Re: [PATCH 0/7] overlay filesystem v9

From: Miklos Szeredi
Date: Fri May 20 2011 - 04:18:36 EST

(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;
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 :(

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