df and sub-mounts...

[rsi]

Hello!
Is there any way to get the right free space with df on sub-mounted partitions?
Just to explain...

Main-folder to mount is /opt/myfolder.

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mount /dev/sdb1 /opt/myfolder
mount /dev/sdc1 /opt/myfolder/subfolder
df /opt/myfolder

So, 'df' gives only the free space of /dev/sdb1, but not the free space on /dev/sdc1.
In my opinion is this a wrong behavior of 'df' or there should be an option to force the free space of all mounts in that folder together.

Is there any command-line tool, that gives the correct free space back?

Thank's for help!

[bw123]

I'm not sure what you want to see, but play with some wild cards, and check out the man page for df

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$ df --total /opt/myfolder /opt/myfolder/*

[rsi]

To explain for what I need this, it's for the samba "dfree command" directive, because samba gives only the free size of the first mounted device back, but not the sub-mounted device.
But now, I've written my own shell script to give the correct size back to samba with all sub-mounted devices calculated.
But thank's for the hint with the --total option. This makes it easier in my script. I missed this.
But samba 4.5.x seems still not using the "dfree command" directive.

[dilberts_left_nut]

This gives only the free size of /dev/sdb1, but not the free size of /dev/sdb1 + /dev/sdc1.

Than, you did not read the man page correct or did not understand it.

[rsi]

This gives only the free size of /dev/sdb1, but not the free size of /dev/sdb1 + /dev/sdc1.

Than, you did not read the man page correct or did not understand it.

Not directly, I simply overlooked the "--total" option.