Document the dedupditto pool property.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #1839
Handle concurrent snapshot automounts failing due to EBUSY.

In the current snapshot automount implementation, it is possible for
multiple mounts to attempted concurrently.  Only one of the mounts will
succeed and the other will fail.  The failed mounts will cause an EREMOTE
to be propagated back to the application.

This commit works around the problem by adding a new exit status,
MOUNT_BUSY to the mount.zfs program which is used when the underlying
mount(2) call returns EBUSY.  The zfs code detects this condition and
treats it as if the mount had succeeded.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #1819
Updating init scripts to have more robust grepping

The previous pattern could accidentally match on things like
'real_root=ZFS=node02-zp00/ROOT/rootfs' due to the 'ZFS=no'
substring.

Signed-off-by: Matthew Thode <mthode@mthode.org>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #1837
Explain 'zfs list -t snap -o name -s name' speedup

Commit 0cee240 from FreeBSD dramatically speeds up 'zfs list'
performance assuming you're only interested in the dataset
names.  This optimization should be mentioned in the man page
to allow end users to take advantage of it.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #1847
pep8 code readability changes

Update the code to follow the pep8 style guide.

References:
  http://www.python.org/dev/peps/pep-0008/

Signed-off-by: Matthew Thode <prometheanfire@gentoo.org>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue #1838
Python 3 fixes

Future proofing for compatibility with newer versions of Python.

Signed-off-by: Matthew Thode <prometheanfire@gentoo.org>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue #1838
Fix rollback of mounted filesystem regression

The Illumos #3875 patch reverted a part of ZoL's 7b3e34b which added
special-case error handling for zfs_rezget().  The error handling dealt
with the case in which an all-ones object number ended up being passed
to dnode_hold() and causing an EINVAL to be returned from zfs_rezget().

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #1859
Closes #1861
Some nvlist allocations in hold processing need to use KM_PUSHPAGE.

Commit 95fd54a1c5b93bb2aa3e7dffc28c784b1e21a8bb restructured the
hold/release processing and moved some of the work into the sync task.
A number of nvlist allocations now need to use KM_PUSHPAGE.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #1852
Closes #1855
Reduce stack for traverse_visitbp() recursion

During pool import stack overflows may still occur due to the
potentially deep recursion of traverse_visitbp().  This is most
likely to occur when additional layers are added to the block
device stack such as DM multipath.  To minimize the stack usage
for this call path the following changes were made:

1) Added the keywork 'noinline' to the vdev_*_map_alloc() functions
   to prevent them from being inlined by gcc.  This reduced the
   stack usage of vdev_raidz_io_start() from 208 to 128 bytes, and
   vdev_mirror_io_start() from 144 to 128 bytes.

2) The 'saved_poolname' charater array in zfsdev_ioctl() was moved
   from the stack to the heap.  This reduced the stack usage of
   zfsdev_ioctl() from 368 to 112 bytes.

3) The major saving came from slimming down traverse_visitbp() from
   from 224 to 144 bytes.  Since this function is called recursively
   the 80 bytes saved per invokation adds up.  The following changes
   were made:

  a) The 'hard' local variable was replaced by a TD_HARD() macro.

  b) The 'pd' local variable was replaced by 'td->td_pfd' references.

  c) The zbookmark_t was moved to the heap.  This does cost us an
     additional memory allocation per recursion by that cost should
     still be minimal.  The cost could be further reduced by adding
     a dedicated zbookmark_t slab cache.

  d) The variable declarations in 'if (BP_GET_LEVEL()) { }' were
     restructured to use the minimum amount of stack.  This includes
     removing the 'cbp' local variable.

Overall for the offending use case roughly 1584 of total stack space
has been saved.  This is enough to avoid overflowing the stack on
stock kernels with 8k stacks.  See #1778 for additional details.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ned Bass <bass6@llnl.gov>
Closes #1778
Fixes (extends) support for selinux xattrs to more inode types

Properly initialize SELinux xattrs for all inode types.  The
initial implementation accidentally only did this for files.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #1832
Tighten zfs dependency on zfs-kmod

Make zfs depend on the same version of zfs-kmod, rather than on same or
better. When yum repository contains a number of versions the dependency
resolution breaks on trying to install non-latest version.

Signed-off-by: Cyril Plisko <cyril.plisko@mountall.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #1677
Remove the slog restriction on bootfs pools

Under Linux this restriction does not apply because we have access
to all the required devices.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #1631