Ok i did the first part i.e preallocation using xfsctl() by using
But still is there some way this option could be incorporated in the
fallocate system call.
Smit Shah wrote:
> 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 ??
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