Hi guys(girls),

The problem I encountered really annoyed me so much!
At first, I used "mount|grep sda1" to view whether the block device was mounted or not, it itemized many items about /dev/sda1, like this:
...
/dev/sda1 /mnt/eSata fuseblk rw,user_id=0,group_id=0,default_permissions,allow_other 0 0
/dev/sda1 /home/0common fuseblk rw,user_id=0,group_id=0,default_permissions,allow_other 0 0
/dev/sda1 /tmp/atalk fuseblk rw,user_id=0,group_id=0,default_permissions,allow_other 0 0
/dev/sda1 /tmp/albumcache fuseblk rw,user_id=0,group_id=0,default_permissions,allow_other 0 0
...
So, I performed "umount /dev/sda1" many times to umount the block device, but several items cannot be umounted,
the system prompts device is busy, like this :
umount: /tmp/minidlna: device is busy
So, I used "umount -l /dev/sda1" to lazily umount this device.

Secondly, I tried to mount /dev/sda1 , unfortunately, it always prompt me like this:
mount: /dev/sda1 already mounted or /mnt/ufsd busy
Then I used 'fuser /mnt/ufsd' to view which process accessing to this mount point ,but got nothing.

I want to mount /dev/sda1 to /mnt/ufsd, How can I work out this problem?

Any help and solutions are appreciated! Thank you all!

What is the output of grep sda1 /etc/fstab

normally /dev/sda1 IS THE / partition ( like the windows c:\\ drive )
and is mounted on boot because the operating system is there

The output of grep sda1 /etc/fstab is like this:
bash-3.2# grep sda1 /etc/fstab
#/dev/sda1 / ext3 defaults 1 1

and grep sda1 /etc/mtab output:
bash-3.2# grep sda1 /etc/mtab
/dev/sda1 /mnt/eSata fuseblk rw,user_id=0,group_id=0,default_permissions,allow_other 0 0
/dev/sda1 /home/0common fuseblk rw,user_id=0,group_id=0,default_permissions,allow_other 0 0
....

by the way, the linux I used is embeded linux, So the /dev/sda1 is not used as root partition.

/dev/sda is a scsi disk.

By the way, the linux I used is an embeded linux, its / partition is not /dev/sda1, /dev/sda is an external scsi disk used for testing.

As you can see below, it had been ever mounted on other mount point:

bash-3.2# mount|grep /sda1
/dev/sda1 on /mnt/eSata type fuseblk (rw,user_id=0,group_id=0,default_permissions,allow_other)
/dev/sda1 on /home/0common type fuseblk (rw,user_id=0,group_id=0,default_permissions,allow_other)
/dev/sda1 on /tmp/atalk type fuseblk (rw,user_id=0,group_id=0,default_permissions,allow_other)
.....

This is my process of trying to work this problem

====fisrt step========
bash-3.2# mount|grep sda1
/dev/sda1 on /mnt/eSata type fuseblk (rw,user_id=0,group_id=0,default_permissions,allow_other)
/dev/sda1 on /home/0common type fuseblk (rw,user_id=0,group_id=0,default_permissions,allow_other)
/dev/sda1 on /var/cache/mt-daapd type fuseblk (rw,user_id=0,group_id=0,default_permissions,allow_other)
/dev/sda1 on /tmp/minidlna type fuseblk (rw,user_id=0,group_id=0,default_permissions,allow_other)
====second step========
bash-3.2# umount /mnt/eSata
umount: /mnt/eSata: device is busy
umount: /mnt/eSata: device is busy
====third step=========
bash-3.2# fuser /mnt/eSata
Cannot stat /mnt/eSata: Transport endpoint is not connected
Cannot stat /mnt/eSata: Transport endpoint is not connected
Cannot stat file /proc/2113/fd/7: Transport endpoint is not connected
Cannot stat file /proc/2475/fd/3: Transport endpoint is not connected
Cannot stat file /proc/2475/fd/4: Transport endpoint is not connected
====forth step=========
bash-3.2# ps -ef|grep 2113
apache 2113 1 0 09:30 ? 00:00:00 mt-daapd
root 5213 4143 0 11:36 pts/0 00:00:00 grep 2113

bash-3.2# ps -ef|grep 2475
root 2475 1 0 09:36 ? 00:00:00 /usr/sbin/minidlna -f /etc/miniupnpd/minidlna.conf
root 5234 4143 0 11:36 pts/0 00:00:00 grep 2475

bash-3.2# kill -9 2113
bash-3.2# kill -9 2475

====fifth step=========
bash-3.2# mount |grep sda1
/dev/sda1 on /mnt/eSata type fuseblk (rw,user_id=0,group_id=0,default_permissions,allow_other)
/dev/sda1 on /tmp/minidlna type fuseblk (rw,user_id=0,group_id=0,default_permissions,allow_other)ep
====sixth step=========
bash-3.2# fuser /mnt/eSata
Cannot stat /mnt/eSata: Transport endpoint is not connected
Cannot stat /mnt/eSata: Transport endpoint is not connected
bash-3.2# fuser /tmp/minidlna
Cannot stat /tmp/minidlna: Transport endpoint is not connected
Cannot stat /tmp/minidlna: Transport endpoint is not connected


So I want to know how to work out the problem of 'Transport endpoint is not connected'.

Any help and solutions are appreicated.