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16e9f408 LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2012 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
16e9f408 LP |
22 | #include <errno.h> |
23 | #include <stdlib.h> | |
f8019684 | 24 | #include <sys/mman.h> |
16e9f408 LP |
25 | #include <string.h> |
26 | ||
f8019684 LP |
27 | #include "hashmap.h" |
28 | #include "list.h" | |
29 | #include "log.h" | |
16e9f408 | 30 | #include "util.h" |
f8019684 | 31 | #include "macro.h" |
16e9f408 LP |
32 | #include "mmap-cache.h" |
33 | ||
f8019684 LP |
34 | typedef struct Window Window; |
35 | typedef struct Context Context; | |
36 | typedef struct FileDescriptor FileDescriptor; | |
84168d80 | 37 | |
f8019684 LP |
38 | struct Window { |
39 | MMapCache *cache; | |
40 | ||
1b8951e5 | 41 | bool keep_always; |
f8019684 | 42 | bool in_unused; |
16e9f408 | 43 | |
68667801 | 44 | int prot; |
16e9f408 LP |
45 | void *ptr; |
46 | uint64_t offset; | |
f8019684 LP |
47 | size_t size; |
48 | ||
49 | FileDescriptor *fd; | |
16e9f408 | 50 | |
f8019684 LP |
51 | LIST_FIELDS(Window, by_fd); |
52 | LIST_FIELDS(Window, unused); | |
53 | ||
54 | LIST_HEAD(Context, contexts); | |
55 | }; | |
16e9f408 | 56 | |
f8019684 LP |
57 | struct Context { |
58 | MMapCache *cache; | |
59 | unsigned id; | |
60 | Window *window; | |
16e9f408 | 61 | |
f8019684 LP |
62 | LIST_FIELDS(Context, by_window); |
63 | }; | |
64 | ||
65 | struct FileDescriptor { | |
66 | MMapCache *cache; | |
16e9f408 | 67 | int fd; |
f8019684 LP |
68 | LIST_HEAD(Window, windows); |
69 | }; | |
16e9f408 LP |
70 | |
71 | struct MMapCache { | |
f8019684 | 72 | int n_ref; |
68667801 | 73 | unsigned n_windows; |
16e9f408 | 74 | |
bf807d4d LP |
75 | unsigned n_hit, n_missed; |
76 | ||
77 | ||
f8019684 LP |
78 | Hashmap *fds; |
79 | Hashmap *contexts; | |
16e9f408 | 80 | |
f8019684 LP |
81 | LIST_HEAD(Window, unused); |
82 | Window *last_unused; | |
16e9f408 LP |
83 | }; |
84 | ||
f8019684 | 85 | #define WINDOWS_MIN 64 |
fad5a6c6 MS |
86 | |
87 | #ifdef ENABLE_DEBUG_MMAP_CACHE | |
88 | /* Tiny windows increase mmap activity and the chance of exposing unsafe use. */ | |
89 | # define WINDOW_SIZE (page_size()) | |
90 | #else | |
91 | # define WINDOW_SIZE (8ULL*1024ULL*1024ULL) | |
92 | #endif | |
16e9f408 | 93 | |
f8019684 LP |
94 | MMapCache* mmap_cache_new(void) { |
95 | MMapCache *m; | |
16e9f408 | 96 | |
f8019684 LP |
97 | m = new0(MMapCache, 1); |
98 | if (!m) | |
99 | return NULL; | |
16e9f408 | 100 | |
f8019684 LP |
101 | m->n_ref = 1; |
102 | return m; | |
16e9f408 LP |
103 | } |
104 | ||
f8019684 | 105 | MMapCache* mmap_cache_ref(MMapCache *m) { |
16e9f408 | 106 | assert(m); |
f8019684 | 107 | assert(m->n_ref > 0); |
16e9f408 | 108 | |
f8019684 LP |
109 | m->n_ref ++; |
110 | return m; | |
111 | } | |
f65425cb | 112 | |
f8019684 LP |
113 | static void window_unlink(Window *w) { |
114 | Context *c; | |
f65425cb | 115 | |
f8019684 | 116 | assert(w); |
16e9f408 | 117 | |
f8019684 LP |
