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883e248b BP |
1 | #include "cache.h" |
2 | #include "config.h" | |
3 | #include "dir.h" | |
4 | #include "ewah/ewok.h" | |
5 | #include "fsmonitor.h" | |
1e0ea5c4 | 6 | #include "fsmonitor-ipc.h" |
883e248b BP |
7 | #include "run-command.h" |
8 | #include "strbuf.h" | |
9 | ||
56c69100 KW |
10 | #define INDEX_EXTENSION_VERSION1 (1) |
11 | #define INDEX_EXTENSION_VERSION2 (2) | |
8da2c576 KW |
12 | #define HOOK_INTERFACE_VERSION1 (1) |
13 | #define HOOK_INTERFACE_VERSION2 (2) | |
883e248b BP |
14 | |
15 | struct trace_key trace_fsmonitor = TRACE_KEY_INIT(FSMONITOR); | |
16 | ||
cae70acf DS |
17 | static void assert_index_minimum(struct index_state *istate, size_t pos) |
18 | { | |
19 | if (pos > istate->cache_nr) | |
20 | BUG("fsmonitor_dirty has more entries than the index (%"PRIuMAX" > %u)", | |
21 | (uintmax_t)pos, istate->cache_nr); | |
22 | } | |
23 | ||
883e248b BP |
24 | static void fsmonitor_ewah_callback(size_t pos, void *is) |
25 | { | |
26 | struct index_state *istate = (struct index_state *)is; | |
3444ec2e | 27 | struct cache_entry *ce; |
883e248b | 28 | |
cae70acf | 29 | assert_index_minimum(istate, pos + 1); |
3444ec2e WB |
30 | |
31 | ce = istate->cache[pos]; | |
883e248b BP |
32 | ce->ce_flags &= ~CE_FSMONITOR_VALID; |
33 | } | |
34 | ||
8da2c576 KW |
35 | static int fsmonitor_hook_version(void) |
36 | { | |
37 | int hook_version; | |
38 | ||
39 | if (git_config_get_int("core.fsmonitorhookversion", &hook_version)) | |
40 | return -1; | |
41 | ||
42 | if (hook_version == HOOK_INTERFACE_VERSION1 || | |
43 | hook_version == HOOK_INTERFACE_VERSION2) | |
44 | return hook_version; | |
45 | ||
46 | warning("Invalid hook version '%i' in core.fsmonitorhookversion. " | |
47 | "Must be 1 or 2.", hook_version); | |
48 | return -1; | |
49 | } | |
50 | ||
883e248b BP |
51 | int read_fsmonitor_extension(struct index_state *istate, const void *data, |
52 | unsigned long sz) | |
53 | { | |
54 | const char *index = data; | |
55 | uint32_t hdr_version; | |
56 | uint32_t ewah_size; | |
57 | struct ewah_bitmap *fsmonitor_dirty; | |
883e248b | 58 | int ret; |
56c69100 KW |
59 | uint64_t timestamp; |
60 | struct strbuf last_update = STRBUF_INIT; | |
883e248b | 61 | |
56c69100 | 62 | if (sz < sizeof(uint32_t) + 1 + sizeof(uint32_t)) |
883e248b BP |
63 | return error("corrupt fsmonitor extension (too short)"); |
64 | ||
65 | hdr_version = get_be32(index); | |
66 | index += sizeof(uint32_t); | |
56c69100 KW |
67 | if (hdr_version == INDEX_EXTENSION_VERSION1) { |
68 | timestamp = get_be64(index); | |
69 | strbuf_addf(&last_update, "%"PRIu64"", timestamp); | |
70 | index += sizeof(uint64_t); | |
71 | } else if (hdr_version == INDEX_EXTENSION_VERSION2) { | |
72 | strbuf_addstr(&last_update, index); | |
73 | index += last_update.len + 1; | |
74 | } else { | |
883e248b | 75 | return error("bad fsmonitor version %d", hdr_version); |
56c69100 | 76 | } |
883e248b | 77 | |
56c69100 | 78 | istate->fsmonitor_last_update = strbuf_detach(&last_update, NULL); |
883e248b BP |
79 | |
80 | ewah_size = get_be32(index); | |
81 | index += sizeof(uint32_t); | |
