: sort m... |
718 |
} else if (vma->vm_end < pvma->vm_end) |
8feae1311 NOMMU: Make VMAs ... |
719 |
p = &(*p)->rb_left; |
6038def0d mm: nommu: sort m... |
720 721 |
else if (vma->vm_end > pvma->vm_end) { rb_prev = parent; |
8feae1311 NOMMU: Make VMAs ... |
722 |
p = &(*p)->rb_right; |
6038def0d mm: nommu: sort m... |
723 |
} else if (vma < pvma) |
8feae1311 NOMMU: Make VMAs ... |
724 |
p = &(*p)->rb_left; |
6038def0d mm: nommu: sort m... |
725 726 |
else if (vma > pvma) { rb_prev = parent; |
8feae1311 NOMMU: Make VMAs ... |
727 |
p = &(*p)->rb_right; |
6038def0d mm: nommu: sort m... |
728 |
} else |
8feae1311 NOMMU: Make VMAs ... |
729 |
BUG(); |
1da177e4c Linux-2.6.12-rc2 |
730 731 732 |
} rb_link_node(&vma->vm_rb, parent, p); |
8feae1311 NOMMU: Make VMAs ... |
733 734 735 |
rb_insert_color(&vma->vm_rb, &mm->mm_rb); /* add VMA to the VMA list also */ |
6038def0d mm: nommu: sort m... |
736 737 738 |
prev = NULL; if (rb_prev) prev = rb_entry(rb_prev, struct vm_area_struct, vm_rb); |
8feae1311 NOMMU: Make VMAs ... |
739 |
|
6038def0d mm: nommu: sort m... |
740 |
__vma_link_list(mm, vma, prev, parent); |
1da177e4c Linux-2.6.12-rc2 |
741 |
} |
3034097a5 [PATCH] NOMMU: Or... |
742 |
/* |
8feae1311 NOMMU: Make VMAs ... |
743 |
* delete a VMA from its owning mm_struct and address space |
3034097a5 [PATCH] NOMMU: Or... |
744 |
*/ |
8feae1311 NOMMU: Make VMAs ... |
745 |
static void delete_vma_from_mm(struct vm_area_struct *vma) |
1da177e4c Linux-2.6.12-rc2 |
746 747 |
{ struct address_space *mapping; |
8feae1311 NOMMU: Make VMAs ... |
748 749 750 |
struct mm_struct *mm = vma->vm_mm; kenter("%p", vma); |
eb8cdec4a nommu: add suppor... |
751 |
protect_vma(vma, 0); |
8feae1311 NOMMU: Make VMAs ... |
752 753 754 |
mm->map_count--; if (mm->mmap_cache == vma) mm->mmap_cache = NULL; |
1da177e4c Linux-2.6.12-rc2 |
755 756 757 758 |
/* remove the VMA from the mapping */ if (vma->vm_file) { mapping = vma->vm_file->f_mapping; |
918e556ec NOMMU: Lock i_mma... |
759 |
mutex_lock(&mapping->i_mmap_mutex); |
1da177e4c Linux-2.6.12-rc2 |
760 |
flush_dcache_mmap_lock(mapping); |
6b2dbba8b mm: replace vma p... |
761 |
vma_interval_tree_remove(vma, &mapping->i_mmap); |
1da177e4c Linux-2.6.12-rc2 |
762 |
flush_dcache_mmap_unlock(mapping); |
918e556ec NOMMU: Lock i_mma... |
763 |
mutex_unlock(&mapping->i_mmap_mutex); |
1da177e4c Linux-2.6.12-rc2 |
764 |
} |
8feae1311 NOMMU: Make VMAs ... |
765 766 |
/* remove from the MM's tree and list */ rb_erase(&vma->vm_rb, &mm->mm_rb); |
b951bf2c4 mm: nommu: don't ... |
767 768 769 770 771 772 773 774 |
if (vma->vm_prev) vma->vm_prev->vm_next = vma->vm_next; else mm->mmap = vma->vm_next; if (vma->vm_next) vma->vm_next->vm_prev = vma->vm_prev; |
8feae1311 NOMMU: Make VMAs ... |
775 776 777 778 779 780 781 782 783 784 |
} /* * destroy a VMA record */ static void delete_vma(struct mm_struct *mm, struct vm_area_struct *vma) { kenter("%p", vma); if (vma->vm_ops && vma->vm_ops->close) vma->vm_ops->close(vma); |
e9714acf8 mm: kill vma flag... |
785 |
if (vma->vm_file) |
8feae1311 NOMMU: Make VMAs ... |
786 |
fput(vma->vm_file); |
8feae1311 NOMMU: Make VMAs ... |
787 788 789 790 791 792 793 794 795 796 797 |
put_nommu_region(vma->vm_region); kmem_cache_free(vm_area_cachep, vma); } /* * look up the first VMA in which addr resides, NULL if none * - should be called with mm->mmap_sem at least held readlocked */ struct vm_area_struct *find_vma(struct mm_struct *mm, unsigned long addr) { struct vm_area_struct *vma; |
8feae1311 NOMMU: Make VMAs ... |
798 799 |
/* check the cache first */ |
b6a9b7f6b mm: prevent mmap_... |
800 |
vma = ACCESS_ONCE(mm->mmap_cache); |
8feae1311 NOMMU: Make VMAs ... |
801 802 |
if (vma && vma->vm_start <= addr && vma->vm_end > addr) return vma; |
e922c4c53 mm: nommu: find v... |
803 |
/* trawl the list (there may be multiple mappings in which addr |
8feae1311 NOMMU: Make VMAs ... |
804 |
* resides) */ |
e922c4c53 mm: nommu: find v... |
805 |
for (vma = mm->mmap; vma; vma = vma->vm_next) { |
8feae1311 NOMMU: Make VMAs ... |
806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 |
if (vma->vm_start > addr) return NULL; if (vma->vm_end > addr) { mm->mmap_cache = vma; return vma; } } return NULL; } EXPORT_SYMBOL(find_vma); /* * find a VMA * - we don't extend stack VMAs under NOMMU conditions */ struct vm_area_struct *find_extend_vma(struct mm_struct *mm, unsigned long addr) { |
7561e8ca0 NOMMU: Revert 'no... |
824 |
return find_vma(mm, addr); |
8feae1311 NOMMU: Make VMAs ... |
825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 |
} /* * expand a stack to a given address * - not supported under NOMMU conditions */ int expand_stack(struct vm_area_struct *vma, unsigned long address) { return -ENOMEM; } /* * look up the first VMA exactly that exactly matches addr * - should be called with mm->mmap_sem at least held readlocked */ static struct vm_area_struct *find_vma_exact(struct mm_struct *mm, unsigned long addr, unsigned long len) { struct vm_area_struct *vma; |
8feae1311 NOMMU: Make VMAs ... |
845 846 847 848 849 850 |
unsigned long end = addr + len; /* check the cache first */ vma = mm->mmap_cache; if (vma && vma->vm_start == addr && vma->vm_end == end) return vma; |
e922c4c53 mm: nommu: find v... |
851 |
/* trawl the list (there may be multiple mappings in which addr |
8feae1311 NOMMU: Make VMAs ... |
852 |
* resides) */ |
e922c4c53 mm: nommu: find v... |
853 |
for (vma = mm->mmap; vma; vma = vma->vm_next) { |
8feae1311 NOMMU: Make VMAs ... |
854 855 856 857 858 859 860 861 862 863 864 |
if (vma->vm_start < addr) continue; if (vma->vm_start > addr) return NULL; if (vma->vm_end == end) { mm->mmap_cache = vma; return vma; } } return NULL; |
1da177e4c Linux-2.6.12-rc2 |
865 866 867 868 869 870 871 872 873 874 875 876 877 878 |
} /* * determine whether a mapping should be permitted and, if so, what sort of * mapping we're capable of supporting */ static int validate_mmap_request(struct file *file, unsigned long addr, unsigned long len, unsigned long prot, unsigned long flags, unsigned long pgoff, unsigned long *_capabilities) { |
8feae1311 NOMMU: Make VMAs ... |
879 |
unsigned long capabilities, rlen; |
1da177e4c Linux-2.6.12-rc2 |
880 881 882 |
int ret; /* do the simple checks first */ |
06aab5a30 NOMMU: Ignore mma... |
883 |
if (flags & MAP_FIXED) { |
1da177e4c Linux-2.6.12-rc2 |
884 885 886 887 888 889 890 891 892 893 |
printk(KERN_DEBUG "%d: Can't do fixed-address/overlay mmap of RAM ", current->pid); return -EINVAL; } if ((flags & MAP_TYPE) != MAP_PRIVATE && (flags & MAP_TYPE) != MAP_SHARED) return -EINVAL; |
f81cff0d4 [PATCH] uclinux: ... |
894 |
if (!len) |
1da177e4c Linux-2.6.12-rc2 |
895 |
return -EINVAL; |
f81cff0d4 [PATCH] uclinux: ... |
896 |
/* Careful about overflows.. */ |
8feae1311 NOMMU: Make VMAs ... |
897 898 |
rlen = PAGE_ALIGN(len); if (!rlen || rlen > TASK_SIZE) |
f81cff0d4 [PATCH] uclinux: ... |
899 |
return -ENOMEM; |
1da177e4c Linux-2.6.12-rc2 |
900 |
/* offset overflow? */ |
8feae1311 NOMMU: Make VMAs ... |
901 |
if ((pgoff + (rlen >> PAGE_SHIFT)) < pgoff) |
f81cff0d4 [PATCH] uclinux: ... |
