]>
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 | |
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> | |
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; | |
189455ab | 56 | uint64_t inode; |
22be093f LP |
57 | |
58 | assert(pack); | |
59 | ||
60 | if (!fgets(fn, sizeof(fn), pack)) | |
61 | return 0; | |
62 | ||
63 | char_array_0(fn); | |
64 | truncate_nl(fn); | |
65 | ||
189455ab LP |
66 | fd = open(fn, O_RDONLY|O_CLOEXEC|O_NOATIME|O_NOCTTY|O_NOFOLLOW); |
67 | if (fd < 0) { | |
a78899f5 | 68 | |
a76fad09 | 69 | if (errno != ENOENT && errno != EPERM && errno != EACCES) |
a78899f5 LP |
70 | log_warning("open(%s) failed: %m", fn); |
71 | ||
72 | } else if (file_verify(fd, fn, arg_file_size_max, &st) <= 0) { | |
22be093f LP |
73 | close_nointr_nofail(fd); |
74 | fd = -1; | |
75 | } | |
76 | ||
189455ab LP |
77 | if (fread(&inode, sizeof(inode), 1, pack) != 1) { |
78 | log_error("Premature end of pack file."); | |
79 | r = -EIO; | |
80 | goto finish; | |
81 | } | |
82 | ||
83 | if (fd >= 0) { | |
84 | /* If the inode changed the file got deleted, so just | |
85 | * ignore this entry */ | |
86 | if (st.st_ino != (uint64_t) inode) { | |
87 | close_nointr_nofail(fd); | |
88 | fd = -1; | |
89 | } | |
90 | } | |
91 | ||
22be093f LP |
92 | for (;;) { |
93 | uint32_t b, c; | |
94 | ||
95 | if (fread(&b, sizeof(b), 1, pack) != 1 || | |
96 | fread(&c, sizeof(c), 1, pack) != 1) { | |
97 | log_error("Premature end of pack file."); | |
98 | r = -EIO; | |
99 | goto finish; | |
100 | } | |
101 | ||
102 | if (b == 0 && c == 0) | |
103 | break; | |
104 | ||
105 | if (c <= b) { | |
106 | log_error("Invalid pack file."); | |
107 | r = -EIO; | |
108 | goto finish; | |
109 | } | |
110 | ||
111 | log_debug("%s: page %u to %u", fn, b, c); | |
112 | ||
113 | any = true; | |
114 | ||
115 | if (fd >= 0) | |
37f85e66 | 116 | if (posix_fadvise(fd, b * page_size(), (c - b) * page_size(), POSIX_FADV_WILLNEED) < 0) { |
6e66797a | 117 | log_warning("posix_fadvise() failed: %m"); |
22be093f LP |
118 | goto finish; |
119 | } | |
120 | } | |
121 | ||
122 | if (!any && fd >= 0) { | |
123 | /* if no range is encoded in the pack file this is | |
124 | * intended to mean that the whole file shall be | |
125 | * read */ | |
126 | ||
6e66797a HH |
127 | if (posix_fadvise(fd, 0, st.st_size, POSIX_FADV_WILLNEED) < 0) { |
128 | log_warning("posix_fadvise() failed: %m"); | |
22be093f LP |
129 | goto finish; |
130 | } | |
131 | } | |
132 | ||
133 | finish: | |
134 | if (fd >= 0) | |
135 | close_nointr_nofail(fd); | |
136 | ||
137 | return r; | |
138 | } | |
139 | ||
140 | static int replay(const char *root) { | |
858209c5 | 141 | FILE *pack = NULL; |
22be093f LP |
142 | char line[LINE_MAX]; |
143 | int r = 0; | |
da19d5c1 LP |
144 | char *pack_fn = NULL; |
145 | int c; | |
902a339c | 146 | bool on_ssd, ready = false; |
22be093f | 147 | int prio; |
6624768c | 148 | int inotify_fd = -1; |
22be093f LP |
149 | |
150 | assert(root); | |
151 | ||
6de338a2 | 152 | block_bump_request_nr(root); |
75a010e0 | 153 | |
22be093f LP |
154 | if (asprintf(&pack_fn, "%s/.readahead", root) < 0) { |
155 | log_error("Out of memory"); | |
156 | r = -ENOMEM; | |
157 | goto finish; | |
158 | } | |
159 | ||
160 | if ((!(pack = fopen(pack_fn, "re")))) { | |
a78899f5 | 161 | if (errno == ENOENT) |
22be093f LP |
162 | log_debug("No pack file found."); |
163 | else { | |