82 | ||
83 | fsmonitor_dirty = ewah_new(); | |
84 | ret = ewah_read_mmap(fsmonitor_dirty, index, ewah_size); | |
85 | if (ret != ewah_size) { | |
86 | ewah_free(fsmonitor_dirty); | |
87 | return error("failed to parse ewah bitmap reading fsmonitor index extension"); | |
88 | } | |
ba1b9cac | 89 | istate->fsmonitor_dirty = fsmonitor_dirty; |
883e248b | 90 | |
cae70acf DS |
91 | if (!istate->split_index) |
92 | assert_index_minimum(istate, istate->fsmonitor_dirty->bit_size); | |
3444ec2e | 93 | |
29fbbf43 JH |
94 | trace2_data_string("index", NULL, "extension/fsmn/read/token", |
95 | istate->fsmonitor_last_update); | |
96 | trace_printf_key(&trace_fsmonitor, | |
97 | "read fsmonitor extension successful '%s'", | |
98 | istate->fsmonitor_last_update); | |
883e248b BP |
99 | return 0; |
100 | } | |
101 | ||
3bd28eb2 AV |
102 | void fill_fsmonitor_bitmap(struct index_state *istate) |
103 | { | |
3444ec2e | 104 | unsigned int i, skipped = 0; |
3bd28eb2 | 105 | istate->fsmonitor_dirty = ewah_new(); |
3444ec2e WB |
106 | for (i = 0; i < istate->cache_nr; i++) { |
107 | if (istate->cache[i]->ce_flags & CE_REMOVE) | |
108 | skipped++; | |
109 | else if (!(istate->cache[i]->ce_flags & CE_FSMONITOR_VALID)) | |
110 | ewah_set(istate->fsmonitor_dirty, i - skipped); | |
111 | } | |
3bd28eb2 AV |
112 | } |
113 | ||
883e248b BP |
114 | void write_fsmonitor_extension(struct strbuf *sb, struct index_state *istate) |
115 | { | |
116 | uint32_t hdr_version; | |
883e248b BP |
117 | uint32_t ewah_start; |
118 | uint32_t ewah_size = 0; | |
119 | int fixup = 0; | |
120 | ||
cae70acf DS |
121 | if (!istate->split_index) |
122 | assert_index_minimum(istate, istate->fsmonitor_dirty->bit_size); | |
3444ec2e | 123 | |
56c69100 | 124 | put_be32(&hdr_version, INDEX_EXTENSION_VERSION2); |
883e248b BP |
125 | strbuf_add(sb, &hdr_version, sizeof(uint32_t)); |
126 | ||
56c69100 KW |
127 | strbuf_addstr(sb, istate->fsmonitor_last_update); |
128 | strbuf_addch(sb, 0); /* Want to keep a NUL */ | |
129 | ||
883e248b BP |
130 | fixup = sb->len; |
131 | strbuf_add(sb, &ewah_size, sizeof(uint32_t)); /* we'll fix this up later */ | |
132 | ||
133 | ewah_start = sb->len; | |
3bd28eb2 AV |
134 | ewah_serialize_strbuf(istate->fsmonitor_dirty, sb); |
135 | ewah_free(istate->fsmonitor_dirty); | |
136 | istate->fsmonitor_dirty = NULL; | |
883e248b BP |
137 | |
138 | /* fix up size field */ | |
139 | put_be32(&ewah_size, sb->len - ewah_start); | |
140 | memcpy(sb->buf + fixup, &ewah_size, sizeof(uint32_t)); | |
141 | ||
29fbbf43 JH |
142 | trace2_data_string("index", NULL, "extension/fsmn/write/token", |
143 | istate->fsmonitor_last_update); | |
144 | trace_printf_key(&trace_fsmonitor, | |
145 | "write fsmonitor extension successful '%s'", | |
146 | istate->fsmonitor_last_update); | |
883e248b BP |
147 | } |
148 | ||
149 | /* | |
56c69100 | 150 | * Call the query-fsmonitor hook passing the last update token of the saved results. |
883e248b | 151 | */ |
1e0ea5c4 JH |
152 | static int query_fsmonitor_hook(struct repository *r, |
153 | int version, | |
154 | const char *last_update, | |
155 | struct strbuf *query_result) | |
