/*
* This function uses @uf to found corresponding record in @tb, then the record
* from @tb is updated (user specific mount options are added).
*
* Note that @uf must contain only user specific mount options instead of
* VFS options (note that FS options are ignored).
*
* Returns modified filesystem (from @tb) or NULL.
*/
static struct libmnt_fs *mnt_table_merge_user_fs(struct libmnt_table *tb, struct libmnt_fs *uf)
{
struct libmnt_fs *fs;
struct libmnt_iter itr;
const char *optstr, *src, *target, *root, *attrs;
assert(tb);
assert(uf);
if (!tb || !uf)
return NULL;
DBG(TAB, mnt_debug_h(tb, "merging user fs"));
src = mnt_fs_get_srcpath(uf);
target = mnt_fs_get_target(uf);
optstr = mnt_fs_get_user_options(uf);
attrs = mnt_fs_get_attributes(uf);
root = mnt_fs_get_root(uf);
if (!src || !target || !root || (!attrs && !optstr))
return NULL;
mnt_reset_iter(&itr, MNT_ITER_BACKWARD);
while(mnt_table_next_fs(tb, &itr, &fs) == 0) {
const char *s = mnt_fs_get_srcpath(fs),
*t = mnt_fs_get_target(fs),
*r = mnt_fs_get_root(fs);
if (fs->flags & MNT_FS_MERGED)
continue;
if (s && t && r && !strcmp(t, target) &&
!strcmp(s, src) && !strcmp(r, root))
break;
}
if (fs) {
DBG(TAB, mnt_debug_h(tb, "found fs -- appending user optstr"));
mnt_fs_append_options(fs, optstr);
mnt_fs_append_attributes(fs, attrs);
mnt_fs_set_bindsrc(fs, mnt_fs_get_bindsrc(uf));
fs->flags |= MNT_FS_MERGED;
DBG(TAB, mnt_debug_h(tb, "found fs:"));
DBG(TAB, mnt_fs_print_debug(fs, stderr));
}
return fs;
}
static int update_modify_target(struct libmnt_update *upd, struct libmnt_lock *lc)
{
struct libmnt_table *tb = NULL;
int rc = 0;
DBG(UPDATE, mnt_debug_h(upd, "%s: modify target", upd->filename));
if (lc)
rc = mnt_lock_file(lc);
if (rc)
return rc;
tb = __mnt_new_table_from_file(upd->filename,
upd->userspace_only ? MNT_FMT_UTAB : MNT_FMT_MTAB);
if (tb) {
struct libmnt_fs *cur = mnt_table_find_target(tb,
mnt_fs_get_srcpath(upd->fs), MNT_ITER_BACKWARD);
if (cur) {
rc = mnt_fs_set_target(cur, mnt_fs_get_target(upd->fs));
if (!rc)
rc = update_table(upd, tb);
}
}
if (lc)
mnt_unlock_file(lc);
mnt_free_table(tb);
return rc;
}
/**
* mnt_context_next_umount:
* @cxt: context
* @itr: iterator
* @fs: returns the current filesystem
* @mntrc: returns the return code from mnt_context_umount()
* @ignored: returns 1 for not matching
*
* This function tries to umount the next filesystem from mtab (as returned by
* mnt_context_get_mtab()).
*
* You can filter out filesystems by:
* mnt_context_set_options_pattern() to simulate umount -a -O pattern
* mnt_context_set_fstype_pattern() to simulate umount -a -t pattern
*
* If the filesystem is not mounted or does not match the defined criteria,
* then the function mnt_context_next_umount() returns zero, but the @ignored is
* non-zero. Note that the root filesystem is always ignored.
*
* If umount(2) syscall or umount.type helper failed, then the
* mnt_context_next_umount() function returns zero, but the @mntrc is non-zero.
* Use also mnt_context_get_status() to check if the filesystem was
* successfully umounted.
*
* Returns: 0 on success,
* <0 in case of error (!= umount(2) errors)
* 1 at the end of the list.
*/
int mnt_context_next_umount(struct libmnt_context *cxt,
struct libmnt_iter *itr,
struct libmnt_fs **fs,
int *mntrc,
int *ignored)
{
struct libmnt_table *mtab;
const char *tgt;
int rc;
if (ignored)
*ignored = 0;
if (mntrc)
*mntrc = 0;
if (!cxt || !fs || !itr)
return -EINVAL;
rc = mnt_context_get_mtab(cxt, &mtab);
cxt->mtab = NULL; /* do not reset mtab */
mnt_reset_context(cxt);
cxt->mtab = mtab;
if (rc)
return rc;
do {
rc = mnt_table_next_fs(mtab, itr, fs);
if (rc != 0)
return rc; /* no more filesystems (or error) */
tgt = mnt_fs_get_target(*fs);
} while (!tgt);
DBG(CXT, ul_debugobj(cxt, "next-umount: trying %s [fstype: %s, t-pattern: %s, options: %s, O-pattern: %s]", tgt,
mnt_fs_get_fstype(*fs), cxt->fstype_pattern, mnt_fs_get_options(*fs), cxt->optstr_pattern));
/* ignore filesystems which don't match options patterns */
if ((cxt->fstype_pattern && !mnt_fs_match_fstype(*fs,
cxt->fstype_pattern)) ||
/* ignore filesystems which don't match type patterns */
(cxt->optstr_pattern && !mnt_fs_match_options(*fs,
cxt->optstr_pattern))) {
if (ignored)
*ignored = 1;
DBG(CXT, ul_debugobj(cxt, "next-umount: not-match"));
return 0;
}
rc = mnt_context_set_fs(cxt, *fs);
if (rc)
return rc;
rc = mnt_context_umount(cxt);
if (mntrc)
*mntrc = rc;
return 0;
}
/*
* The default is to use fstype from cxt->fs, this could be overwritten by
* @try_type argument.
*
* Returns: 0 on success,
* >0 in case of mount(2) error (returns syscall errno),
* <0 in case of other errors.
