Messages in this thread | | | Date | Mon, 20 Jan 2014 14:20:43 +0400 | Subject | Re: [PATCH v7 0/7] Add O_DENY* support for VFS and CIFS/NFS | From | Pavel Shilovsky <> |
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2014/1/20 Volker Lendecke <Volker.Lendecke@sernet.de>: > Hi! > > On Fri, Jan 17, 2014 at 02:07:05PM +0400, Pavel Shilovsky wrote: >> If O_DENYDELETE flag is specified and the open succeded, >> any further unlink operation will fail with -ESHAREDENIED >> untill this open is closed. Now this flag is processed by >> VFS and CIFS filesystem. NFS returns -EINVAL for opens >> with this flag. > > This looks really, really good, thanks! > > One question: If Samba wants to open a file for delete > access, there's no corresponding flag in the open > permissions. There can be the case where Samba wants to open > *just* for future unlink, no read or write access required. > Is there a way to achieve this atomically correct?
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.
-- Best regards, Pavel Shilovsky.
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