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Commit | Line | Data |
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4f39cd82 | 1 | #include "cache.h" |
6d6a80e0 | 2 | #include "mru.h" |
0317f455 | 3 | #include "pack.h" |
4f39cd82 JT |
4 | |
5 | char *odb_pack_name(struct strbuf *buf, | |
6 | const unsigned char *sha1, | |
7 | const char *ext) | |
8 | { | |
9 | strbuf_reset(buf); | |
10 | strbuf_addf(buf, "%s/pack/pack-%s.%s", get_object_directory(), | |
11 | sha1_to_hex(sha1), ext); | |
12 | return buf->buf; | |
13 | } | |
14 | ||
15 | char *sha1_pack_name(const unsigned char *sha1) | |
16 | { | |
17 | static struct strbuf buf = STRBUF_INIT; | |
18 | return odb_pack_name(&buf, sha1, "pack"); | |
19 | } | |
20 | ||
21 | char *sha1_pack_index_name(const unsigned char *sha1) | |
22 | { | |
23 | static struct strbuf buf = STRBUF_INIT; | |
24 | return odb_pack_name(&buf, sha1, "idx"); | |
25 | } | |
6d6a80e0 | 26 | |
84f80ad5 JT |
27 | static unsigned int pack_used_ctr; |
28 | static unsigned int pack_mmap_calls; | |
29 | static unsigned int peak_pack_open_windows; | |
30 | static unsigned int pack_open_windows; | |
6d6a80e0 | 31 | unsigned int pack_open_fds; |
84f80ad5 JT |
32 | static unsigned int pack_max_fds; |
33 | static size_t peak_pack_mapped; | |
34 | static size_t pack_mapped; | |
6d6a80e0 JT |
35 | struct packed_git *packed_git; |
36 | ||
37 | static struct mru packed_git_mru_storage; | |
38 | struct mru *packed_git_mru = &packed_git_mru_storage; | |
8e21176c JT |
39 | |
40 | #define SZ_FMT PRIuMAX | |
41 | static inline uintmax_t sz_fmt(size_t s) { return s; } | |
42 | ||
43 | void pack_report(void) | |
44 | { | |
45 | fprintf(stderr, | |
46 | "pack_report: getpagesize() = %10" SZ_FMT "\n" | |
47 | "pack_report: core.packedGitWindowSize = %10" SZ_FMT "\n" | |
48 | "pack_report: core.packedGitLimit = %10" SZ_FMT "\n", | |
49 | sz_fmt(getpagesize()), | |
50 | sz_fmt(packed_git_window_size), | |
51 | sz_fmt(packed_git_limit)); | |
52 | fprintf(stderr, | |
53 | "pack_report: pack_used_ctr = %10u\n" | |
54 | "pack_report: pack_mmap_calls = %10u\n" | |
55 | "pack_report: pack_open_windows = %10u / %10u\n" | |
56 | "pack_report: pack_mapped = " | |
57 | "%10" SZ_FMT " / %10" SZ_FMT "\n", | |
58 | pack_used_ctr, | |
59 | pack_mmap_calls, | |
60 | pack_open_windows, peak_pack_open_windows, | |
61 | sz_fmt(pack_mapped), sz_fmt(peak_pack_mapped)); | |
62 | } | |
0317f455 JT |
63 | |
64 | /* | |
65 | * Open and mmap the index file at path, perform a couple of | |
66 | * consistency checks, then record its information to p. Return 0 on | |
67 | * success. | |
68 | */ | |
69 | static int check_packed_git_idx(const char *path, struct packed_git *p) | |
70 | { | |
71 | void *idx_map; | |
72 | struct pack_idx_header *hdr; | |
73 | size_t idx_size; | |
74 | uint32_t version, nr, i, *index; | |
75 | int fd = git_open(path); | |
76 | struct stat st; | |
77 | ||
78 | if (fd < 0) | |
79 | return -1; | |
80 | if (fstat(fd, &st)) { | |
81 | close(fd); | |
82 | return -1; | |
83 | } | |
84 | idx_size = xsize_t(st.st_size); | |
85 | if (idx_size < 4 * 256 + 20 + 20) { | |
86 | close(fd); | |
87 | return error("index file %s is too small", path); | |
88 | } | |
89 | idx_map = xmmap(NULL, idx_size, PROT_READ, MAP_PRIVATE, fd, 0); | |
90 | close(fd); | |
91 | ||
92 | hdr = idx_map; | |
93 | if (hdr->idx_signature == htonl(PACK_IDX_SIGNATURE)) { | |
94 | version = ntohl(hdr->idx_version); | |
95 | if (version < 2 || version > 2) { | |
96 | munmap(idx_map, idx_size); | |
