umount(2)                     System Calls Manual                    umount(2)

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       umount, umount2 - <?><?><?><?><?><?><?><?><?><?><?><?>
       <?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?>

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       Standard C library (libc, -lc)

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       #include <sys/mount.h>

       int umount(const char *target);
       int umount2(const char *target, int flags);

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       <?><?><?><?><?><?> umount() <?> umount2() <?><?><?><?><?><?><?>
       <?><?><?><?><?><?><?><?><?><?><?> (<?><?><?><?><?><?>
       <?><?><?><?><?><?><?><?> <?><?><?><?><?><?>) <?>
       <?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?>,
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?> <?> target.

       <?><?><?> <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>
       <?><?><?><?><?><?><?><?> <?><?><?><?><?><?> <?><?><?><?><?><?><?><?><?>
       <?><?><?><?><?> (Linux: <?><?><?><?><?><?> CAP_SYS_ADMIN).

       <?> Linux 2.1.116 <?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?><?>
       <?><?><?><?><?> umount2(), <?><?><?><?><?><?><?>, <?><?><?><?><?><?><?>
       umount(), <?><?><?><?><?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?>
       <?><?><?><?><?><?>, <?><?> <?><?><?><?><?><?><?><?><?>
       <?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?><?><?><?><?><?><?>
       <?><?><?><?><?> flags, <?><?><?><?><?><?><?><?><?><?><?><?><?><?>
       <?><?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?>:

       MNT_FORCE (<?><?><?><?><?><?><?> <?> Linux 2.1.116)
              <?><?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?>
              <?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?>
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              <?><?><?><?><?> <?><?><?><?><?><?><?><?>
              <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>. <?><?><?>
              <?><?><?><?><?> <?><?><?><?><?><?><?><?><?>
              <?><?><?><?><?><?><?><?><?>
              <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?> <?><?><?>
              <?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?><?><?><?><?>
              <?><?><?><?><?><?><?>, <?><?> <?><?><?><?><?>
              <?><?><?><?><?><?><?><?> <?> <?><?><?><?><?><?>
              <?><?><?><?><?><?>. <?><?><?><?> <?><?><?><?><?>
              <?><?><?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?>
              <?><?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?>
              <?><?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?><?><?> <?>
              <?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?>,
              <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?> <?><?>
              <?><?><?><?><?> <?><?><?><?><?><?><?><?><?>. <?> Linux 4.12
              MNT_FORCE <?><?><?><?><?><?><?><?><?><?><?><?><?><?>
              <?><?><?><?><?><?> <?> <?><?><?><?><?><?><?><?><?>
              <?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?>: 9p
              (<?><?><?><?><?><?><?> <?> Linux 2.6.16), ceph
              (<?><?><?><?><?><?><?> <?> Linux 2.6.34), cifs
              (<?><?><?><?><?><?><?> <?> Linux 2.6.12), fuse
              (<?><?><?><?><?><?><?> <?> Linux 2.6.16), lustre
              (<?><?><?><?><?><?><?> <?> Linux 3.11) <?> NFS
              (<?><?><?><?><?><?><?> <?> Linux 2.1.116).

       MNT_DETACH (<?><?><?><?><?><?><?> <?> Linux 2.4.11)
              Perform a lazy unmount: make the mount unavailable for new
              accesses, immediately disconnect the filesystem and all
              filesystems mounted below it from each other and from the mount
              table, and actually perform the unmount when the mount ceases to
              be busy.

       MNT_EXPIRE (<?><?><?><?><?><?><?> Linux 2.6.8)
              Mark the mount as expired.  If a mount is not currently in use,
              then an initial call to umount2()  with this flag fails with the
              error EAGAIN, but marks the mount as expired.  The mount remains
              expired as long as it isn't accessed by any process.  A second
              umount2()  call specifying MNT_EXPIRE unmounts an expired mount.
              This flag cannot be specified with either MNT_FORCE or
              MNT_DETACH.