164 | log_error("Failed to open pack file: %m"); | |
165 | r = -errno; | |
166 | } | |
167 | ||
168 | goto finish; | |
169 | } | |
170 | ||
bdb0e14d LP |
171 | posix_fadvise(fileno(pack), 0, 0, POSIX_FADV_WILLNEED); |
172 | ||
6624768c LP |
173 | if ((inotify_fd = open_inotify()) < 0) { |
174 | r = inotify_fd; | |
175 | goto finish; | |
176 | } | |
177 | ||
22be093f LP |
178 | if (!(fgets(line, sizeof(line), pack))) { |
179 | log_error("Premature end of pack file."); | |
180 | r = -EIO; | |
181 | goto finish; | |
182 | } | |
183 | ||
184 | char_array_0(line); | |
185 | ||
cae544bc | 186 | if (!streq(line, CANONICAL_HOST READAHEAD_PACK_FILE_VERSION)) { |
189455ab | 187 | log_debug("Pack file host or version type mismatch."); |
22be093f LP |
188 | goto finish; |
189 | } | |
190 | ||
191 | if ((c = getc(pack)) == EOF) { | |
192 | log_debug("Premature end of pack file."); | |
193 | r = -EIO; | |
194 | goto finish; | |
195 | } | |
196 | ||
197 | /* We do not retest SSD here, so that we can start replaying | |
198 | * before udev is up.*/ | |
199 | on_ssd = c == 'S'; | |
200 | log_debug("On SSD: %s", yes_no(on_ssd)); | |
201 | ||
202 | if (on_ssd) | |
203 | prio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0); | |
204 | else | |
05aa9edd LP |
205 | /* We are not using RT here, since we'd starve IO that |
206 | we didn't record (which is for example blkid, since | |
207 | its disk accesses go directly to the block device and | |
208 | are thus not visible in fallocate) to death. However, | |
209 | we do ask for an IO prio that is slightly higher than | |
210 | the default (which is BE. 4) */ | |
211 | prio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 2); | |
22be093f LP |
212 | |
213 | if (ioprio_set(IOPRIO_WHO_PROCESS, getpid(), prio) < 0) | |
214 | log_warning("Failed to set IDLE IO priority class: %m"); | |
215 | ||
902a339c | 216 | sd_notify(0, "STATUS=Replaying readahead data"); |
22be093f LP |
217 | |
218 | log_debug("Replaying..."); | |
219 | ||
2b583ce6 | 220 | if (access("/run/systemd/readahead/noreplay", F_OK) >= 0) { |
6624768c LP |
221 | log_debug("Got termination request"); |
222 | goto done; | |
223 | } | |
224 | ||
22be093f | 225 | while (!feof(pack) && !ferror(pack)) { |
6624768c | 226 | uint8_t inotify_buffer[sizeof(struct inotify_event) + FILENAME_MAX]; |
22be093f | 227 | int k; |
6624768c LP |
228 | ssize_t n; |
229 | ||
230 | if ((n = read(inotify_fd, &inotify_buffer, sizeof(inotify_buffer))) < 0) { | |
231 | if (errno != EINTR && errno != EAGAIN) { | |
232 | log_error("Failed to read inotify event: %m"); | |
233 | r = -errno; | |
234 | goto finish; | |
235 | } | |
236 | } else { | |
237 | struct inotify_event *e = (struct inotify_event*) inotify_buffer; | |
238 | ||
239 | while (n > 0) { | |
240 | size_t step; | |
241 | ||
242 | if ((e->mask & IN_CREATE) && streq(e->name, "noreplay")) { | |
243 | log_debug("Got termination request"); | |
244 | goto done; | |
245 | } | |
246 | ||
247 | step = sizeof(struct inotify_event) + e->len; | |
248 | assert(step <= (size_t) n); | |
249 | ||
250 | e = (struct inotify_event*) ((uint8_t*) e + step); | |
251 | n -= step; | |
252 | } | |
253 | } | |
22be093f LP |
254 | |
255 | if ((k = unpack_file(pack)) < 0) { | |
256 | r = k; | |
257 | goto finish; | |
258 | } | |
902a339c LP |
259 | |
260 | if (!ready) { | |
261 | /* We delay the ready notification until we | |