118 | if (w->ptr) |
119 | munmap(w->ptr, w->size); | |
16e9f408 | 120 | |
f8019684 | 121 | if (w->fd) |
71fda00f | 122 | LIST_REMOVE(by_fd, w->fd->windows, w); |
16e9f408 | 123 | |
f8019684 LP |
124 | if (w->in_unused) { |
125 | if (w->cache->last_unused == w) | |
126 | w->cache->last_unused = w->unused_prev; | |
16e9f408 | 127 | |
71fda00f | 128 | LIST_REMOVE(unused, w->cache->unused, w); |
f65425cb | 129 | } |
16e9f408 | 130 | |
f8019684 LP |
131 | LIST_FOREACH(by_window, c, w->contexts) { |
132 | assert(c->window == w); | |
133 | c->window = NULL; | |
f65425cb | 134 | } |
16e9f408 LP |
135 | } |
136 | ||
f8019684 LP |
137 | static void window_free(Window *w) { |
138 | assert(w); | |
f65425cb | 139 | |
f8019684 | 140 | window_unlink(w); |
89de6947 | 141 | w->cache->n_windows--; |
f8019684 LP |
142 | free(w); |
143 | } | |
f65425cb | 144 | |
44a6b1b6 | 145 | _pure_ static bool window_matches(Window *w, int fd, int prot, uint64_t offset, size_t size) { |
f8019684 LP |
146 | assert(w); |
147 | assert(fd >= 0); | |
148 | assert(size > 0); | |
16e9f408 | 149 | |
f8019684 LP |
150 | return |
151 | w->fd && | |
152 | fd == w->fd->fd && | |
153 | prot == w->prot && | |
154 | offset >= w->offset && | |
155 | offset + size <= w->offset + w->size; | |
16e9f408 LP |
156 | } |
157 | ||
f8019684 LP |
158 | static Window *window_add(MMapCache *m) { |
159 | Window *w; | |
16e9f408 LP |
160 | |
161 | assert(m); | |
16e9f408 | 162 | |
f8019684 | 163 | if (!m->last_unused || m->n_windows <= WINDOWS_MIN) { |
f65425cb | 164 | |
f8019684 LP |
165 | /* Allocate a new window */ |
166 | w = new0(Window, 1); | |
167 | if (!w) | |
168 | return NULL; | |
89de6947 | 169 | m->n_windows++; |
f65425cb | 170 | } else { |
16e9f408 | 171 | |
f8019684 LP |
172 | /* Reuse an existing one */ |
173 | w = m->last_unused; | |
174 | window_unlink(w); | |
175 | zero(*w); | |
f65425cb | 176 | } |
f8019684 LP |
177 | |
178 | w->cache = m; | |
179 | return w; | |
16e9f408 LP |
180 | } |
181 | ||
f8019684 LP |
182 | static void context_detach_window(Context *c) { |
183 | Window *w; | |
16e9f408 | 184 | |
f8019684 | 185 | assert(c); |
16e9f408 | 186 | |
f8019684 | 187 | if (!c->window) |
16e9f408 LP |
188 | return; |
189 | ||
f8019684 LP |
190 | w = c->window; |
191 | c->window = NULL; | |
71fda00f | 192 | LIST_REMOVE(by_window, w->contexts, c); |
16e9f408 | 193 | |
1b8951e5 | 194 | if (!w->contexts && !w->keep_always) { |
f8019684 | 195 | /* Not used anymore? */ |
fad5a6c6 MS |
196 | #ifdef ENABLE_DEBUG_MMAP_CACHE |
197 | /* Unmap unused windows immediately to expose use-after-unmap | |
198 | * by SIGSEGV. */ | |
199 | window_free(w); | |
200 | #else | |
71fda00f | 201 | LIST_PREPEND(unused, c->cache->unused, w); |
f8019684 LP |
202 | if (!c->cache->last_unused) |
203 | c->cache->last_unused = w; | |
16e9f408 | 204 | |
f8019684 | 205 | w->in_unused = true; |
fad5a6c6 | 206 | #endif |
f8019684 | 207 | } |
16e9f408 LP |
208 | } |
209 | ||
f8019684 LP |
210 | static void context_attach_window(Context *c, Window *w) { |