883e248b BP |
156 | { |
157 | struct child_process cp = CHILD_PROCESS_INIT; | |
940b94f3 | 158 | int result; |
883e248b | 159 | |
1e0ea5c4 | 160 | if (fsm_settings__get_mode(r) != FSMONITOR_MODE_HOOK) |
883e248b BP |
161 | return -1; |
162 | ||
1e0ea5c4 | 163 | strvec_push(&cp.args, fsm_settings__get_hook_path(r)); |
ef8d7ac4 JK |
164 | strvec_pushf(&cp.args, "%d", version); |
165 | strvec_pushf(&cp.args, "%s", last_update); | |
883e248b | 166 | cp.use_shell = 1; |
11cf33be | 167 | cp.dir = get_git_work_tree(); |
883e248b | 168 | |
940b94f3 JH |
169 | trace2_region_enter("fsm_hook", "query", NULL); |
170 | ||
171 | result = capture_command(&cp, query_result, 1024); | |
172 | ||
173 | if (result) | |
174 | trace2_data_intmax("fsm_hook", NULL, "query/failed", result); | |
974c1b39 | 175 | else |
940b94f3 JH |
176 | trace2_data_intmax("fsm_hook", NULL, "query/response-length", |
177 | query_result->len); | |
178 | ||
940b94f3 JH |
179 | trace2_region_leave("fsm_hook", "query", NULL); |
180 | ||
181 | return result; | |
883e248b BP |
182 | } |
183 | ||
ff03836b | 184 | static void fsmonitor_refresh_callback(struct index_state *istate, char *name) |
883e248b | 185 | { |
ff03836b | 186 | int i, len = strlen(name); |
95a4e78a JH |
187 | int pos = index_name_pos(istate, name, len); |
188 | ||
189 | trace_printf_key(&trace_fsmonitor, | |
190 | "fsmonitor_refresh_callback '%s' (pos %d)", | |
191 | name, pos); | |
ff03836b | 192 | |
95a4e78a | 193 | if (name[len - 1] == '/') { |
ff03836b | 194 | /* |
95a4e78a JH |
195 | * The daemon can decorate directory events, such as |
196 | * moves or renames, with a trailing slash if the OS | |
197 | * FS Event contains sufficient information, such as | |
198 | * MacOS. | |
199 | * | |
200 | * Use this to invalidate the entire cone under that | |
201 | * directory. | |
202 | * | |
203 | * We do not expect an exact match because the index | |
204 | * does not normally contain directory entries, so we | |
205 | * start at the insertion point and scan. | |
ff03836b | 206 | */ |
95a4e78a JH |
207 | if (pos < 0) |
208 | pos = -pos - 1; | |
ff03836b KW |
209 | |
210 | /* Mark all entries for the folder invalid */ | |
95a4e78a JH |
211 | for (i = pos; i < istate->cache_nr; i++) { |
212 | if (!starts_with(istate->cache[i]->name, name)) | |
213 | break; | |
214 | istate->cache[i]->ce_flags &= ~CE_FSMONITOR_VALID; | |
ff03836b | 215 | } |
95a4e78a JH |
216 | |
217 | /* | |
218 | * We need to remove the traling "/" from the path | |
219 | * for the untracked cache. | |
220 | */ | |
ff03836b | 221 | name[len - 1] = '\0'; |
95a4e78a JH |
222 | } else if (pos >= 0) { |
223 | /* | |
224 | * We have an exact match for this path and can just | |
225 | * invalidate it. | |
226 | */ | |
227 | istate->cache[pos]->ce_flags &= ~CE_FSMONITOR_VALID; | |
ff03836b | 228 | } else { |
95a4e78a JH |
229 | /* |
230 | * The path is not a tracked file -or- it is a | |
231 | * directory event on a platform that cannot | |
232 | * distinguish between file and directory events in | |
233 | * the event handler, such as Windows. | |
234 | * | |
