Bash shell snippet to check if mounted Samba share is not busy

Question

#!/bin/sh

mount -t cifs //192.168.5.90/share -o password='' /mnt/tera_nas

rsync -av --super --delete --recursive /home/ /mnt/tera_nas/home/

# sleep 5m (i want to avoid using this)

# Bash shell snippet to check if mounted Samba share is not busy before issuing umount command

umount /mnt/tera_nas/

Are you asking for us to write the "Bash shell snippet to check if mounted Samba share is not busy before issuing umount command" portion of that script? — Evan Anderson, Jun 24 '09 at 17:13

score 3 · Answer 1 · answered Jun 24 '09 at 17:34

3

you could lsof to see if it has any open file descriptors

answered Jun 24 '09 at 17:34

mog

131
3

Agreed. I'd do lsof -n | grep mountpoint – Matt Simmons Jun 24 '09 at 17:41

score 3 · Answer 2 · answered Jun 24 '09 at 18:17

3

you could use "fuser -m mountpoint" to see if anyone is accessing the path.

answered Jun 24 '09 at 18:17

tomoe

430
2
5

score 3 · Accepted Answer · answered Jun 24 '09 at 22:22

3

I would just lazy unmount it, using the -l flag. This will remove the mount point from the filesystem (so no new operations can start), and will finish the proper unmount once it is no longer busy.

answered Jun 24 '09 at 22:22

wearearobot

56
3

As per http://serverfault.com/users/1293/dennis-williamson: umount -l /mnt/tera_nas Did the trick for me. Thank you. – cgomezsilva Jun 30 '09 at 18:10

score 2 · Answer 4 · answered Jun 24 '09 at 18:12

2

Let umount do the work for you:

while ! $(umount /mnt/tera_nas/ 2>/dev/null)
do
    echo "not yet"
    sleep 5m
done
echo "now it is"

You could shorten the sleep time, but I wouldn't eliminate it. It serves a different role here than in your question.

answered Jun 24 '09 at 18:12

Dennis Williamson

62,149
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score 1 · Answer 5 · edited Apr 13 '17 at 12:14

1

2Dennis Williamson:

I'd rather use

umount -l /mnt/tera_nas

at the end.

edited Apr 13 '17 at 12:14

Community

1

answered Jun 24 '09 at 19:56

Anonymous

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score 1 · Answer 6 · answered Jun 25 '09 at 00:54

Use automount to do this for you automatically, the mountpoint /mnt/tera_nas/home/ will be mounted automatically when it is accessed, then unmounted once it is no longer needed.

# /etc/auto.master
/mnt auto.mnt

# /etc/auto.mnt
tera_nas -t cifs,password='' ://192.168.5.90/share

Then service autofs restart

Bash shell snippet to check if mounted Samba share is not busy

6 Answers6