97 | return error("index file %s is version %"PRIu32 | |
98 | " and is not supported by this binary" | |
99 | " (try upgrading GIT to a newer version)", | |
100 | path, version); | |
101 | } | |
102 | } else | |
103 | version = 1; | |
104 | ||
105 | nr = 0; | |
106 | index = idx_map; | |
107 | if (version > 1) | |
108 | index += 2; /* skip index header */ | |
109 | for (i = 0; i < 256; i++) { | |
110 | uint32_t n = ntohl(index[i]); | |
111 | if (n < nr) { | |
112 | munmap(idx_map, idx_size); | |
113 | return error("non-monotonic index %s", path); | |
114 | } | |
115 | nr = n; | |
116 | } | |
117 | ||
118 | if (version == 1) { | |
119 | /* | |
120 | * Total size: | |
121 | * - 256 index entries 4 bytes each | |
122 | * - 24-byte entries * nr (20-byte sha1 + 4-byte offset) | |
123 | * - 20-byte SHA1 of the packfile | |
124 | * - 20-byte SHA1 file checksum | |
125 | */ | |
126 | if (idx_size != 4*256 + nr * 24 + 20 + 20) { | |
127 | munmap(idx_map, idx_size); | |
128 | return error("wrong index v1 file size in %s", path); | |
129 | } | |
130 | } else if (version == 2) { | |
131 | /* | |
132 | * Minimum size: | |
133 | * - 8 bytes of header | |
134 | * - 256 index entries 4 bytes each | |
135 | * - 20-byte sha1 entry * nr | |
136 | * - 4-byte crc entry * nr | |
137 | * - 4-byte offset entry * nr | |
138 | * - 20-byte SHA1 of the packfile | |
139 | * - 20-byte SHA1 file checksum | |
140 | * And after the 4-byte offset table might be a | |
141 | * variable sized table containing 8-byte entries | |
142 | * for offsets larger than 2^31. | |
143 | */ | |
144 | unsigned long min_size = 8 + 4*256 + nr*(20 + 4 + 4) + 20 + 20; | |
145 | unsigned long max_size = min_size; | |
146 | if (nr) | |
147 | max_size += (nr - 1)*8; | |
148 | if (idx_size < min_size || idx_size > max_size) { | |
149 | munmap(idx_map, idx_size); | |
150 | return error("wrong index v2 file size in %s", path); | |
151 | } | |
152 | if (idx_size != min_size && | |
153 | /* | |
154 | * make sure we can deal with large pack offsets. | |
155 | * 31-bit signed offset won't be enough, neither | |
156 | * 32-bit unsigned one will be. | |
157 | */ | |
158 | (sizeof(off_t) <= 4)) { | |
159 | munmap(idx_map, idx_size); | |
160 | return error("pack too large for current definition of off_t in %s", path); | |
161 | } | |
162 | } | |
163 | ||
164 | p->index_version = version; | |
165 | p->index_data = idx_map; | |
166 | p->index_size = idx_size; | |
167 | p->num_objects = nr; | |
168 | return 0; | |
169 | } | |
170 | ||
171 | int open_pack_index(struct packed_git *p) | |
172 | { | |
173 | char *idx_name; | |
174 | size_t len; | |
175 | int ret; | |
176 | ||
177 | if (p->index_data) | |
178 | return 0; | |
179 | ||
180 | if (!strip_suffix(p->pack_name, ".pack", &len)) | |
181 | die("BUG: pack_name does not end in .pack"); | |
182 | idx_name = xstrfmt("%.*s.idx", (int)len, p->pack_name); | |
183 | ret = check_packed_git_idx(idx_name, p); | |
184 | free(idx_name); | |
185 | return ret; | |
186 | } | |
187 | ||
188 | static struct packed_git *alloc_packed_git(int extra) | |
189 | { | |
190 | struct packed_git *p = xmalloc(st_add(sizeof(*p), extra)); | |
191 | memset(p, 0, sizeof(*p)); | |
192 | p->pack_fd = -1; | |
193 | return p; | |
194 | } | |
195 | ||
196 | struct packed_git *parse_pack_index(unsigned char *sha1, const char *idx_path) | |
197 | { | |
198 | const char *path = sha1_pack_name(sha1); | |
199 | size_t alloc = st_add(strlen(path), 1); | |
200 | struct packed_git *p = alloc_packed_git(alloc); | |
