x SuSE Linux 13.1-RELEASE x
x SuSE Linux 13.1-RELEASEx
CIFS.IDMAP(8) CIFS.IDMAP(8)
NAME
cifs.idmap - Userspace helper for mapping ids for Common Internet File
System (CIFS)
SYNOPSIS
cifs.idmap [--help|-h] [--timeout|-t] [--version|-v] {keyid}
DESCRIPTION
This tool is part of the cifs-utils suite.
cifs.idmap is a userspace helper program for the linux CIFS client
filesystem. There are a number of activities that the kernel cannot
easily do itself. This program is a callout program that does these
things for the kernel and then returns the result.
cifs.idmap is generally intended to be run when the kernel calls re-
quest-key(8) for a particular key type. While it can be run directly
from the command-line, it is not generally intended to be run that way.
This program is only called if a share is mounted with the cifsacl
mount option. The kernel will only upcall to do this conversion if that
mount option is specified.
cifs.idmap relies on a plugin to handle the ID mapping. If it can't
find the plugin then it will not work properly. The plugin (or a sym-
link to it) must be at /etc/cifs-utils/idmap-plugin.
In the case where cifs.idmap or the plugin are unavailable, file ob-
jects in a mounted share are assigned uid and gid of the credentials of
the process that mounted the share. It is strongly recomemended to use
mount options of uid and gid to specify a default uid and gid to map
owner SIDs and group SIDs in this situation.
OPTIONS
--help|-h
Print the usage message and exit.
--timeout|-t
Set the expiration timer, in seconds on the key. The default is
600 seconds (10 minutes). Setting this to 0 will cause the key
to never expire.
--version|-v
Print version number and exit.
CONFIGURATION FOR KEYCTL
cifs.idmap is designed to be called from the kernel via the re-
quest-key callout program. This requires that request-key be told where
and how to call this program. Currently cifs.idmap handles a key type
of:
cifs.idmap
This keytype is for mapping a SID to either an uid or a gid.
To make this program useful for CIFS, you will need to set up entry for
it in request-key.conf(5). Here is an example of an entry for this key
type:
#OPERATION TYPE D C PROGRAM ARG1 ARG2...
#========= ============= = = ================================
create cifs.idmap * * /usr/sbin/cifs.idmap %k
See request-key.conf(5) for more info on each field.
NOTES
Support for upcalls to cifs.idmap was initially introduced in the 3.0
kernel.
SEE ALSO
request-key.conf(5), mount.cifs(8)
AUTHOR
Shirish Pargaonkar wrote the cifs.idmap program.
The Linux CIFS Mailing list is the preferred place to ask questions re-
garding these programs.
CIFS.IDMAP(8)
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