*/
static int do_mount(struct libmnt_context *cxt, const char *try_type)
{
int rc = 0;
const char *src, *target, *type;
unsigned long flags;
assert(cxt);
assert(cxt->fs);
assert((cxt->flags & MNT_FL_MOUNTFLAGS_MERGED));
if (try_type && !cxt->helper) {
rc = mnt_context_prepare_helper(cxt, "mount", try_type);
if (!rc)
return rc;
}
if (cxt->helper)
return exec_helper(cxt);
flags = cxt->mountflags;
src = mnt_fs_get_srcpath(cxt->fs);
target = mnt_fs_get_target(cxt->fs);
if (!src || !target)
return -EINVAL;
type = try_type ? : mnt_fs_get_fstype(cxt->fs);
if (!(flags & MS_MGC_MSK))
flags |= MS_MGC_VAL;
DBG(CXT, mnt_debug_h(cxt, "%smount(2) "
"[source=%s, target=%s, type=%s, "
" mountflags=0x%08lx, mountdata=%s]",
(cxt->flags & MNT_FL_FAKE) ? "(FAKE) " : "",
src, target, type,
flags, cxt->mountdata ? "yes" : "<none>"));
if (cxt->flags & MNT_FL_FAKE)
cxt->syscall_status = 0;
else {
if (mount(src, target, type, flags, cxt->mountdata)) {
cxt->syscall_status = -errno;
DBG(CXT, mnt_debug_h(cxt, "mount(2) failed [errno=%d %m]",
-cxt->syscall_status));
return -cxt->syscall_status;
}
DBG(CXT, mnt_debug_h(cxt, "mount(2) success"));
cxt->syscall_status = 0;
}
if (try_type && cxt->update) {
struct libmnt_fs *fs = mnt_update_get_fs(cxt->update);
if (fs)
rc = mnt_fs_set_fstype(fs, try_type);
}
return rc;
}
static int fprintf_utab_fs(FILE *f, struct libmnt_fs *fs)
{
char *p;
int rc = 0;
assert(fs);
assert(f);
if (!fs || !f)
return -EINVAL;
p = mangle(mnt_fs_get_source(fs));
if (p) {
rc = fprintf(f, "SRC=%s ", p);
free(p);
}
if (rc >= 0) {
p = mangle(mnt_fs_get_target(fs));
if (p) {
rc = fprintf(f, "TARGET=%s ", p);
free(p);
}
}
if (rc >= 0) {
p = mangle(mnt_fs_get_root(fs));
if (p) {
rc = fprintf(f, "ROOT=%s ", p);
free(p);
}
}
if (rc >= 0) {
p = mangle(mnt_fs_get_bindsrc(fs));
if (p) {
rc = fprintf(f, "BINDSRC=%s ", p);
free(p);
}
}
if (rc >= 0) {
p = mangle(mnt_fs_get_attributes(fs));
if (p) {
rc = fprintf(f, "ATTRS=%s ", p);
free(p);
}
}
if (rc >= 0) {
p = mangle(mnt_fs_get_user_options(fs));
if (p) {
rc = fprintf(f, "OPTS=%s", p);
free(p);
}
}
if (rc >= 0)
rc = fprintf(f, "\n");
if (rc > 0)
rc = 0; /* success */
return rc;
}
static void verify_mesg(struct verify_context *vfy, char type, const char *fmt, va_list ap)
{
if (!vfy->target_printed) {
fprintf(stdout, "%s\n", mnt_fs_get_target(vfy->fs));
vfy->target_printed = 1;
}
fprintf(stdout, " [%c] ", type);
vfprintf(stdout, fmt, ap);
fputc('\n', stdout);
}
/**
* mnt_table_next_child_fs:
* @tb: mountinfo file (/proc/self/mountinfo)
* @itr: iterator
* @parent: parental FS
* @chld: returns the next child filesystem
*
* Note that filesystems are returned in the order how was mounted (according to
* IDs in /proc/self/mountinfo).
*
* Returns: 0 on success, negative number in case of error or 1 at end of list.
*/
int mnt_table_next_child_fs(struct libmnt_table *tb, struct libmnt_iter *itr,
struct libmnt_fs *parent, struct libmnt_fs **chld)
{
struct libmnt_fs *fs;
int parent_id, lastchld_id = 0, chld_id = 0;
if (!tb || !itr || !parent)
return -EINVAL;
DBG(TAB, mnt_debug_h(tb, "lookup next child of '%s'",
mnt_fs_get_target(parent)));
parent_id = mnt_fs_get_id(parent);
if (!parent_id)
return -EINVAL;
/* get ID of the previously returned child */
if (itr->head && itr->p != itr->head) {
MNT_ITER_ITERATE(itr, fs, struct libmnt_fs, ents);
lastchld_id = mnt_fs_get_id(fs);
}
*chld = NULL;
mnt_reset_iter(itr, MNT_ITER_FORWARD);
while(mnt_table_next_fs(tb, itr, &fs) == 0) {
int id;
if (mnt_fs_get_parent_id(fs) != parent_id)
continue;
id = mnt_fs_get_id(fs);
/* avoid infinite loop. This only happens in rare cases
* such as in early userspace when the rootfs is its own parent */
if (id == parent_id)
continue;
if ((!lastchld_id || id > lastchld_id) &&
(!*chld || id < chld_id)) {
*chld = fs;
chld_id = id;
}
}
if (!chld_id)
return 1; /* end of iterator */
/* set the iterator to the @chld for the next call */
mnt_table_set_iter(tb, itr, *chld);
return 0;
}
static int dir_to_device(const char *spec, dev_t *dev)
{
struct libmnt_table *tb = mnt_new_table_from_file("/proc/self/mountinfo");
struct libmnt_fs *fs;
struct libmnt_cache *cache;
int rc = -1;
if (!tb) {
/*
* Fallback. Traditional way to detect mountpoints. This way
* is independent on /proc, but not able to detect bind mounts.
*/
struct stat pst, st;
char buf[PATH_MAX], *cn;
int len;
if (stat(spec, &st) != 0)
return -1;
cn = mnt_resolve_path(spec, NULL); /* canonicalize */
len = snprintf(buf, sizeof(buf), "%s/..", cn ? cn : spec);
free(cn);
if (len < 0 || (size_t) len + 1 > sizeof(buf))
return -1;
if (stat(buf, &pst) !=0)
return -1;
if ((st.st_dev != pst.st_dev) ||
(st.st_dev == pst.st_dev && st.st_ino == pst.st_ino)) {
*dev = st.st_dev;
return 0;
}
return -1;
}
/* to canonicalize all necessary paths */
cache = mnt_new_cache();
mnt_table_set_cache(tb, cache);
fs = mnt_table_find_target(tb, spec, MNT_ITER_BACKWARD);
if (fs && mnt_fs_get_target(fs)) {
*dev = mnt_fs_get_devno(fs);
rc = 0;
}
mnt_free_table(tb);
mnt_free_cache(cache);
return rc;
}
/**
* mnt_table_add_fs:
* @tb: tab pointer
* @fs: new entry
*
* Adds a new entry to tab and increment @fs reference counter. Don't forget to
* use mnt_unref_fs() after mnt_table_add_fs() you want to keep the @fs
* referenced by the table only.
*
* Returns: 0 on success or negative number in case of error.
*/
int mnt_table_add_fs(struct libmnt_table *tb, struct libmnt_fs *fs)
{
if (!tb || !fs)
return -EINVAL;
mnt_ref_fs(fs);
list_add_tail(&fs->ents, &tb->ents);
tb->nents++;
DBG(TAB, ul_debugobj(tb, "add entry: %s %s",
mnt_fs_get_source(fs), mnt_fs_get_target(fs)));
return 0;
}
static int dir_to_device(struct mountpoint_control *ctl)
{
struct libmnt_table *tb = mnt_new_table_from_file(_PATH_PROC_MOUNTINFO);
struct libmnt_fs *fs;
struct libmnt_cache *cache;
int rc = -1;
if (!tb) {
/*
* Fallback. Traditional way to detect mountpoints. This way
* is independent on /proc, but not able to detect bind mounts.
*/
struct stat pst;
char buf[PATH_MAX], *cn;
int len;
cn = mnt_resolve_path(ctl->path, NULL); /* canonicalize */
len = snprintf(buf, sizeof(buf), "%s/..", cn ? cn : ctl->path);
free(cn);
if (len < 0 || (size_t) len >= sizeof(buf))
return -1;
if (stat(buf, &pst) !=0)
return -1;
if ((ctl->st.st_dev != pst.st_dev) ||
(ctl->st.st_dev == pst.st_dev && ctl->st.st_ino == pst.st_ino)) {
ctl->dev = ctl->st.st_dev;
return 0;
}
return -1;
}
/* to canonicalize all necessary paths */
cache = mnt_new_cache();
mnt_table_set_cache(tb, cache);
mnt_unref_cache(cache);
fs = mnt_table_find_target(tb, ctl->path, MNT_ITER_BACKWARD);
if (fs && mnt_fs_get_target(fs)) {
ctl->dev = mnt_fs_get_devno(fs);
rc = 0;
}
mnt_unref_table(tb);
return rc;
}
/**
* mnt_table_add_fs:
* @tb: tab pointer
* @fs: new entry
*
* Adds a new entry to tab.
