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https://github.com/systemd/systemd.git
synced 2024-11-27 20:23:36 +08:00
umount: Adding unmount functions to be used in shutdown
This functions will: - umount all mount points that aren't API - remount read-only all mount points that can't be umounted - umount all swap devices. - detach all loopback devices TODO: - umount dms Mountpoints are being read from /proc/self/mountinfo. Swaps are being read from /proc/swaps. Loop devices from /sys/class/block/loop*.
This commit is contained in:
Fabiano Fidencio
Lennart Poettering
parent
3846aeeba2
commit
e347837975
1
.gitignore
vendored
1
.gitignore
vendored
@ -1,3 +1,4 @@
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systemd-shutdown
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systemd-tmpfiles
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systemd-readahead-collect
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systemd-readahead-replay
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410
src/umount.c
Normal file
410
src/umount.c
Normal file
@ -0,0 +1,410 @@
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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2010 ProFUSION embedded systems
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <errno.h>
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#include <fcntl.h>
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#include <string.h>
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#include <sys/mount.h>
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#include <sys/swap.h>
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#include <unistd.h>
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#include <linux/loop.h>
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#include <libudev.h>
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#include "list.h"
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#include "mount-setup.h"
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#include "umount.h"
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#include "util.h"
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typedef struct MountPoint {
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char *path;
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bool read_only;
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LIST_FIELDS (struct MountPoint, mount_point);
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} MountPoint;
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static MountPoint *mount_point_alloc(char *path) {
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MountPoint *mp;
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if (!(mp = new(MountPoint, 1)))
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return NULL;
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mp->path = path;
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mp->read_only = false;
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return mp;
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}
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static void mount_point_remove_and_free(MountPoint *mount_point, MountPoint **mount_point_list_head) {
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LIST_REMOVE(MountPoint, mount_point, *mount_point_list_head, mount_point);
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free(mount_point->path);
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free(mount_point);
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}
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static void mount_points_list_free(MountPoint **mount_point_list_head) {
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while (*mount_point_list_head)
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mount_point_remove_and_free(*mount_point_list_head, mount_point_list_head);
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}
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static int mount_points_list_get(MountPoint **mount_point_list_head) {
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FILE *proc_self_mountinfo;
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char *path, *p;
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unsigned int i;
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int r;
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if (!(proc_self_mountinfo = fopen("/proc/self/mountinfo", "re")))
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return -errno;
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for (i = 1;; i++) {
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int k;
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MountPoint *mp;
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path = p = NULL;
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if ((k = fscanf(proc_self_mountinfo,
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"%*s " /* (1) mount id */
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"%*s " /* (2) parent id */
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"%*s " /* (3) major:minor */
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"%*s " /* (4) root */
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"%ms " /* (5) mount point */
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"%*s" /* (6) mount options */
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"%*[^-]" /* (7) optional fields */
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"- " /* (8) separator */
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"%*s " /* (9) file system type */
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"%*s" /* (10) mount source */
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"%*s" /* (11) mount options 2 */
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"%*[^\n]", /* some rubbish at the end */
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&path)) != 1) {
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if (k == EOF)
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break;
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log_warning("Failed to parse /proc/self/mountinfo:%u.", i);
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free(path);
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continue;
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}
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if (mount_point_is_api(path)) {
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free(path);
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continue;
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}
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if (!(p = cunescape(path))) {
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r = -ENOMEM;
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goto finish;
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}
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if (!(mp = mount_point_alloc(p))) {
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r = -ENOMEM;
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goto finish;
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}
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LIST_PREPEND(MountPoint, mount_point, *mount_point_list_head, mp);
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free(path);
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}
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r = 0;
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finish:
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fclose(proc_self_mountinfo);
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free(path);
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return r;
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}
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static int swap_list_get(MountPoint **swap_list_head) {
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FILE *proc_swaps;
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unsigned int i;
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int r;
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if (!(proc_swaps = fopen("/proc/swaps", "re")))
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return -errno;
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(void) fscanf(proc_swaps, "%*s %*s %*s %*s %*s\n");
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for (i = 2;; i++) {
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MountPoint *swap;
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char *dev = NULL, *d;
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int k;
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if ((k = fscanf(proc_swaps,
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"%ms " /* device/file */
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"%*s " /* type of swap */
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"%*s " /* swap size */
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"%*s " /* used */
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"%*s\n", /* priority */
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&dev)) != 1) {
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if (k == EOF)
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break;
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log_warning("Failed to parse /proc/swaps:%u.", i);
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free(dev);
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continue;
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}
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if (endswith(dev, "(deleted)")) {
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free(dev);
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continue;
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}
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d = cunescape(dev);
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free(dev);
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if (!d) {
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r = -ENOMEM;
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goto finish;
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}
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swap = mount_point_alloc(d);
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if (!swap) {
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free(d);
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r = -ENOMEM;
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goto finish;
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}
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LIST_PREPEND(MountPoint, mount_point, *swap_list_head, swap);
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}
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r = 0;
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finish:
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fclose(proc_swaps);
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return r;
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}
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static int loopback_list_get(MountPoint **loopback_list_head) {
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int r;
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struct udev *udev;
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struct udev_enumerate *e = NULL;
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struct udev_list_entry *item = NULL, *first = NULL;
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if (!(udev = udev_new())) {
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r = -ENOMEM;
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goto finish;
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}
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if (!(e = udev_enumerate_new(udev))) {
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r = -ENOMEM;
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goto finish;
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}
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if (udev_enumerate_add_match_subsystem(e, "block") < 0) {
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r = -EIO;
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goto finish;
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}
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if (udev_enumerate_add_match_sysname(e, "loop*") < 0) {
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r = -EIO;
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goto finish;
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}
