]>
Commit | Line | Data |
---|---|---|
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 | ||
ae97089d | 41 | unsigned 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 LP |
85 | #define WINDOWS_MIN 64 |
86 | #define WINDOW_SIZE (8ULL*1024ULL*1024ULL) | |
16e9f408 | 87 | |
f8019684 LP |
88 | MMapCache* mmap_cache_new(void) { |
89 | MMapCache *m; | |
16e9f408 | 90 | |
f8019684 LP |
91 | m = new0(MMapCache, 1); |
92 | if (!m) | |
93 | return NULL; | |
16e9f408 | 94 | |
f8019684 LP |
95 | m->n_ref = 1; |
96 | return m; | |
16e9f408 LP |
97 | } |
98 | ||
f8019684 | 99 | MMapCache* mmap_cache_ref(MMapCache *m) { |
16e9f408 | 100 | assert(m); |
f8019684 | 101 | assert(m->n_ref > 0); |
16e9f408 | 102 | |
f8019684 LP |
103 | m->n_ref ++; |
104 | return m; | |
105 | } | |
f65425cb | 106 | |
f8019684 LP |
107 | static void window_unlink(Window *w) { |
108 | Context *c; | |
f65425cb | 109 | |
f8019684 | 110 | assert(w); |
16e9f408 | 111 | |
f8019684 LP |
112 | if (w->ptr) |
113 | munmap(w->ptr, w->size); | |
16e9f408 | 114 | |
f8019684 | 115 | if (w->fd) |
71fda00f | 116 | LIST_REMOVE(by_fd, w->fd->windows, w); |
16e9f408 | 117 | |
f8019684 LP |
118 | if (w->in_unused) { |
119 | if (w->cache->last_unused == w) | |
120 | w->cache->last_unused = w->unused_prev; | |
16e9f408 | 121 | |
71fda00f | 122 | LIST_REMOVE(unused, w->cache->unused, w); |
f65425cb | 123 | } |
16e9f408 | 124 | |
f8019684 LP |
125 | LIST_FOREACH(by_window, c, w->contexts) { |
126 | assert(c->window == w); | |
127 | c->window = NULL; | |
f65425cb | 128 | } |
16e9f408 LP |
129 | } |
130 | ||
f8019684 LP |
131 | static void window_free(Window *w) { |
132 | assert(w); | |
f65425cb | 133 | |
f8019684 | 134 | window_unlink(w); |
89de6947 | 135 | w->cache->n_windows--; |
f8019684 LP |
136 | free(w); |
137 | } | |
f65425cb | 138 | |
44a6b1b6 | 139 | _pure_ static bool window_matches(Window *w, int fd, int prot, uint64_t offset, size_t size) { |
f8019684 LP |
140 | assert(w); |
141 | assert(fd >= 0); | |
142 | assert(size > 0); | |
16e9f408 | 143 | |
f8019684 LP |
144 | return |
145 | w->fd && | |
146 | fd == w->fd->fd && | |
147 | prot == w->prot && | |
148 | offset >= w->offset && | |
149 | offset + size <= w->offset + w->size; | |
16e9f408 LP |
150 | } |
151 | ||
f8019684 LP |
152 | static Window *window_add(MMapCache *m) { |
153 | Window *w; | |
16e9f408 LP |
154 | |
155 | assert(m); | |
16e9f408 | 156 | |
f8019684 | 157 | if (!m->last_unused || m->n_windows <= WINDOWS_MIN) { |
f65425cb | 158 | |
f8019684 LP |
159 | /* Allocate a new window */ |
160 | w = new0(Window, 1); | |
161 | if (!w) | |
162 | return NULL; | |
89de6947 | 163 | m->n_windows++; |
f65425cb | 164 | } else { |
16e9f408 | 165 | |
f8019684 LP |
166 | /* Reuse an existing one */ |
167 | w = m->last_unused; | |
168 | window_unlink(w); | |
169 | zero(*w); | |
f65425cb | 170 | } |
f8019684 LP |
171 | |
172 | w->cache = m; | |
173 | return w; | |
16e9f408 LP |
174 | } |
175 | ||
f8019684 LP |
176 | static void context_detach_window(Context *c) { |
177 | Window *w; | |
16e9f408 | 178 | |
f8019684 | 179 | assert(c); |
16e9f408 | 180 | |
f8019684 | 181 | if (!c->window) |
16e9f408 LP |
182 | return; |
183 | ||
f8019684 LP |
184 | w = c->window; |
185 | c->window = NULL; | |
