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-rw-r--r--src/shutdown/umount.c932
1 files changed, 932 insertions, 0 deletions
diff --git a/src/shutdown/umount.c b/src/shutdown/umount.c
new file mode 100644
index 0000000..e650b82
--- /dev/null
+++ b/src/shutdown/umount.c
@@ -0,0 +1,932 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/***
+ Copyright © 2010 ProFUSION embedded systems
+***/
+
+#include <errno.h>
+#include <fcntl.h>
+#include <linux/dm-ioctl.h>
+#include <linux/major.h>
+#include <linux/raid/md_u.h>
+#include <linux/loop.h>
+#include <sys/mount.h>
+#include <sys/swap.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#if HAVE_VALGRIND_MEMCHECK_H
+#include <valgrind/memcheck.h>
+#endif
+
+#include "sd-device.h"
+
+#include "alloc-util.h"
+#include "blockdev-util.h"
+#include "def.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 "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 (;;) {
+ _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);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-23 04:06:17 +0000