XFS Preallocate using ALLOCSP

[Smit Shah]

Hi, 

I wanted to preallocate the file using the ALLOCSP so that the preallocated
space is zeroed out. Hence i used the xfsctl but the problem is that i
cannot execute  it as a non-root user.  So i tried using fallocate but when
i saw the xfs implementation of kernel it uses the RESVP cmd and  since the
unwritten flag is set i am assuming that the performance of writing to the
preallocated space will suffer because of the metadata updates. So is there
a way to preallocate using ALLOCSP as a non-root user or else i would be
required to modify the kernel ??

TIA, 
Smit 
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