       UMOUNT_NOFOLLOW (<?><?><?><?><?><?><?> <?> Linux 2.6.34)
              <?><?> <?><?><?><?><?><?><?><?><?> <?><?> <?><?><?><?><?><?>,
              <?><?><?><?> target <?><?><?><?><?><?><?><?>
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              <?><?><?><?><?><?><?><?><?><?><?><?><?> <?><?><?><?><?>
              set-user-ID, <?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?><?>
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              <?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?>.

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       <?><?><?><?><?><?><?><?><?><?><?><?> 0. <?><?><?> <?><?><?><?><?><?>
       <?><?><?><?><?><?><?><?><?><?><?><?> -1, <?> <?> errno
       <?><?><?><?><?><?><?><?><?><?> <?><?><?> <?><?><?><?><?><?>.

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       <?><?><?><?> <?><?><?><?><?><?>, <?><?><?><?><?><?><?><?><?>
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       <?><?><?><?><?><?><?><?><?>. <?><?><?><?><?><?><?><?><?><?><?>
       <?><?><?><?><?><?><?><?> <?> <?><?><?><?><?><?><?><?> <?><?><?><?>
       <?><?><?><?> Linux.

       EAGAIN <?><?><?><?><?> umount2() <?> <?><?><?><?><?><?> MNT_EXPIRE
              <?><?><?><?><?><?><?> <?><?><?><?><?><?><?>
              <?><?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?>
              <?><?><?><?><?><?><?> <?><?><?>
              <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>.

       EBUSY  <?><?><?><?><?><?> target <?><?> <?><?><?><?><?> <?><?><?><?>
              <?><?><?><?><?><?><?><?><?><?><?><?><?>, <?><?><?> <?><?><?>
              <?><?> <?><?><?><?><?>.

       EFAULT <?><?><?><?><?><?> target <?><?><?><?><?><?><?><?><?> <?><?><?>
              <?><?><?><?><?><?><?><?><?>
              <?><?><?><?><?><?><?><?><?><?><?><?>,
              <?><?><?><?><?><?><?><?><?><?>
              <?><?><?><?><?><?><?><?><?><?><?><?>.

       EINVAL <?><?><?><?><?><?><?><?> target <?><?> <?><?><?><?><?><?><?><?>
              <?><?><?><?><?><?> <?><?><?><?><?><?><?><?><?><?><?><?>.

       EINVAL target is locked; see mount_namespaces(7).

       EINVAL <?><?><?><?><?> umount2() <?><?><?> <?><?><?><?><?><?> <?>
              <?><?><?><?><?><?> MNT_EXPIRE <?> <?> MNT_DETACH <?><?><?>
              MNT_FORCE.

       EINVAL (<?><?><?><?><?><?><?> <?> Linux 2.6.34)
              <?><?><?><?><?> umount2() <?><?><?> <?><?><?><?><?><?> <?>
              <?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?><?>
              <?><?><?><?><?> flags.

       ENAMETOOLONG
              <?><?><?><?><?><?><?><?> <?><?><?><?> <?><?><?><?><?><?><?>
              <?><?><?> MAXPATHLEN.

       ENOENT <?><?><?><?><?><?> <?><?><?><?><?><?> <?><?><?><?> <?><?><?>
              <?><?><?><?> <?><?> <?><?><?> <?><?><?><?><?><?> <?><?>
              <?><?><?><?><?><?><?><?><?><?>.

       ENOMEM <?><?><?><?> <?><?> <?><?><?><?><?> <?><?><?><?><?><?><?><?>
              <?><?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?> <?><?><?>
              <?><?><?><?><?><?><?><?><?><?><?> <?><?><?><?><?>
              <?><?><?><?><?> <?><?><?> <?><?><?><?><?><?>.

       EPERM  <?><?><?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?> <?><?>
              <?><?><?><?><?> <?><?><?><?><?><?><?><?><?>
              <?><?><?><?><?><?><?><?><?><?>.

<?><?><?><?><?><?><?><?><?>
       Linux.

<?><?><?><?><?><?><?>
       MNT_DETACH and MNT_EXPIRE are available since glibc 2.11.

