]>
Commit | Line | Data |
---|---|---|
22be093f LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2010 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 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 | General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | #include <errno.h> | |
23 | #include <inttypes.h> | |
24 | #include <fcntl.h> | |
25 | #include <linux/limits.h> | |
26 | #include <stdbool.h> | |
27 | #include <stdio.h> | |
28 | #include <stdlib.h> | |
29 | #include <string.h> | |
30 | #include <sys/select.h> | |
31 | #include <sys/time.h> | |
32 | #include <sys/types.h> | |
33 | #include <sys/stat.h> | |
34 | #include <unistd.h> | |
35 | #include <linux/fanotify.h> | |
36 | #include <sys/signalfd.h> | |
37 | #include <sys/poll.h> | |
38 | #include <sys/mman.h> | |
39 | #include <linux/fs.h> | |
40 | #include <linux/fiemap.h> | |
41 | #include <sys/ioctl.h> | |
746f8906 | 42 | #include <sys/vfs.h> |
8260358d | 43 | #include <getopt.h> |
6624768c | 44 | #include <sys/inotify.h> |
22be093f LP |
45 | |
46 | #include "missing.h" | |
47 | #include "util.h" | |
48 | #include "set.h" | |
49 | #include "sd-daemon.h" | |
50 | #include "ioprio.h" | |
51 | #include "readahead-common.h" | |
52 | ||
41a598e2 LP |
53 | /* fixme: |
54 | * | |
408b85df | 55 | * - detect ssd on btrfs/lvm... |
41a598e2 | 56 | * - read ahead directories |
408b85df | 57 | * - gzip? |
8260358d | 58 | * - remount rw? |
6624768c | 59 | * - handle files where nothing is in mincore |
408b85df | 60 | * - does ioprio_set work with fadvise()? |
41a598e2 LP |
61 | */ |
62 | ||
8260358d LP |
63 | static unsigned arg_files_max = 16*1024; |
64 | static off_t arg_file_size_max = READAHEAD_FILE_SIZE_MAX; | |
65 | static usec_t arg_timeout = 2*USEC_PER_MINUTE; | |
66 | ||
d9c7a87b LP |
67 | static ReadaheadShared *shared = NULL; |
68 | ||
2e7485f0 LP |
69 | /* Avoid collisions with the NULL pointer */ |
70 | #define SECTOR_TO_PTR(s) ULONG_TO_PTR((s)+1) | |
71 | #define PTR_TO_SECTOR(p) (PTR_TO_ULONG(p)-1) | |
72 | ||
746f8906 LP |
73 | static int btrfs_defrag(int fd) { |
74 | struct btrfs_ioctl_vol_args data; | |
22be093f | 75 | |
746f8906 LP |
76 | zero(data); |
77 | data.fd = fd; | |
22be093f | 78 | |
746f8906 LP |
79 | return ioctl(fd, BTRFS_IOC_DEFRAG, &data); |
80 | } | |
81 | ||
82 | static int pack_file(FILE *pack, const char *fn, bool on_btrfs) { | |
22be093f LP |
83 | struct stat st; |
84 | void *start = MAP_FAILED; | |
8260358d | 85 | uint8_t *vec; |
22be093f LP |
86 | uint32_t b, c; |
87 | size_t l, pages; | |
88 | bool mapped; | |
89 | int r = 0, fd = -1, k; | |
90 | ||
91 | assert(pack); | |
92 | assert(fn); | |
93 | ||
94 | if ((fd = open(fn, O_RDONLY|O_CLOEXEC|O_NOATIME|O_NOCTTY|O_NOFOLLOW)) < 0) { | |
a78899f5 LP |
95 | |
96 | if (errno == ENOENT) | |
97 | return 0; | |
98 | ||
a76fad09 LP |
99 | if (errno == EPERM || errno == EACCES) |
100 | return 0; | |
