Re: [RFC] readlink()-related oddities
From: Al Viro
Date: Fri Nov 20 2015 - 17:34:33 EST
On Fri, Nov 20, 2015 at 09:59:05AM +0000, David Howells wrote:
> There's an AFS userspace command that could be used to query a mountpoint that
> was going to use it. However, I suspect readlink() will now always trigger
> the automount.
It won't, actually. All we are passing to user_path_at_empty() is
LOOKUP_EMPTY, so for the final component we'll have
if (!(nd->flags & (LOOKUP_PARENT | LOOKUP_DIRECTORY |
LOOKUP_OPEN | LOOKUP_CREATE | LOOKUP_AUTOMOUNT)) &&
in follow_automount() trigger and follow_managed() will turn that -EISDIR
into 0. IOW, readlink(2) does work on those, same as stat() (since Sep 2011).
Sigh... OK, let's leave it for now; ->open() for those guys is completely
bogus, AFAICS, but that's local bogo^Wbusiness.
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