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

[Paul Eggert]

On 05/10/2012 04:04 PM, Nikolaus Rath wrote:
> But why isn't
> it du using statvfs instead of statfs?

m4/fsusage.m4 says why:

Do not use statvfs on systems with GNU libc on Linux, because that function
stats all preceding entries in /proc/mounts, and that makes df hang if even
one of the corresponding file systems is hard-mounted, but not available.
statvfs in GNU libc on Hurd, BeOS, Haiku operates differently: it only makes
a system call.

> I am not quite sure who's to blame here. This is a FUSE file system, and
> there is only a callback handler for statvfs calls (but not statfs).
> Should the FUSE kernel module maybe return st_frsize as st_bsize when
> processing a statfs syscall?

Sounds like it, yes.