Re: [PATCH] vfs: new O_NODE open flag

Andreas Dilger
2009-09-28T15:21:57Z

On Sep 28, 2009 12:25 +0200, Miklos Szeredi wrote:
> BTW I just checked, and it is possible to re-open or promote an fd
> opened with O_NODE like this:
>
> char tmp[64];
>
> fd = open(filename, O_NODE | O_NOACCESS);
> /* ... */
> sprintf(tmp, "/proc/self/fd/%i", fd);
> fd_rw = open(tmp, O_RDWR);
>
> Now fd_rw is guaranteed to refer to the same inode as fd.

It seems very unpleasant to require applications using O_NODE to
reopen files using /proc.

Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.