[Bug 9046] New: df reports wrong sizes on some FUSE filesystems

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=9046

            Bug ID: 9046
           Summary: df reports wrong sizes on some FUSE filesystems
           Product: Busybox
           Version: 1.24.x
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P5
         Component: Other
          Assignee: unassigned at busybox.net
          Reporter: ncopa at alpinelinux.org
                CC: busybox-cvs at busybox.net
  Target Milestone: ---

On docker for mac the `df` utility reports wrong sizes due to use of the statfs
f_bsize instead of f_frsize:

OSX reports the following correct sizes:

$ df -h /tmp
Filesystem   Size   Used  Avail Capacity  iused    ifree %iused  Mounted on
/dev/disk1  233Gi  145Gi   88Gi    63% 38064107 22976051   62%   /


While busybox in docker reports on a FUSE mounted filesystem (mapping /tmp on
osx host to /tmp in alpine linux container):

$ docker run --rm -it -v /tmp:/tmp alpine df -h /tmp
Filesystem                Size      Used Available Use% Mounted on
osxfs                    58.2T     36.2T     21.9T  62% /tmp


With coreutils it reports correct size:

$ docker run --rm -it -v /tmp:/tmp alpine sh -c "apk add --no-progress -U
coreutils && df -h /tmp"
...
Filesystem      Size  Used Avail Use% Mounted on
osxfs           233G  145G   88G  63% /tmp

This thread from coreutils discusses the issue:
https://lists.gnu.org/archive/html/bug-coreutils/2012-05/msg00017.html

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