How to get full pathname from an inode?

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Omen.Wildat_private

Another question.  I am trying to build up the full path name of a file
from the inode_permission hook.  I have an inode, how do I get the full
path (including walking over any mount points) from that inode?  The
code I have is this:

   struct dentry *d = list_entry(inode->i_dentry.next, struct dentry, d_alias);
   char *filename = d_path(d, mntget(current->fs->rootmnt), filebuf, PATH_MAX);
   mntput(current->fs->rootmnt);

I swear this /use/ to cross mount points, but does not any more.  I
have /shared as a mount point, and a file under that gets resolved as
'/a.txt' rather than '/shared/a.txt'.

Is that the correct way to get the dentry associated with the inode
that is passed to inode_permission?

Where do I get the global root vfsmount to pass to d_path?
current->fs->rootmnt must not be it.

I have been doing all my testing under UML if it makes any difference.
I am using Debian's UML package, version 2.4.20-6um-1, with LSM version
2.4.20-lsm1 applied.

Thanks,
   Omen

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