[PATCH v7 0/7] Add O_DENY* support for VFS and CIFS/NFS

Pavel Shilovsky piastry at etersoft.ru
Tue Jan 21 07:31:39 CST 2014

2014/1/20 Volker Lendecke <Volker.Lendecke at sernet.de>:
>> You can try to use O_PATH flag. It doesn't give you a delete access
>> but should be ok because further deleting will be done without file
>> descriptor -- through unlink syscall.
> Ok, I did not know about O_PATH. Thanks for that!
> So I do an open with O_PATH. How do I then make sure that
> nobody else has a O_DENYDELETE set without doing the unlink
> itself?

It's not possible with the current API to do it through open syscall.
Another possibility is to look at /proc/locks. But I think we really
need O_DELETE flag that will force a file to be removed on close - we
will be able to do O_DENYDELETE checks atomically.

Best regards,
Pavel Shilovsky.

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