On Fri, Jan 06, 2006 at 03:47:56PM -0600, Michael S. Zick wrote:
> On Fri January 6 2006 14:19, Herbert Poetzl wrote:
> >
> > no, the different taggings work equally well, it's
> > unfortunate that there is no xid aware backup and
> > restore tool, otherwise the transition could be
> > seamless ...
> >
> Herbert,
> Seamless backup and restore of xid between different
> xid marking systems leads me to a dumb question:
>
> Is there a flag or token indicating which tagging
> system is in use? In the inode? In superblock?
no
> In kernel?
yes, the kernel (on 2.x) knows about the tagging
info and exports that information to userspace
(the testfs.sh scripts reports that)
this is the relevant code (bash):
INFO=(`sed 's/.*:\t//' /proc/virtual/info 2>/dev/null || echo '<none>'`)
case ${INFO[2]:1:1} in
0) TAGI="none" ;;
1) TAGI="uid16" ;;
2) TAGI="gid16" ;;
3) TAGI="ugid24" ;;
4) TAGI="intern" ;;
5) TAGI="runtime" ;;
*) TAGI="unknown" ;;
esac
best,
Herbert
> Just point me in the right direction to the appropriate
> source code - I will see if I can figure something out.
> Most likely a tag<->text conversion such as used for
> ACLs.
>
> Mike
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