262 | * queued at least one read */ | |
263 | sd_notify(0, "READY=1"); | |
264 | ready = true; | |
265 | } | |
22be093f LP |
266 | } |
267 | ||
6624768c | 268 | done: |
902a339c LP |
269 | if (!ready) |
270 | sd_notify(0, "READY=1"); | |
271 | ||
22be093f LP |
272 | if (ferror(pack)) { |
273 | log_error("Failed to read pack file."); | |
274 | r = -EIO; | |
275 | goto finish; | |
276 | } | |
277 | ||
278 | log_debug("Done."); | |
279 | ||
280 | finish: | |
281 | if (pack) | |
282 | fclose(pack); | |
283 | ||
6624768c LP |
284 | if (inotify_fd >= 0) |
285 | close_nointr_nofail(inotify_fd); | |
286 | ||
22be093f LP |
287 | free(pack_fn); |
288 | ||
289 | return r; | |
290 | } | |
291 | ||
8260358d LP |
292 | |
293 | static int help(void) { | |
294 | ||
295 | printf("%s [OPTIONS...] [DIRECTORY]\n\n" | |
296 | "Replay collected read-ahead data on early boot.\n\n" | |
297 | " -h --help Show this help\n" | |
298 | " --max-file-size=BYTES Maximum size of files to read ahead\n", | |
299 | program_invocation_short_name); | |
300 | ||
301 | return 0; | |
302 | } | |
303 | ||
304 | static int parse_argv(int argc, char *argv[]) { | |
305 | ||
306 | enum { | |
307 | ARG_FILE_SIZE_MAX | |
308 | }; | |
309 | ||
310 | static const struct option options[] = { | |
311 | { "help", no_argument, NULL, 'h' }, | |
312 | { "file-size-max", required_argument, NULL, ARG_FILE_SIZE_MAX }, | |
313 | { NULL, 0, NULL, 0 } | |
314 | }; | |
315 | ||
316 | int c; | |
317 | ||
318 | assert(argc >= 0); | |
319 | assert(argv); | |
320 | ||
321 | while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0) { | |
322 | ||
323 | switch (c) { | |
324 | ||
325 | case 'h': | |
326 | help(); | |
327 | return 0; | |
328 | ||
329 | case ARG_FILE_SIZE_MAX: { | |
330 | unsigned long long ull; | |
331 | ||
332 | if (safe_atollu(optarg, &ull) < 0 || ull <= 0) { | |
333 | log_error("Failed to parse maximum file size %s.", optarg); | |
334 | return -EINVAL; | |
335 | } | |
336 | ||
337 | arg_file_size_max = (off_t) ull; | |
338 | break; | |
339 | } | |
340 | ||
341 | case '?': | |
342 | return -EINVAL; | |
343 | ||
344 | default: | |
345 | log_error("Unknown option code %c", c); | |
346 | return -EINVAL; | |
347 | } | |
348 | } | |
349 | ||
350 | if (optind != argc && | |
351 | optind != argc-1) { | |
352 | help(); | |
353 | return -EINVAL; | |
354 | } | |
355 | ||
356 | return 1; | |
357 | } | |
358 | ||
22be093f | 359 | int main(int argc, char*argv[]) { |
8260358d | 360 | int r; |
2b590e13 | 361 | const char *root; |
4030d7a9 | 362 | |
e905f48f | 363 | log_set_target(LOG_TARGET_SAFE); |
22be093f LP |
364 | log_parse_environment(); |
365 | log_open(); | |
366 | ||
4c12626c LP |
367 | umask(0022); |
368 | ||
3b2d5b02 LP |
369 | r = parse_argv(argc, argv); |
370 | if (r <= 0) | |
8260358d LP |
371 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; |
372 | ||
2b590e13 LP |
373 | root = optind < argc ? argv[optind] : "/"; |
374 | ||
41a598e2 LP |
375 | if (!enough_ram()) { |
376 | log_info("Disabling readahead replay due to low memory."); | |
377 | return 0; | |
378 | } | |
379 | ||
3b2d5b02 LP |
380 | shared = shared_get(); |
381 | if (!shared) | |
d9c7a87b LP |
382 | return 1; |
383 | ||
384 | shared->replay = getpid(); | |
385 | __sync_synchronize(); | |
386 | ||
2b590e13 | 387 | if (replay(root) < 0) |
22be093f LP |
388 | return 1; |
389 | ||
390 | return 0; | |
391 | } |