adb7b782f8
Use libmount more
689 lines
23 KiB
C
689 lines
23 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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/***
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Copyright © 2010 ProFUSION embedded systems
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***/
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#include <errno.h>
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#include <fcntl.h>
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#include <linux/dm-ioctl.h>
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#include <linux/loop.h>
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#include <string.h>
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#include <sys/mount.h>
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#include <sys/swap.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include "sd-device.h"
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#include "alloc-util.h"
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#include "blockdev-util.h"
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#include "def.h"
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#include "device-util.h"
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#include "escape.h"
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#include "fd-util.h"
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#include "fstab-util.h"
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#include "libmount-util.h"
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#include "mount-setup.h"
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#include "mount-util.h"
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#include "mountpoint-util.h"
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#include "path-util.h"
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#include "process-util.h"
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#include "signal-util.h"
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#include "string-util.h"
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#include "strv.h"
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#include "umount.h"
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#include "util.h"
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#include "virt.h"
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static void mount_point_free(MountPoint **head, MountPoint *m) {
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assert(head);
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assert(m);
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LIST_REMOVE(mount_point, *head, m);
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free(m->path);
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free(m->remount_options);
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free(m);
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}
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void mount_points_list_free(MountPoint **head) {
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assert(head);
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while (*head)
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mount_point_free(head, *head);
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}
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int mount_points_list_get(const char *mountinfo, MountPoint **head) {
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_cleanup_(mnt_free_tablep) struct libmnt_table *table = NULL;
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_cleanup_(mnt_free_iterp) struct libmnt_iter *iter = NULL;
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int r;
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assert(head);
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r = libmount_parse(mountinfo, NULL, &table, &iter);
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if (r < 0)
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return log_error_errno(r, "Failed to parse %s: %m", mountinfo);
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for (;;) {
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struct libmnt_fs *fs;
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const char *path, *fstype;
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_cleanup_free_ char *options = NULL;
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unsigned long remount_flags = 0u;
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_cleanup_free_ char *remount_options = NULL;
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bool try_remount_ro;
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_cleanup_free_ MountPoint *m = NULL;
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r = mnt_table_next_fs(table, iter, &fs);
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if (r == 1)
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break;
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if (r < 0)
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return log_error_errno(r, "Failed to get next entry from %s: %m", mountinfo);
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path = mnt_fs_get_target(fs);
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if (!path)
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continue;
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fstype = mnt_fs_get_fstype(fs);
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/* Combine the generic VFS options with the FS-specific
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* options. Duplicates are not a problem here, because the only
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* options that should come up twice are typically ro/rw, which
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* are turned into MS_RDONLY or the inversion of it.
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*
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* Even if there are duplicates later in mount_option_mangle()
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* they shouldn't hurt anyways as they override each other.
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*/
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if (!strextend_with_separator(&options, ",",
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mnt_fs_get_vfs_options(fs),
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NULL))
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return log_oom();
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if (!strextend_with_separator(&options, ",",
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mnt_fs_get_fs_options(fs),
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NULL))
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return log_oom();
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/* Ignore mount points we can't unmount because they
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* are API or because we are keeping them open (like
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* /dev/console). Also, ignore all mounts below API
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* file systems, since they are likely virtual too,
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* and hence not worth spending time on. Also, in
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* unprivileged containers we might lack the rights to
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* unmount these things, hence don't bother. */
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if (mount_point_is_api(path) ||
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mount_point_ignore(path) ||
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PATH_STARTSWITH_SET(path, "/dev", "/sys", "/proc"))
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continue;
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/* If we are in a container, don't attempt to
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* read-only mount anything as that brings no real
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* benefits, but might confuse the host, as we remount
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* the superblock here, not the bind mount.
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*
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* If the filesystem is a network fs, also skip the
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* remount. It brings no value (we cannot leave
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* a "dirty fs") and could hang if the network is down.
