tree 9134730310a6d84ed9de52d9246d5e2e4e044763
parent 357b2e411fe5c03c81817aea9b321e1027f587fe
author Aaron Lu <aaron.lu@intel.com> 1646305986 +0800
committer Wu Fengguang <wfg@mail.ustc.edu.cn> 1646305986 +0800

case-truncate: use cat for sparsefile to consume memory

The intent of "cp sparsefile /dev/null" is to fill page cache with
sparsefile's content, but since cp will recognize the src file
being sparse and skip doing any read of it but just writing zeros to
/dev/null, it kind of failed the purpose.

Fix this by using 'cat sparsefile > /dev/null'.

Signed-off-by: Aaron Lu <aaron.lu@intel.com>