Isolation of udev code from remaining systemd

This commit is a first attempt to isolate the udev code from the
remaining code base.  It intentionally does not modify any files
but purely delete files which, on a first examination, appear to
not be needed.  This is a sweeping commit which may easily have
missed needed code.  Files can be retrieved by doing a checkout
from the previous commit:

 git checkout 2944f347d0 -- <filename>

1 files changed, 0 insertions, 311 deletions

diff --git a/src/readahead/readahead-replay.c b/src/readahead/readahead-replay.c
deleted file mode 100644
index a1ac6b0c91..0000000000
--- a/src/readahead/readahead-replay.c
+++ /dev/null
@@ -1,311 +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) {
-        char fn[PATH_MAX];
-        int r = 0, fd = -1;
-        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)
-                        log_warning("open(%s) failed: %m", fn);
-
-        } else if (file_verify(fd, fn, arg_file_size_max, &st) <= 0) {
-                close_nointr_nofail(fd);
-                fd = -1;
-        }
-
-        if (fread(&inode, sizeof(inode), 1, pack) != 1) {
-                log_error("Premature end of pack file.");
-                r = -EIO;
-                goto finish;
-        }
-
-        if (fd >= 0) {
-                /* If the inode changed the file got deleted, so just
-                 * ignore this entry */
-                if (st.st_ino != (uint64_t) inode) {
-                        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 (posix_fadvise(fd, b * page_size(), (c - b) * page_size(), POSIX_FADV_WILLNEED) < 0) {
-                                log_warning("posix_fadvise() 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 (posix_fadvise(fd, 0, st.st_size, POSIX_FADV_WILLNEED) < 0) {
-                        log_warning("posix_fadvise() failed: %m");
-                        goto finish;
-                }
-        }
-
-finish:
-        if (fd >= 0)
-                close_nointr_nofail(fd);
-
-        return r;
-}
-
-static int replay(const char *root) {
-        FILE *pack = NULL;
-        char line[LINE_MAX];
-        int r = 0;
-        char *pack_fn = NULL;
-        int c;
-        bool on_ssd, ready = false;
-        int prio;
-        int inotify_fd = -1;
-
-        assert(root);
-
-        block_bump_request_nr(root);
-
-        if (asprintf(&pack_fn, "%s/.readahead", root) < 0) {
-                r = log_oom();
-                goto finish;
-        }
-
-        pack = fopen(pack_fn, "re");
-        if (!pack) {
-                if (errno == ENOENT)
-                        log_debug("No pack file found.");
-                else {
-                        log_error("Failed to open pack file: %m");
-                        r = -errno;
-                }
-
-                goto finish;
-        }
-
-        posix_fadvise(fileno(pack), 0, 0, POSIX_FADV_WILLNEED);
-
-        if ((inotify_fd = open_inotify()) < 0) {
-                r = inotify_fd;
-                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 READAHEAD_PACK_FILE_VERSION)) {
-                log_debug("Pack file host or version 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
-                /* 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;
-
-                if ((n = read(inotify_fd, &inotify_buffer, sizeof(inotify_buffer))) < 0) {
-                        if (errno != EINTR && errno != EAGAIN) {
-                                log_error("Failed to read inotify event: %m");
-                                r = -errno;
-                                goto finish;
-                        }
-                } 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;
-                        }
-                }
-
-                if ((k = unpack_file(pack)) < 0) {
-                        r = k;
-                        goto finish;
-                }
-
-                if (!ready) {
-                        /* We delay the ready notification until we
-                         * queued at least one read */
-                        sd_notify(0, "READY=1");
-                        ready = true;
-                }
-        }
-
-done:
-        if (!ready)
-                sd_notify(0, "READY=1");
-
-        if (ferror(pack)) {
-                log_error("Failed to read pack file.");
-                r = -EIO;
-                goto finish;
-        }
-
-        log_debug("Done.");
-
-finish:
-        if (pack)
-                fclose(pack);
-
-        if (inotify_fd >= 0)
-                close_nointr_nofail(inotify_fd);
-
-        free(pack_fn);
-
-        return r;
-}
-
-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;
-}