211 | assert(c); | |
212 | assert(w); | |
16e9f408 | 213 | |
f8019684 | 214 | if (c->window == w) |
16e9f408 LP |
215 | return; |
216 | ||
f8019684 | 217 | context_detach_window(c); |
16e9f408 | 218 | |
e18021f7 | 219 | if (w->in_unused) { |
f8019684 | 220 | /* Used again? */ |
71fda00f | 221 | LIST_REMOVE(unused, c->cache->unused, w); |
a2ab7ee6 CG |
222 | if (c->cache->last_unused == w) |
223 | c->cache->last_unused = w->unused_prev; | |
16e9f408 | 224 | |
f8019684 LP |
225 | w->in_unused = false; |
226 | } | |
f65425cb | 227 | |
f8019684 | 228 | c->window = w; |
71fda00f | 229 | LIST_PREPEND(by_window, w->contexts, c); |
16e9f408 LP |
230 | } |
231 | ||
f8019684 LP |
232 | static Context *context_add(MMapCache *m, unsigned id) { |
233 | Context *c; | |
234 | int r; | |
16e9f408 LP |
235 | |
236 | assert(m); | |
237 | ||
f8019684 LP |
238 | c = hashmap_get(m->contexts, UINT_TO_PTR(id + 1)); |
239 | if (c) | |
240 | return c; | |
241 | ||
d5099efc | 242 | r = hashmap_ensure_allocated(&m->contexts, NULL); |
f8019684 LP |
243 | if (r < 0) |
244 | return NULL; | |
245 | ||
246 | c = new0(Context, 1); | |
247 | if (!c) | |
248 | return NULL; | |
16e9f408 | 249 | |
f8019684 LP |
250 | c->cache = m; |
251 | c->id = id; | |
16e9f408 | 252 | |
f8019684 LP |
253 | r = hashmap_put(m->contexts, UINT_TO_PTR(id + 1), c); |
254 | if (r < 0) { | |
255 | free(c); | |
256 | return NULL; | |
16e9f408 LP |
257 | } |
258 | ||
f8019684 | 259 | return c; |
16e9f408 LP |
260 | } |
261 | ||
f8019684 LP |
262 | static void context_free(Context *c) { |
263 | assert(c); | |
16e9f408 | 264 | |
f8019684 | 265 | context_detach_window(c); |
16e9f408 | 266 | |
f8019684 LP |
267 | if (c->cache) |
268 | assert_se(hashmap_remove(c->cache->contexts, UINT_TO_PTR(c->id + 1))); | |
16e9f408 | 269 | |
f8019684 LP |
270 | free(c); |
271 | } | |
272 | ||
273 | static void fd_free(FileDescriptor *f) { | |
274 | assert(f); | |
275 | ||
276 | while (f->windows) | |
277 | window_free(f->windows); | |
278 | ||
279 | if (f->cache) | |
280 | assert_se(hashmap_remove(f->cache->fds, INT_TO_PTR(f->fd + 1))); | |
281 | ||
282 | free(f); | |
283 | } | |
284 | ||
285 | static FileDescriptor* fd_add(MMapCache *m, int fd) { | |
286 | FileDescriptor *f; | |
287 | int r; | |
288 | ||
289 | assert(m); | |
290 | assert(fd >= 0); | |
291 | ||
292 | f = hashmap_get(m->fds, INT_TO_PTR(fd + 1)); | |
293 | if (f) | |
294 | return f; | |
295 | ||
d5099efc | 296 | r = hashmap_ensure_allocated(&m->fds, NULL); |
f8019684 | 297 | if (r < 0) |
16e9f408 | 298 | return NULL; |
16e9f408 | 299 | |
f8019684 LP |
300 | f = new0(FileDescriptor, 1); |
301 | if (!f) | |
16e9f408 | 302 | return NULL; |
16e9f408 | 303 | |
f8019684 LP |
304 | f->cache = m; |
305 | f->fd = fd; | |
306 | ||
307 | r = hashmap_put(m->fds, UINT_TO_PTR(fd + 1), f); | |
308 | if (r < 0) { | |
309 | free(f); | |
16e9f408 LP |
310 | return NULL; |
311 | } | |
312 | ||
f8019684 | 313 | return f; |
16e9f408 LP |
314 | } |
