[PATCH] SF Bug 1192739

[Eric Sorenson]

I tracked down bug 1192739 to some code in 'df.c' which lumps Linux in 
with AIX, SCO and Cray as lacking a 'f_bavail' member of its statfs 
struct. Linux (at least, all the linuxes I have access to) does have 
f_bavail, so the following patch makes sense.  It also appears to work, 
the relevant -d2 output is

GetDiskUsage(/) = 4251556/22
Free space above 1024000, defining 

Which matches my df output:
/dev/hda2             20161204  14885508   4251556  78% /

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linux-df.patch
Description: Text document