101 | ||
22be093f LP |
102 | log_warning("open(%s) failed: %m", fn); |
103 | r = -errno; | |
104 | goto finish; | |
105 | } | |
106 | ||
8260358d | 107 | if ((k = file_verify(fd, fn, arg_file_size_max, &st)) <= 0) { |
22be093f LP |
108 | r = k; |
109 | goto finish; | |
110 | } | |
111 | ||
746f8906 LP |
112 | if (on_btrfs) |
113 | btrfs_defrag(fd); | |
114 | ||
22be093f LP |
115 | l = PAGE_ALIGN(st.st_size); |
116 | if ((start = mmap(NULL, l, PROT_READ, MAP_SHARED, fd, 0)) == MAP_FAILED) { | |
117 | log_warning("mmap(%s) failed: %m", fn); | |
118 | r = -errno; | |
119 | goto finish; | |
120 | } | |
121 | ||
8260358d LP |
122 | pages = l / PAGE_SIZE; |
123 | ||
124 | vec = alloca(pages); | |
22be093f LP |
125 | if (mincore(start, l, vec) < 0) { |
126 | log_warning("mincore(%s) failed: %m", fn); | |
127 | r = -errno; | |
128 | goto finish; | |
129 | } | |
130 | ||
131 | fputs(fn, pack); | |
132 | fputc('\n', pack); | |
133 | ||
22be093f LP |
134 | mapped = false; |
135 | for (c = 0; c < pages; c++) { | |
408b85df | 136 | bool new_mapped = !!(vec[c] & 1); |
22be093f LP |
137 | |
138 | if (!mapped && new_mapped) | |
139 | b = c; | |
140 | else if (mapped && !new_mapped) { | |
141 | fwrite(&b, sizeof(b), 1, pack); | |
142 | fwrite(&c, sizeof(c), 1, pack); | |
143 | ||
144 | log_debug("%s: page %u to %u", fn, b, c); | |
145 | } | |
146 | ||
147 | mapped = new_mapped; | |
148 | } | |
149 | ||
150 | /* We don't write any range data if we should read the entire file */ | |
151 | if (mapped && b > 0) { | |
152 | fwrite(&b, sizeof(b), 1, pack); | |
153 | fwrite(&c, sizeof(c), 1, pack); | |
154 | ||
155 | log_debug("%s: page %u to %u", fn, b, c); | |
156 | } | |
157 | ||
158 | /* End marker */ | |
159 | b = 0; | |
160 | fwrite(&b, sizeof(b), 1, pack); | |
161 | fwrite(&b, sizeof(b), 1, pack); | |
162 | ||
163 | finish: | |
164 | if (start != MAP_FAILED) | |
165 | munmap(start, l); | |
166 | ||
167 | if (fd >= 0) | |
168 | close_nointr_nofail(fd); | |
169 | ||
170 | return r; | |
171 | } | |
172 | ||
173 | static unsigned long fd_first_block(int fd) { | |
174 | struct { | |
175 | struct fiemap fiemap; | |
176 | struct fiemap_extent extent; | |
177 | } data; | |
178 | ||
179 | zero(data); | |
180 | data.fiemap.fm_length = ~0ULL; | |
181 | data.fiemap.fm_extent_count = 1; | |
182 | ||
183 | if (ioctl(fd, FS_IOC_FIEMAP, &data) < 0) | |
184 | return 0; | |
185 | ||
186 | if (data.fiemap.fm_mapped_extents <= 0) | |
187 | return 0; | |
188 | ||
189 | if (data.fiemap.fm_extents[0].fe_flags & FIEMAP_EXTENT_UNKNOWN) | |
190 | return 0; | |
191 | ||
192 | return (unsigned long) data.fiemap.fm_extents[0].fe_physical; | |
193 | } | |
194 | ||
195 | struct item { | |
196 | const char *path; | |
197 | unsigned long block; | |
198 | }; | |
199 | ||
200 | static int qsort_compare(const void *a, const void *b) { | |
201 | const struct item *i, *j; | |
202 | ||
203 | i = a; | |