*
* Returns: 0 on success or negative number in case of error.
*/
int mnt_table_add_fs(struct libmnt_table *tb, struct libmnt_fs *fs)
{
assert(tb);
assert(fs);
if (!tb || !fs)
return -EINVAL;
list_add_tail(&fs->ents, &tb->ents);
DBG(TAB, mnt_debug_h(tb, "add entry: %s %s",
mnt_fs_get_source(fs), mnt_fs_get_target(fs)));
tb->nents++;
return 0;
}
static char *dir_to_device(const char *spec)
{
struct libmnt_table *tb = mnt_new_table_from_file("/proc/self/mountinfo");
struct libmnt_fs *fs;
char *res = NULL;
if (!tb)
return NULL;
fs = mnt_table_find_target(tb, spec, MNT_ITER_BACKWARD);
if (fs && mnt_fs_get_target(fs))
res = xstrdup(mnt_fs_get_source(fs));
mnt_free_table(tb);
return res;
}
int main(const int argc, const char* argv[]) {
if (argc == 2) {
if (strcmp(argv[1], "--verbose") == 0) {
verbose_mode = 1;
}
}
prepare();
clearSupplementaryGroups();
selfCheck();
struct libmnt_table* mt = mnt_new_table_from_file("/opt/xware_desktop/mounts");
if (mt == NULL) {
fprintf(stderr, "mnt_new_table_from_file failed.\n");
exit(EXIT_FAILURE);
}
struct libmnt_iter* itr = mnt_new_iter(MNT_ITER_FORWARD);
struct libmnt_fs* fs = NULL;
while(1) {
int tmp = mnt_table_find_next_fs(mt, itr, &matchAll, NULL, &fs);
if (tmp < 0) { // error
fprintf(stderr, "mnt_table_find_next_fs failed.\n");
break;
} else {
if (tmp == 1) { // reach EOF
break;
}
const char* target = mnt_fs_get_target(fs);
if (target == NULL) {
fprintf(stderr, "mnt_fs_get_target failed.\n");
} else {
printf("%s%s%s\n", BOLD, target, NOSTYLE);
printf("================================\n");
if (checkDirXPermissions(target)) {
checkTargetDirPermissions(target);
}
printf("\n");
}
}
}
printf("%s", NOSTYLE);
mnt_free_fs(fs);
mnt_free_iter(itr);
mnt_free_table(mt);
return 0;
}
static int try_mount(struct libmnt_context *cxt, int bg)
{
struct libmnt_fs *fs;
const char *p;
char *src = NULL, *tgt = NULL, *type = NULL, *opts = NULL;
unsigned long flags = 0;
int fake, ret = 0;
fs = mnt_context_get_fs(cxt);
/* libmount returns read-only pointers (const char)
* so, reallocate for nfsmount() functions.
*/
if ((p = mnt_fs_get_source(fs))) /* spec */
src = strdup(p);
if ((p = mnt_fs_get_target(fs))) /* mountpoint */
tgt = strdup(p);
if ((p = mnt_fs_get_fstype(fs))) /* FS type */
type = strdup(p);
if ((p = mnt_fs_get_fs_options(fs))) /* mount options */
opts = strdup(p);
mnt_context_get_mflags(cxt, &flags); /* mount(2) flags */
fake = mnt_context_is_fake(cxt);
if (string)
ret = nfsmount_string(src, tgt, type, flags, &opts, fake, bg);
else if (strcmp(type, "nfs4") == 0)
ret = nfs4mount(src, tgt, flags, &opts, fake, bg);
else
ret = nfsmount(src, tgt, flags, &opts, fake, bg);
/* Store mount options if not called with mount --no-mtab */
if (!ret && !mnt_context_is_nomtab(cxt))
store_mount_options(fs, opts);
free(src);
free(tgt);
free(type);
free(opts);
return ret;
}
/**
* mnt_context_prepare_mount:
* @cxt: context
*
* Prepare context for mounting, unnecessary for mnt_context_mount().
*
* Returns: negative number on error, zero on success
*/
int mnt_context_prepare_mount(struct libmnt_context *cxt)
{
int rc = -EINVAL;
assert(cxt);
assert(cxt->fs);
assert(cxt->helper_exec_status == 1);
assert(cxt->syscall_status == 1);
if (!cxt || !cxt->fs || mnt_fs_is_swaparea(cxt->fs))
return -EINVAL;
if (!mnt_fs_get_source(cxt->fs) && !mnt_fs_get_target(cxt->fs))
return -EINVAL;
if (cxt->flags & MNT_FL_PREPARED)
return 0;
cxt->action = MNT_ACT_MOUNT;
DBG(CXT, mnt_debug_h(cxt, "mount: preparing"));
/* TODO: fstab is unnecessary for MS_{MOVE,BIND,STARED,...} */
rc = mnt_context_apply_fstab(cxt);
if (!rc)
rc = mnt_context_merge_mflags(cxt);
if (!rc)
rc = evaluate_permissions(cxt);
if (!rc)
rc = fix_optstr(cxt);
if (!rc)
rc = mnt_context_prepare_srcpath(cxt);
if (!rc)
rc = mnt_context_prepare_target(cxt);
if (!rc)
rc = mnt_context_guess_fstype(cxt);
if (!rc)
rc = mnt_context_prepare_helper(cxt, "mount", NULL);
if (rc) {
DBG(CXT, mnt_debug_h(cxt, "mount: preparing failed"));
return rc;
}
cxt->flags |= MNT_FL_PREPARED;
return rc;
}
/*
* See if device has been mounted by looking in mount table. If so, set
* device name and mount point name, and return 1, otherwise return 0.
*/
static int device_get_mountpoint(char **devname, char **mnt)
{
struct libmnt_fs *fs;
int rc;
*mnt = NULL;
if (!mtab) {
mtab = mnt_new_table();
if (!mtab)
err(EXIT_FAILURE, _("failed to initialize libmount table"));
cache = mnt_new_cache();
mnt_table_set_cache(mtab, cache);
if (p_option)
rc = mnt_table_parse_file(mtab, _PATH_PROC_MOUNTINFO);
else
rc = mnt_table_parse_mtab(mtab, NULL);
if (rc)
err(EXIT_FAILURE, _("failed to parse mount table"));
}
fs = mnt_table_find_source(mtab, *devname, MNT_ITER_BACKWARD);
if (!fs) {
/* maybe 'devname' is mountpoint rather than a real device */
fs = mnt_table_find_target(mtab, *devname, MNT_ITER_BACKWARD);
if (fs) {
free(*devname);
*devname = xstrdup(mnt_fs_get_source(fs));
}
}
if (fs) {
*mnt = xstrdup(mnt_fs_get_target(fs));
/* We'll call umount(), so remove the filesystem from the table
* to avoid duplicate results in the next device_get_mountpoint()
* call */
mnt_free_fs(fs);
}
return *mnt ? 0 : -1;
}
static int get_debugfs(char **path)
{
struct libmnt_context *cxt;
struct libmnt_table *tb;
struct libmnt_iter *itr = NULL;
struct libmnt_fs *fs;
int found = 0, ret;
cxt = mnt_new_context();
if (!cxt)
err(EXIT_FAILURE, "libmount context allocation failed");
itr = mnt_new_iter(MNT_ITER_FORWARD);
if (!itr)
err(EXIT_FAILURE, "failed to initialize libmount iterator");
if (mnt_context_get_mtab(cxt, &tb))
err(EXIT_FAILURE, "failed to read mtab");
while (mnt_table_next_fs(tb, itr, &fs) == 0) {
const char *type = mnt_fs_get_fstype(fs);
if (!strcmp(type, "debugfs")) {
found = 1;
break;
}
}
if (found) {
ret = asprintf(path, "%s/gpio", mnt_fs_get_target(fs));
if (ret < 0)
err(EXIT_FAILURE, "failed to format string");
}
mnt_free_iter(itr);
mnt_free_context(cxt);
if (!found)
return -1;
return 0;
}
/*
* See if device has been mounted by looking in mount table. If so, set
* device name and mount point name, and return 1, otherwise return 0.
