Bug ID: 6587837 /etc/fs/zfs/mount -m prevents filesystem from being unmounted

Bug ID	6587837
Synopsis	/etc/fs/zfs/mount -m prevents filesystem from being unmounted
State	10-Fix Delivered (Fix available in build)
Category:Subcategory	kernel:zfs
Keywords
Responsible Engineer	Timothy Haley
Reported Against
Duplicate Of
Introduced In	solaris_nevada
Commit to Fix	snv_83
Fixed In	snv_83
Release Fixed	solaris_nevada(snv_83) , solaris_10u6(s10u6_01) (Bug ID:2160996)
Related Bugs
Submit Date	1-August-2007
Last Update Date	13-February-2008
Description	with latest onnv builds, after mounting a zfs filesystem with /etc/fs/zfs/mount -m, there is no ways to umount the filesystem other rebooting the system. This behavior is different from /sbin/mount -m 1) /sbin/mount -m bash-3.00# mkdir /mpt1 bash-3.00# zfs list NAME USED AVAIL REFER MOUNTPOINT foo 138K 262M 18K /foo foo/fs 18K 262M 18K legacy bash-3.00# mount -F zfs -m foo/fs /mpt1 bash-3.00# grep /mpt1 /etc/mnttab bash-3.00# grep /mpt1 /etc/mnttab bash-3.00# echo $? 1 bash-3.00# mkfile 10m /mpt1/f10 bash-3.00# zfs list NAME USED AVAIL REFER MOUNTPOINT foo 10.1M 252M 18K /foo foo/fs 10.0M 252M 10.0M legacy <== the space get changed as expected! bash-3.00# mount -F zfs foo/fs /mpt1 mount failed: Device busy bash-3.00# mkdir /mpt2 bash-3.00# mount -F zfs foo/fs /mpt2 mount failed: Device busy bash-3.00# pwd / bash-3.00# mount -F zfs foo/fs /mpt2 mount failed: Device busy bash-3.00# umount /mpt1 umount: warning: /mpt1 not in mnttab bash-3.00# umount -f /mpt1 umount: warning: /mpt1 not in mnttab umount: /mpt1 not mounted bash-3.00# mount -F zfs foo/fs /mpt2 bash-3.00# echo $? 0 bash-3.00# zfs create -o mountpoint=legacy foo/fs1 bash-3.00# mount -F zfs foo/fs1 /mpt1 bash-3.00# zfs mount foo /foo foo/fs /mpt2 foo/fs1 /mpt1 From the above commands, we can observe that foo/fs can get umounted from /mpt1 and then is mounted to /mpt2 2) /etc/fs/zfs/mount -m bash-3.00# zfs list NAME USED AVAIL REFER MOUNTPOINT foo 183K 262M 18K /foo foo/fs 18K 262M 18K legacy foo/fs1 18K 262M 18K legacy bash-3.00# mkdir /mpt1 /mpt2 bash-3.00# /etc/fs/zfs/mount -m foo/fs /mpt1 bash-3.00# grep /mpt1 /etc/mnttab bash-3.00# echo $? 1 bash-3.00# mkfile 10m /mpt1/f10 bash-3.00# zfs list NAME USED AVAIL REFER MOUNTPOINT foo 10.2M 252M 18K /foo foo/fs 10.0M 252M 10.0M legacy <== space gets changed as expected. foo/fs1 18K 252M 18K legacy bash-3.00# /etc/fs/zfs/mount foo/fs /mpt1 mount failed: Device busy bash-3.00# /etc/fs/zfs/mount foo/fs1 /mpt1 mount failed: Device busy bash-3.00# /etc/fs/zfs/mount foo/fs /mpt2 mount failed: Device busy bash-3.00# pwd / bash-3.00# /etc/fs/zfs/mount foo/fs /mpt2 mount failed: Device busy bash-3.00# /etc/fs/zfs/umount /mpt1 cannot unmount '/mpt1': not currently mounted bash-3.00# /etc/fs/zfs/umount -f /mpt1 cannot unmount '/mpt1': not currently mounted bash-3.00# /etc/fs/zfs/mount foo/fs /mpt2 mount failed: Device busy bash-3.00# /etc/fs/zfs/mount foo/fs /mpt2 mount failed: Device busy bash-3.00# /etc/fs/zfs/mount foo/fs1 /mpt1 mount failed: Device busy bash-3.00# /etc/fs/zfs/mount foo/fs1 /mpt1 mount failed: Device busy bash-3.00# /etc/fs/zfs/mount foo/fs /mpt2 mount failed: Device busy From above output of 2), we can found that /etc/fs/zfs/mount cannot behaved as that of /sbin/mount
Work Around	N/A
Comments	N/A

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