Incorrect file size returned in the Respond of "FILE_SUPERSEDE Create"

[Kenny Dinh]

Hi all,

We were running a test in IFSTEST suite called "SupersideFileTest".  The
test expects file size to be 0 after a successful open request, with
FILE_SUPERSEDE disposition, returned.

While handling FILE_SUPERSEDE disposition, SAMBA call vfswrap_ftruncate()
to truncate the file.  However, the file size stored in
fsp->fsp_name->st.st_ex_size was not updated after ftruncate() is called.

As a result, the Create Respond for FILE_SUPERSEDE request contains the
stale file size instead of 0.  The existing code simply returns if
ftruncate() succeeded.  I moved the code such that we always call
vfs_stat_fsp() to update the file size in fsp->fsp_name->st.st_ex_size.

Could someone verify if the attached patch is correct is should be pulled
upstream?

Thanks,
Kenny
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