201 | ||
202 | memcpy(p->pack_name, path, alloc); /* includes NUL */ | |
203 | hashcpy(p->sha1, sha1); | |
204 | if (check_packed_git_idx(idx_path, p)) { | |
205 | free(p); | |
206 | return NULL; | |
207 | } | |
208 | ||
209 | return p; | |
210 | } | |
f0e17e86 JT |
211 | |
212 | static void scan_windows(struct packed_git *p, | |
213 | struct packed_git **lru_p, | |
214 | struct pack_window **lru_w, | |
215 | struct pack_window **lru_l) | |
216 | { | |
217 | struct pack_window *w, *w_l; | |
218 | ||
219 | for (w_l = NULL, w = p->windows; w; w = w->next) { | |
220 | if (!w->inuse_cnt) { | |
221 | if (!*lru_w || w->last_used < (*lru_w)->last_used) { | |
222 | *lru_p = p; | |
223 | *lru_w = w; | |
224 | *lru_l = w_l; | |
225 | } | |
226 | } | |
227 | w_l = w; | |
228 | } | |
229 | } | |
230 | ||
84f80ad5 | 231 | static int unuse_one_window(struct packed_git *current) |
f0e17e86 JT |
232 | { |
233 | struct packed_git *p, *lru_p = NULL; | |
234 | struct pack_window *lru_w = NULL, *lru_l = NULL; | |
235 | ||
236 | if (current) | |
237 | scan_windows(current, &lru_p, &lru_w, &lru_l); | |
238 | for (p = packed_git; p; p = p->next) | |
239 | scan_windows(p, &lru_p, &lru_w, &lru_l); | |
240 | if (lru_p) { | |
241 | munmap(lru_w->base, lru_w->len); | |
242 | pack_mapped -= lru_w->len; | |
243 | if (lru_l) | |
244 | lru_l->next = lru_w->next; | |
245 | else | |
246 | lru_p->windows = lru_w->next; | |
247 | free(lru_w); | |
248 | pack_open_windows--; | |
249 | return 1; | |
250 | } | |
251 | return 0; | |
252 | } | |
253 | ||
254 | void release_pack_memory(size_t need) | |
255 | { | |
256 | size_t cur = pack_mapped; | |
257 | while (need >= (cur - pack_mapped) && unuse_one_window(NULL)) | |
258 | ; /* nothing */ | |
259 | } | |
3836d88a JT |
260 | |
261 | void close_pack_windows(struct packed_git *p) | |
262 | { | |
263 | while (p->windows) { | |
264 | struct pack_window *w = p->windows; | |
265 | ||
266 | if (w->inuse_cnt) | |
267 | die("pack '%s' still has open windows to it", | |
268 | p->pack_name); | |
269 | munmap(w->base, w->len); | |
270 | pack_mapped -= w->len; | |
271 | pack_open_windows--; | |
272 | p->windows = w->next; | |
273 | free(w); | |
274 | } | |
275 | } | |
276 | ||
84f80ad5 | 277 | static int close_pack_fd(struct packed_git *p) |
3836d88a JT |
278 | { |
279 | if (p->pack_fd < 0) | |
280 | return 0; | |
281 | ||
282 | close(p->pack_fd); | |
283 | pack_open_fds--; | |
284 | p->pack_fd = -1; | |
285 | ||
286 | return 1; | |
287 | } | |
288 | ||
289 | void close_pack_index(struct packed_git *p) | |
290 | { | |
291 | if (p->index_data) { | |
292 | munmap((void *)p->index_data, p->index_size); | |
293 | p->index_data = NULL; | |
294 | } | |
295 | } | |
296 | ||
297 | static void close_pack(struct packed_git *p) | |
298 | { | |
299 | close_pack_windows(p); | |
300 | close_pack_fd(p); | |
301 | close_pack_index(p); | |
302 | } | |
303 | ||
304 | void close_all_packs(void) | |
305 | { | |
306 | struct packed_git *p; | |
307 | ||
308 | for (p = packed_git; p; p = p->next) | |
309 | if (p->do_not_close) | |
310 | die("BUG: want to close pack marked 'do-not-close'"); | |
311 | else | |
312 | close_pack(p); | |
313 | } | |
84f80ad5 JT |
314 | |
315 | /* | |
316 | * The LRU pack is the one with the oldest MRU window, preferring packs | |
317 | * with no used windows, or the oldest mtime if it has no windows allocated. | |
318 | */ | |
319 | static void find_lru_pack(struct packed_git *p, struct packed_git **lru_p, struct pack_window **mru_w, int *accept_windows_inuse) | |