       <?><?><?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?> umount()
       <?><?><?><?><?><?><?><?><?><?> <?><?><?> umount(device) <?>
       <?><?><?><?><?><?><?><?><?><?> ENOTBLK <?><?><?> <?><?><?><?><?><?><?>
       <?><?><?><?><?><?> <?> <?><?><?><?><?> <?><?> <?><?><?><?><?><?><?>
       <?><?><?><?><?><?><?><?><?><?><?>. <?> Linux 0.98p4 <?><?><?>
       <?><?><?><?><?><?><?><?> <?><?><?><?><?> umount(dir) <?><?><?>
       <?><?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?><?>
       <?><?><?><?><?><?><?><?><?>. <?> Linux 2.3.99-pre7 <?><?><?>
       <?><?><?><?><?> <?><?><?><?><?> umount(device), <?><?><?><?><?><?><?>
       <?><?><?><?><?><?> umount(dir) (<?><?><?><?><?><?>
       <?><?><?><?><?><?><?><?><?><?> <?><?><?><?><?> <?><?><?><?>
       <?><?><?><?><?><?><?><?><?><?> <?><?><?><?><?> <?><?><?> <?>
       <?><?><?><?><?> <?><?><?><?><?>, <?><?><?><?><?><?><?>
       <?><?><?><?><?><?><?><?> <?><?><?><?><?><?>
       <?><?><?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?><?><?><?><?>).

<?><?><?><?><?><?><?><?><?><?>
   umount() and shared mounts
       Shared mounts cause any mount activity on a mount, including umount()
       operations, to be forwarded to every shared mount in the peer group and
       every slave mount of that peer group.  This means that umount()  of any
       peer in a set of shared mounts will cause all of its peers to be
       unmounted and all of their slaves to be unmounted as well.

       This propagation of unmount activity can be particularly surprising on
       systems where every mount is shared by default.  On such systems,
       recursively bind mounting the root directory of the filesystem onto a
       subdirectory and then later unmounting that subdirectory with
       MNT_DETACH will cause every mount in the mount namespace to be lazily
       unmounted.

       To ensure umount()  does not propagate in this fashion, the mount may
       be remounted using a mount(2)  call with a mount_flags argument that
       includes both MS_REC and MS_PRIVATE prior to umount()  being called.

<?><?><?><?><?><?><?><?> <?><?><?><?><?>
       mount(2), mount_namespaces(7), path_resolution(7), mount(8), umount(8)

<?><?><?><?><?><?><?>
       <?><?><?><?><?><?><?> <?><?><?><?><?><?><?> <?><?><?><?>
       <?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?><?><?><?>
       <?><?><?><?><?><?><?><?><?><?>(<?>) Azamat Hackimov
       <azamat.hackimov@gmail.com>, Dmitriy Ovchinnikov
       <dmitriyxt5@gmail.com>, Dmitry Bolkhovskikh <d20052005@yandex.ru>,
       Katrin Kutepova <blackkatelv@gmail.com>, Yuri Kozlov
       <yuray@komyakino.ru>, <?><?><?><?> <?><?><?><?><?><?>
       <pavia00@gmail.com> <?> Kirill Rekhov <krekhov.dev@gmail.com>

       <?><?><?><?> <?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?>
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       <?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?><?><?><?><?><?>
       <?><?><?><?><?><?><?><?> GNU (GNU General Public License - GPL,
       <https://www.gnu.org/licenses/gpl-3.0.html> <?><?><?><?><?><?> 3
       <?><?><?> <?><?><?><?><?> <?><?><?><?><?><?><?>) <?>
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       <?><?><?><?><?>, <?><?> <?><?><?> <?><?><?><?><?>-<?><?><?><?>
       <?><?><?><?><?><?><?><?>.

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       <?><?><?><?><?><?>(<?><?>) <?><?><?><?><?><?><?><?><?><?><?>
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       <?><?><?><?><?><?><?><?><?><?><?><?>
       <<debian-l10n-russian@lists.debian.org>>.

Linux man-pages 6.12       23 <?><?><?><?> 2024 <?>.                 umount(2)