204 | j = b; | |
205 | ||
206 | if (i->block < j->block) | |
207 | return -1; | |
208 | if (i->block > j->block) | |
209 | return 1; | |
210 | ||
211 | return strcmp(i->path, j->path); | |
212 | } | |
213 | ||
214 | static int collect(const char *root) { | |
215 | enum { | |
858209c5 | 216 | FD_FANOTIFY, /* Get the actual fs events */ |
22be093f | 217 | FD_SIGNAL, |
6624768c | 218 | FD_INOTIFY, /* We get notifications to quit early via this fd */ |
22be093f LP |
219 | _FD_MAX |
220 | }; | |
221 | struct pollfd pollfd[_FD_MAX]; | |
6624768c | 222 | int fanotify_fd = -1, signal_fd = -1, inotify_fd = -1, r = 0; |
22be093f LP |
223 | pid_t my_pid; |
224 | Hashmap *files = NULL; | |
225 | Iterator i; | |
226 | char *p, *q; | |
227 | sigset_t mask; | |
228 | FILE *pack = NULL; | |
229 | char *pack_fn_new = NULL, *pack_fn = NULL; | |
746f8906 LP |
230 | bool on_ssd, on_btrfs; |
231 | struct statfs sfs; | |
408b85df | 232 | usec_t not_after; |
22be093f LP |
233 | |
234 | assert(root); | |
235 | ||
75a010e0 LP |
236 | write_one_line_file("/proc/self/oom_score_adj", "1000"); |
237 | ||
22be093f LP |
238 | if (ioprio_set(IOPRIO_WHO_PROCESS, getpid(), IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0)) < 0) |
239 | log_warning("Failed to set IDLE IO priority class: %m"); | |
240 | ||
241 | assert_se(sigemptyset(&mask) == 0); | |
242 | sigset_add_many(&mask, SIGINT, SIGTERM, -1); | |
243 | assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0); | |
244 | ||
245 | if ((signal_fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC)) < 0) { | |
246 | log_error("signalfd(): %m"); | |
247 | r = -errno; | |
248 | goto finish; | |
249 | } | |
250 | ||
251 | if (!(files = hashmap_new(string_hash_func, string_compare_func))) { | |
252 | log_error("Failed to allocate set."); | |
253 | r = -ENOMEM; | |
254 | goto finish; | |
255 | } | |
256 | ||
408b85df | 257 | if ((fanotify_fd = fanotify_init(FAN_CLOEXEC|FAN_NONBLOCK, O_RDONLY|O_LARGEFILE|O_CLOEXEC|O_NOATIME)) < 0) { |
22be093f LP |
258 | log_error("Failed to create fanotify object: %m"); |
259 | r = -errno; | |
260 | goto finish; | |
261 | } | |
262 | ||
263 | if (fanotify_mark(fanotify_fd, FAN_MARK_ADD|FAN_MARK_MOUNT, FAN_OPEN, AT_FDCWD, root) < 0) { | |
264 | log_error("Failed to mark %s: %m", root); | |
265 | r = -errno; | |
266 | goto finish; | |
267 | } | |
268 | ||
6624768c LP |
269 | if ((inotify_fd = open_inotify()) < 0) { |
270 | r = inotify_fd; | |
271 | goto finish; | |
272 | } | |
273 | ||
8260358d | 274 | not_after = now(CLOCK_MONOTONIC) + arg_timeout; |
408b85df | 275 | |
22be093f LP |
276 | my_pid = getpid(); |
277 | ||
278 | zero(pollfd); | |
279 | pollfd[FD_FANOTIFY].fd = fanotify_fd; | |
280 | pollfd[FD_FANOTIFY].events = POLLIN; | |
281 | pollfd[FD_SIGNAL].fd = signal_fd; | |
282 | pollfd[FD_SIGNAL].events = POLLIN; | |
6624768c LP |
283 | pollfd[FD_INOTIFY].fd = inotify_fd; |
