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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2010 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <errno.h>
#include <inttypes.h>
#include <fcntl.h>
#include <linux/limits.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/select.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include "missing.h"
#include "util.h"
#include "set.h"
#include "sd-daemon.h"
#include "ioprio.h"
#include "readahead-common.h"
static int unpack_file(FILE *pack) {
char fn[PATH_MAX];
int r = 0, fd = -1;
bool any = false;
struct stat st;
assert(pack);
if (!fgets(fn, sizeof(fn), pack))
return 0;
char_array_0(fn);
truncate_nl(fn);
if ((fd = open(fn, O_RDONLY|O_CLOEXEC|O_NOATIME|O_NOCTTY|O_NOFOLLOW)) < 0)
log_warning("open(%s) failed: %m", fn);
else if (file_verify(fd, fn, &st) <= 0) {
close_nointr_nofail(fd);
fd = -1;
}
for (;;) {
uint32_t b, c;
if (fread(&b, sizeof(b), 1, pack) != 1 ||
fread(&c, sizeof(c), 1, pack) != 1) {
log_error("Premature end of pack file.");
r = -EIO;
goto finish;
}
if (b == 0 && c == 0)
break;
if (c <= b) {
log_error("Invalid pack file.");
r = -EIO;
goto finish;
}
log_debug("%s: page %u to %u", fn, b, c);
any = true;
if (fd >= 0)
if (readahead(fd, b * PAGE_SIZE, (c - b) * PAGE_SIZE) < 0) {
log_warning("readahead() failed: %m");
goto finish;
}
}
if (!any && fd >= 0) {
/* if no range is encoded in the pack file this is
* intended to mean that the whole file shall be
* read */
if (readahead(fd, 0, st.st_size) < 0) {
log_warning("readahead() failed: %m");
goto finish;
}
}
finish:
if (fd >= 0)
close_nointr_nofail(fd);
return r;
}
static int replay(const char *root) {
FILE *pack;
char line[LINE_MAX];
int r = 0;
char *pack_fn = NULL, c;
bool on_ssd;
int prio;
assert(root);
if (asprintf(&pack_fn, "%s/.readahead", root) < 0) {
log_error("Out of memory");
r = -ENOMEM;
goto finish;
}
if ((!(pack = fopen(pack_fn, "re")))) {
if (errno == -ENOENT)
log_debug("No pack file found.");
else {
log_error("Failed to open pack file: %m");
r = -errno;
}
goto finish;
}
if (!(fgets(line, sizeof(line), pack))) {
log_error("Premature end of pack file.");
r = -EIO;
goto finish;
}
char_array_0(line);
if (!streq(line, CANONICAL_HOST "\n")) {
log_debug("Pack file host type mismatch.");
goto finish;
}
if ((c = getc(pack)) == EOF) {
log_debug("Premature end of pack file.");
r = -EIO;
goto finish;
}
/* We do not retest SSD here, so that we can start replaying
* before udev is up.*/
on_ssd = c == 'S';
log_debug("On SSD: %s", yes_no(on_ssd));
if (on_ssd)
prio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0);
else
prio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_RT, 7);
if (ioprio_set(IOPRIO_WHO_PROCESS, getpid(), prio) < 0)
log_warning("Failed to set IDLE IO priority class: %m");
sd_notify(0,
"READY=1\n"
"STATUS=Replaying readahead data");
log_debug("Replaying...");
while (!feof(pack) && !ferror(pack)) {
int k;
if ((k = unpack_file(pack)) < 0) {
r = k;
goto finish;
}
}
if (ferror(pack)) {
log_error("Failed to read pack file.");
r = -EIO;
goto finish;
}
log_debug("Done.");
finish:
if (pack)
fclose(pack);
free(pack_fn);
return r;
}
int main(int argc, char*argv[]) {
log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);
log_parse_environment();
log_open();
if (replay("/") < 0)
return 1;
return 0;
}
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