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Old 11-26-2003, 11:35 PM   #1
Registered: Jul 2003
Location: bangalore . india
Distribution: openSUSE 10.3
Posts: 251

Rep: Reputation: 33
file owner on an NFS

I would like to know if there is a way of specifying which user should be the owner of a file on an NFS that has write permissions for some other user.
I am asking this because :
when i touch a file on an NFS, it is created with the owner uid different from the real uid.

now the interesting thing that this causes is : when i try to change the timestamp on this file, it disallows the operation saying that i am not the owner of the file(fair enough,that does show when i do an ls -l, and the utime man page quite explicitly says this perm denied will happen if i am notthe owner of the file, even though i might have write perms in the directory )

but my question is why is this done?

i am not on linux, hence the general forum.

i understand that linux has a call setfsuid(2) to set the user id as an owner of a file on an NFS, is there anything similar available on any other *nix?

Last edited by shishir; 11-26-2003 at 11:38 PM.
Old 11-28-2003, 09:53 AM   #2
Registered: Dec 2002
Location: Au
Distribution: Debian
Posts: 209

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check the exports man page it's explained under User ID Mapping section.
Old 11-28-2003, 05:18 PM   #3
Registered: Sep 2002
Location: lahore pakistan
Distribution: slackware,redhat, FreeBSD,openbsd
Posts: 219

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in practical environment NFS and NIS work together to avoid such things.

anyway i think its not a place to ask this question.
Old 11-28-2003, 05:53 PM   #4
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...moved to the Linux - Networking forum
Old 11-30-2003, 11:09 PM   #5
Registered: Jul 2003
Location: bangalore . india
Distribution: openSUSE 10.3
Posts: 251

Original Poster
Rep: Reputation: 33
thanks for putting the post at the right place...
and thanks for the inputs.

i have found out the reason for the problem i was facing,
seems there was some limitation in the implementation on the *nix
i am using. i dug into it and found that it was to be fixed in future releases.

thanks for the inputs.


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