902 |
return -EOVERFLOW; |
1da177e4c Linux-2.6.12-rc2 |
903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 |
if (file) { /* validate file mapping requests */ struct address_space *mapping; /* files must support mmap */ if (!file->f_op || !file->f_op->mmap) return -ENODEV; /* work out if what we've got could possibly be shared * - we support chardevs that provide their own "memory" * - we support files/blockdevs that are memory backed */ mapping = file->f_mapping; if (!mapping) |
496ad9aa8 new helper: file_... |
918 |
mapping = file_inode(file)->i_mapping; |
1da177e4c Linux-2.6.12-rc2 |
919 920 921 922 923 924 925 926 |
capabilities = 0; if (mapping && mapping->backing_dev_info) capabilities = mapping->backing_dev_info->capabilities; if (!capabilities) { /* no explicit capabilities set, so assume some * defaults */ |
496ad9aa8 new helper: file_... |
927 |
switch (file_inode(file)->i_mode & S_IFMT) { |
1da177e4c Linux-2.6.12-rc2 |
928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 |
case S_IFREG: case S_IFBLK: capabilities = BDI_CAP_MAP_COPY; break; case S_IFCHR: capabilities = BDI_CAP_MAP_DIRECT | BDI_CAP_READ_MAP | BDI_CAP_WRITE_MAP; break; default: return -EINVAL; } } /* eliminate any capabilities that we can't support on this * device */ if (!file->f_op->get_unmapped_area) capabilities &= ~BDI_CAP_MAP_DIRECT; if (!file->f_op->read) capabilities &= ~BDI_CAP_MAP_COPY; |
28d7a6ae9 nommu: check fd r... |
951 952 953 |
/* The file shall have been opened with read permission. */ if (!(file->f_mode & FMODE_READ)) return -EACCES; |
1da177e4c Linux-2.6.12-rc2 |
954 955 956 957 958 |
if (flags & MAP_SHARED) { /* do checks for writing, appending and locking */ if ((prot & PROT_WRITE) && !(file->f_mode & FMODE_WRITE)) return -EACCES; |
496ad9aa8 new helper: file_... |
959 |
if (IS_APPEND(file_inode(file)) && |
1da177e4c Linux-2.6.12-rc2 |
960 961 |
(file->f_mode & FMODE_WRITE)) return -EACCES; |
496ad9aa8 new helper: file_... |
962 |
if (locks_verify_locked(file_inode(file))) |
1da177e4c Linux-2.6.12-rc2 |
963 964 965 966 |
return -EAGAIN; if (!(capabilities & BDI_CAP_MAP_DIRECT)) return -ENODEV; |
1da177e4c Linux-2.6.12-rc2 |
967 968 969 970 971 972 973 974 975 976 977 978 979 980 |
/* we mustn't privatise shared mappings */ capabilities &= ~BDI_CAP_MAP_COPY; } else { /* we're going to read the file into private memory we * allocate */ if (!(capabilities & BDI_CAP_MAP_COPY)) return -ENODEV; /* we don't permit a private writable mapping to be * shared with the backing device */ if (prot & PROT_WRITE) capabilities &= ~BDI_CAP_MAP_DIRECT; } |
3c7b20454 nommu: allow priv... |
981 982 983 984 985 986 987 988 989 990 991 992 993 994 |
if (capabilities & BDI_CAP_MAP_DIRECT) { if (((prot & PROT_READ) && !(capabilities & BDI_CAP_READ_MAP)) || ((prot & PROT_WRITE) && !(capabilities & BDI_CAP_WRITE_MAP)) || ((prot & PROT_EXEC) && !(capabilities & BDI_CAP_EXEC_MAP)) ) { capabilities &= ~BDI_CAP_MAP_DIRECT; if (flags & MAP_SHARED) { printk(KERN_WARNING "MAP_SHARED not completely supported on !MMU "); return -EINVAL; } } } |
1da177e4c Linux-2.6.12-rc2 |
995 996 |
/* handle executable mappings and implied executable * mappings */ |
e9536ae72 [PATCH] struct pa... |
997 |
if (file->f_path.mnt->mnt_flags & MNT_NOEXEC) { |
1da177e4c Linux-2.6.12-rc2 |
998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 |
if (prot & PROT_EXEC) return -EPERM; } else if ((prot & PROT_READ) && !(prot & PROT_EXEC)) { /* handle implication of PROT_EXEC by PROT_READ */ if (current->personality & READ_IMPLIES_EXEC) { if (capabilities & BDI_CAP_EXEC_MAP) prot |= PROT_EXEC; } } else if ((prot & PROT_READ) && (prot & PROT_EXEC) && !(capabilities & BDI_CAP_EXEC_MAP) ) { /* backing file is not executable, try to copy */ capabilities &= ~BDI_CAP_MAP_DIRECT; } } else { /* anonymous mappings are always memory backed and can be * privately mapped */ capabilities = BDI_CAP_MAP_COPY; /* handle PROT_EXEC implication by PROT_READ */ if ((prot & PROT_READ) && (current->personality & READ_IMPLIES_EXEC)) prot |= PROT_EXEC; } /* allow the security API to have its say */ |
e5467859f split ->file_mmap... |
1029 1030 1031 |
ret = security_mmap_addr(addr); if (ret < 0) return ret; |
1da177e4c Linux-2.6.12-rc2 |
1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 |
/* looks okay */ *_capabilities = capabilities; return 0; } /* * we've determined that we can make the mapping, now translate what we * now know into VMA flags */ static unsigned long determine_vm_flags(struct file *file, unsigned long prot, unsigned long flags, unsigned long capabilities) { unsigned long vm_flags; vm_flags = calc_vm_prot_bits(prot) | calc_vm_flag_bits(flags); |
1da177e4c Linux-2.6.12-rc2 |
1050 1051 1052 1053 |
/* vm_flags |= mm->def_flags; */ if (!(capabilities & BDI_CAP_MAP_DIRECT)) { /* attempt to share read-only copies of mapped file chunks */ |
3c7b20454 nommu: allow priv... |
1054 |
vm_flags |= VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC; |
1da177e4c Linux-2.6.12-rc2 |
1055 1056 |
if (file && !(prot & PROT_WRITE)) vm_flags |= VM_MAYSHARE; |
3c7b20454 nommu: allow priv... |
1057 |
} else { |
1da177e4c Linux-2.6.12-rc2 |
1058 1059 1060 |
/* overlay a shareable mapping on the backing device or inode * if possible - used for chardevs, ramfs/tmpfs/shmfs and * romfs/cramfs */ |
3c7b20454 nommu: allow priv... |
1061 |
vm_flags |= VM_MAYSHARE | (capabilities & BDI_CAP_VMFLAGS); |
1da177e4c Linux-2.6.12-rc2 |
1062 |
if (flags & MAP_SHARED) |
3c7b20454 nommu: allow priv... |
1063 |
vm_flags |= VM_SHARED; |
1da177e4c Linux-2.6.12-rc2 |
1064 1065 1066 1067 1068 1069 |
} /* refuse to let anyone share private mappings with this process if * it's being traced - otherwise breakpoints set in it may interfere * with another untraced process */ |
a288eecce ptrace: kill triv... |
1070 |
if ((flags & MAP_PRIVATE) && current->ptrace) |
1da177e4c Linux-2.6.12-rc2 |
1071 1072 1073 1074 1075 1076 |
vm_flags &= ~VM_MAYSHARE; return vm_flags; } /* |
8feae1311 NOMMU: Make VMAs ... |
1077 1078 |
* set up a shared mapping on a file (the driver or filesystem provides and * pins the storage) |
1da177e4c Linux-2.6.12-rc2 |
1079 |
*/ |
8feae1311 NOMMU: Make VMAs ... |
1080 |
static int do_mmap_shared_file(struct vm_area_struct *vma) |
1da177e4c Linux-2.6.12-rc2 |
1081 1082 1083 1084 |
{ int ret; ret = vma->vm_file->f_op->mmap(vma->vm_file, vma); |
dd8632a12 NOMMU: Make mmap ... |
1085 1086 |
if (ret == 0) { vma->vm_region->vm_top = vma->vm_region->vm_end; |
645d83c5d NOMMU: Fix MAP_PR... |
1087 |
return 0; |
dd8632a12 NOMMU: Make mmap ... |
1088 |
} |
1da177e4c Linux-2.6.12-rc2 |
1089 1090 |
if (ret != -ENOSYS) return ret; |
3fa30460e nommu: fix an inc... |
1091 1092 1093 |
/* getting -ENOSYS indicates that direct mmap isn't possible (as * opposed to tried but failed) so we can only give a suitable error as * it's not possible to make a private copy if MAP_SHARED was given */ |
1da177e4c Linux-2.6.12-rc2 |
1094 1095 1096 1097 1098 1099 |
return -ENODEV; } /* * set up a private mapping or an anonymous shared mapping */ |
