From: Jamie Lokier <jamie@shareable.org>
To: Christoph Hellwig <hch@infradead.org>
Cc: linux-fsdevel@vger.kernel.org
Subject: Re: O_NONBLOCK for regular files
Date: Thu, 18 Mar 2004 12:05:49 +0000 [thread overview]
Message-ID: <20040318120549.GC29382@mail.shareable.org> (raw)
In-Reply-To: <20040318083628.A25565@infradead.org>
Christoph Hellwig wrote:
> It's used to to allow the HSM support code in XFS (not in the
> kernel.org code due to the horrible design, just in the oss.sgi.com
> tree) to return EAGAIN to the nfs server so it doesn't block all
> nfsd threads on possible long-enduring HSM operations.
How does nfsd get notified when the operation is possible? Does
poll() work?
If poll works that implies a system call returning EAGAIN triggers at
least some part of the HSM operation (whichever part is slow) in the
background -- in which case, isn't the existing AIO interface more
appropriate?
-- Jamie
next prev parent reply other threads:[~2004-03-18 12:06 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-03-18 8:36 O_NONBLOCK for regular files Christoph Hellwig
2004-03-18 8:42 ` viro
2004-03-18 8:45 ` Christoph Hellwig
2004-03-18 10:48 ` Stephen Rothwell
2004-03-18 12:05 ` Jamie Lokier [this message]
-- strict thread matches above, loose matches on Subject: below --
2004-03-20 9:24 Greg Banks
2005-04-13 0:45 ` Greg Banks
2005-04-13 5:56 ` Trond Myklebust
2005-04-13 6:03 ` Greg Banks
2005-04-13 6:31 ` Trond Myklebust
2005-04-13 7:06 ` Greg Banks
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