71fda00f | 186 | LIST_REMOVE(by_window, w->contexts, c); |
16e9f408 | 187 | |
ae97089d | 188 | if (!w->contexts && w->keep_always == 0) { |
f8019684 | 189 | /* Not used anymore? */ |
71fda00f | 190 | LIST_PREPEND(unused, c->cache->unused, w); |
f8019684 LP |
191 | if (!c->cache->last_unused) |
192 | c->cache->last_unused = w; | |
16e9f408 | 193 | |
f8019684 LP |
194 | w->in_unused = true; |
195 | } | |
16e9f408 LP |
196 | } |
197 | ||
f8019684 LP |
198 | static void context_attach_window(Context *c, Window *w) { |
199 | assert(c); | |
200 | assert(w); | |
16e9f408 | 201 | |
f8019684 | 202 | if (c->window == w) |
16e9f408 LP |
203 | return; |
204 | ||
f8019684 | 205 | context_detach_window(c); |
16e9f408 | 206 | |
e18021f7 | 207 | if (w->in_unused) { |
f8019684 | 208 | /* Used again? */ |
71fda00f | 209 | LIST_REMOVE(unused, c->cache->unused, w); |
a2ab7ee6 CG |
210 | if (c->cache->last_unused == w) |
211 | c->cache->last_unused = w->unused_prev; | |
16e9f408 | 212 | |
f8019684 LP |
213 | w->in_unused = false; |
214 | } | |
f65425cb | 215 | |
f8019684 | 216 | c->window = w; |
71fda00f | 217 | LIST_PREPEND(by_window, w->contexts, c); |
16e9f408 LP |
218 | } |
219 | ||
f8019684 LP |
220 | static Context *context_add(MMapCache *m, unsigned id) { |
221 | Context *c; | |
222 | int r; | |
16e9f408 LP |
223 | |
224 | assert(m); | |
225 | ||
f8019684 LP |
226 | c = hashmap_get(m->contexts, UINT_TO_PTR(id + 1)); |
227 | if (c) | |
228 | return c; | |
229 | ||
230 | r = hashmap_ensure_allocated(&m->contexts, trivial_hash_func, trivial_compare_func); | |
231 | if (r < 0) | |
232 | return NULL; | |
233 | ||
234 | c = new0(Context, 1); | |
235 | if (!c) | |
236 | return NULL; | |
16e9f408 | 237 | |
f8019684 LP |
238 | c->cache = m; |
239 | c->id = id; | |
16e9f408 | 240 | |
f8019684 LP |
241 | r = hashmap_put(m->contexts, UINT_TO_PTR(id + 1), c); |
242 | if (r < 0) { | |
243 | free(c); | |
244 | return NULL; | |
16e9f408 LP |
245 | } |
246 | ||
f8019684 | 247 | return c; |
16e9f408 LP |
248 | } |
249 | ||
f8019684 LP |
250 | static void context_free(Context *c) { |
251 | assert(c); | |
16e9f408 | 252 | |
f8019684 | 253 | context_detach_window(c); |
16e9f408 | 254 | |
f8019684 LP |
255 | if (c->cache) |
256 | assert_se(hashmap_remove(c->cache->contexts, UINT_TO_PTR(c->id + 1))); | |
16e9f408 | 257 | |
f8019684 LP |
258 | free(c); |
259 | } | |
260 | ||
261 | static void fd_free(FileDescriptor *f) { | |
262 | assert(f); | |
263 | ||
264 | while (f->windows) | |
265 | window_free(f->windows); | |
266 | ||
267 | if (f->cache) | |
268 | assert_se(hashmap_remove(f->cache->fds, INT_TO_PTR(f->fd + 1))); | |
269 | ||
270 | free(f); | |
271 | } | |
272 | ||
273 | static FileDescriptor* fd_add(MMapCache *m, int fd) { | |
274 | FileDescriptor *f; | |
275 | int r; | |
276 | ||
277 | assert(m); | |
278 | assert(fd >= 0); | |
279 | ||
280 | f = hashmap_get(m->fds, INT_TO_PTR(fd + 1)); | |
281 | if (f) | |
282 | return f; | |
283 | ||
284 | r = hashmap_ensure_allocated(&m->fds, trivial_hash_func, trivial_compare_func); | |
285 | if (r < 0) | |
16e9f408 | 286 | return NULL; |
16e9f408 | 287 | |
f8019684 LP |
288 | f = new0(FileDescriptor, 1); |
289 | if (!f) | |
16e9f408 | 290 | return NULL; |
16e9f408 | 291 | |
f8019684 LP |
292 | f->cache = m; |
293 | f->fd = fd; | |