235 | * Scan as if it is a directory and invalidate the | |
236 | * cone under it. (But remember to ignore items | |
237 | * between "name" and "name/", such as "name-" and | |
238 | * "name.". | |
239 | */ | |
240 | pos = -pos - 1; | |
241 | ||
242 | for (i = pos; i < istate->cache_nr; i++) { | |
243 | if (!starts_with(istate->cache[i]->name, name)) | |
244 | break; | |
245 | if ((unsigned char)istate->cache[i]->name[len] > '/') | |
246 | break; | |
247 | if (istate->cache[i]->name[len] == '/') | |
248 | istate->cache[i]->ce_flags &= ~CE_FSMONITOR_VALID; | |
ff03836b | 249 | } |
883e248b BP |
250 | } |
251 | ||
252 | /* | |
253 | * Mark the untracked cache dirty even if it wasn't found in the index | |
254 | * as it could be a new untracked file. | |
255 | */ | |
0cacebf0 | 256 | untracked_cache_invalidate_path(istate, name, 0); |
883e248b BP |
257 | } |
258 | ||
26b9f34a JH |
259 | /* |
260 | * The number of pathnames that we need to receive from FSMonitor | |
261 | * before we force the index to be updated. | |
262 | * | |
263 | * Note that any pathname within the set of received paths MAY cause | |
264 | * cache-entry or istate flag bits to be updated and thus cause the | |
265 | * index to be updated on disk. | |
266 | * | |
267 | * However, the response may contain many paths (such as ignored | |
268 | * paths) that will not update any flag bits. And thus not force the | |
269 | * index to be updated. (This is fine and normal.) It also means | |
270 | * that the token will not be updated in the FSMonitor index | |
271 | * extension. So the next Git command will find the same token in the | |
272 | * index, make the same token-relative request, and receive the same | |
273 | * response (plus any newly changed paths). If this response is large | |
274 | * (and continues to grow), performance could be impacted. | |
275 | * | |
276 | * For example, if the user runs a build and it writes 100K object | |
277 | * files but doesn't modify any source files, the index would not need | |
278 | * to be updated. The FSMonitor response (after the build and | |
279 | * relative to a pre-build token) might be 5MB. Each subsequent Git | |
280 | * command will receive that same 100K/5MB response until something | |
281 | * causes the index to be updated. And `refresh_fsmonitor()` will | |
282 | * have to iterate over those 100K paths each time. | |
283 | * | |
284 | * Performance could be improved if we optionally force update the | |
285 | * index after a very large response and get an updated token into | |
286 | * the FSMonitor index extension. This should allow subsequent | |
287 | * commands to get smaller and more current responses. | |
288 | * | |
289 | * The value chosen here does not need to be precise. The index | |
290 | * will be updated automatically the first time the user touches | |
291 | * a tracked file and causes a command like `git status` to | |
292 | * update an mtime to be updated and/or set a flag bit. | |
293 | */ | |
294 | static int fsmonitor_force_update_threshold = 100; | |
295 | ||
883e248b BP |
296 | void refresh_fsmonitor(struct index_state *istate) |
297 | { | |