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if (udev_enumerate_scan_devices(e) < 0) {
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r = -EIO;
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goto finish;
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}
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first = udev_enumerate_get_list_entry(e);
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udev_list_entry_foreach(item, first) {
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MountPoint *lb;
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char *loop;
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loop = cunescape(udev_list_entry_get_name(item));
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if (!loop) {
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r = -ENOMEM;
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goto finish;
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}
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lb = mount_point_alloc(loop);
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if (!lb) {
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free(loop);
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r = -ENOMEM;
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goto finish;
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}
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LIST_PREPEND(MountPoint, mount_point, *loopback_list_head, lb);
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}
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r = 0;
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finish:
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if (e)
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udev_enumerate_unref(e);
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free(udev);
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return r;
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}
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static int delete_loopback(const char *device) {
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int fd, r;
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if ((fd = open(device, O_RDONLY|O_CLOEXEC)) < 0) {
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if (errno == ENOENT) {
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log_debug("Loop device %s does not exist.", device);
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errno = 0;
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return 0;
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}
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return -errno;
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}
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ioctl(fd, LOOP_CLR_FD, 0);
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r = errno;
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close_nointr(fd);
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if (r == ENXIO) /* not bound, so no error */
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r = 0;
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errno = r;
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return -errno;
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}
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static int mount_points_list_umount(MountPoint **mount_point_list_head) {
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MountPoint *mp, *mp_next;
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int failed = 0;
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LIST_FOREACH_SAFE(mount_point, mp, mp_next, *mount_point_list_head) {
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if (streq(mp->path, "/"))
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continue;
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/* Trying to umount. Forcing to umount if busy (only for NFS mounts) */
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if (umount2(mp->path, MNT_FORCE) == 0)
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mount_point_remove_and_free(mp, mount_point_list_head);
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else {
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log_debug("Could not unmount %s: %m", mp->path);
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failed++;
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}
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}
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return failed;
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}
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static int mount_points_list_remount_read_only(MountPoint **mount_point_list_head) {
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MountPoint *mp, *mp_next;
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int failed = 0;
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LIST_FOREACH_SAFE(mount_point, mp, mp_next, *mount_point_list_head) {
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if (mp->read_only)
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continue;
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/* Trying to remount read-only */
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if (mount(NULL, mp->path, NULL, MS_MGC_VAL|MS_REMOUNT|MS_RDONLY, NULL) == 0) {
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mp->read_only = true;
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mount_point_remove_and_free(mp, mount_point_list_head);
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} else {
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log_debug("Could not remount as read-only %s: %m", mp->path);
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failed++;
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}
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}
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return failed;
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}
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static int swap_points_list_off(MountPoint **swap_list_head) {
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MountPoint *swap, *swap_next;
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int failed = 0;
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LIST_FOREACH_SAFE(mount_point, swap, swap_next, *swap_list_head) {
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if (swapoff(swap->path) == 0)
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mount_point_remove_and_free(swap, swap_list_head);
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else {
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log_debug("Could not swapoff %s: %m", swap->path);
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failed++;
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}
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}
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return failed;
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}
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static int loopback_points_list_detach(MountPoint **loopback_list_head) {
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MountPoint *loopback, *loopback_next;
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int failed = 0;
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LIST_FOREACH_SAFE(mount_point, loopback, loopback_next, *loopback_list_head) {
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if (delete_loopback(loopback->path) == 0)
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mount_point_remove_and_free(loopback, loopback_list_head);
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else {
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log_debug("Could not delete loopback %s: %m", loopback->path);
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failed++;
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}
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}
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return failed;
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}
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int umount_all(void) {
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int r;
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LIST_HEAD(MountPoint, mp_list_head);
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LIST_HEAD_INIT(MountPoint, mp_list_head);
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r = mount_points_list_get(&mp_list_head);
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if (r < 0)
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goto end;
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r = mount_points_list_umount(&mp_list_head);
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if (r <= 0)
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goto end;
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r = mount_points_list_remount_read_only(&mp_list_head);
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end:
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mount_points_list_free(&mp_list_head);
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return r;
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}
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int swapoff_all(void) {
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int r;
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LIST_HEAD(MountPoint, swap_list_head);
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LIST_HEAD_INIT(MountPoint, swap_list_head);
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r = swap_list_get(&swap_list_head);
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if (r < 0)
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goto end;
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r = swap_points_list_off(&swap_list_head);
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end:
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mount_points_list_free(&swap_list_head);
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return r;
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}
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int loopback_detach_all(void) {
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int r;
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LIST_HEAD(MountPoint, loopback_list_head);
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LIST_HEAD_INIT(MountPoint, loopback_list_head);
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r = loopback_list_get(&loopback_list_head);
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if (r < 0)
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goto end;
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r = loopback_points_list_detach(&loopback_list_head);
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end:
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mount_points_list_free(&loopback_list_head);
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return r;
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}
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31
src/umount.h
Normal file
31
src/umount.h
Normal file
@ -0,0 +1,31 @@
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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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#ifndef fooumounthfoo
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#define fooumounthfoo
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/***
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This file is part of systemd.
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Copyright 2010 ProFUSION embedded systems
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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
|
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(at your option) any later version.
|
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|
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systemd is distributed in the hope that it will be useful, but
|
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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.
|
||||
|
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You should have received a copy of the GNU General Public License
|
||||
along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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int umount_all(void);
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int swapoff_all(void);
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int loopback_detach_all(void);
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#endif
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Block a user