294 | ||
295 | r = hashmap_put(m->fds, UINT_TO_PTR(fd + 1), f); | |
296 | if (r < 0) { | |
297 | free(f); | |
16e9f408 LP |
298 | return NULL; |
299 | } | |
300 | ||
f8019684 | 301 | return f; |
16e9f408 LP |
302 | } |
303 | ||
f8019684 LP |
304 | static void mmap_cache_free(MMapCache *m) { |
305 | Context *c; | |
306 | FileDescriptor *f; | |
307 | ||
16e9f408 | 308 | assert(m); |
16e9f408 | 309 | |
f8019684 LP |
310 | while ((c = hashmap_first(m->contexts))) |
311 | context_free(c); | |
312 | ||
8e6d9397 GM |
313 | hashmap_free(m->contexts); |
314 | ||
f8019684 LP |
315 | while ((f = hashmap_first(m->fds))) |
316 | fd_free(f); | |
317 | ||
8e6d9397 GM |
318 | hashmap_free(m->fds); |
319 | ||
f8019684 LP |
320 | while (m->unused) |
321 | window_free(m->unused); | |
322 | ||
323 | free(m); | |
16e9f408 LP |
324 | } |
325 | ||
326 | MMapCache* mmap_cache_unref(MMapCache *m) { | |
327 | assert(m); | |
328 | assert(m->n_ref > 0); | |
329 | ||
f8019684 LP |
330 | m->n_ref --; |
331 | if (m->n_ref == 0) | |
16e9f408 | 332 | mmap_cache_free(m); |
16e9f408 LP |
333 | |
334 | return NULL; | |
335 | } | |
336 | ||
f8019684 LP |
337 | static int make_room(MMapCache *m) { |
338 | assert(m); | |
339 | ||
340 | if (!m->last_unused) | |
341 | return 0; | |
342 | ||
343 | window_free(m->last_unused); | |
344 | return 1; | |
345 | } | |
346 | ||
347 | static int try_context( | |
348 | MMapCache *m, | |
349 | int fd, | |
350 | int prot, | |
351 | unsigned context, | |
352 | bool keep_always, | |
353 | uint64_t offset, | |
354 | size_t size, | |
355 | void **ret) { | |
356 | ||
357 | Context *c; | |
f65425cb | 358 | |
16e9f408 | 359 | assert(m); |
f8019684 LP |
360 | assert(m->n_ref > 0); |
361 | assert(fd >= 0); | |
362 | assert(size > 0); | |
16e9f408 | 363 | |
f8019684 LP |
364 | c = hashmap_get(m->contexts, UINT_TO_PTR(context+1)); |
365 | if (!c) | |
16e9f408 | 366 | return 0; |
16e9f408 | 367 | |
f8019684 | 368 | assert(c->id == context); |
16e9f408 | 369 | |
f8019684 LP |
370 | if (!c->window) |
371 | return 0; | |
f65425cb | 372 | |
f8019684 | 373 | if (!window_matches(c->window, fd, prot, offset, size)) { |
f65425cb | 374 | |
f8019684 LP |
375 | /* Drop the reference to the window, since it's unnecessary now */ |
376 | context_detach_window(c); | |
377 | return 0; | |
f65425cb LP |
378 | } |
379 | ||
ae97089d | 380 | c->window->keep_always += keep_always; |
16e9f408 | 381 | |
ae97089d ZJS |
382 | if (ret) |
383 | *ret = (uint8_t*) c->window->ptr + (offset - c->window->offset); | |
f8019684 | 384 | return 1; |
16e9f408 LP |
385 | } |
386 | ||
f8019684 LP |
387 | static int find_mmap( |
388 | MMapCache *m, | |
389 | int fd, | |
390 | int prot, | |
391 | unsigned context, | |
392 | bool keep_always, | |
393 | uint64_t offset, | |
394 | size_t size, | |
395 | void **ret) { | |
396 | ||
397 | FileDescriptor *f; | |
398 | Window *w; | |
399 | Context *c; | |
16e9f408 LP |
400 | |
401 | assert(m); | |
f8019684 LP |
402 | assert(m->n_ref > 0); |
403 | assert(fd >= 0); | |
404 | assert(size > 0); | |
16e9f408 | 405 | |
f8019684 LP |
406 | f = hashmap_get(m->fds, INT_TO_PTR(fd + 1)); |
407 | if (!f) | |
408 | return 0; | |
16e9f408 | 409 | |
f8019684 | 410 | assert(f->fd == fd); |
16e9f408 | 411 | |
f8019684 LP |
