Dan McDonald 460a021391 Log zvol truncate/discard operations
As the comments in zvol_discard() suggested, the discard operation
could be logged to the zil.  This is a port of the relevant code from
Nexenta as it was added in "701 UNMAP support for COMSTAR" and has been
attributed to the author of that commit.

References:
  https://github.com/Nexenta/illumos-nexenta/commit/b77b923
  https://github.com/zfsonlinux/zfs/blob/089fa91b/module/zfs/zvol.c#L637

Ported-by: Tim Chase <tim@chase2k.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
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Native ZFS for Linux!

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.

Full documentation for installing ZoL on your favorite Linux distribution can be found at: http://zfsonlinux.org

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