8feae1311 NOMMU: Make VMAs ... |
1100 1101 |
static int do_mmap_private(struct vm_area_struct *vma, struct vm_region *region, |
645d83c5d NOMMU: Fix MAP_PR... |
1102 1103 |
unsigned long len, unsigned long capabilities) |
1da177e4c Linux-2.6.12-rc2 |
1104 |
{ |
8feae1311 NOMMU: Make VMAs ... |
1105 |
struct page *pages; |
f67d9b157 nommu: add page a... |
1106 |
unsigned long total, point, n; |
1da177e4c Linux-2.6.12-rc2 |
1107 |
void *base; |
8feae1311 NOMMU: Make VMAs ... |
1108 |
int ret, order; |
1da177e4c Linux-2.6.12-rc2 |
1109 1110 1111 1112 1113 |
/* invoke the file's mapping function so that it can keep track of * shared mappings on devices or memory * - VM_MAYSHARE will be set if it may attempt to share */ |
645d83c5d NOMMU: Fix MAP_PR... |
1114 |
if (capabilities & BDI_CAP_MAP_DIRECT) { |
1da177e4c Linux-2.6.12-rc2 |
1115 |
ret = vma->vm_file->f_op->mmap(vma->vm_file, vma); |
dd8632a12 NOMMU: Make mmap ... |
1116 |
if (ret == 0) { |
1da177e4c Linux-2.6.12-rc2 |
1117 |
/* shouldn't return success if we're not sharing */ |
dd8632a12 NOMMU: Make mmap ... |
1118 1119 |
BUG_ON(!(vma->vm_flags & VM_MAYSHARE)); vma->vm_region->vm_top = vma->vm_region->vm_end; |
645d83c5d NOMMU: Fix MAP_PR... |
1120 |
return 0; |
1da177e4c Linux-2.6.12-rc2 |
1121 |
} |
dd8632a12 NOMMU: Make mmap ... |
1122 1123 |
if (ret != -ENOSYS) return ret; |
1da177e4c Linux-2.6.12-rc2 |
1124 1125 1126 1127 1128 |
/* getting an ENOSYS error indicates that direct mmap isn't * possible (as opposed to tried but failed) so we'll try to * make a private copy of the data and map that instead */ } |
8feae1311 NOMMU: Make VMAs ... |
1129 |
|
1da177e4c Linux-2.6.12-rc2 |
1130 1131 1132 1133 |
/* allocate some memory to hold the mapping * - note that this may not return a page-aligned address if the object * we're allocating is smaller than a page */ |
f67d9b157 nommu: add page a... |
1134 |
order = get_order(len); |
8feae1311 NOMMU: Make VMAs ... |
1135 1136 1137 1138 |
kdebug("alloc order %d for %lx", order, len); pages = alloc_pages(GFP_KERNEL, order); if (!pages) |
1da177e4c Linux-2.6.12-rc2 |
1139 |
goto enomem; |
8feae1311 NOMMU: Make VMAs ... |
1140 |
total = 1 << order; |
33e5d7697 nommu: fix a numb... |
1141 |
atomic_long_add(total, &mmap_pages_allocated); |
8feae1311 NOMMU: Make VMAs ... |
1142 |
|
f67d9b157 nommu: add page a... |
1143 |
point = len >> PAGE_SHIFT; |
dd8632a12 NOMMU: Make mmap ... |
1144 1145 1146 1147 1148 1149 1150 1151 |
/* we allocated a power-of-2 sized page set, so we may want to trim off * the excess */ if (sysctl_nr_trim_pages && total - point >= sysctl_nr_trim_pages) { while (total > point) { order = ilog2(total - point); n = 1 << order; kdebug("shave %lu/%lu @%lu", n, total - point, total); |
33e5d7697 nommu: fix a numb... |
1152 |
atomic_long_sub(n, &mmap_pages_allocated); |
dd8632a12 NOMMU: Make mmap ... |
1153 1154 1155 1156 |
total -= n; set_page_refcounted(pages + total); __free_pages(pages + total, order); } |
8feae1311 NOMMU: Make VMAs ... |
1157 |
} |
8feae1311 NOMMU: Make VMAs ... |
1158 1159 |
for (point = 1; point < total; point++) set_page_refcounted(&pages[point]); |
1da177e4c Linux-2.6.12-rc2 |
1160 |
|
8feae1311 NOMMU: Make VMAs ... |
1161 1162 1163 |
base = page_address(pages); region->vm_flags = vma->vm_flags |= VM_MAPPED_COPY; region->vm_start = (unsigned long) base; |
f67d9b157 nommu: add page a... |
1164 |
region->vm_end = region->vm_start + len; |
dd8632a12 NOMMU: Make mmap ... |
1165 |
region->vm_top = region->vm_start + (total << PAGE_SHIFT); |
8feae1311 NOMMU: Make VMAs ... |
1166 1167 1168 |
vma->vm_start = region->vm_start; vma->vm_end = region->vm_start + len; |
1da177e4c Linux-2.6.12-rc2 |
1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 |
if (vma->vm_file) { /* read the contents of a file into the copy */ mm_segment_t old_fs; loff_t fpos; fpos = vma->vm_pgoff; fpos <<= PAGE_SHIFT; old_fs = get_fs(); set_fs(KERNEL_DS); |
f67d9b157 nommu: add page a... |
1180 |
ret = vma->vm_file->f_op->read(vma->vm_file, base, len, &fpos); |
1da177e4c Linux-2.6.12-rc2 |
1181 1182 1183 1184 1185 1186 |
set_fs(old_fs); if (ret < 0) goto error_free; /* clear the last little bit */ |
f67d9b157 nommu: add page a... |
1187 1188 |
if (ret < len) memset(base + ret, 0, len - ret); |
1da177e4c Linux-2.6.12-rc2 |
1189 |
|
1da177e4c Linux-2.6.12-rc2 |
1190 1191 1192 1193 1194 |
} return 0; error_free: |
7223bb4a8 mm: nommu: fix a ... |
1195 |
free_page_series(region->vm_start, region->vm_top); |
8feae1311 NOMMU: Make VMAs ... |
1196 1197 |
region->vm_start = vma->vm_start = 0; region->vm_end = vma->vm_end = 0; |
dd8632a12 NOMMU: Make mmap ... |
1198 |
region->vm_top = 0; |
1da177e4c Linux-2.6.12-rc2 |
1199 1200 1201 |
return ret; enomem: |
05ae6fa31 uclinux: add proc... |
1202 1203 1204 |
printk("Allocation of length %lu from process %d (%s) failed ", len, current->pid, current->comm); |
7bf02ea22 arch, mm: filter ... |
1205 |
show_free_areas(0); |
1da177e4c Linux-2.6.12-rc2 |
1206 1207 1208 1209 1210 1211 |
return -ENOMEM; } /* * handle mapping creation for uClinux */ |
e3fc629d7 switch aio and sh... |
1212 |
unsigned long do_mmap_pgoff(struct file *file, |
1da177e4c Linux-2.6.12-rc2 |
1213 1214 1215 1216 |
unsigned long addr, unsigned long len, unsigned long prot, unsigned long flags, |
bebeb3d68 mm: introduce mm_... |
1217 |
unsigned long pgoff, |
41badc15c mm: make do_mmap_... |
1218 |
unsigned long *populate) |
1da177e4c Linux-2.6.12-rc2 |
1219 |
{ |
8feae1311 NOMMU: Make VMAs ... |
1220 1221 |
struct vm_area_struct *vma; struct vm_region *region; |
1da177e4c Linux-2.6.12-rc2 |
1222 |
struct rb_node *rb; |
8feae1311 NOMMU: Make VMAs ... |
1223 |
unsigned long capabilities, vm_flags, result; |
1da177e4c Linux-2.6.12-rc2 |
1224 |
int ret; |
8feae1311 NOMMU: Make VMAs ... |
1225 |
kenter(",%lx,%lx,%lx,%lx,%lx", addr, len, prot, flags, pgoff); |
41badc15c mm: make do_mmap_... |
1226 |
*populate = 0; |
bebeb3d68 mm: introduce mm_... |
1227 |
|
1da177e4c Linux-2.6.12-rc2 |
1228 1229 1230 1231 |
/* decide whether we should attempt the mapping, and if so what sort of * mapping */ ret = validate_mmap_request(file, addr, len, prot, flags, pgoff, &capabilities); |
8feae1311 NOMMU: Make VMAs ... |
1232 1233 |
if (ret < 0) { kleave(" = %d [val]", ret); |
1da177e4c Linux-2.6.12-rc2 |
1234 |
return ret; |
8feae1311 NOMMU: Make VMAs ... |
1235 |
} |
1da177e4c Linux-2.6.12-rc2 |
1236 |
|
06aab5a30 NOMMU: Ignore mma... |
1237 1238 |
/* we ignore the address hint */ addr = 0; |
f67d9b157 nommu: add page a... |
1239 |
len = PAGE_ALIGN(len); |
06aab5a30 NOMMU: Ignore mma... |
1240 |
|
1da177e4c Linux-2.6.12-rc2 |
1241 1242 1243 |
/* we've determined that we can make the mapping, now translate what we * now know into VMA flags */ vm_flags = determine_vm_flags(file, prot, flags, capabilities); |
8feae1311 NOMMU: Make VMAs ... |
1244 1245 1246 1247 1248 1249 1250 1251 |
/* we're going to need to record the mapping */ region = kmem_cache_zalloc(vm_region_jar, GFP_KERNEL); if (!region) goto error_getting_region; vma = kmem_cache_zalloc(vm_area_cachep, GFP_KERNEL); if (!vma) goto error_getting_vma; |