*/
static int device_get_mountpoint(char **devname, char **mnt)
{
struct libmnt_fs *fs;
int rc;
*mnt = NULL;
if (!mtab) {
struct libmnt_cache *cache;
mtab = mnt_new_table();
if (!mtab)
err(EXIT_FAILURE, _("failed to initialize libmount table"));
cache = mnt_new_cache();
mnt_table_set_cache(mtab, cache);
mnt_unref_cache(cache);
if (p_option)
rc = mnt_table_parse_file(mtab, _PATH_PROC_MOUNTINFO);
else
rc = mnt_table_parse_mtab(mtab, NULL);
if (rc)
err(EXIT_FAILURE, _("failed to parse mount table"));
}
fs = mnt_table_find_source(mtab, *devname, MNT_ITER_BACKWARD);
if (!fs) {
/* maybe 'devname' is mountpoint rather than a real device */
fs = mnt_table_find_target(mtab, *devname, MNT_ITER_BACKWARD);
if (fs) {
free(*devname);
*devname = xstrdup(mnt_fs_get_source(fs));
}
}
if (fs)
*mnt = xstrdup(mnt_fs_get_target(fs));
return *mnt ? 0 : -1;
}
static int update_modify_options(struct libmnt_update *upd, struct libmnt_lock *lc)
{
struct libmnt_table *tb = NULL;
int rc = 0;
struct libmnt_fs *fs;
assert(upd);
assert(upd->fs);
DBG(UPDATE, mnt_debug_h(upd, "%s: modify options", upd->filename));
fs = upd->fs;
if (lc)
rc = mnt_lock_file(lc);
if (rc)
return rc;
tb = __mnt_new_table_from_file(upd->filename,
upd->userspace_only ? MNT_FMT_UTAB : MNT_FMT_MTAB);
if (tb) {
struct libmnt_fs *cur = mnt_table_find_target(tb,
mnt_fs_get_target(fs),
MNT_ITER_BACKWARD);
if (cur) {
if (upd->userspace_only)
rc = mnt_fs_set_attributes(cur, mnt_fs_get_attributes(fs));
if (!rc)
rc = mnt_fs_set_options(cur, mnt_fs_get_options(fs));
if (!rc)
rc = update_table(upd, tb);
}
}
if (lc)
mnt_unlock_file(lc);
mnt_free_table(tb);
return rc;
}
/* mtab and fstab update -- returns zero on success
*/
static int fprintf_mtab_fs(FILE *f, struct libmnt_fs *fs)
{
const char *o, *src, *fstype;
char *m1, *m2, *m3, *m4;
int rc;
assert(fs);
assert(f);
src = mnt_fs_get_source(fs);
fstype = mnt_fs_get_fstype(fs);
o = mnt_fs_get_options(fs);
m1 = src ? mangle(src) : "none";
m2 = mangle(mnt_fs_get_target(fs));
m3 = fstype ? mangle(fstype) : "none";
m4 = o ? mangle(o) : "rw";
if (m1 && m2 && m3 && m4) {
rc = fprintf(f, "%s %s %s %s %d %d\n",
m1, m2, m3, m4,
mnt_fs_get_freq(fs),
mnt_fs_get_passno(fs));
if (rc > 0)
rc = 0;
} else
rc = -ENOMEM;
if (src)
free(m1);
free(m2);
if (fstype)
free(m3);
if (o)
free(m4);
return rc;
}
/**
* mnt_context_find_umount_fs:
* @cxt: mount context
* @tgt: mountpoint, device, ...
* @pfs: returns point to filesystem
*
* Returns: 0 on success, <0 on error, 1 if target filesystem not found
*/
int mnt_context_find_umount_fs(struct libmnt_context *cxt,
const char *tgt,
struct libmnt_fs **pfs)
{
int rc;
struct libmnt_table *mtab = NULL;
struct libmnt_fs *fs;
char *loopdev = NULL;
if (pfs)
*pfs = NULL;
if (!cxt || !tgt || !pfs)
return -EINVAL;
DBG(CXT, ul_debugobj(cxt, "umount: lookup FS for '%s'", tgt));
if (!*tgt)
return 1; /* empty string is not an error */
/*
* The mount table may be huge, and on systems with utab we have to merge
* userspace mount options into /proc/self/mountinfo. This all is
* expensive. The tab filter allows to filter out entries, then
* a mount table and utab are very tiny files.
*
* *but*... the filter uses mnt_fs_streq_{target,srcpath} functions
* where LABEL, UUID or symlinks are canonicalized. It means that
* it's usable only for canonicalized stuff (e.g. kernel mountinfo).
*/
if (!mnt_context_mtab_writable(cxt) && *tgt == '/' &&
!mnt_context_is_force(cxt) && !mnt_context_is_lazy(cxt))
rc = mnt_context_get_mtab_for_target(cxt, &mtab, tgt);
else
rc = mnt_context_get_mtab(cxt, &mtab);
if (rc) {
DBG(CXT, ul_debugobj(cxt, "umount: failed to read mtab"));
return rc;
}
if (mnt_table_get_nents(mtab) == 0) {
DBG(CXT, ul_debugobj(cxt, "umount: mtab empty"));
return 1;
}
try_loopdev:
fs = mnt_table_find_target(mtab, tgt, MNT_ITER_BACKWARD);
if (!fs && mnt_context_is_swapmatch(cxt)) {
/*
* Maybe the option is source rather than target (sometimes
* people use e.g. "umount /dev/sda1")
*/
fs = mnt_table_find_source(mtab, tgt, MNT_ITER_BACKWARD);
if (fs) {
struct libmnt_fs *fs1 = mnt_table_find_target(mtab,
mnt_fs_get_target(fs),
MNT_ITER_BACKWARD);
if (!fs1) {
DBG(CXT, ul_debugobj(cxt, "mtab is broken?!?!"));
rc = -EINVAL;
goto err;
}
if (fs != fs1) {
/* Something was stacked over `file' on the
* same mount point. */
DBG(CXT, ul_debugobj(cxt,
"umount: %s: %s is mounted "
"over it on the same point",
tgt, mnt_fs_get_source(fs1)));
rc = -EINVAL;
goto err;
}
}
}
if (!fs && !loopdev && mnt_context_is_swapmatch(cxt)) {
/*
* Maybe the option is /path/file.img, try to convert to /dev/loopN
*/
struct stat st;
if (mnt_stat_mountpoint(tgt, &st) == 0 && S_ISREG(st.st_mode)) {
int count;
struct libmnt_cache *cache = mnt_context_get_cache(cxt);
const char *bf = cache ? mnt_resolve_path(tgt, cache) : tgt;
count = loopdev_count_by_backing_file(bf, &loopdev);
if (count == 1) {
DBG(CXT, ul_debugobj(cxt,
"umount: %s --> %s (retry)", tgt, loopdev));
tgt = loopdev;
goto try_loopdev;
} else if (count > 1)
DBG(CXT, ul_debugobj(cxt,
"umount: warning: %s is associated "
"with more than one loopdev", tgt));
}
}
if (pfs)
*pfs = fs;
free(loopdev);
DBG(CXT, ul_debugobj(cxt, "umount fs: %s", fs ? mnt_fs_get_target(fs) :
"<not found>"));
return fs ? 0 : 1;
err:
free(loopdev);
return rc;
}
static int lookup_umount_fs(struct libmnt_context *cxt)
{
int rc, loopdev = 0;
const char *tgt;
struct libmnt_table *mtab = NULL;
struct libmnt_fs *fs;
struct libmnt_cache *cache = NULL;
char *cn_tgt = NULL;
assert(cxt);
assert(cxt->fs);
DBG(CXT, mnt_debug_h(cxt, "umount: lookup FS"));
tgt = mnt_fs_get_target(cxt->fs);
if (!tgt) {
DBG(CXT, mnt_debug_h(cxt, "umount: undefined target"));
return -EINVAL;
}
/*
* The mtab file maybe huge and on systems with utab we have to merge
* userspace mount options into /proc/self/mountinfo. This all is
* expensive. The mtab filter allows to filter out entries, then
* mtab and utab are very tiny files.
