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"
46 static off_t arg_file_size_max = READAHEAD_FILE_SIZE_MAX;
48 static ReadaheadShared *shared = NULL;
50 static int unpack_file(FILE *pack) {
58 if (!fgets(fn, sizeof(fn), pack))
64 if ((fd = open(fn, O_RDONLY|O_CLOEXEC|O_NOATIME|O_NOCTTY|O_NOFOLLOW)) < 0) {
66 if (errno != ENOENT && errno != EPERM && errno != EACCES)
67 log_warning("open(%s) failed: %m", fn);
69 } else if (file_verify(fd, fn, arg_file_size_max, &st) <= 0) {
70 close_nointr_nofail(fd);
77 if (fread(&b, sizeof(b), 1, pack) != 1 ||
78 fread(&c, sizeof(c), 1, pack) != 1) {
79 log_error("Premature end of pack file.");
88 log_error("Invalid pack file.");
93 log_debug("%s: page %u to %u", fn, b, c);
98 if (posix_fadvise(fd, b * page_size(), (c - b) * page_size(), POSIX_FADV_WILLNEED) < 0) {
99 log_warning("posix_fadvise() failed: %m");
104 if (!any && fd >= 0) {
105 /* if no range is encoded in the pack file this is
106 * intended to mean that the whole file shall be
109 if (posix_fadvise(fd, 0, st.st_size, POSIX_FADV_WILLNEED) < 0) {
110 log_warning("posix_fadvise() failed: %m");
117 close_nointr_nofail(fd);
122 static int replay(const char *root) {
126 char *pack_fn = NULL;
128 bool on_ssd, ready = false;
134 write_one_line_file("/proc/self/oom_score_adj", "1000");
135 bump_request_nr(root);
137 if (asprintf(&pack_fn, "%s/.readahead", root) < 0) {
138 log_error("Out of memory");
143 if ((!(pack = fopen(pack_fn, "re")))) {
145 log_debug("No pack file found.");
147 log_error("Failed to open pack file: %m");
154 posix_fadvise(fileno(pack), 0, 0, POSIX_FADV_WILLNEED);
156 if ((inotify_fd = open_inotify()) < 0) {
161 if (!(fgets(line, sizeof(line), pack))) {
162 log_error("Premature end of pack file.");
169 if (!streq(line, CANONICAL_HOST "\n")) {
170 log_debug("Pack file host type mismatch.");
174 if ((c = getc(pack)) == EOF) {
175 log_debug("Premature end of pack file.");
180 /* We do not retest SSD here, so that we can start replaying
181 * before udev is up.*/
183 log_debug("On SSD: %s", yes_no(on_ssd));
186 prio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0);
188 prio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_RT, 7);
190 if (ioprio_set(IOPRIO_WHO_PROCESS, getpid(), prio) < 0)
191 log_warning("Failed to set IDLE IO priority class: %m");
193 sd_notify(0, "STATUS=Replaying readahead data");
195 log_debug("Replaying...");
197 if (access("/run/systemd/readahead/noreplay", F_OK) >= 0) {
198 log_debug("Got termination request");
202 while (!feof(pack) && !ferror(pack)) {
203 uint8_t inotify_buffer[sizeof(struct inotify_event) + FILENAME_MAX];
207 if ((n = read(inotify_fd, &inotify_buffer, sizeof(inotify_buffer))) < 0) {
208 if (errno != EINTR && errno != EAGAIN) {
209 log_error("Failed to read inotify event: %m");
214 struct inotify_event *e = (struct inotify_event*) inotify_buffer;
219 if ((e->mask & IN_CREATE) && streq(e->name, "noreplay")) {
220 log_debug("Got termination request");
224 step = sizeof(struct inotify_event) + e->len;
225 assert(step <= (size_t) n);
227 e = (struct inotify_event*) ((uint8_t*) e + step);
232 if ((k = unpack_file(pack)) < 0) {
238 /* We delay the ready notification until we
239 * queued at least one read */
240 sd_notify(0, "READY=1");
247 sd_notify(0, "READY=1");
250 log_error("Failed to read pack file.");
262 close_nointr_nofail(inotify_fd);
270 static int help(void) {
272 printf("%s [OPTIONS...] [DIRECTORY]\n\n"
273 "Replay collected read-ahead data on early boot.\n\n"
274 " -h --help Show this help\n"
275 " --max-file-size=BYTES Maximum size of files to read ahead\n",
276 program_invocation_short_name);
281 static int parse_argv(int argc, char *argv[]) {
287 static const struct option options[] = {
288 { "help", no_argument, NULL, 'h' },
289 { "file-size-max", required_argument, NULL, ARG_FILE_SIZE_MAX },
298 while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0) {
306 case ARG_FILE_SIZE_MAX: {
307 unsigned long long ull;
309 if (safe_atollu(optarg, &ull) < 0 || ull <= 0) {
310 log_error("Failed to parse maximum file size %s.", optarg);
314 arg_file_size_max = (off_t) ull;
322 log_error("Unknown option code %c", c);
327 if (optind != argc &&
336 int main(int argc, char*argv[]) {
340 log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);
341 log_parse_environment();
346 if ((r = parse_argv(argc, argv)) <= 0)
347 return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
349 root = optind < argc ? argv[optind] : "/";
352 log_info("Disabling readahead replay due to low memory.");
356 if (detect_virtualization(NULL) > 0) {
357 log_info("Disabling readahead replay due to execution in virtualized environment.");
361 if (!(shared = shared_get()))
364 shared->replay = getpid();
365 __sync_synchronize();
367 if (replay(root) < 0)