The fchange in zpl_ioctl_setflags was for detecting flag change. However it
was incorrect and would always fail to detect a flag change from set to unset,
causing users without CAP_LINUX_IMMUTABLE to be able to unset flags.
Signed-off-by: Chunwei Chen <david.chen@osnexus.com>
ZFS is an advanced file system and volume manager which was originally
developed for Solaris and is now maintained by the Illumos community.
ZFS on Linux, which is also known as ZoL, is currently feature complete. It
includes fully functional and stable SPA, DMU, ZVOL, and ZPL layers. And it's native!