883e248b | 298 | struct strbuf query_result = STRBUF_INIT; |
8da2c576 KW |
299 | int query_success = 0, hook_version = -1; |
300 | size_t bol = 0; /* beginning of line */ | |
883e248b | 301 | uint64_t last_update; |
56c69100 | 302 | struct strbuf last_update_token = STRBUF_INIT; |
883e248b | 303 | char *buf; |
5d137fc2 | 304 | unsigned int i; |
974c1b39 | 305 | int is_trivial = 0; |
1e0ea5c4 JH |
306 | struct repository *r = istate->repo ? istate->repo : the_repository; |
307 | enum fsmonitor_mode fsm_mode = fsm_settings__get_mode(r); | |
883e248b | 308 | |
1e0ea5c4 JH |
309 | if (fsm_mode <= FSMONITOR_MODE_DISABLED || |
310 | istate->fsmonitor_has_run_once) | |
883e248b | 311 | return; |
8da2c576 | 312 | |
398a3b08 | 313 | istate->fsmonitor_has_run_once = 1; |
883e248b BP |
314 | |
315 | trace_printf_key(&trace_fsmonitor, "refresh fsmonitor"); | |
1e0ea5c4 JH |
316 | |
317 | if (fsm_mode == FSMONITOR_MODE_IPC) { | |
9c307e8a JH |
318 | query_success = !fsmonitor_ipc__send_query( |
319 | istate->fsmonitor_last_update ? | |
320 | istate->fsmonitor_last_update : "builtin:fake", | |
321 | &query_result); | |
322 | if (query_success) { | |
323 | /* | |
324 | * The response contains a series of nul terminated | |
325 | * strings. The first is the new token. | |
326 | * | |
327 | * Use `char *buf` as an interlude to trick the CI | |
328 | * static analysis to let us use `strbuf_addstr()` | |
329 | * here (and only copy the token) rather than | |
330 | * `strbuf_addbuf()`. | |
331 | */ | |
332 | buf = query_result.buf; | |
333 | strbuf_addstr(&last_update_token, buf); | |
334 | bol = last_update_token.len + 1; | |
335 | is_trivial = query_result.buf[bol] == '/'; | |
336 | if (is_trivial) | |
337 | trace2_data_intmax("fsm_client", NULL, | |
338 | "query/trivial-response", 1); | |
339 | } else { | |
340 | /* | |
341 | * The builtin daemon is not available on this | |
342 | * platform -OR- we failed to get a response. | |
343 | * | |
344 | * Generate a fake token (rather than a V1 | |
345 | * timestamp) for the index extension. (If | |
346 | * they switch back to the hook API, we don't | |
347 | * want ambiguous state.) | |
348 | */ | |
349 | strbuf_addstr(&last_update_token, "builtin:fake"); | |
350 | } | |
351 | ||
352 | goto apply_results; | |
1e0ea5c4 JH |
353 | } |
354 | ||
355 | assert(fsm_mode == FSMONITOR_MODE_HOOK); | |
356 | ||
357 | hook_version = fsmonitor_hook_version(); | |
358 | ||
883e248b | 359 | /* |
1e0ea5c4 | 360 | * This could be racy so save the date/time now and query_fsmonitor_hook |
883e248b BP |
361 | * should be inclusive to ensure we don't miss potential changes. |
362 | */ | |
363 | last_update = getnanotime(); | |
8da2c576 KW |
364 | if (hook_version == HOOK_INTERFACE_VERSION1) |
365 | strbuf_addf(&last_update_token, "%"PRIu64"", last_update); | |
883e248b BP |
366 | |
367 | /* | |
1e0ea5c4 | 368 | * If we have a last update token, call query_fsmonitor_hook for the set of |
8da2c576 | 369 | * changes since that token, else assume everything is possibly dirty |
883e248b BP |
370 | * and check it all. |
371 | */ | |
372 | if (istate->fsmonitor_last_update) { | |
