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[linux-lvm] can't snap a mounted (reiserfs|ext3) with kernel 2.2.x



I need to unmount the lvm partition before i can realize a valid
snapshot of a journalized fs (reiserfs or ext)
All works fine with ext2 :

mount -t ext3 /dev/vg0/ext3fs	=>ok
lvreate snap /dev/vg0/ext3fs	=> ok
mount snap  	=> FAILED
	mount: block device /dev/vg0/snap is write-protected, mounting
read-only
	mount: wrong fs type, bad option, bad superblock on /dev/vg0/snap,
	       or too many mounted file systems

umount /dev/vg0/ext3fs	=>ok
lvreate snap /dev/vg0/ext3fs	=> ok
mount snap  	=> ok

mount -t ext2 /dev/vg0/ext2fs	=>ok
lvreate snap /dev/vg0/ext2fs	=> ok
mount snap  	=> ok


Redhat 6.2 on IBM Netfinity
kernel used: 2.2.19, 2.2.20, 2.2.21
patches: reiserfs-3.5.35, 
	ext3-0.0.7a
	linux-2.2.18-rawio.patch, 
	linux-2.2.19.kdb.diff, 
	linux-2.2.19.ext3.diff
LVM: 1.0.3, 1.0.4, 1.0.5 patches and utils


I known there was a patch for kernel 2.4.x for VFS-lock but nothing for
kenel 2.2.x series.

I can't upgrade to kernel 2.4. What can i do ?



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