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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 | |
5430f7f2 LP |
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 | |
22be093f LP |
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 | |
5430f7f2 | 16 | Lesser General Public License for more details. |
22be093f | 17 | |
5430f7f2 | 18 | You should have received a copy of the GNU Lesser General Public License |
22be093f LP |
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> |
94243ef2 | 45 | #include <math.h> |
22be093f | 46 | |
a8348796 LP |
47 | #ifdef HAVE_FANOTIFY_INIT |
48 | #include <sys/fanotify.h> | |
49 | #endif | |
50 | ||
81527be1 LP |
51 | #include <systemd/sd-daemon.h> |
52 | ||
22be093f LP |
53 | #include "missing.h" |
54 | #include "util.h" | |
55 | #include "set.h" | |
22be093f LP |
56 | #include "ioprio.h" |
57 | #include "readahead-common.h" | |
b52aae1d | 58 | #include "virt.h" |
22be093f | 59 | |
41a598e2 LP |
60 | /* fixme: |
61 | * | |
408b85df | 62 | * - detect ssd on btrfs/lvm... |
41a598e2 | 63 | * - read ahead directories |
408b85df | 64 | * - gzip? |
8260358d | 65 | * - remount rw? |
6624768c | 66 | * - handle files where nothing is in mincore |
408b85df | 67 | * - does ioprio_set work with fadvise()? |
41a598e2 LP |
68 | */ |
69 | ||
d9c7a87b | 70 | static ReadaheadShared *shared = NULL; |
b0640287 | 71 | static usec_t starttime; |
d9c7a87b | 72 | |
2e7485f0 LP |
73 | /* Avoid collisions with the NULL pointer */ |
74 | #define SECTOR_TO_PTR(s) ULONG_TO_PTR((s)+1) | |
75 | #define PTR_TO_SECTOR(p) (PTR_TO_ULONG(p)-1) | |
76 | ||
746f8906 | 77 | static int btrfs_defrag(int fd) { |
b92bea5d | 78 | struct btrfs_ioctl_vol_args data = { .fd = fd }; |
22be093f | 79 | |
746f8906 LP |
80 | return ioctl(fd, BTRFS_IOC_DEFRAG, &data); |
81 | } | |
82 | ||
83 | static int pack_file(FILE *pack, const char *fn, bool on_btrfs) { | |
22be093f LP |
84 | struct stat st; |
85 | void *start = MAP_FAILED; | |
8260358d | 86 | uint8_t *vec; |
22be093f | 87 | uint32_t b, c; |
189455ab | 88 | uint64_t inode; |
22be093f LP |
89 | size_t l, pages; |
90 | bool mapped; | |
91 | int r = 0, fd = -1, k; | |
92 | ||
93 | assert(pack); | |
94 | assert(fn); | |
95 | ||
189455ab LP |
96 | fd = open(fn, O_RDONLY|O_CLOEXEC|O_NOATIME|O_NOCTTY|O_NOFOLLOW); |
97 | if (fd < 0) { | |
a78899f5 LP |
98 | |
99 | if (errno == ENOENT) | |
100 | return 0; | |
101 | ||
a76fad09 LP |
102 | if (errno == EPERM || errno == EACCES) |
103 | return 0; | |
104 | ||
22be093f LP |
105 | log_warning("open(%s) failed: %m", fn); |
106 | r = -errno; | |
107 | goto finish; | |
108 | } | |
109 | ||
189455ab LP |
110 | k = file_verify(fd, fn, arg_file_size_max, &st); |
111 | if (k <= 0) { | |
22be093f LP |
112 | r = k; |
113 | goto finish; | |
114 | } | |
115 | ||
746f8906 LP |
116 | if (on_btrfs) |
117 | btrfs_defrag(fd); | |
118 | ||
22be093f | 119 | l = PAGE_ALIGN(st.st_size); |
