Problem kein loop device unter tmpfs möglich

[Pierre Bernhardt]

Hallo,

hier die Steuerzeichenbereinigte Ausgabe des Problems:

Script started on Thu May  9 19:27:37 2002
starflake:/sbin # uname -a
Linux starflake 2.4.18-64GB-SMP #1 SMP Wed Mar 27 13:58:12 UTC 2002 i686 
unknown
starflake:/sbin # cat /etc/SuSE-release
SuSE Linux 8.0 (i386)
VERSION = 8.0
starflake:/sbin # mount
/tmp
tmpfs on /tmp type tmpfs (rw)
starflake:/sbin # grep tmpfs /etc/fstab
tmpfs 
/tmp 
tmpfs 
defaults 0 0
starflake:/sbin # df -k /tmp
Filesystem           1k-blocks      Used Available Use% Mounted on
tmpfs                    63016         0     63016   0% /tmp
starflake:/sbin # ls /tmp
. 
..
starflake:/sbin # mkdir /tmp/test
starflake:/sbin # dd if=/dev/zero of=/tmp/testimage  bs=1k count=10000
10000+0 records in
10000+0 records out
starflake:/sbin # mke2fs -q -F -b 1024 -m 0 -N 7000 /tmp/testimage
mke2fs 1.26 (3-Feb-2002)
starflake:/sbin # tune2fs -i 0 /tmp/testimage
tune2fs 1.26 (3-Feb-2002)
Setting interval between check 0 seconds
starflake:/sbin # mount -oloop /tmp/testimage /tmp/test
ioctl: LOOP_SET_FD: Invalid argument
starflake:/sbin # umount tmpfs
starflake:/sbin # ls /tmp
. 
.ICE-unix 
YaST2-02263 
lilo.conf.test 
targetMap_s
.. 
X11-unix 
YaST2.tdir 
targetMap_e
starflake:/sbin # mount
/dev/hda4 on / type ext3 (rw)
proc on /proc type proc (rw)
devpts on /dev/pts type devpts (rw)
/dev/sr1 on /media/cdchanger type iso9660 (ro,nosuid,nodev)
/dev/sr2 on /media/cdrw0 type iso9660 (ro,nosuid,nodev)
/dev/sr3 on /media/cdrw1 type iso9660 (ro,nosuid,nodev)
/dev/sr4 on /media/dvdrom type iso9660 (ro,nosuid,nodev)
shmfs on /dev/shm type shm (rw)
usbdevfs on /proc/bus/usb type usbdevfs (rw)
starflake:/sbin # df -k /tmp
Filesystem           1k-blocks      Used Available Use% Mounted on
/dev/hda4              6625496   1067196   5221740  17% /
starflake:/sbin # mkdir /tmp/test
starflake:/sbin # dd if=/dev/zero of=/tmp/testimage  bs=1k count=10000
10000+0 records in
10000+0 records out
starflake:/sbin # mke2fs -q -F -b 1024 -m 0 -N 7000 /tmp/testimage
mke2fs 1.26 (3-Feb-2002)
starflake:/sbin # tune2fs -i 0 /tmp/testimage
tune2fs 1.26 (3-Feb-2002)
Setting interval between check 0 seconds
starflake:/sbin # mount -o loop /tmp/testimage /tmp/test
starflake:/sbin # df -k /tmp/test
Filesystem           1k-blocks      Used Available Use% Mounted on
/tmp/testimage            9115        13      9102   1% /tmp/test
starflake:/sbin # exit
exit

Script done on Thu May  9 19:34:43 2002

Kurz Zusammenfassend:
Das mounten eines Extended-2-FS-Image per loop-Device ist nicht
möglich, wenn das Image innerhalb vom tmpfs liegt.

Nicht geprüft sind andere Filesysteme und tiefere Pfade im tmpfs.
Der Mountpoint spielt keine Rolle habe ich nachträglich getestet.

Vielleicht wirft sich ja mal jemand auf dieses Problem.

MfG...
Pierre Bernhardt