8da2c576 | 373 | if (hook_version == -1 || hook_version == HOOK_INTERFACE_VERSION2) { |
1e0ea5c4 JH |
374 | query_success = !query_fsmonitor_hook( |
375 | r, HOOK_INTERFACE_VERSION2, | |
8da2c576 KW |
376 | istate->fsmonitor_last_update, &query_result); |
377 | ||
378 | if (query_success) { | |
379 | if (hook_version < 0) | |
380 | hook_version = HOOK_INTERFACE_VERSION2; | |
381 | ||
382 | /* | |
383 | * First entry will be the last update token | |
384 | * Need to use a char * variable because static | |
385 | * analysis was suggesting to use strbuf_addbuf | |
386 | * but we don't want to copy the entire strbuf | |
6d12b533 | 387 | * only the chars up to the first NUL |
8da2c576 KW |
388 | */ |
389 | buf = query_result.buf; | |
390 | strbuf_addstr(&last_update_token, buf); | |
391 | if (!last_update_token.len) { | |
392 | warning("Empty last update token."); | |
393 | query_success = 0; | |
394 | } else { | |
395 | bol = last_update_token.len + 1; | |
974c1b39 | 396 | is_trivial = query_result.buf[bol] == '/'; |
8da2c576 KW |
397 | } |
398 | } else if (hook_version < 0) { | |
399 | hook_version = HOOK_INTERFACE_VERSION1; | |
400 | if (!last_update_token.len) | |
401 | strbuf_addf(&last_update_token, "%"PRIu64"", last_update); | |
402 | } | |
403 | } | |
404 | ||
405 | if (hook_version == HOOK_INTERFACE_VERSION1) { | |
1e0ea5c4 JH |
406 | query_success = !query_fsmonitor_hook( |
407 | r, HOOK_INTERFACE_VERSION1, | |
8da2c576 | 408 | istate->fsmonitor_last_update, &query_result); |
974c1b39 JH |
409 | if (query_success) |
410 | is_trivial = query_result.buf[0] == '/'; | |
8da2c576 KW |
411 | } |
412 | ||
974c1b39 JH |
413 | if (is_trivial) |
414 | trace2_data_intmax("fsm_hook", NULL, | |
415 | "query/trivial-response", 1); | |
416 | ||
1e0ea5c4 JH |
417 | trace_performance_since(last_update, "fsmonitor process '%s'", |
418 | fsm_settings__get_hook_path(r)); | |
419 | trace_printf_key(&trace_fsmonitor, | |
420 | "fsmonitor process '%s' returned %s", | |
421 | fsm_settings__get_hook_path(r), | |
422 | query_success ? "success" : "failure"); | |
883e248b BP |
423 | } |
424 | ||
9c307e8a | 425 | apply_results: |
974c1b39 JH |
426 | /* |
427 | * The response from FSMonitor (excluding the header token) is | |
428 | * either: | |
429 | * | |
430 | * [a] a (possibly empty) list of NUL delimited relative | |
431 | * pathnames of changed paths. This list can contain | |
432 | * files and directories. Directories have a trailing | |
433 | * slash. | |
434 | * | |
435 | * [b] a single '/' to indicate the provider had no | |
436 | * information and that we should consider everything | |
437 | * invalid. We call this a trivial response. | |
438 | */ | |
26b9f34a JH |
439 | trace2_region_enter("fsmonitor", "apply_results", istate->repo); |
440 | ||
974c1b39 JH |
441 | if (query_success && !is_trivial) { |
442 | /* | |
443 | * Mark all pathnames returned by the monitor as dirty. | |
444 | * | |
445 | * This updates both the cache-entries and the untracked-cache. | |
446 | */ | |
26b9f34a JH |
447 | int count = 0; |
448 | ||
883e248b | 449 | buf = query_result.buf; |