284 | pollfd[FD_INOTIFY].events = POLLIN; | |
22be093f LP |
285 | |
286 | sd_notify(0, | |
287 | "READY=1\n" | |
288 | "STATUS=Collecting readahead data"); | |
289 | ||
290 | log_debug("Collecting..."); | |
291 | ||
6624768c LP |
292 | if (access("/dev/.systemd/readahead/cancel", F_OK) >= 0) { |
293 | log_debug("Collection canceled"); | |
294 | r = -ECANCELED; | |
295 | goto finish; | |
296 | } | |
297 | ||
298 | if (access("/dev/.systemd/readahead/done", F_OK) >= 0) { | |
299 | log_debug("Got termination request"); | |
300 | goto done; | |
301 | } | |
302 | ||
22be093f LP |
303 | for (;;) { |
304 | union { | |
305 | struct fanotify_event_metadata metadata; | |
306 | char buffer[4096]; | |
307 | } data; | |
308 | ssize_t n; | |
309 | struct fanotify_event_metadata *m; | |
408b85df LP |
310 | usec_t t; |
311 | int h; | |
22be093f | 312 | |
8260358d | 313 | if (hashmap_size(files) > arg_files_max) { |
408b85df | 314 | log_debug("Reached maximum number of read ahead files, ending collection."); |
6e3eb5ba | 315 | break; |
408b85df LP |
316 | } |
317 | ||
318 | t = now(CLOCK_MONOTONIC); | |
319 | if (t >= not_after) { | |
320 | log_debug("Reached maximum collection time, ending collection."); | |
321 | break; | |
322 | } | |
6e3eb5ba | 323 | |
408b85df | 324 | if ((h = poll(pollfd, _FD_MAX, (int) ((not_after - t) / USEC_PER_MSEC))) < 0) { |
22be093f LP |
325 | |
326 | if (errno == EINTR) | |
327 | continue; | |
328 | ||
329 | log_error("poll(): %m"); | |
330 | r = -errno; | |
331 | goto finish; | |
332 | } | |
333 | ||
408b85df LP |
334 | if (h == 0) { |
335 | log_debug("Reached maximum collection time, ending collection."); | |
336 | break; | |
337 | } | |
338 | ||
6624768c LP |
339 | if (pollfd[FD_SIGNAL].revents) { |
340 | log_debug("Got signal."); | |
341 | break; | |
342 | } | |
343 | ||
344 | if (pollfd[FD_INOTIFY].revents) { | |
345 | uint8_t inotify_buffer[sizeof(struct inotify_event) + FILENAME_MAX]; | |
346 | struct inotify_event *e; | |
347 | ||
348 | if ((n = read(inotify_fd, &inotify_buffer, sizeof(inotify_buffer))) < 0) { | |
349 | if (errno == EINTR || errno == EAGAIN) | |
350 | continue; | |
351 | ||
352 | log_error("Failed to read inotify event: %m"); | |
353 | r = -errno; | |
354 | goto finish; | |
355 | } | |
356 | ||
357 | e = (struct inotify_event*) inotify_buffer; | |
358 | while (n > 0) { | |
359 | size_t step; | |
360 | ||
361 | if ((e->mask & IN_CREATE) && streq(e->name, "cancel")) { | |
362 | log_debug("Collection canceled"); | |
363 | r = -ECANCELED; | |
364 | goto finish; | |
365 | } | |
366 | ||
367 | if ((e->mask & IN_CREATE) && streq(e->name, "done")) { | |
368 | log_debug("Got termination request"); | |
369 | goto done; | |
370 | } | |
371 | ||
372 | step = sizeof(struct inotify_event) + e->len; | |
373 | assert(step <= (size_t) n); | |
374 | ||
375 | e = (struct inotify_event*) ((uint8_t*) e + step); | |
376 | n -= step; | |
377 | } | |
378 | } | |