315 | ||
f8019684 LP |
316 | static void mmap_cache_free(MMapCache *m) { |
317 | Context *c; | |
318 | FileDescriptor *f; | |
319 | ||
16e9f408 | 320 | assert(m); |
16e9f408 | 321 | |
f8019684 LP |
322 | while ((c = hashmap_first(m->contexts))) |
323 | context_free(c); | |
324 | ||
8e6d9397 GM |
325 | hashmap_free(m->contexts); |
326 | ||
f8019684 LP |
327 | while ((f = hashmap_first(m->fds))) |
328 | fd_free(f); | |
329 | ||
8e6d9397 GM |
330 | hashmap_free(m->fds); |
331 | ||
f8019684 LP |
332 | while (m->unused) |
333 | window_free(m->unused); | |
334 | ||
335 | free(m); | |
16e9f408 LP |
336 | } |
337 | ||
338 | MMapCache* mmap_cache_unref(MMapCache *m) { | |
339 | assert(m); | |
340 | assert(m->n_ref > 0); | |
341 | ||
f8019684 LP |
342 | m->n_ref --; |
343 | if (m->n_ref == 0) | |
16e9f408 | 344 | mmap_cache_free(m); |
16e9f408 LP |
345 | |
346 | return NULL; | |
347 | } | |
348 | ||
f8019684 LP |
349 | static int make_room(MMapCache *m) { |
350 | assert(m); | |
351 | ||
352 | if (!m->last_unused) | |
353 | return 0; | |
354 | ||
355 | window_free(m->last_unused); | |
356 | return 1; | |
357 | } | |
358 | ||
359 | static int try_context( | |
360 | MMapCache *m, | |
361 | int fd, | |
362 | int prot, | |
363 | unsigned context, | |
364 | bool keep_always, | |
365 | uint64_t offset, | |
366 | size_t size, | |
1b8951e5 | 367 | void **ret) { |
f8019684 LP |
368 | |
369 | Context *c; | |
f65425cb | 370 | |
16e9f408 | 371 | assert(m); |
f8019684 LP |
372 | assert(m->n_ref > 0); |
373 | assert(fd >= 0); | |
374 | assert(size > 0); | |
1b8951e5 | 375 | assert(ret); |
16e9f408 | 376 | |
f8019684 LP |
377 | c = hashmap_get(m->contexts, UINT_TO_PTR(context+1)); |
378 | if (!c) | |
16e9f408 | 379 | return 0; |
16e9f408 | 380 | |
f8019684 | 381 | assert(c->id == context); |
16e9f408 | 382 | |
f8019684 LP |
383 | if (!c->window) |
384 | return 0; | |
f65425cb | 385 | |
f8019684 | 386 | if (!window_matches(c->window, fd, prot, offset, size)) { |
f65425cb | 387 | |
f8019684 LP |
388 | /* Drop the reference to the window, since it's unnecessary now */ |
389 | context_detach_window(c); | |
390 | return 0; | |
f65425cb LP |
391 | } |
392 | ||
1b8951e5 | 393 | c->window->keep_always |= keep_always; |
16e9f408 | 394 | |
1b8951e5 | 395 | *ret = (uint8_t*) c->window->ptr + (offset - c->window->offset); |
f8019684 | 396 | return 1; |
16e9f408 LP |
397 | } |
398 | ||
f8019684 LP |
399 | static int find_mmap( |
400 | MMapCache *m, | |
401 | int fd, | |
402 | int prot, | |
403 | unsigned context, | |
404 | bool keep_always, | |
405 | uint64_t offset, | |
406 | size_t size, | |
1b8951e5 | 407 | void **ret) { |
f8019684 LP |
408 | |
409 | FileDescriptor *f; | |
410 | Window *w; | |
411 | Context *c; | |
16e9f408 LP |
412 | |
413 | assert(m); | |
f8019684 LP |
414 | assert(m->n_ref > 0); |
415 | assert(fd >= 0); | |
416 | assert(size > 0); | |
16e9f408 | 417 | |
f8019684 LP |
418 | f = hashmap_get(m->fds, INT_TO_PTR(fd + 1)); |
419 | if (!f) | |
420 | return 0; | |
