lkml.org 
[lkml]   [2007]   [Apr]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [Devel] Re: [patch 05/10] add "permit user mounts in new namespace" clone flag
From
Date
On Wed, 2007-04-18 at 16:03 +0200, Miklos Szeredi wrote:
> > Don't forget that almost all mount flags are per-superblock. How are you
> > planning on dealing with the case that one user mounts a filesystem
> > read-only, while another is trying to mount the same one read-write?
>
> Yeah, I forgot, the per-mount read-only patches are not yet in.
>
> That doesn't really change my agrument though. _If_ the flag is per
> mount, then it makes sense to be able to change it on a master and not
> on a slave. If mount flags are propagated, this is not possible.

Read-only isn't the only issue. On something like NFS, there are flags
to set the security flavour, turn on/off encryption etc.

If I mount your home directory using no encryption in my namespace, for
instance, then neither you nor the administrator will be able to turn it
on afterwards in yours without first unmounting it from mine so that the
superblock is destroyed.

Cheers
Trond

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2007-04-18 16:39    [W:0.084 / U:0.368 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site