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* Copyright (C) 2010 Karel Zak <kzak@redhat.com>
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* This file may be redistributed under the terms of the
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* GNU Lesser General Public License.
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* @short_description: description for mount options
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* The mount(2) linux syscall uses two arguments for mount options:
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* @mountflags: (see MS_* macros in linux/fs.h)
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* @mountdata: (usully a comma separated string of options)
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* The libmount uses options-map(s) to describe mount options.
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* The option description (map entry) includes:
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* @name: and argument name
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* @id: (in the map unique identifier or a mountflags, e.g MS_RDONLY)
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* @mask: (MNT_INVERT, MNT_NOMTAB)
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* The option argument value is defined by:
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* "=" -- required argument, e.g "comment="
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* "[=]" -- optional argument, e.g. "loop[=]"
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* #define MY_MS_FOO (1 << 1)
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* #define MY_MS_BAR (1 << 2)
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* libmnt_optmap myoptions[] = {
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* { "foo", MY_MS_FOO },
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* { "nofoo", MY_MS_FOO | MNT_INVERT },
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* { "bar=", MY_MS_BAR },
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* The libmount defines two basic built-in options maps:
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* @MNT_LINUX_MAP: fs-independent kernel mount options (usually MS_* flags)
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* @MNT_USERSPACE_MAP: userspace specific mount options (e.g. "user", "loop")
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* For more details about option map struct see "struct mnt_optmap" in
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* fs-independent mount flags (built-in MNT_LINUX_MAP)
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static const struct libmnt_optmap linux_flags_map[] =
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{ "ro", MS_RDONLY }, /* read-only */
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{ "rw", MS_RDONLY, MNT_INVERT }, /* read-write */
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{ "exec", MS_NOEXEC, MNT_INVERT }, /* permit execution of binaries */
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{ "noexec", MS_NOEXEC }, /* don't execute binaries */
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{ "suid", MS_NOSUID, MNT_INVERT }, /* honor suid executables */
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{ "nosuid", MS_NOSUID }, /* don't honor suid executables */
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{ "dev", MS_NODEV, MNT_INVERT }, /* interpret device files */
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{ "nodev", MS_NODEV }, /* don't interpret devices */
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{ "sync", MS_SYNCHRONOUS }, /* synchronous I/O */
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{ "async", MS_SYNCHRONOUS, MNT_INVERT },/* asynchronous I/O */
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{ "dirsync", MS_DIRSYNC }, /* synchronous directory modifications */
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{ "remount", MS_REMOUNT, MNT_NOMTAB }, /* alter flags of mounted FS */
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{ "bind", MS_BIND }, /* Remount part of tree elsewhere */
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{ "rbind", MS_BIND | MS_REC }, /* Idem, plus mounted subtrees */
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{ "sub", MS_NOSUB, MNT_INVERT }, /* allow submounts */
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{ "nosub", MS_NOSUB }, /* don't allow submounts */
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{ "quiet", MS_SILENT }, /* be quiet */
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{ "loud", MS_SILENT, MNT_INVERT }, /* print out messages. */
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{ "mand", MS_MANDLOCK }, /* Allow mandatory locks on this FS */
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{ "nomand", MS_MANDLOCK, MNT_INVERT }, /* Forbid mandatory locks on this FS */
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{ "atime", MS_NOATIME, MNT_INVERT }, /* Update access time */
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{ "noatime", MS_NOATIME }, /* Do not update access time */
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{ "iversion", MS_I_VERSION }, /* Update inode I_version time */
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{ "noiversion", MS_I_VERSION, MNT_INVERT},/* Don't update inode I_version time */
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{ "diratime", MS_NODIRATIME, MNT_INVERT }, /* Update dir access times */
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{ "nodiratime", MS_NODIRATIME }, /* Do not update dir access times */
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{ "relatime", MS_RELATIME }, /* Update access times relative to mtime/ctime */
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{ "norelatime", MS_RELATIME, MNT_INVERT }, /* Update access time without regard to mtime/ctime */
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#ifdef MS_STRICTATIME
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{ "strictatime", MS_STRICTATIME }, /* Strict atime semantics */
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{ "nostrictatime", MS_STRICTATIME, MNT_INVERT }, /* kernel default atime */
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* userspace mount option (built-in MNT_USERSPACE_MAP)
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* TODO: offset=, sizelimit=, encryption=, vfs=
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static const struct libmnt_optmap userspace_opts_map[] =
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{ "defaults", 0, 0 }, /* default options */
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{ "auto", MNT_MS_NOAUTO, MNT_INVERT | MNT_NOMTAB }, /* Can be mounted using -a */
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{ "noauto", MNT_MS_NOAUTO, MNT_NOMTAB }, /* Can only be mounted explicitly */
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{ "user[=]", MNT_MS_USER }, /* Allow ordinary user to mount (mtab) */
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{ "nouser", MNT_MS_USER, MNT_INVERT | MNT_NOMTAB }, /* Forbid ordinary user to mount */
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{ "users", MNT_MS_USERS, MNT_NOMTAB }, /* Allow ordinary users to mount */
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{ "nousers", MNT_MS_USERS, MNT_INVERT | MNT_NOMTAB }, /* Forbid ordinary users to mount */
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{ "owner", MNT_MS_OWNER, MNT_NOMTAB }, /* Let the owner of the device mount */
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{ "noowner", MNT_MS_OWNER, MNT_INVERT | MNT_NOMTAB }, /* Device owner has no special privs */
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{ "group", MNT_MS_GROUP, MNT_NOMTAB }, /* Let the group of the device mount */
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{ "nogroup", MNT_MS_GROUP, MNT_INVERT | MNT_NOMTAB }, /* Device group has no special privs */
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{ "_netdev", MNT_MS_NETDEV }, /* Device requires network */
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{ "comment=", MNT_MS_COMMENT, MNT_NOMTAB }, /* fstab comment only */
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{ "loop[=]", MNT_MS_LOOP }, /* use the loop device */
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{ "nofail", MNT_MS_NOFAIL, MNT_NOMTAB }, /* Do not fail if ENOENT on dev */
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{ "uhelper=", MNT_MS_UHELPER }, /* /sbin/umount.<helper> */
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* mnt_get_builtin_map:
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* @id: map id -- MNT_LINUX_MAP or MNT_USERSPACE_MAP
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* MNT_LINUX_MAP - Linux kernel fs-independent mount options
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* (usually MS_* flags, see linux/fs.h)
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* MNT_USERSPACE_MAP - userpace mount(8) specific mount options
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* (e.g user=, _netdev, ...)
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* Returns: static built-in libmount map.
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const struct libmnt_optmap *mnt_get_builtin_optmap(int id)
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if (id == MNT_LINUX_MAP)
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return linux_flags_map;
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else if (id == MNT_USERSPACE_MAP)
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return userspace_opts_map;
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* Lookups for the @name in @maps and returns a map and in @mapent
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* returns the map entry
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const struct libmnt_optmap *mnt_optmap_get_entry(
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struct libmnt_optmap const **maps,
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const struct libmnt_optmap **mapent)
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for (i = 0; i < nmaps; i++) {
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const struct libmnt_optmap *map = maps[i];
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const struct libmnt_optmap *ent;
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for (ent = map; ent && ent->name; ent++) {
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if (strncmp(ent->name, name, namelen))
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p = ent->name + namelen;
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if (*p == '\0' || *p == '=' || *p == '[') {
added
removed
shlibs/mount/src/optmap.c
