/* SPDX-License-Identifier: LGPL-2.1-or-later */ /*** Copyright © 2010 ProFUSION embedded systems ***/ #include #include #include #include #include #include #include #include #include #include #include #if HAVE_VALGRIND_MEMCHECK_H #include #endif #include "sd-device.h" #include "alloc-util.h" #include "blockdev-util.h" #include "constants.h" #include "device-util.h" #include "dirent-util.h" #include "escape.h" #include "fd-util.h" #include "fileio.h" #include "fs-util.h" #include "fstab-util.h" #include "libmount-util.h" #include "mount-setup.h" #include "mount-util.h" #include "mountpoint-util.h" #include "parse-util.h" #include "path-util.h" #include "process-util.h" #include "signal-util.h" #include "string-util.h" #include "strv.h" #include "sync-util.h" #include "umount.h" #include "virt.h" static void mount_point_free(MountPoint **head, MountPoint *m) { assert(head); assert(m); LIST_REMOVE(mount_point, *head, m); free(m->path); free(m->remount_options); free(m); } void mount_points_list_free(MountPoint **head) { assert(head); while (*head) mount_point_free(head, *head); } int mount_points_list_get(const char *mountinfo, MountPoint **head) { _cleanup_(mnt_free_tablep) struct libmnt_table *table = NULL; _cleanup_(mnt_free_iterp) struct libmnt_iter *iter = NULL; int r; assert(head); r = libmount_parse(mountinfo, NULL, &table, &iter); if (r < 0) return log_error_errno(r, "Failed to parse %s: %m", mountinfo ?: "/proc/self/mountinfo"); for (;;) { _cleanup_free_ char *options = NULL, *remount_options = NULL; struct libmnt_fs *fs; const char *path, *fstype; unsigned long remount_flags = 0u; bool try_remount_ro, is_api_vfs; _cleanup_free_ MountPoint *m = NULL; r = mnt_table_next_fs(table, iter, &fs); if (r == 1) /* EOF */ break; if (r < 0) return log_error_errno(r, "Failed to get next entry from %s: %m", mountinfo ?: "/proc/self/mountinfo"); path = mnt_fs_get_target(fs); if (!path) continue; fstype = mnt_fs_get_fstype(fs); /* Combine the generic VFS options with the FS-specific options. Duplicates are not a problem * here, because the only options that should come up twice are typically ro/rw, which are * turned into MS_RDONLY or the inversion of it. * * Even if there are duplicates later in mount_option_mangle() they shouldn't hurt anyways as * they override each other. */ if (!strextend_with_separator(&options, ",", mnt_fs_get_vfs_options(fs))) return log_oom(); if (!strextend_with_separator(&options, ",", mnt_fs_get_fs_options(fs))) return log_oom(); /* Ignore mount points we can't unmount because they are API or because we are keeping them * open (like /dev/console). Also, ignore all mounts below API file systems, since they are * likely virtual too, and hence not worth spending time on. Also, in unprivileged containers * we might lack the rights to unmount these things, hence don't bother. */ if (mount_point_is_api(path) || mount_point_ignore(path) || PATH_STARTSWITH_SET(path, "/dev", "/sys", "/proc")) continue; is_api_vfs = fstype_is_api_vfs(fstype); /* If we are in a container, don't attempt to read-only mount anything as that brings no real * benefits, but might confuse the host, as we remount the superblock here, not the bind * mount. * * If the filesystem is a network fs, also skip the remount. It brings no value (we cannot * leave a "dirty fs") and could hang if the network is down. Note that umount2() is more * careful and will not hang because of the network being down. */ try_remount_ro = detect_container() <= 0 && !fstype_is_network(fstype) && !is_api_vfs && !fstype_is_ro(fstype) && !fstab_test_yes_no_option(options, "ro\0rw\0"); if (try_remount_ro) { /* mount(2) states that mount flags and options need to be exactly the same as they * were when the filesystem was mounted, except for the desired changes. So we * reconstruct both here and adjust