Messages in this thread |  | | Date | Wed, 10 Feb 2010 13:12:46 +0300 | From | Evgeniy Polyakov <> | Subject | Re: [WTF] ... is going on with current->fs->{root,mnt} accesses in pohmelfs |
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On Wed, Feb 10, 2010 at 10:04:28AM +0000, Al Viro (viro@ZenIV.linux.org.uk) wrote: > a) pohmelfs_construct_path_string() will do interesting things if you > call it while chrooted into jail and pohmelfs mounted deeper in that > jail. Try it.
Should it walk upto mountpoint?
> b) just why do we care about root of chroot jail in pohmelfs_path_length()? > Not to mention anything else, current->fs->root/mnt may be changed under > you if you share current->fs with another thread, but even aside of that, > why does filesystem care about chroot of caller at all? > > What's going on there?
It tries to construct a full path upto mountpoint. Effectively it should do similar to non-exported dentry_path() things. There is a race between getting buffer size and filling with the actual path, but we take care about that by restarting if needed.
-- Evgeniy Polyakov
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