Theodore Tso <tytso@xxxxxxx> writes:
> On Mar 2, 2011, at 10:24 PM, Al Viro wrote:
>
>> We have an interesting problem. Consider the following sequence
>> of syscalls:
>> mkdir("foo", 0777);
>> mkdir("bar", 0777);
>> fd1 = open("foo", O_DIRECTORY);
>> fd2 = open("bar", O_DIRECTORY);
>> rename("foo", "bar"); /* kill old bar */
>
> I must be missing something. I didn't think you could rename on
> top of a directory and have the directory disappear. Don't you get
> an error in that case?
rename is required to be able to move a directory over an empty
directory, atomically.
> What happens if bar contains files?
That's an error.
Andreas.
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Andreas Schwab, schwab@xxxxxxxxxx
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