Does linux perform a pumount on shutdown?

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I'm using raspbian debian wheezy. I automatically mount USB drives using usbmount. I mount FAT usb drives with the flush option. Now I was wondering. When I shutdown my pi, does it perform the umount command on all the drives? And does it also perform a sync before unmounting to write the buffers to the usb dirve?

I'm asking this because I couldn't find it and I really don't want to loose any data. Thanks in advance

user3673517

Posted 2014-08-28T10:16:38.133

Reputation: 75

Answers

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Yes, linux has always done an umount on all mounted drives during shutdown. You might even see that it re-mounts some filesystems as read-only to finish the shutdown. Syncing is inherent to umount.

MSalters

Posted 2014-08-28T10:16:38.133

Reputation: 7 587

Okay thank you, but what is the difference between pumount and umount, I thought the pumount does a sync before unmmounting and the umount doesn't. – user3673517 – 2014-08-28T11:21:43.270

I googled it and seems like pumount is just umount for non-superusers. – user3673517 – 2014-08-28T11:38:36.577

Asked: 2014-08-28T10:16:38.133

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Active: 2014-08-28T10:23:03.653