+++ /dev/null
-/*-*- 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 Lesser General Public License as published by
- the Free Software Foundation; either version 2.1 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
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser 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 <getopt.h>
-#include <sys/inotify.h>
-
-#include "systemd/sd-daemon.h"
-
-#include "missing.h"
-#include "util.h"
-#include "set.h"
-#include "ioprio.h"
-#include "readahead-common.h"
-#include "virt.h"
-
-static ReadaheadShared *shared = NULL;
-
-static int unpack_file(FILE *pack) {
- _cleanup_close_ int fd = -1;
- char fn[PATH_MAX];
- bool any = false;
- struct stat st;
- uint64_t inode;
-
- assert(pack);
-
- if (!fgets(fn, sizeof(fn), pack))
- return 0;
-
- char_array_0(fn);
- truncate_nl(fn);
-
- fd = open(fn, O_RDONLY|O_CLOEXEC|O_NOATIME|O_NOCTTY|O_NOFOLLOW);
- if (fd < 0) {
- if (errno != ENOENT && errno != EPERM && errno != EACCES && errno != ELOOP)
- log_warning("open(%s) failed: %m", fn);
-
- } else if (file_verify(fd, fn, arg_file_size_max, &st) <= 0)
- fd = safe_close(fd);
-
- if (fread(&inode, sizeof(inode), 1, pack) != 1) {
- log_error("Premature end of pack file.");
- return -EIO;
- }
-
- if (fd >= 0) {
- /* If the inode changed the file got deleted, so just
- * ignore this entry */
- if (st.st_ino != (uint64_t) inode)
- fd = safe_close(fd);
- }
-
- 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.");
- return -EIO;
- }
-
- if (b == 0 && c == 0)
- break;
-
- if (c <= b) {
- log_error("Invalid pack file.");
- return -EIO;
- }
-
- log_debug("%s: page %u to %u", fn, b, c);
-
- any = true;
-
- if (fd >= 0) {
- if (posix_fadvise(fd, b * page_size(), (c - b) * page_size(), POSIX_FADV_WILLNEED) < 0) {
- log_warning("posix_fadvise() failed: %m");
- return -errno;
- }
- }
- }
-
- 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 (posix_fadvise(fd, 0, st.st_size, POSIX_FADV_WILLNEED) < 0) {
- log_warning("posix_fadvise() failed: %m");
- return -errno;
- }
- }
-
- return 0;
-}
-
-static int replay(const char *root) {
- _cleanup_close_ int inotify_fd = -1;
- _cleanup_free_ char *pack_fn = NULL;
- _cleanup_fclose_ FILE *pack = NULL;
- bool on_ssd, ready = false;
- char line[LINE_MAX];
- int prio, c;
-
- assert(root);
-
- block_bump_request_nr(root);
-
- if (asprintf(&pack_fn, "%s/.readahead", root) < 0)
- return log_oom();
-
- pack = fopen(pack_fn, "re");
- if (!pack) {
- if (errno == ENOENT) {
- log_debug("No pack file found.");
- return 0;
- }
-
- log_error("Failed to open pack file: %m");
- return -errno;
- }
-
- posix_fadvise(fileno(pack), 0, 0, POSIX_FADV_WILLNEED);
-
- inotify_fd = open_inotify();
- if (inotify_fd < 0)
- return inotify_fd;
-
- if (!fgets(line, sizeof(line), pack)) {
- log_error("Premature end of pack file.");
- return -EIO;
- }
-
- char_array_0(line);
-
- if (!streq(line, CANONICAL_HOST READAHEAD_PACK_FILE_VERSION)) {
- log_debug("Pack file host or version type mismatch.");
- goto done;
- }
-
- c = getc(pack);
- if (c == EOF) {
- log_debug("Premature end of pack file.");
- return -EIO;
- }
-
- /* 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
- /* We are not using RT here, since we'd starve IO that
- we didn't record (which is for example blkid, since
- its disk accesses go directly to the block device and
- are thus not visible in fallocate) to death. However,
- we do ask for an IO prio that is slightly higher than
- the default (which is BE. 4) */
- prio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 2);
-
- if (ioprio_set(IOPRIO_WHO_PROCESS, getpid(), prio) < 0)
- log_warning("Failed to set IDLE IO priority class: %m");
-
- sd_notify(0, "STATUS=Replaying readahead data");
-
- log_debug("Replaying...");
-
- if (access("/run/systemd/readahead/noreplay", F_OK) >= 0) {
- log_debug("Got termination request");
- goto done;
- }
-
- while (!feof(pack) && !ferror(pack)) {
- uint8_t inotify_buffer[sizeof(struct inotify_event) + FILENAME_MAX];
- int k;
- ssize_t n;
-
- n = read(inotify_fd, &inotify_buffer, sizeof(inotify_buffer));
- if (n < 0) {
- if (errno != EINTR && errno != EAGAIN) {
- log_error("Failed to read inotify event: %m");
- return -errno;
- }
- } else {
- struct inotify_event *e = (struct inotify_event*) inotify_buffer;
-
- while (n > 0) {
- size_t step;
-
- if ((e->mask & IN_CREATE) && streq(e->name, "noreplay")) {
- log_debug("Got termination request");
- goto done;
- }
-
- step = sizeof(struct inotify_event) + e->len;
- assert(step <= (size_t) n);
-
- e = (struct inotify_event*) ((uint8_t*) e + step);
- n -= step;
- }
- }
-
- k = unpack_file(pack);
- if (k < 0)
- return k;
-
- if (!ready) {
- /* We delay the ready notification until we
- * queued at least one read */
- sd_notify(0, "READY=1");
- ready = true;
- }
- }
-
-done:
- if (ferror(pack)) {
- log_error("Failed to read pack file.");
- return -EIO;
- }
-
- if (!ready)
- sd_notify(0, "READY=1");
-
- log_debug("Done.");
- return 0;
-}
-
-int main_replay(const char *root) {
-
- if (!root)
- root = "/";
-
- if (!enough_ram()) {
- log_info("Disabling readahead replay due to low memory.");
- return EXIT_SUCCESS;
- }
-
- shared = shared_get();
- if (!shared)
- return EXIT_FAILURE;
-
- shared->replay = getpid();
- __sync_synchronize();
-
- if (replay(root) < 0)
- return EXIT_FAILURE;
-
- return EXIT_SUCCESS;
-}
~ianmdlvl / elogind.git / blobdiff