On 11/02/2018 00:10, Alan Somers wrote:
On Sat, Feb 10, 2018 at 3:50 PM, Willem Jan Withagen <w...@digiware.nl
<mailto:w...@digiware.nl>> wrote:
On 10/02/2018 20:43, Ian Lepore wrote:
On Sat, 2018-02-10 at 11:24 -0700, Alan Somers wrote:
On Sat, Feb 10, 2018 at 10:28 AM, Willem Jan Withagen
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
Unfortunately, posix documents that the function returns EINVAL only
due to bad input parameters, so ignoring that seems like a bad idea.
Wouldn't it be better if we returned EOPNOTSUP if that's the actual
situation? That could be safely ignored.
I would probably help in my situation....
And I've been looking at the manpage, but cannot seem to find any
indication that EINVAL is returned on running it on FreeBSD.
It's in the manpage, but only on head. It hasn't been in any stable
release yet.
https://svnweb.freebsd.org/base/head/lib/libc/sys/posix_fallocate.2?revision=325422&view=markup#l112
Right, it is. And it is even in the man-page were I looked. :(
Just plainly read over it.
To be honest I would expect it to have a bit more proza in the header of
the manpage. Because it is rather significant that it does not work on
certain FSes. And not just hide this in a single line in the explanation
of an error value...
--WjW
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