189455ab LP |
120 | start = mmap(NULL, l, PROT_READ, MAP_SHARED, fd, 0); |
121 | if (start == MAP_FAILED) { | |
22be093f LP |
122 | log_warning("mmap(%s) failed: %m", fn); |
123 | r = -errno; | |
124 | goto finish; | |
125 | } | |
126 | ||
37f85e66 | 127 | pages = l / page_size(); |
8260358d | 128 | vec = alloca(pages); |
37f85e66 | 129 | memset(vec, 0, pages); |
22be093f LP |
130 | if (mincore(start, l, vec) < 0) { |
131 | log_warning("mincore(%s) failed: %m", fn); | |
132 | r = -errno; | |
133 | goto finish; | |
134 | } | |
135 | ||
136 | fputs(fn, pack); | |
137 | fputc('\n', pack); | |
138 | ||
189455ab LP |
139 | /* Store the inode, so that we notice when the file is deleted */ |
140 | inode = (uint64_t) st.st_ino; | |
141 | fwrite(&inode, sizeof(inode), 1, pack); | |
142 | ||
22be093f LP |
143 | mapped = false; |
144 | for (c = 0; c < pages; c++) { | |
408b85df | 145 | bool new_mapped = !!(vec[c] & 1); |
22be093f LP |
146 | |
147 | if (!mapped && new_mapped) | |
148 | b = c; | |
149 | else if (mapped && !new_mapped) { | |
150 | fwrite(&b, sizeof(b), 1, pack); | |
151 | fwrite(&c, sizeof(c), 1, pack); | |
152 | ||
153 | log_debug("%s: page %u to %u", fn, b, c); | |
154 | } | |
155 | ||
156 | mapped = new_mapped; | |
157 | } | |
158 | ||
159 | /* We don't write any range data if we should read the entire file */ | |
160 | if (mapped && b > 0) { | |
161 | fwrite(&b, sizeof(b), 1, pack); | |
162 | fwrite(&c, sizeof(c), 1, pack); | |
163 | ||
164 | log_debug("%s: page %u to %u", fn, b, c); | |
165 | } | |
166 | ||
167 | /* End marker */ | |
168 | b = 0; | |
169 | fwrite(&b, sizeof(b), 1, pack); | |
170 | fwrite(&b, sizeof(b), 1, pack); | |
171 | ||
172 | finish: | |
173 | if (start != MAP_FAILED) | |
174 | munmap(start, l); | |
175 | ||
176 | if (fd >= 0) | |
177 | close_nointr_nofail(fd); | |
178 | ||
179 | return r; | |
180 | } | |
181 | ||
182 | static unsigned long fd_first_block(int fd) { | |
183 | struct { | |
184 | struct fiemap fiemap; | |
185 | struct fiemap_extent extent; | |
b92bea5d ZJS |
186 | } data = { |
187 | .fiemap.fm_length = ~0ULL, | |
188 | .fiemap.fm_extent_count = 1, | |
189 | }; | |
22be093f LP |
190 | |
191 | if (ioctl(fd, FS_IOC_FIEMAP, &data) < 0) | |
192 | return 0; | |
193 | ||
194 | if (data.fiemap.fm_mapped_extents <= 0) | |
195 | return 0; | |
196 | ||
197 | if (data.fiemap.fm_extents[0].fe_flags & FIEMAP_EXTENT_UNKNOWN) | |
198 | return 0; | |
199 | ||
200 | return (unsigned long) data.fiemap.fm_extents[0].fe_physical; | |
201 | } | |
202 | ||
203 | struct item { | |
204 | const char *path; | |
205 | unsigned long block; | |
94243ef2 | 206 | unsigned long bin; |
22be093f LP |
207 | }; |
208 | ||
209 | static int qsort_compare(const void *a, const void *b) { | |
210 | const struct item *i, *j; | |
211 | ||
212 | i = a; | |
213 | j = b; | |
214 | ||
94243ef2 AK |
215 | /* sort by bin first */ |
216 | if (i->bin < j->bin) | |
