Remove hard-coded 80 column output

When stdout is detected to be a tty use the number of columns
specified by the terminal.  If that fails fall back to a default
80 column width.  In the non-tty case allow for 999 column lines.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Properly expose the mfu ghost list kstats

Due to a typo the mru ghost lists stats were accidentally being
exposed as the mfu ghost list stats.  This was harmless but
confusing since memory usage could be over reported.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Print human readable error message for ENOENT

A cryptic error code is printed when mounting a legacy dataset to a
non-existent mountpoint. This patch changes this behavior to print
"mount point '%s' does not exist", which is similar to the error
message printed when mounting procfs.

The single quotes were added to be consistent with the existing EBUSY
error message, which is the only difference between this error message
and the one that is printed when the same condition occurs when mounting
procfs.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #633
Make Gentoo initscript use modinfo

The -l parameter to modprobe has been removed from the latest upstream
code and this change has entered Gentoo. Using modinfo as a substitute
addresses this.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #636
Fixed a NULL pointer dereference bug in zfs_preumount

When zpl_fill_super -> zfs_domount fails (e.g. because the dataset
was destroyed before it could be successfully mounted) the subsequent
call to zpl_kill_sb -> zfs_preumount would derefence a NULL pointer.

This bug can be reproduced using this shell script:

 #!/bin/sh
 (
 while true; do
 	zfs create -o mountpoint=legacz tank/bar
 	zfs destroy tank/bar
 done
 ) &

 (
 while true; do
 	mount -t zfs tank/bar /mnt
 	umount /mnt
 done
 ) &

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #639
Export additional dsl symbols

Principly these symbols were exported to get access to the
dsl_prop_register/dsl_prop_unregister functions.  They allow
us to cleanly register a callback which is called when a
dataset property is modified.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Document the zle compression algorithm

Signed-off-by: Richard Laager <rlaager@wiktel.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Improve error message consistency

Signed-off-by: Richard Laager <rlaager@wiktel.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Illumos #1680: zfs vdev_file_io_start: validate vdev before using vdev_tsd

vdev_tsd can be NULL for certain vdev states.
At least in userland testing with ztest.

References to Illumos issue:
  https://www.illumos.org/issues/1680

Ported-by: Richard Yao <ryao@cs.stonybrook.edu>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #655
OS-926: zfs panic in zfs_fill_zplprops_impl()

This change appears to be exclusive to SmartOS. It is not present in
illumos-gate but it just adds some needed error handling.  This is
clearly preferable to simply ASSERTING which is what would occur
prior to the patch.

Reviewed by: Jerry Jelinek <jerry.jelinek@joyent.com>
Reviewed by: Matt Ahrens <matt@delphix.com>
Ported-by: Richard Yao <ryao@cs.stonybrook.edu>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #652
Illumos #1951: leaking a vdev when removing an l2cache device

1952 memory leak when adding a file-based l2arc device
1954 leak in ZFS from metaslab_group_create and zfs_ereport_checksum

Reviewed by: Adam Leventhal <ahl@delphix.com>
Reviewed by: Matt Ahrens <matt@delphix.com>
Reviewed by: Eric Schrock <eric.schrock@delphix.com>
Reviewed by: Bill Pijewski <wdp@joyent.com>
Reviewed by: Dan McDonald <danmcd@nexenta.com>
Approved by: Eric Schrock <eric.schrock@delphix.com>

References to Illumos issues:
  https://www.illumos.org/issues/1951
  https://www.illumos.org/issues/1952
  https://www.illumos.org/issues/1954

Ported-by: Richard Yao <ryao@cs.stonybrook.edu>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #650
Illumos #1475: zfs spill block hold can access invalid spill blkptr

Reviewed by: Dan McDonald <danmcd@nexenta.com>
Reviewed by: Gordon Ross <gwr@nexenta.com>
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Reviewed by: George Wilson <gwilson@zfsmail.com>
Approved by: Garrett D'Amore <garrett@nexenta.com>

References to Illumos issue:
  https://www.illumos.org/issues/1475

Ported-by: Richard Yao <ryao@cs.stonybrook.edu>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #648
Illumos #1346: zfs incremental receive may leave behind temporary clones

1356 zfs dataset prefetch code not working
Reviewed by: Matthew Ahrens <matt@delphix.com>
Reviewed by: Dan McDonald <danmcd@nexenta.com>
Approved by: Gordon Ross <gwr@nexenta.com>

References to Illumos issue:
  https://www.illumos.org/issues/1346
  https://www.illumos.org/issues/1356

Ported-by: Richard Yao <ryao@cs.stonybrook.edu>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #647
ZFS snapshot alias

For consistency, and because it's handy, add the 'zfs snap' alias which
was introduced by Oracle Solaris 11.  This includes an update to the
man page to reflect all the available alias (snap, umount, and recv).