320 | { | |
321 | struct pack_window *w, *this_mru_w; | |
322 | int has_windows_inuse = 0; | |
323 | ||
324 | /* | |
325 | * Reject this pack if it has windows and the previously selected | |
326 | * one does not. If this pack does not have windows, reject | |
327 | * it if the pack file is newer than the previously selected one. | |
328 | */ | |
329 | if (*lru_p && !*mru_w && (p->windows || p->mtime > (*lru_p)->mtime)) | |
330 | return; | |
331 | ||
332 | for (w = this_mru_w = p->windows; w; w = w->next) { | |
333 | /* | |
334 | * Reject this pack if any of its windows are in use, | |
335 | * but the previously selected pack did not have any | |
336 | * inuse windows. Otherwise, record that this pack | |
337 | * has windows in use. | |
338 | */ | |
339 | if (w->inuse_cnt) { | |
340 | if (*accept_windows_inuse) | |
341 | has_windows_inuse = 1; | |
342 | else | |
343 | return; | |
344 | } | |
345 | ||
346 | if (w->last_used > this_mru_w->last_used) | |
347 | this_mru_w = w; | |
348 | ||
349 | /* | |
350 | * Reject this pack if it has windows that have been | |
351 | * used more recently than the previously selected pack. | |
352 | * If the previously selected pack had windows inuse and | |
353 | * we have not encountered a window in this pack that is | |
354 | * inuse, skip this check since we prefer a pack with no | |
355 | * inuse windows to one that has inuse windows. | |
356 | */ | |
357 | if (*mru_w && *accept_windows_inuse == has_windows_inuse && | |
358 | this_mru_w->last_used > (*mru_w)->last_used) | |
359 | return; | |
360 | } | |
361 | ||
362 | /* | |
363 | * Select this pack. | |
364 | */ | |
365 | *mru_w = this_mru_w; | |
366 | *lru_p = p; | |
367 | *accept_windows_inuse = has_windows_inuse; | |
368 | } | |
369 | ||
370 | static int close_one_pack(void) | |
371 | { | |
372 | struct packed_git *p, *lru_p = NULL; | |
373 | struct pack_window *mru_w = NULL; | |
374 | int accept_windows_inuse = 1; | |
375 | ||
376 | for (p = packed_git; p; p = p->next) { | |
377 | if (p->pack_fd == -1) | |
378 | continue; | |
379 | find_lru_pack(p, &lru_p, &mru_w, &accept_windows_inuse); | |
380 | } | |
381 | ||
382 | if (lru_p) | |
383 | return close_pack_fd(lru_p); | |
384 | ||
385 | return 0; | |
386 | } | |
387 | ||
388 | static unsigned int get_max_fd_limit(void) | |
389 | { | |
390 | #ifdef RLIMIT_NOFILE | |
391 | { | |
392 | struct rlimit lim; | |
393 | ||
394 | if (!getrlimit(RLIMIT_NOFILE, &lim)) | |
395 | return lim.rlim_cur; | |
396 | } | |
397 | #endif | |
398 | ||
399 | #ifdef _SC_OPEN_MAX | |
400 | { | |
401 | long open_max = sysconf(_SC_OPEN_MAX); | |
402 | if (0 < open_max) | |
403 | return open_max; | |
404 | /* | |
405 | * Otherwise, we got -1 for one of the two | |
406 | * reasons: | |
407 | * | |
408 | * (1) sysconf() did not understand _SC_OPEN_MAX | |
409 | * and signaled an error with -1; or | |
410 | * (2) sysconf() said there is no limit. | |
411 | * | |
412 | * We _could_ clear errno before calling sysconf() to | |
413 | * tell these two cases apart and return a huge number | |
414 | * in the latter case to let the caller cap it to a | |
415 | * value that is not so selfish, but letting the | |
416 | * fallback OPEN_MAX codepath take care of these cases | |
417 | * is a lot simpler. | |
418 | */ | |
419 | } | |
420 | #endif | |
421 | ||
422 | #ifdef OPEN_MAX | |
423 | return OPEN_MAX; | |
424 | #else | |
425 | return 1; /* see the caller ;-) */ | |
426 | #endif | |
427 | } | |
428 | ||