16e9f408 | 421 | |
f8019684 | 422 | assert(f->fd == fd); |
16e9f408 | 423 | |
f8019684 LP |
424 | LIST_FOREACH(by_fd, w, f->windows) |
425 | if (window_matches(w, fd, prot, offset, size)) | |
426 | break; | |
16e9f408 | 427 | |
f8019684 LP |
428 | if (!w) |
429 | return 0; | |
430 | ||
431 | c = context_add(m, context); | |
432 | if (!c) | |
433 | return -ENOMEM; | |
434 | ||
435 | context_attach_window(c, w); | |
ae97089d | 436 | w->keep_always += keep_always; |
16e9f408 | 437 | |
1b8951e5 | 438 | *ret = (uint8_t*) w->ptr + (offset - w->offset); |
f8019684 | 439 | return 1; |
16e9f408 LP |
440 | } |
441 | ||
f8019684 | 442 | static int add_mmap( |
16e9f408 LP |
443 | MMapCache *m, |
444 | int fd, | |
16e9f408 LP |
445 | int prot, |
446 | unsigned context, | |
fcde2389 | 447 | bool keep_always, |
16e9f408 | 448 | uint64_t offset, |
f8019684 | 449 | size_t size, |
fcde2389 | 450 | struct stat *st, |
1b8951e5 | 451 | void **ret) { |
16e9f408 | 452 | |
16e9f408 | 453 | uint64_t woffset, wsize; |
f8019684 LP |
454 | Context *c; |
455 | FileDescriptor *f; | |
456 | Window *w; | |
457 | void *d; | |
16e9f408 LP |
458 | int r; |
459 | ||
460 | assert(m); | |
f8019684 | 461 | assert(m->n_ref > 0); |
16e9f408 | 462 | assert(fd >= 0); |
16e9f408 | 463 | assert(size > 0); |
1b8951e5 | 464 | assert(ret); |
16e9f408 LP |
465 | |
466 | woffset = offset & ~((uint64_t) page_size() - 1ULL); | |
467 | wsize = size + (offset - woffset); | |
468 | wsize = PAGE_ALIGN(wsize); | |
469 | ||
470 | if (wsize < WINDOW_SIZE) { | |
471 | uint64_t delta; | |
472 | ||
beec0085 | 473 | delta = PAGE_ALIGN((WINDOW_SIZE - wsize) / 2); |
16e9f408 LP |
474 | |
475 | if (delta > offset) | |
476 | woffset = 0; | |
477 | else | |
478 | woffset -= delta; | |
479 | ||
480 | wsize = WINDOW_SIZE; | |
481 | } | |
482 | ||
fcde2389 LP |
483 | if (st) { |
484 | /* Memory maps that are larger then the files | |
c5315881 | 485 | underneath have undefined behavior. Hence, clamp |
fcde2389 LP |
486 | things to the file size if we know it */ |
487 | ||
488 | if (woffset >= (uint64_t) st->st_size) | |
489 | return -EADDRNOTAVAIL; | |
490 | ||
491 | if (woffset + wsize > (uint64_t) st->st_size) | |
492 | wsize = PAGE_ALIGN(st->st_size - woffset); | |
493 | } | |
494 | ||
16e9f408 LP |
495 | for (;;) { |
496 | d = mmap(NULL, wsize, prot, MAP_SHARED, fd, woffset); | |
497 | if (d != MAP_FAILED) | |
498 | break; | |
499 | if (errno != ENOMEM) | |
500 | return -errno; | |
501 | ||
f8019684 | 502 | r = make_room(m); |
16e9f408 LP |
503 | if (r < 0) |
504 | return r; | |
505 | if (r == 0) | |
506 | return -ENOMEM; | |
507 | } | |
508 | ||
f8019684 LP |
509 | c = context_add(m, context); |
510 | if (!c) | |
b67ddc7b | 511 | goto outofmem; |
16e9f408 | 512 | |
f8019684 LP |
513 | f = fd_add(m, fd); |
514 | if (!f) | |
b67ddc7b | 515 | goto outofmem; |
16e9f408 | 516 | |
f8019684 LP |
517 | w = window_add(m); |
518 | if (!w) | |
b67ddc7b | 519 | goto outofmem; |
16e9f408 | 520 | |
f8019684 LP |