8da2c576 | 450 | for (i = bol; i < query_result.len; i++) { |
883e248b BP |
451 | if (buf[i] != '\0') |
452 | continue; | |
453 | fsmonitor_refresh_callback(istate, buf + bol); | |
454 | bol = i + 1; | |
26b9f34a | 455 | count++; |
883e248b | 456 | } |
26b9f34a | 457 | if (bol < query_result.len) { |
883e248b | 458 | fsmonitor_refresh_callback(istate, buf + bol); |
26b9f34a JH |
459 | count++; |
460 | } | |
679f2f9f US |
461 | |
462 | /* Now mark the untracked cache for fsmonitor usage */ | |
463 | if (istate->untracked) | |
464 | istate->untracked->use_fsmonitor = 1; | |
26b9f34a JH |
465 | |
466 | if (count > fsmonitor_force_update_threshold) | |
467 | istate->cache_changed |= FSMONITOR_CHANGED; | |
468 | ||
469 | trace2_data_intmax("fsmonitor", istate->repo, "apply_count", | |
470 | count); | |
471 | ||
883e248b | 472 | } else { |
974c1b39 JH |
473 | /* |
474 | * We failed to get a response or received a trivial response, | |
475 | * so invalidate everything. | |
476 | * | |
477 | * We only want to run the post index changed hook if | |
478 | * we've actually changed entries, so keep track if we | |
479 | * actually changed entries or not. | |
480 | */ | |
679f2f9f | 481 | int is_cache_changed = 0; |
974c1b39 | 482 | |
679f2f9f US |
483 | for (i = 0; i < istate->cache_nr; i++) { |
484 | if (istate->cache[i]->ce_flags & CE_FSMONITOR_VALID) { | |
485 | is_cache_changed = 1; | |
486 | istate->cache[i]->ce_flags &= ~CE_FSMONITOR_VALID; | |
487 | } | |
488 | } | |
883e248b | 489 | |
974c1b39 JH |
490 | /* |
491 | * If we're going to check every file, ensure we save | |
492 | * the results. | |
493 | */ | |
679f2f9f US |
494 | if (is_cache_changed) |
495 | istate->cache_changed |= FSMONITOR_CHANGED; | |
ca598d5f | 496 | |
883e248b BP |
497 | if (istate->untracked) |
498 | istate->untracked->use_fsmonitor = 0; | |
499 | } | |
26b9f34a JH |
500 | trace2_region_leave("fsmonitor", "apply_results", istate->repo); |
501 | ||
883e248b BP |
502 | strbuf_release(&query_result); |
503 | ||
56c69100 KW |
504 | /* Now that we've updated istate, save the last_update_token */ |
505 | FREE_AND_NULL(istate->fsmonitor_last_update); | |
506 | istate->fsmonitor_last_update = strbuf_detach(&last_update_token, NULL); | |
883e248b BP |
507 | } |
508 | ||
fcd19b09 JH |
509 | /* |
510 | * The caller wants to turn on FSMonitor. And when the caller writes | |
511 | * the index to disk, a FSMonitor extension should be included. This | |
512 | * requires that `istate->fsmonitor_last_update` not be NULL. But we | |
513 | * have not actually talked to a FSMonitor process yet, so we don't | |
514 | * have an initial value for this field. | |
515 | * | |
516 | * For a protocol V1 FSMonitor process, this field is a formatted | |
517 | * "nanoseconds since epoch" field. However, for a protocol V2 | |
518 | * FSMonitor process, this field is an opaque token. | |
519 | * | |
520 | * Historically, `add_fsmonitor()` has initialized this field to the | |
521 | * current time for protocol V1 processes. There are lots of race | |
522 | * conditions here, but that code has shipped... | |
523 | * | |
