[Gluster-devel] fallocate

Emmanuel Dreyfus manu at netbsd.org
Sun Nov 17 00:45:59 UTC 2013

Anand Avati <avati at gluster.org> wrote:

> If you call fallocate() over an existing region with data it shouldn't be
> wiped with 0s. You can also call fallocate() on a hole (in case file was
> ftruncate()ed to a large size) and that region should get "allocated" (i.e
> future write to an fallocated() region should NOT fail with ENOSPC).

It seems it can be emulated, should it be atomic?

> BTW, does NetBSD have the equivalent of open_by_handle[_at]() and
> name_to_handle[_at]() system calls?

That is extended API set 2. With the exception of fexecve(2), I
implemented them in NetBSD-current, which means they will be available
in NetBSD-7.0. Are they also mandatory in glusterfs-3.5? Is they are,
then emulating fallocate() in userland is useless, I would better work
on it in kernel for the next release.

Emmanuel Dreyfus
manu at netbsd.org

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