429 | /* | |
430 | * Do not call this directly as this leaks p->pack_fd on error return; | |
431 | * call open_packed_git() instead. | |
432 | */ | |
433 | static int open_packed_git_1(struct packed_git *p) | |
434 | { | |
435 | struct stat st; | |
436 | struct pack_header hdr; | |
437 | unsigned char sha1[20]; | |
438 | unsigned char *idx_sha1; | |
439 | long fd_flag; | |
440 | ||
441 | if (!p->index_data && open_pack_index(p)) | |
442 | return error("packfile %s index unavailable", p->pack_name); | |
443 | ||
444 | if (!pack_max_fds) { | |
445 | unsigned int max_fds = get_max_fd_limit(); | |
446 | ||
447 | /* Save 3 for stdin/stdout/stderr, 22 for work */ | |
448 | if (25 < max_fds) | |
449 | pack_max_fds = max_fds - 25; | |
450 | else | |
451 | pack_max_fds = 1; | |
452 | } | |
453 | ||
454 | while (pack_max_fds <= pack_open_fds && close_one_pack()) | |
455 | ; /* nothing */ | |
456 | ||
457 | p->pack_fd = git_open(p->pack_name); | |
458 | if (p->pack_fd < 0 || fstat(p->pack_fd, &st)) | |
459 | return -1; | |
460 | pack_open_fds++; | |
461 | ||
462 | /* If we created the struct before we had the pack we lack size. */ | |
463 | if (!p->pack_size) { | |
464 | if (!S_ISREG(st.st_mode)) | |
465 | return error("packfile %s not a regular file", p->pack_name); | |
466 | p->pack_size = st.st_size; | |
467 | } else if (p->pack_size != st.st_size) | |
468 | return error("packfile %s size changed", p->pack_name); | |
469 | ||
470 | /* We leave these file descriptors open with sliding mmap; | |
471 | * there is no point keeping them open across exec(), though. | |
472 | */ | |
473 | fd_flag = fcntl(p->pack_fd, F_GETFD, 0); | |
474 | if (fd_flag < 0) | |
475 | return error("cannot determine file descriptor flags"); | |
476 | fd_flag |= FD_CLOEXEC; | |
477 | if (fcntl(p->pack_fd, F_SETFD, fd_flag) == -1) | |
478 | return error("cannot set FD_CLOEXEC"); | |
479 | ||
480 | /* Verify we recognize this pack file format. */ | |
481 | if (read_in_full(p->pack_fd, &hdr, sizeof(hdr)) != sizeof(hdr)) | |
482 | return error("file %s is far too short to be a packfile", p->pack_name); | |
483 | if (hdr.hdr_signature != htonl(PACK_SIGNATURE)) | |
484 | return error("file %s is not a GIT packfile", p->pack_name); | |
485 | if (!pack_version_ok(hdr.hdr_version)) | |
486 | return error("packfile %s is version %"PRIu32" and not" | |
487 | " supported (try upgrading GIT to a newer version)", | |
488 | p->pack_name, ntohl(hdr.hdr_version)); | |
489 | ||
490 | /* Verify the pack matches its index. */ | |
491 | if (p->num_objects != ntohl(hdr.hdr_entries)) | |
492 | return error("packfile %s claims to have %"PRIu32" objects" | |
493 | " while index indicates %"PRIu32" objects", | |
494 | p->pack_name, ntohl(hdr.hdr_entries), | |
495 | p->num_objects); | |
496 | if (lseek(p->pack_fd, p->pack_size - sizeof(sha1), SEEK_SET) == -1) | |
497 | return error("end of packfile %s is unavailable", p->pack_name); | |
498 | if (read_in_full(p->pack_fd, sha1, sizeof(sha1)) != sizeof(sha1)) | |
499 | return error("packfile %s signature is unavailable", p->pack_name); | |
500 | idx_sha1 = ((unsigned char *)p->index_data) + p->index_size - 40; | |
501 | if (hashcmp(sha1, idx_sha1)) | |
502 | return error("packfile %s does not match index", p->pack_name); | |
503 | return 0; | |
504 | } | |
505 | ||
506 | int open_packed_git(struct packed_git *p) | |
507 | { | |
508 | if (!open_packed_git_1(p)) | |
509 | return 0; | |
510 | close_pack_fd(p); | |
511 | return -1; | |
512 | } | |
513 | ||