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* Note that umount2() is more careful and will not
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* hang because of the network being down. */
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try_remount_ro = detect_container() <= 0 &&
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!fstype_is_network(fstype) &&
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!fstype_is_api_vfs(fstype) &&
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!fstype_is_ro(fstype) &&
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!fstab_test_yes_no_option(options, "ro\0rw\0");
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if (try_remount_ro) {
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/* mount(2) states that mount flags and options need to be exactly the same
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* as they were when the filesystem was mounted, except for the desired
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* changes. So we reconstruct both here and adjust them for the later
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* remount call too. */
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r = mnt_fs_get_propagation(fs, &remount_flags);
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if (r < 0) {
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log_warning_errno(r, "mnt_fs_get_propagation() failed for %s, ignoring: %m", path);
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continue;
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}
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r = mount_option_mangle(options, remount_flags, &remount_flags, &remount_options);
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if (r < 0) {
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log_warning_errno(r, "mount_option_mangle failed for %s, ignoring: %m", path);
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continue;
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}
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/* MS_BIND is special. If it is provided it will only make the mount-point
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* read-only. If left out, the super block itself is remounted, which we want. */
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remount_flags = (remount_flags|MS_REMOUNT|MS_RDONLY) & ~MS_BIND;
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}
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m = new0(MountPoint, 1);
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if (!m)
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return log_oom();
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m->path = strdup(path);
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if (!m->path)
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return log_oom();
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m->remount_options = TAKE_PTR(remount_options);
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m->remount_flags = remount_flags;
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m->try_remount_ro = try_remount_ro;
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LIST_PREPEND(mount_point, *head, TAKE_PTR(m));
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}
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return 0;
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}
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int swap_list_get(const char *swaps, MountPoint **head) {
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_cleanup_(mnt_free_tablep) struct libmnt_table *t = NULL;
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_cleanup_(mnt_free_iterp) struct libmnt_iter *i = NULL;
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int r;
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assert(head);
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t = mnt_new_table();
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i = mnt_new_iter(MNT_ITER_FORWARD);
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if (!t || !i)
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return log_oom();
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r = mnt_table_parse_swaps(t, swaps);
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if (r < 0)
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return log_error_errno(r, "Failed to parse %s: %m", swaps);
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for (;;) {
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struct libmnt_fs *fs;
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_cleanup_free_ MountPoint *swap = NULL;
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const char *source;
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r = mnt_table_next_fs(t, i, &fs);
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if (r == 1)
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break;
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if (r < 0)
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return log_error_errno(r, "Failed to get next entry from %s: %m", swaps);
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source = mnt_fs_get_source(fs);
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if (!source)
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continue;
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swap = new0(MountPoint, 1);
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if (!swap)
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return -ENOMEM;
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swap->path = strdup(source);
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if (!swap->path)
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return -ENOMEM;
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LIST_PREPEND(mount_point, *head, TAKE_PTR(swap));
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}
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return 0;
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}
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static int loopback_list_get(MountPoint **head) {
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_cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL;
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sd_device *d;
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int r;
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assert(head);
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r = sd_device_enumerator_new(&e);
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if (r < 0)
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return r;
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r = sd_device_enumerator_allow_uninitialized(e);
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if (r < 0)
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return r;
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r = sd_device_enumerator_add_match_subsystem(e, "block", true);
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if (r < 0)
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return r;
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r = sd_device_enumerator_add_match_sysname(e, "loop*");
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if (r < 0)
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return r;
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r = sd_device_enumerator_add_match_sysattr(e, "loop/backing_file", NULL, true);
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if (r < 0)
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return r;
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FOREACH_DEVICE(e, d) {
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_cleanup_free_ char *p = NULL;
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const char *dn;
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MountPoint *lb;
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if (sd_device_get_devname(d, &dn) < 0)
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continue;
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p = strdup(dn);
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if (!p)
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return -ENOMEM;
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lb = new(MountPoint, 1);
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if (!lb)
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return -ENOMEM;
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*lb = (MountPoint) {
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.path = TAKE_PTR(p),
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};
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LIST_PREPEND(mount_point, *head, lb);
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}
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return 0;
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}
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static int dm_list_get(MountPoint **head) {
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_cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL;
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sd_device *d;
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int r;
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assert(head);
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r = sd_device_enumerator_new(&e);
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if (r < 0)
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return r;
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r = sd_device_enumerator_allow_uninitialized(e);
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if (r < 0)
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return r;
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r = sd_device_enumerator_add_match_subsystem(e, "block", true);
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if (r < 0)
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return r;
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r = sd_device_enumerator_add_match_sysname(e, "dm-*");
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if (r < 0)
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return r;
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FOREACH_DEVICE(e, d) {
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_cleanup_free_ char *p = NULL;
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const char *dn;
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MountPoint *m;
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dev_t devnum;