1da177e4c Linux-2.6.12-rc2 |
1252 |
|
1e2ae599d nommu: struct vm_... |
1253 |
region->vm_usage = 1; |
8feae1311 NOMMU: Make VMAs ... |
1254 1255 |
region->vm_flags = vm_flags; region->vm_pgoff = pgoff; |
5beb49305 mm: change anon_v... |
1256 |
INIT_LIST_HEAD(&vma->anon_vma_chain); |
8feae1311 NOMMU: Make VMAs ... |
1257 1258 |
vma->vm_flags = vm_flags; vma->vm_pgoff = pgoff; |
1da177e4c Linux-2.6.12-rc2 |
1259 |
|
8feae1311 NOMMU: Make VMAs ... |
1260 |
if (file) { |
cb0942b81 make get_file() r... |
1261 1262 |
region->vm_file = get_file(file); vma->vm_file = get_file(file); |
8feae1311 NOMMU: Make VMAs ... |
1263 1264 1265 1266 1267 |
} down_write(&nommu_region_sem); /* if we want to share, we need to check for regions created by other |
1da177e4c Linux-2.6.12-rc2 |
1268 |
* mmap() calls that overlap with our proposed mapping |
8feae1311 NOMMU: Make VMAs ... |
1269 |
* - we can only share with a superset match on most regular files |
1da177e4c Linux-2.6.12-rc2 |
1270 1271 1272 1273 1274 1275 |
* - shared mappings on character devices and memory backed files are * permitted to overlap inexactly as far as we are concerned for in * these cases, sharing is handled in the driver or filesystem rather * than here */ if (vm_flags & VM_MAYSHARE) { |
8feae1311 NOMMU: Make VMAs ... |
1276 1277 |
struct vm_region *pregion; unsigned long pglen, rpglen, pgend, rpgend, start; |
1da177e4c Linux-2.6.12-rc2 |
1278 |
|
8feae1311 NOMMU: Make VMAs ... |
1279 1280 |
pglen = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; pgend = pgoff + pglen; |
165b23927 [PATCH] NOMMU: ma... |
1281 |
|
8feae1311 NOMMU: Make VMAs ... |
1282 1283 |
for (rb = rb_first(&nommu_region_tree); rb; rb = rb_next(rb)) { pregion = rb_entry(rb, struct vm_region, vm_rb); |
1da177e4c Linux-2.6.12-rc2 |
1284 |
|
8feae1311 NOMMU: Make VMAs ... |
1285 |
if (!(pregion->vm_flags & VM_MAYSHARE)) |
1da177e4c Linux-2.6.12-rc2 |
1286 1287 1288 |
continue; /* search for overlapping mappings on the same file */ |
496ad9aa8 new helper: file_... |
1289 1290 |
if (file_inode(pregion->vm_file) != file_inode(file)) |
1da177e4c Linux-2.6.12-rc2 |
1291 |
continue; |
8feae1311 NOMMU: Make VMAs ... |
1292 |
if (pregion->vm_pgoff >= pgend) |
1da177e4c Linux-2.6.12-rc2 |
1293 |
continue; |
8feae1311 NOMMU: Make VMAs ... |
1294 1295 1296 1297 |
rpglen = pregion->vm_end - pregion->vm_start; rpglen = (rpglen + PAGE_SIZE - 1) >> PAGE_SHIFT; rpgend = pregion->vm_pgoff + rpglen; if (pgoff >= rpgend) |
1da177e4c Linux-2.6.12-rc2 |
1298 |
continue; |
8feae1311 NOMMU: Make VMAs ... |
1299 1300 1301 1302 1303 |
/* handle inexactly overlapping matches between * mappings */ if ((pregion->vm_pgoff != pgoff || rpglen != pglen) && !(pgoff >= pregion->vm_pgoff && pgend <= rpgend)) { /* new mapping is not a subset of the region */ |
1da177e4c Linux-2.6.12-rc2 |
1304 1305 1306 1307 |
if (!(capabilities & BDI_CAP_MAP_DIRECT)) goto sharing_violation; continue; } |
8feae1311 NOMMU: Make VMAs ... |
1308 |
/* we've found a region we can share */ |
1e2ae599d nommu: struct vm_... |
1309 |
pregion->vm_usage++; |
8feae1311 NOMMU: Make VMAs ... |
1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 |
vma->vm_region = pregion; start = pregion->vm_start; start += (pgoff - pregion->vm_pgoff) << PAGE_SHIFT; vma->vm_start = start; vma->vm_end = start + len; if (pregion->vm_flags & VM_MAPPED_COPY) { kdebug("share copy"); vma->vm_flags |= VM_MAPPED_COPY; } else { kdebug("share mmap"); ret = do_mmap_shared_file(vma); if (ret < 0) { vma->vm_region = NULL; vma->vm_start = 0; vma->vm_end = 0; |
1e2ae599d nommu: struct vm_... |
1326 |
pregion->vm_usage--; |
8feae1311 NOMMU: Make VMAs ... |
1327 1328 1329 1330 1331 1332 1333 1334 1335 |
pregion = NULL; goto error_just_free; } } fput(region->vm_file); kmem_cache_free(vm_region_jar, region); region = pregion; result = start; goto share; |
1da177e4c Linux-2.6.12-rc2 |
1336 |
} |
1da177e4c Linux-2.6.12-rc2 |
1337 1338 1339 1340 |
/* obtain the address at which to make a shared mapping * - this is the hook for quasi-memory character devices to * tell us the location of a shared mapping */ |
645d83c5d NOMMU: Fix MAP_PR... |
1341 |
if (capabilities & BDI_CAP_MAP_DIRECT) { |
1da177e4c Linux-2.6.12-rc2 |
1342 1343 |
addr = file->f_op->get_unmapped_area(file, addr, len, pgoff, flags); |
bb005a59e mm: nommu: fix a ... |
1344 |
if (IS_ERR_VALUE(addr)) { |
1da177e4c Linux-2.6.12-rc2 |
1345 |
ret = addr; |
bb005a59e mm: nommu: fix a ... |
1346 |
if (ret != -ENOSYS) |
8feae1311 NOMMU: Make VMAs ... |
1347 |
goto error_just_free; |
1da177e4c Linux-2.6.12-rc2 |
1348 1349 1350 1351 |
/* the driver refused to tell us where to site * the mapping so we'll have to attempt to copy * it */ |
bb005a59e mm: nommu: fix a ... |
1352 |
ret = -ENODEV; |
1da177e4c Linux-2.6.12-rc2 |
1353 |
if (!(capabilities & BDI_CAP_MAP_COPY)) |
8feae1311 NOMMU: Make VMAs ... |
1354 |
goto error_just_free; |
1da177e4c Linux-2.6.12-rc2 |
1355 1356 |
capabilities &= ~BDI_CAP_MAP_DIRECT; |
8feae1311 NOMMU: Make VMAs ... |
1357 1358 1359 |
} else { vma->vm_start = region->vm_start = addr; vma->vm_end = region->vm_end = addr + len; |
1da177e4c Linux-2.6.12-rc2 |
1360 1361 1362 |
} } } |
8feae1311 NOMMU: Make VMAs ... |
1363 |
vma->vm_region = region; |
1da177e4c Linux-2.6.12-rc2 |
1364 |
|
645d83c5d NOMMU: Fix MAP_PR... |
1365 1366 1367 |
/* set up the mapping * - the region is filled in if BDI_CAP_MAP_DIRECT is still set */ |
1da177e4c Linux-2.6.12-rc2 |
1368 |
if (file && vma->vm_flags & VM_SHARED) |
8feae1311 NOMMU: Make VMAs ... |
1369 |
ret = do_mmap_shared_file(vma); |
1da177e4c Linux-2.6.12-rc2 |
1370 |
else |
645d83c5d NOMMU: Fix MAP_PR... |
1371 |
ret = do_mmap_private(vma, region, len, capabilities); |
1da177e4c Linux-2.6.12-rc2 |
1372 |
if (ret < 0) |
645d83c5d NOMMU: Fix MAP_PR... |
1373 1374 |
goto error_just_free; add_nommu_region(region); |
8feae1311 NOMMU: Make VMAs ... |
1375 |
|
ea6376395 nommu: fix malloc... |
1376 1377 1378 1379 |
/* clear anonymous mappings that don't ask for uninitialized data */ if (!vma->vm_file && !(flags & MAP_UNINITIALIZED)) memset((void *)region->vm_start, 0, region->vm_end - region->vm_start); |
1da177e4c Linux-2.6.12-rc2 |
1380 |
/* okay... we have a mapping; now we have to register it */ |
8feae1311 NOMMU: Make VMAs ... |
1381 |
result = vma->vm_start; |
1da177e4c Linux-2.6.12-rc2 |
1382 |
|
1da177e4c Linux-2.6.12-rc2 |
1383 |
current->mm->total_vm += len >> PAGE_SHIFT; |
8feae1311 NOMMU: Make VMAs ... |
1384 1385 |
share: add_vma_to_mm(current->mm, vma); |
1da177e4c Linux-2.6.12-rc2 |
1386 |
|
cfe79c00a NOMMU: Avoiding d... |
1387 1388 1389 1390 1391 1392 |
/* we flush the region from the icache only when the first executable * mapping of it is made */ if (vma->vm_flags & VM_EXEC && !region->vm_icache_flushed) { flush_icache_range(region->vm_start, region->vm_end); region->vm_icache_flushed = true; } |
1da177e4c Linux-2.6.12-rc2 |
1393 |
|
cfe79c00a NOMMU: Avoiding d... |
1394 |
up_write(&nommu_region_sem); |
1da177e4c Linux-2.6.12-rc2 |
1395 |
|
