Re: [uml-devel] filemap feature 2.4.22-5um

[BlaisorBlade <blaisorblade_spam@yahoo.it> (by way of BlaisorBlade <blaisorblade_spam@yahoo.it>)]

Alle 16:08, martedì 14 ottobre 2003, Steve Schmidtke ha scritto:
> Doug Dumitru wrote:
> >A couple of questions.  I noticed that you are not mapping /proc/mm.
>
> [...]
>
> >This looks like one per virtual process (minus threads).  Am I reading
> > this right.
>
> yes. The discussion for a previous patch considered a "mm" table to hold a
> pool of /proc/mm files to handle one fd per process.
> [....]

Nooo! Don't make your like hard!

Search for this thread "[uml-user] chroot'ing an UML - /proc/mm" on
http://marc.theaimsgroup.com/ !
You can use mount --bind inside the host to make /proc/mm visible to UML.
 I.e. it should be something such(NOT TRIED!):

cd <chroot path>
mkdir proc
touch proc/mm #You must create the mount point. In this case it's a file.
(as root)mount --bind /proc/mm proc/mm
<start Uml binary with "# chroot . linux ...." >

About the ugliness, it's only a userspace syntax matter. This is the v2 of
 the umlwrap syntax. Instead of this:
  umlwrap -bind=21,/dev/shm/mconsole1 -dir=/home/uml -- \
  /bin/linux mem=48M uml_dir=/uml/ umid=um1 filemap=22,/uml/um1/pid \
  22</dev/shm/pid filemap=21,/uml/um1/mconsole

We can have this:
  umlwrap -dir=/home/uml -bind=/dev/shm/mconsole1,/uml/um1/mconsole \
  -map=r,/dev/shm/pid,/uml/um1/pid-- /bin/linux mem=48M uml_dir=/uml/
 umid=um1

umlwrap will then setup the needed "filemap" options, at the end of the
command line. However, does UML(unlike vanilla kernel) supports so long(>512
char) command lines in the internal kernel part, (in the userspace part it's
granted)? If not, we can use a patch out there that is already used by
Knoppix.

By the way, if umlwrap is smart enough, maybe it can guess whether to use
-map, -bind or -connect by itself(at least partially, i.e. stating the file).
However this isn't a problem here. And for the length of settings, there is
scripting!

Bye
--
cat <<EOSIGN
Paolo Giarrusso, aka Blaisorblade
Linux Kernel 2.4.21/2.6.0-test on an i686; Linux registered user n. 292729
EOSIGN



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