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #640
ZFS list snapshot property alias

Add support for the `zfs list -t snap` alias which is available under
Oracle Solaris 11.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #640
Use KM_PUSHPAGE in l2arc_write_buffers

There is potential for deadlock in the l2arc_feed thread if KM_PUSHPAGE
is not used for the allocations made in l2arc_write_buffers.
Specifically, if KM_PUSHPAGE is not used for these allocations, it is
possible for reclaim to be triggered which can cause the l2arc_feed
thread to deadlock itself on the ARC_mru mutex. An example of this is
demonstrated in the following backtrace of the l2arc_feed thread:

    crash> bt 4123
    PID: 4123   TASK: ffff88062f8c1500  CPU: 6   COMMAND: "l2arc_feed"
      0 [ffff88062511d610] schedule at ffffffff814eeee0
      1 [ffff88062511d6d8] __mutex_lock_slowpath at ffffffff814f057e
      2 [ffff88062511d748] mutex_lock at ffffffff814f041b
      3 [ffff88062511d768] arc_evict at ffffffffa05130ca [zfs]
      4 [ffff88062511d858] arc_adjust at ffffffffa05139a9 [zfs]
      5 [ffff88062511d878] arc_shrink at ffffffffa0513a95 [zfs]
      6 [ffff88062511d898] arc_kmem_reap_now at ffffffffa0513be8 [zfs]
      7 [ffff88062511d8c8] arc_shrinker_func at ffffffffa0513ccc [zfs]
      8 [ffff88062511d8f8] shrink_slab at ffffffff8112a17a
      9 [ffff88062511d958] do_try_to_free_pages at ffffffff8112bfdf
     10 [ffff88062511d9e8] try_to_free_pages at ffffffff8112c3ed
     11 [ffff88062511da98] __alloc_pages_nodemask at ffffffff8112431d
     12 [ffff88062511dbb8] kmem_getpages at ffffffff8115e632
     13 [ffff88062511dbe8] fallback_alloc at ffffffff8115f24a
     14 [ffff88062511dc68] ____cache_alloc_node at ffffffff8115efc9
     15 [ffff88062511dcc8] __kmalloc at ffffffff8115fbf9
     16 [ffff88062511dd18] kmem_alloc_debug at ffffffffa047b8cb [spl]
     17 [ffff88062511dda8] l2arc_feed_thread at ffffffffa0511e71 [zfs]
     18 [ffff88062511dea8] thread_generic_wrapper at ffffffffa047d1a1 [spl]
     19 [ffff88062511dee8] kthread at ffffffff81090a86
     20 [ffff88062511df48] kernel_thread at ffffffff8100c14a

Signed-off-by: Prakash Surya <surya1@llnl.gov>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Illumos #1909: disk sync write perf regression when slog is used post oi_148

Reviewed by: Matt Ahrens <matt@delphix.com>
Reviewed by: Eric Schrock <eric.schrock@delphix.com>
Reviewed by: Robert Mustacchi <rm@joyent.com>
Reviewed by: Bill Pijewski <wdp@joyent.com>
Reviewed by: Richard Elling <richard.elling@richardelling.com>
Reviewed by: Steve Gonczi <gonczi@comcast.net>
Reviewed by: Garrett D'Amore <garrett.damore@gmail.com>
Reviewed by: Dan McDonald <danmcd@nexenta.com>
Reviewed by: Albert Lee <trisk@nexenta.com>
Approved by: Eric Schrock <eric.schrock@delphix.com>

Refererces to Illumos issue:
  https://www.illumos.org/issues/1909

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #680
Illumos #952: separate intent logs should be obvious in 'zpool iostat' output

Reviewed by: Adam Leventhal <ahl@delphix.com>
Reviewed by: Matt Ahrens <mahrens@delphix.com>
Reviewed by: Eric Schrock <eric.schrock@delphix.com>
Reviewed by: Dan McDonald <danmcd@nexenta.com>
Reviewed by: Garrett D'Amore <garrett@nexenta.com>
Approved by: Eric Schrock <eric.schrock@delphix.com>

Refererce to Illumos issue:
  https://www.illumos.org/issues/952

Ported-by: Richard Yao <ryao@cs.stonybrook.edu>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #607
Illumos #1946: incorrect formatting when listing output of multiple pools with zpool iostat -v

Reviewed by: Richard Elling <richard.elling@richardelling.com>
Reviewed by: Joshua M. Clulow <josh@sysmgr.org>
Approved by: Richard Lowe <richlowe@richlowe.net>

Reference to Illumos issue:
  https://www.illumos.org/issues/1946

Ported by: Richard Yao <ryao@cs.stonybrook.edu>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Illumos #2067: uninitialized variables in zfs(1M) may make snapshots undestroyable

Reviewed by: Joshua M. Clulow <josh@sysmgr.org>
Reviewed by: Milan Jurik <milan.jurik@xylab.cz>
Reviewed by: Igor Kozhukhov <ikozhukhov@gmail.com>
Reviewed by: Garrett D'Amore <garrett@damore.org>
Reviewed by: Matt Ahrens <mahrens@delphix.com>
Reviewed by: Steve Gonczi <gonczi@comcast.net>
Approved by: Garrett D'Amore <garrett@damore.org>

References:
	https://www.illumos.org/issues/2067

Ported by: Richard Yao <ryao@cs.stonybrook.edu>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>