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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> | |
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 | |
d9c7a87b LP |
47 | static ReadaheadShared *shared = NULL; |
48 | ||
22be093f LP |
49 | static int unpack_file(FILE *pack) { |
50 | char fn[PATH_MAX]; | |
51 | int r = 0, fd = -1; | |
52 | bool any = false; | |
53 | struct stat st; | |
189455ab | 54 | uint64_t inode; |
22be093f LP |
55 | |
56 | assert(pack); | |
57 | ||
58 | if (!fgets(fn, sizeof(fn), pack)) | |
59 | return 0; | |
60 | ||
61 | char_array_0(fn); | |
62 | truncate_nl(fn); | |
63 | ||
189455ab LP |
64 | fd = open(fn, O_RDONLY|O_CLOEXEC|O_NOATIME|O_NOCTTY|O_NOFOLLOW); |
65 | if (fd < 0) { | |
a78899f5 | 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 | ||
189455ab LP |
75 | if (fread(&inode, sizeof(inode), 1, pack) != 1) { |
76 | log_error("Premature end of pack file."); | |
77 | r = -EIO; | |
78 | goto finish; | |
79 | } | |
80 | ||
81 | if (fd >= 0) { | |
82 | /* If the inode changed the file got deleted, so just | |
83 | * ignore this entry */ | |
84 | if (st.st_ino != (uint64_t) inode) { | |
85 | close_nointr_nofail(fd); | |
86 | fd = -1; | |
87 | } | |
88 | } | |
89 | ||
22be093f LP |
90 | for (;;) { |
91 | uint32_t b, c; | |
92 | ||
93 | if (fread(&b, sizeof(b), 1, pack) != 1 || | |
94 | fread(&c, sizeof(c), 1, pack) != 1) { | |
95 | log_error("Premature end of pack file."); | |
96 | r = -EIO; | |
97 | goto finish; | |
98 | } | |
99 | ||
100 | if (b == 0 && c == 0) | |
101 | break; | |
102 | ||
103 | if (c <= b) { | |
104 | log_error("Invalid pack file."); | |
105 | r = -EIO; | |
106 | goto finish; | |
107 | } | |
108 | ||
109 | log_debug("%s: page %u to %u", fn, b, c); | |
110 | ||
111 | any = true; | |
112 | ||
113 | if (fd >= 0) | |
37f85e66 | 114 | if (posix_fadvise(fd, b * page_size(), (c - b) * page_size(), POSIX_FADV_WILLNEED) < 0) { |
6e66797a | 115 | log_warning("posix_fadvise() failed: %m"); |
22be093f LP |
116 | goto finish; |
117 | } | |
118 | } | |
119 | ||
120 | if (!any && fd >= 0) { | |
121 | /* if no range is encoded in the pack file this is | |
122 | * intended to mean that the whole file shall be | |
123 | * read */ | |
124 | ||
6e66797a HH |
125 | if (posix_fadvise(fd, 0, st.st_size, POSIX_FADV_WILLNEED) < 0) { |
126 | log_warning("posix_fadvise() failed: %m"); | |
22be093f LP |
127 | goto finish; |
128 | } | |
129 | } | |
130 | ||
131 | finish: | |
132 | if (fd >= 0) | |
133 | close_nointr_nofail(fd); | |
134 | ||
135 | return r; | |
136 | } | |
137 | ||
138 | static int replay(const char *root) { | |
858209c5 | 139 | FILE *pack = NULL; |
22be093f LP |
140 | char line[LINE_MAX]; |
141 | int r = 0; | |
da19d5c1 LP |
142 | char *pack_fn = NULL; |
143 | int c; | |
902a339c | 144 | bool on_ssd, ready = false; |
22be093f | 145 | int prio; |
6624768c | 146 | int inotify_fd = -1; |
22be093f LP |
147 | |
148 | assert(root); | |
149 | ||
6de338a2 | 150 | block_bump_request_nr(root); |
75a010e0 | 151 | |
22be093f | 152 | if (asprintf(&pack_fn, "%s/.readahead", root) < 0) { |
669241a0 | 153 | log_error("Out of memory."); |
22be093f LP |
154 | r = -ENOMEM; |
155 | goto finish; | |
156 | } | |
157 | ||
ebfb7506 LP |
158 | pack = fopen(pack_fn, "re"); |
159 | if (!pack) { | |
a78899f5 | 160 | if (errno == ENOENT) |
22be093f LP |
161 | log_debug("No pack file found."); |
162 | else { | |
163 | log_error("Failed to open pack file: %m"); | |
164 | r = -errno; | |
165 | } | |
166 | ||
167 | goto finish; | |
168 | } | |
169 | ||
bdb0e14d LP |
170 | posix_fadvise(fileno(pack), 0, 0, POSIX_FADV_WILLNEED); |
171 | ||
6624768c LP |
172 | if ((inotify_fd = open_inotify()) < 0) { |
173 | r = inotify_fd; | |
174 | goto finish; | |
175 | } | |
176 | ||
22be093f LP |
177 | if (!(fgets(line, sizeof(line), pack))) { |
178 | log_error("Premature end of pack file."); | |
179 | r = -EIO; | |
180 | goto finish; | |
181 | } | |
182 | ||
183 | char_array_0(line); | |
184 | ||
cae544bc | 185 | if (!streq(line, CANONICAL_HOST READAHEAD_PACK_FILE_VERSION)) { |
