Ned Bass bc151f7b31 Remove checks for mandatory locks
The Linux VFS handles mandatory locks generically so we shouldn't
need to check for conflicting locks in zfs_read(), zfs_write(), or
zfs_freesp().  Linux 3.18 removed the lock_may_read() and
lock_may_write() interfaces which we were relying on for this
purpose.  Rather than emulating those interfaces we remove the
redundant checks.

Signed-off-by: Ned Bass <bass6@llnl.gov>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #2804
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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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