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Groups > linux.kernel > #1274464
| From | Al Viro <viro@ZenIV.linux.org.uk> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [RFC] readlink()-related oddities |
| Date | 2015-11-20 23:40 +0100 |
| Message-ID | <qx2vw-50g-9@gated-at.bofh.it> (permalink) |
| References | <qwGOm-7Dg-15@gated-at.bofh.it> <qwQE2-5uX-5@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
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)) &&
path->dentry->d_inode)
return -EISDIR;
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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[RFC] readlink()-related oddities Al Viro <viro@ZenIV.linux.org.uk> - 2015-11-20 00:30 +0100
Re: [RFC] readlink()-related oddities Linus Torvalds <torvalds@linux-foundation.org> - 2015-11-20 03:20 +0100
Re: [RFC] readlink()-related oddities Al Viro <viro@ZenIV.linux.org.uk> - 2015-11-20 04:00 +0100
Re: [RFC] readlink()-related oddities Linus Torvalds <torvalds@linux-foundation.org> - 2015-11-20 04:10 +0100
Re: [RFC] readlink()-related oddities Linus Torvalds <torvalds@linux-foundation.org> - 2015-11-20 04:20 +0100
Re: [RFC] readlink()-related oddities Al Viro <viro@ZenIV.linux.org.uk> - 2015-11-20 04:30 +0100
Re: [RFC] readlink()-related oddities David Howells <dhowells@redhat.com> - 2015-11-20 11:10 +0100
Re: [RFC] readlink()-related oddities David Howells <dhowells@redhat.com> - 2015-11-20 11:00 +0100
Re: [RFC] readlink()-related oddities Al Viro <viro@ZenIV.linux.org.uk> - 2015-11-20 17:10 +0100
Re: [RFC] readlink()-related oddities David Howells <dhowells@redhat.com> - 2015-11-20 17:30 +0100
Re: [RFC] readlink()-related oddities Al Viro <viro@ZenIV.linux.org.uk> - 2015-11-20 23:40 +0100
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