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由 Ján Tomko 提交于
Introduce a new function virFileAllocate that will call the non-destructive variants of safezero, essentially reverting my commit 1390c268 safezero: fall back to writing zeroes even when resizing back to the state as of commit 18f03166 virstoragefile: Have virStorageFileResize use safezero This means that _ALLOCATE flag will no longer work on platforms without the allocate syscalls, but it will not overwrite data either.
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