david@glance.ch (David Mosberger) (09/01/90)
Well, i know that it is impossible to hardlink directories. However, here is a way that you can do the impossible: try to rename a directory on an NFS-mounted filesystem and you will receive the error message: mv: ?? cannot unlink <old directory name> but the new directory does already exist. Both directory entries point to the same inode number, so they are really hardlinked. The tricky part is, to get rid of these directories. Neither `rm' nor `rmdir' work and `fsck' doesn't complain either. Studying the ULTRIX documentation didn't help either---so, do *you* know of a way of deleting a hard-linked directory? Here is a description of the environment in which the described effect is reproducable: System on which the `mv' command was issued: SCO ODT (i386 Unix System V3.2) System accessed by NFS: ULTRIX-32 V3.1 The NFS system was soft mounted (this is probably a wrong for a rw mounted NFS filesystem, on the other side, it is very inconvenient to have an application blocking just because an NFS server was shutdown) and the directory name was much shorter than 14 characters. Any help is appreciated! --dave -- ------------------------------------------------------------------------- David Mosberger Glance Ltd. Software Engineer Gewerbestrasse 4 david@glance.ch 8162 Steinmaur
grr@cbmvax.commodore.com (George Robbins) (09/02/90)
In article <1990Sep1.131832.510@glance.ch> david@elava.UUCP (David Mosberger) writes: > Well, i know that it is impossible to hardlink directories. However, > here is a way that you can do the impossible: try to rename a directory on > an NFS-mounted filesystem and you will receive the error message: normally you'd use unlink(8) where the filesystem is locally mounted, but ultrix seems to be missing this fine utility. You could try writing an idiot program to invoke the unlink(2) system call on the file or give clri(8) a try, followed by an fsck to clean up the mess... -- George Robbins - now working for, uucp: {uunet|pyramid|rutgers}!cbmvax!grr but no way officially representing: domain: grr@cbmvax.commodore.com Commodore, Engineering Department phone: 215-431-9349 (only by moonlite)