static int is_mounted(struct libmnt_fs *fs)
{
int rc;
const char *src;
src = mnt_fs_get_source(fs);
if (!src)
return 0;
if (!mntcache)
mntcache = mnt_new_cache();
if (!mtab) {
mtab = mnt_new_table();
if (!mtab)
err(FSCK_EX_ERROR, ("failed to initialize libmount table"));
mnt_table_set_cache(mtab, mntcache);
mnt_table_parse_mtab(mtab, NULL);
}
rc = mnt_table_find_source(mtab, src, MNT_ITER_BACKWARD) ? 1 : 0;
if (verbose) {
if (rc)
printf(_("%s is mounted\n"), src);
else
printf(_("%s is not mounted\n"), src);
}
return rc;
}
/**
* mnt_table_parse_mtab:
* @tb: table
* @filename: overwrites default (/etc/mtab or $LIBMOUNT_MTAB) or NULL
*
* This function parses /etc/mtab or /proc/self/mountinfo +
* /run/mount/utabs or /proc/mounts.
*
* See also mnt_table_set_parser_errcb().
*
* Returns: 0 on success or negative number in case of error.
*/
int mnt_table_parse_mtab(struct libmnt_table *tb, const char *filename)
{
int rc;
const char *utab = NULL;
struct libmnt_table *u_tb;
assert(tb);
if (mnt_has_regular_mtab(&filename, NULL)) {
DBG(TAB, mnt_debug_h(tb, "force %s usage", filename));
rc = mnt_table_parse_file(tb, filename);
if (!rc)
return 0;
filename = NULL; /* failed */
}
/*
* useless /etc/mtab
* -- read kernel information from /proc/self/mountinfo
*/
tb->fmt = MNT_FMT_MOUNTINFO;
rc = mnt_table_parse_file(tb, _PATH_PROC_MOUNTINFO);
if (rc) {
/* hmm, old kernel? ...try /proc/mounts */
tb->fmt = MNT_FMT_MTAB;
return mnt_table_parse_file(tb, _PATH_PROC_MOUNTS);
}
if (mnt_table_get_nents(tb) == 0)
return 0; /* empty, ignore utab */
/*
* try to read the user specific information from /run/mount/utabs
*/
utab = mnt_get_utab_path();
if (!utab || is_file_empty(utab))
return 0;
u_tb = mnt_new_table();
if (!u_tb)
return -ENOMEM;
u_tb->fmt = MNT_FMT_UTAB;
mnt_table_set_parser_fltrcb(u_tb, tb->fltrcb, tb->fltrcb_data);
if (mnt_table_parse_file(u_tb, utab) == 0) {
struct libmnt_fs *u_fs;
struct libmnt_iter itr;
mnt_reset_iter(&itr, MNT_ITER_BACKWARD);
/* merge user options into mountinfo from the kernel */
while(mnt_table_next_fs(u_tb, &itr, &u_fs) == 0)
mnt_table_merge_user_fs(tb, u_fs);
}
mnt_unref_table(u_tb);
return 0;
}
struct libmnt_table *get_swaps(void)
{
if (!swaps) {
swaps = mnt_new_table();
if (!swaps)
return NULL;
mnt_table_set_cache(swaps, mntcache);
if (mnt_table_parse_swaps(swaps, NULL) != 0)
return NULL;
}
return swaps;
}
struct libmnt_table *get_fstab(void)
{
if (!fstab) {
fstab = mnt_new_table();
if (!fstab)
return NULL;
mnt_table_set_cache(fstab, mntcache);
if (mnt_table_parse_fstab(fstab, NULL) != 0)
return NULL;
}
return fstab;
}
/**
* mnt_new_table_from_dir
* @dirname: directory with *.fstab files
*
* Returns: newly allocated tab on success and NULL in case of error.
*/
struct libmnt_table *mnt_new_table_from_dir(const char *dirname)
{
struct libmnt_table *tb;
if (!dirname)
return NULL;
tb = mnt_new_table();
if (tb && mnt_table_parse_dir(tb, dirname) != 0) {
mnt_unref_table(tb);
tb = NULL;
}
return tb;
}
/*
* 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;
}
struct libmnt_table *__mnt_new_table_from_file(const char *filename, int fmt)
{
struct libmnt_table *tb;
struct stat st;
assert(filename);
if (!filename)
return NULL;
if (stat(filename, &st))
return NULL;
tb = mnt_new_table();
if (tb) {
tb->fmt = fmt;
if (mnt_table_parse_file(tb, filename) != 0) {
mnt_unref_table(tb);
tb = NULL;
}
}
return tb;
}
struct libmnt_table *__mnt_new_table_from_file(const char *filename, int fmt)
{
struct libmnt_table *tb;
struct stat st;
if (!filename)
return NULL;
if (stat(filename, &st))
return NULL;
tb = mnt_new_table();
if (tb) {
DBG(TAB, ul_debugobj(tb, "new tab for file: %s", filename));
tb->fmt = fmt;
if (mnt_table_parse_file(tb, filename) != 0) {
mnt_unref_table(tb);
tb = NULL;
}
}
return tb;
}
/* Check if there is something important in the utab file. The parsed utab is
* stored in context->utab and deallocated by mnt_free_context().
