mnt_optstr_append_option ()

int
mnt_optstr_append_option (char **optstr,
                          const char *name,
                          const char *value);

mnt_optstr_apply_flags ()

int
mnt_optstr_apply_flags (char **optstr,
                        unsigned long  flags,
                        const struct libmnt_optmap *map);

Removes/adds options to the optstr according to flags. For example:

MS_NOATIME and "foo,bar,noexec" --returns-> "foo,bar,noatime"

mnt_optstr_deduplicate_option ()

int
mnt_optstr_deduplicate_option (char **optstr,
                               const char *name);

Removes all instances of name except the last one.

mnt_optstr_get_flags ()

int
mnt_optstr_get_flags (const char *optstr,
                      unsigned long *flags,
                      const struct libmnt_optmap *map);

Returns in flags IDs of options from optstr as defined in the map .

For example:

"bind,exec,foo,bar" --returns-> MS_BIND

"bind,noexec,foo,bar" --returns-> MS_BIND|MS_NOEXEC

Note that flags are not zeroized by this function! This function sets/unsets bits in the flags only.

mnt_optstr_get_option ()

int
mnt_optstr_get_option (const char *optstr,
                       const char *name,
                       char **value,
                       size_t *valsz);

mnt_optstr_get_options ()

int
mnt_optstr_get_options (const char *optstr,
                        char **subset,
                        const struct libmnt_optmap *map,
                        int ignore);

Extracts options from optstr that belong to the map , for example:

mnt_optstr_get_options(optstr, &p, mnt_get_builtin_optmap(MNT_LINUX_MAP), MNT_NOMTAB);

the 'p' returns all VFS options, the options that do not belong to mtab are ignored.

mnt_optstr_next_option ()

int
mnt_optstr_next_option (char **optstr,
                        char **name,
                        size_t *namesz,
                        char **value,
                        size_t *valuesz);

Parses the first option in optstr .

mnt_optstr_prepend_option ()

int
mnt_optstr_prepend_option (char **optstr,
                           const char *name,
                           const char *value);

mnt_optstr_remove_option ()

int
mnt_optstr_remove_option (char **optstr,
                          const char *name);

mnt_optstr_set_option ()

int
mnt_optstr_set_option (char **optstr,
                       const char *name,
                       const char *value);

Set or unset the option value .

mnt_split_optstr ()

int
mnt_split_optstr (const char *optstr,
                  char **user,
                  char **vfs,
                  char **fs,
                  int ignore_user,
                  int ignore_vfs);

For example:

mnt_split_optstr(optstr, &u, NULL, NULL, MNT_NOMTAB, 0);

returns all userspace options, the options that do not belong to mtab are ignored.

Note that FS options are all options that are undefined in MNT_USERSPACE_MAP or MNT_LINUX_MAP.

mnt_match_options ()

int
mnt_match_options (const char *optstr,
                   const char *pattern);

The "no" could be used for individual items in the options list. The "no" prefix does not have a global meaning.

Unlike fs type matching, nonetdev,user and nonetdev,nouser have DIFFERENT meanings; each option is matched explicitly as specified.

The "no" prefix interpretation could be disabled by the "+" prefix, for example "+noauto" matches if optstr literally contains the "noauto" string.

The alone "no" is error and all matching ends with False.

"xxx,yyy,zzz" : "nozzz" -> False

"xxx,yyy,zzz" : "xxx,noeee" -> True

"bar,zzz" : "nofoo" -> True (does not contain "foo")

"nofoo,bar" : "nofoo" -> True (does not contain "foo")

"nofoo,bar" : "+nofoo" -> True (contains "nofoo")

"bar,zzz" : "+nofoo" -> False (does not contain "nofoo")

"bar,zzz" : "" or "+" -> True (empty pattern is matching)

"" : "" -> True

"" : "foo" -> False

"" : "nofoo" -> True

"" : "no,foo" -> False (alone "no" is error)

"no" : "+no" -> True ("no" is an option due to "+")