521 | w->keep_always = keep_always; |
522 | w->ptr = d; | |
523 | w->offset = woffset; | |
524 | w->prot = prot; | |
525 | w->size = wsize; | |
526 | w->fd = f; | |
16e9f408 | 527 | |
71fda00f | 528 | LIST_PREPEND(by_fd, f->windows, w); |
16e9f408 | 529 | |
f8019684 LP |
530 | context_detach_window(c); |
531 | c->window = w; | |
71fda00f | 532 | LIST_PREPEND(by_window, w->contexts, c); |
16e9f408 | 533 | |
1b8951e5 | 534 | *ret = (uint8_t*) w->ptr + (offset - w->offset); |
16e9f408 | 535 | return 1; |
b67ddc7b PDS |
536 | |
537 | outofmem: | |
538 | munmap(d, wsize); | |
539 | return -ENOMEM; | |
16e9f408 LP |
540 | } |
541 | ||
542 | int mmap_cache_get( | |
543 | MMapCache *m, | |
544 | int fd, | |
545 | int prot, | |
546 | unsigned context, | |
fcde2389 | 547 | bool keep_always, |
16e9f408 | 548 | uint64_t offset, |
f8019684 | 549 | size_t size, |
fcde2389 | 550 | struct stat *st, |
1b8951e5 | 551 | void **ret) { |
16e9f408 | 552 | |
16e9f408 LP |
553 | int r; |
554 | ||
555 | assert(m); | |
f8019684 | 556 | assert(m->n_ref > 0); |
16e9f408 | 557 | assert(fd >= 0); |
16e9f408 | 558 | assert(size > 0); |
1b8951e5 | 559 | assert(ret); |
16e9f408 | 560 | |
f8019684 | 561 | /* Check whether the current context is the right one already */ |
1b8951e5 | 562 | r = try_context(m, fd, prot, context, keep_always, offset, size, ret); |
bf807d4d LP |
563 | if (r != 0) { |
564 | m->n_hit ++; | |
16e9f408 | 565 | return r; |
bf807d4d | 566 | } |
16e9f408 | 567 | |
f8019684 | 568 | /* Search for a matching mmap */ |
1b8951e5 | 569 | r = find_mmap(m, fd, prot, context, keep_always, offset, size, ret); |
bf807d4d LP |
570 | if (r != 0) { |
571 | m->n_hit ++; | |
16e9f408 | 572 | return r; |
bf807d4d LP |
573 | } |
574 | ||
575 | m->n_missed++; | |
16e9f408 | 576 | |
f8019684 | 577 | /* Create a new mmap */ |
1b8951e5 | 578 | return add_mmap(m, fd, prot, context, keep_always, offset, size, st, ret); |
ae97089d ZJS |
579 | } |
580 | ||
16e9f408 | 581 | void mmap_cache_close_fd(MMapCache *m, int fd) { |
f8019684 | 582 | FileDescriptor *f; |
16e9f408 LP |
583 | |
584 | assert(m); | |
f8019684 | 585 | assert(fd >= 0); |
16e9f408 | 586 | |
f8019684 LP |
587 | f = hashmap_get(m->fds, INT_TO_PTR(fd + 1)); |
588 | if (!f) | |
16e9f408 | 589 | return; |
16e9f408 | 590 | |
f8019684 LP |
591 | fd_free(f); |
592 | } | |
16e9f408 | 593 | |
f8019684 LP |
594 | void mmap_cache_close_context(MMapCache *m, unsigned context) { |
595 | Context *c; | |
16e9f408 | 596 | |
f8019684 | 597 | assert(m); |
16e9f408 | 598 | |
f8019684 LP |
599 | c = hashmap_get(m->contexts, UINT_TO_PTR(context + 1)); |
600 | if (!c) | |
601 | return; | |
16e9f408 | 602 | |
f8019684 | 603 | context_free(c); |
16e9f408 | 604 | } |
bf807d4d LP |
605 | |
606 | unsigned mmap_cache_get_hit(MMapCache *m) { | |
607 | assert(m); | |
608 | ||
609 | return m->n_hit; | |
610 | } | |
611 | ||
612 | unsigned mmap_cache_get_missed(MMapCache *m) { | |
613 | assert(m); | |
614 | ||
615 | return m->n_missed; | |
616 | } |