376 lines
11 KiB
C
376 lines
11 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <errno.h>
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#include <inttypes.h>
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#include <fcntl.h>
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#include <linux/limits.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/select.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <getopt.h>
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#include <sys/inotify.h>
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#include <systemd/sd-daemon.h>
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#include "missing.h"
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#include "util.h"
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#include "set.h"
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#include "ioprio.h"
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#include "readahead-common.h"
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#include "virt.h"
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static off_t arg_file_size_max = READAHEAD_FILE_SIZE_MAX;
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static ReadaheadShared *shared = NULL;
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static int unpack_file(FILE *pack) {
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char fn[PATH_MAX];
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int r = 0, fd = -1;
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bool any = false;
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struct stat st;
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assert(pack);
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if (!fgets(fn, sizeof(fn), pack))
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return 0;
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char_array_0(fn);
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truncate_nl(fn);
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if ((fd = open(fn, O_RDONLY|O_CLOEXEC|O_NOATIME|O_NOCTTY|O_NOFOLLOW)) < 0) {
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if (errno != ENOENT && errno != EPERM && errno != EACCES)
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log_warning("open(%s) failed: %m", fn);
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} else if (file_verify(fd, fn, arg_file_size_max, &st) <= 0) {
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close_nointr_nofail(fd);
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fd = -1;
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}
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for (;;) {
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uint32_t b, c;
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if (fread(&b, sizeof(b), 1, pack) != 1 ||
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fread(&c, sizeof(c), 1, pack) != 1) {
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log_error("Premature end of pack file.");
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r = -EIO;
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goto finish;
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}
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if (b == 0 && c == 0)
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break;
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if (c <= b) {
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log_error("Invalid pack file.");
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r = -EIO;
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goto finish;
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}
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log_debug("%s: page %u to %u", fn, b, c);
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any = true;
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if (fd >= 0)
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if (posix_fadvise(fd, b * page_size(), (c - b) * page_size(), POSIX_FADV_WILLNEED) < 0) {
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log_warning("posix_fadvise() failed: %m");
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goto finish;
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}
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}
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if (!any && fd >= 0) {
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/* if no range is encoded in the pack file this is
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* intended to mean that the whole file shall be
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* read */
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if (posix_fadvise(fd, 0, st.st_size, POSIX_FADV_WILLNEED) < 0) {
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log_warning("posix_fadvise() failed: %m");
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goto finish;
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}
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}
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finish:
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if (fd >= 0)
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close_nointr_nofail(fd);
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return r;
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}
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static int replay(const char *root) {
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FILE *pack = NULL;
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char line[LINE_MAX];
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int r = 0;
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char *pack_fn = NULL;
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int c;
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bool on_ssd, ready = false;
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int prio;
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int inotify_fd = -1;
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assert(root);
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write_one_line_file("/proc/self/oom_score_adj", "1000");
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bump_request_nr(root);
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if (asprintf(&pack_fn, "%s/.readahead", root) < 0) {
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log_error("Out of memory");
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r = -ENOMEM;
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goto finish;
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}
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if ((!(pack = fopen(pack_fn, "re")))) {
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if (errno == ENOENT)
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log_debug("No pack file found.");
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else {
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log_error("Failed to open pack file: %m");
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r = -errno;
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}
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goto finish;
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}
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posix_fadvise(fileno(pack), 0, 0, POSIX_FADV_WILLNEED);
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if ((inotify_fd = open_inotify()) < 0) {
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r = inotify_fd;
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goto finish;
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}
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if (!(fgets(line, sizeof(line), pack))) {
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log_error("Premature end of pack file.");
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r = -EIO;
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goto finish;
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}
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char_array_0(line);
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if (!streq(line, CANONICAL_HOST "\n")) {
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log_debug("Pack file host type mismatch.");
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goto finish;
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}
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if ((c = getc(pack)) == EOF) {
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log_debug("Premature end of pack file.");
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r = -EIO;
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goto finish;
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}
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/* We do not retest SSD here, so that we can start replaying
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* before udev is up.*/
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on_ssd = c == 'S';
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log_debug("On SSD: %s", yes_no(on_ssd));
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if (on_ssd)
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prio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0);
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else
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/* We are not using RT here, since we'd starve IO that
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we didn't record (which is for example blkid, since
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its disk accesses go directly to the block device and
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are thus not visible in fallocate) to death. However,
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we do ask for an IO prio that is slightly higher than
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the default (which is BE. 4) */