8feae1311 NOMMU: Make VMAs ... |
1396 1397 |
kleave(" = %lx", result); return result; |
1da177e4c Linux-2.6.12-rc2 |
1398 |
|
8feae1311 NOMMU: Make VMAs ... |
1399 1400 1401 |
error_just_free: up_write(&nommu_region_sem); error: |
89a864027 NOMMU: Don't pass... |
1402 1403 |
if (region->vm_file) fput(region->vm_file); |
8feae1311 NOMMU: Make VMAs ... |
1404 |
kmem_cache_free(vm_region_jar, region); |
89a864027 NOMMU: Don't pass... |
1405 1406 |
if (vma->vm_file) fput(vma->vm_file); |
8feae1311 NOMMU: Make VMAs ... |
1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 |
kmem_cache_free(vm_area_cachep, vma); kleave(" = %d", ret); return ret; sharing_violation: up_write(&nommu_region_sem); printk(KERN_WARNING "Attempt to share mismatched mappings "); ret = -EINVAL; goto error; |
1da177e4c Linux-2.6.12-rc2 |
1417 |
|
8feae1311 NOMMU: Make VMAs ... |
1418 1419 1420 1421 1422 |
error_getting_vma: kmem_cache_free(vm_region_jar, region); printk(KERN_WARNING "Allocation of vma for %lu byte allocation" " from process %d failed ", |
1da177e4c Linux-2.6.12-rc2 |
1423 |
len, current->pid); |
7bf02ea22 arch, mm: filter ... |
1424 |
show_free_areas(0); |
1da177e4c Linux-2.6.12-rc2 |
1425 |
return -ENOMEM; |
8feae1311 NOMMU: Make VMAs ... |
1426 1427 1428 1429 |
error_getting_region: printk(KERN_WARNING "Allocation of vm region for %lu byte allocation" " from process %d failed ", |
1da177e4c Linux-2.6.12-rc2 |
1430 |
len, current->pid); |
7bf02ea22 arch, mm: filter ... |
1431 |
show_free_areas(0); |
1da177e4c Linux-2.6.12-rc2 |
1432 1433 |
return -ENOMEM; } |
6be5ceb02 VM: add "vm_mmap(... |
1434 |
|
66f0dc481 mm: move sys_mmap... |
1435 1436 1437 1438 1439 1440 |
SYSCALL_DEFINE6(mmap_pgoff, unsigned long, addr, unsigned long, len, unsigned long, prot, unsigned long, flags, unsigned long, fd, unsigned long, pgoff) { struct file *file = NULL; unsigned long retval = -EBADF; |
120a795da audit mmap |
1441 |
audit_mmap_fd(fd, flags); |
66f0dc481 mm: move sys_mmap... |
1442 1443 1444 1445 1446 1447 1448 |
if (!(flags & MAP_ANONYMOUS)) { file = fget(fd); if (!file) goto out; } flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE); |
ad1ed2937 nommu: fix compil... |
1449 |
retval = vm_mmap_pgoff(file, addr, len, prot, flags, pgoff); |
66f0dc481 mm: move sys_mmap... |
1450 1451 1452 1453 1454 1455 |
if (file) fput(file); out: return retval; } |
a4679373c Add generic sys_o... |
1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 |
#ifdef __ARCH_WANT_SYS_OLD_MMAP struct mmap_arg_struct { unsigned long addr; unsigned long len; unsigned long prot; unsigned long flags; unsigned long fd; unsigned long offset; }; SYSCALL_DEFINE1(old_mmap, struct mmap_arg_struct __user *, arg) { struct mmap_arg_struct a; if (copy_from_user(&a, arg, sizeof(a))) return -EFAULT; if (a.offset & ~PAGE_MASK) return -EINVAL; return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT); } #endif /* __ARCH_WANT_SYS_OLD_MMAP */ |
1da177e4c Linux-2.6.12-rc2 |
1479 |
/* |
8feae1311 NOMMU: Make VMAs ... |
1480 1481 |
* split a vma into two pieces at address 'addr', a new vma is allocated either * for the first part or the tail. |
1da177e4c Linux-2.6.12-rc2 |
1482 |
*/ |
8feae1311 NOMMU: Make VMAs ... |
1483 1484 |
int split_vma(struct mm_struct *mm, struct vm_area_struct *vma, unsigned long addr, int new_below) |
1da177e4c Linux-2.6.12-rc2 |
1485 |
{ |
8feae1311 NOMMU: Make VMAs ... |
1486 1487 1488 |
struct vm_area_struct *new; struct vm_region *region; unsigned long npages; |
1da177e4c Linux-2.6.12-rc2 |
1489 |
|
8feae1311 NOMMU: Make VMAs ... |
1490 |
kenter(""); |
1da177e4c Linux-2.6.12-rc2 |
1491 |
|
779c10232 nommu: remove a s... |
1492 1493 1494 |
/* we're only permitted to split anonymous regions (these should have * only a single usage on the region) */ if (vma->vm_file) |
8feae1311 NOMMU: Make VMAs ... |
1495 |
return -ENOMEM; |
1da177e4c Linux-2.6.12-rc2 |
1496 |
|
8feae1311 NOMMU: Make VMAs ... |
1497 1498 |
if (mm->map_count >= sysctl_max_map_count) return -ENOMEM; |
1da177e4c Linux-2.6.12-rc2 |
1499 |
|
8feae1311 NOMMU: Make VMAs ... |
1500 1501 1502 |
region = kmem_cache_alloc(vm_region_jar, GFP_KERNEL); if (!region) return -ENOMEM; |
1da177e4c Linux-2.6.12-rc2 |
1503 |
|
8feae1311 NOMMU: Make VMAs ... |
1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 |
new = kmem_cache_alloc(vm_area_cachep, GFP_KERNEL); if (!new) { kmem_cache_free(vm_region_jar, region); return -ENOMEM; } /* most fields are the same, copy all, and then fixup */ *new = *vma; *region = *vma->vm_region; new->vm_region = region; npages = (addr - vma->vm_start) >> PAGE_SHIFT; if (new_below) { |
dd8632a12 NOMMU: Make mmap ... |
1518 |
region->vm_top = region->vm_end = new->vm_end = addr; |
8feae1311 NOMMU: Make VMAs ... |
1519 1520 1521 |
} else { region->vm_start = new->vm_start = addr; region->vm_pgoff = new->vm_pgoff += npages; |
1da177e4c Linux-2.6.12-rc2 |
1522 |
} |
8feae1311 NOMMU: Make VMAs ... |
1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 |
if (new->vm_ops && new->vm_ops->open) new->vm_ops->open(new); delete_vma_from_mm(vma); down_write(&nommu_region_sem); delete_nommu_region(vma->vm_region); if (new_below) { vma->vm_region->vm_start = vma->vm_start = addr; vma->vm_region->vm_pgoff = vma->vm_pgoff += npages; } else { vma->vm_region->vm_end = vma->vm_end = addr; |
dd8632a12 NOMMU: Make mmap ... |
1535 |
vma->vm_region->vm_top = addr; |
8feae1311 NOMMU: Make VMAs ... |
1536 1537 1538 1539 1540 1541 1542 |
} add_nommu_region(vma->vm_region); add_nommu_region(new->vm_region); up_write(&nommu_region_sem); add_vma_to_mm(mm, vma); add_vma_to_mm(mm, new); return 0; |
1da177e4c Linux-2.6.12-rc2 |
1543 |
} |
3034097a5 [PATCH] NOMMU: Or... |
1544 |
/* |
8feae1311 NOMMU: Make VMAs ... |
1545 1546 |
* shrink a VMA by removing the specified chunk from either the beginning or * the end |
3034097a5 [PATCH] NOMMU: Or... |
1547 |
*/ |
8feae1311 NOMMU: Make VMAs ... |
1548 1549 1550 |
static int shrink_vma(struct mm_struct *mm, struct vm_area_struct *vma, unsigned long from, unsigned long to) |
1da177e4c Linux-2.6.12-rc2 |
1551 |
{ |
8feae1311 NOMMU: Make VMAs ... |
1552 |
struct vm_region *region; |
1da177e4c Linux-2.6.12-rc2 |
1553 |
|
8feae1311 NOMMU: Make VMAs ... |
1554 |
kenter(""); |
1da177e4c Linux-2.6.12-rc2 |
1555 |
|
8feae1311 NOMMU: Make VMAs ... |
1556 1557 1558 1559 1560 1561 1562 1563 |
/* adjust the VMA's pointers, which may reposition it in the MM's tree * and list */ delete_vma_from_mm(vma); if (from > vma->vm_start) vma->vm_end = from; else vma->vm_start = to; add_vma_to_mm(mm, vma); |
1da177e4c Linux-2.6.12-rc2 |
1564 |
|
8feae1311 NOMMU: Make VMAs ... |
1565 1566 |
/* cut the backing region down to size */ region = vma->vm_region; |
1e2ae599d nommu: struct vm_... |
1567 |
BUG_ON(region->vm_usage != 1); |
8feae1311 NOMMU: Make VMAs ... |
1568 1569 1570 |
down_write(&nommu_region_sem); delete_nommu_region(region); |
dd8632a12 NOMMU: Make mmap ... |
1571 1572 1573 1574 |
if (from > region->vm_start) { to = region->vm_top; region->vm_top = region->vm_end = from; } else { |
8feae1311 NOMMU: Make VMAs ... |
