Messages in this thread | | | Date | Tue, 11 Feb 2014 08:03:02 -0800 | From | Christoph Hellwig <> | Subject | O_TMPFILE detection |
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I've started implementing support for O_TMPFILE in xfs_io in preparation for proper testcases and found something rather annoying:
Given that we implicitly pass O_DIRECTORY as part of the full O_TMPFILE flag an open using O_TMPFILE will simply succeed on a kernel old enough to not have O_TMPFILE support, and give you a file descriptor for the directory passed in. Of course this only works if you open the fd read-only which isn't all that useful for real temporary files, but it would be the natural choice for a feature test.
I guess we can't really fix this up any more, but does anyone have a good idea how to document this properly in the man page?
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