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prio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 2);
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if (ioprio_set(IOPRIO_WHO_PROCESS, getpid(), prio) < 0)
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log_warning("Failed to set IDLE IO priority class: %m");
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sd_notify(0, "STATUS=Replaying readahead data");
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log_debug("Replaying...");
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if (access("/run/systemd/readahead/noreplay", F_OK) >= 0) {
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log_debug("Got termination request");
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goto done;
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}
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while (!feof(pack) && !ferror(pack)) {
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uint8_t inotify_buffer[sizeof(struct inotify_event) + FILENAME_MAX];
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int k;
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ssize_t n;
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if ((n = read(inotify_fd, &inotify_buffer, sizeof(inotify_buffer))) < 0) {
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if (errno != EINTR && errno != EAGAIN) {
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log_error("Failed to read inotify event: %m");
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r = -errno;
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goto finish;
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}
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} else {
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struct inotify_event *e = (struct inotify_event*) inotify_buffer;
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while (n > 0) {
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size_t step;
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if ((e->mask & IN_CREATE) && streq(e->name, "noreplay")) {
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log_debug("Got termination request");
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goto done;
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}
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step = sizeof(struct inotify_event) + e->len;
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assert(step <= (size_t) n);
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e = (struct inotify_event*) ((uint8_t*) e + step);
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n -= step;
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}
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}
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if ((k = unpack_file(pack)) < 0) {
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r = k;
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goto finish;
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}
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if (!ready) {
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/* We delay the ready notification until we
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* queued at least one read */
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sd_notify(0, "READY=1");
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ready = true;
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}
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}
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done:
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if (!ready)
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sd_notify(0, "READY=1");
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if (ferror(pack)) {
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log_error("Failed to read pack file.");
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r = -EIO;
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goto finish;
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}
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log_debug("Done.");
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finish:
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if (pack)
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fclose(pack);
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if (inotify_fd >= 0)
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close_nointr_nofail(inotify_fd);
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free(pack_fn);
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return r;
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}
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static int help(void) {
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printf("%s [OPTIONS...] [DIRECTORY]\n\n"
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"Replay collected read-ahead data on early boot.\n\n"
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" -h --help Show this help\n"
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" --max-file-size=BYTES Maximum size of files to read ahead\n",
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program_invocation_short_name);
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return 0;
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}
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static int parse_argv(int argc, char *argv[]) {
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enum {
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ARG_FILE_SIZE_MAX
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};
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static const struct option options[] = {
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{ "help", no_argument, NULL, 'h' },
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{ "file-size-max", required_argument, NULL, ARG_FILE_SIZE_MAX },
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{ NULL, 0, NULL, 0 }
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};
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int c;
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assert(argc >= 0);
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assert(argv);
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while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0) {
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switch (c) {
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case 'h':
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help();
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return 0;
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case ARG_FILE_SIZE_MAX: {
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unsigned long long ull;
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if (safe_atollu(optarg, &ull) < 0 || ull <= 0) {
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log_error("Failed to parse maximum file size %s.", optarg);
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return -EINVAL;
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}
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arg_file_size_max = (off_t) ull;
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break;
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}
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case '?':
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return -EINVAL;
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default:
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log_error("Unknown option code %c", c);
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return -EINVAL;
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}
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}
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if (optind != argc &&
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optind != argc-1) {
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help();
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return -EINVAL;
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}
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return 1;
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}
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int main(int argc, char*argv[]) {
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int r;
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const char *root;
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log_set_target(LOG_TARGET_AUTO);
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log_parse_environment();
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log_open();
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umask(0022);
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r = parse_argv(argc, argv);
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if (r <= 0)
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return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
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root = optind < argc ? argv[optind] : "/";
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if (!enough_ram()) {
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log_info("Disabling readahead replay due to low memory.");
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return 0;
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}
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shared = shared_get();
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if (!shared)
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return 1;
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shared->replay = getpid();
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__sync_synchronize();
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if (replay(root) < 0)
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return 1;
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return 0;
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}
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