412 | LIST_FOREACH(by_fd, w, f->windows) |
413 | if (window_matches(w, fd, prot, offset, size)) | |
414 | break; | |
16e9f408 | 415 | |
f8019684 LP |
416 | if (!w) |
417 | return 0; | |
418 | ||
419 | c = context_add(m, context); | |
420 | if (!c) | |
421 | return -ENOMEM; | |
422 | ||
423 | context_attach_window(c, w); | |
ae97089d | 424 | w->keep_always += keep_always; |
16e9f408 | 425 | |
ae97089d ZJS |
426 | if (ret) |
427 | *ret = (uint8_t*) w->ptr + (offset - w->offset); | |
f8019684 | 428 | return 1; |
16e9f408 LP |
429 | } |
430 | ||
f8019684 | 431 | static int add_mmap( |
16e9f408 LP |
432 | MMapCache *m, |
433 | int fd, | |
16e9f408 LP |
434 | int prot, |
435 | unsigned context, | |
fcde2389 | 436 | bool keep_always, |
16e9f408 | 437 | uint64_t offset, |
f8019684 | 438 | size_t size, |
fcde2389 | 439 | struct stat *st, |
16e9f408 LP |
440 | void **ret) { |
441 | ||
16e9f408 | 442 | uint64_t woffset, wsize; |
f8019684 LP |
443 | Context *c; |
444 | FileDescriptor *f; | |
445 | Window *w; | |
446 | void *d; | |
16e9f408 LP |
447 | int r; |
448 | ||
449 | assert(m); | |
f8019684 | 450 | assert(m->n_ref > 0); |
16e9f408 | 451 | assert(fd >= 0); |
16e9f408 | 452 | assert(size > 0); |
16e9f408 LP |
453 | |
454 | woffset = offset & ~((uint64_t) page_size() - 1ULL); | |
455 | wsize = size + (offset - woffset); | |
456 | wsize = PAGE_ALIGN(wsize); | |
457 | ||
458 | if (wsize < WINDOW_SIZE) { | |
459 | uint64_t delta; | |
460 | ||
beec0085 | 461 | delta = PAGE_ALIGN((WINDOW_SIZE - wsize) / 2); |
16e9f408 LP |
462 | |
463 | if (delta > offset) | |
464 | woffset = 0; | |
465 | else | |
466 | woffset -= delta; | |
467 | ||
468 | wsize = WINDOW_SIZE; | |
469 | } | |
470 | ||
fcde2389 LP |
471 | if (st) { |
472 | /* Memory maps that are larger then the files | |
c5315881 | 473 | underneath have undefined behavior. Hence, clamp |
fcde2389 LP |
474 | things to the file size if we know it */ |
475 | ||
476 | if (woffset >= (uint64_t) st->st_size) | |
477 | return -EADDRNOTAVAIL; | |
478 | ||
479 | if (woffset + wsize > (uint64_t) st->st_size) | |
480 | wsize = PAGE_ALIGN(st->st_size - woffset); | |
481 | } | |
482 | ||
16e9f408 LP |
483 | for (;;) { |
484 | d = mmap(NULL, wsize, prot, MAP_SHARED, fd, woffset); | |
485 | if (d != MAP_FAILED) | |
486 | break; | |
487 | if (errno != ENOMEM) | |
488 | return -errno; | |
489 | ||
f8019684 | 490 | r = make_room(m); |
16e9f408 LP |
491 | if (r < 0) |
492 | return r; | |
493 | if (r == 0) | |
494 | return -ENOMEM; | |
495 | } | |
496 | ||
f8019684 LP |
497 | c = context_add(m, context); |
498 | if (!c) | |
499 | return -ENOMEM; | |
16e9f408 | 500 | |
f8019684 LP |
501 | f = fd_add(m, fd); |
502 | if (!f) | |
503 | return -ENOMEM; | |
16e9f408 | 504 | |
f8019684 LP |
505 | w = window_add(m); |
506 | if (!w) | |
507 | return -ENOMEM; | |
16e9f408 | 508 | |
f8019684 LP |
509 | w->keep_always = keep_always; |
510 | w->ptr = d; | |
511 | w->offset = woffset; | |
512 | w->prot = prot; | |
513 | w->size = wsize; | |
514 | w->fd = f; | |
16e9f408 | 515 | |
71fda00f | 516 | LIST_PREPEND(by_fd, f->windows, w); |
16e9f408 | 517 | |
f8019684 LP |
518 | context_detach_window(c); |
519 | c->window = w; | |
71fda00f | 520 | LIST_PREPEND(by_window, w->contexts, c); |
16e9f408 | 521 | |
ae97089d ZJS |
