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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 | |
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> | |
8260358d | 35 | #include <getopt.h> |
6624768c | 36 | #include <sys/inotify.h> |
22be093f | 37 | |
81527be1 LP |
38 | #include <systemd/sd-daemon.h> |
39 | ||
22be093f LP |
40 | #include "missing.h" |
41 | #include "util.h" | |
42 | #include "set.h" | |
22be093f LP |
43 | #include "ioprio.h" |
44 | #include "readahead-common.h" | |
b52aae1d | 45 | #include "virt.h" |
22be093f | 46 | |
8260358d LP |
47 | static off_t arg_file_size_max = READAHEAD_FILE_SIZE_MAX; |
48 | ||
d9c7a87b LP |
49 | static ReadaheadShared *shared = NULL; |
50 | ||
22be093f LP |
51 | static int unpack_file(FILE *pack) { |
52 | char fn[PATH_MAX]; | |
53 | int r = 0, fd = -1; | |
54 | bool any = false; | |
55 | struct stat st; | |
56 | ||
57 | assert(pack); | |
58 | ||
59 | if (!fgets(fn, sizeof(fn), pack)) | |
60 | return 0; | |
61 | ||
62 | char_array_0(fn); | |
63 | truncate_nl(fn); | |
64 | ||
a78899f5 LP |
65 | if ((fd = open(fn, O_RDONLY|O_CLOEXEC|O_NOATIME|O_NOCTTY|O_NOFOLLOW)) < 0) { |
66 | ||
a76fad09 | 67 | if (errno != ENOENT && errno != EPERM && errno != EACCES) |
a78899f5 LP |
68 | log_warning("open(%s) failed: %m", fn); |
69 | ||
70 | } else if (file_verify(fd, fn, arg_file_size_max, &st) <= 0) { | |
22be093f LP |
71 | close_nointr_nofail(fd); |
72 | fd = -1; | |
73 | } | |
74 | ||
75 | for (;;) { | |
76 | uint32_t b, c; | |
77 | ||
78 | if (fread(&b, sizeof(b), 1, pack) != 1 || | |
79 | fread(&c, sizeof(c), 1, pack) != 1) { | |
80 | log_error("Premature end of pack file."); | |
81 | r = -EIO; | |
82 | goto finish; | |
83 | } | |
84 | ||
85 | if (b == 0 && c == 0) | |
86 | break; | |
87 | ||
88 | if (c <= b) { | |
89 | log_error("Invalid pack file."); | |
90 | r = -EIO; | |
91 | goto finish; | |
92 | } | |
93 | ||
94 | log_debug("%s: page %u to %u", fn, b, c); | |
95 | ||
96 | any = true; | |
97 | ||
98 | if (fd >= 0) | |
37f85e66 | 99 | if (posix_fadvise(fd, b * page_size(), (c - b) * page_size(), POSIX_FADV_WILLNEED) < 0) { |
6e66797a | 100 | log_warning("posix_fadvise() failed: %m"); |
22be093f LP |
101 | goto finish; |
102 | } | |
103 | } | |
104 | ||
105 | if (!any && fd >= 0) { | |
106 | /* if no range is encoded in the pack file this is | |
107 | * intended to mean that the whole file shall be | |
108 | * read */ | |
109 | ||
6e66797a HH |
110 | if (posix_fadvise(fd, 0, st.st_size, POSIX_FADV_WILLNEED) < 0) { |
111 | log_warning("posix_fadvise() failed: %m"); | |
22be093f LP |
112 | goto finish; |
113 | } | |
114 | } | |
115 | ||
116 | finish: | |
117 | if (fd >= 0) | |
118 | close_nointr_nofail(fd); | |
119 | ||
120 | return r; | |
121 | } | |
122 | ||
123 | static int replay(const char *root) { | |
858209c5 | 124 | FILE *pack = NULL; |
22be093f LP |
125 | char line[LINE_MAX]; |
126 | int r = 0; | |
da19d5c1 LP |
127 | char *pack_fn = NULL; |
128 | int c; | |
902a339c | 129 | bool on_ssd, ready = false; |
22be093f | 130 | int prio; |
6624768c | 131 | int inotify_fd = -1; |
22be093f LP |
132 | |
133 | assert(root); | |
134 | ||
75a010e0 | 135 | write_one_line_file("/proc/self/oom_score_adj", "1000"); |
de58283f | 136 | bump_request_nr(root); |
75a010e0 | 137 | |
22be093f LP |
138 | if (asprintf(&pack_fn, "%s/.readahead", root) < 0) { |