189455ab | 186 | log_debug("Pack file host or version type mismatch."); |
22be093f LP |
187 | goto finish; |
188 | } | |
189 | ||
190 | if ((c = getc(pack)) == EOF) { | |
191 | log_debug("Premature end of pack file."); | |
192 | r = -EIO; | |
193 | goto finish; | |
194 | } | |
195 | ||
196 | /* We do not retest SSD here, so that we can start replaying | |
197 | * before udev is up.*/ | |
198 | on_ssd = c == 'S'; | |
199 | log_debug("On SSD: %s", yes_no(on_ssd)); | |
200 | ||
201 | if (on_ssd) | |
202 | prio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0); | |
203 | else | |
05aa9edd LP |
204 | /* We are not using RT here, since we'd starve IO that |
205 | we didn't record (which is for example blkid, since | |
206 | its disk accesses go directly to the block device and | |
207 | are thus not visible in fallocate) to death. However, | |
208 | we do ask for an IO prio that is slightly higher than | |
209 | the default (which is BE. 4) */ | |
210 | prio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 2); | |
22be093f LP |
211 | |
212 | if (ioprio_set(IOPRIO_WHO_PROCESS, getpid(), prio) < 0) | |
213 | log_warning("Failed to set IDLE IO priority class: %m"); | |
214 | ||
902a339c | 215 | sd_notify(0, "STATUS=Replaying readahead data"); |
22be093f LP |
216 | |
217 | log_debug("Replaying..."); | |
218 | ||
2b583ce6 | 219 | if (access("/run/systemd/readahead/noreplay", F_OK) >= 0) { |
6624768c LP |
220 | log_debug("Got termination request"); |
221 | goto done; | |
222 | } | |
223 | ||
22be093f | 224 | while (!feof(pack) && !ferror(pack)) { |
6624768c | 225 | uint8_t inotify_buffer[sizeof(struct inotify_event) + FILENAME_MAX]; |
22be093f | 226 | int k; |
6624768c LP |
227 | ssize_t n; |
228 | ||
229 | if ((n = read(inotify_fd, &inotify_buffer, sizeof(inotify_buffer))) < 0) { | |
230 | if (errno != EINTR && errno != EAGAIN) { | |
231 | log_error("Failed to read inotify event: %m"); | |
232 | r = -errno; | |
233 | goto finish; | |
234 | } | |
235 | } else { | |
236 | struct inotify_event *e = (struct inotify_event*) inotify_buffer; | |
237 | ||
238 | while (n > 0) { | |
239 | size_t step; | |
240 | ||
241 | if ((e->mask & IN_CREATE) && streq(e->name, "noreplay")) { | |
242 | log_debug("Got termination request"); | |
243 | goto done; | |
244 | } | |
245 | ||
246 | step = sizeof(struct inotify_event) + e->len; | |
247 | assert(step <= (size_t) n); | |
248 | ||
249 | e = (struct inotify_event*) ((uint8_t*) e + step); | |
250 | n -= step; | |
251 | } | |
252 | } | |
22be093f LP |
253 | |
254 | if ((k = unpack_file(pack)) < 0) { | |
255 | r = k; | |
256 | goto finish; | |
257 | } | |
902a339c LP |
258 | |
259 | if (!ready) { | |
260 | /* We delay the ready notification until we | |
261 | * queued at least one read */ | |
262 | sd_notify(0, "READY=1"); | |
263 | ready = true; | |
264 | } | |
22be093f LP |
265 | } |
266 | ||
6624768c | 267 | done: |
902a339c LP |
268 | if (!ready) |
269 | sd_notify(0, "READY=1"); | |
270 | ||
22be093f LP |
271 | if (ferror(pack)) { |
272 | log_error("Failed to read pack file."); | |
273 | r = -EIO; | |
274 | goto finish; | |
275 | } | |
276 | ||
277 | log_debug("Done."); | |
278 | ||
279 | finish: | |
280 | if (pack) | |
281 | fclose(pack); | |
282 | ||
6624768c LP |
283 | if (inotify_fd >= 0) |
284 | close_nointr_nofail(inotify_fd); | |
285 | ||
22be093f LP |
286 | free(pack_fn); |
287 | ||
288 | return r; | |
289 | } | |
290 | ||
87ce22cc | 291 | int main_replay(const char *root) { |
8260358d | 292 | |
87ce22cc LP |
293 | if (!root) |
294 | root = "/"; | |
2b590e13 | 295 | |
41a598e2 LP |
296 | if (!enough_ram()) { |
297 | log_info("Disabling readahead replay due to low memory."); | |
87ce22cc | 298 | return EXIT_SUCCESS; |
41a598e2 LP |
299 | } |
300 | ||
3b2d5b02 LP |
301 | shared = shared_get(); |
302 | if (!shared) | |
87ce22cc | 303 | return EXIT_FAILURE; |
d9c7a87b LP |
304 | |
305 | shared->replay = getpid(); | |
306 | __sync_synchronize(); | |
307 | ||
2b590e13 | 308 | if (replay(root) < 0) |
87ce22cc | 309 | return EXIT_FAILURE; |
22be093f | 310 | |
87ce22cc | 311 | return EXIT_SUCCESS; |
22be093f | 312 | } |