514 | static int in_window(struct pack_window *win, off_t offset) | |
515 | { | |
516 | /* We must promise at least 20 bytes (one hash) after the | |
517 | * offset is available from this window, otherwise the offset | |
518 | * is not actually in this window and a different window (which | |
519 | * has that one hash excess) must be used. This is to support | |
520 | * the object header and delta base parsing routines below. | |
521 | */ | |
522 | off_t win_off = win->offset; | |
523 | return win_off <= offset | |
524 | && (offset + 20) <= (win_off + win->len); | |
525 | } | |
526 | ||
527 | unsigned char *use_pack(struct packed_git *p, | |
528 | struct pack_window **w_cursor, | |
529 | off_t offset, | |
530 | unsigned long *left) | |
531 | { | |
532 | struct pack_window *win = *w_cursor; | |
533 | ||
534 | /* Since packfiles end in a hash of their content and it's | |
535 | * pointless to ask for an offset into the middle of that | |
536 | * hash, and the in_window function above wouldn't match | |
537 | * don't allow an offset too close to the end of the file. | |
538 | */ | |
539 | if (!p->pack_size && p->pack_fd == -1 && open_packed_git(p)) | |
540 | die("packfile %s cannot be accessed", p->pack_name); | |
541 | if (offset > (p->pack_size - 20)) | |
542 | die("offset beyond end of packfile (truncated pack?)"); | |
543 | if (offset < 0) | |
544 | die(_("offset before end of packfile (broken .idx?)")); | |
545 | ||
546 | if (!win || !in_window(win, offset)) { | |
547 | if (win) | |
548 | win->inuse_cnt--; | |
549 | for (win = p->windows; win; win = win->next) { | |
550 | if (in_window(win, offset)) | |
551 | break; | |
552 | } | |
553 | if (!win) { | |
554 | size_t window_align = packed_git_window_size / 2; | |
555 | off_t len; | |
556 | ||
557 | if (p->pack_fd == -1 && open_packed_git(p)) | |
558 | die("packfile %s cannot be accessed", p->pack_name); | |
559 | ||
560 | win = xcalloc(1, sizeof(*win)); | |
561 | win->offset = (offset / window_align) * window_align; | |
562 | len = p->pack_size - win->offset; | |
563 | if (len > packed_git_window_size) | |
564 | len = packed_git_window_size; | |
565 | win->len = (size_t)len; | |
566 | pack_mapped += win->len; | |
567 | while (packed_git_limit < pack_mapped | |
568 | && unuse_one_window(p)) | |
569 | ; /* nothing */ | |
570 | win->base = xmmap(NULL, win->len, | |
571 | PROT_READ, MAP_PRIVATE, | |
572 | p->pack_fd, win->offset); | |
573 | if (win->base == MAP_FAILED) | |
574 | die_errno("packfile %s cannot be mapped", | |
575 | p->pack_name); | |
576 | if (!win->offset && win->len == p->pack_size | |
577 | && !p->do_not_close) | |
578 | close_pack_fd(p); | |
579 | pack_mmap_calls++; | |
580 | pack_open_windows++; | |
581 | if (pack_mapped > peak_pack_mapped) | |
582 | peak_pack_mapped = pack_mapped; | |
583 | if (pack_open_windows > peak_pack_open_windows) | |
584 | peak_pack_open_windows = pack_open_windows; | |
585 | win->next = p->windows; | |
586 | p->windows = win; | |
587 | } | |
588 | } | |
589 | if (win != *w_cursor) { | |
590 | win->last_used = pack_used_ctr++; | |
591 | win->inuse_cnt++; | |
592 | *w_cursor = win; | |
593 | } | |
594 | offset -= win->offset; | |
595 | if (left) | |
596 | *left = win->len - xsize_t(offset); | |
597 | return win->base + offset; | |
598 | } | |
97de1803 JT |
599 | |
600 | void unuse_pack(struct pack_window **w_cursor) | |
601 | { | |
602 | struct pack_window *w = *w_cursor; | |
603 | if (w) { | |
604 | w->inuse_cnt--; | |
605 | *w_cursor = NULL; | |
606 | } | |
607 | } |