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Date:      Sat, 10 Feb 2018 11:24:31 -0700
From:      Alan Somers <asomers@freebsd.org>
To:        Willem Jan Withagen <wjw@digiware.nl>
Cc:        freebsd current <freebsd-current@freebsd.org>
Subject:   Re: posix_fallocate on ZFS
Message-ID:  <CAOtMX2jZr_kvJgOZWeiB-AZ3-7-uUu%2BUQ3P0nKhGZ0eNRzwMOQ@mail.gmail.com>
In-Reply-To: <1e2f43fd-85da-6629-62d1-6e96790278e5@digiware.nl>
References:  <1e2f43fd-85da-6629-62d1-6e96790278e5@digiware.nl>

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On Sat, Feb 10, 2018 at 10:28 AM, Willem Jan Withagen <wjw@digiware.nl>
wrote:

> Hi,
>
> This has been disabled on ZFS since last November.
> And I do understand the rationale on this.
>
> BUT
>
> I've now upgraded some of my HEAD Ceph test systems and they now fail,
> since Ceph uses posix_fallocate() to allocate space for the
> FileStore-journal.
>
> Is there any expectation that this is going to fixed in any near future?
>
> --WjW
>

No.  It's fundamentally impossible to support posix_fallocate on a COW
filesystem like ZFS.  Ceph should be taught to ignore an EINVAL result,
since the system call is merely advisory.

-Alan



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