Suppermount patch

satimis · 08-12-2005, 11:01 PM

Hi folks,

LFS 6.1
Host FC3
Kernel-Linux version 2.6.12-1.1372_FC3

During building LFS 6.1 after chroot and Populating /dev
http://www.linuxfromscratch.org/lfs/...6/devices.html

I can't umout /mnt/lfs. Each time exited chroot and ran;
# umount /dev (saying busy)
# umount /dev/pts (saying busy)
# umount /dev/shm (no printout)

umount -a $LFS

Code:

umount: /mnt/lfs: device is busy
umount: /var/lib/nfs/rpc_pipefs: device is busy
umount: /home: device is busy
umount: /: device is busy

# umount /mnt/lfs

Code:

umount: /mnt/lfs: device is busy
umount: /mnt/lfs: device is busy

Any folk on the forum tried the supermount patch
Kernel patch homepage of Con Kolivas
http://members.optusnet.com.au/ckolivas/kernel/

Whether it can fix my probem. If YES whether the captioned patch works on this FC3 kernel. TIA

B.R.
satimis

kjordan · 08-14-2005, 12:11 AM

Do you have /mnt/lfs open, either in a file navigator or in the console? If so, get out of /mnt/lfs before unmounting.

freegianghu · 08-14-2005, 12:25 AM

You should umount before chroot:

Code:

# umount /dev/pts
# umount /dev/shm
# umount /dev

And after chroot:

Code:

# umount $LFS/dev/shm
# umount $LFS/dev/pts
# umount $LFS/dev

# umount $LFS/proc
# umount $LFS/sys

# umount $LFS

satimis · 08-14-2005, 04:50 AM

Hi freegianghu and kjordan,

Tks for your advice.

Now I got my problem solved. As freegianghu mentioned;

Must run following commands before 'exit' chroot;
# umount /dev/pts
# umount /dev/shm
# umount /dev

Then after 'exit' chroot "umount /mnt/lfs" worked without problem/printout

Previously I made a mistake running them after exiting chroot environment, always complaining "device not mounted"

Quote:

And after chroot:

Code:

# umount $LFS/dev/shm
# umount $LFS/dev/pts
# umount $LFS/dev

# umount $LFS/proc
# umount $LFS/sys

# umount $LFS

I tried again. Entered chroot environment and ran;
# umount /dev/pts
# umount /dev/shm
# umount /dev
All no printout

Exited chroot and then ran;
# umount $LFS/dev/shm

Code:

umount: /mnt/lfs/dev/shm: not found

]# umount $LFS/dev/pt

Code:

umount: /mnt/lfs/dev/pts: not found

# umount $LFS/dev

Code:

umount: /mnt/lfs/dev: not mounted

# umount $LFS/proc

Code:

umount: /mnt/lfs/proc: not mounted

# umount $LFS/sys

Code:

umount: /mnt/lfs/sys: not mounted

# umount /mnt/lfs
No printout.

Would it be they are not necessary?

B.R.
satimis

freegianghu · 08-14-2005, 05:12 AM

Quote:

6.2. Mounting Virtual Kernel File Systems

Various file systems exported by the kernel are used to communicate to and from the kernel itself. These file systems are virtual in that no disk space is used for them. The content of the file systems resides in memory.

Begin by creating directories onto which the file systems will be mounted:

Code:

mkdir -p $LFS/{proc,sys}

Now mount the file systems:

Code:

mount -t proc proc $LFS/proc
mount -t sysfs sysfs $LFS/sys

Remember that if for any reason you stop working on the LFS system and start again later, it is important to check that these file systems are mounted again before entering the chroot environment.

Additional file systems will soon be mounted from within the chroot environment. To keep the host up to date, perform a �fake mount� for each of these now:

Code:

mount -f -t tmpfs tmpfs $LFS/dev
mount -f -t tmpfs tmpfs $LFS/dev/shm
mount -f -t devpts -o gid=4,mode=620 devpts $LFS/dev/pts