379 | ||
22be093f LP |
380 | if ((n = read(fanotify_fd, &data, sizeof(data))) < 0) { |
381 | ||
382 | if (errno == EINTR || errno == EAGAIN) | |
383 | continue; | |
384 | ||
385 | log_error("Failed to read event: %m"); | |
386 | r = -errno; | |
387 | goto finish; | |
388 | } | |
389 | ||
408b85df | 390 | for (m = &data.metadata; FAN_EVENT_OK(m, n); m = FAN_EVENT_NEXT(m, n)) { |
d9c7a87b LP |
391 | char fn[PATH_MAX]; |
392 | int k; | |
22be093f | 393 | |
d9c7a87b LP |
394 | if (m->fd < 0) |
395 | goto next_iteration; | |
22be093f | 396 | |
d9c7a87b LP |
397 | if (m->pid == my_pid) |
398 | goto next_iteration; | |
22be093f | 399 | |
d9c7a87b LP |
400 | __sync_synchronize(); |
401 | if (m->pid == shared->replay) | |
402 | goto next_iteration; | |
22be093f | 403 | |
d9c7a87b LP |
404 | snprintf(fn, sizeof(fn), "/proc/self/fd/%i", m->fd); |
405 | char_array_0(fn); | |
406 | ||
407 | if ((k = readlink_malloc(fn, &p)) >= 0) { | |
d9c7a87b | 408 | if (startswith(p, "/tmp") || |
0840ce2d | 409 | endswith(p, " (deleted)") || |
d9c7a87b LP |
410 | hashmap_get(files, p)) |
411 | /* Not interesting, or | |
412 | * already read */ | |
413 | free(p); | |
414 | else { | |
415 | unsigned long ul; | |
22be093f | 416 | |
d9c7a87b LP |
417 | ul = fd_first_block(m->fd); |
418 | ||
419 | if ((k = hashmap_put(files, p, SECTOR_TO_PTR(ul))) < 0) { | |
420 | log_warning("set_put() failed: %s", strerror(-k)); | |
421 | free(p); | |
22be093f | 422 | } |
d9c7a87b | 423 | } |
22be093f | 424 | |
d9c7a87b LP |
425 | } else |
426 | log_warning("readlink(%s) failed: %s", fn, strerror(-k)); | |
22be093f | 427 | |
d9c7a87b | 428 | next_iteration: |
22be093f LP |
429 | if (m->fd) |
430 | close_nointr_nofail(m->fd); | |
22be093f | 431 | } |
22be093f LP |
432 | } |
433 | ||
6624768c | 434 | done: |
22be093f LP |
435 | if (fanotify_fd >= 0) { |
436 | close_nointr_nofail(fanotify_fd); | |
437 | fanotify_fd = -1; | |
438 | } | |
439 | ||
440 | log_debug("Writing Pack File..."); | |
441 | ||
55888fa4 | 442 | on_ssd = fs_on_ssd(root) > 0; |
22be093f LP |
443 | log_debug("On SSD: %s", yes_no(on_ssd)); |
444 | ||
5b61848d | 445 | on_btrfs = statfs(root, &sfs) >= 0 && (long) sfs.f_type == (long) BTRFS_SUPER_MAGIC; |
746f8906 LP |
446 | log_debug("On btrfs: %s", yes_no(on_btrfs)); |
447 | ||
22be093f LP |
448 | asprintf(&pack_fn, "%s/.readahead", root); |
449 | asprintf(&pack_fn_new, "%s/.readahead.new", root); | |
450 | ||
451 | if (!pack_fn || !pack_fn_new) { | |
452 | log_error("Out of memory"); | |
453 | r = -ENOMEM; | |
454 | goto finish; | |
455 | } | |
456 | ||
457 | if (!(pack = fopen(pack_fn_new, "we"))) { | |
458 | log_error("Failed to open pack file: %m"); | |
459 | r = -errno; | |
460 | goto finish; | |
461 | } | |
462 | ||
463 | fputs(CANONICAL_HOST "\n", pack); | |
464 | putc(on_ssd ? 'S' : 'R', pack); | |
465 | ||
746f8906 | 466 | if (on_ssd || on_btrfs) { |
22be093f | 467 | |
