From 2cb7e0aaedad73b076ea18c6900b0e86c5760d79 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sat, 27 Apr 2024 15:00:47 +0200 Subject: Adding upstream version 247.3. Signed-off-by: Daniel Baumann --- src/shutdown/umount.c | 843 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 843 insertions(+) create mode 100644 src/shutdown/umount.c (limited to 'src/shutdown/umount.c') diff --git a/src/shutdown/umount.c b/src/shutdown/umount.c new file mode 100644 index 0000000..3a72a13 --- /dev/null +++ b/src/shutdown/umount.c @@ -0,0 +1,843 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ +/*** + Copyright © 2010 ProFUSION embedded systems +***/ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "sd-device.h" + +#include "alloc-util.h" +#include "blockdev-util.h" +#include "def.h" +#include "device-util.h" +#include "escape.h" +#include "fd-util.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 "path-util.h" +#include "process-util.h" +#include "signal-util.h" +#include "string-util.h" +#include "strv.h" +#include "umount.h" +#include "util.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 (;;) { + struct libmnt_fs *fs; + const char *path, *fstype; + _cleanup_free_ char *options = NULL; + unsigned long remount_flags = 0u; + _cleanup_free_ char *remount_options = NULL; + bool try_remount_ro; + _cleanup_free_ MountPoint *m = NULL; + + r = mnt_table_next_fs(table, iter, &fs); + if (r == 1) + 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), + NULL)) + return log_oom(); + if (!strextend_with_separator(&options, ",", + mnt_fs_get_fs_options(fs), + NULL)) + 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; + + /* 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) && + !fstype_is_api_vfs(fstype) && + !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 = new0(MountPoint, 1); + if (!m) + return log_oom(); + + m->path = strdup(path); + if (!m->path) + return log_oom(); + + m->remount_options = TAKE_PTR(remount_options); + m->remount_flags = remount_flags; + m->try_remount_ro = try_remount_ro; + + 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) + 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; + + 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 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 (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; + } + + /* 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); + + if (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, + }) < 0) + return -errno; + + return 0; +} + +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); + + if (ioctl(fd, STOP_ARRAY, NULL) < 0) + return -errno; + + return 0; +} + +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 int remount_with_timeout(MountPoint *m, int umount_log_level) { + 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 in with options '%s'.", m->path, 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(umount_log_level, 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, int umount_log_level) { + 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 + * then return EBUSY).*/ + r = umount2(m->path, MNT_FORCE); + if (r < 0) + log_full_errno(umount_log_level, errno, "Failed to unmount %s: %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, "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, int umount_log_level) { + MountPoint *m; + 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, umount_log_level) < 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, umount_log_level) < 0) + n_failed++; + else + *changed = true; + } + + return n_failed; +} + +static int swap_points_list_off(MountPoint **head, bool *changed) { + MountPoint *m, *n; + int n_failed = 0; + + assert(head); + assert(changed); + + LIST_FOREACH_SAFE(mount_point, m, n, *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, int umount_log_level) { + MountPoint *m, *n; + int n_failed = 0, r; + dev_t rootdev = 0; + + assert(head); + assert(changed); + + (void) get_block_device("/", &rootdev); + + LIST_FOREACH_SAFE(mount_point, m, n, *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(umount_log_level, 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, int umount_log_level) { + MountPoint *m, *n; + int n_failed = 0, r; + dev_t rootdev = 0; + + assert(head); + assert(changed); + + (void) get_block_device("/", &rootdev); + + LIST_FOREACH_SAFE(mount_point, m, n, *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(umount_log_level, 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, int umount_log_level) { + MountPoint *m, *n; + int n_failed = 0, r; + dev_t rootdev = 0; + + assert(head); + assert(changed); + + (void) get_block_device("/", &rootdev); + + LIST_FOREACH_SAFE(mount_point, m, n, *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(umount_log_level, 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, int umount_log_level) { + _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, umount_log_level); +} + +int umount_all(bool *changed, int umount_log_level) { + 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, umount_log_level); + 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, int umount_log_level) { + _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, umount_log_level); +} + +int dm_detach_all(bool *changed, int umount_log_level) { + _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, umount_log_level); +} + +int md_detach_all(bool *changed, int umount_log_level) { + _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, umount_log_level); +} -- cgit v1.2.3