(Neil, sorry for the dup)
NeilBrown <neilb@xxxxxxx> writes:
> On Thu, 19 May 2011 19:05:58 +0100 Andy Whitcroft <apw@xxxxxxxxxxxxx> wrote:
>
>> On Thu, May 19, 2011 at 07:44:54PM +0200, Miklos Szeredi wrote:
>> > I'd be happier if the LSM module were fixed not to peek inside the inode
>> > structure. Some filesystems (notably network ones) do not guarantee i_*
>> > to be up-to-date, relying on these is not a good idea.
>>
>> I wonder what what the official way to get ownership information for an
>> inode is if we cannot rely on those. I am happy to get the Yama LSM
>> fixed up if they are doing something wrong.
>>
>> -apw
>
> inode->getattr(...., &kstat);
> look at kstat.uid, kstat.gid.
Yeah, it should probably do something like:
if (inode->i_op->getattr) {
struct kstat stat;
inode->i_op->getattr(...)
uid = stat.uid;
} else {
uid = inode->i_uid;
}
The problem is that getattr takes a vfsmount, which makes this
impossible to do cleanly. And the solution is for ->getattr() to lose
that argument, which is a bit more involved :(
Thanks,
Miklos
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