[stgt] [PATCH 1/1] tgtimg: use posic_fallocate when creating the big files

[ronnie sahlberg]

List, Tomo,

Please find attached a trivial patch for tgtimg.
It changes to use posix_fallocate() when creating raw disk images
instead of using a loop with pwrite().

This makes it less intrusive to the system when creating many large
disk images at the same time.
I did try using posix_fadvise() as an alternative but that did not
work well. (it did not have much effect on the vm trashing)



regards
ronnie sahlberg
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