217 | return -1; | |
218 | if (i->bin > j->bin) | |
219 | return 1; | |
220 | ||
221 | /* then sort by sector */ | |
22be093f LP |
222 | if (i->block < j->block) |
223 | return -1; | |
224 | if (i->block > j->block) | |
225 | return 1; | |
226 | ||
227 | return strcmp(i->path, j->path); | |
228 | } | |
229 | ||
230 | static int collect(const char *root) { | |
231 | enum { | |
858209c5 | 232 | FD_FANOTIFY, /* Get the actual fs events */ |
22be093f | 233 | FD_SIGNAL, |
6624768c | 234 | FD_INOTIFY, /* We get notifications to quit early via this fd */ |
22be093f LP |
235 | _FD_MAX |
236 | }; | |
b92bea5d | 237 | struct pollfd pollfd[_FD_MAX] = {}; |
6624768c | 238 | int fanotify_fd = -1, signal_fd = -1, inotify_fd = -1, r = 0; |
22be093f LP |
239 | pid_t my_pid; |
240 | Hashmap *files = NULL; | |
241 | Iterator i; | |
242 | char *p, *q; | |
243 | sigset_t mask; | |
244 | FILE *pack = NULL; | |
245 | char *pack_fn_new = NULL, *pack_fn = NULL; | |
746f8906 LP |
246 | bool on_ssd, on_btrfs; |
247 | struct statfs sfs; | |
408b85df | 248 | usec_t not_after; |
6de338a2 LP |
249 | uint64_t previous_block_readahead; |
250 | bool previous_block_readahead_set = false; | |
22be093f LP |
251 | |
252 | assert(root); | |
253 | ||
6de338a2 | 254 | if (asprintf(&pack_fn, "%s/.readahead", root) < 0) { |
0d0f0c50 | 255 | r = log_oom(); |
6de338a2 LP |
256 | goto finish; |
257 | } | |
258 | ||
b0640287 | 259 | starttime = now(CLOCK_MONOTONIC); |
94243ef2 | 260 | |
6de338a2 LP |
261 | /* If there's no pack file yet we lower the kernel readahead |
262 | * so that mincore() is accurate. If there is a pack file | |
263 | * already we assume it is accurate enough so that kernel | |
264 | * readahead is never triggered. */ | |
265 | previous_block_readahead_set = | |
266 | access(pack_fn, F_OK) < 0 && | |
267 | block_get_readahead(root, &previous_block_readahead) >= 0 && | |
268 | block_set_readahead(root, 8*1024) >= 0; | |
269 | ||
22be093f LP |
270 | if (ioprio_set(IOPRIO_WHO_PROCESS, getpid(), IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0)) < 0) |
271 | log_warning("Failed to set IDLE IO priority class: %m"); | |
272 | ||
273 | assert_se(sigemptyset(&mask) == 0); | |
274 | sigset_add_many(&mask, SIGINT, SIGTERM, -1); | |
275 | assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0); | |
276 | ||
277 | if ((signal_fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC)) < 0) { | |
278 | log_error("signalfd(): %m"); | |
279 | r = -errno; | |
280 | goto finish; | |
281 | } | |
282 | ||
e62d8c39 ZJS |
283 | files = hashmap_new(string_hash_func, string_compare_func); |
284 | if (!files) { | |
22be093f LP |
285 | log_error("Failed to allocate set."); |
286 | r = -ENOMEM; | |
287 | goto finish; | |
288 | } | |
289 | ||
7989e1f2 | 290 | fanotify_fd = fanotify_init(FAN_CLOEXEC|FAN_NONBLOCK, O_RDONLY|O_LARGEFILE|O_CLOEXEC|O_NOATIME); |
e62d8c39 | 291 | if (fanotify_fd < 0) { |
