07-23-2008
Ownership problem using a CIFS-mounted volume
Hello,
I am trying to use a storage service for backing large amounts
(terabytes) of data. The service uses Linux machines and allows
mounting of their disks using the CIFS/SMB protocol.
I do have the option of using rsync directly over the network
without mounting. But in order to automate this process, I do
want to have the remote disk mounted and be able to use cp or
rsync transparently.
The data that needs to be backed up is also on Linux systems. I had
our sys admin set things up on our system so that I can use mount.cifs
command to mount the remote disk like so:
$ mkdir -p /tmp/sam_test3
$ mount.cifs //brick.orgname.org/test3 /tmp/sam_test3 -o
user=test3, uid=sam, gid=swdevelopers, file_mode=0775,
dir_mode=0775
where the remote username (on brick) is 'test3' and my local username
is on our system is 'sam'. By the way, 'test3' is also a member of a
group with the same name 'test3'. That group has w/x permissions on
/tmp/sam_test3.
The mounting command above works fine: After entering my remote user
password, the disk is successfully mounted, but it changes owner and
gid to 'test3'.
The problem is to write to that mounted dir from my local machine on
which I'm logged in as 'sam'. Since I'm not the owner of
/tmp/sam_test3 and I don't belong to the group 'test3', I can't
write to it.
It would seem that the way to solve this would be to add my local
username, 'sam' to the group 'test3' on the remote machine. But this
is what the admin for the remote machine brick told me.
> I think that is going to be UID based, and not name based so adding
> the name will likely not help as the UID between machines is going to
> be different.
Is there anyone with in-depth knowledge of CIFS and the mount.cifs
command who can suggest a way around the ownership permissions
problems.
He also suggested that smbmount doesn't have the same problem.
(If that's true, why not?)
Thank you in advance to whomever can give me some suggestions,
Sam
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LEARN ABOUT LINUX
cifs.idmap
CIFS.IDMAP(8) System Administration tools CIFS.IDMAP(8)
NAME
cifs.idmap - Userspace helper for mapping ids for Common Internet File System (CIFS)
SYNOPSIS
cifs.idmap [--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 request-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.
cifs.idmap works in conjuction with winbind facility of Samba suite to map owner and group SIDs to uids and gids respectively. It is best
utilized when
- a mount option of cifsacl is specified when mounting a cifs share
- winbind is specified as one of the search entries for passwd and group databases in file /etc/nsswitch.conf
- file smb.conf has winbind specific entries
- winbind daemon program is running
In case winbind and cifs.idmap facilities are unavailable, file objects in a mounted share are assigned uid and gid of the credentials of
the process that mounted the share. So 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 respectively in case services of winbind and cifs.idmap facility are unavailable.
OPTIONS
--version|-v
Print version number and exit.
CONFIGURATION FOR KEYCTL
cifs.idmap is designed to be called from the kernel via the request-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 regarding these programs.
cifs-utils 05/26/2011 CIFS.IDMAP(8)