K 10
svn:author
V 3
mjg
K 8
svn:date
V 27
2019-08-19T14:11:54.673265Z
K 7
svn:log
V 597
vfs: fix up r351193 ("stop always overwriting ->mnt_stat in VFS_STATFS")

fs-specific part of vfs_statfs routines only fill in small portion of the
structure. Previous code was always copying everything at a higher layer to
acoomodate it and this patch does the same.

'df' (no arguments) worked fine because the caller uses mnt_stat itself as the
target buffer, making all the copying a no-op for its own case.
'df /' and similar use a different consumer which passes its own buffer and
this is where you can run into trouble.

Reported by:	cy
Fixes: r351193
Sponsored by:	The FreeBSD Foundation

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