On 06/01/2017 10:14 AM, Anton Nefedov wrote: > Current write_zeroes implementation is good enough to satisfy this flag too > > Signed-off-by: Anton Nefedov <anton.nefe...@virtuozzo.com> > --- > block/file-posix.c | 9 ++++++++- > 1 file changed, 8 insertions(+), 1 deletion(-)
Are we sure that fallocate() is always fast, or are there some file systems where it is no faster than manually writing zeroes? I'm worried that blindly claiming BDRV_REQ_ALLOCATE may fail if we encounter a libc or kernel-based fallback that takes a slow patch on our behalf. -- Eric Blake, Principal Software Engineer Red Hat, Inc. +1-919-301-3266 Virtualization: qemu.org | libvirt.org
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