22be093f LP |
292 | log_error("Failed to create fanotify object: %m"); |
293 | r = -errno; | |
294 | goto finish; | |
295 | } | |
296 | ||
297 | if (fanotify_mark(fanotify_fd, FAN_MARK_ADD|FAN_MARK_MOUNT, FAN_OPEN, AT_FDCWD, root) < 0) { | |
298 | log_error("Failed to mark %s: %m", root); | |
299 | r = -errno; | |
300 | goto finish; | |
301 | } | |
302 | ||
e62d8c39 ZJS |
303 | inotify_fd = open_inotify(); |
304 | if (inotify_fd < 0) { | |
6624768c LP |
305 | r = inotify_fd; |
306 | goto finish; | |
307 | } | |
308 | ||
8260358d | 309 | not_after = now(CLOCK_MONOTONIC) + arg_timeout; |
408b85df | 310 | |
22be093f LP |
311 | my_pid = getpid(); |
312 | ||
22be093f LP |
313 | pollfd[FD_FANOTIFY].fd = fanotify_fd; |
314 | pollfd[FD_FANOTIFY].events = POLLIN; | |
315 | pollfd[FD_SIGNAL].fd = signal_fd; | |
316 | pollfd[FD_SIGNAL].events = POLLIN; | |
6624768c LP |
317 | pollfd[FD_INOTIFY].fd = inotify_fd; |
318 | pollfd[FD_INOTIFY].events = POLLIN; | |
22be093f LP |
319 | |
320 | sd_notify(0, | |
321 | "READY=1\n" | |
322 | "STATUS=Collecting readahead data"); | |
323 | ||
324 | log_debug("Collecting..."); | |
325 | ||
2b583ce6 | 326 | if (access("/run/systemd/readahead/cancel", F_OK) >= 0) { |
6624768c LP |
327 | log_debug("Collection canceled"); |
328 | r = -ECANCELED; | |
329 | goto finish; | |
330 | } | |
331 | ||
2b583ce6 | 332 | if (access("/run/systemd/readahead/done", F_OK) >= 0) { |
6624768c LP |
333 | log_debug("Got termination request"); |
334 | goto done; | |
335 | } | |
336 | ||
22be093f LP |
337 | for (;;) { |
338 | union { | |
339 | struct fanotify_event_metadata metadata; | |
340 | char buffer[4096]; | |
341 | } data; | |
342 | ssize_t n; | |
343 | struct fanotify_event_metadata *m; | |
408b85df LP |
344 | usec_t t; |
345 | int h; | |
22be093f | 346 | |
8260358d | 347 | if (hashmap_size(files) > arg_files_max) { |
408b85df | 348 | log_debug("Reached maximum number of read ahead files, ending collection."); |
6e3eb5ba | 349 | break; |
408b85df LP |
350 | } |
351 | ||
352 | t = now(CLOCK_MONOTONIC); | |
353 | if (t >= not_after) { | |
354 | log_debug("Reached maximum collection time, ending collection."); | |
355 | break; | |
356 | } | |
6e3eb5ba | 357 | |
408b85df | 358 | if ((h = poll(pollfd, _FD_MAX, (int) ((not_after - t) / USEC_PER_MSEC))) < 0) { |
22be093f LP |
359 | |
360 | if (errno == EINTR) | |
361 | continue; | |
362 | ||
363 | log_error("poll(): %m"); | |
364 | r = -errno; | |
365 | goto finish; | |
366 | } | |
367 | ||
408b85df LP |
368 | if (h == 0) { |
369 | log_debug("Reached maximum collection time, ending collection."); | |
370 | break; | |
371 | } | |
372 | ||
6624768c LP |
373 | if (pollfd[FD_SIGNAL].revents) { |
374 | log_debug("Got signal."); | |
375 | break; | |
376 | } | |
377 | ||
378 | if (pollfd[FD_INOTIFY].revents) { | |
379 | uint8_t inotify_buffer[sizeof(struct inotify_event) + FILENAME_MAX]; | |
