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 if (!streq(root, "/"))
119 if (mount_point_is_api(p) || mount_point_ignore(p)) {
124 if (!(m = new0(MountPoint, 1))) {
131 m->skip_ro = skip_ro;
132 LIST_PREPEND(MountPoint, mount_point, *head, m);
138 fclose(proc_self_mountinfo);
143 static int swap_list_get(MountPoint **head) {
150 if (!(proc_swaps = fopen("/proc/swaps", "re")))
153 (void) fscanf(proc_swaps, "%*s %*s %*s %*s %*s\n");
157 char *dev = NULL, *d;
160 if ((k = fscanf(proc_swaps,
161 "%ms " /* device/file */
162 "%*s " /* type of swap */
163 "%*s " /* swap size */
165 "%*s\n", /* priority */
171 log_warning("Failed to parse /proc/swaps:%u.", i);
177 if (endswith(dev, "(deleted)")) {
190 if (!(swap = new0(MountPoint, 1))) {
197 LIST_PREPEND(MountPoint, mount_point, *head, swap);
208 static int loopback_list_get(MountPoint **head) {
211 struct udev_enumerate *e = NULL;
212 struct udev_list_entry *item = NULL, *first = NULL;
216 if (!(udev = udev_new())) {
221 if (!(e = udev_enumerate_new(udev))) {
226 if (udev_enumerate_add_match_subsystem(e, "block") < 0 ||
227 udev_enumerate_add_match_sysname(e, "loop*") < 0) {
232 if (udev_enumerate_scan_devices(e) < 0) {
237 first = udev_enumerate_get_list_entry(e);
238 udev_list_entry_foreach(item, first) {
240 struct udev_device *d;
244 if (!(d = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item)))) {
249 if (!(dn = udev_device_get_devnode(d))) {
250 udev_device_unref(d);
255 udev_device_unref(d);
262 if (!(lb = new0(MountPoint, 1))) {
269 LIST_PREPEND(MountPoint, mount_point, *head, lb);
276 udev_enumerate_unref(e);
284 static int dm_list_get(MountPoint **head) {
287 struct udev_enumerate *e = NULL;
288 struct udev_list_entry *item = NULL, *first = NULL;
292 if (!(udev = udev_new())) {
297 if (!(e = udev_enumerate_new(udev))) {
302 if (udev_enumerate_add_match_subsystem(e, "block") < 0 ||
303 udev_enumerate_add_match_sysname(e, "dm-*") < 0) {
308 if (udev_enumerate_scan_devices(e) < 0) {
313 first = udev_enumerate_get_list_entry(e);
315 udev_list_entry_foreach(item, first) {
317 struct udev_device *d;
322 if (!(d = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item)))) {
327 devnum = udev_device_get_devnum(d);
328 dn = udev_device_get_devnode(d);
330 if (major(devnum) == 0 || !dn) {
331 udev_device_unref(d);
336 udev_device_unref(d);
343 if (!(m = new(MountPoint, 1))) {
351 LIST_PREPEND(MountPoint, mount_point, *head, m);
358 udev_enumerate_unref(e);
366 static int delete_loopback(const char *device) {
369 if ((fd = open(device, O_RDONLY|O_CLOEXEC)) < 0)
370 return errno == ENOENT ? 0 : -errno;
372 r = ioctl(fd, LOOP_CLR_FD, 0);
373 close_nointr_nofail(fd);
378 /* ENXIO: not bound, so no error */
385 static int delete_dm(dev_t devnum) {
389 assert(major(devnum) != 0);
391 if ((fd = open("/dev/mapper/control", O_RDWR|O_CLOEXEC)) < 0)
395 dm.version[0] = DM_VERSION_MAJOR;
396 dm.version[1] = DM_VERSION_MINOR;
397 dm.version[2] = DM_VERSION_PATCHLEVEL;
399 dm.data_size = sizeof(dm);
402 r = ioctl(fd, DM_DEV_REMOVE, &dm);
