Linux Kernel dentry and inode?

If you have a struct path (or can construct one), look at how tomoyo do this: http://lxr.linux.no/linux+v2.6.37/security/tomoyo/realpath.c#L86.

Take a look at dentry_path(). It will fill a buffer with the path up to the mount's root. To keep going past there, you'll need iterate through your file's f_vfsmount and it's mnt_parents until you reach the real root of the file system.

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