746f8906 | 468 | /* On SSD or on btrfs, just write things out in the |
41a598e2 | 469 | * order the files were accessed. */ |
22be093f LP |
470 | |
471 | HASHMAP_FOREACH_KEY(q, p, files, i) | |
746f8906 | 472 | pack_file(pack, p, on_btrfs); |
22be093f LP |
473 | } else { |
474 | struct item *ordered, *j; | |
475 | unsigned k, n; | |
476 | ||
477 | /* On rotating media, order things by the block | |
478 | * numbers */ | |
479 | ||
480 | log_debug("Ordering..."); | |
481 | ||
482 | n = hashmap_size(files); | |
483 | if (!(ordered = new(struct item, n))) { | |
484 | log_error("Out of memory"); | |
485 | r = -ENOMEM; | |
486 | goto finish; | |
487 | } | |
488 | ||
489 | j = ordered; | |
490 | HASHMAP_FOREACH_KEY(q, p, files, i) { | |
491 | j->path = p; | |
2e7485f0 | 492 | j->block = PTR_TO_SECTOR(q); |
22be093f LP |
493 | j++; |
494 | } | |
495 | ||
496 | assert(ordered + n == j); | |
497 | ||
498 | qsort(ordered, n, sizeof(struct item), qsort_compare); | |
499 | ||
500 | for (k = 0; k < n; k++) | |
746f8906 | 501 | pack_file(pack, ordered[k].path, on_btrfs); |
22be093f LP |
502 | |
503 | free(ordered); | |
504 | } | |
505 | ||
506 | log_debug("Finalizing..."); | |
507 | ||
508 | fflush(pack); | |
509 | ||
510 | if (ferror(pack)) { | |
511 | log_error("Failed to write pack file."); | |
512 | r = -EIO; | |
513 | goto finish; | |
514 | } | |
515 | ||
516 | if (rename(pack_fn_new, pack_fn) < 0) { | |
517 | log_error("Failed to rename readahead file: %m"); | |
518 | r = -errno; | |
519 | goto finish; | |
520 | } | |
521 | ||
522 | fclose(pack); | |
523 | pack = NULL; | |
524 | ||
525 | log_debug("Done."); | |
526 | ||
527 | finish: | |
528 | if (fanotify_fd >= 0) | |
529 | close_nointr_nofail(fanotify_fd); | |
530 | ||
531 | if (signal_fd >= 0) | |
532 | close_nointr_nofail(signal_fd); | |
533 | ||
6624768c LP |
534 | if (inotify_fd >= 0) |
535 | close_nointr_nofail(inotify_fd); | |
536 | ||
22be093f LP |
537 | if (pack) { |
538 | fclose(pack); | |
539 | unlink(pack_fn_new); | |
540 | } | |
541 | ||
542 | free(pack_fn_new); | |
543 | free(pack_fn); | |
544 | ||
545 | while ((p = hashmap_steal_first_key(files))) | |
f0cf061e | 546 | free(p); |
22be093f LP |
547 | |
548 | hashmap_free(files); | |
549 | ||
550 | return r; | |
551 | } | |
552 | ||
8260358d LP |
553 | static int help(void) { |
554 | ||
555 | printf("%s [OPTIONS...] [DIRECTORY]\n\n" | |
556 | "Collect read-ahead data on early boot.\n\n" | |
557 | " -h --help Show this help\n" | |
558 | " --max-files=INT Maximum number of files to read ahead\n" | |
559 | " --max-file-size=BYTES Maximum size of files to read ahead\n" | |
560 | " --timeout=USEC Maximum time to spend collecting data\n", | |
561 | program_invocation_short_name); | |
562 | ||
563 | return 0; | |
564 | } | |
565 | ||
566 | static int parse_argv(int argc, char *argv[]) { | |
567 | ||
568 | enum { | |
569 | ARG_FILES_MAX = 0x100, | |