403 close_nointr_nofail(fd);
405 return r >= 0 ? 0 : -errno;
408 static int mount_points_list_umount(MountPoint **head, bool *changed) {
414 LIST_FOREACH_SAFE(mount_point, m, n, *head) {
415 if (streq(m->path, "/")) {
420 /* Trying to umount. Forcing to umount if busy (only for NFS mounts) */
421 if (umount2(m->path, MNT_FORCE) == 0) {
425 mount_point_free(head, m);
427 log_warning("Could not unmount %s: %m", m->path);
435 static int mount_points_list_remount_read_only(MountPoint **head, bool *changed) {
441 LIST_FOREACH_SAFE(mount_point, m, n, *head) {
448 /* Trying to remount read-only */
449 if (mount(NULL, m->path, NULL, MS_MGC_VAL|MS_REMOUNT|MS_RDONLY, NULL) == 0) {
453 mount_point_free(head, m);
455 log_warning("Could not remount as read-only %s: %m", m->path);
463 static int swap_points_list_off(MountPoint **head, bool *changed) {
469 LIST_FOREACH_SAFE(mount_point, m, n, *head) {
470 if (swapoff(m->path) == 0) {
474 mount_point_free(head, m);
476 log_warning("Could not deactivate swap %s: %m", m->path);
484 static int loopback_points_list_detach(MountPoint **head, bool *changed) {
491 k = lstat("/", &root_st);
493 LIST_FOREACH_SAFE(mount_point, m, n, *head) {
495 struct stat loopback_st;
498 major(root_st.st_dev) != 0 &&
499 lstat(m->path, &loopback_st) >= 0 &&
500 root_st.st_dev == loopback_st.st_rdev) {
505 if ((r = delete_loopback(m->path)) >= 0) {
507 if (r > 0 && changed)
510 mount_point_free(head, m);
512 log_warning("Could not delete loopback %s: %m", m->path);
520 static int dm_points_list_detach(MountPoint **head, bool *changed) {
527 k = lstat("/", &root_st);
529 LIST_FOREACH_SAFE(mount_point, m, n, *head) {
533 major(root_st.st_dev) != 0 &&
534 root_st.st_dev == m->devnum) {
539 if ((r = delete_dm(m->devnum)) >= 0) {
541 if (r > 0 && changed)
544 mount_point_free(head, m);
546 log_warning("Could not delete dm %s: %m", m->path);
554 int umount_all(bool *changed) {
556 LIST_HEAD(MountPoint, mp_list_head);
558 LIST_HEAD_INIT(MountPoint, mp_list_head);
560 r = mount_points_list_get(&mp_list_head);
564 r = mount_points_list_umount(&mp_list_head, changed);
568 r = mount_points_list_remount_read_only(&mp_list_head, changed);
571 mount_points_list_free(&mp_list_head);
576 int swapoff_all(bool *changed) {
578 LIST_HEAD(MountPoint, swap_list_head);
580 LIST_HEAD_INIT(MountPoint, swap_list_head);
582 r = swap_list_get(&swap_list_head);
586 r = swap_points_list_off(&swap_list_head, changed);
589 mount_points_list_free(&swap_list_head);
594 int loopback_detach_all(bool *changed) {
596 LIST_HEAD(MountPoint, loopback_list_head);
598 LIST_HEAD_INIT(MountPoint, loopback_list_head);
600 r = loopback_list_get(&loopback_list_head);
604 r = loopback_points_list_detach(&loopback_list_head, changed);
607 mount_points_list_free(&loopback_list_head);
612 int dm_detach_all(bool *changed) {
614 LIST_HEAD(MountPoint, dm_list_head);
616 LIST_HEAD_INIT(MountPoint, dm_list_head);
618 r = dm_list_get(&dm_list_head);
622 r = dm_points_list_detach(&dm_list_head, changed);
625 mount_points_list_free(&dm_list_head);