The Solaris VFS is flexible enough for a filesystem to support this, but any filesystem that does violates POSIX according to a comment in ZFS. A check of the i

The Solaris VFS is flexible enough for a filesystem to support this, but any filesystem that does violates POSIX according to a comment in ZFS. A check of the illumos UFS driver source code reveals that it violates POSIX by permitting root to do this. I wrote more about this with links to relevant illumos source code here: https://news.ycombinator.com/item?id=43447288 https://news.ycombinator.com/item?id=43447288