2 This file is part of systemd.
4 Copyright 2015 Lennart Poettering
6 systemd is free software; you can redistribute it and/or modify it
7 under the terms of the GNU Lesser General Public License as published by
8 the Free Software Foundation; either version 2.1 of the License, or
9 (at your option) any later version.
11 systemd is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public License
17 along with systemd; If not, see <http://www.gnu.org/licenses/>.
25 #include <sys/statfs.h>
28 //#include "btrfs-util.h"
29 #include "cgroup-util.h"
33 #include "mount-util.h"
34 #include "path-util.h"
36 #include "stat-util.h"
37 #include "string-util.h"
39 static bool is_physical_fs(const struct statfs *sfs) {
40 return !is_temporary_fs(sfs) && !is_cgroup_fs(sfs);
43 int rm_rf_children(int fd, RemoveFlags flags, struct stat *root_dev) {
44 _cleanup_closedir_ DIR *d = NULL;
51 /* This returns the first error we run into, but nevertheless
52 * tries to go on. This closes the passed fd. */
54 if (!(flags & REMOVE_PHYSICAL)) {
56 r = fstatfs(fd, &sfs);
62 if (is_physical_fs(&sfs)) {
63 /* We refuse to clean physical file systems
64 * with this call, unless explicitly
65 * requested. This is extra paranoia just to
66 * be sure we never ever remove non-state
69 log_error("Attempted to remove disk file system, and we can't allow that.");
78 return errno == ENOENT ? 0 : -errno;
81 FOREACH_DIRENT_ALL(de, d, return -errno) {
85 if (dot_or_dot_dot(de->d_name))
88 if (de->d_type == DT_UNKNOWN ||
89 (de->d_type == DT_DIR && (root_dev || (flags & REMOVE_SUBVOLUME)))) {
90 if (fstatat(fd, de->d_name, &st, AT_SYMLINK_NOFOLLOW) < 0) {
91 if (ret == 0 && errno != ENOENT)
96 is_dir = S_ISDIR(st.st_mode);
98 is_dir = de->d_type == DT_DIR;
103 /* if root_dev is set, remove subdirectories only if device is same */
104 if (root_dev && st.st_dev != root_dev->st_dev)
107 subdir_fd = openat(fd, de->d_name, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|O_NOFOLLOW|O_NOATIME);
109 if (ret == 0 && errno != ENOENT)
114 /* Stop at mount points */
115 r = fd_is_mount_point(fd, de->d_name, 0);
117 if (ret == 0 && r != -ENOENT)
120 safe_close(subdir_fd);
124 safe_close(subdir_fd);
128 #if 0 /// elogind does not support BTRFS this directly
129 if ((flags & REMOVE_SUBVOLUME) && st.st_ino == 256) {
131 /* This could be a subvolume, try to remove it */
133 r = btrfs_subvol_remove_fd(fd, de->d_name, BTRFS_REMOVE_RECURSIVE|BTRFS_REMOVE_QUOTA);
135 if (r != -ENOTTY && r != -EINVAL) {
139 safe_close(subdir_fd);
143 /* ENOTTY, then it wasn't a
144 * btrfs subvolume, continue
147 /* It was a subvolume, continue. */
148 safe_close(subdir_fd);
154 /* We pass REMOVE_PHYSICAL here, to avoid
155 * doing the fstatfs() to check the file
156 * system type again for each directory */
157 r = rm_rf_children(subdir_fd, flags | REMOVE_PHYSICAL, root_dev);
158 if (r < 0 && ret == 0)
161 if (unlinkat(fd, de->d_name, AT_REMOVEDIR) < 0) {
162 if (ret == 0 && errno != ENOENT)
166 } else if (!(flags & REMOVE_ONLY_DIRECTORIES)) {
168 if (unlinkat(fd, de->d_name, 0) < 0) {
169 if (ret == 0 && errno != ENOENT)
177 int rm_rf(const char *path, RemoveFlags flags) {
183 /* We refuse to clean the root file system with this
184 * call. This is extra paranoia to never cause a really
185 * seriously broken system. */
186 if (path_equal(path, "/")) {
187 log_error("Attempted to remove entire root file system, and we can't allow that.");
191 #if 0 /// elogind does not support BTRFS this directly
192 if ((flags & (REMOVE_SUBVOLUME|REMOVE_ROOT|REMOVE_PHYSICAL)) == (REMOVE_SUBVOLUME|REMOVE_ROOT|REMOVE_PHYSICAL)) {
193 /* Try to remove as subvolume first */
194 r = btrfs_subvol_remove(path, BTRFS_REMOVE_RECURSIVE|BTRFS_REMOVE_QUOTA);
198 if (r != -ENOTTY && r != -EINVAL && r != -ENOTDIR)
201 /* Not btrfs or not a subvolume */
205 fd = open(path, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|O_NOFOLLOW|O_NOATIME);
208 if (errno != ENOTDIR && errno != ELOOP)
211 if (!(flags & REMOVE_PHYSICAL)) {
212 if (statfs(path, &s) < 0)
215 if (is_physical_fs(&s)) {
216 log_error("Attempted to remove disk file system, and we can't allow that.");
221 if ((flags & REMOVE_ROOT) && !(flags & REMOVE_ONLY_DIRECTORIES))
222 if (unlink(path) < 0 && errno != ENOENT)
228 r = rm_rf_children(fd, flags, NULL);
230 if (flags & REMOVE_ROOT) {
231 if (rmdir(path) < 0) {
232 if (r == 0 && errno != ENOENT)