1 /* SPDX-License-Identifier: LGPL-2.1+ */
3 This file is part of systemd.
5 Copyright 2015 Lennart Poettering
13 #include <sys/statfs.h>
16 //#include "btrfs-util.h"
17 #include "cgroup-util.h"
18 #include "dirent-util.h"
22 #include "mount-util.h"
23 #include "path-util.h"
25 #include "stat-util.h"
26 #include "string-util.h"
28 static bool is_physical_fs(const struct statfs *sfs) {
29 return !is_temporary_fs(sfs) && !is_cgroup_fs(sfs);
32 int rm_rf_children(int fd, RemoveFlags flags, struct stat *root_dev) {
33 _cleanup_closedir_ DIR *d = NULL;
40 /* This returns the first error we run into, but nevertheless
41 * tries to go on. This closes the passed fd. */
43 if (!(flags & REMOVE_PHYSICAL)) {
45 r = fstatfs(fd, &sfs);
51 if (is_physical_fs(&sfs)) {
52 /* We refuse to clean physical file systems
53 * with this call, unless explicitly
54 * requested. This is extra paranoia just to
55 * be sure we never ever remove non-state
58 log_error("Attempted to remove disk file system, and we can't allow that.");
67 return errno == ENOENT ? 0 : -errno;
70 FOREACH_DIRENT_ALL(de, d, return -errno) {
74 if (dot_or_dot_dot(de->d_name))
77 if (de->d_type == DT_UNKNOWN ||
78 (de->d_type == DT_DIR && (root_dev || (flags & REMOVE_SUBVOLUME)))) {
79 if (fstatat(fd, de->d_name, &st, AT_SYMLINK_NOFOLLOW) < 0) {
80 if (ret == 0 && errno != ENOENT)
85 is_dir = S_ISDIR(st.st_mode);
87 is_dir = de->d_type == DT_DIR;
92 /* if root_dev is set, remove subdirectories only if device is same */
93 if (root_dev && st.st_dev != root_dev->st_dev)
96 subdir_fd = openat(fd, de->d_name, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|O_NOFOLLOW|O_NOATIME);
98 if (ret == 0 && errno != ENOENT)
103 /* Stop at mount points */
104 r = fd_is_mount_point(fd, de->d_name, 0);
106 if (ret == 0 && r != -ENOENT)
109 safe_close(subdir_fd);
113 safe_close(subdir_fd);
117 #if 0 /// elogind does not support BTRFS this directly
118 if ((flags & REMOVE_SUBVOLUME) && st.st_ino == 256) {
120 /* This could be a subvolume, try to remove it */
122 r = btrfs_subvol_remove_fd(fd, de->d_name, BTRFS_REMOVE_RECURSIVE|BTRFS_REMOVE_QUOTA);
124 if (!IN_SET(r, -ENOTTY, -EINVAL)) {
128 safe_close(subdir_fd);
132 /* ENOTTY, then it wasn't a
133 * btrfs subvolume, continue
136 /* It was a subvolume, continue. */
137 safe_close(subdir_fd);
143 /* We pass REMOVE_PHYSICAL here, to avoid
144 * doing the fstatfs() to check the file
145 * system type again for each directory */
146 r = rm_rf_children(subdir_fd, flags | REMOVE_PHYSICAL, root_dev);
147 if (r < 0 && ret == 0)
150 if (unlinkat(fd, de->d_name, AT_REMOVEDIR) < 0) {
151 if (ret == 0 && errno != ENOENT)
155 } else if (!(flags & REMOVE_ONLY_DIRECTORIES)) {
157 if (unlinkat(fd, de->d_name, 0) < 0) {
158 if (ret == 0 && errno != ENOENT)
166 int rm_rf(const char *path, RemoveFlags flags) {
172 /* We refuse to clean the root file system with this
173 * call. This is extra paranoia to never cause a really
174 * seriously broken system. */
175 if (path_equal_or_files_same(path, "/", AT_SYMLINK_NOFOLLOW)) {
176 log_error("Attempted to remove entire root file system, and we can't allow that.");
180 #if 0 /// elogind does not support BTRFS this directly
181 if ((flags & (REMOVE_SUBVOLUME|REMOVE_ROOT|REMOVE_PHYSICAL)) == (REMOVE_SUBVOLUME|REMOVE_ROOT|REMOVE_PHYSICAL)) {
182 /* Try to remove as subvolume first */
183 r = btrfs_subvol_remove(path, BTRFS_REMOVE_RECURSIVE|BTRFS_REMOVE_QUOTA);
187 if (!IN_SET(r, -ENOTTY, -EINVAL, -ENOTDIR))
190 /* Not btrfs or not a subvolume */
194 fd = open(path, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|O_NOFOLLOW|O_NOATIME);
197 if (!IN_SET(errno, ENOTDIR, ELOOP))
200 if (!(flags & REMOVE_PHYSICAL)) {
201 if (statfs(path, &s) < 0)
204 if (is_physical_fs(&s)) {
205 log_error("Attempted to remove disk file system, and we can't allow that.");
210 if ((flags & REMOVE_ROOT) && !(flags & REMOVE_ONLY_DIRECTORIES))
211 if (unlink(path) < 0 && errno != ENOENT)
217 r = rm_rf_children(fd, flags, NULL);
219 if (flags & REMOVE_ROOT) {
220 if (rmdir(path) < 0) {
221 if (r == 0 && errno != ENOENT)