524 | * The only true solution is to use a V2 FSMonitor and get a current | |
525 | * or default token value (that it understands), but we cannot do that | |
526 | * until we have actually talked to an instance of the FSMonitor process | |
527 | * (but the protocol requires that we send a token first...). | |
528 | * | |
529 | * For simplicity, just initialize like we have a V1 process and require | |
530 | * that V2 processes adapt. | |
531 | */ | |
532 | static void initialize_fsmonitor_last_update(struct index_state *istate) | |
533 | { | |
534 | struct strbuf last_update = STRBUF_INIT; | |
535 | ||
536 | strbuf_addf(&last_update, "%"PRIu64"", getnanotime()); | |
537 | istate->fsmonitor_last_update = strbuf_detach(&last_update, NULL); | |
538 | } | |
539 | ||
883e248b BP |
540 | void add_fsmonitor(struct index_state *istate) |
541 | { | |
5d137fc2 | 542 | unsigned int i; |
883e248b BP |
543 | |
544 | if (!istate->fsmonitor_last_update) { | |
545 | trace_printf_key(&trace_fsmonitor, "add fsmonitor"); | |
546 | istate->cache_changed |= FSMONITOR_CHANGED; | |
fcd19b09 | 547 | initialize_fsmonitor_last_update(istate); |
883e248b BP |
548 | |
549 | /* reset the fsmonitor state */ | |
550 | for (i = 0; i < istate->cache_nr; i++) | |
551 | istate->cache[i]->ce_flags &= ~CE_FSMONITOR_VALID; | |
552 | ||
553 | /* reset the untracked cache */ | |
554 | if (istate->untracked) { | |
555 | add_untracked_cache(istate); | |
556 | istate->untracked->use_fsmonitor = 1; | |
557 | } | |
558 | ||
559 | /* Update the fsmonitor state */ | |
560 | refresh_fsmonitor(istate); | |
561 | } | |
562 | } | |
563 | ||
564 | void remove_fsmonitor(struct index_state *istate) | |
565 | { | |
566 | if (istate->fsmonitor_last_update) { | |
567 | trace_printf_key(&trace_fsmonitor, "remove fsmonitor"); | |
568 | istate->cache_changed |= FSMONITOR_CHANGED; | |
56c69100 | 569 | FREE_AND_NULL(istate->fsmonitor_last_update); |
883e248b BP |
570 | } |
571 | } | |
572 | ||
573 | void tweak_fsmonitor(struct index_state *istate) | |
574 | { | |
5d137fc2 | 575 | unsigned int i; |
1e0ea5c4 JH |
576 | int fsmonitor_enabled = (fsm_settings__get_mode(istate->repo) |
577 | > FSMONITOR_MODE_DISABLED); | |
ba1b9cac AV |
578 | |
579 | if (istate->fsmonitor_dirty) { | |
580 | if (fsmonitor_enabled) { | |
581 | /* Mark all entries valid */ | |
582 | for (i = 0; i < istate->cache_nr; i++) { | |
f954c7b8 JH |
583 | if (S_ISGITLINK(istate->cache[i]->ce_mode)) |
584 | continue; | |
ba1b9cac AV |
585 | istate->cache[i]->ce_flags |= CE_FSMONITOR_VALID; |
586 | } | |
587 | ||
588 | /* Mark all previously saved entries as dirty */ | |
cae70acf | 589 | assert_index_minimum(istate, istate->fsmonitor_dirty->bit_size); |
ba1b9cac AV |
590 | ewah_each_bit(istate->fsmonitor_dirty, fsmonitor_ewah_callback, istate); |
591 | ||
679f2f9f | 592 | refresh_fsmonitor(istate); |
ba1b9cac AV |
593 | } |
594 | ||
595 | ewah_free(istate->fsmonitor_dirty); | |
596 | istate->fsmonitor_dirty = NULL; | |
597 | } | |
598 | ||
1e0ea5c4 | 599 | if (fsmonitor_enabled) |
883e248b | 600 | add_fsmonitor(istate); |
1e0ea5c4 JH |
601 | else |
602 | remove_fsmonitor(istate); | |
883e248b | 603 | } |