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if (sd_device_get_devnum(d, &devnum) < 0 ||
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sd_device_get_devname(d, &dn) < 0)
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continue;
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p = strdup(dn);
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if (!p)
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return -ENOMEM;
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m = new(MountPoint, 1);
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if (!m)
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return -ENOMEM;
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*m = (MountPoint) {
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.path = TAKE_PTR(p),
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.devnum = devnum,
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};
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LIST_PREPEND(mount_point, *head, m);
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}
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return 0;
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}
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static int delete_loopback(const char *device) {
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_cleanup_close_ int fd = -1;
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int r;
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assert(device);
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fd = open(device, O_RDONLY|O_CLOEXEC);
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if (fd < 0)
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return errno == ENOENT ? 0 : -errno;
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r = ioctl(fd, LOOP_CLR_FD, 0);
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if (r >= 0)
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return 1;
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/* ENXIO: not bound, so no error */
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if (errno == ENXIO)
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return 0;
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return -errno;
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}
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static int delete_dm(dev_t devnum) {
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struct dm_ioctl dm = {
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.version = {
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DM_VERSION_MAJOR,
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DM_VERSION_MINOR,
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DM_VERSION_PATCHLEVEL
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},
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.data_size = sizeof(dm),
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.dev = devnum,
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};
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_cleanup_close_ int fd = -1;
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assert(major(devnum) != 0);
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fd = open("/dev/mapper/control", O_RDWR|O_CLOEXEC);
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if (fd < 0)
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return -errno;
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if (ioctl(fd, DM_DEV_REMOVE, &dm) < 0)
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return -errno;
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return 0;
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}
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static bool nonunmountable_path(const char *path) {
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return path_equal(path, "/")
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#if ! HAVE_SPLIT_USR
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|| path_equal(path, "/usr")
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#endif
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|| path_startswith(path, "/run/initramfs");
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}
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static int remount_with_timeout(MountPoint *m, int umount_log_level) {
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pid_t pid;
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int r;
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BLOCK_SIGNALS(SIGCHLD);
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assert(m);
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/* Due to the possibility of a remount operation hanging, we
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* fork a child process and set a timeout. If the timeout
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* lapses, the assumption is that that particular remount
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* failed. */
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r = safe_fork("(sd-remount)", FORK_RESET_SIGNALS|FORK_CLOSE_ALL_FDS|FORK_LOG|FORK_REOPEN_LOG, &pid);
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if (r < 0)
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return r;
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if (r == 0) {
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log_info("Remounting '%s' read-only in with options '%s'.", m->path, m->remount_options);
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/* Start the mount operation here in the child */
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r = mount(NULL, m->path, NULL, m->remount_flags, m->remount_options);
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if (r < 0)
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log_full_errno(umount_log_level, errno, "Failed to remount '%s' read-only: %m", m->path);
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_exit(r < 0 ? EXIT_FAILURE : EXIT_SUCCESS);
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}
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r = wait_for_terminate_with_timeout(pid, DEFAULT_TIMEOUT_USEC);
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if (r == -ETIMEDOUT) {
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log_error_errno(r, "Remounting '%s' timed out, issuing SIGKILL to PID " PID_FMT ".", m->path, pid);
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(void) kill(pid, SIGKILL);
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} else if (r == -EPROTO)
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log_debug_errno(r, "Remounting '%s' failed abnormally, child process " PID_FMT " aborted or exited non-zero.", m->path, pid);
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else if (r < 0)
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log_error_errno(r, "Remounting '%s' failed unexpectedly, couldn't wait for child process " PID_FMT ": %m", m->path, pid);
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return r;
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}
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static int umount_with_timeout(MountPoint *m, int umount_log_level) {
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pid_t pid;
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int r;
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BLOCK_SIGNALS(SIGCHLD);
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assert(m);
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/* Due to the possibility of a umount operation hanging, we
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* fork a child process and set a timeout. If the timeout
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* lapses, the assumption is that that particular umount
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* failed. */
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r = safe_fork("(sd-umount)", FORK_RESET_SIGNALS|FORK_CLOSE_ALL_FDS|FORK_LOG|FORK_REOPEN_LOG, &pid);
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if (r < 0)
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return r;
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if (r == 0) {
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log_info("Unmounting '%s'.", m->path);
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/* Start the mount operation here in the child Using MNT_FORCE
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* causes some filesystems (e.g. FUSE and NFS and other network
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* filesystems) to abort any pending requests and return -EIO
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* rather than blocking indefinitely. If the filesysten is
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* "busy", this may allow processes to die, thus making the
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* filesystem less busy so the unmount might succeed (rather
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* then return EBUSY).*/
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r = umount2(m->path, MNT_FORCE);
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if (r < 0)
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log_full_errno(umount_log_level, errno, "Failed to unmount %s: %m", m->path);
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_exit(r < 0 ? EXIT_FAILURE : EXIT_SUCCESS);
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}
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r = wait_for_terminate_with_timeout(pid, DEFAULT_TIMEOUT_USEC);
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if (r == -ETIMEDOUT) {
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log_error_errno(r, "Unmounting '%s' timed out, issuing SIGKILL to PID " PID_FMT ".", m->path, pid);
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(void) kill(pid, SIGKILL);
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} else if (r == -EPROTO)
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log_debug_errno(r, "Unmounting '%s' failed abnormally, child process " PID_FMT " aborted or exited non-zero.", m->path, pid);
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else if (r < 0)
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log_error_errno(r, "Unmounting '%s' failed unexpectedly, couldn't wait for child process " PID_FMT ": %m", m->path, pid);
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return r;
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}
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/* This includes remounting readonly, which changes the kernel mount options.