*
* *but*... the filter uses mnt_fs_streq_{target,srcpath} functions
* where LABEL, UUID or symlinks are to canonicalized. It means that
* it's usable only for canonicalized stuff (e.g. kernel mountinfo).
*/
if (!cxt->mtab_writable && *tgt == '/' &&
!mnt_context_is_force(cxt) && !mnt_context_is_lazy(cxt)) {
struct stat st;
if (stat(tgt, &st) == 0 && S_ISDIR(st.st_mode)) {
/* we'll canonicalized /proc/self/mountinfo */
cache = mnt_context_get_cache(cxt);
cn_tgt = mnt_resolve_path(tgt, cache);
if (cn_tgt)
mnt_context_set_tabfilter(cxt, mtab_filter, cn_tgt);
}
}
rc = mnt_context_get_mtab(cxt, &mtab);
if (cn_tgt) {
mnt_context_set_tabfilter(cxt, NULL, NULL);
if (!cache)
free(cn_tgt);
}
if (rc) {
DBG(CXT, mnt_debug_h(cxt, "umount: failed to read mtab"));
return rc;
}
try_loopdev:
fs = mnt_table_find_target(mtab, tgt, MNT_ITER_BACKWARD);
if (!fs && mnt_context_is_swapmatch(cxt)) {
/*
* Maybe the option is source rather than target (sometimes
* people use e.g. "umount /dev/sda1")
*/
fs = mnt_table_find_source(mtab, tgt, MNT_ITER_BACKWARD);
if (fs) {
struct libmnt_fs *fs1 = mnt_table_find_target(mtab,
mnt_fs_get_target(fs),
MNT_ITER_BACKWARD);
if (!fs1) {
DBG(CXT, mnt_debug_h(cxt, "mtab is broken?!?!"));
return -EINVAL;
}
if (fs != fs1) {
/* Something was stacked over `file' on the
* same mount point. */
DBG(CXT, mnt_debug_h(cxt,
"umount: %s: %s is mounted "
"over it on the same point",
tgt, mnt_fs_get_source(fs1)));
return -EINVAL;
}
}
}
if (!fs && !loopdev && mnt_context_is_swapmatch(cxt)) {
/*
* Maybe the option is /path/file.img, try to convert to /dev/loopN
*/
struct stat st;
if (stat(tgt, &st) == 0 && S_ISREG(st.st_mode)) {
char *dev = NULL;
int count = loopdev_count_by_backing_file(tgt, &dev);
if (count == 1) {
DBG(CXT, mnt_debug_h(cxt,
"umount: %s --> %s (retry)", tgt, dev));
mnt_fs_set_source(cxt->fs, tgt);
mnt_fs_set_target(cxt->fs, dev);
free(dev);
tgt = mnt_fs_get_target(cxt->fs);
loopdev = 1; /* to avoid endless loop */
goto try_loopdev;
} else if (count > 1)
DBG(CXT, mnt_debug_h(cxt,
"umount: warning: %s is associated "
"with more than one loopdev", tgt));
}
}
if (!fs) {
DBG(CXT, mnt_debug_h(cxt, "umount: cannot find %s in mtab", tgt));
return 0;
}
if (fs != cxt->fs) {
/* copy from mtab to our FS description
*/
mnt_fs_set_source(cxt->fs, NULL);
mnt_fs_set_target(cxt->fs, NULL);
if (!mnt_copy_fs(cxt->fs, fs)) {
DBG(CXT, mnt_debug_h(cxt, "umount: failed to copy FS"));
return -errno;
}
DBG(CXT, mnt_debug_h(cxt, "umount: mtab applied"));
}
cxt->flags |= MNT_FL_TAB_APPLIED;
return rc;
}
static int do_umount(struct libmnt_context *cxt)
{
int rc = 0, flags = 0;
const char *src, *target;
char *tgtbuf = NULL;
assert(cxt);
assert(cxt->fs);
assert((cxt->flags & MNT_FL_MOUNTFLAGS_MERGED));
assert(cxt->syscall_status == 1);
if (cxt->helper)
return exec_helper(cxt);
src = mnt_fs_get_srcpath(cxt->fs);
target = mnt_fs_get_target(cxt->fs);
if (!target)
return -EINVAL;
DBG(CXT, mnt_debug_h(cxt, "do umount"));
if (cxt->restricted && !mnt_context_is_fake(cxt)) {
/*
* extra paranoia for non-root users
* -- chdir to the parent of the mountpoint and use NOFOLLOW
* flag to avoid races and symlink attacks.