380 | struct inotify_event *e; | |
381 | ||
382 | if ((n = read(inotify_fd, &inotify_buffer, sizeof(inotify_buffer))) < 0) { | |
383 | if (errno == EINTR || errno == EAGAIN) | |
384 | continue; | |
385 | ||
386 | log_error("Failed to read inotify event: %m"); | |
387 | r = -errno; | |
388 | goto finish; | |
389 | } | |
390 | ||
391 | e = (struct inotify_event*) inotify_buffer; | |
392 | while (n > 0) { | |
393 | size_t step; | |
394 | ||
395 | if ((e->mask & IN_CREATE) && streq(e->name, "cancel")) { | |
396 | log_debug("Collection canceled"); | |
397 | r = -ECANCELED; | |
398 | goto finish; | |
399 | } | |
400 | ||
401 | if ((e->mask & IN_CREATE) && streq(e->name, "done")) { | |
402 | log_debug("Got termination request"); | |
403 | goto done; | |
404 | } | |
405 | ||
406 | step = sizeof(struct inotify_event) + e->len; | |
407 | assert(step <= (size_t) n); | |
408 | ||
409 | e = (struct inotify_event*) ((uint8_t*) e + step); | |
410 | n -= step; | |
411 | } | |
412 | } | |
413 | ||
22be093f LP |
414 | if ((n = read(fanotify_fd, &data, sizeof(data))) < 0) { |
415 | ||
cf37e246 LP |
416 | if (errno == EINTR || errno == EAGAIN) |
417 | continue; | |
418 | ||
419 | /* fanotify sometimes returns EACCES on read() | |
420 | * where it shouldn't. For now let's just | |
421 | * ignore it here (which is safe), but | |
422 | * eventually this should be | |
423 | * dropped when the kernel is fixed. | |
424 | * | |
425 | * https://bugzilla.redhat.com/show_bug.cgi?id=707577 */ | |
426 | if (errno == EACCES) | |
22be093f LP |
427 | continue; |
428 | ||
429 | log_error("Failed to read event: %m"); | |
430 | r = -errno; | |
431 | goto finish; | |
432 | } | |
433 | ||
408b85df | 434 | for (m = &data.metadata; FAN_EVENT_OK(m, n); m = FAN_EVENT_NEXT(m, n)) { |
d9c7a87b LP |
435 | char fn[PATH_MAX]; |
436 | int k; | |
22be093f | 437 | |
d9c7a87b LP |
438 | if (m->fd < 0) |
439 | goto next_iteration; | |
22be093f | 440 | |
d9c7a87b LP |
441 | if (m->pid == my_pid) |
442 | goto next_iteration; | |
22be093f | 443 | |
d9c7a87b LP |
444 | __sync_synchronize(); |
445 | if (m->pid == shared->replay) | |
446 | goto next_iteration; | |
22be093f | 447 | |
d9c7a87b LP |
448 | snprintf(fn, sizeof(fn), "/proc/self/fd/%i", m->fd); |
449 | char_array_0(fn); | |
450 | ||
451 | if ((k = readlink_malloc(fn, &p)) >= 0) { | |
d9c7a87b | 452 | if (startswith(p, "/tmp") || |
0840ce2d | 453 | endswith(p, " (deleted)") || |
d9c7a87b LP |
454 | hashmap_get(files, p)) |
455 | /* Not interesting, or | |
456 | * already read */ | |
457 | free(p); | |
458 | else { | |
459 | unsigned long ul; | |
b0640287 | 460 | usec_t entrytime; |
94243ef2 AK |
461 | struct item *entry; |
462 | ||
463 | entry = new0(struct item, 1); | |
b0640287 AK |
464 | if (!entry) { |
465 | r = log_oom(); | |
466 | goto finish; | |
467 | } | |
22be093f | 468 | |
d9c7a87b LP |
469 | ul = fd_first_block(m->fd); |
470 | ||
b0640287 | 471 | entrytime = now(CLOCK_MONOTONIC); |
