Re: [PATCH v3] ocfs2: Let ocfs2_setattr use new truncate sequence.

From: Tao Ma
Date: Thu Jun 10 2010 - 20:01:33 EST

Joel Becker wrote:
On Thu, Jun 10, 2010 at 08:09:36PM +0800, Tao Ma wrote:
Joel Becker wrote:
Is your concern that the u/gid checks may be against stale ids?
So I think we should have one inode_change_ok before the cluster
lock and another after the cluster lock.
The first one will save us a lot of cluster lock effort if the user
pass us the wrong arguments while the later
one will test again with the refreshed inode info.

But what if the other node has given us permission, and then we
fail? Say the file was owned by you. On node 2, root sets it to be
owned by me. Then on node 1, I go to change the file permissions.
inode_change_ok() will fail, because the in-memory inode still thinks
you are the owner.
I guess it does need to be under the lock.
OK, so I will revise my patch to move it under cluster lock.


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