+++ /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 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 <stdlib.h>
-#include <string.h>
-#include <sys/sysinfo.h>
-#include <sys/inotify.h>
-#include <fcntl.h>
-#include <sys/mman.h>
-#include <unistd.h>
-#include <libudev.h>
-
-#include "log.h"
-#include "readahead-common.h"
-#include "util.h"
-
-int file_verify(int fd, const char *fn, off_t file_size_max, struct stat *st) {
- assert(fd >= 0);
- assert(fn);
- assert(st);
-
- if (fstat(fd, st) < 0) {
- log_warning("fstat(%s) failed: %m", fn);
- return -errno;
- }
-
- if (!S_ISREG(st->st_mode)) {
- log_debug("Not preloading special file %s", fn);
- return 0;
- }
-
- if (st->st_size <= 0 || st->st_size > file_size_max) {
- log_debug("Not preloading file %s with size out of bounds %llu", fn, (unsigned long long) st->st_size);
- return 0;
- }
-
- return 1;
-}
-
-int fs_on_ssd(const char *p) {
- struct stat st;
- struct udev *udev = NULL;
- struct udev_device *udev_device = NULL, *look_at = NULL;
- bool b = false;
- const char *devtype, *rotational, *model, *id;
-
- assert(p);
-
- if (stat(p, &st) < 0)
- return -errno;
-
- if (major(st.st_dev) == 0)
- return false;
-
- if (!(udev = udev_new()))
- return -ENOMEM;
-
- if (!(udev_device = udev_device_new_from_devnum(udev, 'b', st.st_dev)))
- goto finish;
-
- if ((devtype = udev_device_get_property_value(udev_device, "DEVTYPE")) &&
- streq(devtype, "partition"))
- look_at = udev_device_get_parent(udev_device);
- else
- look_at = udev_device;
-
- if (!look_at)
- goto finish;
-
- /* First, try high-level property */
- if ((id = udev_device_get_property_value(look_at, "ID_SSD"))) {
- b = streq(id, "1");
- goto finish;
- }
-
- /* Second, try kernel attribute */
- if ((rotational = udev_device_get_sysattr_value(look_at, "queue/rotational")))
- if ((b = streq(rotational, "0")))
- goto finish;
-
- /* Finally, fallback to heuristics */
- if (!(look_at = udev_device_get_parent(look_at)))
- goto finish;
-
- if ((model = udev_device_get_sysattr_value(look_at, "model")))
- b = !!strstr(model, "SSD");
-
-finish:
- if (udev_device)
- udev_device_unref(udev_device);
-
- if (udev)
- udev_unref(udev);
-
- return b;
-}
-
-int fs_on_read_only(const char *p) {
- struct stat st;
- struct udev *udev = NULL;
- struct udev_device *udev_device = NULL;
- bool b = false;
- const char *read_only;
-
- assert(p);
-
- if (stat(p, &st) < 0)
- return -errno;
-
- if (major(st.st_dev) == 0)
- return false;
-
- if (!(udev = udev_new()))
- return -ENOMEM;
-
- if (!(udev_device = udev_device_new_from_devnum(udev, 'b', st.st_dev)))
- goto finish;
-
- if ((read_only = udev_device_get_sysattr_value(udev_device, "ro")))
- if ((b = streq(read_only, "1")))
- goto finish;
-
-finish:
- if (udev_device)
- udev_device_unref(udev_device);
-
- if (udev)
- udev_unref(udev);
-
- return b;
-}
-
-bool enough_ram(void) {
- struct sysinfo si;
-
- assert_se(sysinfo(&si) >= 0);
-
- /* Enable readahead only with at least 128MB memory */
- return si.totalram > 127 * 1024*1024 / si.mem_unit;
-}
-
-int open_inotify(void) {
- int fd;
-
- if ((fd = inotify_init1(IN_CLOEXEC|IN_NONBLOCK)) < 0) {
- log_error("Failed to create inotify handle: %m");
- return -errno;
- }
-
- mkdir("/run/systemd", 0755);
- mkdir("/run/systemd/readahead", 0755);
-
- if (inotify_add_watch(fd, "/run/systemd/readahead", IN_CREATE) < 0) {
- log_error("Failed to watch /run/systemd/readahead: %m");
- close_nointr_nofail(fd);
- return -errno;
- }
-
- return fd;
-}
-
-ReadaheadShared *shared_get(void) {
- int fd;
- ReadaheadShared *m = NULL;
-
- mkdir("/run/systemd", 0755);
- mkdir("/run/systemd/readahead", 0755);
-
- if ((fd = open("/run/systemd/readahead/shared", O_CREAT|O_RDWR|O_CLOEXEC, 0644)) < 0) {
- log_error("Failed to create shared memory segment: %m");
- goto finish;
- }
-
- if (ftruncate(fd, sizeof(ReadaheadShared)) < 0) {
- log_error("Failed to truncate shared memory segment: %m");
- goto finish;
- }
-
- if ((m = mmap(NULL, sizeof(ReadaheadShared), PROT_WRITE|PROT_READ, MAP_SHARED, fd, 0)) == MAP_FAILED) {
- log_error("Failed to mmap shared memory segment: %m");
- m = NULL;
- goto finish;
- }
-
-finish:
- if (fd >= 0)
- close_nointr_nofail(fd);
-
- return m;
-}
-
-#define BUMP_REQUEST_NR (16*1024)
-
-int bump_request_nr(const char *p) {
- struct stat st;
- uint64_t u;
- char *ap = NULL, *line = NULL;
- int r;
- dev_t d;
-
- assert(p);
-
- if (stat(p, &st) < 0)
- return -errno;
-
- if (major(st.st_dev) == 0)
- return 0;
-
- d = st.st_dev;
- block_get_whole_disk(d, &d);
-
- if (asprintf(&ap, "/sys/dev/block/%u:%u/queue/nr_requests", major(d), minor(d)) < 0) {
- r= -ENOMEM;
- goto finish;
- }
-
- r = read_one_line_file(ap, &line);
- if (r < 0) {
- if (r == -ENOENT)
- r = 0;
- goto finish;
- }
-
- r = safe_atou64(line, &u);
- if (r >= 0 && u >= BUMP_REQUEST_NR) {
- r = 0;
- goto finish;
- }
-
- free(line);
- line = NULL;
-
- if (asprintf(&line, "%lu", (unsigned long) BUMP_REQUEST_NR) < 0) {
- r = -ENOMEM;
- goto finish;
- }
-
- r = write_one_line_file(ap, line);
- if (r < 0)
- goto finish;
-
- log_info("Bumped block_nr parameter of %u:%u to %lu. This is a temporary hack and should be removed one day.", major(d), minor(d), (unsigned long) BUMP_REQUEST_NR);
- r = 1;
-
-finish:
- free(ap);
- free(line);
-
- return r;
-}
~ianmdlvl / elogind.git / blobdiff