1575 |
region->vm_start = to; |
dd8632a12 NOMMU: Make mmap ... |
1576 |
} |
8feae1311 NOMMU: Make VMAs ... |
1577 1578 1579 1580 1581 1582 |
add_nommu_region(region); up_write(&nommu_region_sem); free_page_series(from, to); return 0; } |
1da177e4c Linux-2.6.12-rc2 |
1583 |
|
8feae1311 NOMMU: Make VMAs ... |
1584 1585 1586 1587 1588 1589 1590 1591 |
/* * release a mapping * - under NOMMU conditions the chunk to be unmapped must be backed by a single * VMA, though it need not cover the whole VMA */ int do_munmap(struct mm_struct *mm, unsigned long start, size_t len) { struct vm_area_struct *vma; |
f67d9b157 nommu: add page a... |
1592 |
unsigned long end; |
8feae1311 NOMMU: Make VMAs ... |
1593 |
int ret; |
1da177e4c Linux-2.6.12-rc2 |
1594 |
|
8feae1311 NOMMU: Make VMAs ... |
1595 |
kenter(",%lx,%zx", start, len); |
1da177e4c Linux-2.6.12-rc2 |
1596 |
|
f67d9b157 nommu: add page a... |
1597 |
len = PAGE_ALIGN(len); |
8feae1311 NOMMU: Make VMAs ... |
1598 1599 |
if (len == 0) return -EINVAL; |
365e9c87a [PATCH] mm: updat... |
1600 |
|
f67d9b157 nommu: add page a... |
1601 |
end = start + len; |
8feae1311 NOMMU: Make VMAs ... |
1602 1603 1604 |
/* find the first potentially overlapping VMA */ vma = find_vma(mm, start); if (!vma) { |
33e5d7697 nommu: fix a numb... |
1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 |
static int limit = 0; if (limit < 5) { printk(KERN_WARNING "munmap of memory not mmapped by process %d" " (%s): 0x%lx-0x%lx ", current->pid, current->comm, start, start + len - 1); limit++; } |
8feae1311 NOMMU: Make VMAs ... |
1615 1616 |
return -EINVAL; } |
1da177e4c Linux-2.6.12-rc2 |
1617 |
|
8feae1311 NOMMU: Make VMAs ... |
1618 1619 1620 1621 1622 1623 1624 1625 1626 |
/* we're allowed to split an anonymous VMA but not a file-backed one */ if (vma->vm_file) { do { if (start > vma->vm_start) { kleave(" = -EINVAL [miss]"); return -EINVAL; } if (end == vma->vm_end) goto erase_whole_vma; |
d75a310c4 mm: nommu: check ... |
1627 1628 |
vma = vma->vm_next; } while (vma); |
8feae1311 NOMMU: Make VMAs ... |
1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 |
kleave(" = -EINVAL [split file]"); return -EINVAL; } else { /* the chunk must be a subset of the VMA found */ if (start == vma->vm_start && end == vma->vm_end) goto erase_whole_vma; if (start < vma->vm_start || end > vma->vm_end) { kleave(" = -EINVAL [superset]"); return -EINVAL; } if (start & ~PAGE_MASK) { kleave(" = -EINVAL [unaligned start]"); return -EINVAL; } if (end != vma->vm_end && end & ~PAGE_MASK) { kleave(" = -EINVAL [unaligned split]"); return -EINVAL; } if (start != vma->vm_start && end != vma->vm_end) { ret = split_vma(mm, vma, start, 1); if (ret < 0) { kleave(" = %d [split]", ret); return ret; } } return shrink_vma(mm, vma, start, end); } |
1da177e4c Linux-2.6.12-rc2 |
1656 |
|
8feae1311 NOMMU: Make VMAs ... |
1657 1658 1659 1660 |
erase_whole_vma: delete_vma_from_mm(vma); delete_vma(mm, vma); kleave(" = 0"); |
1da177e4c Linux-2.6.12-rc2 |
1661 1662 |
return 0; } |
b50731732 nommu: vmalloc_32... |
1663 |
EXPORT_SYMBOL(do_munmap); |
1da177e4c Linux-2.6.12-rc2 |
1664 |
|
bfce281c2 kill mm argument ... |
1665 |
int vm_munmap(unsigned long addr, size_t len) |
3034097a5 [PATCH] NOMMU: Or... |
1666 |
{ |
bfce281c2 kill mm argument ... |
1667 |
struct mm_struct *mm = current->mm; |
3034097a5 [PATCH] NOMMU: Or... |
1668 |
int ret; |
3034097a5 [PATCH] NOMMU: Or... |
1669 1670 1671 1672 1673 1674 |
down_write(&mm->mmap_sem); ret = do_munmap(mm, addr, len); up_write(&mm->mmap_sem); return ret; } |
a46ef99d8 VM: add "vm_munma... |
1675 1676 1677 1678 |
EXPORT_SYMBOL(vm_munmap); SYSCALL_DEFINE2(munmap, unsigned long, addr, size_t, len) { |
bfce281c2 kill mm argument ... |
1679 |
return vm_munmap(addr, len); |
a46ef99d8 VM: add "vm_munma... |
1680 |
} |
3034097a5 [PATCH] NOMMU: Or... |
1681 1682 |
/* |
8feae1311 NOMMU: Make VMAs ... |
1683 |
* release all the mappings made in a process's VM space |
3034097a5 [PATCH] NOMMU: Or... |
1684 |
*/ |
8feae1311 NOMMU: Make VMAs ... |
1685 |
void exit_mmap(struct mm_struct *mm) |
1da177e4c Linux-2.6.12-rc2 |
1686 |
{ |
8feae1311 NOMMU: Make VMAs ... |
1687 |
struct vm_area_struct *vma; |
1da177e4c Linux-2.6.12-rc2 |
1688 |
|
8feae1311 NOMMU: Make VMAs ... |
1689 1690 |
if (!mm) return; |
1da177e4c Linux-2.6.12-rc2 |
1691 |
|
8feae1311 NOMMU: Make VMAs ... |
1692 |
kenter(""); |
1da177e4c Linux-2.6.12-rc2 |
1693 |
|
8feae1311 NOMMU: Make VMAs ... |
1694 |
mm->total_vm = 0; |
1da177e4c Linux-2.6.12-rc2 |
1695 |
|
8feae1311 NOMMU: Make VMAs ... |
1696 1697 1698 1699 |
while ((vma = mm->mmap)) { mm->mmap = vma->vm_next; delete_vma_from_mm(vma); delete_vma(mm, vma); |
04c349615 nommu: yield CPU ... |
1700 |
cond_resched(); |
1da177e4c Linux-2.6.12-rc2 |
1701 |
} |
8feae1311 NOMMU: Make VMAs ... |
1702 1703 |
kleave(""); |
1da177e4c Linux-2.6.12-rc2 |
1704 |
} |
e4eb1ff61 VM: add "vm_brk()... |
1705 |
unsigned long vm_brk(unsigned long addr, unsigned long len) |
1da177e4c Linux-2.6.12-rc2 |
1706 1707 1708 1709 1710 |
{ return -ENOMEM; } /* |
6fa5f80bc [PATCH] NOMMU: Ma... |
1711 1712 |
* expand (or shrink) an existing mapping, potentially moving it at the same * time (controlled by the MREMAP_MAYMOVE flag and available VM space) |
1da177e4c Linux-2.6.12-rc2 |
1713 |
* |
6fa5f80bc [PATCH] NOMMU: Ma... |
1714 |
* under NOMMU conditions, we only permit changing a mapping's size, and only |
8feae1311 NOMMU: Make VMAs ... |
1715 1716 |
* as long as it stays within the region allocated by do_mmap_private() and the * block is not shareable |
1da177e4c Linux-2.6.12-rc2 |
1717 |
* |
6fa5f80bc [PATCH] NOMMU: Ma... |
1718 |
* MREMAP_FIXED is not supported under NOMMU conditions |
1da177e4c Linux-2.6.12-rc2 |
1719 |
*/ |
4b377bab2 make do_mremap() ... |
1720 |
static unsigned long do_mremap(unsigned long addr, |
1da177e4c Linux-2.6.12-rc2 |
1721 1722 1723 |
unsigned long old_len, unsigned long new_len, unsigned long flags, unsigned long new_addr) { |
6fa5f80bc [PATCH] NOMMU: Ma... |
1724 |
struct vm_area_struct *vma; |
1da177e4c Linux-2.6.12-rc2 |
1725 1726 |
/* insanity checks first */ |
f67d9b157 nommu: add page a... |
1727 1728 |
old_len = PAGE_ALIGN(old_len); new_len = PAGE_ALIGN(new_len); |
8feae1311 NOMMU: Make VMAs ... |
1729 |
if (old_len == 0 || new_len == 0) |
1da177e4c Linux-2.6.12-rc2 |
1730 |
return (unsigned long) -EINVAL; |
8feae1311 NOMMU: Make VMAs ... |
1731 1732 |
if (addr & ~PAGE_MASK) return -EINVAL; |
1da177e4c Linux-2.6.12-rc2 |
1733 1734 |
if (flags & MREMAP_FIXED && new_addr != addr) return (unsigned long) -EINVAL; |
8feae1311 NOMMU: Make VMAs ... |
1735 |
vma = find_vma_exact(current->mm, addr, old_len); |
6fa5f80bc [PATCH] NOMMU: Ma... |
1736 1737 |
if (!vma) return (unsigned long) -EINVAL; |
1da177e4c Linux-2.6.12-rc2 |
1738 |
|
6fa5f80bc [PATCH] NOMMU: Ma... |
1739 |
if (vma->vm_end != vma->vm_start + old_len) |
1da177e4c Linux-2.6.12-rc2 |
1740 |
return (unsigned long) -EFAULT; |
6fa5f80bc [PATCH] NOMMU: Ma... |
1741 |
if (vma->vm_flags & VM_MAYSHARE) |
1da177e4c Linux-2.6.12-rc2 |
1742 |
return (unsigned long) -EPERM; |