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* Therefore the list passed to this function is invalidated, and should not be reused. */
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static int mount_points_list_umount(MountPoint **head, bool *changed, int umount_log_level) {
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MountPoint *m;
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int n_failed = 0;
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assert(head);
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assert(changed);
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LIST_FOREACH(mount_point, m, *head) {
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if (m->try_remount_ro) {
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/* We always try to remount directories
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* read-only first, before we go on and umount
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* them.
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*
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* Mount points can be stacked. If a mount
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* point is stacked below / or /usr, we
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* cannot umount or remount it directly,
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* since there is no way to refer to the
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* underlying mount. There's nothing we can do
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* about it for the general case, but we can
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* do something about it if it is aliased
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* somewhere else via a bind mount. If we
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* explicitly remount the super block of that
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* alias read-only we hence should be
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* relatively safe regarding keeping a dirty fs
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* we cannot otherwise see.
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*
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* Since the remount can hang in the instance of
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* remote filesystems, we remount asynchronously
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* and skip the subsequent umount if it fails. */
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if (remount_with_timeout(m, umount_log_level) < 0) {
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/* Remount failed, but try unmounting anyway,
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* unless this is a mount point we want to skip. */
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if (nonunmountable_path(m->path)) {
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n_failed++;
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continue;
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}
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}
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}
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/* Skip / and /usr since we cannot unmount that
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* anyway, since we are running from it. They have
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* already been remounted ro. */
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if (nonunmountable_path(m->path))
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continue;
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/* Trying to umount */
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if (umount_with_timeout(m, umount_log_level) < 0)
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n_failed++;
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else
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*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) {
|
|
*changed = true;
|
|
mount_point_free(head, m);
|
|
} else {
|
|
log_warning_errno(errno, "Could not deactivate swap %s: %m", m->path);
|
|
n_failed++;
|
|
}
|
|
}
|
|
|
|
return n_failed;
|
|
}
|
|
|
|
static int loopback_points_list_detach(MountPoint **head, bool *changed, int umount_log_level) {
|
|
MountPoint *m, *n;
|
|
int n_failed = 0, k;
|
|
struct stat root_st;
|
|
|
|
assert(head);
|
|
assert(changed);
|
|
|
|
k = lstat("/", &root_st);
|
|
|
|
LIST_FOREACH_SAFE(mount_point, m, n, *head) {
|
|
int r;
|
|
struct stat loopback_st;
|
|
|
|
if (k >= 0 &&
|
|
major(root_st.st_dev) != 0 &&
|
|
lstat(m->path, &loopback_st) >= 0 &&
|
|
root_st.st_dev == loopback_st.st_rdev) {
|
|
n_failed++;
|
|
continue;
|
|
}
|
|
|
|
log_info("Detaching loopback %s.", m->path);
|
|
r = delete_loopback(m->path);
|
|
if (r >= 0) {
|
|
if (r > 0)
|
|
*changed = true;
|
|
|
|
mount_point_free(head, m);
|
|
} else {
|
|
log_full_errno(umount_log_level, errno, "Could not detach loopback %s: %m", m->path);
|
|
n_failed++;
|
|
}
|
|
}
|
|
|
|
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;
|
|
|
|
assert(head);
|
|
assert(changed);
|
|
|
|
r = get_block_device("/", &rootdev);
|
|
if (r <= 0)
|
|
rootdev = 0;
|
|
|
|
LIST_FOREACH_SAFE(mount_point, m, n, *head) {
|
|
|
|
if (major(rootdev) != 0 && rootdev == m->devnum) {
|
|
n_failed ++;
|
|
continue;
|
|
}
|
|
|
|
log_info("Detaching DM %u:%u.", major(m->devnum), minor(m->devnum));
|
|
r = delete_dm(m->devnum);
|
|
if (r >= 0) {
|
|
*changed = true;
|
|
mount_point_free(head, m);
|
|
} else {
|
|
log_full_errno(umount_log_level, errno, "Could not detach DM %s: %m", m->path);
|
|
n_failed++;
|
|
}
|
|
}
|
|
|
|
return n_failed;
|
|
}
|
|
|
|
static int umount_all_once(bool *changed, int umount_log_level) {
|
|
int r;
|
|
_cleanup_(mount_points_list_free) LIST_HEAD(MountPoint, mp_list_head);
|
|
|
|
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);
|
|
}
|