Messages in this thread | | | Date | Fri, 28 May 2010 20:47:53 +0100 | From | Al Viro <> | Subject | Re: [git pull] vfs pile, part 2 |
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On Fri, May 28, 2010 at 12:27:51PM -0700, Sage Weil wrote: > Hi Al, > > There are two patches > > 1f24668c vfs: make real_lookup do dentry revalidation with i_mutex held > 982ddae4 vfs: clean up do_lookup() > > that were in your for-next a few weeks back but aren't anymore (they're > still in your autofs branch). I just want to make sure those don't get > lost if they're not going to make it upstream this time around? I think > they've been in vfs-2.6.git limbo for two release cycles now.
My apologies, I thought you'd been Cc'd on the discussions with Ian concerning that stuff, but...
The bottom line: "autofs4: always use lookup for lookup" is needed for them and it had to be reverted since it'd been FUBAR.
Details: we really, *really* can not do things in ->d_revalidate() and count on ->lookup() to come and finish them. Think for a minute and you'll see why - between these two calls we allocate a dentry to pass to ->lookup(). What happens if that allocation fails?
And without that patch your stuff breaks autofs4. So it's waiting for the ->d_revalidate() interface redesign. Hopefully in the coming cycle...
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