8feae1311 NOMMU: Make VMAs ... |
1743 |
if (new_len > vma->vm_region->vm_end - vma->vm_region->vm_start) |
1da177e4c Linux-2.6.12-rc2 |
1744 1745 1746 |
return (unsigned long) -ENOMEM; /* all checks complete - do it */ |
6fa5f80bc [PATCH] NOMMU: Ma... |
1747 |
vma->vm_end = vma->vm_start + new_len; |
6fa5f80bc [PATCH] NOMMU: Ma... |
1748 1749 |
return vma->vm_start; } |
6a6160a7b [CVE-2009-0029] S... |
1750 1751 1752 |
SYSCALL_DEFINE5(mremap, unsigned long, addr, unsigned long, old_len, unsigned long, new_len, unsigned long, flags, unsigned long, new_addr) |
6fa5f80bc [PATCH] NOMMU: Ma... |
1753 1754 1755 1756 1757 1758 1759 |
{ unsigned long ret; down_write(¤t->mm->mmap_sem); ret = do_mremap(addr, old_len, new_len, flags, new_addr); up_write(¤t->mm->mmap_sem); return ret; |
1da177e4c Linux-2.6.12-rc2 |
1760 |
} |
240aadeed mm: accelerate mm... |
1761 1762 1763 |
struct page *follow_page_mask(struct vm_area_struct *vma, unsigned long address, unsigned int flags, unsigned int *page_mask) |
1da177e4c Linux-2.6.12-rc2 |
1764 |
{ |
240aadeed mm: accelerate mm... |
1765 |
*page_mask = 0; |
1da177e4c Linux-2.6.12-rc2 |
1766 1767 |
return NULL; } |
8f3b1327a mm/nommu.c: fix r... |
1768 1769 |
int remap_pfn_range(struct vm_area_struct *vma, unsigned long addr, unsigned long pfn, unsigned long size, pgprot_t prot) |
1da177e4c Linux-2.6.12-rc2 |
1770 |
{ |
8f3b1327a mm/nommu.c: fix r... |
1771 1772 |
if (addr != (pfn << PAGE_SHIFT)) return -EINVAL; |
314e51b98 mm: kill vma flag... |
1773 |
vma->vm_flags |= VM_IO | VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP; |
66aa2b4b1 [PATCH] uclinux: ... |
1774 |
return 0; |
1da177e4c Linux-2.6.12-rc2 |
1775 |
} |
22c4af409 [PATCH] nommu: ex... |
1776 |
EXPORT_SYMBOL(remap_pfn_range); |
1da177e4c Linux-2.6.12-rc2 |
1777 |
|
3c0b9de6d vm: add no-mmu vm... |
1778 1779 1780 1781 1782 1783 1784 1785 1786 |
int vm_iomap_memory(struct vm_area_struct *vma, phys_addr_t start, unsigned long len) { unsigned long pfn = start >> PAGE_SHIFT; unsigned long vm_len = vma->vm_end - vma->vm_start; pfn += vma->vm_pgoff; return io_remap_pfn_range(vma, vma->vm_start, pfn, vm_len, vma->vm_page_prot); } EXPORT_SYMBOL(vm_iomap_memory); |
f905bc447 nommu: add new vm... |
1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 |
int remap_vmalloc_range(struct vm_area_struct *vma, void *addr, unsigned long pgoff) { unsigned int size = vma->vm_end - vma->vm_start; if (!(vma->vm_flags & VM_USERMAP)) return -EINVAL; vma->vm_start = (unsigned long)(addr + (pgoff << PAGE_SHIFT)); vma->vm_end = vma->vm_start + size; return 0; } EXPORT_SYMBOL(remap_vmalloc_range); |
1da177e4c Linux-2.6.12-rc2 |
1801 1802 1803 1804 1805 |
unsigned long arch_get_unmapped_area(struct file *file, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags) { return -ENOMEM; } |
1363c3cd8 [PATCH] Avoiding ... |
1806 |
void arch_unmap_area(struct mm_struct *mm, unsigned long addr) |
1da177e4c Linux-2.6.12-rc2 |
1807 1808 |
{ } |
1da177e4c Linux-2.6.12-rc2 |
1809 1810 1811 1812 1813 |
void unmap_mapping_range(struct address_space *mapping, loff_t const holebegin, loff_t const holelen, int even_cows) { } |
22c4af409 [PATCH] nommu: ex... |
1814 |
EXPORT_SYMBOL(unmap_mapping_range); |
1da177e4c Linux-2.6.12-rc2 |
1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 |
/* * Check that a process has enough memory to allocate a new virtual * mapping. 0 means there is enough memory for the allocation to * succeed and -ENOMEM implies there is not. * * We currently support three overcommit policies, which are set via the * vm.overcommit_memory sysctl. See Documentation/vm/overcommit-accounting * * Strict overcommit modes added 2002 Feb 26 by Alan Cox. * Additional code 2002 Jul 20 by Robert Love. * * cap_sys_admin is 1 if the process has admin privileges, 0 otherwise. * * Note this is a helper function intended to be used by LSMs which * wish to use this logic. */ |
34b4e4aa3 fix NULL pointer ... |
1832 |
int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin) |
1da177e4c Linux-2.6.12-rc2 |
1833 |
{ |
c9b1d0981 mm: limit growth ... |
1834 |
unsigned long free, allowed, reserve; |
1da177e4c Linux-2.6.12-rc2 |
1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 |
vm_acct_memory(pages); /* * Sometimes we want to use more memory than we have */ if (sysctl_overcommit_memory == OVERCOMMIT_ALWAYS) return 0; if (sysctl_overcommit_memory == OVERCOMMIT_GUESS) { |
c15bef309 mmap: fix and tid... |
1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 |
free = global_page_state(NR_FREE_PAGES); free += global_page_state(NR_FILE_PAGES); /* * shmem pages shouldn't be counted as free in this * case, they can't be purged, only swapped out, and * that won't affect the overall amount of available * memory in the system. */ free -= global_page_state(NR_SHMEM); |
1da177e4c Linux-2.6.12-rc2 |
1855 |
|
ec8acf20a swap: add per-par... |
1856 |
free += get_nr_swap_pages(); |
1da177e4c Linux-2.6.12-rc2 |
1857 1858 1859 1860 1861 1862 1863 |
/* * Any slabs which are created with the * SLAB_RECLAIM_ACCOUNT flag claim to have contents * which are reclaimable, under pressure. The dentry * cache and most inode caches should fall into this */ |
972d1a7b1 [PATCH] ZVC: Supp... |
1864 |
free += global_page_state(NR_SLAB_RECLAIMABLE); |
1da177e4c Linux-2.6.12-rc2 |
1865 1866 |
/* |
d5ddc79bc [PATCH] overcommi... |
1867 1868 |
* Leave reserved pages. The pages are not for anonymous pages. */ |
c15bef309 mmap: fix and tid... |
1869 |
if (free <= totalreserve_pages) |
d5ddc79bc [PATCH] overcommi... |
1870 1871 |
goto error; else |
c15bef309 mmap: fix and tid... |
1872 |
free -= totalreserve_pages; |
d5ddc79bc [PATCH] overcommi... |
1873 1874 |
/* |
4eeab4f55 mm: replace hardc... |
1875 |
* Reserve some for root |
d5ddc79bc [PATCH] overcommi... |
1876 |
*/ |
1da177e4c Linux-2.6.12-rc2 |
1877 |
if (!cap_sys_admin) |
4eeab4f55 mm: replace hardc... |
1878 |
free -= sysctl_admin_reserve_kbytes >> (PAGE_SHIFT - 10); |
1da177e4c Linux-2.6.12-rc2 |
1879 1880 1881 |
if (free > pages) return 0; |
d5ddc79bc [PATCH] overcommi... |
1882 1883 |
goto error; |
1da177e4c Linux-2.6.12-rc2 |
1884 1885 1886 1887 |
} allowed = totalram_pages * sysctl_overcommit_ratio / 100; /* |
4eeab4f55 mm: replace hardc... |
1888 |
* Reserve some 3% for root |
1da177e4c Linux-2.6.12-rc2 |
1889 1890 |
*/ if (!cap_sys_admin) |
4eeab4f55 mm: replace hardc... |
1891 |
allowed -= sysctl_admin_reserve_kbytes >> (PAGE_SHIFT - 10); |
1da177e4c Linux-2.6.12-rc2 |
1892 |
allowed += total_swap_pages; |
c9b1d0981 mm: limit growth ... |
1893 1894 1895 1896 1897 1898 1899 |
/* * Don't let a single process grow so big a user can't recover */ if (mm) { reserve = sysctl_user_reserve_kbytes >> (PAGE_SHIFT - 10); allowed -= min(mm->total_vm / 32, reserve); } |
1da177e4c Linux-2.6.12-rc2 |
1900 |
|
00a62ce91 mm: fix Committed... |
1901 |
if (percpu_counter_read_positive(&vm_committed_as) < allowed) |
1da177e4c Linux-2.6.12-rc2 |
1902 |
return 0; |
00a62ce91 mm: fix Committed... |
1903 |
|
d5ddc79bc [PATCH] overcommi... |
1904 |
error: |