*/
if (umount_nofollow_support())
flags |= UMOUNT_NOFOLLOW;
rc = mnt_chdir_to_parent(target, &tgtbuf);
if (rc)
return rc;
target = tgtbuf;
}
if (mnt_context_is_lazy(cxt))
flags |= MNT_DETACH;
else if (mnt_context_is_force(cxt))
flags |= MNT_FORCE;
DBG(CXT, mnt_debug_h(cxt, "umount(2) [target='%s', flags=0x%08x]%s",
target, flags,
mnt_context_is_fake(cxt) ? " (FAKE)" : ""));
if (mnt_context_is_fake(cxt))
rc = 0;
else {
rc = flags ? umount2(target, flags) : umount(target);
if (rc < 0)
cxt->syscall_status = -errno;
free(tgtbuf);
}
/*
* try remount read-only
*/
if (rc < 0
&& cxt->syscall_status == -EBUSY
&& mnt_context_is_rdonly_umount(cxt)
&& src) {
mnt_context_set_mflags(cxt, (cxt->mountflags |
MS_REMOUNT | MS_RDONLY));
mnt_context_enable_loopdel(cxt, FALSE);
DBG(CXT, mnt_debug_h(cxt,
"umount(2) failed [errno=%d] -- trying to remount read-only",
-cxt->syscall_status));
rc = mount(src, mnt_fs_get_target(cxt->fs), NULL,
MS_MGC_VAL | MS_REMOUNT | MS_RDONLY, NULL);
if (rc < 0) {
cxt->syscall_status = -errno;
DBG(CXT, mnt_debug_h(cxt,
"read-only re-mount(2) failed [errno=%d]",
-cxt->syscall_status));
return -cxt->syscall_status;
}
cxt->syscall_status = 0;
DBG(CXT, mnt_debug_h(cxt, "read-only re-mount(2) success"));
return 0;
}
if (rc < 0) {
DBG(CXT, mnt_debug_h(cxt, "umount(2) failed [errno=%d]",
-cxt->syscall_status));
return -cxt->syscall_status;
}
cxt->syscall_status = 0;
DBG(CXT, mnt_debug_h(cxt, "umount(2) success"));
return 0;
}
static int exec_helper(struct libmnt_context *cxt)
{
int rc;
assert(cxt);
assert(cxt->fs);
assert(cxt->helper);
assert((cxt->flags & MNT_FL_MOUNTFLAGS_MERGED));
assert(cxt->helper_exec_status == 1);
DBG_FLUSH;
switch (fork()) {
case 0:
{
const char *args[10], *type;
int i = 0;
if (setgid(getgid()) < 0)
exit(EXIT_FAILURE);
if (setuid(getuid()) < 0)
exit(EXIT_FAILURE);
type = mnt_fs_get_fstype(cxt->fs);
args[i++] = cxt->helper; /* 1 */
args[i++] = mnt_fs_get_target(cxt->fs); /* 2 */
if (mnt_context_is_nomtab(cxt))
args[i++] = "-n"; /* 3 */
if (mnt_context_is_lazy(cxt))
args[i++] = "-l"; /* 4 */
if (mnt_context_is_force(cxt))
args[i++] = "-f"; /* 5 */
if (mnt_context_is_verbose(cxt))
args[i++] = "-v"; /* 6 */
if (mnt_context_is_rdonly_umount(cxt))
args[i++] = "-r"; /* 7 */
if (type && !endswith(cxt->helper, type)) {
args[i++] = "-t"; /* 8 */
args[i++] = (char *) type; /* 9 */
}
args[i] = NULL; /* 10 */
#ifdef CONFIG_LIBMOUNT_DEBUG
for (i = 0; args[i]; i++)
DBG(CXT, mnt_debug_h(cxt, "argv[%d] = \"%s\"",
i, args[i]));
#endif
DBG_FLUSH;
execv(cxt->helper, (char * const *) args);
exit(EXIT_FAILURE);
}
default:
{
int st;
wait(&st);
cxt->helper_status = WIFEXITED(st) ? WEXITSTATUS(st) : -1;
DBG(CXT, mnt_debug_h(cxt, "%s executed [status=%d]",
cxt->helper, cxt->helper_status));
cxt->helper_exec_status = rc = 0;
break;
}
case -1:
cxt->helper_exec_status = rc = -errno;
DBG(CXT, mnt_debug_h(cxt, "fork() failed"));
break;
}
return rc;
}
/*
* Note that cxt->fs contains relevant mtab entry!
*/
static int evaluate_permissions(struct libmnt_context *cxt)
{
struct libmnt_table *fstab;
unsigned long u_flags = 0;
const char *tgt, *src, *optstr;
int rc, ok = 0;
struct libmnt_fs *fs;
assert(cxt);
assert(cxt->fs);
assert((cxt->flags & MNT_FL_MOUNTFLAGS_MERGED));
if (!cxt || !cxt->fs)
return -EINVAL;
if (!mnt_context_is_restricted(cxt))
return 0; /* superuser mount */
DBG(CXT, mnt_debug_h(cxt, "umount: evaluating permissions"));
if (!(cxt->flags & MNT_FL_TAB_APPLIED)) {
DBG(CXT, mnt_debug_h(cxt,
"cannot find %s in mtab and you are not root",
mnt_fs_get_target(cxt->fs)));
goto eperm;
}
if (cxt->user_mountflags & MNT_MS_UHELPER) {
/* on uhelper= mount option based helper */
rc = prepare_helper_from_options(cxt, "uhelper");
if (rc)
return rc;
if (cxt->helper)
return 0; /* we'll call /sbin/umount.<uhelper> */
}
/*
* User mounts has to be in /etc/fstab
*/
rc = mnt_context_get_fstab(cxt, &fstab);
if (rc)
return rc;
tgt = mnt_fs_get_target(cxt->fs);
src = mnt_fs_get_source(cxt->fs);
if (mnt_fs_get_bindsrc(cxt->fs)) {
src = mnt_fs_get_bindsrc(cxt->fs);
DBG(CXT, mnt_debug_h(cxt,
"umount: using bind source: %s", src));
}
/* If fstab contains the two lines
* /dev/sda1 /mnt/zip auto user,noauto 0 0
* /dev/sda4 /mnt/zip auto user,noauto 0 0
* then "mount /dev/sda4" followed by "umount /mnt/zip" used to fail.
* So, we must not look for file, but for the pair (dev,file) in fstab.
*/
fs = mnt_table_find_pair(fstab, src, tgt, MNT_ITER_FORWARD);
if (!fs) {
/*
* It's possible that there is /path/file.img in fstab and
* /dev/loop0 in mtab -- then we have to check releation
* between loopdev and the file.
*/
fs = mnt_table_find_target(fstab, tgt, MNT_ITER_FORWARD);
if (fs) {
const char *dev = mnt_fs_get_srcpath(cxt->fs); /* devname from mtab */
if (!dev || !is_associated_fs(dev, fs))
fs = NULL;
}
if (!fs) {
DBG(CXT, mnt_debug_h(cxt,
"umount %s: mtab disagrees with fstab",
tgt));
goto eperm;
}
}
/*
* User mounting and unmounting is allowed only if fstab contains one
* of the options `user', `users' or `owner' or `group'.
*
* The option `users' allows arbitrary users to mount and unmount -
* this may be a security risk.
*
* The options `user', `owner' and `group' only allow unmounting by the
* user that mounted (visible in mtab).
