Subject: bug#39273: unwanted behavior in the combination of an scenario regarding btrfs, ssh, borg, and 'df' from the core utils

From: Paul Eggert <[email-masked]>
Date: Fri, 24 Jan 2020 13:54:31 -0800

On 1/24/20 11:50 AM, Wismerhill wrote:
> 'df' reports a wrong space calculation

What's wrong about the space calculation?

Please give the 'df' command that you ran, its faulty output, and also 
the output of 'strace' applied to the 'df' command that you ran. For 
example, on my machine, 'strace df' outputs the line:

statfs("/tmp", {f_type=TMPFS_MAGIC, f_bsize=4096, f_blocks=1018122, 
f_bfree=1007348, f_bavail=1007348, f_files=1018122, f_ffree=1018073, 
f_fsid={val=[0, 0]}, f_namelen=255, f_frsize=4096, 
f_flags=ST_VALID|ST_NOSUID|ST_NODEV}) = 0

and those are the numbers that 'df' uses to calculate what it should 
output. If those numbers are wrong, df's output will be wrong but it's 
not df's fault - it's the kernel or btrfs or whatever. If those numbers 
are right but df's output is wrong, then df is at fault.