1da177e4c Linux-2.6.12-rc2 |
1905 1906 1907 1908 |
vm_unacct_memory(pages); return -ENOMEM; } |
cae5d3903 mm: arch: rename ... |
1909 |
int in_gate_area_no_mm(unsigned long addr) |
1da177e4c Linux-2.6.12-rc2 |
1910 1911 1912 |
{ return 0; } |
b0e15190e [PATCH] NOMMU: Ma... |
1913 |
|
d0217ac04 mm: fault feedbac... |
1914 |
int filemap_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
b0e15190e [PATCH] NOMMU: Ma... |
1915 1916 |
{ BUG(); |
d0217ac04 mm: fault feedbac... |
1917 |
return 0; |
b0e15190e [PATCH] NOMMU: Ma... |
1918 |
} |
b50731732 nommu: vmalloc_32... |
1919 |
EXPORT_SYMBOL(filemap_fault); |
0ec76a110 [PATCH] NOMMU: Ch... |
1920 |
|
0b173bc4d mm: kill vma flag... |
1921 1922 1923 1924 1925 1926 1927 |
int generic_file_remap_pages(struct vm_area_struct *vma, unsigned long addr, unsigned long size, pgoff_t pgoff) { BUG(); return 0; } EXPORT_SYMBOL(generic_file_remap_pages); |
f55f199b7 NOMMU: implement ... |
1928 1929 |
static int __access_remote_vm(struct task_struct *tsk, struct mm_struct *mm, unsigned long addr, void *buf, int len, int write) |
0ec76a110 [PATCH] NOMMU: Ch... |
1930 |
{ |
0ec76a110 [PATCH] NOMMU: Ch... |
1931 |
struct vm_area_struct *vma; |
0ec76a110 [PATCH] NOMMU: Ch... |
1932 1933 1934 1935 |
down_read(&mm->mmap_sem); /* the access must start within one of the target process's mappings */ |
0159b141d [PATCH] NOMMU: Us... |
1936 1937 |
vma = find_vma(mm, addr); if (vma) { |
0ec76a110 [PATCH] NOMMU: Ch... |
1938 1939 1940 1941 1942 |
/* don't overrun this mapping */ if (addr + len >= vma->vm_end) len = vma->vm_end - addr; /* only read or write mappings where it is permitted */ |
d00c7b993 [PATCH] NOMMU: Pe... |
1943 |
if (write && vma->vm_flags & VM_MAYWRITE) |
7959722b9 NOMMU: Use copy_*... |
1944 1945 |
copy_to_user_page(vma, NULL, addr, (void *) addr, buf, len); |
d00c7b993 [PATCH] NOMMU: Pe... |
1946 |
else if (!write && vma->vm_flags & VM_MAYREAD) |
7959722b9 NOMMU: Use copy_*... |
1947 1948 |
copy_from_user_page(vma, NULL, addr, buf, (void *) addr, len); |
0ec76a110 [PATCH] NOMMU: Ch... |
1949 1950 1951 1952 1953 1954 1955 |
else len = 0; } else { len = 0; } up_read(&mm->mmap_sem); |
f55f199b7 NOMMU: implement ... |
1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 |
return len; } /** * @access_remote_vm - access another process' address space * @mm: the mm_struct of the target address space * @addr: start address to access * @buf: source or destination buffer * @len: number of bytes to transfer * @write: whether the access is a write * * The caller must hold a reference on @mm. */ int access_remote_vm(struct mm_struct *mm, unsigned long addr, void *buf, int len, int write) { return __access_remote_vm(NULL, mm, addr, buf, len, write); } /* * Access another process' address space. * - source/target buffer must be kernel space */ int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, int len, int write) { struct mm_struct *mm; if (addr + len < addr) return 0; mm = get_task_mm(tsk); if (!mm) return 0; len = __access_remote_vm(tsk, mm, addr, buf, len, write); |
0ec76a110 [PATCH] NOMMU: Ch... |
1992 1993 1994 |
mmput(mm); return len; } |
7e6608724 nommu: fix shared... |
1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 |
/** * nommu_shrink_inode_mappings - Shrink the shared mappings on an inode * @inode: The inode to check * @size: The current filesize of the inode * @newsize: The proposed filesize of the inode * * Check the shared mappings on an inode on behalf of a shrinking truncate to * make sure that that any outstanding VMAs aren't broken and then shrink the * vm_regions that extend that beyond so that do_mmap_pgoff() doesn't * automatically grant mappings that are too large. */ int nommu_shrink_inode_mappings(struct inode *inode, size_t size, size_t newsize) { struct vm_area_struct *vma; |
7e6608724 nommu: fix shared... |
2011 2012 2013 2014 2015 2016 2017 2018 |
struct vm_region *region; pgoff_t low, high; size_t r_size, r_top; low = newsize >> PAGE_SHIFT; high = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; down_write(&nommu_region_sem); |
918e556ec NOMMU: Lock i_mma... |
2019 |
mutex_lock(&inode->i_mapping->i_mmap_mutex); |
7e6608724 nommu: fix shared... |
2020 2021 |
/* search for VMAs that fall within the dead zone */ |
6b2dbba8b mm: replace vma p... |
2022 |
vma_interval_tree_foreach(vma, &inode->i_mapping->i_mmap, low, high) { |
7e6608724 nommu: fix shared... |
2023 2024 2025 |
/* found one - only interested if it's shared out of the page * cache */ if (vma->vm_flags & VM_SHARED) { |
918e556ec NOMMU: Lock i_mma... |
2026 |
mutex_unlock(&inode->i_mapping->i_mmap_mutex); |
7e6608724 nommu: fix shared... |
2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 |
up_write(&nommu_region_sem); return -ETXTBSY; /* not quite true, but near enough */ } } /* reduce any regions that overlap the dead zone - if in existence, * these will be pointed to by VMAs that don't overlap the dead zone * * we don't check for any regions that start beyond the EOF as there * shouldn't be any */ |
6b2dbba8b mm: replace vma p... |
2038 2039 |
vma_interval_tree_foreach(vma, &inode->i_mapping->i_mmap, 0, ULONG_MAX) { |
7e6608724 nommu: fix shared... |
2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 |
if (!(vma->vm_flags & VM_SHARED)) continue; region = vma->vm_region; r_size = region->vm_top - region->vm_start; r_top = (region->vm_pgoff << PAGE_SHIFT) + r_size; if (r_top > newsize) { region->vm_top -= r_top - newsize; if (region->vm_end > region->vm_top) region->vm_end = region->vm_top; } } |
918e556ec NOMMU: Lock i_mma... |
2053 |
mutex_unlock(&inode->i_mapping->i_mmap_mutex); |
7e6608724 nommu: fix shared... |
2054 2055 2056 |
up_write(&nommu_region_sem); return 0; } |
c9b1d0981 mm: limit growth ... |
2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 |
/* * Initialise sysctl_user_reserve_kbytes. * * This is intended to prevent a user from starting a single memory hogging * process, such that they cannot recover (kill the hog) in OVERCOMMIT_NEVER * mode. * * The default value is min(3% of free memory, 128MB) * 128MB is enough to recover with sshd/login, bash, and top/kill. */ static int __meminit init_user_reserve(void) { unsigned long free_kbytes; free_kbytes = global_page_state(NR_FREE_PAGES) << (PAGE_SHIFT - 10); sysctl_user_reserve_kbytes = min(free_kbytes / 32, 1UL << 17); return 0; } module_init(init_user_reserve) |
4eeab4f55 mm: replace hardc... |
2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 |
/* * Initialise sysctl_admin_reserve_kbytes. * * The purpose of sysctl_admin_reserve_kbytes is to allow the sys admin * to log in and kill a memory hogging process. * * Systems with more than 256MB will reserve 8MB, enough to recover * with sshd, bash, and top in OVERCOMMIT_GUESS. Smaller systems will * only reserve 3% of free pages by default. */ static int __meminit init_admin_reserve(void) { unsigned long free_kbytes; free_kbytes = global_page_state(NR_FREE_PAGES) << (PAGE_SHIFT - 10); sysctl_admin_reserve_kbytes = min(free_kbytes / 32, 1UL << 13); return 0; } module_init(init_admin_reserve) |