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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <sched.h>
#include <sys/mount.h>
#include "alloc-util.h"
#include "homework-mount.h"
#include "mkdir.h"
#include "mount-util.h"
#include "path-util.h"
#include "string-util.h"
static const char *mount_options_for_fstype(const char *fstype) {
if (streq(fstype, "ext4"))
return "noquota,user_xattr";
if (streq(fstype, "xfs"))
return "noquota";
if (streq(fstype, "btrfs"))
return "noacl";
return NULL;
}
int home_mount_node(const char *node, const char *fstype, bool discard, unsigned long flags) {
_cleanup_free_ char *joined = NULL;
const char *options, *discard_option;
int r;
options = mount_options_for_fstype(fstype);
discard_option = discard ? "discard" : "nodiscard";
if (options) {
joined = strjoin(options, ",", discard_option);
if (!joined)
return log_oom();
options = joined;
} else
options = discard_option;
r = mount_nofollow_verbose(LOG_ERR, node, "/run/systemd/user-home-mount", fstype, flags|MS_RELATIME, strempty(options));
if (r < 0)
return r;
log_info("Mounting file system completed.");
return 0;
}
int home_unshare_and_mount(const char *node, const char *fstype, bool discard, unsigned long flags) {
int r;
if (unshare(CLONE_NEWNS) < 0)
return log_error_errno(errno, "Couldn't unshare file system namespace: %m");
r = mount_nofollow_verbose(LOG_ERR, "/run", "/run", NULL, MS_SLAVE|MS_REC, NULL); /* Mark /run as MS_SLAVE in our new namespace */
if (r < 0)
return r;
(void) mkdir_p("/run/systemd/user-home-mount", 0700);
if (node)
return home_mount_node(node, fstype, discard, flags);
return 0;
}
int home_move_mount(const char *user_name_and_realm, const char *target) {
_cleanup_free_ char *subdir = NULL;
const char *d;
int r;
assert(user_name_and_realm);
assert(target);
if (user_name_and_realm) {
subdir = path_join("/run/systemd/user-home-mount/", user_name_and_realm);
if (!subdir)
return log_oom();
d = subdir;
} else
d = "/run/systemd/user-home-mount/";
(void) mkdir_p(target, 0700);
r = mount_nofollow_verbose(LOG_ERR, d, target, NULL, MS_BIND, NULL);
if (r < 0)
return r;
r = umount_verbose(LOG_ERR, "/run/systemd/user-home-mount", UMOUNT_NOFOLLOW);
if (r < 0)
return r;
log_info("Moving to final mount point %s completed.", target);
return 0;
}
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