them for the later remount call too. */ r = mnt_fs_get_propagation(fs, &remount_flags); if (r < 0) { log_warning_errno(r, "mnt_fs_get_propagation() failed for %s, ignoring: %m", path); continue; } r = mount_option_mangle(options, remount_flags, &remount_flags, &remount_options); if (r < 0) { log_warning_errno(r, "mount_option_mangle failed for %s, ignoring: %m", path); continue; } /* MS_BIND is special. If it is provided it will only make the mount-point * read-only. If left out, the super block itself is remounted, which we want. */ remount_flags = (remount_flags|MS_REMOUNT|MS_RDONLY) & ~MS_BIND; } m = new(MountPoint, 1); if (!m) return log_oom(); *m = (MountPoint) { .remount_options = remount_options, .remount_flags = remount_flags, .try_remount_ro = try_remount_ro, /* Unmount sysfs/procfs/… lazily, since syncing doesn't matter there, and it's OK if * something keeps an fd open to it. */ .umount_lazily = is_api_vfs, }; m->path = strdup(path); if (!m->path) return log_oom(); TAKE_PTR(remount_options); LIST_PREPEND(mount_point, *head, TAKE_PTR(m)); } return 0; } int swap_list_get(const char *swaps, MountPoint **head) { _cleanup_(mnt_free_tablep) struct libmnt_table *t = NULL; _cleanup_(mnt_free_iterp) struct libmnt_iter *i = NULL; int r; assert(head); t = mnt_new_table(); i = mnt_new_iter(MNT_ITER_FORWARD); if (!t || !i) return log_oom(); r = mnt_table_parse_swaps(t, swaps); if (r == -ENOENT) /* no /proc/swaps is fine */ return 0; if (r < 0) return log_error_errno(r, "Failed to parse %s: %m", swaps ?: "/proc/swaps"); for (;;) { struct libmnt_fs *fs; _cleanup_free_ MountPoint *swap = NULL; const char *source; r = mnt_table_next_fs(t, i, &fs); if (r == 1) /* EOF */ break; if (r < 0) return log_error_errno(r, "Failed to get next entry from %s: %m", swaps ?: "/proc/swaps"); source = mnt_fs_get_source(fs); if (!source) continue; swap = new0(MountPoint, 1); if (!swap) return log_oom(); swap->path = strdup(source); if (!swap->path) return log_oom(); LIST_PREPEND(mount_point, *head, TAKE_PTR(swap)); } return 0; } static int loopback_list_get(MountPoint **head) { _cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL; sd_device *d; int r; assert(head); r = sd_device_enumerator_new(&e); if (r < 0) return r; r = sd_device_enumerator_allow_uninitialized(e); if (r < 0) return r; r = sd_device_enumerator_add_match_subsystem(e, "block", true); if (r < 0) return r; r = sd_device_enumerator_add_match_sysname(e, "loop*"); if (r < 0) return r; r = sd_device_enumerator_add_match_sysattr(e, "loop/backing_file", NULL, true); if (r < 0) return r; FOREACH_DEVICE(e, d) { _cleanup_free_ char *p = NULL; const char *dn; MountPoint *lb; dev_t devnum; if (sd_device_get_devnum(d, &devnum) < 0 || sd_device_get_devname(d, &dn) < 0) continue; p = strdup(dn); if (!p) return -ENOMEM; lb = new(MountPoint, 1); if (!lb) return -ENOMEM; *lb = (MountPoint) { .path = TAKE_PTR(p), .devnum = devnum, }; LIST_PREPEND(mount_point, *head, lb); } return 0; } static int dm_list_get(MountPoint **head) { _cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL; sd_device *d; int r; assert(head); r = sd_device_enumerator_new(&e); if (r < 0) return r; r = sd_device_enumerator_allow_uninitialized(e); if (r < 0) return r; r = sd_device_enumerator_add_match_subsystem(e, "block", true); if (r < 0) return r; r = sd_device_enumerator_add_match_sysname(e, "dm-*"); if (r < 0) return r; FOREACH_DEVICE(e, d) { _cleanup_free_ char *p = NULL; const char *dn; MountPoint *m; dev_t devnum; if (sd_device_get_devnum(d, &devnum) < 0 || sd_device_get_devname(d, &dn) < 0) continue; p = strdup(dn); if (!p) return -ENOMEM; m = new(MountPoint, 1); if (!m) return -ENOMEM; *m = (MountPoint) { .path = TAKE_PTR(p), .devnum = devnum, }; LIST_PREPEND(mount_point, *head, m); } return 0; } static int md_list_get(MountPoint **head) { _cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL; sd_device *d; int r; assert(head); r = sd_device_enumerator_new(&e); if (r < 0) return r; r = sd_device_enumerator_allow_uninitialized(e); if (r < 0) return r; r = sd_device_enumerator_add_match_subsystem(e, "block", true); if (r < 0) return r; r = sd_device_enumerator_add_match_sysname(e, "md*"); if (r < 0) return r; /* Filter out partitions. */ r = sd_device_enumerator_add_match_property(e, "DEVTYPE", "disk"); if (r < 0) return r; FOREACH_DEVICE(e, d) { _cleanup_free_ char *p = NULL; const char *dn, *md_level; MountPoint *m; dev_t devnum; if (sd_device_get_devnum(d, &devnum) < 0 || sd_device_get_devname(d, &dn) < 0) continue; r = sd_device_get_property_value(d, "MD_LEVEL", &md_level); if (r < 0) { log_warning_errno(r, "Failed to get MD_LEVEL property for %s, ignoring: %m", dn); continue; } /* MD "containers" are a special type of MD devices, used for external metadata. Since it * doesn't provide RAID functionality in itself we don't need to stop it. */ if (streq(md_level, "container")) continue; p = strdup(dn); if (!p) return -ENOMEM; m = new(MountPoint, 1); if (!m) return -ENOMEM; *m = (MountPoint) { .path = TAKE_PTR(p), .devnum = devnum, }; LIST_PREPEND(mount_point, *head, m); } return 0; } static int delete_loopback(const char *device) { _cleanup_close_ int fd = -1; struct loop_info64 info; assert(device); fd = open(device, O_RDONLY|O_CLOEXEC); if (fd < 0) { log_debug_errno(errno, "Failed to open loopback device %s: %m", device); return errno == ENOENT ? 0 : -errno; } /* Loopback block devices don't sync in-flight blocks when we clear the fd, hence sync explicitly * first */ if (fsync(fd) < 0) log_debug_errno(errno, "Failed to sync loop block device %s, ignoring: %m", device); if (ioctl(fd, LOOP_CLR_FD, 0) < 0) { if (errno == ENXIO) /* Nothing bound, didn't do anything */ return 0; if (errno != EBUSY) return log_debug_errno(errno, "Failed to clear loopback device %s: %m", device); if (ioctl(fd, LOOP_GET_STATUS64, &info) < 0) { if (errno == ENXIO) /* What? Suddenly detached after all? That's fine by us then. */ return 1; log_debug_errno(errno, "Failed to invoke LOOP_GET_STATUS64 on loopback device %s, ignoring: %m", device); return -EBUSY; /* propagate original error */ } #if HAVE_VALGRIND_MEMCHECK_H VALGRIND_MAKE_MEM_DEFINED(&info, sizeof(info)); #endif if (FLAGS_SET(info.lo_flags, LO_FLAGS_AUTOCLEAR)) /* someone else already set LO_FLAGS_AUTOCLEAR for us? fine by us */ return -EBUSY; /* propagate original error */ info.lo_flags |= LO_FLAGS_AUTOCLEAR; if (ioctl(fd, LOOP_SET_STATUS64, &info) < 0) { if (errno == ENXIO) /* Suddenly detached after all? Fine by us */ return 1; log_debug_errno(errno, "Failed to set LO_FLAGS_AUTOCLEAR flag for loop device %s, ignoring: %m", device); } else log_debug("Successfully set LO_FLAGS_AUTOCLEAR flag for loop device %s.", device); return -EBUSY; } if (ioctl(fd, LOOP_GET_STATUS64, &info) < 0) { /* If the LOOP_CLR_FD above succeeded we'll see ENXIO here. */ if (errno == ENXIO) log_debug("Successfully detached loopback device %s.", device); else log_debug_errno(errno, "Failed to invoke LOOP_GET_STATUS64 on loopback device %s, ignoring: %m", device); /* the LOOP_CLR_FD at least worked, let's hope for the best */ return 1; } #if HAVE_VALGRIND_MEMCHECK_H VALGRIND_MAKE_MEM_DEFINED(&info, sizeof(info)); #endif /* Linux makes LOOP_CLR_FD succeed whenever LO_FLAGS_AUTOCLEAR is set without actually doing * anything. Very confusing. Let's hence not claim we did anything in this case. */ if (FLAGS_SET(info.lo_flags, LO_FLAGS_AUTOCLEAR)) log_debug("Successfully called LOOP_CLR_FD on a loopback device %s with autoclear set, which is a NOP.", device); else log_debug("Weird, LOOP_CLR_FD succeeded but the device is still attached on %s.", device); return -EBUSY; /* Nothing changed, the device