*
* This function exists to avoid (if possible) /proc/self/mountinfo usage, so
* don't use thigs like mnt_resolve_target(), mnt_context_get_mtab() etc here.
* See lookup_umount_fs() for more details.
*/
static int has_utab_entry(struct libmnt_context *cxt, const char *target)
{
struct libmnt_cache *cache = NULL;
struct libmnt_fs *fs;
struct libmnt_iter itr;
char *cn = NULL;
int rc = 0;
assert(cxt);
if (!cxt->utab) {
const char *path = mnt_get_utab_path();
if (!path || is_file_empty(path))
return 0;
cxt->utab = mnt_new_table();
if (!cxt->utab)
return 0;
cxt->utab->fmt = MNT_FMT_UTAB;
if (mnt_table_parse_file(cxt->utab, path))
return 0;
}
/* paths in utab are canonicalized */
cache = mnt_context_get_cache(cxt);
cn = mnt_resolve_path(target, cache);
mnt_reset_iter(&itr, MNT_ITER_BACKWARD);
while (mnt_table_next_fs(cxt->utab, &itr, &fs) == 0) {
if (mnt_fs_streq_target(fs, cn)) {
rc = 1;
break;
}
}
if (!cache)
free(cn);
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) {
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;
}
void mount_points_list_free(MountPoint **head) {
assert(head);
while (*head)
mount_point_free(head, *head);
}
int mount_points_list_get(const char *mountinfo, MountPoint **head) {
_cleanup_(mnt_free_tablep) struct libmnt_table *t = NULL;
_cleanup_(mnt_free_iterp) struct libmnt_iter *i = NULL;
int r;
assert(head);
t = mnt_new_table();
i = mnt_new_iter(MNT_ITER_FORWARD);
if (!t || !i)
return log_oom();
r = mnt_table_parse_mtab(t, mountinfo);
if (r < 0)
return log_error_errno(r, "Failed to parse %s: %m", mountinfo);
for (;;) {
struct libmnt_fs *fs;
const char *path, *options, *fstype;
_cleanup_free_ char *p = NULL;
unsigned long remount_flags = 0u;
_cleanup_free_ char *remount_options = NULL;
bool try_remount_ro;
/* default filename is /proc/self/mountinfo
*/
int __mnt_table_parse_mtab(struct libmnt_table *tb, const char *filename,
struct libmnt_table *u_tb)
{
int rc = 0, priv_utab = 0;
assert(tb);
if (filename)
DBG(TAB, ul_debugobj(tb, "%s reuested as mtab", filename));
#ifdef USE_LIBMOUNT_SUPPORT_MTAB
if (mnt_has_regular_mtab(&filename, NULL)) {
DBG(TAB, ul_debugobj(tb, "force mtab usage [filename=%s]", filename));
rc = mnt_table_parse_file(tb, filename);
/*
* If @filename forces us to read from /proc then also read
* utab file to merge userspace mount options.
*/
if (rc == 0 && is_mountinfo(tb))
goto read_utab;
if (!rc)
return 0;
filename = NULL; /* failed */
} else
filename = NULL; /* mtab useless */
#endif
if (!filename || strcmp(filename, _PATH_PROC_MOUNTINFO) == 0) {
filename = _PATH_PROC_MOUNTINFO;
tb->fmt = MNT_FMT_MOUNTINFO;
DBG(TAB, ul_debugobj(tb, "mtab parse: #1 read mountinfo"));
} else
tb->fmt = MNT_FMT_GUESS;
rc = mnt_table_parse_file(tb, filename);
if (rc) {
/* hmm, old kernel? ...try /proc/mounts */
tb->fmt = MNT_FMT_MTAB;
return mnt_table_parse_file(tb, _PATH_PROC_MOUNTS);
}
if (!is_mountinfo(tb))
return 0;
#ifdef USE_LIBMOUNT_SUPPORT_MTAB
read_utab:
#endif
DBG(TAB, ul_debugobj(tb, "mtab parse: #2 read utab"));
if (mnt_table_get_nents(tb) == 0)
return 0; /* empty, ignore utab */
/*
* try to read the user specific information from /run/mount/utabs
*/
if (!u_tb) {
const char *utab = mnt_get_utab_path();
if (!utab || is_file_empty(utab))
return 0;
u_tb = mnt_new_table();
if (!u_tb)
return -ENOMEM;
u_tb->fmt = MNT_FMT_UTAB;
mnt_table_set_parser_fltrcb(u_tb, tb->fltrcb, tb->fltrcb_data);
rc = mnt_table_parse_file(u_tb, utab);
priv_utab = 1;
}
DBG(TAB, ul_debugobj(tb, "mtab parse: #3 merge utab"));
if (rc == 0) {
struct libmnt_fs *u_fs;
struct libmnt_iter itr;
mnt_reset_iter(&itr, MNT_ITER_BACKWARD);
/* merge user options into mountinfo from the kernel */
while(mnt_table_next_fs(u_tb, &itr, &u_fs) == 0)
mnt_table_merge_user_fs(tb, u_fs);
}
if (priv_utab)
mnt_unref_table(u_tb);
return 0;
}