linux-kernel - Re: [GIT PULL] ocfs2 changes for 2.6.32

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Date:	Thu, 17 Sep 2009 11:40:33 -0700
From:	Roland Dreier <rdreier@...co.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Joel Becker <Joel.Becker@...cle.com>,
	Mark Fasheh <mfasheh@...e.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	ocfs2-devel@....oracle.com
Subject: Re: [GIT PULL] ocfs2 changes for 2.6.32


 >   int copy_file(const char *src, const char *dst)
 >   {
 >	/* Start a file copy */
 >	int cookie = copyfile(src, dst, 0);
 >
 >	/* Async case? */
 >	if (cookie > 0) {
 >		int ret;
 >
 >		while ((ret = copyfile_ctrl(cookie, COPYFILE_WAIT)) > 0)
 >			/* nothing */;
 >
 >		/* Error handling is shared for async/sync */
 >		cookie = ret;
 >	}
 >	if (cookie < 0) {
 >		perror("copyfile failed");
 >		return -1;
 >	}

I guess one bit of semantics to figure out is what happens if copyfile()
does the async case but then copyfile_ctrl() returns an error halfway
through... is the state of the dest file just undefined?

 - R.
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