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From: Christoph Hellwig <hch@lst.de>
Subject: Re: [GIT PULL] Orangefs (text only resend)
Date: Tue, 8 Sep 2015 16:48:49 +0200
Message-ID: <20150908144849.GA1398@lst.de>
References: <CAOg9mSTuTZk3grmoiMtC7L1WUfPzyav-RW=NXCSfWFhiSZOSFQ@mail.gmail.com> <CA+55aFwE-sVT0CUquKKz8=SR=fomJih51Z44NjqiuwejpNWnuw@mail.gmail.com> <20150906063552.GA7224@lst.de> <20150906090838.GI22011@ZenIV.linux.org.uk> <CAOg9mSQwVuEsZnawEyZ-wwZfrveSkv1hZ8CpbBX8OL9K+vbRmA@mail.gmail.com> <20150906202019.GJ22011@ZenIV.linux.org.uk> <20150907063704.GK22011@ZenIV.linux.org.uk> <CAOg9mSTbuo7Mtv8qqDs9Megm=sG6FnzDu=tSeZq8WLfEN4RZVg@mail.gmail.com> <20150907232206.GL22011@ZenIV.linux.org.uk>
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Cc: Mike Marshall <hubcap@omnibond.com>,
	Christoph Hellwig <hch@lst.de>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	linux-fsdevel <linux-fsdevel@vger.kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Stephen Rothwell <sfr@canb.auug.org.au>,
	Boaz Harrosh <ooo@electrozaur.com>,
	Greg Kroah-Hartman <greg@kroah.com>
To: Al Viro <viro@ZenIV.linux.org.uk>
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On Tue, Sep 08, 2015 at 12:22:06AM +0100, Al Viro wrote:
> You don't want e.g. to have allocation request triggering an attempt to write
> a dirty page on a shared mapping of a file from your fs while you are holding
> a mutex that would block that attempt *and* waiting for a allocation to
> succeed.

Unless something changed very recently there is no writeback in orangefs.
It's all non-cached I/O straight on to the server, with readpage only
there for read-only mmaps (for executable I suspect).