*/
optstr = mnt_fs_get_user_options(fs); /* FSTAB mount options! */
if (!optstr)
goto eperm;
if (mnt_optstr_get_flags(optstr, &u_flags,
mnt_get_builtin_optmap(MNT_USERSPACE_MAP)))
goto eperm;
if (u_flags & MNT_MS_USERS) {
DBG(CXT, mnt_debug_h(cxt,
"umount: promiscuous setting ('users') in fstab"));
return 0;
}
/*
* Check user=<username> setting from mtab if there is user, owner or
* group option in /etc/fstab
*/
if (u_flags & (MNT_MS_USER | MNT_MS_OWNER | MNT_MS_GROUP)) {
char *curr_user = NULL;
char *mtab_user = NULL;
size_t sz;
DBG(CXT, mnt_debug_h(cxt,
"umount: checking user=<username> from mtab"));
curr_user = mnt_get_username(getuid());
if (!curr_user) {
DBG(CXT, mnt_debug_h(cxt, "umount %s: cannot "
"convert %d to username", tgt, getuid()));
goto eperm;
}
/* get options from mtab */
optstr = mnt_fs_get_user_options(cxt->fs);
if (optstr && !mnt_optstr_get_option(optstr,
"user", &mtab_user, &sz) && sz)
ok = !strncmp(curr_user, mtab_user, sz);
}
if (ok) {
DBG(CXT, mnt_debug_h(cxt, "umount %s is allowed", tgt));
return 0;
}
eperm:
DBG(CXT, mnt_debug_h(cxt, "umount is not allowed for you"));
return -EPERM;
}
static int lookup_umount_fs(struct libmnt_context *cxt)
{
int rc, loopdev = 0;
const char *tgt;
struct libmnt_table *mtab = NULL;
struct libmnt_fs *fs;
assert(cxt);
assert(cxt->fs);
DBG(CXT, mnt_debug_h(cxt, "umount: lookup FS"));
tgt = mnt_fs_get_target(cxt->fs);
if (!tgt) {
DBG(CXT, mnt_debug_h(cxt, "umount: undefined target"));
return -EINVAL;
}
rc = mnt_context_get_mtab(cxt, &mtab);
if (rc) {
DBG(CXT, mnt_debug_h(cxt, "umount: failed to read mtab"));
return rc;
}
try_loopdev:
fs = mnt_table_find_target(mtab, tgt, MNT_ITER_BACKWARD);
if (!fs) {
/* maybe the option is source rather than target (mountpoint) */
fs = mnt_table_find_source(mtab, tgt, MNT_ITER_BACKWARD);
if (fs) {
struct libmnt_fs *fs1 = mnt_table_find_target(mtab,
mnt_fs_get_target(fs),
MNT_ITER_BACKWARD);
if (!fs1) {
DBG(CXT, mnt_debug_h(cxt, "mtab is broken?!?!"));
return -EINVAL;
}
if (fs != fs1) {
/* Something was stacked over `file' on the
* same mount point. */
DBG(CXT, mnt_debug_h(cxt,
"umount: %s: %s is mounted "
"over it on the same point",
tgt, mnt_fs_get_source(fs1)));
return -EINVAL;
}
}
}
if (!fs && !loopdev) {
/*
* Maybe target is /path/file.img, try to convert to /dev/loopN
*/
struct stat st;
if (stat(tgt, &st) == 0 && S_ISREG(st.st_mode)) {
char *dev = NULL;
int count = loopdev_count_by_backing_file(tgt, &dev);
if (count == 1) {
DBG(CXT, mnt_debug_h(cxt,
"umount: %s --> %s (retry)", tgt, dev));
mnt_fs_set_source(cxt->fs, tgt);
mnt_fs_set_target(cxt->fs, dev);
free(dev);
tgt = mnt_fs_get_target(cxt->fs);
loopdev = 1; /* to avoid endless loop */
goto try_loopdev;
} else if (count > 1)
DBG(CXT, mnt_debug_h(cxt,
"umount: warning: %s is associated "
"with more than one loodev", tgt));
}
}
if (!fs) {
DBG(CXT, mnt_debug_h(cxt, "umount: cannot find %s in mtab", tgt));
return 0;
}
if (fs != cxt->fs) {
/* copy from mtab to our FS description
*/
mnt_fs_set_source(cxt->fs, NULL);
mnt_fs_set_target(cxt->fs, NULL);
if (!mnt_copy_fs(cxt->fs, fs)) {
DBG(CXT, mnt_debug_h(cxt, "umount: failed to copy FS"));
return -errno;
}
DBG(CXT, mnt_debug_h(cxt, "umount: mtab applied"));
}
cxt->flags |= MNT_FL_TAB_APPLIED;
return rc;
}
static int exec_helper(struct libmnt_context *cxt)
{
char *o = NULL;
int rc;
assert(cxt);
assert(cxt->fs);
assert(cxt->helper);
assert((cxt->flags & MNT_FL_MOUNTFLAGS_MERGED));
DBG(CXT, mnt_debug_h(cxt, "mount: executing helper %s", cxt->helper));
rc = generate_helper_optstr(cxt, &o);
if (rc)
return -EINVAL;
DBG_FLUSH;
switch (fork()) {
case 0:
{
const char *args[12], *type;
int i = 0;
if (setgid(getgid()) < 0)
exit(EXIT_FAILURE);
if (setuid(getuid()) < 0)
exit(EXIT_FAILURE);
type = mnt_fs_get_fstype(cxt->fs);
args[i++] = cxt->helper; /* 1 */
args[i++] = mnt_fs_get_srcpath(cxt->fs);/* 2 */
args[i++] = mnt_fs_get_target(cxt->fs); /* 3 */
/*
* TODO: remove the exception for "nfs", -s is documented
* for years should be usable everywhere.
*/
if (mnt_context_is_sloppy(cxt) &&
type && startswith(type, "nfs"))
args[i++] = "-s"; /* 4 */
if (mnt_context_is_fake(cxt))
args[i++] = "-f"; /* 5 */
if (mnt_context_is_nomtab(cxt))
args[i++] = "-n"; /* 6 */
if (mnt_context_is_verbose(cxt))
args[i++] = "-v"; /* 7 */
if (o) {
args[i++] = "-o"; /* 8 */
args[i++] = o; /* 9 */
}
if (type && !endswith(cxt->helper, type)) {
args[i++] = "-t"; /* 10 */
args[i++] = type; /* 11 */
}
args[i] = NULL; /* 12 */
#ifdef CONFIG_LIBMOUNT_DEBUG
for (i = 0; args[i]; i++)
DBG(CXT, mnt_debug_h(cxt, "argv[%d] = \"%s\"",
i, args[i]));
#endif
DBG_FLUSH;
execv(cxt->helper, (char * const *) args);
exit(EXIT_FAILURE);
}
default:
{
int st;
wait(&st);
cxt->helper_status = WIFEXITED(st) ? WEXITSTATUS(st) : -1;
DBG(CXT, mnt_debug_h(cxt, "%s executed [status=%d]",
cxt->helper, cxt->helper_status));
cxt->helper_exec_status = rc = 0;
break;
}
case -1:
cxt->helper_exec_status = rc = -errno;
DBG(CXT, mnt_debug_h(cxt, "fork() failed"));
break;
}
return rc;
}
/* this is umount replacement to mnt_context_apply_fstab(), use
* mnt_context_tab_applied() to check result.
*/
static int lookup_umount_fs(struct libmnt_context *cxt)
{
const char *tgt;
struct stat st;
struct libmnt_fs *fs = NULL;
int rc = 0;
assert(cxt);
assert(cxt->fs);
tgt = mnt_fs_get_target(cxt->fs);
if (!tgt) {
DBG(CXT, ul_debugobj(cxt, "umount: undefined target"));
return -EINVAL;
}
/*
* Let's try to avoid mountinfo usage at all to minimize performance
* degradation. Don't forget that kernel has to compose *whole*
* mountinfo about all mountpoints although we look for only one entry.
*
* All we need is fstype and to check if there is no userspace mount
* options for the target (e.g. helper=udisks to call /sbin/umount.udisks).
*
* So, let's use statfs() if possible (it's bad idea for --lazy/--force
* umounts as target is probably unreachable NFS, also for --detach-loop
* as this additionally needs to know the name of the loop device).
