On Sat, Aug 24, 2013 at 8:37 PM, Al Viro <viro@xxxxxxxxxxxxxxxxxx> wrote:
>
> FWIW, I'm tempted to try the following trick:
> * introduce FMODE_FLINK in file->f_mode; O_TMPFILE would set it,
> unless O_EXCL is present.
> * introduce LOOKUP_LINK, to be passed by sys_linkat() when
> resolving the target.
[ .. snipped .. ]
Yes. I think we should do this, but I think we should also look at
what _other_ LOOKUP_xyz we should do for the /proc case.
For the read-only fd case, we should have a LOOKUP_WRITE flag, and
return -EPERM if an operation is a write, and we terminate in that
LAST_BIND case.
That would catch the truncate() case, but also the "open a read-only
fd for write or O_TRUNC" case.
Anything else? What other path operations matter that follow links
than truncate(), link() and open()?
Linus
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