94243ef2 AK |
472 | |
473 | entry->block = ul; | |
474 | entry->path = strdup(p); | |
b0640287 AK |
475 | if (!entry->path) { |
476 | free(entry); | |
477 | r = log_oom(); | |
478 | goto finish; | |
479 | } | |
480 | entry->bin = (entrytime - starttime) / 2000000; | |
94243ef2 AK |
481 | |
482 | if ((k = hashmap_put(files, p, entry)) < 0) { | |
d9c7a87b LP |
483 | log_warning("set_put() failed: %s", strerror(-k)); |
484 | free(p); | |
22be093f | 485 | } |
d9c7a87b | 486 | } |
22be093f | 487 | |
d9c7a87b LP |
488 | } else |
489 | log_warning("readlink(%s) failed: %s", fn, strerror(-k)); | |
22be093f | 490 | |
d9c7a87b | 491 | next_iteration: |
c4b996bd | 492 | if (m->fd >= 0) |
22be093f | 493 | close_nointr_nofail(m->fd); |
22be093f | 494 | } |
22be093f LP |
495 | } |
496 | ||
6624768c | 497 | done: |
22be093f LP |
498 | if (fanotify_fd >= 0) { |
499 | close_nointr_nofail(fanotify_fd); | |
500 | fanotify_fd = -1; | |
501 | } | |
502 | ||
503 | log_debug("Writing Pack File..."); | |
504 | ||
55888fa4 | 505 | on_ssd = fs_on_ssd(root) > 0; |
22be093f LP |
506 | log_debug("On SSD: %s", yes_no(on_ssd)); |
507 | ||
aea275c4 | 508 | on_btrfs = statfs(root, &sfs) >= 0 && F_TYPE_CMP(sfs.f_type, BTRFS_SUPER_MAGIC); |
746f8906 LP |
509 | log_debug("On btrfs: %s", yes_no(on_btrfs)); |
510 | ||
6de338a2 | 511 | if (asprintf(&pack_fn_new, "%s/.readahead.new", root) < 0) { |
0d0f0c50 | 512 | r = log_oom(); |
22be093f LP |
513 | goto finish; |
514 | } | |
515 | ||
189455ab LP |
516 | pack = fopen(pack_fn_new, "we"); |
517 | if (!pack) { | |
22be093f LP |
518 | log_error("Failed to open pack file: %m"); |
519 | r = -errno; | |
520 | goto finish; | |
521 | } | |
522 | ||
cae544bc | 523 | fputs(CANONICAL_HOST READAHEAD_PACK_FILE_VERSION, pack); |
22be093f LP |
524 | putc(on_ssd ? 'S' : 'R', pack); |
525 | ||
746f8906 | 526 | if (on_ssd || on_btrfs) { |
22be093f | 527 | |
746f8906 | 528 | /* On SSD or on btrfs, just write things out in the |
41a598e2 | 529 | * order the files were accessed. */ |
22be093f LP |
530 | |
531 | HASHMAP_FOREACH_KEY(q, p, files, i) | |
746f8906 | 532 | pack_file(pack, p, on_btrfs); |
22be093f LP |
533 | } else { |
534 | struct item *ordered, *j; | |
535 | unsigned k, n; | |
536 | ||
537 | /* On rotating media, order things by the block | |
538 | * numbers */ | |
539 | ||
540 | log_debug("Ordering..."); | |
541 | ||
542 | n = hashmap_size(files); | |
543 | if (!(ordered = new(struct item, n))) { | |
0d0f0c50 | 544 | r = log_oom(); |
22be093f LP |
545 | goto finish; |
546 | } | |
547 | ||
548 | j = ordered; | |
549 | HASHMAP_FOREACH_KEY(q, p, files, i) { | |
94243ef2 | 550 | memcpy(j, q, sizeof(struct item)); |
22be093f LP |
551 | j++; |
552 | } | |
553 | ||
554 | assert(ordered + n == j); | |
555 | ||
556 | qsort(ordered, n, sizeof(struct item), qsort_compare); | |
557 | ||
558 | for (k = 0; k < n; k++) | |
