From: Avi Kivity <avi@scylladb.com>
To: Goldwyn Rodrigues <rgoldwyn@suse.com>,
linux-kernel <linux-kernel@vger.kernel.org>,
linux-xfs@vger.kernel.org
Subject: Detecting RWF_NOWAIT support
Date: Thu, 14 Dec 2017 19:38:34 +0200 [thread overview]
Message-ID: <b45afd09-5fa8-74ac-4ba4-9dc9074e30cf@scylladb.com> (raw)
I'm looking to add support for RWF_NOWAIT within a linux-aio iocb.
Naturally, I need to detect at runtime whether the kernel support
RWF_NOWAIT or not.
The only method I could find was to issue an I/O with RWF_NOWAIT set,
and look for errors. This is somewhat less than perfect:
- from the error, I can't tell whether RWF_NOWAIT was the problem, or
something else. If I enable a number of new features, I have to run
through all combinations to figure out which ones are supported and
which are not.
- RWF_NOWAIT support is per-filesystem, so I can't just remember not
to enable RWF_NOWAIT globally, I have to track it per file.
Did I miss another method of detecting RWF_NOWAIT?
next reply other threads:[~2017-12-14 17:38 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-14 17:38 Avi Kivity [this message]
2017-12-14 19:15 ` Goldwyn Rodrigues
2017-12-16 14:49 ` Avi Kivity
2017-12-16 18:03 ` vcaputo
2017-12-16 18:12 ` vcaputo
2017-12-17 7:09 ` Avi Kivity
2017-12-18 3:28 ` Goldwyn Rodrigues
2017-12-18 7:38 ` Avi Kivity
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