139 | log_error("Out of memory"); | |
140 | r = -ENOMEM; | |
141 | goto finish; | |
142 | } | |
143 | ||
144 | if ((!(pack = fopen(pack_fn, "re")))) { | |
a78899f5 | 145 | if (errno == ENOENT) |
22be093f LP |
146 | log_debug("No pack file found."); |
147 | else { | |
148 | log_error("Failed to open pack file: %m"); | |
149 | r = -errno; | |
150 | } | |
151 | ||
152 | goto finish; | |
153 | } | |
154 | ||
bdb0e14d LP |
155 | posix_fadvise(fileno(pack), 0, 0, POSIX_FADV_WILLNEED); |
156 | ||
6624768c LP |
157 | if ((inotify_fd = open_inotify()) < 0) { |
158 | r = inotify_fd; | |
159 | goto finish; | |
160 | } | |
161 | ||
22be093f LP |
162 | if (!(fgets(line, sizeof(line), pack))) { |
163 | log_error("Premature end of pack file."); | |
164 | r = -EIO; | |
165 | goto finish; | |
166 | } | |
167 | ||
168 | char_array_0(line); | |
169 | ||
170 | if (!streq(line, CANONICAL_HOST "\n")) { | |
171 | log_debug("Pack file host type mismatch."); | |
172 | goto finish; | |
173 | } | |
174 | ||
175 | if ((c = getc(pack)) == EOF) { | |
176 | log_debug("Premature end of pack file."); | |
177 | r = -EIO; | |
178 | goto finish; | |
179 | } | |
180 | ||
181 | /* We do not retest SSD here, so that we can start replaying | |
182 | * before udev is up.*/ | |
183 | on_ssd = c == 'S'; | |
184 | log_debug("On SSD: %s", yes_no(on_ssd)); | |
185 | ||
186 | if (on_ssd) | |
187 | prio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0); | |
188 | else | |
189 | prio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_RT, 7); | |
190 | ||
191 | if (ioprio_set(IOPRIO_WHO_PROCESS, getpid(), prio) < 0) | |
192 | log_warning("Failed to set IDLE IO priority class: %m"); | |
193 | ||
902a339c | 194 | sd_notify(0, "STATUS=Replaying readahead data"); |
22be093f LP |
195 | |
196 | log_debug("Replaying..."); | |
197 | ||
2b583ce6 | 198 | if (access("/run/systemd/readahead/noreplay", F_OK) >= 0) { |
6624768c LP |
199 | log_debug("Got termination request"); |
200 | goto done; | |
201 | } | |
202 | ||
22be093f | 203 | while (!feof(pack) && !ferror(pack)) { |
6624768c | 204 | uint8_t inotify_buffer[sizeof(struct inotify_event) + FILENAME_MAX]; |
22be093f | 205 | int k; |
6624768c LP |
206 | ssize_t n; |
207 | ||
208 | if ((n = read(inotify_fd, &inotify_buffer, sizeof(inotify_buffer))) < 0) { | |
209 | if (errno != EINTR && errno != EAGAIN) { | |
210 | log_error("Failed to read inotify event: %m"); | |
211 | r = -errno; | |
212 | goto finish; | |
213 | } | |
214 | } else { | |
215 | struct inotify_event *e = (struct inotify_event*) inotify_buffer; | |
216 | ||
217 | while (n > 0) { | |
218 | size_t step; | |
219 | ||
220 | if ((e->mask & IN_CREATE) && streq(e->name, "noreplay")) { | |
221 | log_debug("Got termination request"); | |
222 | goto done; | |
223 | } | |
224 | ||
225 | step = sizeof(struct inotify_event) + e->len; | |
226 | assert(step <= (size_t) n); | |
227 | ||
228 | e = (struct inotify_event*) ((uint8_t*) e + step); | |
229 | n -= step; | |
230 | } | |
231 | } | |
22be093f LP |
232 | |
233 | if ((k = unpack_file(pack)) < 0) { | |
234 | r = k; | |
235 | goto finish; | |
236 | } | |
902a339c LP |
237 | |
238 | if (!ready) { | |
239 | /* We delay the ready notification until we | |
240 | * queued at least one read */ | |
241 | sd_notify(0, "READY=1"); | |
242 | ready = true; | |
243 | } | |
22be093f LP |
244 | } |
245 | ||
6624768c | 246 | done: |
