meaning of "owner" option for mount
doug reeder
It shows up on entries for removeable media in my fstab, but
is not mentioned in the man pages.
--
P. Douglas Reeder Lecturer, Computer. Science. Dept., Ohio State Univ..
ree...@cis.ohio-state.edu http://www.cis.ohio-state.edu/~reeder/reeder.html
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J Bland
>What is the meaning of the "owner" option for the mount command?
>It shows up on entries for removeable media in my fstab, but
>is not mentioned in the man pages.
Are you sure it shouldn't be 'user' (ie a standard user, as well as root,
can mount the system to the specified mount point as in /etc/fstab with the
options given there)?
AFAIK there *is* no owner option, I can't find any reference to it (which I
generally take as saying it doesn't exist) in the man pages.
Frinky
Douglas A. Taylor
doug reeder <ree...@cis.ohio-state.edu> wrote:
>What is the meaning of the "owner" option for the mount command?
>It shows up on entries for removeable media in my fstab, but
>is not mentioned in the man pages.
Well, in /usr/lib/linuxconf/help.eng/fstab/mountpoint-4.html I
find the piece of information shown below. Are you mounting your
removable media as msdos or vfat partitions? That might explain the
"owner" option.
Hope this helps.
*****
4.1 Security features
Both Ms-DOS and OS/2 are single user operating systems. Their
respective file-systems lack most of the features expected in a
multiuser operating system like Linux.
For one, there is no file ownership. It means that when a DOS hard
drive is mounted into the Linux file-system tree, files will be
available to every user on the machine.
Keep in mind that Linux is a multiuser system. It is fairly easy to
create user accounts on your system for co-workers so they can share
your CPU or system resources. It would be unpleasant to find out later
that everyone has access to every personal file you have in your DOS
partitions.
Linux offers a neat solution to this. You can logically apply an
ownership and permission flag to all files and directories on DOS
partitions. No special data is written to the partitions. It is simply
a presentation mode used by Linux.
Here are the options you can control
* Default user ID You can assign one owner to all files and
directories in the file system. The default owner is root.
* Default group ID You can assign one group to all files and
directories in the file system. The default group is root.
* Default permissions You can selectively turn on or off every one
of the nine Unix style permission bits. Permissions bits are
expressed as three groups or three bits each. Each group has the
following layout
+ Read access
+ Write access
+ Execute access
The groups are
+ Owner permission bits
+ Group permission bits
+ Other users (not the owner and not member of the group)
permission bits.
--
Doug Taylor | Nothing real can be threatened.
The Ohio State University | Nothing unreal exists.
doug-t...@osu.edu | - A Course in Miracles
J Bland
>find the piece of information shown below. Are you mounting your
>removable media as msdos or vfat partitions? That might explain the
>"owner" option.
>
>Hope this helps.
[snip]
>
> Here are the options you can control
>
> * Default user ID You can assign one owner to all files and
> directories in the file system. The default owner is root.
> * Default group ID You can assign one group to all files and
> directories in the file system. The default group is root.
> * Default permissions You can selectively turn on or off every one
> of the nine Unix style permission bits. Permissions bits are
> expressed as three groups or three bits each. Each group has the
[snip]
These are controlled by the uid=value and gid=value options you can pass
when mounting fat partitions. As found in man mount.
I can't outright say 'owner' option doesn't exist but I'm very sure it's a
confusion somewhere with 'user'.
Frinky