cifs.idmap(8)

1CIFS.IDMAP(8)             System Administration tools            CIFS.IDMAP(8)
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NAME

6       cifs.idmap - Userspace helper for mapping ids for Common Internet File
7       System (CIFS)
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SYNOPSIS

10       cifs.idmap [--help|-h] [--timeout|-t] [--version|-v] {keyid}
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DESCRIPTION

13       This tool is part of the cifs-utils suite.
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15       cifs.idmap is a userspace helper program for the linux CIFS client
16       filesystem. There are a number of activities that the kernel cannot
17       easily do itself. This program is a callout program that does these
18       things for the kernel and then returns the result.
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20       cifs.idmap is generally intended to be run when the kernel calls
21       request-key(8) for a particular key type. While it can be run directly
22       from the command-line, it is not generally intended to be run that way.
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24       This program is only called if a share is mounted with the cifsacl
25       mount option. The kernel will only upcall to do this conversion if that
26       mount option is specified.
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28       cifs.idmap relies on a plugin to handle the ID mapping. If it can't
29       find the plugin then it will not work properly. The plugin (or a
30       symlink to it) must be at /etc/cifs-utils/idmap-plugin.
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32       In the case where cifs.idmap or the plugin are unavailable, file
33       objects in a mounted share are assigned uid and gid of the credentials
34       of the process that mounted the share. It is strongly recomemended to
35       use mount options of uid and gid to specify a default uid and gid to
36       map owner SIDs and group SIDs in this situation.
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OPTIONS

39       --help|-h
40              Print the usage message and exit.
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42       --timeout|-t
43           Set the expiration timer, in seconds on the key. The default is 600
44           seconds (10 minutes). Setting this to 0 will cause the key to never
45           expire.
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47       --version|-v
48           Print version number and exit.
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CONFIGURATION FOR KEYCTL

51       cifs.idmap is designed to be called from the kernel via the request-key
52       callout program. This requires that request-key be told where and how
53       to call this program. Currently cifs.idmap handles a key type of:
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55       cifs.idmap
56           This keytype is for mapping a SID to either an uid or a gid
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58       To make this program useful for CIFS, you will need to set up entry for
59       it in request-key.conf(5). Here is an example of an entry for this key
60       type:
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62           #OPERATION  TYPE           D C PROGRAM ARG1 ARG2...
63           #=========  =============  = = ================================
64           create      cifs.idmap     * * /usr/sbin/cifs.idmap %k
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66       See request-key.conf(5) for more info on each field.
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NOTES

69       Support for upcalls to cifs.idmap was initially introduced in the 3.0
70       kernel.
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AUTHOR

76       Shirish Pargaonkar wrote the cifs.idmap program.
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78       The Linux CIFS Mailing list is the preferred place to ask questions
79       regarding these programs.
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83cifs-utils                        05/26/2011                     CIFS.IDMAP(8)