is still attached, hence it apparently is still busy */ } static int delete_dm(MountPoint *m) { _cleanup_close_ int fd = -1; int r; assert(m); assert(major(m->devnum) != 0); assert(m->path); fd = open("/dev/mapper/control", O_RDWR|O_CLOEXEC); if (fd < 0) return -errno; r = fsync_path_at(AT_FDCWD, m->path); if (r < 0) log_debug_errno(r, "Failed to sync DM block device %s, ignoring: %m", m->path); return RET_NERRNO(ioctl(fd, DM_DEV_REMOVE, &(struct dm_ioctl) { .version = { DM_VERSION_MAJOR, DM_VERSION_MINOR, DM_VERSION_PATCHLEVEL }, .data_size = sizeof(struct dm_ioctl), .dev = m->devnum, })); } static int delete_md(MountPoint *m) { _cleanup_close_ int fd = -1; assert(m); assert(major(m->devnum) != 0); assert(m->path); fd = open(m->path, O_RDONLY|O_CLOEXEC|O_EXCL); if (fd < 0) return -errno; if (fsync(fd) < 0) log_debug_errno(errno, "Failed to sync MD block device %s, ignoring: %m", m->path); return RET_NERRNO(ioctl(fd, STOP_ARRAY, NULL)); } static bool nonunmountable_path(const char *path) { return path_equal(path, "/") #if ! HAVE_SPLIT_USR || path_equal(path, "/usr") #endif || path_startswith(path, "/run/initramfs"); } static void log_umount_blockers(const char *mnt) { _cleanup_free_ char *blockers = NULL; int r; _cleanup_closedir_ DIR *dir = opendir("/proc"); if (!dir) return (void) log_warning_errno(errno, "Failed to open /proc/: %m"); FOREACH_DIRENT_ALL(de, dir, break) { if (!IN_SET(de->d_type, DT_DIR, DT_UNKNOWN)) continue; pid_t pid; if (parse_pid(de->d_name, &pid) < 0) continue; _cleanup_free_ char *fdp = path_join(de->d_name, "fd"); if (!fdp) return (void) log_oom(); _cleanup_closedir_ DIR *fd_dir = xopendirat(dirfd(dir), fdp, 0); if (!fd_dir) { if (errno != ENOENT) /* process gone by now? */ log_debug_errno(errno, "Failed to open /proc/%s/, ignoring: %m",fdp); continue; } bool culprit = false; FOREACH_DIRENT(fd_de, fd_dir, break) { _cleanup_free_ char *open_file = NULL; r = readlinkat_malloc(dirfd(fd_dir), fd_de->d_name, &open_file); if (r < 0) { if (r != -ENOENT) /* fd closed by now */ log_debug_errno(r, "Failed to read link /proc/%s/%s, ignoring: %m", fdp, fd_de->d_name); continue; } if (path_startswith(open_file, mnt)) { culprit = true; break; } } if (!culprit) continue; _cleanup_free_ char *comm = NULL; r = get_process_comm(pid, &comm); if (r < 0) { if (r != -ESRCH) /* process gone by now */ log_debug_errno(r, "Failed to read process name of PID " PID_FMT ": %m", pid); continue; } if (!strextend_with_separator(&blockers, ", ", comm)) return (void) log_oom(); if (!strextend(&blockers, "(", de->d_name, ")")) return (void) log_oom(); } if (blockers) log_warning("Unmounting '%s' blocked by: %s", mnt, blockers); } static int remount_with_timeout(MountPoint *m, bool last_try) { pid_t pid; int r; BLOCK_SIGNALS(SIGCHLD); assert(m); /* Due to the possibility of a remount operation hanging, we fork a child process and set a * timeout. If the timeout lapses, the assumption is that the particular remount failed. */ r = safe_fork("(sd-remount)", FORK_RESET_SIGNALS|FORK_CLOSE_ALL_FDS|FORK_LOG|FORK_REOPEN_LOG, &pid); if (r < 0) return r; if (r == 0) { log_info("Remounting '%s' read-only with options '%s'.", m->path, strempty(m->remount_options)); /* Start the mount operation here in the child */ r = mount(NULL, m->path, NULL, m->remount_flags, m->remount_options); if (r < 0) log_full_errno(last_try ? LOG_ERR : LOG_INFO, errno, "Failed to remount '%s' read-only: %m", m->path); _exit(r < 0 ? EXIT_FAILURE : EXIT_SUCCESS); } r = wait_for_terminate_with_timeout(pid, DEFAULT_TIMEOUT_USEC); if (r == -ETIMEDOUT) { log_error_errno(r, "Remounting '%s' timed out, issuing SIGKILL to PID " PID_FMT ".", m->path, pid); (void) kill(pid, SIGKILL); } else if (r == -EPROTO) log_debug_errno(r, "Remounting '%s' failed abnormally, child process " PID_FMT " aborted or exited