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<samba:parameter name="dfree command"
context="S"
type="string"
substitution="1"
xmlns:samba="http://www.samba.org/samba/DTD/samba-doc">
<description>
<para>
The <parameter moreinfo="none">dfree command</parameter> setting should only be used on systems where a
problem occurs with the internal disk space calculations. This has been known to happen with Ultrix, but may
occur with other operating systems. The symptom that was seen was an error of "Abort Retry Ignore"
at the end of each directory listing.
</para>
<para>
This setting allows the replacement of the internal routines to calculate the total disk space and amount
available with an external routine. The example below gives a possible script that might fulfill this
function.
</para>
<para>
In Samba version 3.0.21 this parameter has been changed to be a per-share parameter, and in addition the
parameter <smbconfoption name="dfree cache time"/> was added to allow the output of this script to be cached
for systems under heavy load.
</para>
<para>
The external program will be passed a single parameter indicating a directory in the filesystem being queried.
This will typically consist of the string <filename moreinfo="none">./</filename>. The script should return
two integers in ASCII. The first should be the total disk space in blocks, and the second should be the number
of available blocks. An optional third return value can give the block size in bytes. The default blocksize is
1024 bytes.
</para>
<para>
Note: Your script should <emphasis>NOT</emphasis> be setuid or setgid and should be owned by (and writeable
only by) root!
</para>
<para>
Where the script dfree (which must be made executable) could be:
<programlisting format="linespecific">
#!/bin/sh
df "$1" | tail -1 | awk '{print $(NF-4),$(NF-2)}'
</programlisting>
or perhaps (on Sys V based systems):
<programlisting format="linespecific">
#!/bin/sh
/usr/bin/df -k "$1" | tail -1 | awk '{print $3" "$5}'
</programlisting>
Note that you may have to replace the command names with full path names on some systems.
Also note the arguments passed into the script should be quoted inside the script in case they
contain special characters such as spaces or newlines.
</para>
<para>
By default internal routines for determining the disk capacity and remaining space will be used.
</para>
</description>
<value type="example">/usr/local/samba/bin/dfree</value>
</samba:parameter>
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