bug#11406: Bug? df uses f_bsize instead of f_frsize to calculate file system sizes

[Nikolaus Rath]

On 05/11/2012 01:04 PM, Paul Eggert wrote:
> On 05/11/2012 03:42 AM, Jim Meyering wrote:
>> it's not clear that there is even a problem with our
>> current use of statfs on glibc-based Linux systems.
> 
> Yes, I find it curious. GNU/Linux statvfs
> simply invokes statfs internally, right?
> So why should it matter whether df uses statvfs
> or statfs? And yet from Nikolaus Rath's evidence
> it does appear that we have a problem with current FUSE systems.
> 
> In the long run I'd rather have the Linux-based code
> use statvfs, since that's the more-standard interface.
> 
> Nikolaus, does the attached hack fix things for you?
> Basically, it transforms a configure-time test into a
> run-time test. After applying this patch,
> you'll need to run autoreconf + configure before 'make'.

Yes, this works:

With unpatched df:

# df -h ~/tmp/mnt
Filesystem                         Size  Used Avail Use% Mounted on
local:///home/nikratio/tmp/bucket  8.0G  240K  8.0G   1% /home/nikratio/tmp/mnt

With patched df:

# src/df -h ~/tmp/mnt
Filesystem                         Size  Used Avail Use% Mounted on
local:///home/nikratio/tmp/bucket  1.0T   30M  1.0T   1% /home/nikratio/tmp/mnt


Best,

   -Nikolaus

-- 
 »Time flies like an arrow, fruit flies like a Banana.«

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