1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2010 Lennart Poettering
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.
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.
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/>.
25 #include <linux/limits.h>
30 #include <sys/select.h>
32 #include <sys/types.h>
36 #include <sys/inotify.h>
41 #include "sd-daemon.h"
43 #include "readahead-common.h"
45 static off_t arg_file_size_max = READAHEAD_FILE_SIZE_MAX;
47 static ReadaheadShared *shared = NULL;
49 static int unpack_file(FILE *pack) {
57 if (!fgets(fn, sizeof(fn), pack))
63 if ((fd = open(fn, O_RDONLY|O_CLOEXEC|O_NOATIME|O_NOCTTY|O_NOFOLLOW)) < 0)
64 log_warning("open(%s) failed: %m", fn);
65 else if (file_verify(fd, fn, arg_file_size_max, &st) <= 0) {
66 close_nointr_nofail(fd);
73 if (fread(&b, sizeof(b), 1, pack) != 1 ||
74 fread(&c, sizeof(c), 1, pack) != 1) {
75 log_error("Premature end of pack file.");
84 log_error("Invalid pack file.");
89 log_debug("%s: page %u to %u", fn, b, c);
94 if (posix_fadvise(fd, b * PAGE_SIZE, (c - b) * PAGE_SIZE, POSIX_FADV_WILLNEED) < 0) {
95 log_warning("posix_fadvise() failed: %m");
100 if (!any && fd >= 0) {
101 /* if no range is encoded in the pack file this is
102 * intended to mean that the whole file shall be
105 if (posix_fadvise(fd, 0, st.st_size, POSIX_FADV_WILLNEED) < 0) {
106 log_warning("posix_fadvise() failed: %m");
113 close_nointr_nofail(fd);
118 static int replay(const char *root) {
122 char *pack_fn = NULL, c;
123 bool on_ssd, ready = false;
129 write_one_line_file("/proc/self/oom_score_adj", "1000");
130 bump_request_nr(root);
132 if (asprintf(&pack_fn, "%s/.readahead", root) < 0) {
133 log_error("Out of memory");
138 if ((!(pack = fopen(pack_fn, "re")))) {
139 if (errno == -ENOENT)
140 log_debug("No pack file found.");
142 log_error("Failed to open pack file: %m");
149 posix_fadvise(fileno(pack), 0, 0, POSIX_FADV_WILLNEED);
151 if ((inotify_fd = open_inotify()) < 0) {
156 if (!(fgets(line, sizeof(line), pack))) {
157 log_error("Premature end of pack file.");
164 if (!streq(line, CANONICAL_HOST "\n")) {
165 log_debug("Pack file host type mismatch.");
169 if ((c = getc(pack)) == EOF) {
170 log_debug("Premature end of pack file.");
175 /* We do not retest SSD here, so that we can start replaying
176 * before udev is up.*/
178 log_debug("On SSD: %s", yes_no(on_ssd));
181 prio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0);
183 prio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_RT, 7);
185 if (ioprio_set(IOPRIO_WHO_PROCESS, getpid(), prio) < 0)
186 log_warning("Failed to set IDLE IO priority class: %m");
188 sd_notify(0, "STATUS=Replaying readahead data");
190 log_debug("Replaying...");
192 if (access("/dev/.systemd/readahead/noreplay", F_OK) >= 0) {
193 log_debug("Got termination request");
197 while (!feof(pack) && !ferror(pack)) {
198 uint8_t inotify_buffer[sizeof(struct inotify_event) + FILENAME_MAX];
202 if ((n = read(inotify_fd, &inotify_buffer, sizeof(inotify_buffer))) < 0) {
203 if (errno != EINTR && errno != EAGAIN) {
204 log_error("Failed to read inotify event: %m");
209 struct inotify_event *e = (struct inotify_event*) inotify_buffer;
214 if ((e->mask & IN_CREATE) && streq(e->name, "noreplay")) {
215 log_debug("Got termination request");
219 step = sizeof(struct inotify_event) + e->len;
220 assert(step <= (size_t) n);
222 e = (struct inotify_event*) ((uint8_t*) e + step);
227 if ((k = unpack_file(pack)) < 0) {
233 /* We delay the ready notification until we
234 * queued at least one read */
235 sd_notify(0, "READY=1");
242 sd_notify(0, "READY=1");
245 log_error("Failed to read pack file.");
257 close_nointr_nofail(inotify_fd);
265 static int help(void) {
267 printf("%s [OPTIONS...] [DIRECTORY]\n\n"
268 "Replay collected read-ahead data on early boot.\n\n"
269 " -h --help Show this help\n"
270 " --max-file-size=BYTES Maximum size of files to read ahead\n",
271 program_invocation_short_name);
276 static int parse_argv(int argc, char *argv[]) {
282 static const struct option options[] = {
283 { "help", no_argument, NULL, 'h' },
284 { "file-size-max", required_argument, NULL, ARG_FILE_SIZE_MAX },
293 while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0) {
301 case ARG_FILE_SIZE_MAX: {
302 unsigned long long ull;
304 if (safe_atollu(optarg, &ull) < 0 || ull <= 0) {
305 log_error("Failed to parse maximum file size %s.", optarg);
309 arg_file_size_max = (off_t) ull;
317 log_error("Unknown option code %c", c);
322 if (optind != argc &&
331 int main(int argc, char*argv[]) {
334 log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);
335 log_parse_environment();
338 if ((r = parse_argv(argc, argv)) <= 0)
339 return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
342 log_info("Disabling readahead replay due to low memory.");
346 if (!(shared = shared_get()))
349 shared->replay = getpid();
350 __sync_synchronize();
352 if (replay(optind < argc ? argv[optind] : "/") < 0)