1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2010 ProFUSION embedded systems
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
25 #include <sys/mount.h>
28 #include <linux/loop.h>
29 #include <linux/dm-ioctl.h>
33 #include "mount-setup.h"
37 typedef struct MountPoint {
41 LIST_FIELDS (struct MountPoint, mount_point);
44 static void mount_point_free(MountPoint **head, MountPoint *m) {
48 LIST_REMOVE(MountPoint, mount_point, *head, m);
54 static void mount_points_list_free(MountPoint **head) {
58 mount_point_free(head, *head);
61 static int mount_points_list_get(MountPoint **head) {
62 FILE *proc_self_mountinfo;
69 if (!(proc_self_mountinfo = fopen("/proc/self/mountinfo", "re")))
80 if ((k = fscanf(proc_self_mountinfo,
81 "%*s " /* (1) mount id */
82 "%*s " /* (2) parent id */
83 "%*s " /* (3) major:minor */
85 "%ms " /* (5) mount point */
86 "%*s" /* (6) mount options */
87 "%*[^-]" /* (7) optional fields */
88 "- " /* (8) separator */
89 "%*s " /* (9) file system type */
90 "%*s" /* (10) mount source */
91 "%*s" /* (11) mount options 2 */
92 "%*[^\n]", /* some rubbish at the end */
98 log_warning("Failed to parse /proc/self/mountinfo:%u.", i);
104 /* If we encounter a bind mount, don't try to remount
105 * the source dir too early */
106 skip_ro = !streq(root, "/");
117 if (mount_point_is_api(p) || mount_point_ignore(p)) {
122 if (!(m = new0(MountPoint, 1))) {
129 m->skip_ro = skip_ro;
130 LIST_PREPEND(MountPoint, mount_point, *head, m);
136 fclose(proc_self_mountinfo);
141 static int swap_list_get(MountPoint **head) {
148 if (!(proc_swaps = fopen("/proc/swaps", "re")))
149 return (errno == ENOENT) ? 0 : -errno;
151 (void) fscanf(proc_swaps, "%*s %*s %*s %*s %*s\n");
155 char *dev = NULL, *d;
158 if ((k = fscanf(proc_swaps,
159 "%ms " /* device/file */
160 "%*s " /* type of swap */
161 "%*s " /* swap size */
163 "%*s\n", /* priority */
169 log_warning("Failed to parse /proc/swaps:%u.", i);
175 if (endswith(dev, "(deleted)")) {
188 if (!(swap = new0(MountPoint, 1))) {
195 LIST_PREPEND(MountPoint, mount_point, *head, swap);
206 static int loopback_list_get(MountPoint **head) {
209 struct udev_enumerate *e = NULL;
210 struct udev_list_entry *item = NULL, *first = NULL;
214 if (!(udev = udev_new())) {
219 if (!(e = udev_enumerate_new(udev))) {
224 if (udev_enumerate_add_match_subsystem(e, "block") < 0 ||
225 udev_enumerate_add_match_sysname(e, "loop*") < 0) {
230 if (udev_enumerate_scan_devices(e) < 0) {
235 first = udev_enumerate_get_list_entry(e);
236 udev_list_entry_foreach(item, first) {
238 struct udev_device *d;
242 if (!(d = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item)))) {
247 if (!(dn = udev_device_get_devnode(d))) {
248 udev_device_unref(d);
253 udev_device_unref(d);
260 if (!(lb = new0(MountPoint, 1))) {
267 LIST_PREPEND(MountPoint, mount_point, *head, lb);
274 udev_enumerate_unref(e);
282 static int dm_list_get(MountPoint **head) {
285 struct udev_enumerate *e = NULL;
286 struct udev_list_entry *item = NULL, *first = NULL;
290 if (!(udev = udev_new())) {
295 if (!(e = udev_enumerate_new(udev))) {
300 if (udev_enumerate_add_match_subsystem(e, "block") < 0 ||
301 udev_enumerate_add_match_sysname(e, "dm-*") < 0) {
306 if (udev_enumerate_scan_devices(e) < 0) {
311 first = udev_enumerate_get_list_entry(e);
313 udev_list_entry_foreach(item, first) {
315 struct udev_device *d;
320 if (!(d = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item)))) {
325 devnum = udev_device_get_devnum(d);
326 dn = udev_device_get_devnode(d);
328 if (major(devnum) == 0 || !dn) {
329 udev_device_unref(d);
334 udev_device_unref(d);
341 if (!(m = new(MountPoint, 1))) {
349 LIST_PREPEND(MountPoint, mount_point, *head, m);
356 udev_enumerate_unref(e);
364 static int delete_loopback(const char *device) {
367 if ((fd = open(device, O_RDONLY|O_CLOEXEC)) < 0)
368 return errno == ENOENT ? 0 : -errno;
