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>
38 #include <systemd/sd-daemon.h>
44 #include "readahead-common.h"
47 static off_t arg_file_size_max = READAHEAD_FILE_SIZE_MAX;
49 static ReadaheadShared *shared = NULL;
51 static int unpack_file(FILE *pack) {
59 if (!fgets(fn, sizeof(fn), pack))
65 if ((fd = open(fn, O_RDONLY|O_CLOEXEC|O_NOATIME|O_NOCTTY|O_NOFOLLOW)) < 0) {
67 if (errno != ENOENT && errno != EPERM && errno != EACCES)
68 log_warning("open(%s) failed: %m", fn);
70 } else if (file_verify(fd, fn, arg_file_size_max, &st) <= 0) {
71 close_nointr_nofail(fd);
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.");
89 log_error("Invalid pack file.");
94 log_debug("%s: page %u to %u", fn, b, c);
99 if (posix_fadvise(fd, b * page_size(), (c - b) * page_size(), POSIX_FADV_WILLNEED) < 0) {
100 log_warning("posix_fadvise() failed: %m");
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
110 if (posix_fadvise(fd, 0, st.st_size, POSIX_FADV_WILLNEED) < 0) {
111 log_warning("posix_fadvise() failed: %m");
118 close_nointr_nofail(fd);
123 static int replay(const char *root) {
127 char *pack_fn = NULL;
129 bool on_ssd, ready = false;
135 write_one_line_file("/proc/self/oom_score_adj", "1000");
136 bump_request_nr(root);
138 if (asprintf(&pack_fn, "%s/.readahead", root) < 0) {
139 log_error("Out of memory");
144 if ((!(pack = fopen(pack_fn, "re")))) {
146 log_debug("No pack file found.");
148 log_error("Failed to open pack file: %m");
155 posix_fadvise(fileno(pack), 0, 0, POSIX_FADV_WILLNEED);
157 if ((inotify_fd = open_inotify()) < 0) {
162 if (!(fgets(line, sizeof(line), pack))) {
163 log_error("Premature end of pack file.");
170 if (!streq(line, CANONICAL_HOST "\n")) {
171 log_debug("Pack file host type mismatch.");
175 if ((c = getc(pack)) == EOF) {
176 log_debug("Premature end of pack file.");
181 /* We do not retest SSD here, so that we can start replaying
182 * before udev is up.*/
184 log_debug("On SSD: %s", yes_no(on_ssd));
187 prio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0);
189 prio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_RT, 7);
191 if (ioprio_set(IOPRIO_WHO_PROCESS, getpid(), prio) < 0)
192 log_warning("Failed to set IDLE IO priority class: %m");
194 sd_notify(0, "STATUS=Replaying readahead data");
196 log_debug("Replaying...");
198 if (access("/run/systemd/readahead/noreplay", F_OK) >= 0) {
199 log_debug("Got termination request");
203 while (!feof(pack) && !ferror(pack)) {
204 uint8_t inotify_buffer[sizeof(struct inotify_event) + FILENAME_MAX];
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");
215 struct inotify_event *e = (struct inotify_event*) inotify_buffer;
220 if ((e->mask & IN_CREATE) && streq(e->name, "noreplay")) {
221 log_debug("Got termination request");
225 step = sizeof(struct inotify_event) + e->len;
226 assert(step <= (size_t) n);
228 e = (struct inotify_event*) ((uint8_t*) e + step);
233 if ((k = unpack_file(pack)) < 0) {
239 /* We delay the ready notification until we
240 * queued at least one read */
241 sd_notify(0, "READY=1");
248 sd_notify(0, "READY=1");
251 log_error("Failed to read pack file.");
263 close_nointr_nofail(inotify_fd);
271 static int help(void) {
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);
282 static int parse_argv(int argc, char *argv[]) {
288 static const struct option options[] = {
289 { "help", no_argument, NULL, 'h' },
290 { "file-size-max", required_argument, NULL, ARG_FILE_SIZE_MAX },
299 while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0) {
307 case ARG_FILE_SIZE_MAX: {
308 unsigned long long ull;
310 if (safe_atollu(optarg, &ull) < 0 || ull <= 0) {
311 log_error("Failed to parse maximum file size %s.", optarg);
315 arg_file_size_max = (off_t) ull;
323 log_error("Unknown option code %c", c);
328 if (optind != argc &&
337 int main(int argc, char*argv[]) {
341 log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);
342 log_parse_environment();
347 if ((r = parse_argv(argc, argv)) <= 0)
348 return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
350 root = optind < argc ? argv[optind] : "/";
353 log_info("Disabling readahead replay due to low memory.");
357 if (detect_virtualization(NULL) > 0) {
358 log_info("Disabling readahead replay due to execution in virtualized environment.");
362 if (!(shared = shared_get()))
365 shared->replay = getpid();
366 __sync_synchronize();
368 if (replay(root) < 0)