570 | ARG_FILE_SIZE_MAX, | |
571 | ARG_TIMEOUT | |
572 | }; | |
573 | ||
574 | static const struct option options[] = { | |
575 | { "help", no_argument, NULL, 'h' }, | |
576 | { "files-max", required_argument, NULL, ARG_FILES_MAX }, | |
577 | { "file-size-max", required_argument, NULL, ARG_FILE_SIZE_MAX }, | |
578 | { "timeout", required_argument, NULL, ARG_TIMEOUT }, | |
579 | { NULL, 0, NULL, 0 } | |
580 | }; | |
581 | ||
582 | int c; | |
583 | ||
584 | assert(argc >= 0); | |
585 | assert(argv); | |
586 | ||
587 | while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0) { | |
588 | ||
589 | switch (c) { | |
590 | ||
591 | case 'h': | |
592 | help(); | |
593 | return 0; | |
594 | ||
595 | case ARG_FILES_MAX: | |
596 | if (safe_atou(optarg, &arg_files_max) < 0 || arg_files_max <= 0) { | |
597 | log_error("Failed to parse maximum number of files %s.", optarg); | |
598 | return -EINVAL; | |
599 | } | |
600 | break; | |
601 | ||
602 | case ARG_FILE_SIZE_MAX: { | |
603 | unsigned long long ull; | |
604 | ||
605 | if (safe_atollu(optarg, &ull) < 0 || ull <= 0) { | |
606 | log_error("Failed to parse maximum file size %s.", optarg); | |
607 | return -EINVAL; | |
608 | } | |
609 | ||
610 | arg_file_size_max = (off_t) ull; | |
611 | break; | |
612 | } | |
613 | ||
614 | case ARG_TIMEOUT: | |
615 | if (parse_usec(optarg, &arg_timeout) < 0 || arg_timeout <= 0) { | |
616 | log_error("Failed to parse timeout %s.", optarg); | |
617 | return -EINVAL; | |
618 | } | |
619 | ||
620 | break; | |
621 | ||
622 | case '?': | |
623 | return -EINVAL; | |
624 | ||
625 | default: | |
626 | log_error("Unknown option code %c", c); | |
627 | return -EINVAL; | |
628 | } | |
629 | } | |
630 | ||
631 | if (optind != argc && | |
632 | optind != argc-1) { | |
633 | help(); | |
634 | return -EINVAL; | |
635 | } | |
636 | ||
637 | return 1; | |
638 | } | |
639 | ||
22be093f | 640 | int main(int argc, char *argv[]) { |
8260358d | 641 | int r; |
4030d7a9 | 642 | |
c1480dae | 643 | log_set_target(LOG_TARGET_SYSLOG_OR_KMSG); |
22be093f LP |
644 | log_parse_environment(); |
645 | log_open(); | |
646 | ||
8260358d LP |
647 | if ((r = parse_argv(argc, argv)) <= 0) |
648 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; | |
649 | ||
41a598e2 LP |
650 | if (!enough_ram()) { |
651 | log_info("Disabling readahead collector due to low memory."); | |
652 | return 0; | |
653 | } | |
654 | ||
07faed4f LP |
655 | if (detect_virtualization(NULL) > 0) { |
656 | log_info("Disabling readahead collector due to execution in virtualized environment."); | |
46a08e38 LP |
657 | return 0; |
658 | } | |
659 | ||
d9c7a87b LP |
660 | if (!(shared = shared_get())) |
661 | return 1; | |
662 | ||
663 | shared->collect = getpid(); | |
664 | __sync_synchronize(); | |
665 | ||
8260358d | 666 | if (collect(optind < argc ? argv[optind] : "/") < 0) |
22be093f LP |
667 | return 1; |
668 | ||
669 | return 0; | |
670 | } |