*/
if (!mnt_context_is_restricted(cxt)
&& *tgt == '/'
&& !(cxt->flags & MNT_FL_HELPER)
&& !mnt_context_mtab_writable(cxt)
&& !mnt_context_is_force(cxt)
&& !mnt_context_is_lazy(cxt)
&& !mnt_context_is_loopdel(cxt)
&& mnt_stat_mountpoint(tgt, &st) == 0 && S_ISDIR(st.st_mode)
&& !has_utab_entry(cxt, tgt)) {
const char *type = mnt_fs_get_fstype(cxt->fs);
/* !mnt_context_mtab_writable(cxt) && has_utab_entry() verified that there
* is no stuff in utab, so disable all mtab/utab related actions */
mnt_context_disable_mtab(cxt, TRUE);
if (!type) {
struct statfs vfs;
if (statfs(tgt, &vfs) == 0)
type = mnt_statfs_get_fstype(&vfs);
if (type) {
rc = mnt_fs_set_fstype(cxt->fs, type);
if (rc)
return rc;
}
}
if (type) {
DBG(CXT, ul_debugobj(cxt,
"umount: mountinfo unnecessary [type=%s]", type));
return 0;
}
}
rc = mnt_context_find_umount_fs(cxt, tgt, &fs);
if (rc < 0)
return rc;
if (rc == 1 || !fs) {
DBG(CXT, ul_debugobj(cxt, "umount: cannot find '%s' in mtab", tgt));
return 0; /* this is correct! */
}
if (fs != cxt->fs) {
/* copy from mtab to our FS description
*/
mnt_fs_set_source(cxt->fs, NULL);
mnt_fs_set_target(cxt->fs, NULL);
if (!mnt_copy_fs(cxt->fs, fs)) {
DBG(CXT, ul_debugobj(cxt, "umount: failed to copy FS"));
return -errno;
}
DBG(CXT, ul_debugobj(cxt, "umount: mtab applied"));
}
cxt->flags |= MNT_FL_TAB_APPLIED;
return rc;
}
/**
* mnt_context_next_mount:
* @cxt: context
* @itr: iterator
* @fs: returns the current filesystem
* @mntrc: returns the return code from mnt_context_mount()
* @ignored: returns 1 for not matching and 2 for already mounted filesystems
*
* This function tries to mount the next filesystem from fstab (as returned by
* mnt_context_get_fstab()). See also mnt_context_set_fstab().
*
* You can filter out filesystems by:
* mnt_context_set_options_pattern() to simulate mount -a -O pattern
* mnt_context_set_fstype_pattern() to simulate mount -a -t pattern
*
* If the filesystem is already mounted or does not match defined criteria,
* then the mnt_context_next_mount() function returns zero, but the @ignored is
* non-zero. Note that the root filesystem and filesystems with "noauto" option
* are always ignored.
*
* If mount(2) syscall or mount.type helper failed, then the
* mnt_context_next_mount() function returns zero, but the @mntrc is non-zero.
* Use also mnt_context_get_status() to check if the filesystem was
* successfully mounted.
*
* Returns: 0 on success,
* <0 in case of error (!= mount(2) errors)
* 1 at the end of the list.
*/
int mnt_context_next_mount(struct libmnt_context *cxt,
struct libmnt_iter *itr,
struct libmnt_fs **fs,
int *mntrc,
int *ignored)
{
struct libmnt_table *fstab, *mtab;
const char *o, *tgt;
int rc, mounted = 0;
if (ignored)
*ignored = 0;
if (mntrc)
*mntrc = 0;
if (!cxt || !fs || !itr)
return -EINVAL;
mtab = cxt->mtab;
cxt->mtab = NULL; /* do not reset mtab */
mnt_reset_context(cxt);
cxt->mtab = mtab;
rc = mnt_context_get_fstab(cxt, &fstab);
if (rc)
return rc;
rc = mnt_table_next_fs(fstab, itr, fs);
if (rc != 0)
return rc; /* more filesystems (or error) */
o = mnt_fs_get_user_options(*fs);
tgt = mnt_fs_get_target(*fs);
DBG(CXT, mnt_debug_h(cxt, "next-mount: trying %s", tgt));
/* ignore swap */
if (mnt_fs_is_swaparea(*fs) ||
/* ignore root filesystem */
(tgt && (strcmp(tgt, "/") == 0 || strcmp(tgt, "root") == 0)) ||
/* ignore noauto filesystems */
(o && mnt_optstr_get_option(o, "noauto", NULL, NULL) == 0) ||
/* ignore filesystems not match with options patterns */
(cxt->fstype_pattern && !mnt_fs_match_fstype(*fs,
cxt->fstype_pattern)) ||
/* ignore filesystems not match with type patterns */
(cxt->optstr_pattern && !mnt_fs_match_options(*fs,
cxt->optstr_pattern))) {
if (ignored)
*ignored = 1;
DBG(CXT, mnt_debug_h(cxt, "next-mount: not-match "
"[fstype: %s, t-pattern: %s, options: %s, O-pattern: %s]",
mnt_fs_get_fstype(*fs),
cxt->fstype_pattern,
mnt_fs_get_options(*fs),
cxt->optstr_pattern));
return 0;
}
/* ignore already mounted filesystems */
rc = mnt_context_is_fs_mounted(cxt, *fs, &mounted);
if (rc)
return rc;
if (mounted) {
if (ignored)
*ignored = 2;
return 0;
}
if (mnt_context_is_fork(cxt)) {
rc = mnt_fork_context(cxt);
if (rc)
return rc; /* fork error */
if (mnt_context_is_parent(cxt)) {
return 0; /* parent */
}
}
/* child or non-forked */
rc = mnt_context_set_fs(cxt, *fs);
if (!rc) {
rc = mnt_context_mount(cxt);
if (mntrc)
*mntrc = rc;
}
if (mnt_context_is_child(cxt)) {
DBG(CXT, mnt_debug_h(cxt, "next-mount: child exit [rc=%d]", rc));
DBG_FLUSH;
exit(rc);
}
return 0;
}
/*
* The default is to use fstype from cxt->fs, this could be overwritten by
* @try_type argument.
*
* Returns: 0 on success,
* >0 in case of mount(2) error (returns syscall errno),
* <0 in case of other errors.
*/
static int do_mount(struct libmnt_context *cxt, const char *try_type)
{
int rc = 0;
const char *src, *target, *type;
unsigned long flags;
assert(cxt);
assert(cxt->fs);
assert((cxt->flags & MNT_FL_MOUNTFLAGS_MERGED));
if (try_type && !cxt->helper) {
rc = mnt_context_prepare_helper(cxt, "mount", try_type);
if (rc)
return rc;
}
if (cxt->helper)
return exec_helper(cxt);
flags = cxt->mountflags;
src = mnt_fs_get_srcpath(cxt->fs);
target = mnt_fs_get_target(cxt->fs);
if (!target)
return -EINVAL;
if (!src) {
/* unnecessary, should be already resolved in
* mnt_context_prepare_srcpath(), but for sure... */
DBG(CXT, mnt_debug_h(cxt, "WARNING: source is NULL -- using \"none\"!"));
src = "none";
}
type = try_type ? : mnt_fs_get_fstype(cxt->fs);
if (!(flags & MS_MGC_MSK))
flags |= MS_MGC_VAL;
DBG(CXT, mnt_debug_h(cxt, "%smount(2) "
"[source=%s, target=%s, type=%s, "
" mountflags=0x%08lx, mountdata=%s]",
mnt_context_is_fake(cxt) ? "(FAKE) " : "",
src, target, type,
flags, cxt->mountdata ? "yes" : "<none>"));
if (mnt_context_is_fake(cxt))
cxt->syscall_status = 0;
else {
if (mount(src, target, type, flags, cxt->mountdata)) {
cxt->syscall_status = -errno;
DBG(CXT, mnt_debug_h(cxt, "mount(2) failed [errno=%d %m]",
-cxt->syscall_status));
return -cxt->syscall_status;
}
DBG(CXT, mnt_debug_h(cxt, "mount(2) success"));
cxt->syscall_status = 0;
}
if (try_type && cxt->update) {
struct libmnt_fs *fs = mnt_update_get_fs(cxt->update);
if (fs)
rc = mnt_fs_set_fstype(fs, try_type);
}
return rc;
}
