diff options
Diffstat (limited to 'src/readahead/readahead-replay.c')
| -rw-r--r-- | src/readahead/readahead-replay.c | 281 |
1 files changed, 0 insertions, 281 deletions
diff --git a/src/readahead/readahead-replay.c b/src/readahead/readahead-replay.c deleted file mode 100644 index f81e0fe55d..0000000000 --- a/src/readahead/readahead-replay.c +++ /dev/null @@ -1,281 +0,0 @@ -/*-*- 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; -} |