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UMOUNT.CIFS(8) UMOUNT.CIFS(8)
NAME
umount.cifs - for normal, non-root users, to unmount their own Common
Internet File System (CIFS) mounts
SYNOPSIS
umount.cifs {mount-point} [-nVvhfle]
DESCRIPTION
This tool is part of the samba(7) suite.
umount.cifs unmounts a Linux CIFS filesystem. It can be invoked indi-
rectly by the umount(8) command when umount.cifs is in /sbin directory,
unless you specify the "-i" option to umount. Specifying -i to umount
avoids execution of umount helpers such as umount.cifs. The umount.cifs
command only works in Linux, and the kernel must support the cifs
filesystem. The CIFS protocol is the successor to the SMB protocol and
is supported by most Windows servers and many other commercial servers
and Network Attached Storage appliances as well as by the popular Open
Source server Samba.
The umount.cifs utility detaches the local directory mount-point from
the corresponding UNC name (exported network resource) and frees the
associated kernel resources. It is possible to set the mode for
umount.cifs to setuid root (or equivalently update the /etc/permissions
file) to allow non-root users to umount shares to directories for which
they have write permission. The umount.cifs utility is typically not
needed if unmounts need only be performed by root users, or if user
mounts and unmounts can rely on specifying explicit entries in
/etc/fstab See
fstab(5)
OPTIONS
--verbose
print additional debugging information
--no-mtab
Do not update the mtab even if unmount completes successfully
(/proc/mounts will still display the correct information)
NOTES
This command is normally intended to be installed setuid (since root
users can already run unmount). An alternative to using umount.cifs is
to add specfic entries for the user mounts that you wish a particular
user or users to mount and unmount to /etc/fstab
CONFIGURATION
The primary mechanism for making configuration changes and for reading
debug information for the cifs vfs is via the Linux /proc filesystem.
In the directory /proc/fs/cifs are various configuration files and
pseudo files which can display debug information. For more information
see the kernel file fs/cifs/README.
BUGS
At this time umount.cifs does not lock the mount table using the same
lock as the umount utility does, so do not attempt to do multiple un-
mounts from different processes (and in particular unmounts of a cifs
mount and another type of filesystem mount at the same time).
If the same mount point is mounted multiple times by cifs, umount.cifs
will remove all of the matching entries from the mount table (although
umount.cifs will actually only unmount the last one), rather than only
removing the last matching entry in /etc/mtab. The pseudofile
/proc/mounts will display correct information though, and the lack of
an entry in /etc/mtab does not prevent subsequent unmounts.
Note that the typical response to a bug report is a suggestion to try
the latest version first. So please try doing that first, and always
include which versions you use of relevant software when reporting bugs
(minimum: umount.cifs (try umount.cifs -V), kernel (see /proc/version)
and server type you are trying to contact.
VERSION
This man page is correct for version 1.34 of the cifs vfs filesystem
(roughly Linux kernel 2.6.12).
SEE ALSO
Documentation/filesystems/cifs.txt and fs/cifs/README in the linux ker-
nel source tree may contain additional options and information.
mount.cifs(8)
AUTHOR
Steve French
The syntax was loosely based on the umount utility and the manpage was
loosely based on that of mount.cifs.8. The man page was created by
Steve French
The maintainer of the Linux cifs vfs and the userspace tool umount.cifs
is Steve French. The Linux CIFS Mailing list is the preferred place to
ask questions regarding these programs.
UMOUNT.CIFS(8)
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This page was generated on Tue Feb 13 02:23:08 GMT 2007
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