522 | if (ret) |
523 | *ret = (uint8_t*) w->ptr + (offset - w->offset); | |
16e9f408 LP |
524 | return 1; |
525 | } | |
526 | ||
527 | int mmap_cache_get( | |
528 | MMapCache *m, | |
529 | int fd, | |
530 | int prot, | |
531 | unsigned context, | |
fcde2389 | 532 | bool keep_always, |
16e9f408 | 533 | uint64_t offset, |
f8019684 | 534 | size_t size, |
fcde2389 | 535 | struct stat *st, |
16e9f408 LP |
536 | void **ret) { |
537 | ||
16e9f408 LP |
538 | int r; |
539 | ||
540 | assert(m); | |
f8019684 | 541 | assert(m->n_ref > 0); |
16e9f408 | 542 | assert(fd >= 0); |
16e9f408 | 543 | assert(size > 0); |
16e9f408 | 544 | |
f8019684 LP |
545 | /* Check whether the current context is the right one already */ |
546 | r = try_context(m, fd, prot, context, keep_always, offset, size, ret); | |
bf807d4d LP |
547 | if (r != 0) { |
548 | m->n_hit ++; | |
16e9f408 | 549 | return r; |
bf807d4d | 550 | } |
16e9f408 | 551 | |
f8019684 LP |
552 | /* Search for a matching mmap */ |
553 | r = find_mmap(m, fd, prot, context, keep_always, offset, size, ret); | |
bf807d4d LP |
554 | if (r != 0) { |
555 | m->n_hit ++; | |
16e9f408 | 556 | return r; |
bf807d4d LP |
557 | } |
558 | ||
559 | m->n_missed++; | |
16e9f408 | 560 | |
f8019684 LP |
561 | /* Create a new mmap */ |
562 | return add_mmap(m, fd, prot, context, keep_always, offset, size, st, ret); | |
16e9f408 LP |
563 | } |
564 | ||
ae97089d ZJS |
565 | int mmap_cache_release( |
566 | MMapCache *m, | |
567 | int fd, | |
568 | int prot, | |
569 | unsigned context, | |
570 | uint64_t offset, | |
571 | size_t size) { | |
572 | ||
573 | FileDescriptor *f; | |
574 | Window *w; | |
575 | ||
576 | assert(m); | |
577 | assert(m->n_ref > 0); | |
578 | assert(fd >= 0); | |
579 | assert(size > 0); | |
580 | ||
581 | f = hashmap_get(m->fds, INT_TO_PTR(fd + 1)); | |
582 | if (!f) | |
583 | return -EBADF; | |
584 | ||
585 | assert(f->fd == fd); | |
586 | ||
587 | LIST_FOREACH(by_fd, w, f->windows) | |
588 | if (window_matches(w, fd, prot, offset, size)) | |
589 | break; | |
590 | ||
591 | if (!w) | |
592 | return -ENOENT; | |
593 | ||
594 | if (w->keep_always == 0) | |
595 | return -ENOLCK; | |
596 | ||
597 | w->keep_always -= 1; | |
598 | return 0; | |
599 | } | |
600 | ||
16e9f408 | 601 | void mmap_cache_close_fd(MMapCache *m, int fd) { |
f8019684 | 602 | FileDescriptor *f; |
16e9f408 LP |
603 | |
604 | assert(m); | |
f8019684 | 605 | assert(fd >= 0); |
16e9f408 | 606 | |
f8019684 LP |
607 | f = hashmap_get(m->fds, INT_TO_PTR(fd + 1)); |
608 | if (!f) | |
16e9f408 | 609 | return; |
16e9f408 | 610 | |
f8019684 LP |
611 | fd_free(f); |
612 | } | |
16e9f408 | 613 | |
f8019684 LP |
614 | void mmap_cache_close_context(MMapCache *m, unsigned context) { |
615 | Context *c; | |
16e9f408 | 616 | |
f8019684 | 617 | assert(m); |
16e9f408 | 618 | |
f8019684 LP |
619 | c = hashmap_get(m->contexts, UINT_TO_PTR(context + 1)); |
620 | if (!c) | |
621 | return; | |
16e9f408 | 622 | |
f8019684 | 623 | context_free(c); |
16e9f408 | 624 | } |
bf807d4d LP |
625 | |
626 | unsigned mmap_cache_get_hit(MMapCache *m) { | |
627 | assert(m); | |
628 | ||
629 | return m->n_hit; | |
630 | } | |
631 | ||
632 | unsigned mmap_cache_get_missed(MMapCache *m) { | |
633 | assert(m); | |
634 | ||
635 | return m->n_missed; | |
636 | } |