902a339c LP |
247 | if (!ready) |
248 | sd_notify(0, "READY=1"); | |
249 | ||
22be093f LP |
250 | if (ferror(pack)) { |
251 | log_error("Failed to read pack file."); | |
252 | r = -EIO; | |
253 | goto finish; | |
254 | } | |
255 | ||
256 | log_debug("Done."); | |
257 | ||
258 | finish: | |
259 | if (pack) | |
260 | fclose(pack); | |
261 | ||
6624768c LP |
262 | if (inotify_fd >= 0) |
263 | close_nointr_nofail(inotify_fd); | |
264 | ||
22be093f LP |
265 | free(pack_fn); |
266 | ||
267 | return r; | |
268 | } | |
269 | ||
8260358d LP |
270 | |
271 | static int help(void) { | |
272 | ||
273 | printf("%s [OPTIONS...] [DIRECTORY]\n\n" | |
274 | "Replay collected read-ahead data on early boot.\n\n" | |
275 | " -h --help Show this help\n" | |
276 | " --max-file-size=BYTES Maximum size of files to read ahead\n", | |
277 | program_invocation_short_name); | |
278 | ||
279 | return 0; | |
280 | } | |
281 | ||
282 | static int parse_argv(int argc, char *argv[]) { | |
283 | ||
284 | enum { | |
285 | ARG_FILE_SIZE_MAX | |
286 | }; | |
287 | ||
288 | static const struct option options[] = { | |
289 | { "help", no_argument, NULL, 'h' }, | |
290 | { "file-size-max", required_argument, NULL, ARG_FILE_SIZE_MAX }, | |
291 | { NULL, 0, NULL, 0 } | |
292 | }; | |
293 | ||
294 | int c; | |
295 | ||
296 | assert(argc >= 0); | |
297 | assert(argv); | |
298 | ||
299 | while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0) { | |
300 | ||
301 | switch (c) { | |
302 | ||
303 | case 'h': | |
304 | help(); | |
305 | return 0; | |
306 | ||
307 | case ARG_FILE_SIZE_MAX: { | |
308 | unsigned long long ull; | |
309 | ||
310 | if (safe_atollu(optarg, &ull) < 0 || ull <= 0) { | |
311 | log_error("Failed to parse maximum file size %s.", optarg); | |
312 | return -EINVAL; | |
313 | } | |
314 | ||
315 | arg_file_size_max = (off_t) ull; | |
316 | break; | |
317 | } | |
318 | ||
319 | case '?': | |
320 | return -EINVAL; | |
321 | ||
322 | default: | |
323 | log_error("Unknown option code %c", c); | |
324 | return -EINVAL; | |
325 | } | |
326 | } | |
327 | ||
328 | if (optind != argc && | |
329 | optind != argc-1) { | |
330 | help(); | |
331 | return -EINVAL; | |
332 | } | |
333 | ||
334 | return 1; | |
335 | } | |
336 | ||
22be093f | 337 | int main(int argc, char*argv[]) { |
8260358d | 338 | int r; |
2b590e13 | 339 | const char *root; |
4030d7a9 | 340 | |
4cfa2c99 | 341 | log_set_target(LOG_TARGET_AUTO); |
22be093f LP |
342 | log_parse_environment(); |
343 | log_open(); | |
344 | ||
4c12626c LP |
345 | umask(0022); |
346 | ||
8260358d LP |
347 | if ((r = parse_argv(argc, argv)) <= 0) |
348 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; | |
349 | ||
2b590e13 LP |
350 | root = optind < argc ? argv[optind] : "/"; |
351 | ||
41a598e2 LP |
352 | if (!enough_ram()) { |
353 | log_info("Disabling readahead replay due to low memory."); | |
354 | return 0; | |
355 | } | |
356 | ||
07faed4f LP |
357 | if (detect_virtualization(NULL) > 0) { |
358 | log_info("Disabling readahead replay due to execution in virtualized environment."); | |
46a08e38 LP |
359 | return 0; |
360 | } | |
361 | ||
d9c7a87b LP |
362 | if (!(shared = shared_get())) |
363 | return 1; | |
364 | ||
365 | shared->replay = getpid(); | |
366 | __sync_synchronize(); | |
367 | ||
2b590e13 | 368 | if (replay(root) < 0) |
22be093f LP |
369 | return 1; |
370 | ||
371 | return 0; | |
372 | } |