746f8906 | 559 | pack_file(pack, ordered[k].path, on_btrfs); |
22be093f LP |
560 | |
561 | free(ordered); | |
562 | } | |
563 | ||
564 | log_debug("Finalizing..."); | |
565 | ||
566 | fflush(pack); | |
567 | ||
568 | if (ferror(pack)) { | |
569 | log_error("Failed to write pack file."); | |
570 | r = -EIO; | |
571 | goto finish; | |
572 | } | |
573 | ||
574 | if (rename(pack_fn_new, pack_fn) < 0) { | |
575 | log_error("Failed to rename readahead file: %m"); | |
576 | r = -errno; | |
577 | goto finish; | |
578 | } | |
579 | ||
580 | fclose(pack); | |
581 | pack = NULL; | |
582 | ||
583 | log_debug("Done."); | |
584 | ||
585 | finish: | |
586 | if (fanotify_fd >= 0) | |
587 | close_nointr_nofail(fanotify_fd); | |
588 | ||
589 | if (signal_fd >= 0) | |
590 | close_nointr_nofail(signal_fd); | |
591 | ||
6624768c LP |
592 | if (inotify_fd >= 0) |
593 | close_nointr_nofail(inotify_fd); | |
594 | ||
22be093f LP |
595 | if (pack) { |
596 | fclose(pack); | |
597 | unlink(pack_fn_new); | |
598 | } | |
22be093f LP |
599 | free(pack_fn_new); |
600 | free(pack_fn); | |
601 | ||
602 | while ((p = hashmap_steal_first_key(files))) | |
f0cf061e | 603 | free(p); |
22be093f LP |
604 | |
605 | hashmap_free(files); | |
606 | ||
6de338a2 LP |
607 | if (previous_block_readahead_set) { |
608 | uint64_t bytes; | |
609 | ||
610 | /* Restore the original kernel readahead setting if we | |
611 | * changed it, and nobody has overwritten it since | |
612 | * yet. */ | |
613 | if (block_get_readahead(root, &bytes) >= 0 && bytes == 8*1024) | |
614 | block_set_readahead(root, previous_block_readahead); | |
615 | } | |
616 | ||
22be093f LP |
617 | return r; |
618 | } | |
619 | ||
87ce22cc | 620 | int main_collect(const char *root) { |
8260358d | 621 | |
87ce22cc LP |
622 | if (!root) |
623 | root = "/"; | |
2b590e13 | 624 | |
3b2d5b02 LP |
625 | /* Skip this step on read-only media. Note that we check the |
626 | * underlying block device here, not he read-only flag of the | |
627 | * file system on top, since that one is most likely mounted | |
628 | * read-only anyway at boot, even if the underlying block | |
629 | * device is theoretically writable. */ | |
2b590e13 LP |
630 | if (fs_on_read_only(root) > 0) { |
631 | log_info("Disabling readahead collector due to read-only media."); | |
87ce22cc | 632 | return EXIT_SUCCESS; |
2b590e13 LP |
633 | } |
634 | ||
41a598e2 LP |
635 | if (!enough_ram()) { |
636 | log_info("Disabling readahead collector due to low memory."); | |
87ce22cc | 637 | return EXIT_SUCCESS; |
41a598e2 LP |
638 | } |
639 | ||
3b2d5b02 LP |
640 | shared = shared_get(); |
641 | if (!shared) | |
87ce22cc | 642 | return EXIT_FAILURE; |
d9c7a87b LP |
643 | |
644 | shared->collect = getpid(); | |
645 | __sync_synchronize(); | |
646 | ||
2b590e13 | 647 | if (collect(root) < 0) |
87ce22cc | 648 | return EXIT_FAILURE; |
22be093f | 649 | |
87ce22cc | 650 | return EXIT_SUCCESS; |
22be093f | 651 | } |