370 r = ioctl(fd, LOOP_CLR_FD, 0);
371 close_nointr_nofail(fd);
376 /* ENXIO: not bound, so no error */
383 static int delete_dm(dev_t devnum) {
387 assert(major(devnum) != 0);
389 if ((fd = open("/dev/mapper/control", O_RDWR|O_CLOEXEC)) < 0)
393 dm.version[0] = DM_VERSION_MAJOR;
394 dm.version[1] = DM_VERSION_MINOR;
395 dm.version[2] = DM_VERSION_PATCHLEVEL;
397 dm.data_size = sizeof(dm);
400 r = ioctl(fd, DM_DEV_REMOVE, &dm);
401 close_nointr_nofail(fd);
403 return r >= 0 ? 0 : -errno;
406 static int mount_points_list_umount(MountPoint **head, bool *changed, bool log_error) {
412 LIST_FOREACH_SAFE(mount_point, m, n, *head) {
413 if (path_equal(m->path, "/")
414 #ifndef HAVE_SPLIT_USR
415 || path_equal(m->path, "/usr")
422 /* Trying to umount. Forcing to umount if busy (only for NFS mounts) */
423 if (umount2(m->path, MNT_FORCE) == 0) {
424 log_info("Unmounted %s.", m->path);
428 mount_point_free(head, m);
429 } else if (log_error) {
430 log_warning("Could not unmount %s: %m", m->path);
438 static int mount_points_list_remount_read_only(MountPoint **head, bool *changed) {
444 LIST_FOREACH_SAFE(mount_point, m, n, *head) {
451 /* Trying to remount read-only */
452 if (mount(NULL, m->path, NULL, MS_MGC_VAL|MS_REMOUNT|MS_RDONLY, NULL) == 0) {
456 mount_point_free(head, m);
458 log_warning("Could not remount as read-only %s: %m", m->path);
466 static int swap_points_list_off(MountPoint **head, bool *changed) {
472 LIST_FOREACH_SAFE(mount_point, m, n, *head) {
473 if (swapoff(m->path) == 0) {
477 mount_point_free(head, m);
479 log_warning("Could not deactivate swap %s: %m", m->path);
487 static int loopback_points_list_detach(MountPoint **head, bool *changed) {
494 k = lstat("/", &root_st);
496 LIST_FOREACH_SAFE(mount_point, m, n, *head) {
498 struct stat loopback_st;
501 major(root_st.st_dev) != 0 &&
502 lstat(m->path, &loopback_st) >= 0 &&
503 root_st.st_dev == loopback_st.st_rdev) {
508 if ((r = delete_loopback(m->path)) >= 0) {
510 if (r > 0 && changed)
513 mount_point_free(head, m);
515 log_warning("Could not delete loopback %s: %m", m->path);
523 static int dm_points_list_detach(MountPoint **head, bool *changed) {
530 k = lstat("/", &root_st);
532 LIST_FOREACH_SAFE(mount_point, m, n, *head) {
536 major(root_st.st_dev) != 0 &&
537 root_st.st_dev == m->devnum) {
542 if ((r = delete_dm(m->devnum)) >= 0) {
544 if (r > 0 && changed)
547 mount_point_free(head, m);
549 log_warning("Could not delete dm %s: %m", m->path);
557 int umount_all(bool *changed) {
561 LIST_HEAD(MountPoint, mp_list_head);
563 LIST_HEAD_INIT(MountPoint, mp_list_head);
565 r = mount_points_list_get(&mp_list_head);
569 /* retry umount, until nothing can be umounted anymore */
571 umount_changed = false;
573 mount_points_list_umount(&mp_list_head, &umount_changed, false);
577 } while (umount_changed);
579 /* umount one more time with logging enabled */
580 r = mount_points_list_umount(&mp_list_head, &umount_changed, true);
584 r = mount_points_list_remount_read_only(&mp_list_head, changed);
587 mount_points_list_free(&mp_list_head);
592 int swapoff_all(bool *changed) {
594 LIST_HEAD(MountPoint, swap_list_head);
596 LIST_HEAD_INIT(MountPoint, swap_list_head);
598 r = swap_list_get(&swap_list_head);
602 r = swap_points_list_off(&swap_list_head, changed);
605 mount_points_list_free(&swap_list_head);
610 int loopback_detach_all(bool *changed) {
612 LIST_HEAD(MountPoint, loopback_list_head);
614 LIST_HEAD_INIT(MountPoint, loopback_list_head);
616 r = loopback_list_get(&loopback_list_head);
620 r = loopback_points_list_detach(&loopback_list_head, changed);
623 mount_points_list_free(&loopback_list_head);
628 int dm_detach_all(bool *changed) {
630 LIST_HEAD(MountPoint, dm_list_head);
632 LIST_HEAD_INIT(MountPoint, dm_list_head);
634 r = dm_list_get(&dm_list_head);
638 r = dm_points_list_detach(&dm_list_head, changed);
641 mount_points_list_free(&dm_list_head);