non-zero.", m->path, pid); else if (r < 0) log_error_errno(r, "Remounting '%s' failed unexpectedly, couldn't wait for child process " PID_FMT ": %m", m->path, pid); return r; } static int umount_with_timeout(MountPoint *m, bool last_try) { pid_t pid; int r; BLOCK_SIGNALS(SIGCHLD); assert(m); /* Due to the possibility of a umount operation hanging, we fork a child process and set a * timeout. If the timeout lapses, the assumption is that the particular umount failed. */ r = safe_fork("(sd-umount)", FORK_RESET_SIGNALS|FORK_CLOSE_ALL_FDS|FORK_LOG|FORK_REOPEN_LOG, &pid); if (r < 0) return r; if (r == 0) { log_info("Unmounting '%s'.", m->path); /* Start the mount operation here in the child Using MNT_FORCE causes some filesystems * (e.g. FUSE and NFS and other network filesystems) to abort any pending requests and return * -EIO rather than blocking indefinitely. If the filesysten is "busy", this may allow * processes to die, thus making the filesystem less busy so the unmount might succeed * (rather than return EBUSY). */ r = RET_NERRNO(umount2(m->path, UMOUNT_NOFOLLOW | /* Don't follow symlinks: this should never happen unless our mount list was wrong */ (m->umount_lazily ? MNT_DETACH : MNT_FORCE))); if (r < 0) { log_full_errno(last_try ? LOG_ERR : LOG_INFO, r, "Failed to unmount %s: %m", m->path); if (r == -EBUSY && last_try) log_umount_blockers(m->path); } _exit(r < 0 ? EXIT_FAILURE : EXIT_SUCCESS); } r = wait_for_terminate_with_timeout(pid, DEFAULT_TIMEOUT_USEC); if (r == -ETIMEDOUT) { log_error_errno(r, "Unmounting '%s' timed out, issuing SIGKILL to PID " PID_FMT ".", m->path, pid); (void) kill(pid, SIGKILL); } else if (r == -EPROTO) log_debug_errno(r, "Unmounting '%s' failed abnormally, child process " PID_FMT " aborted or exited non-zero.", m->path, pid); else if (r < 0) log_error_errno(r, "Unmounting '%s' failed unexpectedly, couldn't wait for child process " PID_FMT ": %m", m->path, pid); return r; } /* This includes remounting readonly, which changes the kernel mount options. Therefore the list passed to * this function is invalidated, and should not be reused. */ static int mount_points_list_umount(MountPoint **head, bool *changed, bool last_try) { int n_failed = 0; assert(head); assert(changed); LIST_FOREACH(mount_point, m, *head) { if (m->try_remount_ro) { /* We always try to remount directories read-only first, before we go on and umount * them. * * Mount points can be stacked. If a mount point is stacked below / or /usr, we * cannot umount or remount it directly, since there is no way to refer to the * underlying mount. There's nothing we can do about it for the general case, but we * can do something about it if it is aliased somewhere else via a bind mount. If we * explicitly remount the super block of that alias read-only we hence should be * relatively safe regarding keeping a dirty fs we cannot otherwise see. * * Since the remount can hang in the instance of remote filesystems, we remount * asynchronously and skip the subsequent umount if it fails. */ if (remount_with_timeout(m, last_try) < 0) { /* Remount failed, but try unmounting anyway, * unless this is a mount point we want to skip. */ if (nonunmountable_path(m->path)) { n_failed++; continue; } } } /* Skip / and /usr since we cannot unmount that anyway, since we are running from it. They * have already been remounted ro. */ if (nonunmountable_path(m->path)) continue; /* Trying to umount */ if (umount_with_timeout(m, last_try) < 0) n_failed++; else *changed = true; } return n_failed; } static int swap_points_list_off(MountPoint **head, bool *changed) { int n_failed = 0; assert(head); assert(changed); LIST_FOREACH(mount_point, m, *head) { log_info("Deactivating swap %s.", m->path); if (swapoff(m->path) < 0) { log_warning_errno(errno, "Could not deactivate swap %s: %m", m->path); n_failed++; continue; } *changed = true; mount_point_free(head, m); } return n_failed; } static int loopback_points_list_detach(MountPoint **head, bool *changed, bool last_try) { int n_failed = 0, r; dev_t rootdev = 0; assert(head); assert(changed); (void) get_block_device("/", &rootdev); LIST_FOREACH(mount_point, m, *head) { if (major(rootdev) != 0 && rootdev == m->devnum) { n_failed++; continue; } log_info("Detaching loopback %s.", m->path); r = delete_loopback(m->path); if (r < 0) { log_full_errno(last_try ? LOG_ERR : LOG_INFO, r, "Could not detach loopback %s: %m", m->path); n_failed++; continue; } if (r > 0) *changed = true; mount_point_free(head, m); } return n_failed; } static int dm_points_list_detach(MountPoint **head, bool *changed, bool last_try) { int n_failed = 0, r; dev_t rootdev = 0; assert(head); assert(changed); (void) get_block_device("/", &rootdev); LIST_FOREACH(mount_point, m, *head) { if (major(rootdev) != 0 && rootdev == m->devnum) { n_failed ++; continue; } log_info("Detaching DM %s (%u:%u).", m->path, major(m->devnum), minor(m->devnum)); r = delete_dm(m); if (r < 0) { log_full_errno(last_try ? LOG_ERR : LOG_INFO, r, "Could not detach DM %s: %m", m->path); n_failed++; continue; } *changed = true; mount_point_free(head, m); } return n_failed; } static int md_points_list_detach(MountPoint **head, bool *changed, bool last_try) { int n_failed = 0, r; dev_t rootdev = 0; assert(head); assert(changed); (void) get_block_device("/", &rootdev); LIST_FOREACH(mount_point, m, *head) { if (major(rootdev) != 0 && rootdev == m->devnum) { n_failed ++; continue; } log_info("Stopping MD %s (%u:%u).", m->path, major(m->devnum), minor(m->devnum)); r = delete_md(m); if (r < 0) { log_full_errno(last_try ? LOG_ERR : LOG_INFO, r, "Could not stop MD %s: %m", m->path); n_failed++; continue; } *changed = true; mount_point_free(head, m); } return n_failed; } static int umount_all_once(bool *changed, bool last_try) { _cleanup_(mount_points_list_free) LIST_HEAD(MountPoint, mp_list_head); int r; assert(changed); LIST_HEAD_INIT(mp_list_head); r = mount_points_list_get(NULL, &mp_list_head); if (r < 0) return r; return mount_points_list_umount(&mp_list_head, changed, last_try); } int umount_all(bool *changed, bool last_try) { bool umount_changed; int r; assert(changed); /* Retry umount, until nothing can be umounted anymore. Mounts are processed in order, newest * first. The retries are needed when an old mount has been moved, to a path inside a newer mount. */ do { umount_changed = false; r = umount_all_once(&umount_changed, last_try); if (umount_changed) *changed = true; } while (umount_changed); return r; } int swapoff_all(bool *changed) { _cleanup_(mount_points_list_free) LIST_HEAD(MountPoint, swap_list_head); int r; assert(changed); LIST_HEAD_INIT(swap_list_head); r = swap_list_get(NULL, &swap_list_head); if (r < 0) return r; return swap_points_list_off(&swap_list_head, changed); } int loopback_detach_all(bool *changed, bool last_try) { _cleanup_(mount_points_list_free) LIST_HEAD(MountPoint, loopback_list_head); int r; assert(changed); LIST_HEAD_INIT(loopback_list_head); r = loopback_list_get(&loopback_list_head); if (r < 0) return r; return loopback_points_list_detach(&loopback_list_head, changed, last_try); } int dm_detach_all(bool *changed, bool last_try) { _cleanup_(mount_points_list_free) LIST_HEAD(MountPoint, dm_list_head); int r; assert(changed); LIST_HEAD_INIT(dm_list_head); r = dm_list_get(&dm_list_head); if (r < 0) return r; return dm_points_list_detach(&dm_list_head, changed, last_try); } int md_detach_all(bool *changed, bool last_try) { _cleanup_(mount_points_list_free) LIST_HEAD(MountPoint, md_list_head); int r; assert(changed); LIST_HEAD_INIT(md_list_head); r = md_list_get(&md_list_head); if (r < 0) return r; return md_points_list_detach(&md_list_head, changed, last_try); }